Cantilever beam type electric field sensor based on piezoelectric ceramics

Abstract

A piezoelectric ceramic-based cantilever beam type electric field sensor disclosed by the present invention comprises a sensor assembly, the sensor assembly comprises a metal cantilever beam, a shell and a wire, the metal cantilever beam is located at the inner side of the shell, and the wire is arranged at one end of the metal cantilever beam; the wiring assembly is arranged on one side of the shell and comprises a fixed frame, a wiring board, a wiring piece, fastening pieces, a trigger plate, a trigger piece and a wire breaking piece, the fixed frame is fixed on one side of the shell, the wiring board is arranged in the fixed frame, the wiring piece is fixed on one side of the wiring board, the fastening pieces are arranged on the two sides of the wiring board, and the trigger piece is arranged on the two sides of the wiring board. The trigger plate slides on the two sides of the fixing frame, the trigger piece is arranged on the inner side of the trigger plate, and the wire breaking piece is arranged in the wire connecting piece. Through the arrangement of the wiring assembly, the disassembly and assembly efficiency of the wire is higher, the connection of the sensor wire is conveniently disconnected in an emergency state, and the sensor wire is prevented from being damaged.

Description

Technical Field

[0001] This invention relates to the field of electric field sensor technology, and in particular to a cantilever beam electric field sensor based on piezoelectric ceramics. Background Technology

[0002] With the development of smart grids and the energy internet, large-scale real-time voltage / electric field monitoring has become an urgent need for power systems. This relies on the large-scale deployment of advanced sensors. Electric field measurement is of great significance in power systems. On the one hand, voltage inversion based on electric field measurement can realize non-contact measurement of high voltage, replacing traditional high-voltage transformers, thereby reducing the insulation cost and installation difficulty of measurement equipment. On the other hand, electric field measurement can also be applied to applications such as equipment fault diagnosis, lightning warning, and electromagnetic environment measurement. Traditional electric field measurement equipment, such as field mills, is often large in size and costly, and cannot be deployed flexibly on a large scale. Therefore, cantilever beam DC electric field sensors based on piezoelectric ceramics have been widely used. They are designed with a double cantilever structure. The cantilever generates displacement and strain under the drive of piezoelectric ceramics, and generates measurable signals through the capacitance changes on the plates. They have the advantages of small size, low cost, low power consumption, and easy mass production.

[0003] In existing piezoelectric ceramic-based cantilever beam DC electric field sensors, the tail wires are usually directly connected to the sensor probe. With frequent wiring and disconnection, the wires are prone to loosening or breaking, causing great inconvenience to the experimental process. In addition, when the sensor needs to be disconnected in an emergency, each wire needs to be removed individually, which is inefficient and can easily cause damage to the sensor probe due to failure to disconnect in time in an emergency. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] In view of the problems existing in the above and / or existing piezoelectric ceramic-based cantilever beam electric field sensors, the present invention is proposed.

[0006] Therefore, the problem that this invention aims to solve is that in the use of existing piezoelectric ceramic-based cantilever beam DC electric field sensors, the wires at the tail end are generally directly connected to the sensor probe. Under frequent wiring and disconnection operations, the wires are prone to loosening or breaking, which brings great inconvenience to the experimental process. At the same time, when it is necessary to disconnect the sensor in an emergency, each wire needs to be removed individually, which is inefficient and can easily cause damage to the sensor probe due to failure to disconnect in time in an emergency.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a cantilever beam electric field sensor based on piezoelectric ceramics, comprising: a sensor assembly including a metal cantilever beam, a housing, and wires, wherein the metal cantilever beam is located inside the housing, and the wires are disposed at one end of the metal cantilever beam; and a wiring assembly disposed on one side of the housing, comprising a fixing frame, a wiring plate, a wiring component, fasteners, a trigger plate, a trigger element, and a wire breaker, wherein the fixing frame is fixed to one side of the housing, the wiring plate is disposed within the fixing frame, the wiring component is fixed to one side of the wiring plate, the fasteners are disposed on both sides of the wiring plate, the trigger plate slides on both sides of the fixing frame, the trigger element is disposed inside the trigger plate, and the wire breaker is disposed inside the wiring component.

[0008] As a preferred embodiment of the piezoelectric ceramic-based cantilever beam electric field sensor of the present invention, the wiring component includes a baffle, a conductive block and a fixing ring, the baffle is fixed inside the fixing frame, the conductive block is fixed inside the baffle, the fixing ring is fixed outside the wiring plate, and the wire is located inside the fixing ring.

[0009] As a preferred embodiment of the piezoelectric ceramic-based cantilever beam electric field sensor of the present invention, the wiring component further includes a terminal block, a movable plate, a first spring, and a fixed plate. The terminal block slides within the fixed ring, the movable plate is fixed to one end of the terminal block, the first spring is fixed to one side of the movable plate, the fixed plate is fixed to the end of the first spring and slides within the fixed ring, and the wire is fixed to the fixed plate.

[0010] As a preferred embodiment of the piezoelectric ceramic-based cantilever beam electric field sensor of the present invention, the fastener includes an anti-error plate, a push plate, a plug rod, and a second spring. The anti-error plate is fixed to the top of one side of the baffle. A groove is provided on the wiring plate to cooperate with it. Track grooves are provided on both sides of the groove. The push plate slides in the track groove. The plug rod slides on both sides of the wiring plate. A plug hole is provided on the inner side of the fixing frame to cooperate with it. The two ends of the second spring are fixed to the plug rod and the push plate, respectively.

[0011] As a preferred embodiment of the piezoelectric ceramic-based cantilever beam electric field sensor of the present invention, the fastener further includes a fourth spring and a limiting rod. The two ends of the fourth spring are respectively fixed to the push plate and the inner wall of the track groove, and the limiting rod is fixed to the inner wall of the track groove and cooperates with the push plate.

[0012] As a preferred embodiment of the piezoelectric ceramic-based cantilever beam electric field sensor of the present invention, the fastener further includes a side plate, a push rod, a fixing block, and a fifth spring. The top and bottom of the fixing frame are provided with through holes. The side plate slides in the through holes. The push rod is fixed to the top and bottom of one side of the trigger plate. The side plate is provided with a groove that matches it. The fixing block is fixed in the through holes. The two ends of the fifth spring are fixed to the fixing block and the side plate, respectively.

[0013] As a preferred embodiment of the piezoelectric ceramic-based cantilever beam electric field sensor of the present invention, the triggering element includes a trigger rod and a sixth spring. The trigger rod is fixed to the inner side of the trigger plate and slides in the insertion hole. The two ends of the sixth spring are respectively fixed to the trigger plate and the fixing frame.

[0014] As a preferred embodiment of the piezoelectric ceramic-based cantilever beam electric field sensor of the present invention, the trigger further includes a mounting block, which is fixed to the top and bottom of the fixing frame, and a sliding groove is provided on the trigger plate, wherein the mounting block slides in the sliding groove.

[0015] As a preferred embodiment of the piezoelectric ceramic-based cantilever beam electric field sensor of the present invention, the broken wire component includes a crossbar, a connecting plate, and a reset rod. The crossbar slides within the fixed ring and is located at the top and bottom of one side of the movable plate. The connecting plate is fixed to both ends of the two movable plates. The reset rod is fixed to one side of the trigger plate and cooperates with the connecting plate.

[0016] As a preferred embodiment of the piezoelectric ceramic-based cantilever beam electric field sensor of the present invention, the broken wire component further includes a protrusion fixed to the surface of the crossbar.

[0017] The beneficial effects of this invention are as follows: By setting up the wiring components, this invention makes the disassembly and assembly of wires more efficient and facilitates disconnection of the sensor wires in emergency situations, thus preventing damage. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the 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: Figure 1 This is a structural diagram of a cantilever beam electric field sensor based on piezoelectric ceramics.

[0019] Figure 2This is a structural diagram of a metal cantilever beam for a piezoelectric ceramic-based cantilever beam electric field sensor.

[0020] Figure 3 This is a structural diagram of the wiring assembly for a piezoelectric ceramic-based cantilever beam electric field sensor.

[0021] Figure 4 This is a cross-sectional view of the wiring assembly of a piezoelectric ceramic-based cantilever beam electric field sensor.

[0022] Figure 5 This is a side view of the wiring assembly of a piezoelectric ceramic-based cantilever beam electric field sensor.

[0023] Figure 6 Another view of the wiring assembly for a piezoelectric ceramic-based cantilever beam electric field sensor.

[0024] Figure 7 This is a three-dimensional view of the wiring assembly of a piezoelectric ceramic-based cantilever beam electric field sensor. Detailed Implementation

[0025] 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.

[0026] 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.

[0027] 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.

[0028] Example 1 Reference Figure 1 and Figure 2 This is the first embodiment of the present invention. This embodiment provides a cantilever beam electric field sensor based on piezoelectric ceramics. The cantilever beam electric field sensor based on piezoelectric ceramics includes a sensor assembly 1 and a wiring assembly 2. The wiring assembly 2 can improve the wiring efficiency of the sensor assembly 1 during use, and at the same time improve the stability of the wire connection.

[0029] Specifically, the sensor assembly 1 includes a metal cantilever beam 11, a housing 12, and a wire 13. The metal cantilever beam 11 is located inside the housing 12, and the wire 13 is disposed at one end of the metal cantilever beam 11.

[0030] Two identical piezoelectric ceramics are fixed on both sides of the metal cantilever beam 11. When the piezoelectric ceramics are energized, they will vibrate, thereby causing the metal cantilever beam 11 to vibrate. There are 3-5 wires 13, which are set according to the actual experimental environment on site. The working principle of this part is existing technology, which can be clearly understood by those skilled in the art, and will not be described in detail here.

[0031] Wiring assembly 2, located on one side of housing 12, includes a fixing frame 21, a wiring board 22, a wiring component 23, a fastener 24, a trigger plate 25, a trigger component 26, and a wire break component 27. The fixing frame 21 is fixed to one side of housing 12, the wiring board 22 is located inside the fixing frame 21, the wiring component 23 is fixed to one side of the wiring board 22, the fastener 24 is located on both sides of the wiring board 22, the trigger plate 25 slides on both sides of the fixing frame 21, the trigger component 26 is located inside the trigger plate 25, and the wire break component 27 is located inside the wiring component 23.

[0032] The fixing frame 21 is used to place the terminal block 22, making its installation more convenient and stable. The wiring component 23 can fix the wire 13. Then, the terminal block 22 is fixed in the fixing frame 21 by the fastener 24, thus completing the connection of the wire 13. The terminal block 22 can be removed with one click by the setting of the trigger plate 25 and the trigger component 26, improving its ease of use. At the same time, the wire disconnection component 27 can quickly cut off the connection between the wire 13 and the sensor, avoiding prolonged connection under fault conditions when a fault occurs, which could cause significant damage to the sensor.

[0033] Example 2 Reference Figures 1-7 This is the second embodiment of the present invention, which is based on the previous embodiment.

[0034] Specifically, the connector 23 includes a baffle 231, a conductive block 232, and a fixing ring 233. The baffle 231 is fixed inside the fixing frame 21, the conductive block 232 is fixed inside the baffle 231, the fixing ring 233 is fixed outside the connector 22, and the wire 13 is located inside the fixing ring 233.

[0035] The number of conductive blocks 232 is the same as that of wires 13. One side of the conductive block is connected to the wires 13, and the other side is connected to the corresponding position of the metal cantilever beam 11 through another wire. The wires in this part are embedded in the outer shell 12, so the stability is higher and there is no need for frequent pulling and disassembly, thus avoiding loosening or falling off. The fixing ring 233 is used to install the wires 13.

[0036] The connector 23 also includes a terminal 234, a movable plate 235, a first spring 236, and a fixed plate 237. The terminal 234 slides within the fixed ring 233, the movable plate 235 is fixed to one end of the terminal 234, the first spring 236 is fixed to one side of the movable plate 235, the fixed plate 237 is fixed to the end of the first spring 236 and slides within the fixed ring 233, and the wire 13 is fixed to the fixed plate 237.

[0037] The terminal 234 and the movable plate 235 are pushed by the first spring 236, which gives them the force to move towards the conductive block 232, so that they can make more stable contact with the conductive block 232, thereby making the connection more stable. The fixed plate 237 is fixed to the wire 13, and the two can be connected by screws or other means to improve the stability of the connection. The terminal 234, the movable plate 235, the first spring 236 and the fixed plate 237 are all made of conductive materials. The specific material selection and working principle are existing technologies and will not be described in detail here.

[0038] The fastener 24 includes an anti-misalignment plate 241, a push plate 242, a plug rod 243, and a second spring 244. The anti-misalignment plate 241 is fixed to the top of one side of the baffle 231. A groove S is provided on the wiring plate 22 to cooperate with it. Track grooves P are provided on both sides of the groove S. The push plate 242 slides in the track groove P. The plug rod 243 slides on both sides of the wiring plate 22. A plug hole K is provided on the inner side of the fixing frame 21 to cooperate with it. The two ends of the second spring 244 are fixed to the plug rod 243 and the push plate 242 respectively.

[0039] The error prevention plate 241 is rectangular and is used to prevent the terminal block 22 from shifting or misaligning when it is inserted into the fixing frame 21. That is, when the terminal block 22 is inserted into the fixing frame 21, it can only be installed in place when the error prevention plate 241 is inserted into the groove S, so as to avoid the misalignment of the wire 13 connection.

[0040] The push plate 242 is L-shaped. When installing the terminal block 22, it is inserted into the fixing frame 21. At this time, the anti-misalignment plate 241 is inserted into the groove S and pushes the two push plates 242 to move outward. The push plates 242 apply a pushing force to the second spring 244 until the plug rod 243 is in the direction of the socket K. At this time, the second spring 244 pushes the plug rod 243 into the socket K, and the terminal block 22 can be fixed by the plug rod 243. The plug rod 243 does not contact the push plate 242. In the initial state, the second spring 244 is in a relaxed state. In this state, the second spring 244 does not apply a pushing force to the plug rod 243. The plug rod 243 is located in the track groove P, thereby preventing it from extending and affecting the installation of the terminal block 22.

[0041] The fastener 24 also includes a fourth spring 245 and a limiting rod 246. The two ends of the fourth spring 245 are fixed to the push plate 242 and the inner wall of the track groove P, respectively. The limiting rod 246 is fixed to the inner wall of the track groove P and cooperates with the push plate 242.

[0042] The fourth spring 245 applies a reset force to the push plate 242. When the anti-misalignment plate 241 is disengaged from the groove S, the fourth spring 245 pushes the push plate 242 to reset, facilitating its subsequent use. The limit rod 246 is used to limit the push plate 242 to prevent it from deviating during left and right movement.

[0043] Fastener 24 also includes side plate 247, push rod 248, fixing block 249 and fifth spring 250. The top and bottom of the fixing frame 21 are provided with through holes V. The side plate 247 slides in the through hole V. The push rod 248 is fixed to the top and bottom of one side of the trigger plate 25. The side plate 247 is provided with a slanted groove M that matches it. The fixing block 249 is fixed in the through hole V. The two ends of the fifth spring 250 are fixed to the fixing block 249 and the side plate 247 respectively.

[0044] At least four side plates 247 are provided, symmetrically distributed on the inner wall of the fixed frame 21. The bottom of the outer side is chamfered. When the terminal block 22 is installed in the fixed frame 21, the terminal block 22 first pushes the side plate 247 into the through hole V until the terminal block 22 moves to the other side of the side plate 247. At this time, the fifth spring 250 pushes the side plate 247 to move towards the terminal block 22, thereby squeezing and fixing the terminal block 22, further improving its stability after installation.

[0045] When it is necessary to remove the terminal block 22, manually press the trigger plate 25. The trigger plate 25 drives the push rod 248 to move. The end of the push rod 248 moves in the inclined groove M and drives the side plate 247 to move into the through hole V, thereby separating the side plate 247 from the terminal block 22 and releasing its limiting effect.

[0046] Limiting blocks are fixed on both sides of the side plate 247 and slide inside the through hole V to limit the side plate 247 and prevent it from detaching from the through hole V.

[0047] The trigger 26 includes a trigger rod 261 and a sixth spring 262. The trigger rod 261 is fixed to the inner side of the trigger plate 25 and slides in the insertion hole K. The two ends of the sixth spring 262 are fixed to the trigger plate 25 and the fixing frame 21, respectively.

[0048] The number of trigger rods 261 corresponds to the number of plug rods 243. When it is necessary to remove the terminal block 22, manually press the trigger plate 25. The trigger plate 25 drives the trigger rods 261 to move into the socket K, thereby pushing the plug rods 243 into the track groove P until they are separated from the socket K. At the same time, the side plate 247 is separated from the terminal block 22. At this time, the terminal block 22 can be removed, which makes the disassembly and assembly more efficient.

[0049] The sixth spring 262 applies a force to the trigger plate 25 in a direction away from the fixed frame 21, making it easier to reset.

[0050] The trigger 26 also includes a mounting block 263, which is fixed to the top and bottom of the fixing frame 21. The trigger plate 25 has a sliding groove Y, and the mounting block 263 slides in the sliding groove Y.

[0051] Mounting block 263 and slide Y can limit the trigger plate 25 to prevent it from shifting during left and right movement.

[0052] The wire break component 27 includes a crossbar 271, a connecting plate 272, and a reset rod 273. The crossbar 271 slides within the fixed ring 233 and is located at the top and bottom of one side of the movable plate 235. The connecting plate 272 is fixed to both ends of the two movable plates 235. The reset rod 273 is fixed to one side of the trigger plate 25 and cooperates with the connecting plate 272.

[0053] Two crossbars 271 are provided, symmetrically distributed within the fixing ring 233. Rectangular slots for the crossbars 271 to move are provided on both sides of the fixing ring 233. The outer side of the connecting plate 272 is chamfered. In case of an emergency requiring disconnection of the wire 13 from the sensor, the two trigger plates 25 can be manually pressed, and the connecting plate 272 and the crossbars 271 can be moved outward by the reset rod 273. At this time, the crossbars 271 drive the terminal 234 and the movable plate 235 away from the conductive block 232, which can be quickly separated. Compared with the existing technology that requires removing wires one by one, this invention can quickly disconnect the connection by disconnecting all wires with one click, avoiding the situation where the sensor is damaged due to excessive failure time.

[0054] The wire break member 27 also includes a protrusion 274, which is fixed to the surface of the crossbar 271.

[0055] The crossbar 271 is limited by the protrusion 274 to prevent it from rotating or moving laterally during movement, which would affect its use.

[0056] 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 cantilever beam electric field sensor based on piezoelectric ceramics, characterized in that: include, The sensor assembly (1) includes a metal cantilever beam (11), a housing (12), and a wire (13), wherein the metal cantilever beam (11) is located inside the housing (12), and the wire (13) is disposed at one end of the metal cantilever beam (11); and, The wiring assembly (2) is disposed on one side of the housing (12) and includes a fixing frame (21), a wiring board (22), a wiring component (23), a fastener (24), a trigger plate (25), a trigger component (26), and a wire break component (27). The fixing frame (21) is fixed to one side of the housing (12), the wiring board (22) is disposed inside the fixing frame (21), the wiring component (23) is fixed to one side of the wiring board (22), the fastener (24) is disposed on both sides of the wiring board (22), the trigger plate (25) slides on both sides of the fixing frame (21), the trigger component (26) is disposed inside the trigger plate (25), and the wire break component (27) is disposed inside the wiring component (23).

2. The cantilever beam electric field sensor based on piezoelectric ceramics as described in claim 1, characterized in that: The connector (23) includes a baffle (231), a conductive block (232), and a fixing ring (233). The baffle (231) is fixed inside the fixing frame (21), the conductive block (232) is fixed inside the baffle (231), the fixing ring (233) is fixed outside the connector (22), and the wire (13) is located inside the fixing ring (233).

3. The cantilever beam electric field sensor based on piezoelectric ceramics as described in claim 2, characterized in that: The connector (23) further includes a terminal (234), a movable plate (235), a first spring (236), and a fixed plate (237). The terminal (234) slides within the fixed ring (233). The movable plate (235) is fixed to one end of the terminal (234). The first spring (236) is fixed to one side of the movable plate (235). The fixed plate (237) is fixed to the end of the first spring (236) and slides within the fixed ring (233). The wire (13) is fixed to the fixed plate (237).

4. The cantilever beam electric field sensor based on piezoelectric ceramics as described in claim 3, characterized in that: The fastener (24) includes an anti-misalignment plate (241), a push plate (242), a plug rod (243), and a second spring (244). The anti-misalignment plate (241) is fixed to the top of one side of the baffle (231). A groove (S) is provided on the wiring plate (22) to cooperate with it. Track grooves (P) are provided on both sides of the groove (S). The push plate (242) slides in the track groove (P). The plug rod (243) slides on both sides of the wiring plate (22). A plug hole (K) is provided on the inner side of the fixing frame (21) to cooperate with it. The two ends of the second spring (244) are fixed to the plug rod (243) and the push plate (242) respectively.

5. The cantilever beam electric field sensor based on piezoelectric ceramics as described in claim 4, characterized in that: The fastener (24) also includes a fourth spring (245) and a limiting rod (246). The two ends of the fourth spring (245) are fixed to the push plate (242) and the inner wall of the track groove (P) respectively. The limiting rod (246) is fixed to the inner wall of the track groove (P) and cooperates with the push plate (242).

6. The cantilever beam electric field sensor based on piezoelectric ceramics as described in claim 5, characterized in that: The fastener (24) also includes a side plate (247), a push rod (248), a fixing block (249), and a fifth spring (250). The top and bottom of the fixing frame (21) are provided with through holes (V). The side plate (247) slides in the through hole (V). The push rod (248) is fixed to the top and bottom of one side of the trigger plate (25). The side plate (247) is provided with a groove (M) that matches it. The fixing block (249) is fixed in the through hole (V). The two ends of the fifth spring (250) are fixed to the fixing block (249) and the side plate (247) respectively.

7. The cantilever beam electric field sensor based on piezoelectric ceramics as described in claim 6, characterized in that: The trigger (26) includes a trigger rod (261) and a sixth spring (262). The trigger rod (261) is fixed to the inside of the trigger plate (25) and slides in the socket (K). The two ends of the sixth spring (262) are fixed to the trigger plate (25) and the fixing frame (21) respectively.

8. The cantilever beam electric field sensor based on piezoelectric ceramics as described in claim 7, characterized in that: The trigger (26) also includes a mounting block (263), which is fixed to the top and bottom of the fixed frame (21). The trigger plate (25) has a groove (Y) and the mounting block (263) slides in the groove (Y).

9. The cantilever beam electric field sensor based on piezoelectric ceramics as described in claim 8, characterized in that: The wire break component (27) includes a crossbar (271), a connecting plate (272), and a reset rod (273). The crossbar (271) slides within the fixing ring (233) and is located at the top and bottom of one side of the movable plate (235). The connecting plate (272) is fixed to both ends of the two movable plates (235). The reset rod (273) is fixed to one side of the trigger plate (25) and cooperates with the connecting plate (272).

10. The cantilever beam electric field sensor based on piezoelectric ceramics as described in claim 9, characterized in that: The wire break member (27) also includes a protrusion (274) which is fixed to the surface of the crossbar (271).

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