Acceleration protection method and device for prolonging acceleration distance based on relative motion

Abstract

The invention relates to the technical field of safety protection of high-speed movement equipment, in particular to an acceleration protection method and device for prolonging an acceleration distance based on relative movement. The device comprises a power main body, a protected carrier and a controllable relative movement mechanism, the controllable relative movement mechanism is connected between the power main body and the protection carrier; wherein the controllable relative movement mechanism is used for controlling the protected carrier to generate linear relative displacement matched with the acceleration of the power main body in the opposite acceleration direction when the power main body accelerates, so that the effective acceleration distance of the protected carrier is prolonged. On the premise that the equipment size is not increased, the impact protection problem under the high acceleration working condition is physically and essentially solved.

Description

Technical Field

[0001] This application relates to the field of safety protection technology for high-speed motion equipment, specifically to an acceleration protection method and device based on relative motion to extend the acceleration distance. Background Technology

[0002] In high-acceleration conditions, such as high-speed transport and precision transportation, the personnel or precision equipment being protected are subjected to enormous instantaneous impacts and force changes. Existing technologies primarily mitigate the impact by incorporating elastic damping and hydraulic buffers within the carrier, but these methods essentially consume kinetic energy and cannot fundamentally extend the acceleration distance. According to the kinematic principle v²=2as, with a constant final velocity v, acceleration a is inversely proportional to acceleration distance s. Given the limited size of the power unit, the acceleration distance s provided by traditional internal buffering methods is extremely limited, resulting in their effect on reducing acceleration a approaching physical limits, making it difficult to meet the demands of higher speeds and greater stability applications. Furthermore, existing buffering devices are mostly disposable or semi-disposable, requiring manual intervention to restore the initial state after each acceleration-buffering process, making automatic reset and multiple cyclic operations impossible. Summary of the Invention

[0003] This application aims to solve at least one of the technical problems in the background art by providing an acceleration protection method and device based on relative motion to extend the acceleration distance.

[0004] This application is achieved through the following technical solution: In a first aspect, this application provides an acceleration protection method based on relative motion to extend the acceleration distance, comprising the following: When the power source drives the protected carrier on it to move in the first direction, the protected carrier moves a predetermined distance in the second direction relative to the power source. When the speed of the power unit and the protected carrier are synchronized in the first direction, the protected carrier moves relative to the power unit in the first direction so that the protected carrier returns to its original position. The first direction and the second direction are opposite.

[0005] In some alternative embodiments, active control is used to move the protected carrier in a second direction.

[0006] In some alternative embodiments, passive control is used to move the protected carrier in a second direction.

[0007] Secondly, this application provides an acceleration protection device based on relative motion extending the acceleration distance, used to implement any of the acceleration protection methods based on relative motion extending the acceleration distance as described in the first aspect, including: Power source; Protected carrier; A controllable relative motion mechanism, wherein the controllable relative motion mechanism is connected between the power body and the protective carrier; The controllable relative motion mechanism is used to control the protected carrier to generate a linear relative displacement in the opposite direction of acceleration that matches the acceleration of the power body when the power body accelerates, so as to extend the effective acceleration distance of the protected carrier.

[0008] In some alternative embodiments, the controllable relative motion mechanism is a linear module. In some optional embodiments, the controllable relative motion mechanism includes at least one flexible traction member, one end of which is connected to the protected carrier, and the other end of which is connected to a reset buffer mechanism, so that the protected carrier moves along the acceleration direction of the power body under the drive of the reset buffer mechanism.

[0009] In some alternative embodiments, the reset buffer mechanism is configured to adjust the length of the flexible traction member between itself and the protected carrier by winding.

[0010] In some alternative embodiments, the number of flexible traction members is configured to be two, with the two flexible traction members symmetrically connected to both sides of the protected carrier.

[0011] In some optional embodiments, the reset buffer mechanism and the protected carrier are located at the rear end and front end of the power body, respectively. The front end of the power body is also connected to a reversing pulley group, and the flexible traction member extends in the opposite direction around the reversing pulley group to the reset buffer mechanism and is connected to the reset buffer mechanism.

[0012] In some alternative embodiments, the reset buffer mechanism is an integrated magnetic levitation roller motor.

[0013] In some optional embodiments, a locking mechanism is further connected to the power unit, the locking mechanism comprising: A locking pin, which is connected to the protected carrier; A lock seat, which is connected to the power unit, and a lock pin and the lock seat can form a pin-lock structure; A driving element is connected to the protected carrier and is driven by the locking pin to drive the locking pin to extend and retract axially.

[0014] Compared with the prior art, this application has the following advantages and beneficial effects: This application extends the effective acceleration distance beyond the dimensions of the power unit by setting a controllable relative motion mechanism between the power unit and the protected carrier. During acceleration, the protected carrier is controlled to generate a linear relative displacement in the opposite direction of acceleration that matches the real-time acceleration of the power unit, thereby extending the effective acceleration distance beyond the dimensions of the power unit itself. According to the kinematic principle v²=2as, with a constant final velocity, the extension of the acceleration distance significantly reduces the acceleration experienced by the protected carrier, improving the smoothness of the acceleration process. Simultaneously, by synchronizing the speed of the protected carrier with that of the power unit at the end of the relative displacement stroke, the hard impact inevitably generated at the end of the stroke by traditional buffer structures is eliminated, achieving impact-free and smooth acceleration. This application solves the impact protection problem under high acceleration conditions from a physical perspective without increasing the size of the equipment, replacing the passive energy dissipation methods of existing elastic damping and hydraulic buffering technologies. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the exemplary embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort. In the drawings: Figure 1 A schematic diagram of the acceleration protection device based on relative motion to extend the acceleration distance, provided in an embodiment of this application.

[0016] The attached diagram shows the markings and corresponding component names: 1-Power source, 2-Protected carrier, 3-Controllable relative motion mechanism, 4-Reset buffer mechanism, 5-Locking mechanism. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this application are only for explaining this application and are not intended to limit this application.

[0018] In a first aspect, embodiments of this application provide an acceleration protection method based on relative motion to extend the acceleration distance, comprising the following: When the power unit 1 drives the protected carrier 2 to move in the first direction, the protected carrier 2 moves a predetermined distance relative to the power unit 1 in the second direction. This means that there can be relative movement between the protected carrier 2 and the power unit 1. For example, the protected carrier 2 can be slidably mounted on the power unit 1, so that when the power unit 1 moves in the first direction, the protected carrier 2 can move relative to the power unit 1. The protected carrier 2 is used to carry personnel, goods, or precision instruments.

[0019] When the speed of the power unit 1 and the protected carrier 2 is synchronized in the first direction, the protected carrier 2 moves relative to the power unit 1 in the first direction so that the protected carrier 2 returns to its original position.

[0020] The first direction and the second direction are opposite.

[0021] It should be noted that, throughout the acceleration process, if the ground is taken as the reference frame, the motion directions of the power unit 1 and the protected carrier 2 are both the first direction.

[0022] In this embodiment of the application, the protected carrier 2 can be actively controlled to generate a relative displacement with respect to the power body 1 in the second direction. For example, a linear module can be used to drive the protected carrier 2 to move.

[0023] The protected carrier 2 can also be passively controlled to generate relative displacement with respect to the power body 1 in the second direction. For example, a hoisting structure can be used to gradually or uniformly release the protected carrier 2, and the protected carrier 2 will generate relative motion with respect to the power body 1 under the action of inertia.

[0024] Secondly, such as Figure 1 As shown, this application provides an acceleration protection device based on relative motion to extend the acceleration distance, which is used to implement any of the acceleration protection methods based on relative motion to extend the acceleration distance described in the first aspect. The acceleration protection device based on relative motion to extend the acceleration distance includes a power body 1, a protected carrier 2, and a controllable relative motion mechanism 3.

[0025] The power unit 1 provides the initial acceleration power for the entire system and is either fixedly installed on the foundation ground or as part of a moving component. The power unit 1 includes a platform body and a linear drive unit mounted on the platform body. The platform body can be designed as a cuboid frame structure made of high-strength extruded aluminum alloy profiles, with a top surface and two side surfaces along its length. The linear drive unit is integrated inside or on the side of the platform body and is used to drive the entire device or cooperate with the protected carrier 2. In practical implementation, the linear drive unit can be the primary winding of a linear motor, which is continuously laid in the internal cavity of the platform body along its length and fixedly connected to the platform body by bolts. In other embodiments, when the application scenario does not require high acceleration, the linear drive unit can also adopt a structure of a servo motor and a ball screw. In this case, the servo motor is fixedly installed at one end of the platform body, and the ball screw is rotatably supported on the platform body through a bearing seat. The nut of the screw is connected to the protected carrier 2. With this configuration, in the high-acceleration application environment of this application, the long stator linear motor can provide uniform and controllable thrust, avoid the influence of transmission gaps and elastic deformation on control accuracy, and ensure the smoothness of power output; at the same time, integrating the linear drive unit into the platform body makes the overall structure compact and easy to protect.

[0026] The power unit 1 is equipped with a guide component located on the platform body. The guide component is used to guide the linear motion of the protected carrier 2, ensuring that its motion trajectory is consistent with the acceleration direction.

[0027] The guiding component includes at least one guide groove formed on the upper surface of the platform body. The guide groove is a through groove, extending from beginning to end along the length of the platform body. Specifically, the guide groove is milled directly onto the upper surface of the platform body through machining, forming an integral structure with the platform body. In practice, the guide groove is preferably a T-shaped groove with a "T"-shaped cross-section, where the bottom width is greater than the opening width, forming two lateral guiding surfaces. In other embodiments, the guide groove can also be a dovetail groove, a V-shaped groove, or a split structure, where two parallel linear guide rails are bolted to the upper surface of the platform body, with the guide rail strips serving as the equivalent structure of the guide groove. This configuration allows the T-shaped groove structure to simultaneously withstand vertical loads and lateral moments, effectively suppressing the pitch and sway of the protected carrier 2 during acceleration, providing a fundamental guarantee for the smooth acceleration of precision loads.

[0028] The protected carrier 2 is used to carry personnel, goods, or precision instruments. It is mechanically decoupled from the power unit 1 through a relative motion mechanism, thus avoiding direct impact from the power unit 1. The protected carrier 2 includes a support frame and rolling guides installed at the bottom of the support frame. The support frame is a box-type or plate-type structure with an interface for mounting loads on its upper part. The rolling guides are bolted to the four bottom corners of the support frame. Each rolling guide slides into a guide groove, meaning it is embedded in the guide groove and can roll along the length of the guide groove. In practical implementation, the rolling guide is preferably a composite roller bearing, which includes a main load-bearing roller that rolls in contact with the bottom surface of the guide groove, and at least two lateral guide rollers that roll in contact with the side walls of the guide groove. Both the main load-bearing roller and the lateral guide rollers are mounted on the same bearing housing via pins. In other embodiments, when the guiding accuracy requirement is low, the rolling guide can also use ordinary deep groove ball bearings or sliding bushings. In this case, a gap is left between the bearing or bushing and the side walls of the guide groove, relying solely on the bottom surface for guidance. This configuration allows the composite roller bearing to achieve three-way positioning with minimal rolling friction, ensuring consistency in the direction of movement without generating additional resistance interference to the relative movement of the protected carrier 2.

[0029] A controllable relative motion mechanism 3 is connected between the power unit 1 and the protected carrier 2. The controllable relative motion mechanism 3 is used to achieve controllable linear relative displacement between the two in the acceleration direction, thereby extending the effective acceleration distance of the protected carrier 2. Specifically, the controllable relative motion mechanism 3 includes at least one flexible traction member. One end of the flexible traction member is connected to the rear end face of the protected carrier 2 (i.e., the end opposite to the acceleration direction), and the other end is connected to a buffer reset mechanism so that the protected carrier 2 moves along the acceleration direction of the power unit 1 under the drive of the reset buffer mechanism 4. Specifically, the flexible traction member has a joint at its end, which is fixed to the rear end of the support frame by a pin or threaded connector. In actual implementation, the flexible traction member is preferably a braided rope made of ultra-high molecular weight polyethylene fiber, which has the characteristics of low density, high tensile strength, and low elongation. In other embodiments, depending on the load size and the usage environment, the flexible traction member can also be a steel wire rope, aramid rope, high-strength polyester belt, or even a chain or synchronous belt. This configuration allows the ultra-high molecular weight polyethylene fiber rope to maintain minimal weight while withstanding enormous tensile forces, avoiding the negative impact of the traction component's own mass inertia on the acceleration process, thereby ensuring precise control.

[0030] In some optional embodiments, the flexible traction element is configured as two ropes, a left traction rope and a right traction rope. The connecting ends of the left and right traction ropes are fixedly connected to the left and right rear ends of the protected carrier 2, respectively, that is, symmetrically arranged on both sides of the longitudinal centerline of the protected carrier 2; the other ends of the two ropes are respectively connected to the reset buffer mechanism 4. In actual implementation, in addition to the symmetrical arrangement of the two ropes, when the width of the protected carrier 2 is small, only one flexible traction element located in the center can be set; when the load is extremely heavy or higher redundancy is required, three or four flexible traction elements distributed in a rectangular shape can also be set. With this configuration, the symmetrical traction structure of the two ropes can completely counteract the deflection torque generated by the traction force, ensuring that the protected carrier 2 does not rotate at all during the entire acceleration process, which is suitable for occasions with extremely high attitude requirements, such as carrying optical instruments.

[0031] In some optional embodiments, the controllable relative motion mechanism 3 further includes a reversing pulley assembly disposed at the front end of the power body 1. The reversing pulley assembly includes at least one guide pulley rotatably supported on the power body 1. Specifically, a bracket is fixedly installed at the front end of the power body 1, and the guide pulley is mounted on the pin of the bracket via bearings. The flexible traction member bypasses the groove of the guide pulley, leading it out from the front end of the protected carrier 2 and then back to the buffer reset mechanism at the rear end. In actual implementation, the guide pulley is preferably a deep groove ball bearing pulley with rolling bearings, and its groove surface is hardened to reduce wear; in other embodiments, when space is limited, a fixed guide surface (such as a ceramic guide ring) can be used instead of the pulley, in which case the flexible traction member slides directly on the arc surface of the guide ring. This arrangement concentrates the relatively large buffer reset mechanism at the rear end, optimizes the system's center of gravity distribution, frees up front-end space, and facilitates load loading, unloading, and maintenance operations; the introduction of low-friction pulleys reduces energy loss in the traction path, provides a guarantee for precise control, and improves the system's engineering feasibility and operational reliability.

[0032] In some optional embodiments, the reset buffer mechanism 4 includes a magnetic levitation take-up and unwind assembly. The magnetic levitation take-up and unwind assembly includes a stator shaft and a double-drum rotor rotatably mounted outside the stator shaft. The stator shaft is a hollow stepped shaft, with both ends bolted to two bearing seats at the front end of the power unit 1, thus fixing it in place. The double-drum rotor is an integral cylindrical structure with an inner diameter larger than the outer diameter of the stator shaft, leaving an annular gap between them. The double-drum rotor is connected to the stator shaft via magnetic levitation bearings, achieving contactless levitation support. Specifically, the magnetic levitation bearings include radial and axial electromagnets mounted on the stator shaft, and position sensors and permanent magnet targets mounted on the inner wall of the double-drum rotor, enabling stable levitation of the rotor through active control. In practical implementation, the magnetic levitation bearings are preferably actively controlled radial magnetic levitation bearings; in other embodiments, in cost-sensitive scenarios, ultra-precision ball bearings or ceramic sliding bearings with lubrication can also be used for support, in which case the double-drum rotor is directly mounted on the stator shaft via the bearings. This configuration eliminates mechanical friction and wear with magnetic levitation support, allowing the device to withstand millions of high-frequency reciprocating acceleration cycles without bearing replacement, thus improving the reliability and service life of the equipment.

[0033] In some optional embodiments, a torque motor assembly is integrated between the stator shaft and the double-drum rotor. The torque motor assembly includes a stator winding embedded on the outer circumference of the stator shaft and a permanent magnet array embedded on the inner circumference of the double-drum rotor, corresponding to the stator winding. The stator winding is fixed to an annular groove in the stator shaft by epoxy resin casting, and its leads are led out through hollow holes inside the stator shaft. The permanent magnet array consists of multiple neodymium iron boron permanent magnets arranged alternately with N and S poles and bonded to the inner wall of the double-drum rotor. In practice, the stator winding is preferably a coreless annular winding to eliminate cogging torque fluctuations; in other embodiments, when higher torque density is required, a cored embedded winding structure can also be used, in which case a slot needs to be created on the stator shaft. This configuration integrates the motor directly into the drum, forming a direct-drive structure. It eliminates intermediate transmission links such as reducers and couplings, thereby eliminating backlash and elastic deformation. This allows the control system to precisely adjust the torque of the drum, thus achieving precise control of the traction force.

[0034] In some optional embodiments, an eddy current damper is integrated between the stator shaft and the double-drum rotor. The eddy current damper includes a damping coil embedded on the outer circumference of the stator shaft and a conductor ring embedded on the inner circumference of the double-drum rotor, corresponding to the damping coil. The damping coil is also fixed to an annular groove in the stator shaft with epoxy resin, and the conductor ring is a copper ring, heat-fitted to the inner wall of the double-drum rotor. There is an air gap between the damping coil and the conductor ring, and the two are arranged opposite each other in the radial direction. In practice, the conductor ring is preferably made of copper or a copper alloy; in other embodiments, an aluminum ring or a silver ring with higher conductivity can also be used. With this configuration, when the system loses power or the control system fails, a non-contact braking torque proportional to the rotor speed can be generated by passing DC current through the damping coil, converting the runaway kinetic energy into heat energy for dissipation, thus playing a role in emergency braking and passive safety protection.

[0035] In some optional embodiments, a locking mechanism 5 is also connected to the power body 1. The locking mechanism 5 includes a locking pin installed on the protected carrier 2 and a locking seat installed at the initial position at the front end of the power body 1 and cooperating with the locking pin. The locking pin is a cylindrical pin that is slidably installed in a guide sleeve at the bottom of the support frame. The rear end of the locking pin is connected to a driving element, which drives its extension and retraction. The locking seat is a metal block with a pin hole, which is fixed to the upper surface of the front end of the power body 1 by bolts, and the pin hole is aligned with the axis of the locking pin. In actual implementation, the driving element is preferably an electromagnet, the moving iron core of which is connected to the locking pin, and the electromagnet housing is fixed to the support frame. In other embodiments, when a greater holding force is required, a pneumatic or hydraulic cylinder can be used for driving, or a mechanical spring reset plus electromagnetic release structure can be used (i.e., the spring pushes the locking pin out under normal conditions, and the locking pin retracts against the spring force when the electromagnet is energized). With this configuration, the locking mechanism 5 can rigidly connect the protected carrier 2 to the power body after resetting. This prevents accidental movement during non-working conditions and provides a precise initial position reference for the next acceleration, ensuring the consistency and repeatability of each acceleration process.

[0036] Working principle: Initial state: The locking pin is inserted into the locking seat, and the protected carrier 2 is locked to the front end of the power unit 1. The motor of the magnetic levitation take-up and unwind assembly is in a power-off levitation state, and the rotor can rotate freely.

[0037] Acceleration Phase: The control system energizes the electromagnet, causing the locking pin to retract and unlock. Power unit 1 begins to accelerate under the drive of the linear drive unit. The protected carrier 2, due to inertia, tends to lag behind, and through the flexible traction component, it pulls the double-drum rotor to rotate, beginning to move backward relative to power unit 1. The control system precisely adjusts the current in the motor stator windings according to a preset curve, causing the rotor to generate a smoothly changing resistance torque, thereby controlling the release speed of the protected carrier 2 and extending the effective acceleration distance. As acceleration nears its end, the control system synchronizes the speed of the protected carrier 2 with that of power unit 1.

[0038] Buffering and Reset: After acceleration ends, if residual kinetic energy remains, the eddy current damper can be activated for contactless braking. Then, the motor reverses, driving the double-drum rotor to retract the traction rope, pulling the protected carrier 2 back to its initial position. Once in place, the locking pin re-inserts into the locking seat, completing the locking process.

[0039] The specific embodiments described above illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Although the description of this application is presented in conjunction with some embodiments, this does not mean that the features of this application are limited to this embodiment. On the contrary, the purpose of describing the application in conjunction with embodiments is to cover other options or modifications that may be derived based on the claims of this application. To provide a thorough understanding of this application, many specific details are included in the above description. This application may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this application, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0040] It should be noted that in this specification, similar reference numerals and letters in the above figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this application, it should be noted that unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0041] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. An acceleration protection method based on extending the acceleration distance through relative motion, characterized in that, Includes the following: When the power unit (1) drives the protected carrier (2) on it to move in the first direction, the protected carrier (2) moves a predetermined distance in the second direction relative to the power unit (1); When the speed of the power unit (1) and the protected carrier (2) is synchronized in the first direction, the protected carrier (2) is moved relative to the power unit (1) in the first direction so that the protected carrier (2) returns to its original position; The first direction and the second direction are opposite.

2. The acceleration protection method based on relative motion extending the acceleration distance according to claim 1, characterized in that, Active control is used to move the protected carrier (2) in the second direction.

3. The acceleration protection method based on relative motion extending the acceleration distance according to claim 1, characterized in that, The protected carrier (2) is moved in the second direction by passive control.

4. An acceleration protection device based on relative motion extending acceleration distance, used to implement the acceleration protection method based on relative motion extending acceleration distance as described in any one of claims 1 to 3, characterized in that, include: Power source (1); Protected carrier (2); A controllable relative motion mechanism (3) is connected between the power body (1) and the protective carrier; The controllable relative motion mechanism (3) is used to control the protected carrier (2) to generate a linear relative displacement that matches the acceleration of the power body (1) in the opposite direction of acceleration when the power body (1) accelerates, so as to extend the effective acceleration distance of the protected carrier (2).

5. The acceleration protection device based on relative motion extending the acceleration distance according to claim 4, characterized in that, The controllable relative motion mechanism (3) is a linear module.

6. The acceleration protection device based on relative motion extending the acceleration distance according to claim 4, characterized in that, The controllable relative motion mechanism (3) includes at least one flexible traction member. One end of the flexible traction member is connected to the protected carrier (2), and the other end of the flexible traction member is connected to the reset buffer mechanism (4) so ​​that the protected carrier (2) moves along the acceleration direction of the power body (1) under the drive of the reset buffer mechanism (4).

7. The acceleration protection device based on relative motion extending the acceleration distance according to claim 6, characterized in that, The reset buffer mechanism (4) is configured to adjust the length of the flexible traction member between itself and the protected carrier (2) by winding.

8. The acceleration protection device based on relative motion to extend acceleration distance according to claim 6, characterized in that, The number of flexible traction components is configured to be two, and the two flexible traction components are symmetrically connected to both sides of the protected carrier (2).

9. The acceleration protection device based on relative motion extending the acceleration distance according to claim 6, characterized in that, The reset buffer mechanism (4) is an integrated magnetic levitation drum motor.

10. The acceleration protection device based on relative motion extending the acceleration distance according to claim 4, characterized in that, The power unit (1) is also connected to a locking mechanism (5), which includes: Locking pin, which is connected to the protected carrier (2); Lock seat, the lock seat is connected to the power body (1), and the lock pin and the lock seat can form a pin lock structure; A driving element is connected to the protected carrier (2) and is connected to the locking pin to drive the locking pin to extend and retract axially.

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