Testing the pulley mechanism for the arc movement of the arm structure of noise-cancelling headphones or earmuffs

Abstract

The present invention discloses a pulley mechanism for testing the radian motion of an arm structure for sound pickup and noise reduction headphones or earmuffs. This mechanism belongs to the technical field of mechanical testing equipment and includes a fixed frame and a dynamometer. The fixed frame is topped with a fixing clamping device for clamping the dynamometer. A push-pull force testing machine is located next to the fixed frame and electrically connected to the dynamometer. The fixed frame is provided with a product clamping platform, which is equipped with an arm for securing the arm. An adjustable wheel assembly is located next to the product clamping platform. A pull member is located on the sidewall of the fixed frame. The dynamometer is provided with a traction rope that passes through the pull member, the adjustable wheel assembly, and the arm in sequence. The present invention allows for rapid commissioning and, for products used to test radian motion torque, offers advantages such as versatility, wide compatibility, and low cost. This significantly improves data acquisition (CPK), product consistency, testing efficiency, and comparative analysis.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical testing equipment, and in particular relates to a pulley mechanism for testing the arc motion of an arm structure of a sound pickup and noise reduction headset or earmuff. Background Art

[0002] In the manufacturing and laboratories of noise-canceling headphones or earmuffs, testing the strength and durability of the arm's motion structure is crucial. Traditional tensile testing methods typically measure only a single directional / downward force and are unable to simulate the mechanical properties of complex motion paths. For applications requiring the assessment of the arm's forces during arc motion, existing testing equipment and methods are insufficient.

[0003] Therefore, there is an urgent need for a new mechanism that can accurately measure the upward and downward pulling force of the arm when it moves in an arc. Summary of the Invention

[0004] The embodiment of the present invention provides a pulley mechanism for testing the arc motion of an arm structure of a sound pickup and noise reduction headphone or earmuff, so as to solve the problems in the prior art.

[0005] The embodiment of the present invention adopts the following technical solution: a pulley mechanism for testing the arc movement of the arm structure of sound-pickup noise-cancelling headphones or earmuffs, including a fixed frame and a tensile gauge, the top of the fixed frame is provided with a fixed clamping device for clamping the tensile gauge; a push-pull force testing machine is provided on the side of the fixed frame, and the push-pull force testing machine is electrically connected to the tensile gauge, a product clamping platform is provided on the fixed frame, and a support arm is provided on the product clamping platform, and the product clamping platform is used to fix the support arm, an adjustable wheel group is provided on the side of the product clamping platform, a pulling member is provided on the side wall of the fixed frame, and a traction rope is provided on the tensile gauge that passes through the pulling member, the adjustable wheel group and the support arm in sequence.

[0006] Furthermore, the fixed clamping device includes a fixed frame, two fixed plates and two fixed screws. The fixed frame is U-shaped and is arranged on the upper side wall of the fixed frame. The two fixed screws are symmetrically arranged on both sides of the fixed frame. The fixed screw is threadedly connected to the fixed frame. One end of the fixed screw is rotatably connected to the fixed plate. A knob is provided on the other end of the fixed screw. Two limit rods that slide with the fixed frame are provided on the fixed plate. The dynamometer is located between the two fixed plates.

[0007] Furthermore, the product clamping platform includes a support plate, a clamping seat and a clamping plate. The support plate is located below the fixed frame. The clamping seat is provided with two fixing grooves, each of which is provided with a first screw. The clamping seat is installed on the support plate through the first screw. The clamping plate is provided with two long strip-shaped sliding grooves, each of which is provided with a second screw. The clamping plate is installed on the top of the clamping seat through the two second screws.

[0008] Furthermore, the adjustable wheel group includes a support seat, a pulley, a rotating shaft and two connecting plates. The support seat is arranged on the top of the support plate. Two symmetrically arranged adjustment slots are provided on the support seat. The two connecting plates are symmetrically arranged in the two adjustment slots of the support seat. The pulley is rotatably connected to the rotating shaft. Each of the connecting plates is provided with an adjustment slot. The two ends of the rotating shaft are installed in the two adjustment slots of the two connecting plates.

[0009] Furthermore, the pulling members are provided in three groups, and the three groups of pulling members are staggeredly arranged on the side wall of the fixing frame.

[0010] Furthermore, each group of the pulling members includes a mounting plate, a pulling wheel, a pulling shaft and two vertical plates, the mounting plate is connected to the side wall of the fixed frame, the two vertical plates are symmetrically connected to the mounting plate, the pulling wheel is rotatably connected to the pulling shaft, and the two ends of the pulling shaft are connected to the two vertical plates.

[0011] The at least one technical solution adopted in the embodiment of the present invention can achieve the following beneficial effects:

[0012] First, the present invention can be debugged quickly. For products that test torque in radian motion, its versatility, wide compatibility, and low cost can provide better help in data acquisition CPK, finished product consistency, test efficiency, comparative analysis, etc.

[0013] Secondly, the present invention effectively tests the upward / downward pulling force on the sound pickup and noise reduction headphones or earmuffs when the support arm moves in an arc, ensuring that the force is in a vertical state during the test, and the repeated test data is stable, maintaining the authenticity of the data.

[0014] Third, the test of the present invention is accurate and stable: the low-damping adjustable pulley group controls the tension loss, and the push-pull testing machine is used to accurately set the speed and stroke. Combined with the tensile gauge on the fixed frame, it ensures that the tension data of the upper and lower arc movements are accurate and consistent; the smooth vertical traction rope reduces friction interference to ensure that the repeatability test is true and effective; strong versatility: the product clamping table is suitable for standard parts and special-shaped parts, and the adjustable pulley group can adjust the spacing according to the size of the product, and is compatible with headphones / earmuffs of different specifications; reliable operation: the clamping table fixes the support arm to prevent movement, the standard equipment is easy to operate, and the mechanism can complete the up and down bidirectional test at one time, fully covering the support arm arc motion performance testing needs, and providing efficient support for product research and development and quality control. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0016] Figure 1 It is a front view of the present invention;

[0017] Figure 2 It is a schematic diagram of the local three-dimensional structure of the present invention Figure 1 ;

[0018] Figure 3 It is a schematic diagram of the local three-dimensional structure of the present invention Figure 2 ;

[0019] Figure 4 It is a schematic diagram of the three-dimensional structure of the present invention;

[0020] Figure 5 It is a schematic diagram of the three-dimensional structure of the fixed clamping device in the present invention;

[0021] Figure 6 This is a schematic diagram of the three-dimensional structure of the clamping platform, support arm and adjustable wheel assembly of the product of the present invention;

[0022] Figure 7 This is a disassembled view of the three-dimensional structure of the product clamping platform in the present invention;

[0023] Figure 8 It is a schematic diagram of the three-dimensional structure of the adjustable wheel assembly in the present invention;

[0024] Figure 9 This is a disassembled view of the three-dimensional structure of the adjustable wheel assembly in the present invention;

[0025] Figure 10 Schematic diagram of the three-dimensional structure of the pulling member in the present invention;

[0026] Figure 11 This is a disassembled three-dimensional diagram of the pulling member of the present invention;

[0027] Figure 12 The figure shows the schematic diagram of the pulling force when the test product moves in an upward arc;

[0028] Figure 13 The figure shows the schematic diagram of the tensile force when the test product moves in a downward arc.

[0029] Reference numerals:

[0030] Fixed frame 1, dynamometer 2, fixed clamping device 3, fixed frame 31, fixed plate 32, fixed screw 33, knob 34, limit rod 35, push-pull testing machine 4, product clamping platform 5, support plate 51, clamping seat 52, clamping plate 53, fixed groove 54, first screw 55, slide groove 56, second screw 57, support arm 6, adjustable wheel group 7, support seat 71, pulley 72, rotating shaft 73, connecting plate 74, adjusting groove 75, adjusting groove 76, pulling member 8, mounting plate 81, pulling wheel 82, pulling shaft 83, vertical plate 84, traction rope 9. DETAILED DESCRIPTION

[0031] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and corresponding drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] The following describes in detail the technical solutions of the pulley mechanism for testing the arc motion of the arm structure of the sound pickup and noise reduction headphones or earmuffs provided by various embodiments of the present invention in conjunction with the accompanying drawings.

[0033] Reference Figures 1 to 13 As shown, an embodiment of the present invention provides a pulley mechanism for testing the arc movement of the arm structure of sound-pickup noise-cancelling headphones or earmuffs, comprising a fixed frame 1 and a dynamometer 2. The top of the fixed frame 1 is provided with a fixing clamping device 3 for clamping the dynamometer 2; a push-pull force testing machine 4 is provided on the side of the fixed frame 1, and the push-pull force testing machine 4 is electrically connected to the dynamometer 2; a product clamping platform 5 is provided on the fixed frame 1, and a support arm 6 is provided on the product clamping platform 5, and the product clamping platform 5 is used to fix the support arm 6; an adjustable wheel group 7 is provided on the side of the product clamping platform 5, a pulling member 8 is provided on the side wall of the fixed frame 1, and a traction rope 9 is provided on the dynamometer 2, which passes through the pulling member 8, the adjustable wheel group 7 and the support arm 6 in sequence.

[0034] The function of the push-pull testing machine 4 is that the device can set a uniform upward / downward speed and a stroke setting to meet the speed of the product being tested and the position stop during arc movement, ensuring data stability during product testing.

[0035] The function of the dynamometer 2 is to read the specific value of the tension in a stable state;

[0036] The function of the traction rope 9 is to keep it in a vertical state with the dynamometer 2 when testing the tension. The surface is smooth and will not cause excessive friction during traction, thus keeping the repeatability of the tension data test true and effective.

[0037] The present invention can be debugged quickly. For products that test torque in radian motion, the invention has the characteristics of versatility, wide compatibility, and low cost, which can provide better help in data acquisition CPK, finished product consistency, test efficiency, comparative analysis, etc.

[0038] The test of the present invention is accurate and stable: 72 sets of low-damping adjustable pulleys control tension loss, and are matched with a push-pull testing machine 4 to accurately set the speed and stroke. Combined with the dynamometer 2 on the fixed frame 1, the tension data of the upper and lower arc movements are ensured to be accurate and consistent; the smooth vertical traction rope 9 reduces friction interference to ensure that the repeatability test is true and effective; strong versatility: the product clamping table 5 is suitable for standard parts and special-shaped parts, and the 72 sets of adjustable pulleys can adjust the spacing according to the size of the product, and are compatible with headphones / earmuffs of different specifications; reliable operation: the clamping table fixes the support arm 6 to prevent movement, and the standard equipment is easy to operate. The mechanism can complete up and down bidirectional testing at one time, comprehensively covering the requirements for detecting the arc movement performance of the support arm 6, and providing efficient support for product research and development and quality control.

[0039] like Figure 12 As shown, the tensile force of the product when it moves in an upward arc is tested. Figure 13 As shown, test the pulling force of the product when it moves in a downward arc.

[0040] Specifically, the fixed clamping device 3 includes a fixed frame 31, two fixed plates 32 and two fixed screws 33. The fixed frame 31 is U-shaped and is arranged on the upper side wall of the fixed frame 1. The two fixed screws 33 are symmetrically arranged on both sides of the fixed frame 31. The fixed screw 33 is threadedly connected to the fixed frame 31. One end of the fixed screw 33 is rotatably connected to the fixed plate 32. A knob 34 is provided on the other end of the fixed screw 33. The fixed plate 32 is provided with two limit rods 35 that slide with the fixed frame 31. The dynamometer 2 is located between the two fixed plates 32.

[0041] When clamping and fixing the dynamometer 2, after placing the dynamometer 2 between the two fixing plates 32, rotating the two knobs 34 at the same time will respectively drive the two fixing screws 33 to rotate on the fixing frame 31, thereby driving the two fixing plates 32 to move on the fixing frame 31 through the corresponding two limit rods 35, so that the positions of the two fixing plates 32 are moved toward the middle position, and the position of the dynamometer 2 is fixed and clamped. It is also very convenient and quick to disassemble the dynamometer 2. You only need to rotate the two knobs 34 in the opposite direction to separate the two fixing plates 32 to both sides, so that the dynamometer 2 can be taken out from between the two fixing plates 32 for replacement and disassembly.

[0042] Specifically, the product clamping platform 5 includes a support plate 51, a clamping seat 52 and a clamping plate 53. The support plate 51 is located below the fixed frame 1. The clamping seat 52 is provided with two fixing grooves 54, each of which is provided with a first screw 55. The connection between the support plate 51 and the clamping seat 52 is achieved by connecting the support plate 51 and the clamping seat 52 in the two fixing grooves 54 with the two first screws 55. The clamping seat 52 is installed on the support plate 51 by the first screw 55. The clamping plate 53 is provided with two long strip-shaped sliding grooves 56, each of which is provided with a second screw 57. The clamping plate 53 is installed on the top of the clamping seat 52 by the two second screws 57.

[0043] During the test, the arm 6 to be tested is placed on the top of the clamping seat 52, and then the clamping plate 53 is connected to the clamping seat 52 through two second screws 57. The two second screws 57 are tightened so that the clamping plate 53 and the clamping seat 52 clamp and fix the position of the arm 6. The product clamping table 5 in the present invention can ignore the appearance of the product, and can fix standard parts or special-shaped parts, and has wide versatility.

[0044] It should be noted that protective pads are provided on the top of the clamping seat 52 and the bottom of the clamping plate 53. The protective pads can protect the support arm 6 and prevent damage and scratches to the support arm 6 during the clamping and fixing process.

[0045] Specifically, the adjustable wheel group 7 includes a support base 71, a pulley 72, a rotating shaft 73 and two connecting plates 74. The support base 71 is arranged on the top of the support plate 51. Two symmetrically arranged adjustment grooves 75 are provided on the support base 71. The two connecting plates 74 are symmetrically arranged in the two adjustment grooves 75 of the support base 71. The pulley 72 is rotatably connected to the rotating shaft 73. Each of the connecting plates 74 is provided with an adjustment groove 76. The two ends of the rotating shaft 73 are installed in the two adjustment grooves 76 of the two connecting plates 74.

[0046] During use, the installation positions of the two connecting plates 74 on the support base 71 can be adjusted according to the size of the product, and the installation positions of the rotating shaft 73 on the two connecting plates 74 can also be adjusted.

[0047] The function of the adjustable wheel group 7 is to test the downward pulling pulley 72. The pulley 72 is a low-damping traction power to ensure that the loss / increase factors during the test tension are controllable and consistent. The design spacing is adjustable and the position can be adjusted according to the size of the test product.

[0048] Specifically, there are three groups of pulling members 8, and the three groups of pulling members 8 are staggered on the side wall of the fixed frame 1; each group of pulling members 8 includes a mounting plate 81, a pulling wheel 82, a pulling shaft 83 and two vertical plates 84, the mounting plate 81 is connected to the side wall of the fixed frame 1, the two vertical plates 84 are symmetrically connected to the mounting plate 81, the pulling wheel 82 is rotatably connected to the pulling shaft 83, and the two ends of the pulling shaft 83 are connected to the two vertical plates 84.

[0049] When conducting test pulling, the direction of pulling force can be precisely changed: through the steering design of the staggered pulling wheel 82, the pulling direction of the pulling rope 9 is precisely matched with the arc motion trajectory of the tested support arm 6, such as vertical pulling during upward or downward testing, to ensure that the pulling force always acts in the target direction, avoiding distortion of the test data due to angle deviation.

[0050] Working principle:

[0051] Equipment installation and commissioning:

[0052] Place the fixing frame 1 in a suitable position, turn the fixing screw 33 by the knob 34 of the fixing clamping device 3, adjust the distance between the two fixing plates 32, and fix the tensile gauge 2 between them to ensure stability; complete the electrical connection between the push-pull tester 4 and the tensile gauge 2.

[0053] According to the size of the arm 6 to be tested, adjust the position of the connecting plate 74 in the adjustable wheel group 7 in the adjustment groove 75 of the support seat 71, and the position of the rotating shaft 73 in the adjustment groove 76 of the connecting plate 74 to set the spacing between the pulleys 72; at the same time, fix the clamping seat 52 of the product clamping table 5 to the support plate 51 by the first screw 55.

[0054] Product clamping:

[0055] Place the arm 6 to be tested on top of the clamping seat 52, cover it with the clamping plate 53, tighten the second screw 57, and use the clamping plate 53 and the clamping seat 52 to clamp the arm 6. The protective pad prevents the arm 6 from being damaged. The clamping process is suitable for standard parts and special-shaped products.

[0056] Tow rope arrangement:

[0057] The traction rope 9 is passed through the traction wheels 82 of the three groups of traction members 8 staggered on the side wall of the fixed frame 1 in sequence, then passed around the pulley 72 of the adjustable wheel group 7, and finally connected to the support arm 6 to ensure that the traction rope 9 remains vertical to the dynamometer 2 during the test.

[0058] Testing process:

[0059] The uniform upward / downward speed and stroke parameters are set on the push-pull testing machine 4, the equipment is started, and the support arm 6 is driven to move in an upward or downward arc.

[0060] During the movement, the pulley 72 reduces the tension loss by virtue of its low damping characteristics, and the staggered pulling wheels 82 accurately change the tension direction of the traction rope 9 to match the arc motion trajectory of the support arm 6; the surface of the traction rope 9 is smooth to reduce friction interference.

[0061] Data collection and analysis:

[0062] The dynamometer 2 reads and records the value of the tension applied to the support arm 6 during the arc motion in real time, and the data is synchronously transmitted to the push-pull testing machine 4 .

[0063] After completing the upward or downward arc motion test, analyze the collected data and evaluate the performance of the arm 6; if the test needs to be repeated, the device can be quickly reset and the test process can be performed again.

[0064] The foregoing is merely an embodiment of the present invention and is not intended to limit the present invention. It will be apparent to those skilled in the art that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are intended to be included within the scope of the claims of the present invention.

Claims

1. A pulley mechanism for testing the arc motion of the arm structure of a sound pickup noise reduction headset or earmuff, characterized in that: It comprises a fixed frame (1) and a tensile gauge (2), wherein the top of the fixed frame (1) is provided with a fixed clamping device (3) for clamping the tensile gauge (2); a push-pull force testing machine (4) is provided on the side of the fixed frame (1), and the push-pull force testing machine (4) is electrically connected to the tensile gauge (2); a product clamping platform (5) is provided on the fixed frame (1), and a support arm (6) is provided on the product clamping platform (5), and the product clamping platform (5) is used to fix the support arm (6); an adjustable wheel group (7) is provided on the side of the product clamping platform (5); a pulling member (8) is provided on the side wall of the fixed frame (1), and a traction rope (9) is provided on the tensile gauge (2) that passes through the pulling member (8), the adjustable wheel group (7) and the support arm (6) in sequence; The adjustable wheel assembly (7) includes a support seat (71), a pulley (72), a rotating shaft (73) and two connecting plates (74), wherein the support seat (71) is arranged on the top of the support plate (51), the support seat (71) is provided with two symmetrically arranged adjustment grooves (75), and the two connecting plates (74) are symmetrically arranged in the two adjustment grooves (75) of the support seat (71), the pulley (72) is rotatably connected to the rotating shaft (73), each of the connecting plates (74) is provided with an adjustment groove (76), and both ends of the rotating shaft (73) are installed in the two adjustment grooves (76) of the two connecting plates (74); The pulling members (8) are provided in three groups, and the three groups of pulling members (8) are staggeredly arranged on the side wall of the fixing frame (1); Each group of pulling members (8) includes a mounting plate (81), a pulling wheel (82), a pulling shaft (83) and two vertical plates (84), wherein the mounting plate (81) is connected to the side wall of the fixing frame (1), the two vertical plates (84) are symmetrically connected to the mounting plate (81), the pulling wheel (82) is rotatably connected to the pulling shaft (83), and the two ends of the pulling shaft (83) are connected to the two vertical plates (84).

2. The pulley mechanism for testing the arc motion of the arm structure of the sound pickup noise reduction headphone or earmuff according to claim 1, characterized in that: The fixing clamping device (3) comprises a fixing frame (31), two fixing plates (32) and two fixing screws (33), wherein the fixing frame (31) is arranged in a U-shape and is arranged on the upper side wall of the fixing frame (1). The two fixing screws (33) are symmetrically arranged on both sides of the fixing frame (31), the fixing screws (33) are threadedly connected to the fixing frame (31), one end of the fixing screw (33) is rotatably connected to the fixing plate (32), the other end of the fixing screw (33) is provided with a knob (34), the fixing plate (32) is provided with two limit rods (35) that are slidably matched with the fixing frame (31), and the dynamometer (2) is located between the two fixing plates (32).

3. The pulley mechanism for testing the arc motion of the arm structure of the sound pickup noise reduction headphone or earmuff according to claim 1, characterized in that: The product clamping platform (5) includes a support plate (51), a clamping seat (52) and a clamping plate (53), wherein the support plate (51) is located below the fixing frame (1), and the clamping seat (52) is provided with two fixing grooves (54), each of which is provided with a first screw (55), and the clamping seat (52) is mounted on the support plate (51) by the first screw (55), and the clamping plate (53) is provided with two long strip-shaped sliding grooves (56), each of which is provided with a second screw (57), and the clamping plate (53) is mounted on the top of the clamping seat (52) by the two second screws (57).

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