Intelligent evaluation system for grappling training and force sensing electronic sandbag

Abstract

The application relates to the technical field of sandbags, in particular to an intelligent evaluation system for enemy capturing and wrestling training and a force sensing electronic sandbag, which comprises four parts from top to bottom, namely an upper unit, a middle unit, a lower unit and a bottom unit; the four parts are arranged with armored force sensing modules; the armored force sensing module comprises, from outside to inside, a buffer layer, a hard uniform force plate, an air bag layer and a metal bottom box; the metal bottom box is internally provided with an electronic acquisition box; the force sensing electronic sandbag is designed in a modular armored mode, the upper, middle, lower and bottom parts of the electronic sandbag are all provided with detachable armored force sensing modules, local damage does not require overall replacement, on-demand maintenance is realized, and the maintenance cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of sandbag technology, specifically to an intelligent assessment system for combat training and a force-sensing electronic sandbag. Background Technology

[0002] Existing intelligent striking data acquisition devices used for combat and grappling training mostly employ rigid force / pressure sensors directly placed inside sandbags to collect force data. While these devices can record some basic striking data, they still have many technical shortcomings. For example, the method of directly sensing striking force using rigid force / pressure sensors is easily affected by the striking angle. When the striking angle is tilted relative to the sensor's detection angle, a component force is generated, reducing detection accuracy. Secondly, the sensing structure is usually an integrated design without modular disassembly capabilities. If a part is damaged, the entire device must be replaced, resulting in low maintenance efficiency. Furthermore, these devices cannot meet the professional training and assessment needs of multi-movement, multi-angle training scenarios in combat and grappling. Summary of the Invention

[0003] The purpose of this invention is to provide an intelligent assessment system for combat training and a force-sensing electronic sandbag to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a force-sensing electronic sandbag, comprising four parts from top to bottom: an upper unit, a middle unit, a lower unit, and a bottom unit. Each of the four parts is equipped with an armored force-sensing module. The armored force-sensing module includes, from the outside to the inside, a buffer layer, a rigid force-equalizing plate, an airbag layer, and a metal base box. An electronic acquisition box is installed inside the metal base box. The electronic acquisition box is connected to the airbag layer via an air tube. The electronic acquisition box collects the instantaneous air pressure change value inside the airbag layer in real time. When the buffer layer is hit, pressure is applied to the airbag layer through the rigid force-equalizing plate. The impact force is determined based on the instantaneous air pressure change value inside the airbag layer.

[0005] Both the upper and lower units are cylindrical, with the diameter of the upper unit being larger than that of the lower unit; the middle unit is frustum-shaped and connects the upper and lower units; the bottom unit is semi-cylindrical and is fixed to the bottom of the lower unit.

[0006] The surface of the airbag layer is provided with an alignment hole, and the surface of the metal base box is provided with an air outlet hole. When the airbag layer is installed on the metal base box, the alignment hole and the air outlet hole are connected in corresponding positions. The interior of the metal base box is provided with an impact pump assembly, which can drive airflow through the air outlet hole under impact force.

[0007] The impact pump air assembly includes modular air boxes and inertial core cylinders. Four sets of modular air boxes are arranged circumferentially on the inner wall of a metal base box, distributed in four directions. Each modular air box is connected to an air outlet at its corresponding position. The inertial core cylinder is located inside the metal base box, with positioning springs connected to both ends. These springs allow the inertial core cylinder to move elastically and centrally within the metal base box. A corrugated airbag connects the inertial core cylinder and the modular air boxes. A first one-way valve is embedded in the modular air box, and a second one-way valve is embedded in the inertial core cylinder. The first one-way valve allows gas in the corrugated airbag to flow unidirectionally into the modular air box, and the second one-way valve allows gas in the inertial core cylinder to flow unidirectionally into the corrugated airbag. An air intake hole is perforated through the surface of the inertial core cylinder.

[0008] The interior of the modular gas box is equipped with a horizontal baffle. When the horizontal baffle moves up, it can block and seal the gas outlet. The horizontal baffles are connected and fixed to each other by vertical connecting plates. The inner wall of the metal base box is provided with an annular interconnection chamber. The annular interconnection chamber is an annular cavity that is connected to the bottom of the modular gas box. The four modular gas boxes are interconnected through the annular interconnection chamber. A drive shaft is fixedly installed on the horizontal baffle. The drive shaft passes through the annular interconnection chamber in a sealed manner and extends to the outside of the annular interconnection chamber.

[0009] A magnetic arc plate is fixedly installed at the end of the drive shaft. A reset spring is installed between the magnetic arc plate and the lower surface of the annular interconnection chamber. An electromagnet module is installed above the magnetic arc plate. When the electromagnet module is energized, it can generate magnetic force, attracting the magnetic arc plate to move up, which in turn drives the transverse baffle plate to move up, thus sealing the air outlet.

[0010] The surface of the airbag layer is provided with hemispherical airbags and longitudinal and transverse interconnecting pipes. The hemispherical airbags are evenly distributed in a matrix and are interconnected with each other through the longitudinal and transverse interconnecting pipes. The electronic acquisition box is connected to the hemispherical airbags on the airbag layer through an air tube. The surface of the rigid force equalizing plate is provided with positioning pressure holes. The diameter of the positioning pressure holes is smaller than the diameter of the hemispherical airbags. The rigid force equalizing plate is positioned and pressed onto the hemispherical airbags through the positioning pressure holes.

[0011] An intelligent assessment system for combat training utilizes a force-sensing electronic sandbag. This integrated hardware and software system, deployed on a local server, communicates with the force-sensing electronic sandbag to exchange data. It includes a data processing module, a data storage module, and a visualization data dashboard module. The data processing module receives raw data uploaded from the force-sensing electronic sandbag and establishes a pressure-force calibration model, converting the pressure change ΔP into a standard striking force value F. It also identifies the striking point by matching the corresponding striking area with a number. The data storage module establishes a personalized training file for each trainee, enabling full lifecycle storage and traceability of training data. The visualization data dashboard module features a graphical, visual interface design and supports simultaneous display across multiple terminals.

[0012] The visualized data dashboard module displays real-time data and statistical data.

[0013] The data storage module stores basic student information, raw data collected from each training session, and specialized scoring reports; it supports multi-dimensional retrieval by student ID, training time, assessment item, and striking action.

[0014] Compared with the prior art, the beneficial effects of the present invention are: The force-sensing electronic sandbag of this invention adopts a modular armored design, with detachable armored force-sensing modules installed in the upper, middle, lower and bottom parts of the electronic sandbag. Local damage does not require replacement of the whole bag, enabling maintenance on demand and reducing maintenance costs.

[0015] The armored force sensing module of this invention adopts a four-layer structure consisting of a buffer layer, a rigid force equalizing plate, an airbag layer, and a metal base box. The buffer layer enables rapid recovery after impact, meeting the needs of continuous impact training. The rigid force equalizing plate evenly transmits the impact force from multiple angles to the airbag, ensuring that a single module can accurately collect the air pressure changes generated by impacts from multiple angles, thus solving the problems of uneven force distribution and low accuracy of multi-angle acquisition in existing equipment.

[0016] The force-sensing electronic sandbag of this invention adopts an irregular design with a large-diameter cylinder at the top, a frustum-shaped cylinder in the middle, a small-diameter cylinder at the bottom, and a semi-cylinder at the bottom. It fits the striking feel of various movements such as straight punches, hook punches, uppercuts, leg techniques, elbow and knee techniques. Furthermore, the armored force-sensing modules in the upper, middle, and lower parts are evenly distributed along the circumference to adapt to multi-angle striking trajectories.

[0017] The force-sensing electronic sandbag of this invention utilizes the impact force to dissipate heat from the hemispherical airbag. Under extreme and continuous impact conditions, when mechanical energy is continuously converted into the internal energy of the gas inside the hemispherical airbag, the gas temperature inside the hemispherical airbag can be kept stable, reducing gas temperature changes and improving the accuracy of force detection.

[0018] The force-sensing electronic sandbag of this invention, through the combination of a horizontal baffle, annular interconnected chamber, and electromagnet module, can close the air vents on other sides when a single-sided armored force-sensing module is continuously struck, concentrating the heat dissipation gas into the air vent corresponding to the armored force-sensing module being struck, maintaining the gas temperature in its hemispherical airbag, achieving targeted heat dissipation enhancement, and ensuring the accuracy of force detection.

[0019] This invention, an intelligent assessment system for combat training, establishes an air pressure-force calibration model to accurately identify striking force and striking location. It also creates a personalized training file for each trainee, enabling full lifecycle storage and multi-dimensional retrieval of training data. This provides comprehensive data support for the quantitative analysis of training effectiveness and meets the all-round needs of professional training. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 This is a partial exploded view of the structure of the present invention.

[0022] Figure 3 This is a schematic diagram of the airbag layer of the present invention.

[0023] Figure 4 This is a three-dimensional half-sectional view of the metal base box of the present invention.

[0024] Figure 5 This is a three-dimensional half-section lower view of the metal base box of the present invention.

[0025] Figure 6 This is a three-dimensional half-section diagram of the corrugated airbag at a horizontal angle.

[0026] Figure 7 This is a three-dimensional half-section diagram of the horizontal angle at the circular interconnection warehouse.

[0027] Figure 8 This is a schematic diagram of the structure at the horizontal shield.

[0028] In the diagram: 1. Upper unit; 2. Middle unit; 3. Lower unit; 4. Bottom unit; 5. Metal base box; 6. Buffer layer; 7. Rigid force equalizing plate; 8. Airbag layer; 801. Alignment hole; 501. Air outlet; 502. Module air box; 503. Inertia core cylinder; 504. Positioning spring; 505. Corrugated airbag; 506. First one-way valve; 507. Second one-way valve; 508. Air intake hole; 509. Horizontal baffle; 510. Vertical connecting plate; 511. Annular interconnection compartment; 512. Drive shaft; 513. Magnetic arc plate; 514. Reset compression spring; 515. Electromagnet module; 701. Positioning pressure hole; 802. Hemispherical airbag; 803. Longitudinal and transverse interconnection pipe; 401. Bottom arch frame. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Please see Figures 1 to 8 This invention provides a technical solution: a force-sensing electronic sandbag, such as... Figure 1 As shown, from top to bottom, it includes four parts: upper unit 1, middle unit 2, lower unit 3, and bottom unit 4. All four parts are equipped with armored force sensing modules. The upper unit 1 and lower unit 3 are both cylindrical, with the diameter of the upper unit 1 being larger than that of the lower unit 3. The middle unit 2 is frustum-shaped and connects the upper unit 1 and the lower unit 3. The bottom unit 4 is semi-cylindrical and is fixed to the bottom of the lower unit 3.

[0031] like Figure 1 As shown, a bottom arch 401 is fixedly installed on the bottom unit 4. The bottom arch 401 is U-shaped and inverted, supporting and lifting the bottom unit 4 so that it can be used for kicking and striking. When the force-sensing electronic sandbag of this invention is installed, it is fixed to the spring base by the bottom arch 401, allowing the sandbag to tilt elastically.

[0032] The armored force sensing module comprises, from the outside in, a buffer layer 6, a rigid force-equalizing plate 7, an airbag layer 8, and a metal base box 5. The buffer layer 6 is made of high-resilience PU foam, possessing excellent elasticity, tear resistance, wear resistance, water resistance, and rapid rebound characteristics. It exhibits no permanent deformation after impact and can quickly return to its initial state, meeting the needs of continuous striking training. The buffer layer 6 is shaped to fit the module's form and is externally wrapped in sandbag leather, directly absorbing impacts from multiple movements and angles, including punches, kicks, elbows, and knees, effectively cushioning the striking force.

[0033] The rigid force equalizing plate 7 is made of rigid high-strength engineering plastic plate or lightweight metal plate, which has good structural rigidity and force transmission. It is non-deformable and does not absorb energy, so it can achieve uniform diffusion and transmission of striking force. The rigid force equalizing plate 7 is used to uniformly transmit the striking force of different actions and angles such as punches, legs, elbows, and knees to the airbag layer 8 inside the module, so that the airbag layer 8 is evenly loaded, avoiding the air pressure acquisition deviation caused by local single point force. It ensures that the airbag layer 8 of a single module can accurately and uniformly collect air pressure changes from multi-angle strikes, and greatly improve the stability and consistency of force acquisition.

[0034] The airbag layer 8 is made of a highly elastic, fatigue-resistant, and airtight rubber membrane, which can withstand high-frequency and high-intensity impact deformation without damage or air leakage, making it suitable for long-term training needs in combat.

[0035] The metal base box 5 is made of stainless steel plate through bending and welding, possessing excellent structural strength and impact resistance, providing stable structural support for the module. An electronic acquisition box is installed inside the metal base box 5, connected to the airbag layer 8 via an air tube. The electronic acquisition box collects real-time changes in the instantaneous air pressure inside the airbag layer 8. When the buffer layer 6 is struck, pressure is applied to the airbag layer 8 via a rigid force-equalizing plate 7. The impact force is determined based on the instantaneous air pressure change inside the airbag layer 8. The electronic acquisition box includes a pressure sensing unit, a main control unit, a communication module, and a power module. The pressure sensing unit is connected to the airbag layer 8 via an air tube, collecting real-time changes in the instantaneous air pressure inside the airbag layer 8 and converting the analog air pressure signal into a digital electrical signal. It possesses high precision and fast response characteristics, capable of capturing minute air pressure fluctuations generated by a punch and eliminating interference from external environmental air pressure.

[0036] The main control unit is the core control unit of the module, electrically connected to the pressure sensing unit, and receives digital electrical signals transmitted by the sensor. The communication module is electrically connected to the main control unit and serves as the module's external communication port. The power supply module provides a stable DC power supply for the entire electronic data acquisition box.

[0037] An alignment hole 801 is provided through the surface of the airbag layer 8, and an air outlet 501 is provided through the surface of the metal base box 5. When the airbag layer 8 is installed on the metal base box 5, the alignment hole 801 and the air outlet 501 are connected in corresponding positions. An impact pump assembly is provided inside the metal base box 5. The impact pump assembly can drive the airflow through the air outlet 501 to be ejected under the impact force.

[0038] The impact pump assembly includes a modular air box 502 and an inertial core cylinder 503. The modular air box 502 is disposed on the inner wall of the metal base box 5, and there are four sets of them, which are circumferentially distributed in four directions. The modular air box 502 is connected to the air outlet 501 at its corresponding position. The inertial core cylinder 503 is disposed inside the metal base box 5, and positioning springs 504 are respectively connected to both ends of the inertial core cylinder 503. The positioning springs 504 make the inertial core cylinder 503 have an elastic and central movement tendency inside the metal base box 5.

[0039] A corrugated airbag 505 is provided between the inertial core cylinder 503 and the modular air box 502. The corrugated airbag 505 is as follows: Figure 4 As shown, it is a corrugated short tube that can be axially compressed or stretched. In order to prevent the corrugated airbag 505 from collapsing under negative pressure, a metal ring is embedded in the side wall of the corrugated airbag 505 to provide radial support for the corrugated airbag 505 without affecting the axial movement of the corrugated airbag 505.

[0040] A first one-way valve 506 is embedded in the modular air box 502, and a second one-way valve 507 is embedded in the inertial core cylinder 503. The first one-way valve 506 allows the gas in the corrugated air bag 505 to flow unidirectionally into the modular air box 502, and the second one-way valve 507 allows the gas in the inertial core cylinder 503 to flow unidirectionally into the corrugated air bag 505. An air intake hole 508 is provided through the surface of the inertial core cylinder 503.

[0041] The module air box 502 has a transverse baffle 509 inside. When the transverse baffle 509 moves upward, it can block and seal the air outlet 501. Figure 8 As shown, the horizontal baffle 509 is an arc-shaped plate that is elastically clipped into the interior of the modular air box 502 and elastically contacts the inner wall of the modular air box 502 to block the air outlet 501. The horizontal baffles 509 are connected and fixed to each other by vertical connecting plates 510. The inner wall of the metal base box 5 is provided with an annular interconnection chamber 511. The annular interconnection chamber 511 is an annular cavity that is connected to the bottom of the modular air box 502. The four modular air boxes 502 are interconnected through the annular interconnection chamber 511. A drive shaft 512 is fixedly installed on the horizontal baffle 509. The drive shaft 512 passes through the annular interconnection chamber 511 in a sealed manner and extends to the outside of the annular interconnection chamber 511.

[0042] A magnetic arc plate 513 is fixedly installed at the end of the drive shaft 512. A reset spring 514 is installed between the magnetic arc plate 513 and the lower surface of the annular interconnection chamber 511. An electromagnet module 515 is installed above the magnetic arc plate 513. When the electromagnet module 515 is energized, it can generate magnetic force to attract the magnetic arc plate 513 to move upward, thereby driving the transverse baffle 509 to move upward and closing the air outlet 501.

[0043] The surface of the airbag layer 8 is provided with hemispherical airbags 802 and longitudinal and transverse interconnecting pipes 803. The hemispherical airbags 802 are evenly distributed in a matrix and are interconnected with each other through the longitudinal and transverse interconnecting pipes 803. The electronic acquisition box is connected to the hemispherical airbags 802 on the airbag layer 8 through an air tube. The surface of the rigid force equalizing plate 7 is provided with positioning pressure holes 701. The diameter of the positioning pressure holes 701 is smaller than the diameter of the hemispherical airbags 802. The rigid force equalizing plate 7 is positioned and pressed on the hemispherical airbags 802 through the positioning pressure holes 701.

[0044] An intelligent assessment system for combat training uses a force-sensing electronic sandbag. The system is an integrated hardware and software system deployed on a local server. It communicates with the force-sensing electronic sandbag to achieve data interaction, including a data processing module, a data storage module, and a visualization data dashboard module. The data processing module receives raw data uploaded by the force-sensing electronic sandbag and establishes a pressure-force calibration model. It converts the pressure change ΔP into a standard impact force value F and identifies the impact location by matching the corresponding impact area with its assigned number. The pressure-force calibration model is specifically: F = K(m) × ΔP + B(m), where F is the standard impact force value in N; ΔP is the pressure change of the airbag layer 8 in Pa; and K(m) and B(m) are specific calibration coefficients, where m represents the armored force-sensing modules at the top / middle / bottom / top of the electronic sandbag, distinguished by their assigned numbers. These coefficients are calibrated using a standard hammer through multiple sets of impact experiments with different angles, forces, and actions. Each module is calibrated independently to eliminate the impact of location and structural differences on data acquisition accuracy.

[0045] The data storage module is used to establish a unique training file for each student, enabling full lifecycle storage and traceability of training data. The storage content of the data storage module includes basic student information, original data collected from each training session, and specialized scoring reports. It supports multi-dimensional retrieval by student ID, training time, assessment item, and striking action.

[0046] The visual data dashboard module adopts a graphical and visual interface design, supporting simultaneous display on multiple terminals. The module displays real-time and statistical data. Real-time data includes, for example, dynamic indicators of striking force and precise positioning of striking modules / areas, while also showing auxiliary data such as combo speed, effective strike count, and training duration. Statistical data includes, for example, pie charts showing the striking frequency of each action, force variation curves for each module / area, and bar charts showing the pass rate of force for each action.

[0047] When the force-sensing electronic sandbag of this invention is in use, such as... Figure 2 As shown, when a user strikes the surface of the buffer layer 6, the impact force is evenly transmitted to the airbag layer 8 through the rigid force equalizing plate 7, causing the air pressure of the airbag layer 8 to change. The greater the impact force, the higher the air pressure of the airbag layer 8 is instantly, thus realizing force detection.

[0048] When the hemispherical airbag 802 on the airbag layer 8 is impacted, mechanical energy is converted into internal energy. As the hemispherical airbag 802 continues to be impacted, the internal energy of the gas accumulates, and the temperature gradually rises. This causes the gas to expand at a high temperature, changing the initial pressure and affecting the electronic acquisition box's collection and judgment of air pressure. However, this invention, through its structural design, utilizes the impact force received by the electronic sandbag to dissipate heat from the hemispherical airbag 802 and the gas within it, reducing temperature changes, improving detection accuracy, and simultaneously reducing energy consumption.

[0049] like Figure 4As shown, when the force-sensing electronic sandbag is hit, the metal base box 5 will move rapidly under the impact force, and the inertial core cylinder 503 will move relative to the metal base box 5 due to inertia. Under the elastic action of the positioning spring 504, the inertial core cylinder 503 can squeeze the corrugated airbag 505 multiple times.

[0050] When the corrugated airbag 505 is compressed, the gas inside is injected into the module air box 502 through the first one-way valve 506, blown out through the air outlet 501, and finally cooled down the hemispherical airbag 802 and the gas inside through the alignment hole 801. When the corrugated airbag 505 is stretched, a negative pressure is created inside the corrugated airbag 505, and the gas in the inertial core cylinder 503 is drawn into the corrugated airbag 505 through the second one-way valve 507 for replenishment and circulation, thus realizing the pumped air delivery.

[0051] like Figure 2 As shown, the upper unit 1, middle unit 2, and lower unit 3 have the same structure, all consisting of armored force sensing modules arranged in a circular array. In the accompanying drawings, four groups are shown. Four buffer layers 6 in the front, back, left, and right directions withstand impacts. Under extreme conditions, such as during high-frequency punching training, only one side of the buffer layer 6 is continuously impacted. The corresponding airbag layer 8 is frequently subjected to mechanical energy, making it more prone to heating.

[0052] This invention uses an electronic acquisition box to detect air pressure changes in the airbag layer 8. When the above-mentioned working condition is detected, the electromagnet modules 515 corresponding to the other three buffer layers 6 are energized. Figure 5 As shown, the electromagnet module 515 generates a magnetic force, attracting the magnetic arc plate 513 to overcome the magnetic force of the reset spring 514 and move upward, causing the transverse baffle 509 to move upward and close the vent 501. This closes the vent 501 corresponding to the other three buffer layers 6.

[0053] The gas input into the module air box 502 by the corrugated airbag 505 through the first one-way valve 506 will be centrally transported to the module air box 502 corresponding to the continuously impacted buffer layer 6 through the annular interconnection chamber 511, and output through the air outlet 501. This enhances the cooling of the airbag layer 8 corresponding to the continuously impacted buffer layer 6, maintains the stable gas temperature in its hemispherical airbag 802, achieves targeted heat dissipation enhancement, and ensures the accuracy of force detection.

[0054] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A force-sensing electronic sandbag, comprising four parts from top to bottom: an upper unit, a middle unit, a lower unit, and a bottom unit, each part being equipped with an armored force-sensing module, characterized in that: The armored force sensing module includes, from the outside to the inside, a buffer layer, a rigid force equalizing plate, an airbag layer, and a metal base box. An electronic acquisition box is installed inside the metal base box. The electronic acquisition box is connected to the airbag layer through an air tube. The electronic acquisition box collects the instantaneous air pressure change value inside the airbag layer in real time. When the buffer layer is hit, pressure is applied to the airbag layer through a rigid force equalizing plate. The impact force is determined based on the instantaneous air pressure change value inside the airbag layer.

2. The force-sensing electronic sandbag according to claim 1, characterized in that: Both the upper and lower units are cylindrical, with the diameter of the upper unit being larger than that of the lower unit. The middle unit is shaped like a frustum and is connected between the upper unit and the lower unit; the bottom unit is shaped like a semi-cylinder and is fixed to the bottom of the lower unit.

3. The force-sensing electronic sandbag according to claim 1, characterized in that: The surface of the airbag layer is provided with an alignment hole, and the surface of the metal base box is provided with an air outlet hole. When the airbag layer is installed on the metal base box, the alignment hole and the air outlet hole are connected in corresponding positions. The metal base box is equipped with an impact pump assembly, which can drive airflow through the air outlet under impact force.

4. The force-sensing electronic sandbag according to claim 3, characterized in that: The impact pump air assembly includes modular air boxes and inertial core cylinders. The modular air boxes are set on the inner wall of the metal base box, and there are four sets in total, which are circumferentially distributed in four directions. The modular air boxes are connected to the air outlets at their corresponding positions. The inertial core cylinder is set inside the metal base box, and positioning springs are respectively connected to both ends of the inertial core cylinder. The positioning springs make the inertial core cylinder have an elastic and central movement tendency inside the metal base box. A corrugated airbag is connected between the inertial core and the modular air box. A first one-way valve is embedded in the modular air box, and a second one-way valve is embedded in the inertial core. The first one-way valve allows the gas in the corrugated airbag to flow unidirectionally into the modular air box, and the second one-way valve allows the gas in the inertial core to flow unidirectionally into the corrugated airbag. An air intake hole is provided through the surface of the inertial core.

5. The force-sensing electronic sandbag according to claim 4, characterized in that: The module air box is equipped with a horizontal baffle. When the horizontal baffle moves up, it can block and seal the air outlet. The horizontal baffles are connected and fixed to each other by a vertical connecting plate. An annular interconnection chamber is provided on the inner wall of the metal base box. The annular interconnection chamber is an annular cavity and is connected to the bottom of the modular gas box. The four modular gas boxes are interconnected through the annular interconnection chamber. A drive shaft is fixedly provided on the horizontal cover plate. The drive shaft passes through the annular interconnection chamber in a sealed manner and extends to the outside of the annular interconnection chamber.

6. The force-sensing electronic sandbag according to claim 5, characterized in that: A magnetic arc plate is fixedly installed at the end of the drive shaft. A reset spring is installed between the magnetic arc plate and the lower surface of the annular interconnection chamber. An electromagnet module is installed above the magnetic arc plate. When the electromagnet module is energized, it can generate magnetic force, attracting the magnetic arc plate to move up, which in turn drives the transverse baffle plate to move up, thus sealing the air outlet.

7. The force-sensing electronic sandbag according to claim 1, characterized in that: The surface of the airbag layer is provided with hemispherical airbags and longitudinal and transverse interconnecting tubes. The hemispherical airbags are evenly distributed in a matrix and are interconnected with each other through the longitudinal and transverse interconnecting tubes. The electronic acquisition box is connected to the hemispherical airbags on the airbag layer through air tubes. The rigid force equalizing plate has positioning pressure holes on its surface. The diameter of the positioning pressure holes is smaller than the diameter of the hemispherical airbag. The rigid force equalizing plate is positioned and pressed onto the hemispherical airbag through the positioning pressure holes.

8. An intelligent assessment system for combat training, employing the force-sensing electronic sandbag as described in any one of claims 1-7, characterized in that: It is an integrated hardware and software system deployed on a local server, which communicates with the force-sensing electronic sandbag to achieve data interaction, including a data processing module, a data storage module and a visualization data dashboard module. The data processing module is used to receive raw data uploaded by the force-sensing electronic sandbag, establish an air pressure-force calibration model, convert the air pressure change ΔP into a standard striking force value F, and identify the striking location by matching the corresponding striking area with the number. The data storage module is used to establish a unique training file for each student, enabling full lifecycle storage and traceability of training data. The visualized data dashboard module adopts a graphical and visual interface design and supports simultaneous display on multiple terminals.

9. The intelligent assessment system for combat training according to claim 1, characterized in that: The visualized data dashboard module displays real-time data and statistical data.

10. The intelligent assessment system for combat training according to claim 1, characterized in that: The data storage module stores basic student information, raw data collected from each training session, and specialized scoring reports; it supports multi-dimensional retrieval by student ID, training time, assessment item, and striking action.

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