An adjustable stiffness load-lifting suspension backpack and method of use

Abstract

The application discloses a load-reducing suspension backpack with adjustable rigidity and a use method, and relates to the technical field of suspension backpacks. The application comprises a back plate and a moving load plate, a guide mechanism is installed between the back plate and the moving load plate, and is used for enabling relative movement between the back plate and the load plate in the vertical direction; a spring fixing block is fixedly connected to one side of the back plate facing the moving load plate, and a compression spring is fixedly connected to the top of the spring fixing block. The steel plate spring and the compression spring are combined, the structure is compact, the out-of-phase movement between the backpack and the human body can be maintained, the dynamic oscillation force of the man-machine system on the legs is reduced, and through the cooperation of the deformable rhombic mechanism and the adjusting mechanism, the stress point on the steel plate spring can be changed, the cantilever beam length of the vibration of the steel plate spring is changed, the rigidity adjustment of the whole device is realized, the device is convenient to adapt to the situation of carrying different weights of articles, and the practicality of the device is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of suspension backpacks, in particular to a load-reducing suspension backpack with adjustable rigidity and a use method thereof. BACKGROUND

[0002] As the most common way for humans to carry loads, backpacks have the advantages of convenience and speed, but long-term load carrying can cause muscle fatigue and shoulder and leg pain. The traditional backpack load is fixed to the upper body, and the force acting on the human body cannot be changed, so the human body needs to consume additional energy to balance the load of the backpack. The suspension backpack decouples the load of the backpack from the human body movement through a suspension system, changes the force acting on the human body from a static force to a dynamic force, and thus changes the influence on the human muscles and bones.

[0003] The suspension system can be controlled by a motor, but the adjustment of the motor will increase the weight of the backpack. Another way is to use a single degree of freedom vibration system composed of a spring and a damper to realize the forced vibration of the backpack load. However, the rigidity of the single spring and damper system limits the weight of the backpack load, and the rigidity of the spring and damper system needs to be changed by replacing the spring, which is not convenient to operate and has poor practicality. Therefore, the present application provides a load-reducing suspension backpack with adjustable rigidity and a use method thereof. SUMMARY

[0004] The present application aims to provide a load-reducing suspension backpack with adjustable rigidity and a use method thereof, which can reduce the impact of system dynamic oscillation force on the human body, has good load reduction effect, and can quickly adjust the rigidity, thus having stronger practicality.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a load-reducing suspension backpack with adjustable rigidity, comprising a back plate and a moving load plate, a guide mechanism is installed between the back plate and the moving load plate for enabling the back plate and the moving load plate to move relative to each other in the vertical direction;

[0006] A spring fixing block is fixedly connected to one side of the back plate facing the moving load plate, a compression spring is fixedly connected to the top of the spring fixing block, a steel plate spring is fixedly connected to the top end of the compression spring, and the compression spring is located in the middle of the steel plate spring;

[0007] A linear guide rail is fixedly connected to one side of the moving load plate facing the back plate, the linear guide rail is perpendicular to the steel plate spring, a deformable rhombus mechanism is slidably connected to the linear guide rail, the deformable rhombus mechanism has four vertices, two vertices in the vertical direction are slidably connected to the linear guide rail, and two vertices in the horizontal direction are slidably connected to the steel plate spring;

[0008] The side wall of the mobile load plate is fixedly provided with an adjusting mechanism for adjusting the distance between two vertical vertexes of the deformable rhombus mechanism.

[0009] Further, the back plate and the mobile load plate are slidably connected through a guide mechanism, the guide mechanism comprising a slide rail fixedly connected to the side wall of the back plate and a trolley fixedly mounted on the mobile load plate, and the side wall of the slide rail is provided with a sliding groove matched with the trolley.

[0010] Further, the number of the slide rails is two, and the two slide rails are symmetrically mounted on the back plate, and each slide rail is slidably connected with two trolleys.

[0011] Further, the side of the back plate away from the mobile load plate is fixedly provided with a back strap, and the side of the mobile load plate away from the back plate is fixedly provided with a load bag.

[0012] Further, the linear guide rail is fixedly provided on the mobile load plate through bolts in the vertical direction, and the top end of the linear guide rail is fixedly connected with a stopper.

[0013] Further, the deformable rhombus mechanism comprises eight connecting rods and four connecting pieces, the four connecting pieces are located at the four vertexes of the rhombus, and every two connecting rods of the eight connecting rods form a group, and the four groups of connecting rods are rotationally connected to the four connecting pieces as the four sides of the rhombus.

[0014] Further, the four connecting pieces comprise two vertical connecting pieces and two horizontal connecting pieces, the two vertical connecting pieces are slidably connected to the two ends of the linear guide rail, and the two horizontal connecting pieces are slidably connected to the two ends of the steel plate spring.

[0015] Further, the adjusting mechanism comprises two mounting seats fixedly connected to the side wall of the mobile load plate, the two mounting seats are rotationally connected with a threaded rod, the mounting seat located at the upper side is fixedly connected with the bottom end of the linear guide rail through bolts, the bottom end of the threaded rod penetrates through the mounting seat located at the lower side, and the bottom end of the threaded rod is fixedly connected with a knob.

[0016] Further, the side wall of one of the two vertical connecting pieces of the deformable rhombus mechanism close to the threaded rod is fixedly connected with an adjusting sliding block, and the bottom of the adjusting sliding block is threadedly connected with the threaded rod.

[0017] The inside of the adjusting sliding block is slidably connected with two guide rods, and the two guide rods are fixedly connected between the two mounting seats in the adjusting mechanism.

[0018] According to the second aspect of the present application, the present application provides a use method of the load-reducing suspension back pack with adjustable rigidity, comprising the following steps:

[0019] S1. First, load the load bag with the items, then the user carries the load suspension backpack and walks, when the vertical acceleration of the center of mass of the human body changes constantly, the backboard of the load suspension backpack follows the motion of the center of mass of the human body, at this time the steel plate spring bends and deforms, the compression spring compresses and deforms, the load moving plate drives the load bag to vibrate up and down on the backboard, and generates opposite phase motion opposite to the vertical acceleration of the center of mass of the human body, so as to realize the load reduction function;

[0020] S2. When the overall rigidity of the device needs to be reduced, the knob is rotated in the forward direction to drive the threaded rod to rotate on the two mounting seats, which can drive the adjusting slider to move upwards, when the adjusting slider moves upwards, the two vertical connecting pieces of the deformable diamond mechanism simultaneously move towards the center, and the two horizontal connecting pieces simultaneously move away from the center position, at this time the concentrated stress point on the steel plate spring moves away from the middle part, and the overall rigidity of the device is reduced;

[0021] S3. When the overall rigidity of the device needs to be increased, the knob is rotated in the reverse direction to drive the threaded rod to rotate, thereby driving the adjusting slider to move downwards, at this time the two vertical connecting pieces of the deformable diamond mechanism simultaneously move away from the center, and the two horizontal connecting pieces simultaneously move towards the center position, at this time the concentrated stress point on the steel plate spring moves towards the middle part, and the overall rigidity of the device is increased.

[0022] The present application has at least the following advantages:

[0023] 1. The steel plate spring and the compression spring are combined in the present application, the structure is compact, and the whole is passive, which can maintain the opposite phase motion between the backpack and the human body in various step frequencies in daily motion, thereby reducing the dynamic oscillation force of the man-machine system on the legs, so that the user is not easy to feel tired in the walking process.

[0024] 2. The present application can change the stress point on the steel plate spring through the cooperation of the deformable diamond mechanism and the adjusting mechanism, thereby changing the cantilever beam length of the vibration of the steel plate spring, realizing the rigidity adjustment of the whole device, and facilitating the adaptation to the situation of carrying different weights of objects, and improving the practicality of the device.

[0025] 3. In the present application, the moving load plate is located in the upper middle part of the backboard under the condition of no load. After adding the load, the moving load plate moves downwards. Lifting the load plate in the initial unloaded state helps the load moving plate not to descend to the waist of the human body after loading, thereby affecting the experience of the user.

[0026] Of course, any product implementing the present application does not necessarily need to achieve all the advantages described above. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1Fig. 1 is a perspective view of the first view of the overall structure of the present application;

[0028] Figure 2 Fig. 2 is a perspective view of the second view of the overall structure of the present application;

[0029] Figure 3 Fig. 3 is a front view of the deformable diamond mechanism structure of the present application;

[0030] Figure 4 Fig. 4 is a perspective view of the deformable diamond mechanism structure of the present application;

[0031] Figure 5 Fig. 5 is a perspective view of the leaf spring structure of the present application;

[0032] Figure 6 Fig. 6 is a schematic diagram of the stiffness equivalence principle of the leaf spring and compression spring of the present application;

[0033] Figure 7 Fig. 7 is a schematic diagram of the structure of the present application for reducing the overall stiffness of the device;

[0034] Figure 8 Fig. 8 is a schematic diagram of the structure of the present application for increasing the overall stiffness of the device.

[0035] Reference signs:

[0036] 1, back plate; 2, moving load plate; 3, guide mechanism; 31, slide rail; 32, trolley; 4, spring fixing block; 5, compression spring; 6, leaf spring; 7, linear guide rail; 8, deformable diamond mechanism; 81, connecting rod; 82, connecting piece; 83, upper support point; 84, lower support point; 85, left support point; 86, right support point; 9, adjusting mechanism; 91, mounting seat; 92, threaded rod; 93, knob; 94, adjusting sliding block; 10, back strap; 11, load bag. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present disclosure will be described clearly and completely below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present disclosure.

[0038] Because the center of mass of the human body moves in a sinusoidal curve during walking, the sinusoidal motion of the center of mass in the vertical direction exerts an oscillating force on the ground reaction force borne by the lower limbs and feet of the human body. For a common backpack, the load is fixedly connected to the human body, and the motion of the system center of mass of the load and the human body does not change in the vertical direction. Therefore, the presence of the load increases the amplitude of the oscillating force of the ground reaction force borne by the lower limbs and feet of the human body, causing additional burden on the muscles of the human body and consuming additional energy. However, by using the load-reducing suspension backpack, the load and the human body are decoupled, the center of mass of the load moves out of phase with the center of mass of the human body, and thus the amplitude of the system center of mass of the load and the human body is reduced in the vertical direction. Compared with the amplitude of the system oscillating force generated by the common backpack, the amplitude of the system oscillating force generated by the load-reducing suspension backpack is reduced, which relieves the energy consumption of the muscles of the human body and thus relieves the fatigue during walking, thereby achieving the function of load reduction.

[0039] Embodiment one:

[0040] Please refer to Figure 1 and Figure 2 The present application provides a technical solution: a load-reducing suspension backpack with adjustable stiffness, comprising a back plate 1 and a moving load plate 2, a guide mechanism 3 is installed between the back plate 1 and the moving load plate 2 for enabling relative movement between the back plate 1 and the load plate in the vertical direction.

[0041] The side of the back plate 1 facing the moving load plate 2 is fixedly connected with a spring fixing block 4, the top of the spring fixing block 4 is fixedly connected with a compression spring 5, the top end of the compression spring 5 is fixedly connected with a steel plate spring 6, and the compression spring 5 is located in the middle of the steel plate spring 6.

[0042] The side of the moving load plate 2 facing the back plate 1 is fixedly connected with a linear guide rail 7, the linear guide rail 7 is perpendicular to the steel plate spring 6, and the linear guide rail 7 is slidingly connected with a deformable rhombus mechanism 8, the deformable rhombus mechanism 8 has four vertices, two vertices in the vertical direction are slidingly connected to the linear guide rail 7, and two vertices in the horizontal direction are slidingly connected to the steel plate spring 6.

[0043] An adjusting mechanism 9 is fixedly installed on the side wall of the moving load plate 2 for adjusting the distance between the two vertices in the vertical direction of the deformable rhombus mechanism 8.

[0044] For the technical solution of this embodiment, the back plate 1 and the moving load plate 2 are made of carbon fiber material, the back plate 1 and the moving load plate 2 are slidingly connected through the guide mechanism 3, the guide mechanism 3 includes a sliding rail 31 fixedly connected to the side wall of the back plate 1 and a trolley 32 fixedly installed on the moving load plate 2, and a sliding groove adapted to the trolley 32 is formed in the side wall of the sliding rail 31.

[0045] Further, the mobile load plate 2 is located at the middle upper part of the back plate 1 without applying load, and after adding load, the mobile load plate 2 moves downward, and the lifting of the load plate in the initial state without loading the weight helps the load plate not to descend to the waist of the human body after loading, thereby affecting the experience of the user.

[0046] Further, the number of the slide rails 31 is two, the two slide rails 31 are symmetrically installed on the back plate 1, and two trolleys 32 are slidably connected to each slide rail 31, and the use of the four trolleys 32 ensures the vertical up-down movement of the mobile load plate 2, the trolleys 32 reciprocate up and down in the sliding grooves of the slide rails 31, and the sliding grooves and the trolleys 32 are limited to each other, so that the trolleys 32 do not fall out of the sliding grooves during the up-down movement of the mobile load plate 2, thereby facilitating the enhancement of stability.

[0047] According to the technical scheme of the embodiment, the back plate 1 is fixedly installed with a back strap 10 away from the mobile load plate 2, and the mobile load plate 2 is fixedly installed with a load bag 11 away from the back plate 1, a plurality of square grooves are formed in the four corner sidewalls of the mobile load plate 2, and the load bag 11 is fixed by being threaded on the square grooves through a rope.

[0048] According to the technical scheme of the embodiment, the spring fixing block 4, the compression spring 5 and the steel plate spring 6 arranged in the middle of the back plate 1 form a double-spring series connection mechanism, and the decoupling movement of the human body and the load during use is completed by the bending deformation of the steel plate spring 6 and the compression deformation of the compression spring 5.

[0049] According to the technical scheme of the embodiment, as shown in Figure 3 The deformable diamond mechanism 8 is made of carbon fiber material, the deformable diamond mechanism 8 includes eight connecting rods 81 and four connecting pieces 82, the four connecting pieces 82 are located at the four vertices of the diamond, and are respectively an upper support point 83, a lower support point 84, a left support point 85 and a right support point 86, every two connecting rods 81 in the eight connecting rods 81 form a group, and the four groups of connecting rods 81 are rotationally connected to the four connecting pieces 82 as four sides of the diamond;

[0050] As shown in Figure 4 The four connecting pieces 82 include two vertical connecting pieces 82 and two horizontal connecting pieces 82, the two vertical connecting pieces 82 are slidably connected to the two ends of the linear guide rail 7, and the two horizontal connecting pieces 82 are slidably connected to the two ends of the steel plate spring 6, the two sides of the steel plate spring 6 are cantilever beams, the positions of the two horizontal connecting pieces 82 are different, the stress points of the cantilever beams are different, the bending deformation degrees are different, and the amplitudes of forced vibration in the movement process are different.

[0051] According to the technical scheme of the embodiment, as shown in Figure 3 and Figure 4As shown, the adjusting mechanism 9 includes two mounting seats 91 fixedly connected to the side walls of the movable load plate 2, a threaded rod 92 rotatably connected between the two mounting seats 91, the upper mounting seat 91 is fixedly connected to the bottom end of the linear guide rail 7 by bolts, and the bottom end of the threaded rod 92 penetrates the lower mounting seat 91 and is fixedly connected with a knob 93;

[0052] As shown, the adjusting mechanism 9 includes two mounting seats 91 fixedly connected to the side walls of the movable load plate 2, a threaded rod 92 rotatably connected between the two mounting seats 91, the upper mounting seat 91 is fixedly connected to the bottom end of the linear guide rail 7 by bolts, and the bottom end of the threaded rod 92 penetrates the lower mounting seat 91 and is fixedly connected with a knob 93; Figure 7 As shown, the adjusting mechanism 9 includes two mounting seats 91 fixedly connected to the side walls of the movable load plate 2, a threaded rod 92 rotatably connected between the two mounting seats 91, the upper mounting seat 91 is fixedly connected to the bottom end of the linear guide rail 7 by bolts, and the bottom end of the threaded rod 92 penetrates the lower mounting seat 91 and is fixedly connected with a knob 93; Figure 8 As shown, the adjusting mechanism 9 includes two mounting seats 91 fixedly connected to the side walls of the movable load plate 2, a threaded rod 92 rotatably connected between the two mounting seats 91, the upper mounting seat 91 is fixedly connected to the bottom end of the linear guide rail 7 by bolts, and the bottom end of the threaded rod 92 penetrates the lower mounting seat 91 and is fixedly connected with a knob 93;

[0053] Further, as shown in the figure, Figure 6 The equivalent stiffness of the steel plate spring 6 is:

[0054]

[0055] Where E is the Young's modulus, I is the sectional moment of inertia of the steel plate spring 6, and b is the distance from the force point of the two horizontal direction connecting pieces 82 to the middle part. When b decreases, the stiffness of the steel plate spring 6 will increase, and the overall stiffness of the device will increase.

[0056] Further, the inside of the adjusting slider 94 is connected with two guide rods, which are fixed between the two mounting seats 91 in the adjusting mechanism 9, and the guide rods are arranged to guide the adjusting slider 94 when it moves.

[0057] Further, when the connecting piece 82 at the lower supporting point 84 position moves upward, the spring fixing seat does not interfere with the movement of the connecting piece 82.

[0058] It should be further explained that the linear guide rail 7 is fixed on the moving load plate 2 in the vertical direction by bolts, and the top end of the linear guide rail 7 is fixedly connected with a stopper to shield the top end of the linear guide rail 7, preventing the connecting piece 82 at the upper supporting point 83 position from slipping off the linear guide rail 7, and the bottom end of the linear guide rail 7 is fixed with the mounting seat 91 to shield the bottom end of the linear guide rail 7, preventing the connecting piece 82 at the lower supporting point 84 position from slipping off the linear guide rail 7.

[0059] Embodiment Two:

[0060] The embodiment provides a use method of the load-reducing suspension backpack with adjustable rigidity, which comprises the following steps:

[0061] S1. First, load the load-carrying bag with articles, and then the user carries the load-reducing suspension backpack to walk, when the vertical acceleration of the center of mass of the human body changes continuously, the back plate 1 of the load-reducing suspension backpack moves with the center of mass of the human body, at this time, the steel plate spring 6 is bent and deformed, and the compression spring 5 is compressed and deformed, the load-carrying plate drives the load-carrying bag 11 to vibrate up and down on the back plate 1, and generates an out-of-phase motion opposite to the vertical acceleration of the center of mass of the human body, so as to realize the load-reducing function.

[0062] S2. When it is needed to reduce the overall rigidity of the device, the knob 93 is rotated forward to drive the threaded rod 92 to rotate on the two mounting seats 91, so as to drive the adjusting slider 94 to move upward, when the adjusting slider 94 moves upward, the two vertical connecting pieces 82 of the deformable rhombic mechanism 8 simultaneously move close to the center, and the two horizontal connecting pieces 82 simultaneously move away from the center position, at this time, the concentrated stress point on the steel plate spring 6 moves away from the center, and the overall rigidity of the device is reduced.

[0063] S3. When it is needed to increase the overall rigidity of the device, the knob 93 is reversely rotated to drive the threaded rod 92 to rotate, so as to drive the adjusting slider 94 to move downward, when the adjusting slider 94 moves downward, the two vertical connecting pieces 82 of the deformable rhombic mechanism 8 simultaneously move away from the center, and the two horizontal connecting pieces 82 simultaneously move close to the center position, at this time, the concentrated stress point on the steel plate spring 6 moves to the center, and the overall rigidity of the device is increased.

[0064] The principle and process of the present application: the load bag 11 is provided with a load, when the user walks with the load suspension backpack, the center of mass of the human body changes constantly, the backboard 1 of the load suspension backpack moves with the center of mass of the human body, at this time, the steel plate spring 6 is bent and deformed, the compression spring 5 is compressed and deformed, the load moving plate drives the load bag 11 to vibrate up and down on the backboard 1, and the opposite phase motion opposite to the vertical acceleration of the center of mass of the human body is generated, so as to relieve the fatigue of walking, realize the load reduction function, and when carrying different weights of the load, the screw rod 92 is driven to rotate on the two mounting seats 91 through the forward rotation knob 93, the adjusting slider 94 can be driven to move upward, when the adjusting slider 94 moves upward, the two vertical connecting pieces 82 of the deformable rhombus mechanism 8 are close to the center at the same time, and the two horizontal connecting pieces 82 are away from the center position at the same time, at this time, the concentrated stress point on the steel plate spring 6 is away from the middle part, the rigidity of the whole device is reduced, and vice versa, so as to adjust the bending deflection of the steel plate spring 6 according to the weight of the load, increase or reduce the rigidity of the whole device, and enhance the practicability of the device.

[0065] It should be noted that in this document, the terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between such entities or operations. Moreover, the terms "comprises", "comprising", or any other variations thereof are intended to cover non-exclusive inclusions, so that a process, method, article, or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or inherent to such a process, method, article, or device.

[0066] For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to specific circumstances. When an element is referred to as "assembled", "mounted", "fixed" or "provided" to another element, it can be directly on another element or there can be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes, and are not the only embodiment.

[0067] While embodiments of the application have been shown and described, it is to be understood that the application is not limited to the details of the embodiments described, since numerous changes, modifications, substitutions, and alterations can be made thereto without departing from the spirit and scope of the application as defined in the appended claims and their equivalents.

[0068] In the description of the specification, reference to "one embodiment", "an example", "a specific example" or the like means that a particular feature, structure, material or characteristic is included in at least one embodiment or example of the disclosure. The appearances of the above expressions in various places in the specification do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics can be combined in any suitable manner in one or more embodiments or examples.

Claims

1. An adjustable stiffness load-lifting suspension backpack comprising a back panel (1) and a moving load panel (2), characterized in that, The guiding mechanism (3) is arranged between the back plate (1) and the movable load plate (2) and is used for enabling the back plate (1) and the load plate to move relatively in the vertical direction. The spring fixing block (4) is fixedly connected to the side of the back plate (1) facing the movable load plate (2), the top of the spring fixing block (4) is fixedly connected with the compression spring (5), the top end of the compression spring (5) is fixedly connected with the steel plate spring (6), and the compression spring (5) is located in the middle of the steel plate spring (6). The linear guide rail (7) is fixedly connected to the side of the movable load plate (2) facing the back plate (1), the linear guide rail (7) is perpendicular to the steel plate spring (6), the deformable rhombus mechanism (8) is slidably connected to the linear guide rail (7), the deformable rhombus mechanism (8) has four vertices, two vertices in the vertical direction are slidably connected to the linear guide rail (7), and two vertices in the horizontal direction are slidably connected to the steel plate spring (6). The adjusting mechanism (9) is fixedly arranged on the side wall of the movable load plate (2) and is used for adjusting the distance between the two vertices in the vertical direction of the deformable rhombus mechanism (8).

2. The adjustable-stiffness load-lifting suspension backpack of claim 1, wherein: The back plate (1) and the movable load plate (2) are slidably connected through the guiding mechanism (3), the guiding mechanism (3) comprises the slide rail (31) fixedly connected to the side wall of the back plate (1) and the trolley (32) fixedly arranged on the movable load plate (2), and the side wall of the slide rail (31) is provided with the sliding groove matched with the trolley (32).

3. A load equalizing, adjustable stiffness suspension backpack according to claim 2, characterized in that: The number of the slide rails (31) is two, the two slide rails (31) are symmetrically arranged on the back plate (1), and two trolleys (32) are slidably connected to each slide rail (31).

4. The adjustable-stiffness load-lifting suspension backpack of claim 2, wherein: The back plate (1) is fixedly provided with the back strap (10) away from the movable load plate (2), and the movable load plate (2) is fixedly provided with the load bag (11) away from the back plate (1).

5. A load equalizing, adjustable-stiffness suspension backpack according to claim 4, wherein: The linear guide rail (7) is fixedly arranged on the movable load plate (2) in the vertical direction through bolts, and the top end of the linear guide rail (7) is fixedly connected with the stop block.

6. A load equalizing, adjustable-stiffness suspension backpack according to claim 5, wherein: The deformable rhombus mechanism (8) comprises eight connecting rods (81) and four connecting pieces (82), the four connecting pieces (82) are located at the four vertices of the rhombus, and every two connecting rods (81) in the eight connecting rods (81) form a group, and the four groups of connecting rods (81) are rotationally connected to the four connecting pieces (82) as the four sides of the rhombus.

7. A load equalizing, adjustable stiffness suspension backpack according to claim 6, characterized in that: The four connecting pieces (82) comprise two vertical connecting pieces (82) and two horizontal connecting pieces (82), the two vertical connecting pieces (82) are slidably connected to the two ends of the linear guide rail (7), and the two horizontal connecting pieces (82) are slidably connected to the two ends of the steel plate spring (6).

8. A load equalizing, adjustable stiffness suspension backpack according to claim 7, characterized in that: The adjusting mechanism (9) comprises two mounting seats (91) fixedly connected to the side wall of the movable load plate (2), a threaded rod (92) rotationally connected between the two mounting seats (91), the mounting seat (91) located at the top fixedly connected with the bottom end of the linear guide rail (7) through bolts, the bottom end of the threaded rod (92) penetrating through the mounting seat (91) located at the bottom, and the bottom end of the threaded rod (92) fixedly connected with the knob (93).

9. A load equalizing, adjustable stiffness suspension backpack according to claim 8, characterized in that: The side wall of one of the two vertical direction connectors (82) of the deformable rhombic mechanism (8) close to the threaded rod (92) is fixedly connected with an adjusting sliding block (94), and the bottom of the adjusting sliding block (94) is threadedly connected with the threaded rod (92); The inside of the adjusting sliding block (94) is slidably connected with two guide rods, and the two guide rods are fixed between the two mounting seats (91) in the adjusting mechanism (9).

10. A method of using a load-lifting, adjustable-stiffness, levitating backpack of claim 9, wherein, Comprise the following: S1. First, load the load bag (11) with goods, then the user carries the load reduction suspension backpack and walks, when the vertical acceleration of the center of mass of the human body walking changes constantly, the backboard (1) of the load reduction suspension backpack follows the movement of the center of mass of the human body walking, at this time, the steel plate spring (6) is bent and deformed, the compression spring (5) is compressed and deformed, the load moving plate drives the load bag (11) to vibrate up and down on the backboard (1), generates opposite phase motion opposite to the vertical acceleration of the center of mass of the human body, for realizing the function of reducing load; S2. When it is needed to reduce the overall rigidity of the device, rotate the knob (93) in the positive direction to drive the threaded rod (92) to rotate on the two mounting seats (91), which can drive the adjusting sliding block (94) to move upwards, when the adjusting sliding block (94) moves upwards, the two vertical direction connectors (82) of the deformable rhombic mechanism (8) will simultaneously move close to the center, and the two horizontal direction connectors (82) will simultaneously move away from the center position, at this time, the concentrated stress point on the steel plate spring (6) moves away from the middle part, and the overall rigidity of the device is reduced; S3. When it is needed to increase the overall rigidity of the device, rotate the knob (93) in the reverse direction to drive the threaded rod (92) to rotate, thereby driving the adjusting sliding block (94) to move downwards, at this time, the two vertical direction connectors (82) of the deformable rhombic mechanism (8) simultaneously move away from the center, and the two horizontal direction connectors (82) simultaneously move towards the center position, at this time, the concentrated stress point of the steel plate spring (6) moves towards the middle part, and the overall rigidity of the device is increased.

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