An adjustable bracket for backpack use

Abstract

The present invention discloses an adjustable carrying bracket in the field of human body load technology, aiming to solve the technical problem in the prior art that the suspension backpack cannot optimize and adjust the shock absorption system according to the weight and the walking condition of the wearer. The bracket includes a fixed frame for carrying on the human body and a sliding module for fixing the load backpack, and the sliding module is slidably connected with the fixed frame in the vertical direction; the fixed frame is provided with a central controller, an acceleration sensor for collecting the walking frequency of the human body, a pressure-sensitive sensor for collecting the weight of the load backpack, and a driving module for driving the sliding module to move in the vertical direction, and the central controller is electrically connected to the acceleration sensor, the pressure-sensitive sensor, and the driving module respectively; the driving module includes an elastic rope connected to the sliding module, and the driving module is transmission-connected to the sliding module through the elastic rope.

Description

Technical Field

[0001] The invention relates to an adjustable support for carrying, belonging to the technical field of human body load. Background Art

[0002] When doing outdoor sports, military operations, and rescue operations, people usually need to carry heavy loads to exercise. The impact force generated by the vibration of a heavy-load backpack can easily make people feel tired and even endanger human health. In order to solve the problem of excessive load on traditional backpacks causing harm to the human body, the backpack structure needs to be modified. When a person walks, since the vertical movement of the human torso is approximately a sine curve, when the load moves downward, it will have a great impact on the human shoulder. Therefore, the vertical displacement amplitude of the backpack should be reduced, which can not only reduce the impact force on the human shoulder, but also reduce the energy consumption during walking, reduce the burden on the carrier, and the carrier can bear a larger weight under the same metabolic consumption, and reduce the force on the joints and avoid muscle damage. To this end, technicians have developed a suspension backpack. However, the current suspension backpack mainly adopts a spring damping structure, and it is impossible to optimize and adjust the shock absorption system according to the weight and the walking conditions of the carrier. Summary of the invention

[0003] In view of the deficiencies of the prior art, the purpose of the present invention is to provide an adjustable carrying bracket to solve the technical problem that the floating backpack in the prior art cannot optimize and adjust the shock absorption system according to the weight of the object and the walking conditions of the wearer.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] An adjustable support for carrying, comprising a fixing frame for carrying on a human body and a sliding module for fixing a load backpack, wherein the sliding module is slidably connected to the fixing frame in a vertical direction;

[0006] The fixing frame is provided with a central controller, an acceleration sensor for collecting human walking frequency, a pressure-sensitive sensor for collecting the weight of the load backpack, and a driving module for driving the sliding module to move in a vertical direction. The central controller is electrically connected to the acceleration sensor, the pressure-sensitive sensor, and the driving module respectively;

[0007] The driving module comprises an elastic rope connected to the sliding module, and the driving module is transmission-connected to the sliding module via the elastic rope.

[0008] Furthermore, the driving module further comprises a driving source disposed on the fixing frame, and the driving module is electrically connected to the central controller via the driving source;

[0009] The power output end of the driving source is drivingly connected to a lead screw in the vertical axial direction. The lead screw is threadedly connected to a slider, and the slider is fixedly connected to an elastic rope.

[0010] Further, a fixed pulley is rotatably connected to the fixing frame. The elastic rope fixedly connected to the slider passes around the fixed pulley and is fixedly connected to the sliding module. The pressure-sensitive sensor is pressed between the fixed pulley and the fixing frame.

[0011] Further, the fixing frame is further connected to a guide rod in the vertical axial direction. The guide rod passes through the slider and is slidably connected thereto.

[0012] Further, the driving source includes a stepper motor.

[0013] Further, there are at least two fixing frames distributed in the vertical direction. The fixing frames are fixedly connected by a guide rail in the vertical axial direction. The sliding module is slidably connected to the fixing frame through the guide rail.

[0014] Further, the central controller, the acceleration sensor, the pressure-sensitive sensor, and the driving source are centrally deployed on one of the fixing frames.

[0015] Further, there are two guide rails symmetrically distributed in the horizontal direction.

[0016] Further, the fixing frame is further connected to a power supply electrically connected to the central controller.

[0017] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: The bracket of the present invention uses a pressure-sensitive sensor to obtain the weight of the load backpack, and uses an acceleration sensor to obtain the human walking frequency in real time. The resonance stiffness of the bracket is calculated based on the human walking frequency and the weight of the load backpack. The effective length of the elastic rope is adjusted in time by a stepper motor, so that the stiffness of the elastic rope is always maintained at half of the resonance stiffness of the bracket. In this state, the impact of the load backpack on the human body is minimized, which is more conducive to reducing the stress on human joints and avoiding muscle damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of an embodiment of the bracket of the present invention;

[0019] Figure 2 is a schematic diagram of the installation position of the pressure-sensitive sensor in the embodiment of the bracket of the present invention;

[0020] Figure 3 is a schematic principle diagram of an embodiment of the method of the present invention;

[0021] Figure 4 is a schematic flow diagram of an embodiment of the method of the present invention.

[0022] In the figure: 1, fixed bracket; 2, guide rail; 3, sliding module; 4, lead screw; 5, elastic rope; 6, stepper motor; 7, fixed pulley; 8, central controller; 9, acceleration sensor; 10, power supply; 11, slider; 12, guide rod; 13, pressure-sensitive sensor. Specific implementation mode

[0023] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0024] It should be noted that in the description of the present invention, the orientation or positional relationship indicated by the terms "front", "rear", "left", "right", "up", "down", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and does not require the present invention to be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to the present invention. The terms "front", "rear", "left", "right", "up", "down" used in the description of the present invention refer to the directions in the accompanying drawings, and the terms "inner" and "outer" respectively refer to the directions towards or away from the geometric center of a specific component.

[0025] The specific implementation mode of the present invention provides an adjustable bracket for carrying on the back, as Figure 1 shown, which is a schematic structural diagram of an embodiment of the bracket of the present invention, including a fixed bracket 1, a guide rail 2, a sliding module 3, a lead screw 4, an elastic rope 5, a stepper motor 6, a fixed pulley 7, a central controller 8, an acceleration sensor 9, a power supply 10, a slider 11, and a guide rod 12. In this embodiment, there are three fixed brackets 1, each fixed bracket 1 is placed horizontally, and the three fixed brackets 1 are distributed along the vertical direction.

[0026] There are two guide rails 2, and the two guide rails 2 are symmetrically distributed left and right. The upper ends of the two guide rails 2 are fixedly connected to the fixed bracket 1 at the upper position, the lower ends of the two guide rails 2 are fixedly connected to the fixed bracket 1 at the lower position, and the middle upper position of the two guide rails 2 is fixedly connected to the fixed bracket 1 at the middle position. The three fixed brackets 1 and the two guide rails 2 together form a rectangular frame, and this rectangular frame is carried on the human body. The sliding module 3 is used to fix the load backpack, is slidably connected to the two guide rails 2, and can slide up and down along the guide rails 2.

[0027] The stepper motor 6, the central controller 8, the acceleration sensor 9, and the power supply 10 are all fixed on the fixed bracket 1 at the middle position. The fixed bracket 1 at the middle position is provided with a through groove along the vertical direction. A fixed pulley 7 is arranged in this through groove, and the fixed pulley 7 is rotatably connected to the fixed bracket 1 at the middle position through a bearing. A pressure-sensitive sensor 13 is arranged between the fixed bracket 1 at the middle position and the bearing. The pressure-sensitive sensor 13 is arranged below the bearing and is used to sense the weight borne by the fixed pulley 7 in the vertical direction, specifically as Figure 2As shown, it is a schematic diagram of the installation position of the pressure - sensitive sensor in the stent embodiment of the present invention. The stepper motor 6, the pressure - sensitive sensor 13, the acceleration sensor 9, and the power supply 10 are electrically connected to the central controller 8 respectively.

[0028] The guide rod 12 is fixedly connected vertically between the fixed frame 1 at the middle position and the fixed frame 1 at the lower position. The lead screw 4 is connected vertically between the stepper motor 6 and the fixed frame 1 at the lower position. The rotating shaft of the stepper motor 6 is connected to the upper end of the lead screw 4, and the lower end of the lead screw 4 is rotatably connected to the fixed frame 1 at the lower position. The stepper motor 6 can drive the lead screw 4 to rotate around its axis. The slider 11 is threadedly connected to the lead screw 4. When the lead screw 4 rotates, it drives the slider 11 to move up and down linearly along the axis of the lead screw 4. A through - hole is provided vertically on the slider 11, and the guide rod 12 passes through the through - hole and is slidably connected to the slider 11, playing a role in guiding in the vertical direction and preventing the slider 11 from rotating. One end of the elastic rope 5 is fixedly connected to the slider 11, and the other end of the elastic rope 5 is wound around the fixed pulley 7 and fixedly connected to the sliding module 3. The top surface of the fixed pulley 7 contacts the elastic rope 5. When the slider 11 moves up and down linearly, it can drive the sliding module 3 to move up and down linearly in the vertical direction through the elastic rope 5. The sliding module 3 fixed with the load backpack exerts its weight on the fixed pulley 7 through the elastic rope 5, and then the pressure - sensitive sensor 13 located below the bearing of the fixed pulley 7 can sense the weight of the load backpack.

[0029] The specific embodiment of the present invention also provides a control method for the adjustable stent for carrying, which is used to control the aforementioned invention stent, as Figure 3 As shown, it is a schematic diagram of the principle of the method embodiment of the present invention, including the following steps:

[0030] Step 1, the central controller 8 analyzes and obtains the human walking frequency through the acceleration sensor 9;

[0031] Step 2, the central controller 8 calculates and obtains the weight of the load backpack borne by the sliding module 3 through the pressure - sensitive sensor 13;

[0032] Step 3, the central controller 8 drives the module 3 to move up and down linearly through the stepper motor 6 according to the obtained human walking frequency and the weight of the load backpack, thereby changing the effective length of the elastic rope 5. The effective length of the elastic rope 5 is the length between the contact point of the elastic rope 5 and the fixed pulley 7 and the connection point of the elastic rope 5 and the sliding module 3. By changing the effective length of the elastic rope 5, the stiffness of the elastic rope 5 is adjusted so that the stiffness of the elastic rope 5 is half of the resonance stiffness of the stent of the present invention.

[0033] The specific analysis is as follows:

[0034] The bracket of the present invention is a spring - mass - damping system. When the stiffness of the elastic rope 5 is half of the resonance stiffness of the bracket of the present invention, the dynamic load of the backpack is minimized. In this state, the impact of the loaded backpack on the human body is minimized. The stiffness of the bracket of the present invention is determined by the weight of the loaded backpack and the walking frequency of the human body. The formula for its resonance stiffness is:

[0035] k1 = mw 2 ,

[0036] In the formula, k1 is the resonance stiffness of the bracket of the present invention, m is the weight of the loaded backpack, and w is the walking frequency of the human body;

[0037] The pressure - sensitive sensor 13 and the acceleration sensor 9 transmit the collected data to the central controller 8. The central controller 8 calculates the resonance stiffness k1 of the bracket of the present invention according to the collected data, and makes the stiffness of the elastic rope 5

[0038] The calculation formula for the stiffness of the elastic rope 5 is:

[0039]

[0040] In the formula, k2 is the stiffness of the elastic rope, E is the elastic modulus of the elastic rope, S is the cross - sectional area of the elastic rope, and L is the effective length of the elastic rope.

[0041] In summary, the formula for the optimal rope length of the elastic rope can be obtained:

[0042]

[0043] Since both the elastic modulus E and the cross - sectional area S of the elastic rope are constants, the central controller 8 can calculate the optimal rope length of the elastic rope 5 according to the weight m of the loaded backpack and the walking frequency w of the human body, and change the effective length of the elastic rope 5 by adjusting the stepping motor 6, finally making the stiffness of the elastic rope 5 half of the resonance stiffness of the bracket of the present invention.

[0044] As Figure 4 shown, it is a schematic flow chart of the method embodiment of the present invention, that is, the program in the central controller 8 executes according to the process in Figure 4 . After the central controller 8 is started, first, it reads the measured value of the pressure - sensitive sensor 13 and calculates the weight m of the loaded backpack; then, it reads the measured value of the acceleration sensor 9 in real time and calculates the walking frequency w of the human body; subsequently, the central controller 8 calculates the optimal rope length L of the elastic rope 5 in real time based on m and w according to the foregoing formula for the optimal rope length; then, the central controller 8 timely adjusts the stepping motor 6 to make the effective rope length of the elastic rope 5 always the optimal rope length L, thereby timely changing the stiffness of the elastic rope 5.

[0045] More specifically, the central controller 8 reads the measured values of the acceleration sensor 9 at preset time intervals, calculates the human walking frequency w, and determines whether it is necessary to readjust the effective rope length of the elastic rope 5 according to the latest obtained human walking frequency w1. The condition for readjustment is: |w - w1| / w > C, where |w - w1| / w represents the degree of change in the human walking frequency, and C is a constant. In this embodiment, the value range of C is [0, 0.5]. By adjusting the value range of C, the sensitivity of the rope length adjustment of the elastic rope 5 can be changed.

[0046] When this judgment condition is "true", it indicates that the human walking frequency has changed significantly and the effective length of the elastic rope 5 needs to be readjusted. Then the central controller 8 readjusts the stepping motor 6 to adjust the stiffness of the elastic rope 5. When this judgment condition is "false", it indicates that the human walking frequency has no change or very little change, and there is no need to readjust the effective length of the elastic rope 5. Then the central controller 8 does not adjust the stepping motor 6 to adjust the stiffness of the elastic rope 5. The central controller 8 continuously judges this condition to determine whether it is necessary to adjust the stepping motor 6, realizing the adaptive adjustment of the bracket of the present invention.

[0047] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and deformations can still be made, and these improvements and deformations should also be regarded as the protection scope of the present invention.

Claims

1. An adjustable bracket for carrying on the back, characterized in that, It comprises a fixing frame (1) for being carried on a human body and a sliding module (3) for fixing a load backpack, wherein the sliding module (3) is slidably connected to the fixing frame (1) in a vertical direction; The fixing frame (1) is provided with a central controller (8), an acceleration sensor (9) for collecting the walking frequency of a human body, a pressure-sensitive sensor (13) for collecting the weight of a load backpack, and a driving module for driving the sliding module (3) to move in a vertical direction, and the central controller (8) is electrically connected to the acceleration sensor (9), the pressure-sensitive sensor (13), and the driving module respectively; The driving module comprises: a driving source, and an elastic rope (5) connected to the sliding module (3); the driving module is drivingly connected to the sliding module (3) via the elastic rope (5); the power output end of the driving source is drivingly connected to a vertically axial screw rod (4), the screw rod (4) is threadedly connected to a slider (11), and the slider (11) is fixedly connected to the elastic rope (5); the fixed frame (1) is rotatably connected to a fixed pulley (7), and the elastic rope (5) is fixedly connected to the sliding module (3) via the fixed pulley (7); In the working state, the elastic rope stiffness is taken as half of the resonance stiffness of the bracket as the adjustment target, and the central controller (8) calculates the optimal rope length of the elastic rope corresponding to the adjustment target according to the acquired weight of the load bag and the walking frequency of the human body, and then controls the driving source based on the optimal rope length to drive the sliding module (3) to move up and down linearly, thereby completing the elastic rope stiffness adjustment within the current preset time interval; the optimal rope length is the length between the contact point between the elastic rope (5) and the fixed pulley (7) to the connection point between the elastic rope (5) and the sliding module (3); When the next preset time interval is performed, it is determined whether the optimal rope length needs to be recalculated according to the preset human walking frequency judgment rule. If so, it is recalculated; otherwise, the optimal rope length remains unchanged.

2. The adjustable bracket for carrying according to claim 1, characterized in that, The driving source is arranged on the fixing frame (1), and the driving module is electrically connected to the central controller (8) via the driving source.

3. The adjustable support for carrying on the back according to claim 1, characterized in that, The pressure-sensitive sensor (13) is pressed between the fixed pulley (7) and the fixed frame (1).

4. The adjustable support for carrying on the back according to claim 1, characterized in that, The fixing frame (1) is also connected to a vertical axial guide rod (12), and the guide rod (12) passes through the sliding block (11) and is slidably connected thereto.

5. The adjustable support for carrying on the back according to claim 1, characterized in that, The driving source comprises a stepping motor (6).

6. The adjustable support for carrying according to claim 1, characterized in that, The fixing frames (1) are provided with no less than two and are distributed in the vertical direction. The fixing frames (1) are fixedly connected via a vertical axial guide rail (2), and the sliding module (3) is slidably connected to the fixing frames (1) via the guide rail (2).

7. The adjustable support for carrying on the back according to claim 1, characterized in that, The central controller (8), the acceleration sensor (9), the pressure-sensitive sensor (13), and the driving source are centrally arranged on one of the fixed frames (1).

8. The adjustable bracket for carrying on the back according to claim 6, characterized in that, The guide rails (2) are provided with two and are symmetrically distributed in the horizontal direction.

9. The adjustable support for carrying on the back according to claim 1, characterized in that, The fixing frame (1) is also connected to a power source (10) which is electrically connected to the central controller (8).

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