A single-frame, plate-operated, dual-function biceps and triceps trainer

Abstract

This invention discloses a single-frame, plate-type dual-function biceps and triceps trainer, belonging to the field of fitness equipment technology. It includes a main frame, a plate-type counterweight unit, a seat unit, an elbow pad unit, and a training execution unit. The top of both sides of the front end of the main frame is integrally formed with rearward-bent support sections. The plate-type counterweight unit is located at the rear end of the main frame. The plate-type counterweight unit includes a counterweight box, with door frames fixed to both sides of the counterweight box. A steel wire rope and a counterweight module are disposed inside the counterweight box. The middle end of the steel wire rope is connected to the lifting end at the top of the counterweight module, and both ends of the steel wire rope are led out of the counterweight box through guide units. The seat unit is fixed to the middle of the front end of the main frame. This single-frame, plate-type dual-function biceps and triceps trainer can simultaneously meet the needs of independent training and synergistic quantitative assessment of the antagonistic muscle groups of the upper arm.

Description

Technical Field

[0001] This invention specifically relates to a single-frame insert-type dual-function biceps and triceps trainer, belonging to the field of fitness equipment technology. Background Technology

[0002] Muscle training devices are used to enhance muscle strength, improve cardiopulmonary function, increase flexibility, and shape the body. There are many types of muscle training devices, generally classified according to the different muscle groups they train. Devices that train the biceps and triceps are called biceps and triceps muscle training devices. Existing biceps and triceps training devices include a biceps and triceps rehabilitation training machine disclosed in Chinese Patent Publication No. CN112773665A. This structure uses the elasticity of springs to stimulate the user's biceps and triceps muscles to achieve a rehabilitation training effect. However, most existing dual-function biceps and triceps trainers are one-piece structures with a single resistance loop, requiring both arms to... Using the same combination of weights and the same exercise mode makes it impossible to independently select training modes for the left and right arms, making it difficult to conduct differentiated training based on unilateral muscle strength differences, and also impossible to complete synchronous comparative assessment of antagonistic muscles. Some training devices with assessment functions can only achieve simple movement counting and stroke statistics through angle sensors, and cannot identify deformation problems such as posture compensation and inertial swinging during the movement. The training volume statistics are only based on rough calculations of mechanical work, which have a large deviation from the actual effective load on the muscles. At the same time, the antagonistic muscle strength assessment of existing devices requires manual comparison of data after completing two sets of training. Inconsistent testing conditions lead to large errors in the assessment results, making it impossible to provide users with accurate guidance on muscle balance. Summary of the Invention

[0003] To address the aforementioned issues, this invention proposes a single-frame insert-type dual-function biceps and triceps trainer that can simultaneously meet the needs of independent training and synergistic quantitative assessment of the antagonistic muscle groups of the upper arm.

[0004] The single-frame insert type biceps and triceps dual-function trainer of the present invention includes: The main frame has support sections that are bent backwards on both sides of the front end of the main frame. The insert-type counterweight unit is located at the rear end of the main frame body. The insert-type counterweight unit includes a counterweight box with door frames fixed to both sides of its exterior. A steel wire rope and a counterweight module are installed inside the counterweight box. The middle end of the steel wire rope is connected to the lifting end at the top of the counterweight module, and both ends of the steel wire rope are led out of the counterweight box through guide units. The insert-type counterweight unit adopts a split-action structure with a single counterweight module and two independent steel wire ropes. The left and right training circuits share the same counterweight module, and the actions on both sides do not interfere with each other. When one side moves, only the corresponding side's steel wire rope is pulled to complete the counterweight lifting, ensuring consistent training resistance on both sides. A seat cushion unit, which is fixed to the middle of the front end of the main frame; An elbow pad unit, comprising corner seats fixed on both sides within a support section, a pad fixed between the corner seats, and an elbow pad body fixed on the top surface of the pad. The training execution unit includes a boom body and an eccentric disc. Multiple adjustment holes are spaced circumferentially around the inner edge of the eccentric disc. An arc-shaped groove is integrally formed on the outer edge of the eccentric disc. The upper part of the boom body and the center of the eccentric disc are hinged between a support section and a corner seat via a pin. Swing plates are hinged to both sides of the eccentric disc via the pin, and guide wheels are rotatably mounted on the outer circumference of the eccentric disc via the swing plates. A pull column is vertically fixed to the inner lower part of the boom body, and a handle is fixed to the pull column. A first elastic pin is fixed to the upper part of the boom body, movably engaging with the adjustment holes. Multiple outer transition wheels are rotatably mounted along the inner edge of the main frame. The wire rope, after being led out from the counterweight box, passes sequentially through the outer transition wheels and guide wheels, and is fixed to the arc-shaped groove. A check pin is fixed on the support section, abutting against the swing plates. A thrust stop pin is fixed on the eccentric disc, abutting against the swing plates.

[0005] During operation, the weight is selected via the insert-type counterweight unit, and a training mode is chosen. The training mode is one of the following: biceps-biceps, triceps-triceps, biceps-triceps, or triceps-biceps. After selecting the training mode, the seat height is adjusted to begin arm training. During training, the left and right arms are placed on the elbow pads of the elbow pad unit. The training execution unit selection for the training mode is as follows: When the left or right handle is selected for biceps, the first elastic pin is pulled out. The pin of the first elastic pin disengages from the adjustment hole of the eccentric disc. At this point, the boom body and the eccentric disc separate, and the eccentric disc is subjected to... The tension of the steel wire rope is used to limit the position. Then, the boom body is rotated downwards to align the first elastic pin with the adjustment hole below the eccentric disc, and the first elastic pin is released, thus relocking the boom body and the eccentric disc. At this time, the handle is in the low position. During training, the boom body is rotated upwards by bending the arm. During the upward rotation, the eccentric disc rotates synchronously through the first elastic pin. During rotation, because the swing plate is restricted by the check pin, the guide wheel on the swing plate remains stationary, only guiding the steel wire rope. The eccentric disc rotates and winds the steel wire rope. The steel wire rope pulls the lifting end at the top of the counterweight module through the guide wheel, the outer transition wheel, and the guide unit, thereby causing the counterweight to move. The module is lifted in a straight line. After the arm is curled to the maximum position, the arm is slowly extended. Using the counterweight module, the moving arm and the eccentric disc are returned to their original positions, completing one set of biceps training. When the left or right handle is selected for the triceps, first pull out the first elastic pin. The pin of the first elastic pin disengages from the adjustment hole of the eccentric disc. At this time, the moving arm and the eccentric disc are separated, and the eccentric disc is positioned by the tension of the steel cable. Next, rotate the moving arm upward to align the first elastic pin with the adjustment hole above the eccentric disc, and then release the first elastic pin to relock the moving arm and the eccentric disc. At this time, the handle is in a high position. During training, the moving arm is lowered by pressing down with the arm. During upward and downward rotation, the eccentric disc rotates synchronously via the first elastic pin. During rotation, the swing plate is restricted by the thrust stop pin on the eccentric disc. As the eccentric disc rotates, the thrust stop pin synchronously pushes the swing plate to rotate. At this time, the guide wheel rotates and swings synchronously with the eccentric disc. When the guide wheel rotates, it synchronously swings and pulls the steel wire rope. The steel wire rope pulls the lifting end of the top of the counterweight module through the guide wheel, outer transition wheel, and guide unit, thereby lifting the counterweight module in a straight line. After the arm is pressed down to the position, the arm is slowly bent back. Using the traction of the counterweight module, the boom body and the eccentric disc are reset, completing one set of triceps training.

[0006] Switching between the two training modes can be completed simply by operating the first elastic pin to adjust the boom gear position. There is no need to change the wire rope routing or adjust the counterweight structure. The operation is convenient and the gear locking is reliable. There is no risk of mode slippage during training. In both modes, the counterweight module is only subjected to an upward lifting force and relies on its own weight to provide constant resistance. The direction of resistance and the direction of force always correspond throughout the entire movement, with no reverse idle stroke.

[0007] Furthermore, the bottom of the main frame is fixed with foot covers, which can provide anti-slip support for the main frame.

[0008] Furthermore, the guiding unit includes a lower wheel seat fixed to the top lifting end of the weight module, on which a lifting wheel is rotatably mounted; multiple upper wheel seats are fixed side-by-side on both sides of the lower wheel seat at the top of the inner side of the weight box, on which an inner transition wheel is rotatably mounted; and guide wheels are rotatably mounted on the middle of both sides of the inner side of the weight box via wheel seats; a steel wire rope is sleeved on the lifting wheel, and both ends of the steel wire rope are led out of the weight box through the inner transition wheel and the guide wheel in sequence; when the left and right arms are trained, whether biceps or triceps are trained, the steel wire rope will be pulled, and the steel wire rope will be pulled into the inner side of the weight box through the guide wheel and the outer transition wheel. The steel wire rope will then pull the top lifting end of the weight module through the guide wheel, the inner transition wheel and the lifting wheel in sequence, causing the weight module to move upward in a straight line, providing resistance for biceps curls and triceps pushdowns.

[0009] Furthermore, the main frame includes two horizontal side beams, the rear end of which is fixed to the door frame, and the front end of which is fixed to a corner-structured vertical beam. The support section is integrally formed on the top of the vertical beam. A middle beam is provided at the bottom between the vertical beams, the front end of which is fixed to the counterweight box, and a connecting rod is fixed between the middle beam and the vertical beam. The outer transition wheel is rotatably disposed inside the horizontal side beam. The horizontal side beam, vertical beam, middle beam, and connecting rod form a three-dimensional support structure. This structure is used to support and fix the insert-type counterweight unit, and also serves as a support for the external guide assembly of the wire rope and the seat cushion unit.

[0010] Furthermore, the seat cushion unit includes a support leg fixed to the rear end of the central beam, with a square tube positioned directly opposite the front end of the support leg; upper and lower connecting plates are hinged to both sides of the support leg and the square tube; an adjustment plate is fixed to the side of the support leg near the square tube, and the adjustment plate has multiple adjustment holes spaced apart along an arc direction; a lower edge is integrally formed in the middle of the bottom surface of one of the upper connecting plates, and a second elastic pin is fixed to the lower edge and movably inserted into the adjustment hole; a cylinder or damper is hinged between the lower part of the support leg and the upper part of the square tube; a seat cushion is fixed to the top of the square tube; when adjusting the height of the seat cushion unit, the second elastic pin is pulled out, and the square tube is pushed up or pulled down. The upper and lower connecting plates swing up and down synchronously. During the swing, a cylinder or damper provides a buffering force. After adjustment, the second elastic pin is released, and the square tube swings up and down to make the pin of the second elastic pin engage with the adjustment hole of the adjustment plate; the seat cushion height is then re-locked. The seat cushion unit adopts a parallelogram linkage lifting structure, so the seat cushion always remains horizontal during adjustment and there will be no change in the front and back tilt angle, ensuring the stability and comfort of the sitting posture for users of different heights. The cylinder or damper can offset part of the weight of the seat cushion and the human body. There is no need to lift it with effort during adjustment; it can slowly fall back when released, improving the safety and convenience of the adjustment operation.

[0011] Furthermore, an adjustment handle is vertically fixed to the lower outer side of the boom body. The adjustment handle facilitates the rotation and swing of the boom body, making it easy to adjust the boom body to a comfortable exercise position and facilitates the switching between biceps and triceps modes.

[0012] Furthermore, a rotary encoder is installed between the center of the enamel disc and the corner seat, the rotary encoder being fixed to the corner seat, and the pin shaft moving through the rotary encoder; a tension gauge is installed between the lower wheel seat and the top lifting end of the counterweight module; a proximity switch is installed on the back of the enamel disc at each adjustment hole; the rotary encoder, tension gauge, and proximity switches are connected to the control host; the control host has a built-in training result evaluation unit; the tension gauge can collect the dynamic tension value of the wire rope in real time, which can not only directly calculate the current total weight of the counterweight, but also capture the tension fluctuation during the movement. Combined with the angle data of the rotary encoder, it can more accurately identify the movement states such as inertial swinging and static stop, further improving the accuracy of training volume calculation and movement standard evaluation; the proximity switch adopts non-contact triggering, has a long service life and reliable triggering, and can automatically upload the mode signal after the gear switching is completed, without the need for manual confirmation.

[0013] Furthermore, conductive silicone electrodes are respectively provided on the front and rear ends of both sides of the top surface of the elbow pad; the conductive silicone electrodes are connected to the control host; the conductive silicone electrodes are embedded and flush with the surface of the elbow pad, with no protruding structure on the surface, so as not to cause pressure discomfort to the skin of the arm; the electrodes adopt the principle of high frequency AC impedance detection, which is not affected by dry skin or slight sweating, and can still stably identify the contact state and relative displacement of the arm in the exercise state, without the need to apply conductive medium, making it clean to use and easy to maintain.

[0014] Furthermore, the training result evaluation unit includes an evaluation calculation unit, which is connected to the effective training volume calculation unit, the movement standard evaluation unit, and the antagonistic muscle balance evaluation unit, respectively; the evaluation calculation unit is also connected to an output and interaction module.

[0015] Furthermore, during the assessment by the antagonistic muscle balance assessment unit, the two sets of boom bodies are respectively set to biceps brachii mode and triceps brachii mode, and the bilateral conductive silicone electrodes are simultaneously in place.

[0016] Compared with existing technologies, the single-frame insert-type dual-function biceps and triceps trainer of the present invention can be widely used in commercial gyms, community fitness centers and home fitness scenarios, and can simultaneously meet the needs of independent training and synergistic quantitative assessment of the upper arm antagonistic muscle groups, as detailed below: First, it adopts a split-action dual-circuit structure and gear switching mechanism to enable independent selection of biceps or triceps training modes for the left and right arms. It can complete synchronous training of the same muscle group on both sides, as well as superset training of antagonistic muscles, adapting to more training programs and meeting the differentiated training needs of different users. Second, sensor data is acquired through rotary encoders, force gauges, proximity switches and conductive silicone electrodes to construct multimodal data. Quantitative evaluation results are output from three dimensions: effective training volume, movement standardization, and antagonistic muscle balance. Compared with single counting-based evaluation, this is more in line with actual training effects and can accurately locate movement deformation problems and weak muscle strength. Third, the use of conductive silicone electrodes enables automatic recognition of arm status, automatic start and stop and automatic counting throughout the training process, without the need for manual operation of the interactive interface, resulting in a smooth user experience; the weight, training mode and initial angle are all automatically recognized and calibrated to avoid human setting errors and make the evaluation data more consistent. Fourth, relying on the bilateral heterogeneous training structure, it enables simultaneous assessment of antagonistic muscles under the same load and state, eliminating the state difference error of traditional fractional measurement, resulting in higher accuracy of assessment results and providing users with more valuable guidance on muscle strength balance. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the first three-dimensional structure of the dual-function trainer of the present invention.

[0018] Figure 2 For the present invention Figure 1 A magnified schematic diagram of the structure at point A in the middle.

[0019] Figure 3 For the present invention Figure 1 A magnified schematic diagram of the structure at point B in the middle.

[0020] Figure 4 This is a schematic diagram of the second three-dimensional structure of the dual-function trainer of the present invention.

[0021] Figure 5 This is a top view of the dual-function trainer of the present invention.

[0022] Figure 6 This is a bottom-view structural diagram of the dual-function trainer of the present invention.

[0023] Figure 7 This is a schematic diagram of the front structure of the dual-function trainer of the present invention.

[0024] Figure 8 This is a schematic diagram of the right side of the dual-function trainer of the present invention.

[0025] Figure 9 This is a schematic diagram of the left side structure of the dual-function trainer of the present invention.

[0026] Figure 10 For the present invention Figure 9 Schematic diagram of the cross-section structure of line AA in the middle.

[0027] Figure 11 For the present invention Figure 9 Schematic diagram of the cross-sectional structure of the BB line.

[0028] Reference numerals: 1. Seat cushion unit; 2. Support section; 3. Insert-type counterweight unit; 4. Steel wire rope; 5. Counterweight module; 6. Corner seat; 7. Cushion; 8. Elbow pad; 9. Boom body; 10. Enamel plate; 11. Adjustment hole; 12. Arc-shaped groove; 13. Swing plate; 14. Guide wheel; 15. Pull column; 16. Handle; 17. First elastic pin; 18. Outer transition wheel; 19. Check pin; 20. 21. Thrust stop pin; 22. Foot cover; 23. Lifting wheel; 24. Inner transition wheel; 25. Guide wheel; 26. Horizontal side beam; 27. Vertical beam; 28. Middle beam; 29. ​​Connecting rod; 30. Support leg; 31. Square tube; 32. Upper connecting plate; 33. Lower connecting plate; 34. Adjustment plate; 35. Adjustment hole; 36. Lower edge; 37. Second elastic pin; 38. Damper; 39. Seat cushion; 30. Adjustment handle. Detailed Implementation

[0029] Example 1: like Figures 1 to 11 The single-frame, plate-operated, dual-function biceps and triceps trainer shown includes: The main frame has support sections 2 that are bent backwards on both sides of the front end of the main frame. The insert-type counterweight unit 3 is located at the rear end of the main frame body. The insert-type counterweight unit 3 includes a counterweight box, with door frames fixed on both sides of the outside of the counterweight box. A steel wire rope 4 and a counterweight module 5 are provided inside the counterweight box. The middle end of the steel wire rope 4 is hooked to the lifting end at the top of the counterweight module 5, and both ends of the steel wire rope 4 are led out of the counterweight box through guide units. Seat cushion unit 1, wherein the seat cushion unit 1 is fixed to the middle of the front end of the main frame; Elbow pad unit, the elbow pad unit includes corner seats 6 fixed on both sides inside the support section 2, a pad 7 fixed between the corner seats 6, and an elbow pad body 8 fixed on the top surface of the pad 7. The training execution unit includes a boom body 9 and an eccentric disc 10. Multiple adjustment holes 11 are spaced circumferentially around the inner edge of the eccentric disc 10. An arc-shaped groove 12 is integrally formed on the outer surface of the eccentric disc 10. The upper part of the boom body 9 and the center of the eccentric disc 10 are hinged between the support section 2 and the corner seat 6 via a pin. Swing plates 13 are hinged to both sides of the eccentric disc 10 via the pin, and guide wheels 14 are rotatably mounted on the outer periphery of the eccentric disc 10 on the swing plates 13. A tension rod is vertically fixed to the inner lower part of the boom body 9. The column 15 has a handle 16 fixed on it; the upper part of the boom body 9 has a first elastic pin 17 that is movably inserted into the adjustment hole 11; multiple outer transition wheels 18 are rotatably arranged along the inner edge of the main frame body; the wire rope 4 is led out from the counterweight box, passes through the outer transition wheels 18 and the guide wheel 14 in sequence, and is fixed to the arc-shaped groove 12; the support section 2 has a check pin 19 that abuts against the swing plate 13; the eccentric disc 10 has a thrust stop pin 20 that abuts against the swing plate 13.

[0030] During operation, the weight is selected via the insert-type counterweight unit 3, and a training mode is chosen. The training mode can be one of biceps-biceps, triceps-triceps, biceps-triceps, or triceps-biceps. After selecting the training mode, the height of the seat unit 1 is adjusted to begin arm training. During training, the left and right arms are placed on the elbow pads 8 of the elbow pad unit. The training execution unit selection for the training mode is as follows: when the left or right handle 16 selects biceps, the first elastic pin 17 is pulled out. The pin of the first elastic pin 17 disengages from the adjustment hole 11 of the eccentric disc 10. At this time, the boom body 9 and the eccentric disc 10 separate, and the eccentric disc 10 is positioned by the tension of the steel wire rope 4. Then, the boom body 9 is rotated downwards, aligning the first elastic pin 17 with the adjustment hole 11 below the eccentric disc 10, and the first elastic pin 17 is released, thus relocking the boom body 9 and the eccentric disc 10. At this time, the handle 16 is in the low position. During training, the boom body 9 is rotated upwards by arm curls. During the upward rotation, the eccentric disc 10 is rotated synchronously through the first elastic pin 17. During rotation, because the swing plate 13 is restricted by the return pin 19, the guide wheel 14 on the swing plate 13 remains stationary, only guiding the steel wire rope 4. The eccentric disc 10 rotates to wind the steel wire rope 4. The steel wire rope 4 is pulled by the guide wheel 14, the outer transition wheel 18 and the guide unit to the lifting end of the top of the counterweight module 5, thereby causing the counterweight module 5 to move in a straight line. After lifting and curling the arm to its maximum position, slowly extend the arm and use the counterweight module 5 to pull the arm body 9 and the eccentric disc 10 back to their original positions, completing one set of biceps training. When the left or right handle 16 is selected for the triceps, first pull out the first elastic pin 17. The pin of the first elastic pin 17 disengages from the adjustment hole 11 of the eccentric disc 10. At this time, the arm body 9 and the eccentric disc 10 are separated, and the eccentric disc 10 is positioned by the tension of the steel cable 4. Then, rotate the arm body 9 upward to align the first elastic pin 17 with the adjustment hole 11 above the eccentric disc 10, and release the first elastic pin 17 to relock the arm body 9 and the eccentric disc 10. At this time, the handle 16 is in a high position. During training, the arm body 9 is rotated upward by pressing down with the arm. When the arm is pressed down, the first elastic pin 17 causes the eccentric plate 10 to rotate synchronously. During rotation, the swing plate 13 is restricted by the thrust stop pin 20 on the eccentric plate 10. When the eccentric plate 10 rotates, the thrust stop pin 20 pushes the swing plate 13 to rotate synchronously. At this time, the guide wheel 14 rotates and swings synchronously with the eccentric plate 10. When the guide wheel 14 rotates, it pulls the steel wire rope 4 synchronously. The steel wire rope 4 pulls the lifting end of the top of the counterweight module 5 through the guide wheel 14, the outer transition wheel 18 and the guide unit, so that the counterweight module 5 is lifted in a straight line. After the arm is pressed down to the position, the arm is slowly bent back. The arm body 9 and the eccentric plate 10 are reset by the pull of the counterweight module 5, thus completing a set of triceps training.

[0031] The bottom of the main frame is fixed with foot covers 21, which can provide anti-slip support for the main frame.

[0032] The guiding unit includes a lower wheel seat fixed to the top lifting end of the weight module 5, on which a lifting wheel 22 is rotatably mounted; multiple upper wheel seats are fixed side by side on both sides of the top of the inner side of the weight box, on which an inner transition wheel 23 is rotatably mounted; and guide wheels 24 are rotatably mounted on the middle of both sides of the inner side of the weight box via wheel seats; a steel wire rope 4 is sleeved on the lifting wheel 22, and both ends of the steel wire rope 4 are led out of the weight box through the inner transition wheel 23 and the guide wheel 24 in sequence; when the left and right arms are trained, whether biceps or triceps are trained, the steel wire rope 4 will be pulled. The steel wire rope 4 is pulled into the inner side of the weight box through the guide wheel 14 and the outer transition wheel 18. The steel wire rope 4 is pulled through the guide wheel 24, the inner transition wheel 23 and the lifting wheel 22 in sequence to lift the top lifting end of the weight module 5, so that the weight module 5 moves upward in a straight line, providing resistance for biceps curls and triceps pushdowns.

[0033] The main frame includes two horizontal side beams 25. The rear end of the horizontal side beams 25 is fixed to the door frame, and the front end of the horizontal side beams 25 is fixed to a corner-structured vertical beam 26. The support section 2 is integrally formed on the top of the vertical beam 26. A middle beam 27 is provided at the lower part between the vertical beams 26. The front end of the middle beam 27 is fixed to the counterweight box. A connecting rod 28 is fixed between the middle beam 27 and the vertical beams 26. The outer transition wheel 18 is rotatably disposed inside the horizontal side beams 25. The horizontal side beams 25, vertical beams 26, middle beams 27 and connecting rods 28 form a three-dimensional support structure. It is used to support and fix the insert-type counterweight unit 3, and also serves as a support for the external guide assembly of the wire rope 4 and the seat cushion unit 1.

[0034] The seat cushion unit 1 includes a support leg 29 fixed to the rear end of the central beam 27, with a square tube 30 positioned directly opposite the front end of the support leg 29; upper connecting plates 31 and lower connecting plates 32 are hinged to both sides of the support leg 29 and the square tube 30; an adjustment plate 33 is fixed to the side of the support leg 29 near the square tube 30, and the adjustment plate 33 has multiple adjustment holes 34 spaced apart along an arc direction; a lower edge 35 is integrally formed in the middle of the bottom surface of one of the upper connecting plates 31, and a second elastic pin 36 is fixed on the lower edge 35 and movably inserted into the adjustment holes 34; A cylinder or damper 37 is hinged between the lower part of the support leg 29 and the upper part of the square tube 30; a seat cushion 38 is fixed to the top of the square tube 30; when adjusting the height of the seat cushion unit 1, the second elastic pin 36 is pulled out, the square tube 30 is pushed up or pulled down, and the upper connecting plate 31 and the lower connecting plate 32 swing up and down synchronously. During the swing, the cylinder or damper 37 provides a buffering force. After the adjustment is in place, the second elastic pin 36 is released, and the square tube 30 is swung up and down so that the pin of the second elastic pin 36 is inserted into the adjustment hole 34 of the adjustment plate 33; the height of the seat cushion 38 is locked again.

[0035] The lower outer side of the arm body 9 is vertically fixed with an adjustment handle 39, which facilitates the rotation and swing of the arm body 9, allowing the arm body 9 to be adjusted to a comfortable exercise position and facilitating the switching between biceps and triceps modes.

[0036] A rotary encoder is provided between the center of the enamel disc 10 and the corner seat 6. The rotary encoder is fixed to the corner seat 6, and the pin shaft moves through the rotary encoder. A tension gauge is installed between the lower wheel seat and the top lifting end of the counterweight module 5. A proximity switch is installed on the back of the enamel disc 10 at each adjustment hole 11. The rotary encoder, tension gauge, and proximity switch are connected to the control host. The control host has a built-in training result evaluation unit.

[0037] The elbow pad 8 has conductive silicone electrodes on both sides of its top surface at the front and rear ends; the conductive silicone electrodes are connected to the control host.

[0038] The training result evaluation unit includes an evaluation calculation unit, which is connected to the effective training volume calculation unit, the movement standard evaluation unit, and the antagonistic muscle balance evaluation unit; the evaluation calculation unit is also connected to an output and interaction module.

[0039] During the assessment by the antagonistic muscle balance assessment unit, the two sets of boom bodies 9 are set to biceps brachii mode and triceps brachii mode respectively, and the bilateral conductive silicone electrodes are simultaneously in place.

[0040] The dual-function trainer has a dual-sided independent architecture, with each side of the boom body 9 equipped with a set of data acquisition units. After data synchronization and alignment, it is processed uniformly. The operation process of the control host is as follows: First, rotation angle is acquired by using a rotary encoder to acquire the rotation angle of the enamel disc 10. The rotary encoder is an absolute rotary encoder, with the stator fixed on the corner bracket 6 and the rotor rigidly connected to the center end of the enamel disc 10, rotating synchronously with the boom body 9 and the enamel disc 10. The rotary encoder acquires parameters such as real-time absolute angle (resolution ≤ 0.5°), angular velocity, angular acceleration, and rotation direction, with a sampling frequency of 50Hz. The rotary encoder is used to divide the action phase, calculate the motion stroke, and identify the force application rhythm. Secondly, initial angle acquisition and training mode acquisition are performed by installing proximity switches at all adjustment holes 11 of the enamel plate 10. The proximity switches are triggered or disengaged by the first elastic pin 17. The adjustment holes 11 are divided into biceps and triceps groups according to their functions, and the corresponding nominal starting angles are pre-stored. When the first elastic pin 17 is engaged in the corresponding adjustment hole 11, the corresponding proximity switch is triggered, and the control host automatically identifies the current training mode (biceps / triceps) and gear number on that side. After locking, the rotary encoder synchronously reads the current absolute angle value and automatically calibrates it as the zero position (initial angle) of the action in this training on that side, eliminating the deviation of the starting angle between different gears. All subsequent stroke calculations are based on this. The proximity switches eliminate the need for manual setting of training modes and reference angles. After gear switching, the corresponding evaluation algorithm is automatically matched to ensure consistent stroke calculation accuracy under different gears. Next, the weight of the counterweight is obtained. By setting a tension gauge between the lower wheel seat and the top lifting end of the counterweight module 5, the total mass of the counterweight lifted by the wire rope 4 can be directly obtained, providing load parameters for training volume calculation. The data is collected automatically throughout the process without manual input, avoiding human error in setting. Finally, arm status recognition is performed. Conductive silicone electrodes are installed on the surface of the elbow pad 8, facing the forearms and hamstrings of the left and right hands. Two conductive silicone electrodes are used to form a detection pair. The conductive silicone electrodes are flush with the pad surface. During training, the forearms and hamstrings can naturally adhere to each other to form effective contact. During detection, the contact impedance change between the skin and the conductive silicone electrodes is detected by high-frequency AC impedance to identify the arm status. For example, in the in-position state: the impedance of both electrodes falls within the preset normal contact range, indicating that the forearm is fully attached to the support pad, and the evaluation system automatically activates counting; in the sliding displacement state: during the movement, the difference in impedance between the front and rear conductive silicone electrodes fluctuates beyond the threshold, indicating that the forearm has moved back and forth, raised the elbow, or undergone other posture deformations. The greater the displacement, the greater the degree of deformation; in the disengaged state: the impedance exceeds the threshold range, indicating that the arm has left the pad surface, and counting and evaluation are automatically paused.

[0041] The training result evaluation unit works as follows: The effective training volume calculation unit calculates the effective training volume based on mechanical work, and makes effectiveness corrections by combining contact state and posture deformation, outputting quantitative results that truly reflect the training load. Theoretical work done in a single operation: based on the counterweight mass mg, the winding radius of the 10mm disc (pre-calibration constant r), and the measured rotational radius θ of the rotary encoder; calculation: W0 = mg.θ.r; Effectiveness control: The conductive silicone electrode remains in place throughout the entire movement, and the actual stroke is greater than or equal to the effective stroke threshold of this mode, which is considered an effective movement; detachment midway or insufficient stroke are not included in the statistics; Slippage correction: If the conductive silicone electrode detects forearm slippage during the movement, the effective coefficient k (value 0.6~1.0) is calculated according to the impedance offset ratio, and the effective work done in a single operation is W=W0×k; Total training volume: The sum of the effective work done in a single repetition of all effective movements, and the concentric and eccentric phases can be counted separately.

[0042] II. The movement standardization assessment unit evaluates movement standardization using a weighted average of rhythm and posture, directly outputting a score from 0 to 100, while accurately identifying the type of variation, as detailed below: Rhythm compliance (50% weight, rotary encoder dimension): Calculate the coefficient of variation of angular acceleration during the centripetal phase. The smaller the coefficient of variation, the more stable the force application, and the higher the score. The appearance of instantaneous angular acceleration peaks is judged as inertial swinging, and points are deducted according to the peak amplitude. Posture compliance (50% weight, conductive silicone electrode dimension): Calculate the maximum fluctuation difference of the impedance of the conductive silicone electrodes before and after a single movement. The smaller the difference, the more stable the forearm posture, and the higher the score. Fluctuations exceeding the threshold are judged as elbow raising and sliding compensation, and points are deducted according to the deviation ratio.

[0043] The automatic deviation positioning judgment is as follows: low rhythm score and high posture score indicate a swinging motion with leverage; low posture score and high rhythm score indicate a posture deformation; both low scores indicate an overall non-standard movement. III. The assessment process of the antagonistic muscle balance assessment unit is as follows: It relies entirely on the independent selection of training mode structures for the left and right arms to achieve antagonistic muscle assessment under the same load and synchronous state, resulting in a much higher accuracy than fractional measurements. The trigger condition is that the control host identifies the left and right sides as biceps and triceps modes respectively, and both conductive silicone electrodes are simultaneously in place. Synchronization verification: if the difference in the starting time of the bilateral movements is ≤150ms and the phase difference is ≤10°, it is determined to be a synchronous effective group and included in the balance assessment; asynchronous movements are directly eliminated to remove errors caused by state differences. Antagonistic muscle strength balance ratio calculation: Combining the counterweight, disc 10, and peak angular acceleration of the rotary encoder, the maximum output torque of both sides is calculated to obtain the torque ratio of the biceps and triceps. Then, the calculated value is compared with the healthy baseline range of the same population (reference value 1.5:1~2:1). A ratio within the range indicates balance; a deviation of less than 20% indicates mild imbalance; a deviation of more than 20% indicates severe imbalance, and weak muscle groups are simultaneously marked. The output and interaction modules provide real-time feedback, training evaluation, and automatic start / stop, respectively. Real-time feedback displays the effective work done and standard score of a single movement after completion, and provides immediate feedback on the type of deviation for abnormal movements (such as swinging with momentum or forearm sliding). Training evaluation outputs the total effective training volume, overall average standard score, and antagonist muscle balance status after training, along with targeted improvement suggestions. Automatic start / stop starts automatically when the arm is in contact with the top of the elbow pad and automatically stops when the arm leaves the elbow pad, requiring no manual operation throughout.

[0044] Example 2: The working process of the dual-function trainer in this embodiment is as follows: 1. Hardware parameters include a 12-bit absolute rotary encoder with an angle resolution of 0.088° and a sampling frequency of 50Hz; the eccentric disc has 5 adjustment holes 11: the lower 2 are for biceps (marked B1, B2), and the upper 3 are for triceps (marked T1, T2, T3); each hole is equipped with a mechanical contact switch; the control host pre-stores the nominal initial angle value for each setting, and the tension gauge provides full-range counterweight measurement; the elbow pads for the left and right forearms are 300mm long and [missing information - likely a measurement unit]. Two sets of conductive silicone electrodes are arranged along the axial direction of the forearm and elbow pad, each set consisting of two conductive silicone electrodes: the front set of conductive silicone electrodes is 50mm from the front end of the elbow pad, and the rear set of conductive silicone electrodes is 50mm from the rear end of the elbow pad. The conductive silicone electrodes are 30mm in diameter and are flush with the pad surface. The conductive silicone electrodes are connected to a 10kHz high-frequency impedance detection circuit, with a preset normal contact impedance range of 5kΩ~50kΩ. If the impedance exceeds the upper limit, it is determined that the arm has disengaged. If the impedance difference between the front and rear electrodes is greater than 20kΩ, it is determined that the forearm has slipped and shifted. The control host consists of a touch screen embedded in the main frame and an STM32 main control unit, which performs real-time calculation, evaluation, and result display of the acquired data. The operation process of the control host is as follows: 1. Same-mode training workflow (bilateral biceps training): In this scenario, the left and right arms are counted and evaluated independently, without triggering the antagonist muscle balance assessment unit; initial parameters are automatically acquired: after the user lowers the lever arm 9 to the B2 position, the latch locks: the mechanical contact switch of the B2 position is triggered, the control host automatically recognizes the training mode of the left side as biceps curl, and synchronously reads the current absolute angle of the encoder as 15.2°, calibrating it as the zero position (initial angle) of the left side movement, and presets the effective stroke threshold of this mode as 45°; in the same way, the right lever arm is adjusted to the B1 position, the control host recognizes the mode of the right side as biceps curl, and calibrates the zero position angle as 10.8°; the user inserts the counterweight latch into the 8th counterweight hole, and the counterweight is 40kg; Automatic standby activation of the control host: When the user sits on the seat cushion unit 1, with both forearms naturally resting on the forearm support pads, and the contact impedance of the front and rear conductive silicone electrodes on both sides falls within the range of 5kΩ~50kΩ, the main controller determines that the arms are in place, the evaluation system is automatically activated, and enters the standby counting state. Single movement evaluation (taking the left side as an example): The user completes one biceps curl upwards, the lever arm drives the encoder disc 10 to rotate clockwise, and the rotary encoder collects angle data in real time. Movement determination: The angle increases clockwise from the initial 15.2° to 62.7°, with a total rotation angle of 47.5°, which is greater than the 45° effective threshold, and is therefore considered a valid movement. Theoretical work calculation: The effective radius of the encoder disc winding is pre-calibrated to r=45mm, and the theoretical work done in a single movement is: ; Effectiveness correction: The electrode impedance remained stable between 12kΩ and 18kΩ throughout the entire movement, and the difference did not exceed the threshold. The effective coefficient k=1.0, and the effective training volume per session was 14.6J. Standard accuracy calculation: The centripetal phase duration is 1.2s, the coefficient of variation of angular acceleration is 0.12, and the rhythm compliance score is 92; the electrode impedance fluctuation difference is 3kΩ, and the posture compliance score is 95; the comprehensive action standard accuracy = 92×50% + 95×50% = 93.5 points, which is used to judge the action standard. Between-group results output: After each set of 12 repetitions, the control unit accumulates the total effective training volume of the left side as 175.2J with an average standard of performance of 91 points; and the total effective training volume of the right side as 128.7J with an average standard of performance of 88 points, which are displayed in real time on the touch screen.

[0045] The workflow for heteromodal antagonistic training (left biceps, right triceps) is as follows: In this scenario, the antagonistic muscle synergistic balance assessment is automatically activated. The pattern recognition and activation are as follows: The left side is adjusted to level B2 and identified as the biceps mode, with a zero position of 15.2°; the right side is adjusted to level T2 and identified as the triceps mode, with a zero position of 72.5°. The weight for both sides is 40kg. The control host detects the difference in training modes between the two sides and automatically switches to the antagonistic muscle synergistic balance assessment mode. The preset bilateral movement synchronization threshold is: starting time difference ≤ 150ms. Phase difference ≤ 10°; Synchronous movement validity verification: The user executes a bilateral synchronous supergroup (left arm curl concentric, right arm pressdown concentric synchronous force exertion): The force initiation time difference detected by the bilateral electrodes is 82ms, which is less than the 150ms threshold; the bilateral movement peak angle time difference is 95ms, which translates to a phase difference of 7.2°, which is less than the 10° threshold; This group is determined to be a synchronous and valid movement group and is included in the antagonistic balance assessment dataset; Antagonistic muscle force balance calculation: Combining the weight and the lever arm of the encoder, the bilateral peak output torque is calculated separately, as follows: Peak torque of the left biceps brachii: ; Peak torque of the right triceps brachii: ; Antagonistic muscle strength balance ratio: M1:M2 is 1:1; the measured ratio 1:1=1.0, which is lower than the lower limit of the interval 1.5, with a relative deviation of -33.33%. The absolute value of the deviation 33.33%>20%, which is judged as severe imbalance. Output and Interaction Module Output: Antagonistic Muscle Strength Balance Ratio 1.0:1; Balance Level: Severe Imbalance; Problem Identification: Triceps brachii muscle strength is significantly stronger than biceps brachii, the strength difference of the antagonistic muscle groups in the upper arm is too large, and long-term training may increase the risk of elbow joint strain; Training Suggestions: 1. Under the same weight training, increase the number of biceps brachii training sets or the range of motion of a single movement; 2. In subsequent training, increase the weight level of the left biceps brachii to reduce the muscle strength difference; 3. After training, focus on relaxing the triceps brachii to reduce static pressure on the joint.

[0046] Abnormal movement judgment: During a left bicep curl, the rotary encoder detected a momentary spike in the concentric phase angular acceleration with a coefficient of variation of 0.38, corresponding to a rhythm compliance score of 65; at the same time, the impedance difference between the front and rear electrodes increased to 28kΩ, indicating forearm slippage, with a posture compliance score of 60; the overall movement standard score was 62.5, marked as: non-standard movement, with swinging momentum and forearm slippage compensation. The effective work coefficient k for this exercise was taken as 0.7, and it was included in the total training volume after conversion.

[0047] The above embodiments are merely preferred embodiments of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present invention are included within the scope of the present invention.

Claims

1. A single-frame, insert-type, dual-function biceps and triceps trainer, characterized in that: include: The main frame has support sections that are bent backwards on both sides of the front end of the main frame. An insert-type counterweight unit is provided, which is located at the rear end of the main frame body. The insert-type counterweight unit includes a counterweight box, with door frames fixed on both sides of the counterweight box. A steel wire rope and a counterweight module are provided inside the counterweight box. The middle end of the steel wire rope is hooked to the lifting end at the top of the counterweight module, and both ends of the steel wire rope are led out of the counterweight box through a guide unit. A seat cushion unit, which is fixed to the middle of the front end of the main frame; An elbow pad unit, comprising corner seats fixed to both sides within a support section, a pad fixed between the corner seats, and an elbow pad body fixed to the top surface of the pad. The training execution unit includes a boom body and an eccentric disc. Multiple adjustment holes are spaced circumferentially around the inner edge of the eccentric disc. An arc-shaped groove is integrally formed on the outer edge of the eccentric disc. The upper part of the boom body and the center of the eccentric disc are hinged between a support section and a corner seat via a pin. Swing plates are hinged to both sides of the eccentric disc via the pin, and guide wheels are rotatably mounted on the outer circumference of the eccentric disc via the swing plates. A pull column is vertically fixed to the inner lower part of the boom body, and a handle is fixed to the pull column. A first elastic pin is fixed to the upper part of the boom body, movably engaging with the adjustment holes. Multiple outer transition wheels are rotatably mounted along the inner edge of the main frame. The wire rope, after being led out from the counterweight box, passes sequentially through the outer transition wheels and guide wheels, and is fixed to the arc-shaped groove. A check pin is fixed on the support section, abutting against the swing plates. A thrust stop pin is fixed on the eccentric disc, abutting against the swing plates.

2. The single-frame insert-type dual-function biceps and triceps trainer according to claim 1, characterized in that: The bottom of the main frame is fixed with foot covers.

3. The single-frame insert-type dual-function biceps and triceps trainer according to claim 1, characterized in that: The guiding unit includes a lower wheel seat fixed to the top lifting end of the counterweight module, on which a lifting wheel is rotatably mounted; multiple upper wheel seats are fixed side by side on both sides of the lower wheel seat at the top inner side of the counterweight box, on which an inner transition wheel is rotatably mounted; and guide wheels are rotatably mounted on the middle of both sides of the counterweight box via wheel seats; a steel wire rope is sleeved on the lifting wheel, and both ends of the steel wire rope are led out of the counterweight box through the inner transition wheel and the guide wheel in sequence.

4. The single-frame insert-type dual-function biceps and triceps trainer according to claim 1, characterized in that: The main frame includes two horizontal side beams. The rear end of the horizontal side beams is fixed to the door frame. The front end of the horizontal side beams is fixed to a corner structure upright beam. The support section is integrally formed on the top of the upright beam. A middle beam is provided at the bottom between the upright beams. The front end of the middle beam is fixed to the counterweight box. A connecting rod is fixed between the middle beam and the upright beam. The outer transition wheel is rotatably disposed inside the horizontal side beam.

5. The single-frame insert-type dual-function biceps and triceps trainer according to claim 1, characterized in that: The seat cushion unit includes a support leg fixed to the rear end of the central beam, with a square tube positioned directly opposite the front end of the support leg; upper and lower connecting plates are hinged to both sides of the support leg and the square tube; an adjustment plate is fixed to the side of the support leg near the square tube, and the adjustment plate has multiple adjustment holes spaced apart along an arc direction; a lower edge is integrally formed in the middle of the bottom surface of one of the upper connecting plates, and a second elastic pin is fixed on the lower edge to movably engage with the adjustment holes; a cylinder or damper is hinged between the lower part of the support leg and the upper part of the square tube; and a seat cushion is fixed to the top of the square tube.

6. The single-frame insert-type dual-function biceps and triceps trainer according to claim 1, characterized in that: An adjustment handle is vertically fixed to the outer side of the lower part of the boom body.

7. The single-frame insert-type dual-function biceps and triceps trainer according to claim 3, characterized in that: A rotary encoder is installed between the center of the enamel disc and the corner seat. The rotary encoder is fixed to the corner seat, and the pin shaft moves through the rotary encoder. A tension gauge is installed between the lower wheel seat and the top lifting end of the counterweight module. A proximity switch is installed on the back of the enamel disc at each adjustment hole. The rotary encoder, tension gauge, and proximity switch are connected to the control host. The control host has a built-in training result evaluation unit.

8. The single-frame insert-type dual-function biceps and triceps trainer according to claim 7, characterized in that: The elbow pad has conductive silicone electrodes on both sides of its top surface, at the front and rear ends respectively; the conductive silicone electrodes are connected to the control host.

9. The single-frame insert-type dual-function biceps and triceps trainer according to claim 7, characterized in that: The training result evaluation unit includes an evaluation calculation unit, which is connected to the effective training volume calculation unit, the movement standard evaluation unit, and the antagonistic muscle balance evaluation unit; the evaluation calculation unit is also connected to an output and interaction module.

10. The single-frame insert-type dual-function biceps and triceps trainer according to claim 9, characterized in that: During the assessment by the antagonistic muscle balance assessment unit, the two sets of boom bodies are set to biceps brachii mode and triceps brachii mode respectively, and the bilateral conductive silicone electrodes are simultaneously in place.

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