Remote digital control gravity acceleration measuring device

Abstract

The utility model discloses a remote numerical control gravity acceleration measuring device, its characterized in that: still include the positioning drive mechanism for pushing the spheroid and make the spheroid drive line object and vertical pole form the preset swing angle, the period detection mechanism for automatically detecting the swing period when the spheroid swings, several remote network cameras for monitoring the experiment process are arranged at different positions and control system that respectively controls the positioning drive mechanism, period detection mechanism and remote network camera operation, motor can control drive baffle to carry out the action of slow -moving and fast withdrawal, the utility model discloses the accurate positioning of drive baffle on the linear guide rail through control system coordination motor, has realized the automatic, accurate setting of spheroid initial swing angle, thoroughly eliminated the artificial operation error and randomness that traditional manual release spheroid brought, simultaneously, period detection mechanism has realized the automatic detection to swing period, effectively avoided the subjective error and reaction delay of manual timing.

Description

Technical Field

[0001] This utility model relates to the field of physical experimental instrument technology, specifically to a remote numerical control gravity acceleration measuring device. Background Technology

[0002] Gravitational acceleration is a core fundamental parameter in physics, and its measurement accuracy directly affects the reliability of physical experiment results. Traditional pendulum methods for measuring gravitational acceleration have many limitations: on the one hand, they rely on manual adjustment of the pendulum angle and manual timing and counting, which are easily affected by human operational errors, resulting in low measurement accuracy; on the other hand, the experiment requires on-site operation by the experimenter, which cannot meet the needs of remote teaching and cross-regional experimental sharing.

[0003] While some existing CNC-controlled improved devices have achieved basic automation, they still suffer from problems such as inconvenient pendulum length adjustment and insufficient pendulum angle control precision. Furthermore, they lack multi-dimensional experimental monitoring methods, making it difficult to balance measurement accuracy with the visualization requirements of experimental teaching. Therefore, a remote CNC gravitational acceleration measuring device is proposed. Utility Model Content

[0004] The purpose of this invention is to provide a remote numerical control gravity acceleration measuring device to solve the above problems.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a remote numerically controlled gravity acceleration measuring device, comprising a base, a vertical pole perpendicular to the base, a linear object with one end mounted on the pole and extending vertically to the base, and a spherical object connected to the other end of the linear object. The device is characterized by further comprising: a positioning drive mechanism for pushing the spherical object and causing the spherical object to drive the linear object to form a preset swing angle with the pole; a period detection mechanism for automatically detecting the swing period of the spherical object during its swing; several remote network cameras deployed at different locations for monitoring the experimental process; and a control system for controlling the operation of the positioning drive mechanism, the period detection mechanism, and the remote network cameras respectively. The positioning drive mechanism includes a linear guide rail mounted on the base, a drive baffle slidably connected to the linear guide rail for pushing the spherical object and causing the spherical object to drive the linear object to form a preset swing angle with the pole and / or blocking the swing of the spherical object, a motor for driving the drive baffle to move along the linear guide rail, and a position detection unit for detecting the extreme position of the drive baffle's movement.

[0006] More preferably, the speed at which the motor drives the drive baffle to reset is greater than the speed at which the drive baffle pushes the spherical object, causing the spherical object to drive the linear object and the upright to form a preset swing angle.

[0007] A further preferred embodiment includes a slider slidably connected to the linear guide rail, a mounting plate disposed on the slider and connected to the drive baffle, and a cable chain connected to the mounting plate for protecting and guiding the cable during movement.

[0008] More preferably, the periodic detection mechanism is a laser photoelectric gate installed on the base to detect the swing of the sphere and generate a signal to be transmitted to the control system; the position detection unit is a limiting photoelectric gate installed at at least one end of the linear guide rail.

[0009] A further preferred embodiment includes a detachable light-blocking needle disposed at the bottom of the sphere for accurately counting by triggering a laser photoelectric gate during the sphere's swing.

[0010] More preferably, the control system is equipped with a touch screen, several interfaces electrically connected to the laser photoelectric gate, the limit photoelectric gate, the motor, and the remote network camera, and a data communication interface for data transmission and network communication.

[0011] More preferably, the base is provided with several cable sockets for connecting the laser photoelectric gate, the limit photoelectric gate, and the cables between the motor and the control system.

[0012] More preferably, the base is provided with at least one camera bracket for mounting a remote network camera.

[0013] More preferably, the remote network camera includes a first camera mounted on a mounting plate for monitoring the swaying stroke of the sphere, a second camera mounted on a camera bracket for monitoring the control system's operating interface, and a third camera mounted on top of the camera bracket for overhead monitoring of the entire swaying process of the sphere.

[0014] More preferably, the upright is provided with a telescopic rod, the top of which is provided with a horizontally extending support arm, and the upright is also provided with a thread-like object winding and unwinding wheel for winding the thread-like object and adjusting its hanging length.

[0015] The beneficial effects of this invention are as follows: By coordinating the precise positioning of the drive baffle on the linear guide rail with the motor through the control system, the initial swing angle of the sphere is automatically and accurately set, completely eliminating the human error and randomness caused by the traditional manual release of the sphere; at the same time, the period detection mechanism realizes the automatic detection of the swing period, effectively avoiding the subjective error and reaction delay of manual timing; in addition, several remote network cameras deployed at key locations form a comprehensive visual monitoring network, which not only makes the experimental process completely transparent to the operator and supports remote real-time observation, but also provides intuitive and reliable evidence for experimental process review, anomaly diagnosis and teaching analysis based on the recorded image data; the coordinated work of each system ensures the high repeatability and high accuracy of the gravity acceleration measurement results. By using cable chains, systematic protection is provided for all cables involved in reciprocating motion in the device, effectively solving the problem of easy wear and fatigue breakage of cables in automated reciprocating motion equipment. This significantly improves the operational reliability, long-term durability, and safety of the entire positioning drive mechanism and even the entire device. At the same time, the standardized cable arrangement facilitates daily inspection and maintenance, extends the service life of critical cables, and reduces the risk of system downtime and long-term maintenance costs caused by cable failures. By setting up the light-blocking needle, compared with directly triggering the photogate with the edge of a spherical object, the slender cylindrical needle provides a narrow light-blocking section with a very clear geometric definition, making the criteria for the "blocking" and "recovery" of the laser beam very clear. This fundamentally reduces the timing error caused by diffuse reflection of the light spot and blurred edge recognition, thereby greatly improving the measurement accuracy and repeatability of the period. By setting up a remote experimental platform, complex physical experimental devices are transformed into intuitive online operation interfaces. Through the online closed loop of "parameter setting - command execution - process monitoring - data acquisition", it not only facilitates remote observation and operation, but also realizes the sharing of experimental resources, greatly improving equipment utilization and teaching efficiency, and providing advanced technical support for modern experimental teaching. By combining the coarse adjustment of the telescopic rod with the fine adjustment of the string retraction wheel, the pendulum length can be adjusted quickly, accurately, and over a wide range, meeting the diverse needs of different experimental schemes for pendulum length and effectively avoiding the inconvenience of frequently changing pendulum strings or climbing to adjust it. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the assembly structure of the base, upright, linear object, and spherical object of this utility model; Figure 3 This is a partial enlarged view of the present invention; Figure 4 This is a schematic diagram of the assembly structure of the positioning drive mechanism, the periodic detection mechanism, and the remote network camera of this utility model; Figure 5 This is a schematic diagram of the assembly structure of the positioning drive mechanism, periodic detection mechanism and remote network camera of this utility model from another perspective. Figure 6 This is a schematic diagram of the control system structure of this utility model; Figure 7 This is a schematic diagram of the spherical structure of this utility model.

[0017] Legend: 1. Base; 2. Upright pole; 21. Telescopic pole; 22. Support arm; 23. Linear object take-up and take-off wheel; 3. Linear object; 4. Spherical object; 41. Light-blocking pin; 5. Positioning drive mechanism; 51. Linear guide rail; 52. Drive baffle; 53. Motor; 54. Slider; 55. Mounting plate; 56. Cable chain; 57. Limit photoelectric gate; 58. Cable socket; 59. Camera bracket; 6. Periodic detection mechanism; 7. Remote network camera; 71. First camera; 72. Second camera; 73. Third camera; 8. Control system; 81. Touch screen; 82. Interface; 83. Data communication interface. Detailed Implementation

[0018] The following description, in conjunction with the accompanying drawings, further illustrates the remote numerical control gravity acceleration measuring device of this utility model.

[0019] It should be noted that all directional indicators such as up, down, left, right, front, back, etc. in the embodiments of this utility model are only used to explain the relative positional relationship and movement of the components in a specific posture as shown in the attached figure. If the specific posture changes, the directional indicator will also change accordingly.

[0020] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly; for example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0021] See Figures 1-7As shown, a remote numerically controlled gravity acceleration measuring device includes a base 1, a pole 2 perpendicular to the base 1, a linear object 3 with one end mounted on the pole 2 and extending perpendicularly to the base 1, and a spherical object 4 connected to the other end of the linear object 3. The device is characterized by further including a positioning drive mechanism 5 for pushing the spherical object 4 and causing the spherical object 4 to drive the linear object 3 to form a preset swing angle with the pole 2, a period detection mechanism 6 for automatically detecting the swing period of the spherical object 4, several remote network cameras 7 deployed at different locations for monitoring the experimental process, and a control system 8 for controlling the operation of the positioning drive mechanism 5, the period detection mechanism 6, and the remote network cameras 7 respectively. The positioning drive mechanism 5 includes a linear guide rail 51 mounted on the base 1, a drive baffle 52 slidably connected to the linear guide rail 51 for pushing the spherical object 4 and causing the spherical object 4 to drive the linear object 3 to form a preset swing angle with the pole 2 and / or blocking the swing of the spherical object 4, a motor 53 for driving the drive baffle 52 to move along the linear guide rail 51, and a position detection unit for detecting the extreme position of the drive baffle 52.

[0022] The upright 2 is vertically fixed to the base 1 by welding or threaded connection to ensure the overall structure is stable. The upper end of the linear object 3 is locked by the spool of the linear object take-up and release wheel 23, or by the wire clamp or wire screw with locking function set on the upright 2. Its lower end is firmly connected to the spherical object 4 by threaded connection, quick-release connector, clamp locking or knot binding, etc., to ensure stable and reliable connection during the entire swing process, without slippage or loosening. The base 1 is made of aluminum alloy profile and can be designed as an integral or split piece, such as two independently set pieces, for easy placement on the experimental table. Its surface is provided with a scale for intuitive observation of the movement stroke of the drive baffle 52. The drive baffle 52 is a rigid plate with an arc groove or V-groove. Its structure can stably fit the surface of the spherical object 4, thereby effectively restricting and pushing the movement of the spherical object 4 during the movement, and can stop the swinging spherical object 4 when needed.

[0023] The motor 53 is a stepper motor or a servo motor. Its output end is connected to the drive baffle 52 through a synchronous belt and pulley transmission mechanism or a screw and nut mechanism to drive it to move precisely on the linear guide rail 51.

[0024] The remote network camera 7 is a high-definition camera that supports PoE power supply. Its deployment position can cover the control interface of the control system 8, the complete swing process of the sphere 4, and the movement and positioning status of the drive baffle 52, so as to realize all-round and multi-angle monitoring of the experimental process. The control system 8 integrates a high-precision timing module and a counting module. The motor 53 is preferably a stepper motor. Its output end is connected to the drive baffle 52 through a set of synchronous belt and pulley transmission mechanism (or an alternative screw and nut mechanism) to drive it to move precisely on the linear guide rail 51.

[0025] The period detection mechanism 6 is a laser photoelectric gate, which is set on the base 1 and located near the lowest point of the swing trajectory of the spherical object 4. When the spherical object 4 swings to the vicinity of the lowest point, the spherical object 4 passes vertically through the light beam emitted by the period detection mechanism 6, generating a light-blocking pulse signal and transmitting it to the control system 8. The control system 8 uses its internal high-precision timing module and counting module to accurately record the time and number of pulse occurrences, and then calculates the swing period of the pendulum based on the time interval between two consecutive pulse signals. To improve accuracy, it can also calculate the average value based on the data of multiple consecutive periods, and monitor the total number of swings to meet the preset experimental requirements.

[0026] The position detection unit is a limiting photoelectric gate 57 set at both ends of the linear guide rail 51, which is used to limit the physical limit position of the drive baffle 52. When the drive baffle 52 moves to the end of the linear guide rail 51 and triggers the limiting photoelectric gate 57, the limiting photoelectric gate 57 sends a signal to the control system 8, and the control system 8 then controls the motor 53 to stop running, thereby preventing the mechanism from overshooting, realizing hardware-level safety protection, and can be used for system origin calibration.

[0027] By coordinating the motor 53 to drive the baffle 52 to precisely position on the linear guide rail 51, the control system 8 achieves automatic and precise setting of the initial swing angle of the sphere 4, completely eliminating the human error and randomness caused by the traditional manual release of the sphere 4. At the same time, the period detection mechanism 6 realizes automatic detection of the swing period, effectively avoiding the subjective error and reaction delay of manual timing. In addition, several remote network cameras 7 deployed at key locations form a comprehensive visual monitoring network, which not only makes the experimental process completely transparent to the operator and supports remote real-time observation, but also provides intuitive and reliable evidence for experimental process review, anomaly diagnosis and teaching analysis. The collaborative work of each system ensures the high repeatability and high accuracy of the gravity acceleration measurement results.

[0028] See appendix Figure 1-2 As shown in Figures 4-5, the speed at which the motor 53 drives the drive baffle 52 to reset is greater than the speed at which the drive baffle 52 pushes the spherical object 4, causing the spherical object 4 to drive the linear object 3 to form a preset swing angle with the upright 2.

[0029] The motor 53 is driven by the control system 8 and has a programmable multi-speed control function. When performing the "set swing angle" action, the control system 8 controls the motor 53 to run at the first speed, driving the baffle 52 to smoothly approach and push the spherical object 4, so that the spherical object 4 drives the linear object 3 to deflect smoothly until the linear object 3 and the upright 2 reach a preset angle. After the angle is set, the control system 8 immediately controls the motor 53 to switch to a higher second speed, driving the baffle 52 to quickly withdraw from the contact position with the spherical object 4 and return to its initial standby position.

[0030] This speed control strategy enables precise and stable control of the sphere 4 during the swing angle setting phase, avoiding impacts or swaying due to excessive speed. Simultaneously, it enables rapid retraction during the reset phase, minimizing the interference of the drive baffle 52 on the sphere 4's upcoming free swing motion. This ensures the consistency of the initial conditions for the pendulum's oscillation and the accuracy of subsequent period measurement data.

[0031] In one embodiment, the system further includes a slider 54 slidably connected to the linear guide rail 51, a mounting plate 55 disposed on the slider 54 and connected to the drive baffle 52, and a cable chain 56 connected to the mounting plate 55 for protecting and guiding the cable during movement.

[0032] The linear guide rail 51 is also equipped with mechanical limit switches at both ends, which cooperate with the triggering components on the slider 54 or mounting plate 55 to provide a mechanical stop for the final stroke. This mechanical stop structure serves as a redundant safety measure in addition to the electrical signal protection of the aforementioned limit photoelectric gate 57. It can physically prevent the drive baffle 52 from overtravel impact or derailment risk in the event of sensor failure or control system 8 malfunction, thereby greatly enhancing the safety of the mechanism's operation.

[0033] The mounting plate 55 is fixed to the slider 54 by bolts, and the drive baffle 52 is mounted on the mounting plate 55 by bolts. The mounting plate 55 acts as the hub for force transmission and structural connection, accurately transmitting the linear motion of the slider 54 to the drive baffle 52. The drag chain 56 is made of engineering plastic or metal, and its internal connection space is used to orderly accommodate and bind the cables that move with the drive baffle 52, such as the power cord and signal line of the remote network camera 7.

[0034] When the motor 53 drives the slider 54 to move via the synchronous belt, the slider 54 drives the mounting plate 55 and the drive baffle 52 to move as a whole. At the same time, the drag chain 56 connected to the mounting plate 55 will expand or retract synchronously, like a retractable tank track. During this process, the cable placed in the drag chain 56 is restricted to move within a set bending radius, thereby effectively avoiding scratching or tangling with surrounding parts, or damage to the wire core due to excessive bending.

[0035] By using cable chain 56, systematic protection is provided for all cables involved in reciprocating motion in the device, effectively solving the problem of easy wear and fatigue breakage of cables in automated reciprocating motion equipment. This significantly improves the operational reliability, long-term durability, and safety of the entire positioning drive mechanism 5 and even the entire device. At the same time, the standardized cable arrangement facilitates daily inspection and maintenance, extends the service life of critical cables, and reduces the risk of system downtime and long-term maintenance costs caused by cable failures.

[0036] Participation Figure 1 , 4 As shown in Figure 5, the period detection mechanism 6 is a laser photoelectric gate installed on the base 1 to detect the swing of the spherical object 4 and generate a signal to be transmitted to the control system 8; the position detection unit is a limiting photoelectric gate 57 installed at at least one end of the linear guide rail 51.

[0037] The period detection mechanism 6 is a laser photoelectric gate, with its transmitter and receiver positioned opposite each other on the base 1, located on either side of the lowest point of the spherical object 4's swing trajectory. When the spherical object 4 swings past, the light-blocking plate 41 at its bottom blocks the light beam, generating a light-blocking pulse signal that is transmitted to the control system 8 for precise calculation of the swing period. In addition to the laser photoelectric gate, the period detection mechanism 6 can also use an infrared photoelectric gate or an image recognition sensor to achieve similar functions. The position detection unit is a limit photoelectric gate 57, which is located at both ends of the linear guide rail 51. When the drive baffle 52 moves to the end of its stroke and triggers the limit photoelectric gate 57, the signal instructs the control system 8 to immediately stop the motor 53 to prevent overshoot, achieving hardware safety protection and allowing for system origin calibration. In addition to the limit photoelectric gate 57, the position detection unit can also use a mechanical limit switch or a Hall sensor to achieve position detection and limit functions.

[0038] See appendix Figure 1 , 6 As shown, the control system 8 is equipped with a touch screen 81, several interfaces 82 that are electrically connected to the laser photoelectric gate, the limit photoelectric gate 57, the motor 53 and the remote network camera 7, and a data communication interface 83 for data transmission and network communication.

[0039] The control system 8 integrates a microprocessor module, a high-precision timing module, a data storage module, and a network communication module; its motion control logic, data acquisition process, and gravity acceleration calculation algorithm are all stored in the internal memory. During operation, the microprocessor of the control system 8 sends control commands to the motor 53 via interface 82, driving the drive baffle 52 to move to the preset swing angle position. Simultaneously, it acquires the trigger signal of the laser photoelectric gate in real time via interface 82, and based on the internal high-precision timing module, accurately times the complete swing period defined by the trigger signal, thereby calculating the pendulum period. Furthermore, the control system 8 performs unified scheduling and coordinated control of each remote network camera 7 via interface 82. Additionally, the touchscreen 81 serves as a local human-machine interface, used to input experimental parameters such as the preset swing angle and the number of cycles to be measured, control the start and stop of the experiment, and display test data including the swing period and the calculated gravitational acceleration, as well as the system's operating status in real time. The data communication interface 83 supports communication protocols such as Ethernet, USB, or Wi-Fi. Finally, the control system 8 establishes a high-speed network connection with the host computer or remote experimental platform via the data communication interface 83, enabling remote distribution of experimental parameters, remote transmission of real-time measurement data, and cloud storage, thus fully realizing the device's remote numerical control, centralized data management, and process visualization functions.

[0040] See appendix Figure 1 , 4 As shown, the base 1 is provided with several cable sockets 58 for connecting the laser photoelectric gate, the limit photoelectric gate 57 and the motor 53 to the control system 8; the cable sockets 58 serve as the hub for cable connection and are mainly used to achieve a reliable and neat electrical connection between the laser photoelectric gate, the limit photoelectric gate 57 and the motor 53 and the control system 8.

[0041] During on-site deployment or maintenance, operators only need to connect the cable plugs of the laser photoelectric gate, limit photoelectric gate 57, and motor 53 to the corresponding cable sockets 58 on the base 1; simultaneously, connect the main cable bundle from the control system 8 to the other end of the cable socket 58. The centralized cable socket 58 design allows for a continuous, clean, and reliable transmission path for signals and control commands from the execution unit and sensing unit, as well as the power supply provided to them. When the equipment needs to be moved or maintained, simply unplugging the corresponding cable socket 58 allows for quick separation of each module, eliminating the need for complex independent wiring systems. This significantly improves equipment deployment efficiency, reduces installation and maintenance difficulty, and ensures repeatability and reliability of connections.

[0042] In one embodiment, a remote experimental platform is also included, which is connected to the network and control system 8 for remote monitoring and operation of the experimental process. The remote experimental platform is a software system that integrates equipment control, real-time monitoring, data management and experimental report generation, and is deployed on a cloud server. Users can access it through a standard web browser on terminal devices such as personal computers, tablets or mobile phones, realizing the full remote and digitalization of the experimental process.

[0043] During remote operation, the control system 8 is in a network-ready state. Users can directly set experimental parameters such as swing angle and number of swing periods on the provided virtual control panel via the web interface of the remote experimental platform, and remotely trigger the "Experiment Preparation" and "One-Click Release" commands. The network communication module within the control system 8 receives these commands in real time, and its microprocessor drives the motor 53 and drive baffle 52 to precisely execute the positioning, pushing, and releasing actions of the spherical object 4.

[0044] During the experiment, users can simultaneously and from multiple angles observe the swing state of the sphere 4, the movement process of the drive baffle 52, and the real-time data changes on the control system 8's operating interface through the live stream of multiple remote network cameras 7 integrated into the platform interface. Users can focus and magnify any camera image to obtain a clear view of key details, thereby achieving immersive remote monitoring and process retrospective analysis. In particular, by observing the monitoring screen of the specially photographed base 1 scale, users can remotely and accurately monitor and quantitatively verify the actual movement distance and preset position of the drive baffle 52, ensuring the accuracy of the experimental conditions.

[0045] The periodic data measured by the laser photoelectric gate is uploaded to the remote experimental platform by the control system 8. The remote experimental platform automatically completes the data processing based on the preset algorithm, calculates and displays the measurement results of gravitational acceleration in real time, and records the complete experimental parameters, periodic sequence and calculation results in the structured database, so that users can query, export data or generate a standardized experimental report at any time.

[0046] By setting up a remote experimental platform, complex physical experimental devices are transformed into intuitive online operation interfaces. Through the online closed loop of "parameter setting - command execution - process monitoring - data acquisition", it not only facilitates remote observation and operation, but also realizes the sharing of experimental resources, greatly improving equipment utilization and teaching efficiency, and providing advanced technical support for modern experimental teaching.

[0047] See appendix Figure 1 , 4As shown in Figure 5, the base 1 is provided with at least one camera bracket 59 for mounting a remote network camera 7; the remote network camera 7 includes a first camera 71 mounted on the mounting plate 55 for monitoring the swing stroke of the sphere 4, a second camera 72 mounted on the camera bracket 59 for monitoring the operation interface of the control system 8, and a third camera 73 mounted on the top of the camera bracket 59 for overhead shooting to monitor the entire swing process of the sphere 4.

[0048] The camera bracket 59 is securely fixed to a specific position on the base 1 via bolts or welding. The camera bracket 59 primarily supports and positions the second camera 72 and the third camera 73. By precisely adjusting the mounting height, pitch angle, and horizontal orientation of the second and third cameras 72 and 73 on the camera bracket 59, it coordinates with the first camera 71 fixed on the mounting plate 55 to form a complete multi-view visual monitoring system. This system covers the entire experimental area from multiple dimensions, including side, front, and top views, thereby achieving comprehensive, real-time monitoring of the complete swing process of the sphere 4, the movement trajectory of the drive baffle 52, and the control system 8's operating interface. The remote network camera 7 can be directly screwed into the corresponding pre-set screw holes on the camera bracket 59 or mounting plate 55 via its standard threaded interface at the bottom, or it can be quickly installed, accurately reset, and easily disassembled via a quick-release plate or other universal accessory mechanism to adapt to different deployment needs and maintenance scenarios.

[0049] See appendix Figure 1-3 As shown, the upright 2 is provided with a telescopic rod 21, and the top of the telescopic rod 21 is provided with a horizontally extending support arm 22. The upright 2 is also provided with a wire winding wheel 23 for winding the wire 3 and adjusting its hanging length.

[0050] The telescopic rod 21 adopts a sleeve-type or spiral-type telescopic design, and its outer wall is provided with a fastening knob or pin hole; when the telescopic rod 21 is stretched or compressed to the required height, the position can be fixed by tightening the knob or inserting the pin, thereby completing the stepless or stepped adjustment of the total height of the upright 2; the support arm 22 is fixed to the top of the telescopic rod 21 by welding or flange connection, and its end is suspended in the air with no obstruction directly below, providing sufficient space for pendulum swing; the support arm 22 is equipped with a guide and modification device. A fixed pulley for the variable direction of the linear object 3; the linear object take-up and release wheel 23 is mounted on the upright 2 via a bracket and is positioned lower than the support arm 22; the linear object take-up and release wheel 23 has a built-in damping and line length locking mechanism; one end of the linear object 3 is fixed to the linear object 3 take-up and release wheel, the line extends upward and passes over the fixed pulley on the support arm 22 and then vertically downward to connect to the spherical object 4; the locking mechanism of the linear object take-up and release wheel 23 can be a friction brake or a ratchet mechanism, used to reliably lock the length of the linear object 3 after the pendulum length adjustment is completed.

[0051] Before the experiment, the height of the support arm 22 is adjusted by loosening the fastening knob or pin hole of the telescopic rod 21 and adjusting its height, thus achieving a large-scale coarse adjustment of the pendulum length; after adjustment, it is locked and fixed. On this basis, by rotating the handle of the line take-up and release wheel 23 to take in or release the line 3, the effective length of the pendulum line can be precisely adjusted to the millimeter level without changing the height of the upright rod 2; after adjusting to the target length, the line length is reliably locked by triggering the locking mechanism of the line take-up and release wheel 23.

[0052] By combining the coarse adjustment of the telescopic rod 21 with the fine adjustment of the string retraction wheel 23, the pendulum length can be adjusted quickly, accurately, and over a wide range, meeting the diverse needs of different experimental schemes for pendulum length and effectively avoiding the inconvenience of frequently changing pendulum strings or climbing to adjust it.

[0053] When in use, this utility model has both local operation and remote control modes.

[0054] During local operation, the user can operate directly on the touch screen 81 of the control system 8. First, the length of the linear object 3 is precisely adjusted by the cooperation of the linear object take-up wheel 23 and the telescopic rod 21 to set the required pendulum length. Then, the target pendulum angle and the number of measurement cycles are input on the touch screen 81, and the "Experiment Preparation" button is clicked. The control system 8, i.e., the drive motor 53, drives the drive baffle 52 to move along the linear guide rail 51 through the synchronous belt transmission, precisely pushing the spherical object 4 to the specified angle. After preparation, the "One-Key Release" button is clicked, the drive baffle 52 is quickly moved away, and the spherical object 4 begins to perform a simple pendulum motion. When the spherical object 4 swings to the lowest point, the light-blocking needle 41 at its bottom will pass through the laser beam of the laser photoelectric gate, generating a light-blocking pulse signal. This signal is synchronously collected by the control system 8, and its internal high-precision timing module accurately measures the time interval between two consecutive light-blocking signals and the cumulative number of light-blocking times by the counting module. Based on this, the swing period is calculated, and the gravitational acceleration value is automatically calculated. The measurement results are displayed on the touch screen 81 in real time and can be manually saved.

[0055] During remote operation, the user logs into the remote experimental platform via the network. The operation process is consistent with the local touchscreen 81. After setting parameters such as swing angle and period on the web interface, the user clicks the corresponding virtual button, and the command is sent to the control system 8 via the network. The drive device executes the same "experiment preparation" and "one-click release" process as the local operation. At the same time, the second camera 72 and the third camera 73 mounted on the camera bracket 59 and the first camera 71 mounted on the mounting plate 55 transmit real-time images of the experimental site to the remote platform. The images include the overall status of the equipment, the complete swing process and stroke of the sphere 4, and the interface display of the control system 8, for the user to observe and monitor. All experimental data, such as period and gravitational acceleration, are automatically uploaded to the platform, allowing users to view and save data online and generate standard format experimental reports with one click.

[0056] When it is necessary to stop the swaying of the sphere 4 after the experiment, the motor 53 can be started by the control system 8. The motor 53 drives the slider 54 to move along the linear guide rail 51 through the synchronous belt drive. The mounting plate 55 is rigidly connected to the slider 54 and drives the drive baffle 52 fixed on it to move together, so that the drive baffle 52 accurately enters the swaying trajectory range of the sphere 4. When the sphere 4 swings close to the drive baffle 52, its spherical surface collides with the arc-shaped groove or V-shaped groove contact surface of the drive baffle 52. Through friction and energy transfer, the kinetic energy of the sphere 4 is quickly dissipated, thereby achieving smooth and rapid forced braking.

[0057] The scope of protection of this utility model is not limited to the above embodiments and their variations. Conventional modifications and substitutions made by those skilled in the art based on the content of these embodiments are all within the scope of protection of this utility model.

Claims

1. A remote numerically controlled gravitational acceleration measuring device, comprising a base (1), a vertical rod (2) perpendicular to the base (1), a linear object (3) with one end mounted on the vertical rod (2) and extending perpendicularly to the base (1), and a spherical object (4) connected to the other end of the linear object (3), characterized in that: It also includes a positioning drive mechanism (5) for pushing the sphere (4) and causing the sphere (4) to drive the line (3) to form a preset swing angle with the pole (2), a period detection mechanism (6) for automatically detecting the swing period of the sphere (4) when it swings, several remote network cameras (7) set up at different locations for monitoring the experimental process, and a control system (8) for controlling the operation of the positioning drive mechanism (5), the period detection mechanism (6) and the remote network cameras (7) respectively; the positioning drive mechanism (5) includes a linear guide rail (51) set on the base (1), a drive baffle (52) slidably connected to the linear guide rail (51) for pushing the sphere (4) and causing the sphere (4) to drive the line (3) to form a preset swing angle with the pole (2) and / or blocking the swing of the sphere (4), a motor (53) for driving the drive baffle (52) to move along the linear guide rail (51), and a position detection unit for detecting the extreme position of the drive baffle (52).

2. The remote numerical control gravity acceleration measuring device according to claim 1, characterized in that: The speed at which the motor (53) drives the drive baffle (52) to reset is greater than the speed at which the drive baffle (52) pushes the spherical object (4) to cause the spherical object (4) to drive the linear object (3) to form a preset swing angle with the upright (2).

3. The remote numerical control gravity acceleration measuring device according to claim 1, characterized in that: It also includes a slider (54) slidably connected to the linear guide (51), a mounting plate (55) disposed on the slider (54) and connected to the drive baffle (52), and a cable chain (56) connected to the mounting plate (55) for protecting and guiding the cable during movement.

4. The remote numerical control gravity acceleration measuring device according to claim 1, characterized in that: The periodic detection mechanism (6) is a laser photoelectric gate installed on the base (1) to detect the swing of the sphere (4) and generate a signal to be transmitted to the control system (8); the position detection unit is a limiting photoelectric gate (57) installed at at least one end of the linear guide rail (51).

5. The remote numerical control gravity acceleration measuring device according to claim 1, characterized in that: It also includes a detachable light-blocking needle (41) located at the bottom of the sphere (4) for accurately counting by triggering the laser photoelectric gate during the swing of the sphere (4).

6. The remote numerical control gravity acceleration measuring device according to claim 4, characterized in that: The control system (8) is equipped with a touch screen (81), several interfaces (82) electrically connected to the laser photoelectric gate, the limit photoelectric gate (57), the motor (53) and the remote network camera (7), and a data communication interface (83) for data transmission and network communication.

7. The remote numerical control gravity acceleration measuring device according to claim 6, characterized in that: The base (1) is provided with several cable sockets (58) for connecting the laser photoelectric gate, the limit photoelectric gate (57) and the motor (53) to the control system (8).

8. A remote numerically controlled gravity acceleration measuring device according to claim 1 or 3, characterized in that: The base (1) is provided with at least one camera bracket (59) for mounting a remote network camera (7).

9. A remote numerically controlled gravity acceleration measuring device according to claim 8, characterized in that: The remote network camera (7) includes a first camera (71) mounted on a mounting plate (55) for monitoring the swing stroke of the sphere (4), a second camera (72) mounted on a camera bracket (59) for monitoring the operation interface of the control system (8), and a third camera (73) mounted on the top of the camera bracket (59) for overhead shooting to monitor the entire swing process of the sphere (4).

10. A remote numerically controlled gravity acceleration measuring device according to claim 1, characterized in that: The pole (2) is provided with a telescopic rod (21), and the top of the telescopic rod (21) is provided with a horizontally extending support arm (22). The pole (2) is also provided with a wire winding wheel (23) for winding the wire (3) and adjusting its hanging length.

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