Piano key visual detection system

Abstract

The utility model provides a piano key visual detection system belongs to piano debugging technical field. Including the equipment main part of horizontal placement and the press of a plurality of key keys, the movable seat is vertically slid in the equipment main part and is connected with the press part for the downward contact measured key, the movable seat is provided with the displacement sensor for detecting the movable seat removal distance, is provided with the weight sensor on the press part, is provided with the display screen on the equipment main part. Through the equipment main part is placed on the keyboard measured key one side's several key, makes the press part of equipment main part alignment measured key, the movable seat drops and makes the press part press key to touch the bottom, and the displacement sensor real -time detection movable seat's drop distance, and gravity sensor real -time detection press part stress condition. Through the real -time detection data of two sensors, can obtain the key depth of piano key and the resistance and change situation in the process of key press, has the effect that improves key detection convenience.

Description

Technical Field

[0001] This utility model relates to the field of piano tuning technology, and in particular to a visual detection system for piano keys. Background Technology

[0002] For a piano, the uniformity of key depth directly affects the player's speed, force, and control over dynamics. A well-designed keyboard allows for effortless and expressive playing, fully showcasing the player's musical talent. For piano manufacturers, precise adjustment and measurement of key depth directly reflects their operational experience and technical expertise in piano manufacturing.

[0003] Patent CN201724665U discloses a piano keyboard laser rangefinder device, including a guide rail, a guide rail base, a laser tester, and a controller. The guide rail is mounted on the guide rail base, the laser tester is mounted on the guide rail, and the controller is connected to the laser tester via a data cable. The device is placed on the piano keyboard, and according to national standards, a 200-gram weight is placed at a specified position in front of the white (or black) key, causing the white (or black) key to sink. The laser tester then measures the sinking distance N between the sinking white (or black) key and the laser tester. The difference between this sinking distance N and the initial distance M is the absolute value of the sinking depth of the white (or black) key.

[0004] However, this device requires the assembly of multiple guide rails and the fixing of the bases at both ends of the guide rails to the sides of the piano keyboard before the laser tester can move horizontally above the keyboard. The installation process is complicated, and the keyboard of a standard piano is very long. The long span of the guide rails will cause excessive clamping force at both ends, which can easily damage the piano surface. In addition, when the laser tester moves to the middle of the guide rails, the middle of the guide rails is prone to sagging. Therefore, a more convenient piano testing device is needed. Utility Model Content

[0005] In view of the above problems, this utility model provides a visual detection system for piano keys.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A visual inspection system for piano keys is provided, comprising a main body that is laid flat and presses down on several piano keys, a movable seat that is vertically slidably arranged inside the main body, a driving component that drives the movable seat to move vertically up and down on the main body, a pressing part that is connected to the movable seat for contacting the key to be tested downwards, a displacement sensor that is arranged on the movable seat for detecting the moving distance of the movable seat, and a weight sensor that is arranged on the pressing part.

[0007] Furthermore, the driving component includes a servo drive motor, several guide columns are vertically fixed inside the main body of the equipment, the movable seat is vertically slidably connected to the guide columns, the servo drive motor is fixedly installed on the top of the main body of the equipment, the output end of the servo drive motor is coaxially fixedly connected to a drive screw, a transmission block is fixedly installed on the movable seat, the transmission block has a threaded hole, and the drive screw is threadedly connected to the threaded hole.

[0008] Furthermore, the pressing part includes a pressing head, and the weight sensor includes a parallel beam load cell, one end of which is fixedly connected to the movable seat and the other end of which is fixedly connected to the pressing head.

[0009] Furthermore, the bottom of the pressing head is provided with a protective pad for contacting the surface of the piano keys.

[0010] Furthermore, a counterweight is installed inside the main body of the equipment.

[0011] Furthermore, the main body of the device is equipped with a display screen for displaying the values ​​shown by the displacement sensor and the weight sensor.

[0012] The beneficial effects of this invention are as follows: When testing piano keys, the main body of the device is placed on several keys on one side of the key being tested on the keyboard, with the pressing part on one side of the main body aligned with the key being tested. By driving the movable seat to descend, the pressing part presses down on the key being tested until it touches the bottom. During the downward movement of the movable seat, the descent distance of the movable seat is detected in real time by a displacement sensor, and the force on the pressing part is detected in real time by a gravity sensor. The two types of data are fed back in the form of charts on the display screen or terminal device. The operator can use the distance the movable seat moves between the two time points from the start of the pressing part to the sudden increase in force as the key depth, and can intuitively observe and understand the resistance and changes during the pressing process of the key. The piano key testing is fast and convenient. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of the piano key visualization detection system according to an embodiment of this application during use.

[0014] Figure 2 This is a partial cross-sectional view of the piano key visualization detection system according to an embodiment of this application.

[0015] The components include: 1. Main body of the equipment; 11. Display screen; 2. Movable seat; 21. Transmission block; 3. Driving component; 31. Guide column; 32. Driving screw; 33. Set screw; 4. Pressing part; 41. Protective pad; 5. Displacement sensor; 6. Weight sensor. Detailed Implementation

[0016] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0017] This application discloses a visual detection system for piano keys, referring to... Figure 1 and Figure 2 The device includes a main body 1, which is used to place several piano keys on a keyboard and press those keys down to the bottom of their travel. A movable base 2 is vertically slidably connected inside the main body 1. A drive unit 3 is provided on the main body 1 to drive the movable base 2 to move vertically up and down. A pressing part 4 is connected to the movable base 2 to contact the key being tested downwards. The key being tested is located on one side of the main body 1, and the pressing part 4 extends out of the main body 1 from one side, facing the key being tested. As the drive unit lowers the movable base 2 within the main body 1, the pressing part 4 contacts the key being tested and presses it down to the bottom of its travel. A weight sensor 6 detects the change in force on the pressing part 4 during the movement of the movable base 2, and a displacement sensor 5 detects the distance the movable base 2 moves. By integrating the data on the moving distance of the movable seat 2 with the data on the change of force on the pressing part 4, a data relationship chart between the moving distance of the movable seat 2 and the magnitude of the force on the pressing part 4 is obtained. Based on this chart, the operator can obtain the actual key depth length of the key being tested and the damping magnitude of the key being tested during the action.

[0018] Specifically, when testing the actual key depth of the key being tested, the starting point of the key travel is when the movable seat 2 descends to the point where the pressing part 4 begins to bear force, and the ending point is when the force on the pressing part 4 increases sharply. The distance that the movable seat 2 moves from the starting point to the ending point of the key travel is the actual key depth of the key being tested.

[0019] When testing each key on a piano keyboard, the main body 1 of the device is moved and placed sequentially so that the pressing part 4 aligns with each key from one end of the keyboard to the other, thereby measuring each key individually. When measuring the key on the other side of the keyboard near the end, the main body 1 of the device is rotated horizontally by 180° to complete the measurement of the key on the other side of the keyboard.

[0020] In this embodiment, several guide columns 31 are vertically fixedly installed inside the main body 1 of the device. A guide hole is vertically opened on the movable seat 2, and the guide columns 31 pass through the guide hole, allowing the movable seat 2 to slide vertically. The drive key can be a servo drive motor, which is fixedly installed on the top of the main body 1 by bolts. The output shaft of the servo drive motor faces vertically downwards and is coaxially fixedly connected to a drive screw 32 via a coupling. A clearance groove is vertically opened on the movable seat 2, and a transmission block 21 is fixedly installed on the movable seat 2 above the clearance groove by bolts. The transmission block 21 has a threaded hole adapted to the drive screw 32, and the drive screw 32 passes through the threaded hole and is threadedly connected to it.

[0021] Specifically, the weight sensor 6 can be a parallel beam load cell, and the pressing part 4 can be a pressing head. One end of the parallel beam load cell is fixedly connected to the movable seat 2 by bolts, and the other end extends horizontally to one side of the main body 1 of the equipment and is located above the key being measured. The pressing head is fixed at the bottom of the parallel beam load cell at the end away from the main body 1 of the equipment.

[0022] Furthermore, a protective pad 41 is provided at the bottom of the pressing head for contacting the surface of the piano keys. The protective pad 41 can be made of materials such as rubber or velvet, which can protect the paint layer on the key surface during the pressing of the pressing head. In other embodiments, a rubber layer can also be provided on the ground of the device body 1 to prevent the device body 1 from sliding when placed on the keyboard.

[0023] In this embodiment, to adjust and replace the position sensor and gravity sensor on the movable seat 2, the guide post 31 is detachably installed inside the device body 1. Specifically, a vertical through-hole is provided on the device body 1, and the guide post 31 is movably inserted into the through-hole. Set screws 33 are provided on both the upper and lower sides of the guide post 31, and the set screws 33 are threaded into the through-hole. By disassembling the guide post 31 and the transmission block 21 on the movable seat 2, the movable seat 2 can be removed from the device body 1, thereby allowing for the adjustment and replacement of the position sensor and gravity sensor.

[0024] Furthermore, a counterweight can be installed inside the main body 1 of the device. The counterweight can increase the stability of the main body 1 when it is placed on the piano keyboard, and can effectively press down the keys under the main body 1 completely. When pressing down on the key being tested, the counterweight provides sufficient weight to the main body 1, so that the gravity of the main body 1 is much greater than the pressing force of the key being tested. This eliminates the influence of the rebound force of the key under the main body 1 on the damping detection of the key being tested, and allows the gravity sensor to detect the sharp increase in resistance after the key being tested touches the bottom.

[0025] Furthermore, a display screen 11 is also provided on the main body 1 to display the values ​​displayed by the displacement sensor 5 and the weight sensor 6. Specifically, a power module and a control processor can be installed inside the main body 1. The control processor includes a processing module integrated on the PCB board. The power module is electrically connected to the servo drive motor, gravity sensor, displacement sensor 5, control processor, and display screen 11, and supplies power to the various electronic components in the system. The control processor is also electrically connected to the servo drive motor, gravity sensor, displacement sensor 5, and display screen 11. Through program control, when the servo drive motor starts and drives the movable seat 2 to descend, the gravity sensor and displacement sensor 5 detect the resistance received by the pressing part 4 and the descending distance of the movable seat 2 in real time, and transmit the data to the control processor. When the control processor detects a sharp increase in the resistance measured by the gravity sensor, the control processor controls the servo drive motor to stop immediately to prevent the pressing part 4 from continuing to press the key. The control processor then displays the measured displacement distance of the movable seat 2 and the resistance received by the pressing part 4 in graphical or numerical form on the display screen 11. In other embodiments, a wireless communication module may also be integrated on the control processor, enabling the system to wirelessly connect with terminals such as computers and mobile phones via Bluetooth or Wi-Fi communication, and display the measured values ​​on the terminal device. Those skilled in the art will understand that although preferred embodiments of the present invention have been described, those skilled in the art, once they understand the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention. Obviously, those skilled in the art can make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention also intends to include these modifications and variations.

Claims

1. A visual detection system for piano keys, characterized in that: The device includes a main body (1) that lays flat and presses down several piano keys. A movable seat (2) is vertically slidably arranged inside the main body (1). A driving component (3) is provided on the main body (1) for driving the movable seat (2) to move vertically up and down. A pressing part (4) for contacting the key being tested downward is connected to the movable seat (2). A displacement sensor (5) for detecting the moving distance of the movable seat (2) is provided on the movable seat (2). A weight sensor (6) is provided on the pressing part (4).

2. The piano key visualization detection system according to claim 1, characterized in that, The driving component (3) includes a servo drive motor. Several guide columns (31) are vertically fixed inside the main body (1). The movable seat (2) is vertically slidably connected to the guide columns (31). The servo drive motor is fixedly installed on the top of the main body (1). The output end of the servo drive motor is coaxially fixedly connected to a drive screw (32). A transmission block (21) is fixedly installed on the movable seat (2). A threaded hole is opened on the transmission block (21). The drive screw (32) is threadedly connected to the threaded hole.

3. The piano key visualization detection system according to claim 2, characterized in that, The pressing part (4) includes a pressing head, and the weight sensor (6) includes a parallel beam load cell. One end of the parallel beam load cell is fixedly connected to the movable seat (2), and the other end is fixedly connected to the pressing head.

4. The piano key visualization detection system according to claim 3, characterized in that, The bottom end of the pressing head is provided with a protective pad (41) for contacting the surface of the piano keys.

5. The piano key visualization detection system according to claim 1, characterized in that, A counterweight is provided inside the main body (1) of the equipment.

6. The piano key visualization detection system according to any one of claims 1 to 5, characterized in that, The main body (1) of the device is provided with a display screen (11) for displaying the values ​​of the displacement sensor (5) and the weight sensor (6).

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