Rigidity-adjustable load-reducing suspension backpack and use method

Abstract

The invention discloses a rigidity-adjustable load-reducing suspension knapsack and a use method, and relates to the technical field of suspension knapsacks. The device comprises a back plate and a movable load plate, and a guide mechanism is installed between the back plate and the movable load plate and used for enabling the back plate and the movable load plate to generate relative movement in the vertical direction; the side, facing the movable load plate, of the back plate is fixedly connected with a spring fixing block, and the top of the spring fixing block is fixedly connected with a compression spring. The steel plate spring and the compression spring are combined, the structure is compact, out-of-phase movement between the backpack and the human body can be kept, the dynamic oscillating force of a man-machine system on the legs is reduced accordingly, the force bearing point loaded on the steel plate spring can be changed through mutual cooperation of the deformable rhombic mechanism and the adjusting mechanism, and the comfort degree of the backpack is improved. And therefore, the length of a vibrating cantilever beam of the steel plate spring is changed, the overall rigidity of the device is adjusted, the device can be conveniently matched with the condition that objects with different weights are carried, and the practicability of the device is improved.

Description

Technical Field

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

[0002] Backpacks are the most common way for humans to carry loads, and they are convenient and fast. However, carrying a load for a long time will cause muscle fatigue and shoulder and leg pain to the user. The traditional backpack load is fixed to the upper body and cannot change its force on the human body. Therefore, the human body needs to consume extra energy to balance the backpack load. The suspension backpack decouples the backpack load from the human body through the suspension system, and changes the force applied by the backpack load on the human body into a dynamic force, thereby changing the impact on the human muscles and bones.

[0003] The suspension system can be realized through active motor control, but the adjustment of the motor will cause the backpack to be too heavy. Another way is to realize the forced vibration of the backpack load through a single degree of freedom vibration system composed of spring damping. However, the stiffness of the single spring damping system limits the weight of the backpack load, and the stiffness of the spring damping system needs to be achieved by replacing the spring, which is inconvenient to operate and has poor practicality. For this reason, the present invention proposes a load-reducing suspension backpack with adjustable stiffness and a method of use. Summary of the invention

[0004] The purpose of the present invention is to provide a load-reducing suspension backpack with adjustable stiffness and a method of use, which can reduce the impact of the dynamic oscillation force of the system on the human body, has a good load-reducing effect, can quickly adjust the stiffness, and is more practical.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solutions: a load-reducing suspension backpack with adjustable stiffness, comprising a back plate and a movable load plate, wherein a guide mechanism is installed between the back plate and the movable load plate, for making the back plate and the load plate 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 movable load plate, a compression spring is fixedly connected to the top of the spring fixing block, a leaf spring is fixedly connected to the top of the compression spring, and the compression spring is located in the middle of the leaf spring;

[0007] A linear guide is fixedly connected to one side of the movable load plate facing the back plate, the linear guide is perpendicular to the leaf spring, a deformable diamond mechanism is slidably connected to the linear guide, the deformable diamond mechanism has four vertices, two vertices along the vertical direction are slidably connected to the linear guide, and two vertices along the horizontal direction are slidably connected to the leaf spring;

[0008] An adjustment mechanism is fixedly mounted on the side wall of the movable load plate, and is used to adjust the distance between two vertices of the deformable diamond mechanism in the vertical direction.

[0009] Furthermore, the back plate is slidably connected to the movable load plate via a guide mechanism, wherein the guide mechanism comprises a slide rail fixedly connected to the side wall of the back plate and a pulley fixedly mounted on the movable load plate, and a slide groove matching the pulley is provided on the side wall of the slide rail.

[0010] Furthermore, there are two slide rails, which are symmetrically installed on the back plate, and two pulleys are slidably connected to each slide rail.

[0011] Furthermore, a shoulder strap is fixedly mounted on a side of the back plate away from the movable load plate, and a load bag is fixedly mounted on a side of the movable load plate away from the back plate.

[0012] Furthermore, the linear guide rail is fixed on the movable load plate along the vertical direction by bolts, and a stopper is fixedly connected to the top end of the linear guide rail.

[0013] Furthermore, the deformable rhombus mechanism includes eight connecting rods and four connecting parts, the four connecting parts are located at the four vertices of the rhombus, every two connecting rods in the eight connecting rods form a group, and the four groups of connecting rods are rotatably connected to the four connecting parts as the four sides of the rhombus.

[0014] Furthermore, the four connecting members include two vertical connecting members and two horizontal connecting members, the two vertical connecting members are slidably connected to the two ends of the linear guide rail, and the two horizontal connecting members are slidably connected to the two ends of the leaf spring.

[0015] Furthermore, the adjustment mechanism includes two mounting seats fixedly connected to the side wall of the movable load plate, a threaded rod is rotatably connected between the two mounting seats, the upper mounting seat is fixedly connected to the bottom end of the linear guide rail by bolts, the bottom end of the threaded rod passes through the lower mounting seat, and the bottom end of the threaded rod is fixedly connected to a knob.

[0016] Furthermore, an adjusting slider is fixedly connected to the side wall of one of the two vertical connecting members of the deformable diamond mechanism close to the threaded rod, and the bottom of the adjusting slider is threadedly connected to the threaded rod;

[0017] The interior of the adjusting slide block is slidably connected to two guide rods, and the two guide rods are fixed between two mounting seats in the adjusting mechanism.

[0018] According to a second aspect of the present invention, the present invention provides a method for using a load-reducing suspension backpack with adjustable stiffness, comprising the following steps:

[0019] S1. First, load the load bag with items, and then the user walks with the load-reducing suspension backpack. When the vertical acceleration of the center of mass of the human body changes continuously, the back plate of the load-reducing suspension backpack moves with the center of mass of the human body. At this time, the leaf spring bends and the compression spring compresses. The load moving plate drives the load bag to vibrate up and down on the back plate, generating an out-of-phase motion opposite to the vertical acceleration of the center of mass of the human body, which is used to achieve the load-reducing function.

[0020] S2. When the overall stiffness of the device needs to be reduced, the knob is turned forward to drive the threaded rod to rotate on the two mounting seats, which can drive the adjustment slider to move upward. When the adjustment slider moves upward, the two vertical connecting parts of the deformable diamond mechanism will move closer to the center at the same time, and the two horizontal connecting parts will move away from the center. At this time, the concentrated force point on the leaf spring is farther away from the middle, and the overall stiffness of the device is reduced;

[0021] S3. When the overall stiffness of the device needs to be increased, the knob is rotated in the opposite direction to drive the threaded rod to rotate, thereby driving the adjusting slider to move downward. The two vertical connecting parts of the deformable diamond mechanism move away from the center at the same time, while the two horizontal connecting parts move toward the center position at the same time. At this time, the concentrated force point of the leaf spring moves toward the middle, and the overall stiffness of the device increases.

[0022] The present invention has at least the following beneficial effects:

[0023] 1. The leaf spring and compression spring used in the present invention are combined, with a compact structure and are passive as a whole. They can maintain out-of-phase movement between the backpack and the human body during daily exercise at various walking speeds and frequencies, thereby reducing the dynamic oscillation force of the human-machine system on the legs, making it less likely for the user to feel tired during walking.

[0024] 2. The present invention can change the stress point of the load on the leaf spring through the mutual cooperation of the deformable diamond mechanism and the adjustment mechanism, thereby changing the length of the vibrating cantilever beam of the leaf spring, achieving the overall stiffness adjustment of the device, facilitating adaptation to the situation of carrying items of different weights, and improving the practicality of the device.

[0025] 3. In the present invention, when no load is applied, the movable load plate is located in the middle and upper part of the back plate. After the load is added, the movable load plate moves downward. Raising the load plate when no heavy objects are initially loaded helps to prevent the load movable plate from falling to the waist of the human body after loading, thereby affecting the user's experience.

[0026] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1It is a three-dimensional schematic diagram of the overall structure of the present invention from a first viewing angle;

[0028] Figure 2 It is a stereoscopic schematic diagram of the overall structure of the present invention from a second viewing angle;

[0029] Figure 3 It is a front view schematic diagram of the deformable diamond mechanism structure of the present invention;

[0030] Figure 4 It is a three-dimensional schematic diagram of the deformable diamond-shaped mechanism structure of the present invention;

[0031] Figure 5 It is a three-dimensional schematic diagram of the leaf spring structure of the present invention;

[0032] Figure 6 It is a schematic diagram of the equivalent principle of the leaf spring and the compression spring stiffness of the present invention;

[0033] Figure 7 It is a schematic diagram of the structure of the overall rigidity reduction of the device of the present invention;

[0034] Figure 8 It is a schematic diagram of the structure of the device of the present invention with improved overall rigidity.

[0035] Reference numerals:

[0036] 1. Back plate; 2. Mobile load plate; 3. Guide mechanism; 31. Slide rail; 32. Pulley; 4. Spring fixing block; 5. Compression spring; 6. Leaf spring; 7. Linear guide; 8. Deformable diamond mechanism; 81. Connecting rod; 82. Connecting piece; 83. Upper fulcrum; 84. Lower fulcrum; 85. Left fulcrum; 86. Right fulcrum; 9. Adjustment mechanism; 91. Mounting seat; 92. Threaded rod; 93. Knob; 94. Adjustment slider; 10. Shoulder strap; 11. Load bag. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions 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 ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0038] When a person is walking, the vertical movement of the center of mass of the person is similar to the sinusoidal movement, and this sinusoidal movement 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 person. For an ordinary backpack, the load is fixed to the person, and the vertical movement of the center of mass of the system of the load, the person and the person's own center of mass does not change. Therefore, the appearance of the load increases the amplitude of the oscillating force of the ground reaction force borne by the lower limbs and feet of the person, causing an additional burden on the human muscles and consuming additional energy. By using a load-reducing suspension backpack, the load is decoupled from the human body's movement, and the center of mass movement of the load is out of phase with the center of mass movement of the person's own, so that the amplitude of the system center of mass movement of the load and the person is reduced in the vertical direction. Compared with the amplitude of the system oscillation force generated by an ordinary backpack, the amplitude of the system oscillation force generated by the load-reducing suspension backpack is reduced, and the energy consumption of the human muscles is alleviated, thereby alleviating fatigue during walking and achieving the load-reducing function.

[0039] Embodiment 1:

[0040] See also Figure 1 and Figure 2 The present invention provides a technical solution: a load-reducing suspension backpack with adjustable stiffness, comprising a back plate 1 and a movable load plate 2, wherein a guide mechanism 3 is installed between the back plate 1 and the movable load plate 2, for making the back plate 1 and the load plate move relative to each other in the vertical direction;

[0041] A spring fixing block 4 is fixedly connected to one side of the back plate 1 facing the movable load plate 2, a compression spring 5 is fixedly connected to the top of the spring fixing block 4, a leaf spring 6 is fixedly connected to the top of the compression spring 5, and the compression spring 5 is located in the middle of the leaf spring 6;

[0042] A linear guide rail 7 is fixedly connected to one side of the mobile load plate 2 facing the back plate 1. The linear guide rail 7 is perpendicular to the leaf spring 6. A deformable diamond mechanism 8 is slidably connected to the linear guide rail 7. The deformable diamond mechanism 8 has four vertices, two vertices along the vertical direction are slidably connected to the linear guide rail 7, and two vertices along the horizontal direction are slidably connected to the leaf spring 6.

[0043] An adjusting mechanism 9 is fixedly mounted on the side wall of the movable load plate 2 , and is used to adjust the distance between two vertices of the deformable diamond mechanism 8 in the vertical direction.

[0044] According to the technical solution of this embodiment, the back plate 1 and the movable load plate 2 are made of carbon fiber material as a whole. The back plate 1 and the movable load plate 2 are slidably connected via a guide mechanism 3. The guide mechanism 3 includes a slide rail 31 fixedly connected to the side wall of the back plate 1 and a pulley 32 fixedly installed on the movable load plate 2. A slide groove matching the pulley 32 is provided on the side wall of the slide rail 31.

[0045] Furthermore, when no load is applied, the movable load plate 2 is located in the middle and upper part of the back plate 1. After the load is added, the movable load plate 2 moves downward. Raising the load plate when no heavy objects are initially loaded helps to prevent the load-moving plate from falling to the waist of the human body after loading, thereby affecting the user's experience.

[0046] Furthermore, there are two slide rails 31, which are symmetrically installed on the back plate 1, and each slide rail 31 is slidably connected to two pulleys 32. The use of four pulleys 32 ensures the vertical up and down movement of the movable load plate 2. The pulley 32 reciprocates up and down in the slide groove of the slide rail 31, and the slide groove and the pulley 32 are limited to each other. During the up and down movement of the movable load plate 2, the pulley 32 will not be separated from the slide groove, so as to enhance stability.

[0047] According to the technical solution of this embodiment, a shoulder strap 10 is fixedly installed on the side of the back plate 1 away from the mobile load plate 2, and a load bag 11 is fixedly installed on the side of the mobile load plate 2 away from the back plate 1. A plurality of square grooves are opened on the four corner side walls of the mobile load plate 2, and the load bag 11 is fixed on the square grooves by means of ropes passing through them.

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

[0049] For the technical solution of this embodiment, Figure 3 As shown, the deformable diamond mechanism 8 is made of carbon fiber as a whole. The deformable diamond mechanism 8 includes eight connecting rods 81 and four connecting members 82. The four connecting members 82 are located at the four vertices of the diamond, namely, an upper fulcrum 83, a lower fulcrum 84, a left fulcrum 85 and a right fulcrum 86. Every two connecting rods 81 in the eight connecting rods 81 form a group. The four groups of connecting rods 81 are rotatably connected to the four connecting members 82 as the four sides of the diamond.

[0050] like Figure 4 As shown, the four connecting members 82 include two vertical connecting members 82 and two horizontal connecting members 82. The two vertical connecting members 82 are slidably connected to the two ends of the linear guide 7, and the two horizontal connecting members 82 are slidably connected to the two ends of the leaf spring 6. The leaf spring 6 presents cantilever beams on both sides. The positions of the two horizontal connecting members 82 are different, the force points of the cantilever beams are different, the bending degrees are different, and the amplitudes of forced vibrations during movement are different.

[0051] For the technical solution of this embodiment, Figure 3 and Figure 4As shown, the adjustment mechanism 9 includes two mounting seats 91 fixedly connected to the side wall of the movable load plate 2, a threaded rod 92 is 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, the bottom end of the threaded rod 92 passes through the lower mounting seat 91, and the bottom end of the threaded rod 92 is fixedly connected to a knob 93;

[0052] An adjusting slider 94 is fixedly connected to the side wall of one of the two vertical connecting members 82 of the deformable diamond mechanism 8, which is close to the threaded rod 92. The bottom of the adjusting slider 94 is threadedly connected to the threaded rod 92. It should be noted that the overall stiffness of the device is the series result of the stiffness of the leaf spring 6 and the stiffness of the compression spring 5. The stiffness of the compression spring 5 is a fixed value, and the stiffness of the leaf spring 6 is a variable. When the overall stiffness of the device needs to be adjusted, the knob 93 is turned forward to drive the threaded rod 92 to rotate on the two mounting seats 91. At this time, the meshing relationship between the adjusting slider 94 and the threaded rod 92 can be used to drive the adjusting slider 94 to rotate. The joint slider 94 moves upward. When the adjusting slider 94 moves upward, the lower fulcrum 84 of the deformable diamond mechanism 8 follows the adjusting slider 94 and moves upward along the linear guide rail 7. Correspondingly, under the interaction of the connecting rod 81, the upper fulcrum 83 is driven to move downward along the linear guide rail 7, so that the two vertical connecting members 82 are simultaneously close to the center. At the same time, the left fulcrum 85 and the right fulcrum 86 of the deformable diamond mechanism 8 are moved away from each other, so that the two horizontal connecting members 82 are moved away from the center position. At this time, the concentrated force point on the leaf spring 6 is increased in distance from the middle, and the overall stiffness of the device is reduced. Figure 7 As shown; on the contrary, when the knob 93 is rotated in the opposite direction to drive the threaded rod 92 to rotate, thereby driving the adjusting slider 94 to move downward, the lower fulcrum 84 of the deformable diamond mechanism 8 moves downward along the linear guide rail 7, and the upper fulcrum 83 moves upward along the linear guide rail 7. The two vertical connecting members 82 move away from the center at the same time, while the two horizontal connecting members 82 move toward the center position at the same time. At this time, the concentrated force point of the leaf spring 6 moves toward the middle, and the overall stiffness of the device increases, as shown in FIG. Figure 8 As shown, by adjusting the overall stiffness of the device, it is convenient to adapt to carrying items of different weights. It should be noted that the overall stiffness of the device only needs to be adjusted when the load weight changes, and no adjustment is required when the user's walking speed is irregular.

[0053] Furthermore, if Figure 6 As shown, the equivalent stiffness of the leaf spring 6 is:

[0054]

[0055] Among them, E is Young's modulus, I is the section inertia moment of the leaf spring 6, and b is the distance from the force point to the middle of the two horizontal connecting parts 82. When b decreases, the stiffness of the leaf spring 6 will increase, and the overall stiffness of the device will increase.

[0056] Furthermore, the adjusting slider 94 is internally slidably connected with two guide rods, which are fixed between two mounting seats 91 in the adjusting mechanism 9. The provided guide rods are used to provide guidance for the adjusting slider 94 when it moves.

[0057] Furthermore, when the connecting member 82 at the lower fulcrum 84 moves upward, the spring fixing seat does not interfere with the movement of the connecting member 82 .

[0058] It should be further explained that the linear guide rail 7 is fixed to the movable load plate 2 in the vertical direction by bolts, and a block is fixedly connected to the top of the linear guide rail 7 to facilitate shielding the top of the linear guide rail 7 to prevent the connecting piece 82 at the upper fulcrum 83 from slipping off the linear guide rail 7, and the bottom end of the linear guide rail 7 is fixed to the mounting seat 91, which can shield the bottom end of the linear guide rail 7 to prevent the connecting piece 82 at the lower fulcrum 84 from slipping off the linear guide rail 7.

[0059] Embodiment 2:

[0060] This embodiment provides a method for using a load-reducing suspension backpack with adjustable stiffness, including the following steps:

[0061] S1. First, load the load bag with items, and then the user walks with the load-reducing suspension backpack. 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 leaf spring 6 is bent and deformed, and the compression spring 5 is compressed and deformed. The load moving plate drives the load bag 11 to vibrate up and down on the back plate 1, generating an out-of-phase motion opposite to the vertical acceleration of the center of mass of the human body, which is used to achieve the load-reducing function.

[0062] S2. When the overall stiffness of the device needs to be reduced, the knob 93 is rotated forward to drive the threaded rod 92 to rotate on the two mounting seats 91, which can drive the adjusting slider 94 to move upward. When the adjusting slider 94 moves upward, the two vertical connecting members 82 of the deformable diamond mechanism 8 will move closer to the center at the same time, and the two horizontal connecting members 82 will move away from the center position. At this time, the concentrated force point on the leaf spring 6 is farther away from the middle, and the overall stiffness of the device is reduced;

[0063] S3. When the overall stiffness of the device needs to be increased, the knob 93 is rotated in the opposite direction to drive the threaded rod 92 to rotate, thereby driving the adjusting slider 94 to move downward. The two vertical connecting parts 82 of the deformable diamond mechanism 8 move away from the center at the same time, while the two horizontal connecting parts 82 move toward the center position at the same time. At this time, the concentrated force point of the leaf spring 6 moves toward the middle, and the overall stiffness of the device increases.

[0064] The use principle and process of the present invention are as follows: the load bag 11 contains a load weight, and when the user walks with the load-reducing suspension backpack, 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 follows the center of mass of the human body, and at this time, the leaf spring 6 is bent and deformed, and the compression spring 5 is compressed and deformed, and the load moving plate drives the load bag 11 to vibrate up and down on the back plate 1, generating an out-of-phase motion opposite to the vertical acceleration of the center of mass of the human body, thereby alleviating fatigue during walking and realizing the load-reducing function. Moreover, when carrying loads of different weights, the threaded rod 92 is driven to rotate on the two mounting seats 91 by rotating the knob 93 in the forward direction, which can drive the adjusting slider 94 to move upward. When the adjusting slider 94 moves upward, the variable The two vertical connecting parts 82 of the diamond-shaped mechanism 8 will approach the center at the same time, and the two horizontal connecting parts 82 will move away from the center position. At this time, the concentrated force point on the leaf spring 6 is farther away from the middle, and the overall stiffness of the device is reduced. Conversely, the overall stiffness of the device can be increased, so that the bending deflection of the leaf spring 6 can be adjusted according to the load weight, the overall stiffness of the device can be increased or decreased, and the practicality of the device can be enhanced. It should be noted that the center of mass movement of the mobile load plate 2 and the load bag 11 is always out of phase with the center of mass movement of the user, the vertical acceleration amplitude of the center of mass of the entire user and the load-reducing suspension backpack system is reduced, and the peak value of the system dynamic oscillation force borne by the user's lower limbs and feet is reduced, which effectively reduces the burden on the leg muscles.

[0065] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, 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 also includes elements inherent to such process, method, article or device.

[0066] For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. When an element is referred to as being "assembled on", "installed on", "fixed on" or "set on" another element, it can be directly on the other element or there can also be a centered element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be a centered element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes and are not intended to be the only implementation method.

[0067] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

[0068] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

Claims

1. A load-reducing suspension backpack with adjustable stiffness, comprising a back plate (1) and a movable load plate (2), characterized in that: A guide mechanism (3) is installed between the back plate (1) and the movable load plate (2) for enabling the back plate (1) and the load plate to move relative to each other in a vertical direction; A spring fixing block (4) is fixedly connected to the side of the back plate (1) facing the movable load plate (2), a compression spring (5) is fixedly connected to the top of the spring fixing block (4), a steel leaf spring (6) is fixedly connected to the top of the compression spring (5), and the compression spring (5) is located in the middle of the steel leaf spring (6); A linear guide rail (7) is fixedly connected to one side of the movable load plate (2) facing the back plate (1), the linear guide rail (7) being perpendicular to the leaf spring (6), a deformable diamond mechanism (8) being slidably connected to the linear guide rail (7), the deformable diamond mechanism (8) having four vertices, two vertices in the vertical direction being slidably connected to the linear guide rail (7), and two vertices in the horizontal direction being slidably connected to the leaf spring (6); An adjustment mechanism (9) is fixedly mounted on the side wall of the movable load plate (2) and is used to adjust the distance between two vertices of the deformable rhombus mechanism (8) in the vertical direction.

2. The load-reducing suspension backpack with adjustable stiffness according to claim 1, characterized in that: The back plate (1) and the movable load plate (2) are slidably connected via a guide mechanism (3), wherein the guide mechanism (3) comprises a slide rail (31) fixedly connected to the side wall of the back plate (1) and a pulley (32) fixedly mounted on the movable load plate (2), and a slide groove matching the pulley (32) is provided on the side wall of the slide rail (31).

3. The load-reducing suspension backpack with adjustable stiffness according to claim 2, characterized in that: There are two slide rails (31), which are symmetrically mounted on the back plate (1), and each slide rail (31) is slidably connected to two pulleys (32).

4. The load-reducing suspension backpack with adjustable stiffness according to claim 2, characterized in that: A shoulder strap (10) is fixedly mounted on the side of the back plate (1) away from the movable load plate (2), and a load bag (11) is fixedly mounted on the side of the movable load plate (2) away from the back plate (1).

5. The load-reducing suspension backpack with adjustable stiffness according to claim 4, characterized in that: The linear guide rail (7) is fixed on the movable load plate (2) in a vertical direction by means of bolts, and a stopper is fixedly connected to the top end of the linear guide rail (7).

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

7. The load-reducing suspension backpack with adjustable stiffness according to claim 6, characterized in that: The four connecting members (82) include two vertical connecting members (82) and two horizontal connecting members (82), the two vertical connecting members (82) are slidably connected to the two ends of the linear guide rail (7), and the two horizontal connecting members (82) are slidably connected to the two ends of the leaf spring (6).

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

9. The load-reducing suspension backpack with adjustable stiffness according to claim 8, characterized in that: An adjusting slider (94) is fixedly connected to the side wall of one of the two vertical connecting members (82) of the deformable diamond mechanism (8) that is close to the threaded rod (92), and the bottom of the adjusting slider (94) is threadedly connected to the threaded rod (92); The adjusting slide block (94) is internally slidably connected to two guide rods, and the two guide rods are fixed between two mounting seats (91) in the adjusting mechanism (9).

10. A method for using a load-reducing suspension backpack with adjustable stiffness, characterized in that: These include: S1. First, load the load bag (11) with items, and then the user walks with the load-reducing suspension backpack on his back. 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 along with the center of mass of the human body. At this time, the leaf spring (6) bends and deforms, the compression spring (5) compresses and deforms, and the load moving plate drives the load bag (11) to vibrate up and down on the back plate (1), generating 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. S2. When the overall stiffness of the device needs to be reduced, the knob (93) is rotated in the forward direction to drive the threaded rod (92) to rotate on the two mounting seats (91), which can drive the adjusting slider (94) to move upward. When the adjusting slider (94) moves upward, the two vertical connecting members (82) of the deformable diamond mechanism (8) will simultaneously move closer to the center, while the two horizontal connecting members (82) will move away from the center position. At this time, the concentrated force point on the leaf spring (6) is farther away from the middle, and the overall stiffness of the device is reduced; S3. When the overall stiffness of the device needs to be increased, the knob (93) is rotated in the opposite direction to drive the threaded rod (92) to rotate, thereby driving the adjusting slider (94) to move downward. The two vertical connecting parts (82) of the deformable diamond mechanism (8) move away from the center at the same time, while the two horizontal connecting parts (82) move toward the center position at the same time. At this time, the concentrated force point of the leaf spring (6) moves toward the middle, and the overall stiffness of the device is increased.

Images