Automatic photovoltaic inspection equipment

Abstract

The utility model discloses automatic photovoltaic inspection equipment, and belongs to the technical field of photovoltaic inspection. The device comprises a moving mechanism which comprises a lead screw, a moving plate and a base; the lead screw is rotationally mounted on the base, and the movable plate is in threaded connection with the lead screw; the lightning arrester group comprises a plurality of lightning arresters to be detected; the lightning arrester is installed on the base and located on one side of the lead screw. The inclination detection mechanism is mounted on the movable plate; the inclination detection mechanism is used for carrying out inclination detection on the lightning arrester; the tightening mechanism is mounted on the moving plate; the tightening mechanism comprises a telescopic mechanism and a tightening unit connected with the telescopic mechanism, and the tightening unit is used for tightening a nut fixing connecting line of the lightning arrester. The automatic inspection system can automatically inspect, saves manpower, and avoids casualties.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic inspection, in particular to an automatic photovoltaic inspection device. Background Art

[0002] Photovoltaic power generation system (photovoltaic power station) is composed of solar cell array, battery pack, charge and discharge controller, inverter, AC power distribution cabinet and solar tracking control system. In order to ensure the normal operation of photovoltaic power station, it is necessary to conduct regular inspection of photovoltaic power station. The inspection of photovoltaic power station mainly includes inspection of photovoltaic plant area (components, brackets, bridges, cables), inspection of inverter, inspection of combiner box, inspection of lightning arrester, inspection of high-voltage grid-connected switch equipment, inspection of DC power supply equipment, inspection of cable trench, etc.

[0003] When it is necessary to inspect the photovoltaic power station, the lightning arrester needs to be inspected. The lightning arrester inspection needs to detect whether the line installed on the lightning arrester is firm, whether the lightning arrester is firmly fixed, whether the lightning arrester is tilted, and whether the lightning arrester is damaged;

[0004] The Chinese National Utility Model Patent with the publication number of CN116317939A discloses a photovoltaic power station inspection device and inspection method, which belongs to the field of photovoltaic power generation, including a fixed substrate, a zinc oxide lightning arrester is fixedly connected to the upper surface of the fixed substrate, a grounding wire is sleeved at the middle position of the bottom of the zinc oxide lightning arrester, and a grounding bolt is provided between the zinc oxide lightning arrester and the grounding wire and fixed by the grounding bolt; and also includes a looseness detection mechanism, which is arranged inside the flat space formed by the fixed substrate and the zinc oxide lightning arrester, and is used to detect the looseness of the grounding bolt connected between the zinc oxide lightning arrester and the grounding wire;

[0005] The above-mentioned device needs manual inspection and cannot be performed automatically. Manual inspection requires a large amount of manpower, and when the lightning arrester is installed at a high position, workers need to use ladders to perform high-altitude operations. Improper operation during the high-altitude operation can easily cause casualties. Utility Model Content

[0006] The utility model aims to provide a highly efficient automatic photovoltaic inspection device.

[0007] In order to solve the above technical problems, the utility model provides an automated photovoltaic inspection device, comprising:

[0008] The moving mechanism comprises a lead screw, a moving plate and a base; the lead screw is rotatably mounted on the base, and the moving plate is threadedly connected to the lead screw;

[0009] A lightning arrester group, comprising a plurality of lightning arresters to be tested; the lightning arresters are mounted on a base and located on one side of the lead screw;

[0010] A tilt detection mechanism, which is mounted on the moving plate; the tilt detection mechanism is used to perform tilt detection on the arrester;

[0011] A tightening mechanism is mounted on a movable plate; the tightening mechanism comprises a telescopic mechanism and a tightening unit connected to the telescopic mechanism, and the tightening unit is used to tighten the nut of the arrester to fix the connecting wire.

[0012] Preferably, the base includes a rear baffle, a front storage plate and two vertical plates symmetrically arranged at intervals;

[0013] The vertical plates are provided with through holes, and the lead screw passes through the through holes of the two vertical plates;

[0014] The rear baffle is installed on the rear side of the tops of the two vertical plates, and the movable plate abuts against the rear baffle;

[0015] The front panel is mounted on the front side of the tops of the two vertical panels, and the lightning arrester is mounted on the front panel;

[0016] The tilt detection mechanism is located between the lightning arrester and the rear baffle.

[0017] Preferably, the number of the tightening units is two;

[0018] The two tightening units are respectively located on the upper and lower sides of the moving plate.

[0019] Preferably, the tightening unit comprises a tightening plate, a sleeve and a clamping wrench;

[0020] The tightening plate is fixedly connected to the cylinder of the telescopic mechanism;

[0021] The sleeve is mounted on the tightening plate;

[0022] Two rotatable sleeve plates are mounted on the sleeve;

[0023] The two sleeves are connected to a prestressed mechanism, and the prestressed mechanism is used to drive the two sleeves to rotate in opposite directions;

[0024] A pushing assembly is installed on each sleeve plate, the clamping wrench is fixedly connected to the cylinder of the pushing assembly, the clamping wrench is located on the inner side of the sleeve plate, and the pushing assembly is used to push the clamping wrench to fix the nut on the arrester.

[0025] Preferably, two sides of the main gear of the prestressed mechanism are respectively meshed with two auxiliary gears, and the two auxiliary gears are respectively meshed with two sleeve plates.

[0026] Preferably, each sleeve plate is provided with two clamping wrenches and a pushing assembly which are arranged opposite to each other.

[0027] Preferably, the tilt detection mechanism comprises a detection barrel, a detection drive assembly and a plurality of detection plates;

[0028] The detection drive assembly is mounted on the mobile plate;

[0029] The cylinder of the detection drive assembly is fixedly connected to the detection barrel;

[0030] The detection barrel is provided with a detection circuit, a plurality of elastic components and a plurality of detection parts;

[0031] One end of the detection plate is located outside the detection barrel, and the other end extends into the detection barrel;

[0032] The elastic component is fixedly connected to the detection plate;

[0033] The detection element is mounted on the detection plate;

[0034] The detection circuit is provided with a plurality of detection notches corresponding to the detection pieces;

[0035] The detection circuit is connected to the power supply and the signal transmitter respectively.

[0036] Preferably, the detection notches correspond to the detection pieces one by one;

[0037] Each corresponding detection notch is located on the same straight line as the detection piece.

[0038] Preferably, the power supply and the signal transmitter are both installed on the rear baffle.

[0039] Preferably, the sleeve plate is a hollow ring;

[0040] The detection element and the detection circuit are both metal strips.

[0041] Compared with the prior art, the beneficial effects of the utility model are:

[0042] The utility model tightens the nut of the lightning arrester through the tightening mechanism, and tightens the loose connection wires in the two nuts; the utility model can also detect the inclination of the lightning arrester through the inclination detection mechanism, and it can be known whether the lightning arrester is inclined and needs maintenance; the utility model automatically performs inspections, saves manpower, and avoids casualties. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings.

[0044] Figure 1 This is a structural schematic diagram of an automated photovoltaic inspection device of the utility model;

[0045] Figure 2 It is a structural diagram of the mobile mechanism;

[0046] Figure 3It is a structural schematic diagram of the tightening mechanism;

[0047] Figure 4 is a structural schematic diagram of a tightening unit;

[0048] Figure 5 It is a structural schematic diagram of the tilt detection mechanism.

[0049] In the figure: 1-moving mechanism; 11-screw; 12-moving plate; 13-base; 131-vertical plate; 132-rear baffle; 133-front plate; 2-lightning arrester group; 21-lightning arrester; 3-tilt detection mechanism; 31-detection barrel; 311-detection circuit; 312-elastic component; 313-detection piece; 314-detection gap; 32-detection drive component; 33-detection plate; 4-tightening mechanism; 41-telescopic mechanism; 5-tightening unit; 51-tightening plate; 52-sleeve; 53-clamping wrench; 521-sleeve plate; 522-prestressed mechanism; 523-main gear; 524-secondary gear; 54-pushing component; 53-clamping wrench; 6-nut; 7-power supply; 8-signal transmitter; 9-connecting line. DETAILED DESCRIPTION

[0050] Many specific details are described in the following description to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific implementation disclosed below.

[0051] The terms used in one or more embodiments of this specification are only for the purpose of describing specific embodiments, and are not intended to limit one or more embodiments of this specification. The singular forms of "a", "said" and "the" used in one or more embodiments of this specification and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used in one or more embodiments of this specification refers to and includes any or all possible combinations of one or more associated listed items.

[0052] It should be understood that although the terms first, second, etc. may be used to describe various information in one or more embodiments of this specification, this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of one or more embodiments of this specification, the first may also be referred to as the second, and similarly, the second may also be referred to as the first. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0053] The utility model is further described in detail below in conjunction with the accompanying drawings:

[0054] like Figure 1 As shown, the utility model provides an automated photovoltaic inspection device, comprising:

[0055] The moving mechanism 1 comprises a lead screw 11, a moving plate 12 and a base 13; the lead screw 11 is rotatably mounted on the base 13, and the moving plate 12 is threadedly connected to the lead screw 11;

[0056] The lightning arrester group 2 includes a plurality of lightning arresters 21 to be tested; the lightning arresters 21 are mounted on the base 13 and are located on one side of the lead screw 11;

[0057] A tilt detection mechanism 3, which is mounted on the moving plate 12; the tilt detection mechanism 3 is used to perform tilt detection on the arrester 21;

[0058] The tightening mechanism 4 is mounted on the movable plate 12 ; the tightening mechanism 4 comprises a telescopic mechanism 41 and a tightening unit 5 connected to the telescopic mechanism 41 , and the tightening unit 5 is used to tighten the nut 6 of the arrester 21 to fix the connecting wire 9 .

[0059] Preferably, the base 13 includes a rear baffle 132, a front storage plate 133 and two vertical plates 131 that are symmetrically arranged at intervals;

[0060] The vertical plates 131 are provided with through holes, and the lead screw 11 passes through the through holes of the two vertical plates 131;

[0061] The rear baffle 132 is installed on the rear side of the top of the two vertical plates 131, and the movable plate 12 abuts against the rear baffle 132;

[0062] The front plate 133 is mounted on the front side of the tops of the two vertical plates 131, and the lightning arrester 21 is mounted on the front plate 133;

[0063] The tilt detection mechanism 3 is located between the lightning arrester 21 and the rear baffle 132 .

[0064] Preferably, the number of the tightening units 5 is two;

[0065] The two tightening units 5 are respectively located on the upper and lower sides of the moving plate 12 .

[0066] Preferably, the tightening unit 5 comprises a tightening plate 51, a sleeve 52 and a clamping wrench 53;

[0067] The tightening plate 51 is fixedly connected to the cylinder of the telescopic mechanism 41;

[0068] The sleeve 52 is mounted on the tightening plate 51;

[0069] The sleeve 52 is provided with two rotatable sleeve plates 521;

[0070] The two sleeve plates 521 are both connected to a prestressed mechanism 522, and the prestressed mechanism 522 is used to drive the two sleeve plates 521 to rotate in opposite directions;

[0071] A pushing assembly 54 is installed on each of the sleeve plates 521 , the clamping wrench 53 is fixedly connected to the cylinder of the pushing assembly 54 , the clamping wrench 53 is located on the inner side of the sleeve plate 521 , and the pushing assembly 54 is used to push the clamping wrench 53 to fix the nut 6 on the arrester 21 .

[0072] Preferably, two sides of the main gear 523 of the prestressing mechanism 522 are respectively engaged with two auxiliary gears 524 , and the two auxiliary gears are respectively engaged with two sleeve plates 521 .

[0073] Preferably, each sleeve plate 521 is mounted with two clamping wrenches 53 and a pushing assembly 54 that are arranged opposite to each other.

[0074] Preferably, the tilt detection mechanism 3 includes a detection barrel 31, a detection drive assembly 32 and a plurality of detection plates 33;

[0075] The detection drive assembly 32 is mounted on the moving plate 12;

[0076] The cylinder of the detection drive assembly 32 is fixedly connected to the detection barrel 31;

[0077] The detection barrel 31 is provided with a detection circuit 311, a plurality of elastic components 312 and a plurality of detection members 313;

[0078] One end of the detection plate 33 is located outside the detection barrel 31, and the other end extends into the detection barrel 31;

[0079] The elastic component 312 is fixedly connected to the detection plate 33;

[0080] The detection member 313 is mounted on the detection plate 33;

[0081] The detection circuit 311 is provided with a plurality of detection notches 314 corresponding to the detection members 313;

[0082] The detection circuit 311 is connected to the power supply 7 and the signal transmitter 8 respectively.

[0083] Preferably, the detection notch 314 corresponds to the detection member 313 one by one;

[0084] Each corresponding detection notch 314 is located on the same straight line as the detection member 313 .

[0085] Preferably, the power supply 7 and the signal transmitter 8 are both installed on the rear baffle 132 .

[0086] Preferably, the sleeve plate 521 is a hollow ring;

[0087] The detection element 313 and the detection circuit 311 are both metal strips.

[0088] In order to better illustrate the technical effect of the present invention, the present invention provides the following specific embodiments to illustrate the above technical process:

[0089] Embodiment 1: An automated photovoltaic inspection device, comprising:

[0090] 1. Mobile mechanism 1

[0091] like Figure 2 As shown, the motor drives the lead screw 11 to rotate, and then drives the tightening mechanism 4 and the tilt detection mechanism 3 to move, thereby adjusting the detection position, and then detecting the arrester 21 at different positions;

[0092] 2. Tightening mechanism 4

[0093] like Figure 3 , 4 As shown, the cylinder drives the tightening mechanism 4 to move, and then moves the tightening mechanism 4 to the specified position, the clamping spanner 53 is located in the middle of the nut 6, the cylinder of the clamping spanner 53 extends to push the clamping spanner 53 to move, and then makes the clamping spanner 53 contact with the nut 6, clamping the nut 6, the motor installed on the sleeve 52 of the tightening mechanism 4 drives the prestressing mechanism 522 to rotate, thereby driving the long gear to rotate, and then driving the auxiliary gear 524 set on both sides of the main gear 523 to rotate, and then driving the two sleeve plates 521 to rotate in opposite directions, and then driving the clamping spanner 53 to rotate, and then driving the two upper nuts 6 to move in opposite directions, and then tightening the loosened connecting wire 9;

[0094] The motor installed on the sleeve 52 of the lower tightening mechanism 4 drives the prestressing mechanism 522 to rotate, and then drives the gear to rotate, thereby driving the sleeve plate 521 to rotate in the same direction, and then drives the clamping wrench 53 to rotate, thereby driving the nut 6 to rotate, so that the loosened thread can be tightened, and the two nuts can be tightened, and then the loose connection wire 9 in the two nuts can be tightened;

[0095] 3. Tilt detection mechanism 3

[0096] like Figure 5As shown, the cylinder installed under the detection barrel 31 drives the detection barrel 31 to move, thereby driving the metal strip to move, and the movement of the detection barrel 31 drives the detection plate 33 to move. After the bottom detection plate 33 contacts the bottom protrusion of the lightning arrester 21, the protrusion pushes the detection plate 33 to move, and then drives the metal strip (detection member 313) installed on the side of the detection plate 33 to move, so that the detection member 313 moves to the detection gap 314 at the bottom of the metal strip (detection circuit 311), fills the detection gap 314, and then it and the detection plate 33 contact the lightning arrester 21 respectively, and then gradually fills the detection gap 314, and then the detection circuit 311 can be energized, and the circuit flows out from the power supply 7, through the detection circuit 311, and flows into the signal transmitter 8, so that the signal transmitter 8 sends a signal, and the receiver in the studio receives the signal. The staff can judge whether the lightning arrester 21 is tilted by the signal;

[0097] The detection piece 313 has a certain length. When the detection plate 33 that first contacts the lightning arrester 21 moves to the specified position, the detection piece 313 loses contact with the detection circuit 311. If other detection pieces 313 contact the detection circuit 311 at this time, the detection gap 314 of the detection circuit 311 is completely filled, the circuit cannot be turned on, and no signal is sent. At this time, the staff can know that the lightning arrester 21 is tilted and needs to be repaired.

[0098] The use process of an automated photovoltaic inspection device in this embodiment is as follows:

[0099] like Figure 1 As shown, when it is necessary to inspect the photoelectric drill, the present device is used to inspect the arrester 21, the motor drives the lead screw 11 to rotate, and then drives the tightening mechanism 4 and the tilt detection mechanism 3 to move, so as to adjust the detection position, and then detect the arrester 21 at different positions, when it moves to the specified position, the cylinder drives the tightening mechanism 4 to move, and then moves the tightening mechanism 4 to the specified position, the clamping wrench 53 is in the middle position of the nut 6, the cylinder of the clamping wrench 53 extends to push the clamping wrench 53 to move, and then makes the clamping wrench 53 contact with the nut 6, and then makes the clamping wrench clamp the thread, the motor installed on the sleeve 52 of the upper tightening mechanism 4 drives the prestressing mechanism 522 to rotate, thereby driving the main gear 523 to rotate, and then drives the secondary gear 524 set on the side of the main gear 523 to rotate, and then drives the sleeve plate 521 to rotate in the opposite direction, and then drives the clamping wrench 53 to rotate, and then drives the two upper nuts 6 to move in the opposite direction, and then tightens the loosened connecting line 9;

[0100] The motor installed on the sleeve 52 of the lower tightening mechanism 4 drives the prestressing mechanism 522 to rotate, and then drives the gear to rotate, thereby driving the sleeve plate 521 to rotate in the same direction, and then drives the clamping wrench 53 to rotate, thereby driving the nut 6 to rotate, so that the loosened thread can be tightened, and the two nuts can be tightened, and then the loose connection wire 9 in the two nuts can be tightened;

[0101] At this time, the cylinder installed on the clamping wrench 53 moves back, and then drives the clamping wrench 53 to move in the opposite direction, so that the clamping wrench 53 is out of contact with the nut 6, and the motor reverses to drive other mechanisms to reset, and then the cylinder installed on the tightening mechanism 4 pushes the clamping mechanism to reset;

[0102] Then, the cylinder installed under the detection barrel 31 drives the detection barrel 31 to move, thereby driving the metal strip to move. The movement of the detection barrel 31 drives the detection plate 33 to move. After the lowest detection plate 33 contacts the lowest protrusion of the lightning arrester 21, the protrusion pushes the detection plate 33 to move, and then drives the metal strip (detection member 313) installed on the side of the detection plate 33 to move. The detection member 313 moves to the detection gap 314 at the bottom of the metal strip (detection circuit 311), fills the detection gap 314, and then it and the detection plate 33 contact the lightning arrester 21 respectively, and then gradually fills the detection gap 314, and then the detection circuit 311 can be energized, and the circuit flows out from the power supply 7, through the detection circuit 311, and flows into the signal transmitter 8, so that the signal transmitter 8 sends a signal, and the receiver in the studio receives the signal. The staff can judge whether the lightning arrester 21 is tilted by the signal;

[0103] The detection member 313 has a certain length. When the detection plate 33 that first contacts the lightning arrester 21 moves to a specified position, the detection member 313 is out of contact with the detection circuit 311. If other detection members 313 are in contact with the detection circuit 311 at this time, the detection gap 314 of the detection circuit 311 is completely filled, the circuit cannot be turned on, and then no signal is sent. At this time, the staff can know that the lightning arrester 21 is tilted and needs to be repaired.

[0104] When the detection is completed, the moving mechanism 1 drives the tightening mechanism 4 and the tilt detection mechanism 3 to move, thereby detecting the next lightning arrester 21;

[0105] During the working process, the camera installed on the tightening sleeve 52 detects the appearance of the lightning arrester 21 to detect whether the lightning arrester 21 is broken.

[0106] The above is only a specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An automated photovoltaic inspection device, characterized in that: include: A moving mechanism (1) comprises a lead screw (11), a moving plate (12) and a base (13); the lead screw (11) is rotatably mounted on the base (13), and the moving plate (12) is threadedly connected to the lead screw (11); A lightning arrester group (2), comprising a plurality of lightning arresters (21) to be tested; the lightning arresters (21) are mounted on a base (13) and are located on one side of the lead screw (11); A tilt detection mechanism (3) mounted on the movable plate (12); the tilt detection mechanism (3) is used to detect the tilt of the lightning arrester (21); A tightening mechanism (4) is mounted on a movable plate (12); the tightening mechanism (4) comprises a telescopic mechanism (41) and a tightening unit (5) connected to the telescopic mechanism (41); the tightening unit (5) is used to tighten a nut (6) of a lightning arrester (21) to fix a connecting wire (9).

2. The automated photovoltaic inspection equipment according to claim 1, characterized in that: The base (13) comprises a rear baffle (132), a front storage plate (133), and two vertical plates (131) that are symmetrically arranged at intervals; The vertical plates (131) are provided with through holes, and the lead screw (11) passes through the through holes of the two vertical plates (131); The rear baffle (132) is installed on the rear side of the top of the two vertical plates (131), and the movable plate (12) is in contact with the rear baffle (132); The front plate (133) is installed on the front side of the tops of the two vertical plates (131), and the lightning arrester (21) is installed on the front plate (133); The tilt detection mechanism (3) is located between the lightning arrester (21) and the rear baffle (132).

3. The automated photovoltaic inspection equipment according to claim 2, characterized in that: The number of the tightening units (5) is two; The two tightening units (5) are respectively located on the upper and lower sides of the moving plate (12).

4. The automated photovoltaic inspection equipment according to claim 3, characterized in that: The tightening unit (5) comprises a tightening plate (51), a sleeve (52) and a clamping wrench (53); The tightening plate (51) is fixedly connected to the cylinder of the telescopic mechanism (41); The sleeve (52) is mounted on the tightening plate (51); Two rotatable sleeve plates (521) are mounted on the sleeve (52); The two sleeve plates (521) are both connected to a prestressed mechanism (522), and the prestressed mechanism (522) is used to drive the two sleeve plates (521) to rotate in opposite directions; A pushing assembly (54) is installed on each sleeve plate (521), the clamping wrench (53) is fixedly connected to the cylinder of the pushing assembly (54), the clamping wrench (53) is located on the inner side of the sleeve plate (521), and the pushing assembly (54) is used to push the clamping wrench (53) to fix the nut (6) on the lightning arrester (21).

5. The automated photovoltaic inspection equipment according to claim 4, characterized in that: The two sides of the main gear (523) of the prestressed mechanism (522) are respectively engaged with two auxiliary gears (524), and the two auxiliary gears are respectively engaged with the two sleeve plates (521).

6. The automated photovoltaic inspection equipment according to claim 5, characterized in that: Two clamping wrenches (53) and a pushing assembly (54) arranged opposite to each other are installed on each sleeve plate (521).

7. The automated photovoltaic inspection equipment according to claim 6, characterized in that: The tilt detection mechanism (3) comprises a detection barrel (31), a detection drive assembly (32) and a plurality of detection plates (33); The detection drive assembly (32) is mounted on the moving plate (12); The cylinder of the detection drive assembly (32) is fixedly connected to the detection barrel (31); The detection barrel (31) is provided with a detection circuit (311), a plurality of elastic components (312) and a plurality of detection elements (313); One end of the detection plate (33) is located outside the detection barrel (31), and the other end extends into the detection barrel (31); The elastic component (312) is fixedly connected to the detection plate (33); The detection element (313) is mounted on the detection plate (33); The detection circuit (311) is provided with a plurality of detection notches (314) corresponding to the detection elements (313); The detection circuit (311) is connected to the power supply (7) and the signal transmitter (8) respectively.

8. The automated photovoltaic inspection equipment according to claim 7, characterized in that: The detection notch (314) corresponds to the detection element (313) one by one; Each corresponding detection notch (314) is located on the same straight line as the detection member (313).

9. The automated photovoltaic inspection device according to claim 8, characterized in that: The power source (7) and the signal transmitter (8) are both installed on the rear baffle (132).

10. The automated photovoltaic inspection equipment according to claim 9, characterized in that: The sleeve plate (521) is in the shape of a hollow ring; The detection element (313) and the detection circuit (311) are both metal strips.

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