V force swimming land training device with water grabbing and pushing functions

Abstract

This invention belongs to the field of swimming land-based training equipment, specifically a V-force swimming land-based training equipment with water-catching and water-pushing functions. It includes: a bottom frame for support, on which a support component for the athlete to lie prone is mounted; a mounting shell, fixedly mounted on the top of the bottom frame, containing a motor connected to a left and right drum; photoelectric devices mounted on the motor's output shaft, the left drum, and the right drum; the photoelectric devices include a code disk and a slotted optocoupler; two pull ropes, respectively mounted on the left and right drums, each with a fixed mounting rod at one end, and a handle fixedly mounted at one end of each rod; and a pulley assembly, mounted on the top of the bottom frame, for guiding the two pull ropes. This invention solves the problem of "unresponsive start-up and loss of responsiveness during deceleration" in traditional isokinetic training equipment, accurately simulating the instantaneous support sensation of catching water and the continuous resistance sensation of pushing water.

Description

Technical Field

[0001] This invention relates to the field of swimming land training equipment technology, and in particular to a V-force swimming land training equipment with water-catching and water-pushing functions. Background Technology

[0002] Swimming is a sport that demands a high level of technical skill and water feel, and its propulsion efficiency directly determines athletic performance. According to fluid mechanics principles, swimming propulsion is mainly divided into two categories: drag propulsion and lift propulsion. Drag propulsion, based on Newton's third law, generates a reaction force in the water through the backward stroke of the limbs. Lift propulsion, on the other hand, is generated by the three-dimensional curvilinear motion of the limbs, utilizing Bernoulli's principle to create a pressure difference and thus achieve propulsion. In actual swimming technique, whether it's freestyle, butterfly, or breaststroke, the underwater arm stroke is typically broken down into several stages: entry, catch, pull, push, and arm lift or recovery. Among these, the "catch" and "pull" are the key steps in generating core propulsion. The catch refers to the action of extending the hand forward after entering the water, "anchoring" the water with a high elbow position to create effective support. Its purpose is to activate large muscle groups such as the latissimus dorsi to participate in the subsequent power generation. The push, based on the catch and pull, accelerates the backward push of the water to generate forward propulsion.

[0003] To enhance swimming-specific strength without entering the water, land-based training equipment has emerged. Currently, there are many types of land-based swimming training equipment on the market, mainly including pulley resistance bands, rubber resistance bands, and isokinetic training equipment. Existing academic research has conducted surface electromyography (EMG) analysis on these three common land-based resistance methods. The results show that different resistance methods have significant differences in the timing and effect of stimulation on key upper limb muscle groups such as the brachioradialis, biceps brachii, pectoralis major, triceps brachii, and latissimus dorsi. For example, isokinetic resistance is more effective in the catch and push phases, while pulley resistance is more effective in the arm recovery phase. This indicates that the design of land-based training equipment directly affects the effectiveness of strength training in converting into water-specific skills.

[0004] In existing technologies, isokinetic trainers are widely used due to their unique resistance characteristics. The characteristic of isokinetic trainers is that they subject muscles to maximum load throughout the entire range of motion of the joint; specifically, the faster the trainee pulls the rope, the greater the resistance provided by the device; the slower the speed, the less resistance. This resistance pattern can well simulate the basic physical properties of water, namely that water resistance is proportional to the square of the object's velocity. Therefore, isokinetic trainers are often considered the land-based training method that most closely resembles the resistance environment in water.

[0005] However, although isokinetic trainers share similarities with water resistance in terms of the mechanical properties of resistance changing with speed, they still have fundamental shortcomings in simulating the actual force exertion felt by athletes. This is mainly reflected in their inability to simulate the crucial "catch" and "push" phases of swimming technique. In real water, the catch is not simply a rapid pull, but requires the athlete to quickly sense the water's support point the instant their palm contacts the surface, creating a "sense of anchoring" and effectively transferring weight to the arm. This force exertion has a distinct instantaneous initiation characteristic; the hand needs to feel resistance even when the relative speed is not high to complete the "catch." Similarly, the push phase requires the athlete to continuously feel the water's reaction force as they pull to maximum speed and begin to decelerate, ensuring the continuity of propulsion.

[0006] However, existing isokinetic trainers rely on speed to generate resistance, providing almost no resistance at the initial initiation phase (when the speed is zero or extremely low). This results in trainees experiencing a feeling of "skipping the water" or "not being able to hold onto it," which is far removed from the experience of gripping the water as soon as the hand enters the water. Furthermore, during the rope return or deceleration phase, the isokinetic resistance rapidly diminishes, failing to simulate the sustained muscle sensation of the push phase. This lack of force feedback creates a "sensory gap" between land-based training and specific water techniques, making it difficult to maximize the conversion of training effects into actual swimming ability. Summary of the Invention

[0007] The purpose of this invention is to address the shortcomings of the prior art by proposing a V-force swimming land-based training device with water-catching and water-pushing functions.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: A V-force swimming land-based training device with water-catching and water-pushing functions, comprising: A bottom frame for support, on which support components are mounted for athletes to lie prone; The mounting housing is fixedly installed on the top of the bottom frame. The motor is installed inside the mounting housing. The motor is connected to the left drum and the right drum. Photoelectric devices are installed on the output shaft of the motor, the left drum, and the right drum. The optoelectronic device includes a code disk and a slotted optocoupler; Two pull ropes are installed on the left and right drums respectively. One end of each pull rope is fixedly connected to a mounting rod, and one end of each mounting rod is fixedly installed with a handle. The pulley assembly, mounted on top of the bottom frame, guides the two pull ropes.

[0009] Preferably, the bottom frame includes two crossbars, which are fixedly mounted between multiple vertical bars, and the bottom of the mounting shell is fixedly connected to the top of the two crossbars.

[0010] Preferably, the support assembly includes two support plates, which are mounted on the top of two corresponding longitudinal bars, and the top of the two support plates is provided with the same load-bearing plate for the athlete to lie on.

[0011] Preferably, the pulley assembly includes two vertical rods, which are respectively fixedly installed on the top of two horizontal rods, and a stabilizing rod is fixedly installed between the two vertical rods.

[0012] Preferably, a fixed housing is fixedly installed on one side of each of the two vertical rods, and a pulley and a limit wheel are rotatably installed inside each of the two fixed housings, with the pull rope cooperating with the corresponding pulley and limit wheel.

[0013] Preferably, a sealing plate is provided on one side of the mounting shell, which is used to seal the opening of the mounting shell.

[0014] Preferably, the top of the mounting shell is provided with two vertical holes, and one end of each of the two pull ropes passes through the two vertical holes.

[0015] Preferably, a control screen is provided on the outer side of the mounting housing.

[0016] Preferably, the outer side of the support plate is covered with a soft pad.

[0017] Preferably, both the left and right drums are equipped with one-way bearings.

[0018] The beneficial effects of the V-force swimming land-based training device with water-catching and water-pushing functions described in this invention are as follows: The force sensation simulation is realistic: it solves the problem of "no feeling when starting and loss of feeling when decelerating" in traditional isokinetic trainers, and accurately simulates the instantaneous support feeling when grabbing water and the continuous resistance feeling when pushing water.

[0019] The training is highly targeted: by adjusting the capacitor parameters, the "water grabbing intensity / depth" and "water pushing intensity / depth" can be set independently to provide specific reinforcement for weak points.

[0020] Intelligent interaction and energy saving: It has self-start, self-charging and self-shutdown functions, making it convenient to use and environmentally friendly.

[0021] Precise data monitoring: Through three sets of photoelectric devices, the difference in force exertion between the left and right arms can be accurately distinguished, providing data support for technical movement analysis. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a V-force swimming land-based training device with water-catching and water-pushing functions proposed in this invention. Figure 2 This invention proposes a V-force swimming land-based training device with water-catching and water-pushing functions. Figure 1 A magnified structural diagram of part A in the middle; Figure 3 This is a schematic diagram of the overall structure of a V-force swimming land-based training device with water-catching and water-pushing functions proposed in this invention. Figure 4 This is a schematic diagram of the structure of a V-force swimming land-based training device with water-catching and water-pushing functions proposed in this invention, with the thick enclosed plate removed. Figure 5 This invention proposes a V-force swimming land-based training device with water-catching and water-pushing functions. Figure 4 A schematic diagram of the structure after removing the vertical rod; Figure 6 This invention proposes a V-force swimming land-based training device with water-catching and water-pushing functions. Figure 5 A magnified structural diagram of part B in the middle section; Figure 7 This is a schematic diagram of the slotted optical coupler of a V-force swimming land-based training device with water-catching and water-pushing functions proposed in this invention. Figure 8 This is a schematic diagram of the encoder of a V-force swimming land-based training device with water-catching and water-pushing functions proposed in this invention. Figure 9 This is a schematic diagram of the handle structure of a V-force swimming land-based training device with water-catching and water-pushing functions proposed in this invention. Figure 10 This is a schematic diagram of a second embodiment of the V-force swimming land training device with water-catching and water-pushing functions proposed in this invention; Figure 11 This invention proposes a V-force swimming land-based training device with water-catching and water-pushing functions. Figure 10 A magnified structural diagram of section C; Figure 12 This invention proposes a V-force swimming land-based training device with water-catching and water-pushing functions. Figure 10 A schematic diagram of the structure from one perspective after removing the supporting plate; Figure 13 This invention proposes a V-force swimming land-based training device with water-catching and water-pushing functions. Figure 12 A magnified structural diagram of section E in the middle; Figure 14 This invention proposes a V-force swimming land-based training device with water-catching and water-pushing functions. Figure 10 A schematic diagram of the structure from another perspective after removing the supporting plate; Figure 15This invention proposes a V-force swimming land-based training device with water-catching and water-pushing functions. Figure 14 A magnified structural diagram of section D in the middle; Figure 16 This is a circuit diagram illustrating the water-catching and water-pushing functions of a V-force swimming land-based training device proposed in this invention. Figure 17 This invention provides a self-starting and self-shutting circuit for a V-force swimming land-based training device with water-catching and water-pushing functions; Figure 18 This invention presents a microcontroller control circuit diagram for a V-force swimming land-based training device with water-catching and water-pushing functions. Figure 19 The isokinetic training Vt and Ft curves of a V-force swimming land-based training device with water-catching and water-pushing functions proposed in this invention are shown below. Figure 20 The diagram shows the Vt and Ft curves of a V-force swimming land-based training device with water-catching and water-pushing functions proposed in this invention. Figure 21 The present invention provides a V-force swimming land-based training device with water-catching and water-pushing functions, and its water-catching training Vt and Ft curves. Figure 22 The diagram shows the Vt and Ft curves for the water pushing training of a V-force swimming land-based training device with water catching and pushing functions proposed in this invention.

[0023] 1. Horizontal bar; 2. Vertical bar; 3. Support plate; 4. Bearing plate; 5. Mounting shell; 6. Control panel; 7. Vertical bar; 8. Stabilizing bar; 9. Fixed shell; 10. Limiting wheel; 11. Pulley; 12. Pull rope; 13. Mounting rod; 14. Handle; 15. Vertical hole; 16. Enclosure plate; 17. Motor; 18. Left drum; 19. Encoder; 20. Slotted optocoupler; 21. T-shaped insertion hole; 22. T-shaped plate; 23. Fixed base; 24. Reset slot; 25. Positioning plate; 26. Vertical plate; 27. Positioning hole; 28. Slot; 29. ​​Insertion block; 30. Connecting horizontal hole; 31. Rectangular vertical hole; 32. Rectangular sliding plate; 33. Locking plate; 34. Second spring; 35. Rotating shaft; 36. Elliptical plate; 37. Rotating block; 38. Pull rod; 39. Horizontal plate; 40. Limiting slot; 41. Limiting block. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0025] Example 1 Reference Figures 1-9 , Figure 19 , Figure 20 , Figure 21 , Figure 22 A V-force swimming land-based training device with water-catching and water-pushing functions, comprising: A bottom frame for support, on which support components are mounted for athletes to lie prone; Mounting housing 5 is fixedly installed on the top of the bottom frame. Motor 17 is installed inside mounting housing 5. Motor 17 is connected to a left drum 18 and a right drum. Photoelectric devices are installed on the output shaft of motor 17, and on the left and right drums. One set of photoelectric devices (one encoder and one slotted optocoupler) is mounted on the motor shaft, one set on the left drum, and one set on the right drum. The left and right drums have built-in one-way bearings. Pulling the trainer motor rotates it, meaning the slotted optocoupler in the middle outputs a signal. When the rope retracts, the motor does not rotate, so the optocoupler in the middle does not output a signal. Therefore, the presence or absence of a signal from the optocoupler in the middle indicates whether it is pulling or retracting. The left and right drums are each equipped with an encoder and a slotted optocoupler. Whether pulling or retracting, the optocouplers output a signal. When both arms pull the trainer simultaneously, all three optocouplers output signals, and the signals are consistent. The consistency of the three optocoupler signals indicates that both arms are pulling. Pulling the left or right arm requires the left and middle optical coupler signals to match, or the right and middle optical coupler signals to match. The match between the middle optical coupler signal and the left or right optical coupler signal determines whether the left or right arm is being pulled. This allows us to distinguish between two-arm and one-arm training, revealing the differences between the left and right arms during single-arm training. The algorithm can accurately determine the specific positions of the left and right hands.

[0026] The optoelectronic device includes a code disk 19 and a slotted optocoupler 20; Two pull ropes 12 are respectively installed on the left drum 18 and the right drum. One end of each pull rope 12 is fixedly connected to a mounting rod 13, and one end of each mounting rod 13 is fixedly installed with a handle 14. The pulley assembly, mounted on top of the bottom frame, guides the two pull ropes 12.

[0027] In this embodiment, the bottom frame includes two horizontal bars 1, which are fixedly installed between multiple vertical bars 2. The bottom of the mounting shell 5 is fixedly connected to the top of the two horizontal bars 1.

[0028] In this embodiment, the support assembly includes two support plates 3, which are installed on the top of two corresponding longitudinal bars 2. The top of the two support plates 3 is provided with the same bearing plate 4 for athletes to lie on.

[0029] In this embodiment, the pulley assembly includes two vertical rods 7, which are respectively fixedly installed on the top of two horizontal rods 1, and a stabilizing rod 8 is fixedly installed between the two vertical rods 7.

[0030] In this embodiment, a fixed housing 9 is fixedly installed on one side of each of the two vertical rods 7. A pulley 11 and a limiting wheel 10 are rotatably installed inside each of the two fixed housings 9. The pull rope 12 cooperates with the corresponding pulley 11 and limiting wheel 10.

[0031] In this embodiment, a sealing plate 16 is provided on one side of the mounting shell 5, which is used to seal the opening of the mounting shell 5.

[0032] In this embodiment, the top of the mounting shell 5 is provided with two vertical holes 15, and one end of each of the two pull ropes 12 passes through the two vertical holes 15 respectively.

[0033] In this embodiment, a control screen 6 is provided on the outer side of the mounting shell 5.

[0034] In this embodiment, the outer side of the support plate 4 is covered with a soft pad.

[0035] In this embodiment, both the left drum 18 and the right drum are equipped with one-way bearings.

[0036] Reference Figure 16 When transistors N1 and N2 are turned on, the base voltage of N2 is 0.7V, and the base voltage of N1 is 1.4V. The generator voltage Ua is the voltage of Zener diode D8 + 1.4V. After selecting the Zener diode, the generator voltage Ua is greater than the Zener diode voltage U8 + 1.4V and then remains basically unchanged. P=UI. When U is constant, P is directly proportional to I. It can be seen that the greater the force applied, the greater the generator power and the greater the resistance; conversely, the less the force applied, the less the generator power and the less the resistance. It is similar to the resistance of water.

[0037] from Figure 16 It can be seen that when the motor output voltage is less than U8+1.4V, the resistance is small because the transistor is not yet conducting. From a swimming perspective, at the beginning of training, the speed is slow and the motor output voltage is very small, so the transistor cannot conduct, resulting in low resistance. In swimming training, this is called the isokinetic training equipment not being able to hold the water.

[0038] Its unique water-catching and catching training, compared to "isokinetic" equipment, can more realistically simulate water resistance, just like when a swimmer's palm touches the water and immediately grasps it. The process simulates the training scenario in water, maximizing training intensity and improving training results.

[0039] Specific implementation: Utilizing the characteristics of a capacitor, the current is relatively large when the capacitor is first charged, and the current decreases rapidly over time. The microcontroller outputs a Control signal to make the relay K1 energize.

[0040] Definition: The strength of water gripping is defined as the strength of water gripping, which is determined by the capacitance of the capacitor and the magnitude of the charging current. The depth of water gripping is defined by the duration of charging.

[0041] Specific implementation: When the rope is first pulled, the microcontroller outputs a Control signal to activate relay K1, connecting relay contacts 1 and 3, and charging the capacitor. At this time, although the speed is very slow and the motor current is small, the capacitor has a charging current. Changing the size of the capacitor can change the size of the charging current and the strength of the water grab. Capacitor C5 continues the current, generating resistance to complete the water grab training. When the preset time (water grab depth) is reached, the relay disconnects, connecting relay contacts 1 and 2, and capacitor C5 discharges through resistor R1, completing the water grab training and preparing for the next water grab training.

[0042] This unique water-pushing training method, compared to "isokinetic" equipment, more realistically simulates water resistance. During use, users experience a deeply immersive training environment in water, maximizing training intensity and effectiveness.

[0043] Definition: The strength of pushing water is defined as the strength of pushing water, and the larger the capacitance, the larger the charging current. The capacitance or the magnitude of the charging current is defined as the strength of pushing water. The depth of pushing water is defined as the duration of charging.

[0044] Specific implementation: Figure 5 The water-pushing training curve shows that during isokinetic training, the speed decreases and the force decreases accordingly. When the speed reaches its maximum value and begins to decrease, the microcontroller outputs a Control signal to activate relay K1, connecting relay contacts 1 and 3. The capacitor charges, and changing the capacitor size alters the charging current and the intensity of the water push. Capacitor C5 continues the current, generating resistance and working with the motor to complete the water-pushing training. When the preset time (water depth) is reached, the relay disconnects, connecting relay contacts 1 and 2. Capacitor C5 discharges through resistor R1, completing the water-pushing training and preparing for the next training session.

[0045] Reference Figure 17 The V-Force swimming land-based training device, which features water-catching and water-pushing functions, also has the following characteristics: 1. Auto-start: The microcontroller is not powered on, so CPower outputs a low voltage of 0. At this time, VCC=0, pin 2 of the LM339 is low, and pins 12 and 13 of the quad 2-input NOR gate U9D remain low. Therefore, pin 11 of the quad 2-input NOR gate U9D (electrically connected to pin 6 of the quad 2-input NOR gate U9B) outputs a high level, and pin 4 of the quad 2-input NOR gate U9B (electrically connected to pin 2 of the quad 2-input NOR gate U9A) outputs a low level. When the trainer is not connected, pin 1 of the quad 2-input NOR gate U9A is low, therefore pin 3 of the quad 2-input NOR gate U9A is high (the external voltage BAT of U9A is always present). As a result, pin 3 of the quad 2-input NOR gate U9B is high, and the transistor Q1 electrically connected to it is not conducting, so VCC=0. The trainer does not work without power.

[0046] When a user uses the trainer, pulling the cord activates the generator. After circuit processing, the voltage level of network number 6 is high, which is applied to pin 1 of the quad 2-input NOR gate U9A. This causes pin 3 of the quad 2-input NOR gate U9A to output a low level, which is then applied to pin 5 of the quad 2-input NOR gate U9B. This results in transistor Q1 conducting, generating a voltage at capacitor C17, which in turn turns on transistor Q2, thus... Figure 9 The rightmost VCC pin supplies power to the electrical interface and generates a 5V voltage. This allows a control device, such as a microcontroller, to receive its 5V output and begin operation, outputting a high level to CPower. At this time, pins 12 and 13 of the quad 2-input NOR gate U9D are high, causing pin 11 of U9D to output a low level to pin 6 of U9B. Pin 5 of U9B is also low, causing pin 4 of U9B to output a high level to pin 2 of U9A. According to the truth table of the quad 2-input NOR gates, regardless of whether pin 1 of U9A is low or high, pin 3 of U9A always outputs a low level. Therefore, regardless of whether the user uses the trainer or it is temporarily disabled, VCC can always supply power to the microcontroller or control device, and the circuit is always operational. This allows the trainer to automatically power on whenever the user pulls the cord. With continued use, the energy storage unit is continuously charged via the circuitry.

[0047] 2. Adaptive: The greater the force, the faster the speed and the greater the resistance; the less the force, the slower the speed and the less the resistance.

[0048] 3. Self-charging: The electricity generated by the generator is used to charge and store the battery through a circuit, thus recycling the energy and making it green and environmentally friendly.

[0049] 4. Self-shutdown: After a period of inactivity, the microcontroller's CPower output is low, pin 2 of the LM339 is low, and pins 12 and 13 of the quad 2-input NOR gate U9D remain low. Therefore, pin 11 of the quad 2-input NOR gate U9D (electrically connected to pin 6 of the quad 2-input NOR gate U9B) outputs a high level, and pin 4 of the quad 2-input NOR gate U9B (electrically connected to pin 2 of the quad 2-input NOR gate U9A) outputs a low level. When training stops, pin 1 of the quad 2-input NOR gate U9A is low, therefore pin 3 of the quad 2-input NOR gate U9A is high (the external voltage BAT of U9A is always present). As a result, pin 3 of the quad 2-input NOR gate U9B is high, and the transistor Q1 electrically connected to it is not conducting, VCC=0. The circuit is shut down. 1. Technical Background Swimming propulsion principle: Swimming propulsion comes from resistance (reaction force) and lift (Bernoulli's principle). The key phases of the underwater arm stroke are catching the water (creating support and engaging large muscle groups) and pushing the water (accelerating propulsion).

[0051] Limitations of existing technology: Although isokinetic trainers can simulate the relationship between water resistance and the square of speed, they cannot provide resistance at the moment of start-up (speed = 0), resulting in a feeling of "not being able to hold onto the water" and drifting through the air.

[0052] During the deceleration / rebound phase, the resistance decreases rapidly, making it impossible to simulate the feeling of sustained force in the later stages of pushing the water.

[0053] There is a "sensory gap," making it difficult to translate the effects of land-based training into actual swimming ability in the water.

[0054] 2. Structural Composition This trainer simulates the sensation of water by combining a mechanical structure with an electronic control system. Frame and support: bottom frame and support components (load-bearing plate 4) for athletes to lie prone.

[0055] Power and Transmission: Mounting housing 5: Motor 17 is installed inside, connecting the left drum 18 and the right drum.

[0056] The drum has a built-in one-way bearing: this allows the motor to operate when pulling and not when retracting the rope, making it easy to distinguish the different stages of the operation.

[0057] Sensing system: Optoelectronic device: Each of the motor shaft, left drum, and right drum is equipped with one set (code disk 19 + slotted optocoupler 20). It is used to accurately determine whether it is single-arm training or double-arm training, and can locate the position of the left and right hands in real time.

[0058] Actuating end: pull rope 12, handle 14, pulley assembly (guide).

[0059] 3. Core Innovative Functions Compared to traditional "equal motion" resistance, the highlight of this invention lies in its ability to simulate "grabbing water" and "pushing water" by controlling the charging and discharging of a capacitor through a circuit. A unique "water-catching" training method (simulating the feeling of support upon entering the water). Principle: Utilizing the characteristic that a capacitor has a large current when it is first charged.

[0060] Implementation: The moment the rope is pulled, the microcontroller controls the relay to engage, charging the capacitor. At this moment, even if the pulling speed is very slow (the motor current is small), the capacitor charging current will generate initial resistance, simulating the "anchoring feeling" of a hand gripping water upon entering it.

[0061] Parameter definitions: Water gripping strength (capacitance / charging current); Water gripping depth (charging duration).

[0062] The unique "pushing water" training (simulating the feeling of continuous force after acceleration). Principle: When the speed reaches its maximum value and begins to decrease (corresponding to the later stage of actual water pushing), capacitor discharge is intervened again.

[0063] Implementation: When the speed begins to decrease, the microcontroller controls the relay to engage, the capacitor charges to continue the current, generating additional resistance, simulating the feeling of water reaction force during the pushing phase, thus preventing the resistance from decreasing rapidly.

[0064] Parameter definitions: Water pushing strength (capacitor capacity / charging current); Water pushing depth (charging duration).

[0065] 4. Circuit and Intelligent Characteristics Resistance adaptive: The greater the force applied, the greater the generator power, and the greater the resistance; and vice versa, similar to the resistance characteristics of water.

[0066] Self-starting: When the user pulls the cord, the generator triggers the circuit, automatically powering on the microcontroller and other control systems without the need for a physical switch.

[0067] Self-charging: The electricity generated by the generator is rectified and then used to charge the battery, which is green and environmentally friendly.

[0068] Self-shutdown: When not in use for a period of time, the microcontroller automatically cuts off the power and enters sleep mode.

[0069] Reference Figure 18 U1 Stm32F103 main control chip The U7 power conversion chip converts the input 5V voltage into 3.3V voltage for use by U1.

[0070] FIN resistance acquisition, BATIN battery voltage acquisition Speed, SpeedL, and SpeedR are the rotational speeds of the motor, the left drum, and the right drum, respectively, acquired through a slotted optocoupler.

[0071] The J7 connects to a Bluetooth module, allowing the trainer to link to smartphones, tablets, and other electronic devices. Users can then control the swimming trainer and collect data using their phones or tablets.

[0072] The U15 storage chip stores data such as the depth of grabbing and holding water (user-defined duration) and the depth of pushing water (user-defined duration). The D6 LED display module can display data such as training time and cumulative work done. The D7 and D8 status indicator lights show the training mode set by the trainer user, whether it is isokinetic training or grabbing / holding water training.

[0073] The S1, S2, and S3 buttons are used to adjust the resistance level and select the training mode.

[0074] CPower is used to control the trainer to automatically shut off. 12. Control is used to control the additional resistance during grabbing, catching, and pushing. The specific implementation is as follows: Mode 1: Isokinetic Mode When the isokinetic mode is selected and the Control output is low, the grabbing, embracing, and pushing water modules will not function. This is a standard isokinetic trainer.

[0075] Mode 2: Grabbing, catching, and pushing water (V-force training mode) When the athlete selects the catch, grab, and push water mode (V-force training mode), the microcontroller detects the start of training via three optocoupler signals (Speed, SpeedL, SpeedR) and outputs a high level (Control 12). The catch, grab, and push water modules then activate, providing auxiliary resistance for the catch. Once the athlete reaches their set catch / grab depth (duration), Control 12 outputs a low level, ending the catch / grab and entering isokinetic training mode. When the speed reaches its maximum and begins to decrease, Control 12 outputs a high level, activating the catch, grab, and push water modules to provide auxiliary resistance for the push. Once the athlete reaches their set push depth (duration), Control 12 outputs a low level, ending the push and entering isokinetic training mode. Simultaneously, the microcontroller acquires force via FIN and calculates cumulative work and explosive power by integrating force and speed over time.

[0076] V-Force Training Mode is a brand-new intelligent training mode that can better simulate water resistance and better meet the specific strength and physical fitness needs of athletes when performing simulated water training on land.

[0077] Example 2 Reference Figures 10-15 The difference from Embodiment 1 is that: a V-force swimming land-based training device with water-catching and water-pushing functions includes: A bottom frame for support, on which support components are mounted for athletes to lie prone; Mounting housing 5 is fixedly installed on the top of the bottom frame. Motor 17 is installed inside mounting housing 5. Motor 17 is connected to a left drum 18 and a right drum. Photoelectric devices are installed on the output shaft of motor 17, and on the left and right drums. One set of photoelectric devices (one encoder and one slotted optocoupler) is mounted on the motor shaft, one set on the left drum, and one set on the right drum. The left and right drums have built-in one-way bearings. Pulling the trainer motor rotates it, meaning the slotted optocoupler in the middle outputs a signal. When the rope retracts, the motor does not rotate, so the optocoupler in the middle does not output a signal. Therefore, the presence or absence of a signal from the optocoupler in the middle indicates whether it is pulling or retracting. The left and right drums are each equipped with an encoder and a slotted optocoupler. Whether pulling or retracting, the optocouplers output a signal. When both arms pull the trainer simultaneously, all three optocouplers output signals, and the signals are consistent. The consistency of the three optocoupler signals indicates that both arms are pulling. Pulling the left or right arm requires the left and middle optical coupler signals to match, or the right and middle optical coupler signals to match. The match between the middle optical coupler signal and the left or right optical coupler signal determines whether the left or right arm is being pulled. This allows us to distinguish between two-arm and one-arm training, revealing the differences between the left and right arms during single-arm training. The algorithm can accurately determine the specific positions of the left and right hands.

[0078] The optoelectronic device includes a code disk 19 and a slotted optocoupler 20; Two pull ropes 12 are respectively installed on the left drum 18 and the right drum. One end of each pull rope 12 is fixedly connected to a mounting rod 13, and one end of each mounting rod 13 is fixedly installed with a handle 14. The pulley assembly, mounted on top of the bottom frame, guides the two pull ropes 12.

[0079] In this embodiment, the bottom frame includes two horizontal bars 1, which are fixedly installed between multiple vertical bars 2. The bottom of the mounting shell 5 is fixedly connected to the top of the two horizontal bars 1.

[0080] In this embodiment, the support assembly includes two support plates 3, which are installed on the top of two corresponding longitudinal bars 2. The top of the two support plates 3 is provided with the same bearing plate 4 for athletes to lie on.

[0081] In this embodiment, the pulley assembly includes two vertical rods 7, which are respectively fixedly installed on the top of two horizontal rods 1, and a stabilizing rod 8 is fixedly installed between the two vertical rods 7.

[0082] In this embodiment, a fixed housing 9 is fixedly installed on one side of each of the two vertical rods 7. A pulley 11 and a limiting wheel 10 are rotatably installed inside each of the two fixed housings 9. The pull rope 12 cooperates with the corresponding pulley 11 and limiting wheel 10.

[0083] In this embodiment, a sealing plate 16 is provided on one side of the mounting shell 5, which is used to seal the opening of the mounting shell 5.

[0084] In this embodiment, the top of the mounting shell 5 is provided with two vertical holes 15, and one end of each of the two pull ropes 12 passes through the two vertical holes 15 respectively.

[0085] In this embodiment, a control screen 6 is provided on the outer side of the mounting shell 5.

[0086] In this embodiment, the outer side of the support plate 4 is covered with a soft pad.

[0087] In this embodiment, both the left drum 18 and the right drum are equipped with one-way bearings.

[0088] In this embodiment, a fixing base 23 is fixedly installed on the top of the mounting shell 5. A reset groove 24 is provided on one side of the fixing base 23. A positioning plate 25 is slidably installed in the reset groove 24. A vertical plate 26 is fixedly installed on the top of the sealing plate 16. A positioning hole 27 is provided on the vertical plate 26. One side of the positioning plate 25 is engaged with the positioning hole 27. A first spring is fixedly installed on the other side of the positioning plate 25. One end of the first spring is fixedly connected to the inner wall of one side of the reset groove 24. Two T-shaped plates 22 are fixedly installed on one side of the mounting shell 5. Two T-shaped insertion holes 21 are provided on one side of the sealing plate 16. The outer sides of the two T-shaped plates 22 are in contact with the inner walls of the two T-shaped insertion holes 21 respectively. When it is necessary to open the sealing plate 16 to inspect the electrical appliances in the mounting shell 5, the positioning plate 25 is pressed to disengage from the positioning hole 27. The positioning plate 25 compresses the first spring, releases the fixing of the vertical plate 26, and pushes the sealing plate 16 horizontally to separate the T-shaped plates 22 from the T-shaped insertion holes 21, so that the sealing plate 16 can be removed.

[0089] In this embodiment, slots 28 are provided on the top of both support plates 3, and two inserts 29 are fixedly installed on the bottom of the bearing plate 4. The two inserts 29 are respectively engaged with the two slots 28. Locking grooves are provided on the sides of the two inserts 29 that are close to each other. A horizontal plate 39 is fixedly installed between the two support plates 3. A rectangular vertical hole 31 is provided on the top of the horizontal plate 39. Rectangular sliding plates 32 are slidably installed in the two rectangular vertical holes 31. Locking plates 33 are fixedly installed on the sides of the two rectangular sliding plates 32 that are far from each other. Connecting horizontal holes 30 are provided on the inner walls of one side of each of the two slots 28. One side of each locking plate 33 passes through the two connecting horizontal holes 30 and the two locking grooves. The two rectangular slide plates 32 are each fixedly mounted with one end of a second spring 34 on one side that is close to each other. The other end of the second spring 34 is fixedly connected to the inner wall of one side of the rectangular vertical hole 31. A limit groove 40 is opened on the side wall of the rectangular vertical hole 31. A limit block 41 is fixedly mounted on the outside of the rectangular slide plate 32. The outside of the limit block 41 slides in contact with the inner wall of the limit groove 40. A rotating shaft 35 is rotatably mounted on the horizontal plate 39. An elliptical plate 36 is fixedly mounted on the top of the rotating shaft 35. One end of two pull rods 38 is rotatably mounted on the top of the elliptical plate 36. The other ends of the two pull rods 38 are rotatably connected to the two rectangular slide plates 32 respectively. A rotating block 37 is fixedly mounted on the bottom end of the rotating shaft 35.

[0090] When the support plate 4 needs to be replaced, rotate the rotating block 37. The rotating block 37 drives the rotating shaft 35 to rotate, the rotating shaft 35 drives the elliptical plate 36 to rotate, and the elliptical plate 36 drives one end of the two pull rods 38 to move eccentrically, which in turn drives the two rectangular slide plates 32 to move closer to each other. The two rectangular slide plates 32 drive the two locking plates 33 to move closer to each other, so that the two locking plates 33 disengage from the two locking slots. At this time, the two second springs 34 are compressed, releasing the fixation of the two inserts 29. Pull the support plate 4 upward, so that the two inserts 29 disengage from the two slots 28, and remove the support plate 4.

[0091] The rest is the same as in Example 1.

[0092] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A V-force swimming land-based training device with water-catching and water-pushing functions, characterized in that, include: A bottom frame for support, on which support components are mounted for athletes to lie prone; Mounting housing (5) is fixedly installed on the top of the bottom frame. A motor (17) is installed inside the mounting housing (5). The motor (17) is connected to a left drum (18) and a right drum. Photoelectric devices are installed on the output shaft of the motor (17), the left drum (18) and the right drum. The optoelectronic device includes a code disk (19) and a slotted optocoupler (20); Two pull ropes (12) are installed on the left drum (18) and the right drum respectively. One end of each pull rope (12) is fixedly connected to an installation rod (13), and one end of each installation rod (13) is fixedly installed with a handle (14). A pulley assembly, mounted on top of the bottom frame, is used to guide the two pull ropes (12).

2. The V-force swimming land-based training device with water-catching and water-pushing functions according to claim 1, characterized in that, The bottom frame includes two crossbars (1), which are fixedly installed between multiple vertical bars (2), and the bottom of the mounting shell (5) is fixedly connected to the top of the two crossbars (1).

3. A V-force swimming land-based training device with water-catching and water-pushing functions according to claim 2, characterized in that, The support assembly includes two support plates (3), which are mounted on the top of two corresponding longitudinal bars (2). The top of the two support plates (3) is provided with the same bearing plate (4) for athletes to lie on.

4. A V-force swimming land-based training device with water-catching and water-pushing functions according to claim 3, characterized in that, The pulley assembly includes two vertical rods (7), which are fixedly installed on the top of two horizontal rods (1), and a stabilizing rod (8) is fixedly installed between the two vertical rods (7).

5. A V-force swimming land-based training device with water-catching and water-pushing functions according to claim 4, characterized in that, A fixed housing (9) is fixedly installed on one side of each of the two vertical rods (7). A pulley (11) and a limit wheel (10) are rotatably installed inside each of the two fixed housings (9). The pull rope (12) cooperates with the corresponding pulley (11) and limit wheel (10).

6. A V-force swimming land-based training device with water-catching and water-pushing functions according to claim 5, characterized in that, The mounting shell (5) has a sealing plate (16) on one side, which is used to seal the opening of the mounting shell (5).

7. A V-force swimming land-based training device with water-catching and water-pushing functions according to claim 6, characterized in that, The top of the mounting shell (5) is provided with two vertical holes (15), and one end of each of the two pull ropes (12) passes through the two vertical holes (15).

8. A V-force swimming land-based training device with water-catching and water-pushing functions according to claim 7, characterized in that, The outer side of the mounting housing (5) is provided with a control screen (6).

9. A V-force swimming land-based training device with water-catching and water-pushing functions according to claim 8, characterized in that, The outer side of the support plate (4) is covered with a soft pad.

10. A V-force swimming land-based training device with water-catching and water-pushing functions according to claim 9, characterized in that, Both the left drum (18) and the right drum are equipped with one-way bearings.

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