A rubber strip friction noise detection device

Abstract

The present invention discloses a rubber strip friction noise detection device, which relates to the field of rubber strip detection equipment. The technical solution is as follows: it includes a noise collection chamber and a driving chamber, a fixed seat is fixedly arranged in the noise collection chamber, a fixed frame is fixedly arranged on the fixed seat, a rotating rod is rotatably arranged on the fixed frame, a card slot is axially arranged on the rotating rod, and a rubber strip is fixedly arranged in the card slot; two vertical guide rods are arranged on one side of the fixed seat, the guide rods are fixedly connected to the noise collection chamber, a horizontal moving component is slidably arranged on the guide rods, and also includes a driving mechanism for driving the test plate to move up and down, and the driving mechanism is located in the driving chamber. The beneficial effects of the present invention are: abnormal noise during the friction of the rubber strip can be detected, and the noise value can be observed in real time; the noise of the operating environment can be eliminated, and the real abnormal noise of the rubber strip friction can be obtained.

Description

Technical Field

[0001] The invention relates to the field of rubber strip detection equipment, and in particular to a rubber strip friction noise detection device. Background Art

[0002] Rubber strips are increasingly used in car sunroofs and various parts of the vehicle to achieve waterproof, dustproof, soundproof, noise reduction, guide, decoration and sealing functions, which can increase the comfort of passengers. When various parts of the car are opened or closed, they rub against the rubber strips, causing abnormal noise.

[0003] However, the existing technology cannot directly and simply detect the noise caused by the friction of the rubber strip, and cannot provide the decibel value of the sound pressure level when the rubber strip is rubbed; since the operating noise of the test equipment is too loud, it is impossible to eliminate the influence of the operating environment noise. Summary of the invention

[0004] In view of the above technical problems, the present invention provides a rubber strip friction noise detection device.

[0005] The technical solution is as follows: it comprises a noise collection chamber and a driving chamber, wherein a fixed seat is fixedly arranged in the noise collection chamber, a fixed frame is fixedly arranged on the fixed seat, a rotating rod is rotatably arranged on the fixed frame, a slot is axially arranged on the rotating rod, and a rubber strip is fixedly arranged in the slot;

[0006] Two vertical guide rods are arranged on one side of the fixed seat, and the guide rods are fixedly connected to the noise collection chamber. A horizontal moving assembly is slidably arranged on the guide rods, and the horizontal moving assembly includes a sliding plate slidably connected to the guide rods, and a mounting seat is arranged parallel to one side of the sliding plate facing the rubber strip, and two groups of scissor arms are arranged between the sliding plate and the mounting seat, and the two groups of scissor arms are fixedly connected by a plurality of connecting rods, and an electric push rod is rotatably arranged on one end of the scissor arm close to the sliding plate, and two ends of the electric push rod are respectively connected to the rotation of two connecting rods at two ends of the scissor arm;

[0007] A plurality of suction cups are fixedly arranged on the mounting seat, and the test plates are adsorbed on the suction cups;

[0008] It also includes a driving mechanism for driving the test plate to move up and down, and the driving mechanism is located in the driving chamber.

[0009] Preferably, the driving mechanism comprises a fixed plate fixedly arranged in the noise collection chamber, two vertical screws are rotatably arranged on the fixed plate, a gear is coaxially fixedly arranged on the upper end of each screw, the two gears are meshed with each other, a driving motor is fixedly arranged above the noise collection chamber, and the motor shaft of the driving motor is coaxially fixed with one of the gears;

[0010] An "L"-shaped bracket is fixedly arranged on one side of the fixed plate, a sliding groove is provided at one end of the bracket away from the fixed plate, a movable seat is slidingly arranged in the sliding groove, the movable seat is fixedly connected to the sliding plate, and an adjuster is rotatably arranged on one side of the movable seat;

[0011] It also includes a linkage unit for driving the regulator to be threadedly connected with different lead screws.

[0012] Preferably, the regulator comprises an adjusting rod rotatably connected to the movable seat, a rectangular adjusting block is fixedly arranged at one end of the adjusting rod, a semicircular groove is respectively arranged on both sides of the adjusting block, the axis of the groove is parallel to the axis of the screw rod, an internal thread is arranged on the surface of each groove, and the regulator is threadedly connected to different screw rods through different internal threads;

[0013] A guide rod is fixedly arranged at one end of the adjusting rod away from the adjusting block.

[0014] Preferably, the linkage unit comprises an "L"-shaped toggle rod rotatably connected to the moving seat, the middle portion of the toggle rod is rotatably connected to the moving seat, one end of the toggle rod is provided with a guide groove, the guide rod slides in the guide groove, and the other end of the toggle rod is fixedly provided with one end of a tension spring;

[0015] A connecting rod is rotatably arranged on the movable seat, a rotation axis of the connecting rod is coaxial with a rotation axis of the toggle rod, and one end of the connecting rod away from the toggle rod is fixedly connected with the other end of the tension spring.

[0016] Preferably, a long groove is provided on the bracket, the long groove is parallel to the projection of the slide groove on the vertical plane, and a limiter is slidably provided at both ends of the long groove;

[0017] The limiter comprises a sliding block slidably connected to the long groove, a push rod is arranged on the side opposite to the sliding block, a threaded hole is provided through the middle of the sliding block, and a limiting bolt is threadedly connected in the threaded hole.

[0018] Preferably, a corrugated cover made of sound insulation material is fixedly provided at both upper and lower ends of the sliding plate, and the two corrugated covers are fixedly connected to the upper and lower sides of the noise collection chamber respectively.

[0019] Preferably, an inclined support plate is fixedly arranged below the fixing seat, and two noise sensors are fixedly arranged on the support plate, with monitoring ends of the noise sensors facing toward the rubber strip.

[0020] Preferably, a handle is fixedly provided at one end of the rotating rod, and a locking knob is provided on the fixing seat.

[0021] Preferably, an elastic sound insulation cover is provided between the sliding plate and the mounting seat.

[0022] The technical solution provided by the embodiment of the present invention has the beneficial effects of: being able to detect abnormal noise during the friction of the rubber strip and observe the noise value in real time; being able to eliminate the noise in the operating environment and obtain the actual abnormal noise caused by the friction of the rubber strip. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention.

[0024] Figure 2 for Figure 1 An enlarged schematic diagram of part A.

[0025] Figure 3 Schematic diagram of a horizontal moving assembly and a driving mechanism according to an embodiment of the present invention.

[0026] Figure 4 Schematic diagram of a horizontal moving component according to an embodiment of the present invention.

[0027] Figure 5 Schematic diagram of a driving mechanism according to an embodiment of the present invention.

[0028] Figure 6 for Figure 5 An enlarged schematic diagram of part B.

[0029] Figure 7 Schematic diagram of a regulator and linkage unit according to an embodiment of the present invention.

[0030] The accompanying drawings are marked as follows: 1. Noise collection chamber; 1-1. Fixing seat; 1-2. Fixing frame; 1-3. Rotating rod; 1-4. Rubber strip; 1-5. Guide rod; 1-6. Corrugated cover; 1-7. Support plate; 1-8. Noise sensor; 2. Horizontal moving assembly; 2-1. Sliding plate; 2-2. Mounting seat; 2-3. Scissor arm; 2-4. Electric push rod; 2-5. Suction cup; 2-6. Test plate; 3. Driving mechanism; 3-1. Fixing seat; 3-2. Fixing frame; 3-3. Suction cup; 3-4. Test plate; 3-5. Driving mechanism; 3-6. Fixed plate; 3-2, screw rod; 3-3, gear; 3-4, drive motor; 3-5, bracket; 3-51, slide groove; 3-52, long groove; 3-53, limiter; 3-6, moving seat; 3-7, adjuster; 3-71, adjusting rod; 3-72, adjusting block; 3-73, groove; 3-74, guide rod; 3-8, linkage unit; 3-81, toggle rod; 3-82, guide groove; 3-83, tension spring; 3-84, linkage rod. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. Of course, the specific embodiments described here are only used to explain the present invention and are not used to limit the present invention.

[0032] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0034] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0035] Example 1

[0036] See also Figures 1 to 7 The present invention provides a rubber strip friction noise detection device, comprising a noise collection chamber 1 and a driving chamber, a sound insulation cotton is arranged on the inner wall of the noise collection chamber 1, a movable door is arranged on one side of the noise collection chamber 1, a door handle is arranged at the middle of the movable end of the movable door, a fixed seat 1-1 is fixedly arranged in the noise collection chamber 1, a fixed frame 1-2 is fixedly arranged on the fixed seat 1-1, a rotating rod 1-3 is rotatably arranged on the fixed frame 1-2, a card slot is axially arranged on the rotating rod 1-3, and a rubber strip 1-4 is fixedly arranged in the card slot; when the noise detection of the rubber strip 1-4 is required, the rubber strip 1-4 is fixed in the card slot, and the rubber strip 1-4 is fixed by the rotating rod 1-3, the working state of the rubber strip 1-4 is simulated, the working environment of the rubber strip 1-4 is restored as much as possible, and the accuracy of the friction noise detection of the rubber strip 1-4 is improved;

[0037] Two vertical guide rods 1-5 are arranged on one side of the fixed seat 1-1, and the guide rods 1-5 are fixedly connected to the noise collection chamber 1. A horizontal moving assembly 2 is slidably arranged on the guide rods 1-5, and the horizontal moving assembly 2 includes a sliding plate 2-1 slidably connected to the guide rods 1-5, and a mounting seat 2-2 is arranged parallel to the side of the sliding plate 2-1 facing the rubber strip 1-4, and two groups of scissor arms 2-3 are arranged between the sliding plate 2-1 and the mounting seat 2-2. The two groups of scissor arms 2-3 are fixedly connected by a plurality of connecting rods, and the scissor arms 2-3 are rotated at one end close to the sliding plate 2-1 An electric push rod 2-4 is dynamically set, and the two ends of the electric push rod 2-4 are rotatably connected to the two connecting rods at the two ends of the scissor arm 2-3 respectively; the electric push rod 2-4 drives the mounting seat 2-2 to move in the horizontal direction. When noise detection is required, the electric push rod 2-4 drives the mounting seat 2-2 to approach the rubber strip 1-4 until the test plate 2-6 is against the rubber strip 1-4. After the test is completed, the electric push rod 2-4 shrinks to make the mounting seat 2-2 away from the rubber strip 1-4, so that the operator can take and put the rubber strip 1-4, thereby improving the convenience of operation;

[0038] A plurality of suction cups 2-5 are fixedly arranged on the mounting seat 2-2, and the suction cups 2-5 adsorb the test plate 2-6. The test plate 2-6 may be made of glass, metal plate or the like according to different tests;

[0039] It also includes a driving mechanism 3 for driving the test plates 2-6 to move up and down, and the driving mechanism 3 is located in the driving chamber.

[0040] The driving mechanism 3 includes a fixed plate 3-1 fixedly arranged in the noise collection chamber 1, two vertical screw rods 3-2 are rotatably arranged on the fixed plate 3-1, a gear 3-3 is coaxially fixedly arranged on the upper end of each screw rod 3-2, and the two gears 3-3 are meshed with each other. A driving motor 3-4 is fixedly arranged above the noise collection chamber 1, and the motor shaft of the driving motor 3-4 is coaxially fixed with one of the gears 3-3;

[0041] An "L"-shaped bracket 3-5 is fixedly arranged on one side of the fixed plate 3-1, a slide groove 3-51 is provided at one end of the bracket 3-5 away from the fixed plate 3-1, a movable seat 3-6 is slidably arranged in the slide groove 3-51, the movable seat 3-6 is fixedly connected to the sliding plate 2-1, and an adjuster 3-7 is rotatably arranged on one side of the movable seat 3-6;

[0042] It also includes a linkage unit 3-8 for driving the regulator 3-7 to be threadedly connected with different screw rods 3-2.

[0043] The adjuster 3-7 includes an adjusting rod 3-71 rotatably connected to the moving seat 3-6, a rectangular adjusting block 3-72 is fixedly arranged at one end of the adjusting rod 3-71, a semicircular groove 3-73 is respectively provided on both sides of the adjusting block 3-72, the axis of the groove 3-73 is parallel to the axis of the screw rod 3-2, and the surface of each groove 3-73 is provided with an internal thread, and the adjuster 3-7 is threadedly connected to different screw rods 3-2 through different internal threads. When the adjuster 3-7 is threadedly connected to one of the screw rods 3-2, the other groove 3-73 of the adjusting block 3-72 is separated from the screw rod 3-2 adjacent to it;

[0044] A guide rod 3-74 is fixedly provided at one end of the adjusting rod 3-71 away from the adjusting block 3-72.

[0045] The linkage unit 3-8 includes an "L"-shaped toggle rod 3-81 rotatably connected to the moving seat 3-6, the middle portion of the toggle rod 3-81 is rotatably connected to the moving seat 3-6, one end of the toggle rod 3-81 is provided with a guide groove 3-82, the guide rod 3-74 slides in the guide groove 3-82, and the other end of the toggle rod 3-81 is fixedly provided with one end of a tension spring 3-83;

[0046] A connecting rod 3-84 is rotatably set on the movable seat 3-6, and the rotation axis of the connecting rod 3-84 is coaxial with the rotation axis of the toggle rod 3-81. One end of the connecting rod 3-84 away from the toggle rod 3-81 is fixedly connected to the other end of the tension spring 3-83.

[0047] The bracket 3-5 is provided with a long groove 3-52, the long groove 3-52 is parallel to the projection of the slide groove 3-51 on the vertical plane, and a limiter 3-53 is slidably provided at both ends of the long groove 3-52;

[0048] The limiter 3-53 includes a slider slidably connected to the long groove 3-52, a push rod is arranged on the opposite side of the slider, a threaded hole is provided through the middle of the slider, and a limit bolt is threadedly connected in the threaded hole.

[0049] By adjusting the positions of the two limiters 3-53 on the long groove 3-52, the range of the up and down reciprocating movement of the movable seat 3-6 can be controlled, and it can be adjusted according to the sizes of different test plates 2-6 to expand the scope of use of the device.

[0050] When the screw rod 3-2 drives the movable seat 3-6 to move upward through the adjuster 3-7, when one end of the connecting rod 3-84 abuts against the top rod, the movable seat 3-6 continues to move upward, and the top rod abuts against the connecting rod 3-84. When the movable seat 3-6 moves to one side of the adjuster 3-7, the connecting rod 3-84 moves downward, and the toggle rod 3-81 is pulled to move by the action of the tension spring 3-83. During the rotation, the toggle rod 3-81 drives the adjuster 3-7 to be threadedly connected with another screw rod 3-2. At this time, the movable seat 3-6 moves downward under the action of the screw rod 3-2 until one end of the connecting rod 3-84 abuts against the limiter 3-53 below. The reciprocating movement of the movable block is realized through the joint action of the connecting unit 3-8 and the limiter 3-53.

[0051] A corrugated cover 1-6 made of sound insulation material is fixedly provided at both upper and lower ends of the sliding plate 2-1, and the two corrugated covers 1-6 are fixedly connected to the upper and lower sides of the noise collection chamber 1 respectively; the corrugated covers 1-6 can separate the noise collection chamber 1 from the driving chamber, can isolate the noise generated when various parts in the driving chamber are working, and perform overall sound insulation and silencing on the noise collection chamber 1, reduce external sound interference, and improve the accuracy of noise collection.

[0052] An inclined support plate 1-7 is fixedly arranged below the fixed seat 1-1, and two noise sensors 1-8 are fixedly arranged on the support plate 1-7, and the monitoring end of the noise sensor 1-8 faces the rubber strip 1-4; when the test plate 2-6 moves up and down, friction noise is generated between the test plate 2-6 and the rubber strip 1-4, and the friction noise is collected by the noise sensor 1-8. The device can be externally connected to a noise analysis device, and the noise analysis device is used to receive the noise signal collected by the noise sensor 1-8 and perform time-frequency domain conversion on the noise signal to extract the real frequency domain characteristics of the friction abnormal sound; the noise index of the rubber strip 1-4 is intuitively evaluated.

[0053] A handle is fixed at one end of the rotating rod 1-3, and a locking knob is set on the fixed seat 1-1. When friction detection of rubber strips 1-4 at different angles is required, the locking knob is loosened, and the rubber strip 1-4 is rotated to a certain angle by adjusting the handle, and then the rotating rod 1-3 is locked using the locking knob.

[0054] An elastic soundproof cover is arranged between the sliding plate 2-1 and the mounting seat 2-2, and the soundproof cover can separate the noise collection chamber 1 from the electric push rod 2-4, and can isolate the noise generated when the electric push rod 2-4 is working, and perform overall soundproofing and silencing on the noise collection chamber 1, thereby reducing external sound interference and improving the accuracy of noise collection.

[0055] When the present invention is used, the rubber strip 1-4 is fixed in the rotating rod 1-3, and the rotation angle of the rubber strip 1-4 is selected according to the actual situation, and a suitable test plate 2-6 is selected and placed on the suction cup 2-5, and the movable door of the noise collection chamber 1 is closed to form a closed and soundproof working environment in the noise collection chamber 1, and the electric push rod 2-4 is started to drive the test plate 2-6 to abut against the rubber strip 1-4, and then the drive motor 3-4 is started to drive the test plate 2-6 to move up and down reciprocatingly, and the friction between the test plate 2-6 and the rubber strip 1-4 generates noise, and the friction noise is collected by the noise sensor 1-8, so that the abnormal noise during the friction of the rubber strip can be detected, and the noise value can be observed in real time.

[0056] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A rubber strip friction noise detection device, characterized in that: It comprises a noise collection chamber (1) and a driving chamber, wherein a fixed seat (1-1) is fixedly arranged in the noise collection chamber (1), a fixed frame (1-2) is fixedly arranged on the fixed seat (1-1), a rotating rod (1-3) is rotatably arranged on the fixed frame (1-2), a slot is axially arranged on the rotating rod (1-3), and a rubber strip (1-4) is fixedly arranged in the slot; Two vertical guide rods (1-5) are arranged on one side of the fixed seat (1-1), the guide rods (1-5) are fixedly connected to the noise collection chamber (1), a horizontal moving assembly (2) is slidably arranged on the guide rods (1-5), the horizontal moving assembly (2) comprises a sliding plate (2-1) slidably connected to the guide rods (1-5), a mounting seat (2-2) is arranged parallel to the side of the sliding plate (2-1) facing the rubber strip (1-4), two groups of scissor arms (2-3) are arranged between the sliding plate (2-1) and the mounting seat (2-2), the two groups of scissor arms (2-3) are fixedly connected by a plurality of connecting rods, an electric push rod (2-4) is rotatably arranged at one end of the scissor arms (2-3) close to the sliding plate (2-1), and two ends of the electric push rod (2-4) are respectively rotatably connected to the connecting rods at two ends of the scissor arms; A plurality of suction cups (2-5) are fixedly arranged on the mounting seat (2-2), and the test plate (2-6) is adsorbed on the suction cups (2-5); It also comprises a driving mechanism (3) for driving the test plate (2-6) to move up and down, and the driving mechanism (3) is located in the driving chamber.

2. The rubber strip friction noise detection device according to claim 1, characterized in that: The driving mechanism (3) comprises a fixing plate (3-1) fixedly arranged in the noise collection chamber (1), two vertical screw rods (3-2) being rotatably arranged on the fixing plate (3-1), a gear (3-3) being coaxially fixedly arranged on the upper end of each screw rod (3-2), the two gears (3-3) being meshed with each other, a driving motor (3-4) being fixedly arranged above the noise collection chamber (1), the motor shaft of the driving motor (3-4) being coaxially fixed to one of the gears (3-3); An "L"-shaped bracket (3-5) is fixedly arranged on one side of the fixed plate (3-1); a sliding groove (3-51) is provided at one end of the bracket (3-5) away from the fixed plate (3-1); a movable seat (3-6) is slidingly arranged in the sliding groove (3-51); the movable seat (3-6) is fixedly connected to the sliding plate (2-1); and an adjuster (3-7) is rotatably arranged on one side of the movable seat (3-6); It also includes a linkage unit (3-8) for driving the regulator (3-7) to be threadedly connected to different screw rods (3-2).

3. The rubber strip friction noise detection device according to claim 2, characterized in that: The regulator (3-7) comprises an adjusting rod (3-71) rotatably connected to the movable seat (3-6); a rectangular adjusting block (3-72) is fixedly arranged at one end of the adjusting rod (3-71); a semicircular arc groove (3-73) is respectively arranged on both sides of the adjusting block (3-72); the axis of the groove (3-73) is parallel to the axis of the screw rod (3-2); the surface of each groove (3-73) is provided with an internal thread; and the regulator (3-7) is threadedly connected to different screw rods (3-2) via different internal threads; A guide rod (3-74) is fixedly disposed on one end of the adjusting rod (3-71) away from the adjusting block (3-72).

4. The rubber strip friction noise detection device according to claim 3, characterized in that: The linkage unit (3-8) comprises an "L"-shaped toggle rod (3-81) rotatably connected to the movable seat (3-6); the middle portion of the toggle rod (3-81) is rotatably connected to the movable seat (3-6); a guide groove (3-82) is provided at one end of the toggle rod (3-81); the guide rod (3-74) slides in the guide groove (3-82); and one end of a tension spring (3-83) is fixedly provided at the other end of the toggle rod (3-81); A connecting rod (3-84) is rotatably arranged on the movable seat (3-6), the rotation axis of the connecting rod (3-84) is coaxial with the rotation axis of the toggle rod (3-81), and one end of the connecting rod (3-84) away from the toggle rod (3-81) is fixedly connected to the other end of the tension spring (3-83).

5. The rubber strip friction noise detection device according to claim 4, characterized in that: The bracket (3-5) is provided with a long groove (3-52), the long groove (3-52) is parallel to the projection of the slide groove (3-51) on the vertical plane, and a stopper (3-53) is slidably provided at both ends of the long groove (3-52); The limiter (3-53) comprises a sliding block slidably connected to the long slot (3-52), a push rod is arranged on the side opposite to the sliding block, a threaded hole is provided through the middle of the sliding block, and a limiting bolt is threadedly connected in the threaded hole.

6. The rubber strip friction noise detection device according to claim 1, characterized in that: A corrugated cover (1-6) made of sound insulation material is fixedly provided at both upper and lower ends of the sliding plate (2-1), and the two corrugated covers (1-6) are respectively fixedly connected to the upper and lower sides of the noise collection chamber (1).

7. The rubber strip friction noise detection device according to claim 1, characterized in that: An inclined support plate (1-7) is fixedly arranged below the fixing seat (1-1), and two noise sensors (1-8) are fixedly arranged on the support plate (1-7), wherein the monitoring ends of the noise sensors (1-8) face toward the rubber strip (1-4).

8. The rubber strip friction noise detection device according to claim 1, characterized in that: A handle is fixedly arranged at one end of the rotating rod (1-3), and a locking knob is arranged on the fixing seat (1-1).

9. The rubber strip friction noise detection device according to claim 1, characterized in that: An elastic sound insulation cover is provided between the sliding plate (2-1) and the mounting seat (2-2).

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