Manual micro-nano positioning platform capable of being locked at tail end

Abstract

The invention provides a manual micro-nano positioning platform capable of being locked at the tail end, and belongs to the technical field of micro-nano positioning, the manual micro-nano positioning platform comprises a device shell mechanism, a sealing cover is arranged at the top of the device shell mechanism, and a carrying platform mechanism is arranged at the top of the sealing cover. According to the manual micro-nano positioning platform capable of being locked at the tail end, a novel guide mechanism suitable for a coarse-fine integrated platform is provided, a sliding block, a guide rail and a sliding block framework are adopted, double-layer balls in the guide rail and the sliding block have higher precision, better bearing capacity and lower friction resistance, and a double-layer flexible scaling mechanism is adopted, so that the stability of the platform is improved. Two micrometer heads are used for respectively controlling, the lower layer is used for amplifying and outputting input displacement, the upper layer is used for reducing and outputting the input displacement, a wide-range and high-precision positioning function is achieved, three adjusting states of coarse adjustment, fine adjustment and locking can be achieved in cooperation with a control circuit, good operation convenience is achieved, and the stability and the anti-interference capacity of the platform are remarkably improved.

Description

Technical Field

[0001] This invention belongs to the technical field of micro-nano positioning, specifically relating to a manual micro-nano positioning platform with end-capable locking. Background Technology

[0002] Micro-nano positioning platforms are widely used in aerospace, optical measurement, and precision manufacturing. Currently, piezoelectric ceramic-driven micro-nano positioning platforms are the mainstream products on the market. However, these platforms are limited by the inherent properties of piezoelectric ceramic materials, which easily generate nonlinear effects such as hysteresis and creep. These are the main factors affecting their positioning accuracy. At the same time, the control system of piezoelectric ceramic-driven micro-nano positioning platforms is complex, resulting in high costs. In summary, such platforms have problems such as high manufacturing difficulty, high cost, and cumbersome maintenance, making it difficult to widely penetrate into low-level application markets. In contrast, positioning platforms using manual control with a differential head offer a more competitive advantage. Micro-nano positioning platforms are widely used due to their low cost and ease of operation. However, micro-nano platforms that rely solely on the micrometer head and lack flexible scaling mechanisms have relatively low positioning accuracy. While platforms equipped with flexible scaling mechanisms can significantly improve manual positioning accuracy, their range is greatly shortened, failing to meet the adjustment requirements at the micrometer scale. Furthermore, the stability and anti-interference capabilities of micro-nano positioning platforms are key indicators that determine their service performance and cannot be ignored. Therefore, designing a micro-nano positioning platform that combines the advantages of large range, high accuracy, and low cost, and also has end-point locking functionality, has become an urgent problem to be solved. Summary of the Invention

[0003] The purpose of this invention is to provide a manually operated micro / nano positioning platform with end-locking capability, aiming to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A manually operated micro / nano positioning platform with end-locking capability, comprising, The device housing has a sealing cover on top, a platform mechanism on top of the sealing cover, a button on the right side of the front of the housing, a micrometer head body on the right side of the housing, a lower flexible amplification mechanism at the bottom of the inner cavity, fixed slider mechanisms on the front and rear sides of the inner cavity, a guide mechanism on the inner side of the fixed slider mechanism, an upper flexible amplification mechanism on the right side of the top of the guide mechanism, a movable slider mechanism on the left side of the top of the guide mechanism, spring magnetic attraction devices on the front and rear sides of the top and bottom of the guide mechanism, wires on the front and rear sides of the inner cavity, a battery body on the left side of the housing, and partitions on the front and rear sides of the top of the guide mechanism.

[0005] As a preferred embodiment of the present invention, the device housing mechanism includes a housing body, a battery mounting slot is provided on the left side of the housing body, the inner cavity of the battery mounting slot is installed with the battery body, L-shaped mounting platforms are fixed on both sides of the inner cavity of the housing body, a first middle mounting platform is fixed in the inner cavity of the housing body, a first side mounting platform is fixed at the front end and rear end of the inner cavity of the housing body, a lower mounting hole is provided in the inner cavity of the housing body, and an upper mounting hole is provided in the inner cavity of the housing body.

[0006] As a preferred embodiment of the present invention, the loading platform mechanism includes a platform body, and a mounting part is fixed to the right side of the bottom of the platform body. The bottom of the mounting part is fixed to the plane of the top of the movable slider mechanism.

[0007] As a preferred embodiment of the present invention, the lower flexible amplification mechanism includes a first displacement input end, a first side fixing hole is provided on the front and rear sides of the first displacement input end, a first central fixing hole is provided at the center of the first displacement input end, and a first displacement output end is fixed on the left side of the first displacement input end.

[0008] As a preferred embodiment of the present invention, the upper flexible amplification mechanism includes a second displacement input end, with second side fixing holes provided on both the front and rear sides of the second displacement input end, a second central fixing hole provided at the center of the second displacement input end, and a second displacement output end fixed on the left side of the second displacement input end.

[0009] As a preferred embodiment of the present invention, the fixed slider mechanism includes a fixed slider housing, the inner cavity of which is provided with a first guide groove, and the inner cavity of the first guide groove is provided with a first ball groove.

[0010] As a preferred embodiment of the present invention, the movable slider mechanism includes a movable slider housing, an upper mounting platform is fixed to the top of the movable slider housing, a second guide rail groove is provided at the bottom of the movable slider housing, and a second ball groove is provided in the inner cavity of the second guide rail groove.

[0011] The guiding mechanism includes a second side mounting platform, the top of which has an upper micrometer head mounting hole, a second middle mounting platform fixed on the second side mounting platform, a lower extension fixed at the bottom of the second side mounting platform, a lower mounting platform fixed at the bottom of the lower extension, lower guide rails fixed on both sides of the lower extension, and an upper guide rail fixed at the top of the lower extension.

[0012] The spring magnetic attraction device includes a base, and a square electromagnet is fixed to the top of the base. An embedded metal plate is provided at the intervals on the top of the square electromagnet. A rubber friction strip is provided on the top of the embedded metal plate. Spring bodies are fixed to both sides of the base, and the top of the spring body is fixed to the bottom of the embedded metal plate.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention proposes a manual micro-nano positioning platform with end-locking capability, and proposes a novel guiding mechanism suitable for coarse and fine integrated platforms. It adopts a slider, guide rail and slider architecture. The double-layer ball bearings inside the guide rail and slider have higher precision, better load-bearing capacity and lower frictional resistance. It adopts a double-layer flexible scaling mechanism, which is controlled by two micro heads. The lower layer amplifies the input displacement and outputs it, while the upper layer reduces the input displacement and outputs it, realizing a large range and high-precision positioning function. With the help of the control circuit, it can realize three adjustment states: coarse adjustment, fine adjustment and locking. It has good operation convenience and significantly improves the stability and anti-interference capability of the platform. By integrating the design of the guiding mechanism, the spring magnetic attraction device, the end-locking mechanism, and the coarse and fine grading mechanism, the device can achieve the following during operation: 1. The micrometer head controls the positioning position, and the button controls the coarse and fine adjustment modes for easy operation; 2. The flexible scaling mechanism is used in layers, enabling the device to have a large range and high precision positioning function; 3. The guiding mechanism and the spring magnetic attraction device work together to achieve end-locking, which greatly improves the stability and anti-interference ability of the device. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein: Figure 1 This is a schematic diagram of the overall external structure of the device of the present invention; Figure 2 This is a schematic diagram of the internal structure of the overall device of the present invention; Figure 3 This is a schematic diagram of the outer casing structure of the device of the present invention; Figure 4 This is a schematic diagram of the cargo platform structure of the present invention; Figure 5 This is a schematic diagram of the differential head structure of the present invention; Figure 6 This is a schematic diagram of the lower flexible amplification mechanism structure of the present invention; Figure 7 This is a schematic diagram of the upper flexible shrinkage mechanism structure of the present invention; Figure 8 This is a cross-sectional view of the fixed slider of the present invention; Figure 9 This is a partial cross-sectional view of the fixed slider of the present invention; Figure 10 This is a cross-sectional view of the movable slider of the present invention; Figure 11 This is a schematic diagram of the guiding mechanism structure of the present invention; Figure 12 This is a schematic diagram of the spring magnetic attraction device of the present invention; Figure 13 This is a schematic diagram of the battery structure of the present invention.

[0015] In the diagram: 1. Device housing mechanism; 101. Housing body; 102. Battery mounting slot; 103. L-shaped mounting platform; 104. First central mounting platform; 105. First side mounting platform; 106. Lower mounting hole; 107. Upper mounting hole; 2. Sealing cover; 3. Loading platform mechanism; 301. Platform body; 302. Mounting part; 4. Button; 5. Micrometer head body; 6. Lower flexible amplification mechanism; 601. First displacement input end; 602. First side fixing hole; 603. First central fixing hole; 604. First displacement output end; 7. Upper flexible amplification mechanism; 701. Second displacement input end; 702. Second side fixing hole; 703. Second central fixing hole; 704. Second displacement output end; 8. Fixed slider Mechanism; 801, Fixed slider housing; 802, First guide rail groove; 803, First ball groove; 9, Moving slider mechanism; 901, Moving slider housing; 902, Upper mounting platform; 903, Second guide rail groove; 904, Second ball groove; 10, Guide mechanism; 1001, Upper micrometer head mounting hole; 1002, Second side mounting platform; 1003, Second middle mounting platform; 1004, Upper guide rail; 1005, Lower guide rail; 1006, Lower mounting platform; 1007, Lower extension; 11, Spring magnetic attraction device; 1101, Base; 1102, Square electromagnet; 1103, Embedded metal sheet; 1104, Rubber friction strip; 1105, Spring body; 12, Wire; 13, Battery body; 14, Divider. Detailed Implementation

[0016] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0017] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0018] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments. Example

[0019] Reference Figure 1-13 This embodiment of the invention provides a manually adjustable micro / nano positioning platform with end-locking capability, comprising: The device housing mechanism 1 has a sealing cover 2 on its top, a loading platform mechanism 3 on its top, a button 4 on the right side of the front of the device housing mechanism 1, a micrometer head body 5 on the right side of the device housing mechanism 1, a lower flexible amplification mechanism 6 at the bottom of the inner cavity of the device housing mechanism 1, a fixed slider mechanism 8 on both the front and rear sides of the inner cavity of the device housing mechanism 1, a guide mechanism 10 on the inner side of the fixed slider mechanism 8, an upper flexible amplification mechanism 7 on the right side of the top of the guide mechanism 10, a movable slider mechanism 9 on the left side of the top of the guide mechanism 10, a spring magnetic attraction device 11 on both the front and rear sides of the top and bottom of the guide mechanism 10, a wire 12 on both the front and rear sides of the inner cavity of the device housing mechanism 1, a battery body 13 on the left side of the device housing mechanism 1, and a partition 14 on both the front and rear sides of the top of the guide mechanism 10.

[0020] The device housing mechanism 1 includes a housing body 101. A battery mounting slot 102 is provided on the left side of the housing body 101. The inner cavity of the battery mounting slot 102 is installed with the battery body 13. L-shaped mounting platforms 103 are fixed on both sides of the inner cavity of the housing body 101. A first middle mounting platform 104 is fixed in the inner cavity of the housing body 101. A first side mounting platform 105 is fixed at the front end and rear end of the inner cavity of the housing body 101. A lower mounting hole 106 and an upper mounting hole 107 are provided in the inner cavity of the housing body 101.

[0021] Specifically, the loading platform mechanism 3 includes a platform body 301, and a mounting part 302 is fixed on the right side of the bottom of the platform body 301. The bottom of the mounting part 302 is fixed to the plane of the top of the movable slider mechanism 9.

[0022] Furthermore, the lower flexible amplification mechanism 6 includes a first displacement input end 601, with first side fixing holes 602 on both the front and rear sides of the first displacement input end 601, a first central fixing hole 603 at the center of the first displacement input end 601, and a first displacement output end 604 fixed on the left side of the first displacement input end 601.

[0023] Preferably, the upper flexible amplification mechanism 7 includes a second displacement input end 701, with second side fixing holes 702 on both the front and rear sides of the second displacement input end 701, a second central fixing hole 703 at the center of the second displacement input end 701, and a second displacement output end 704 fixed on the left side of the second displacement input end 701.

[0024] It should be noted that the fixed slider mechanism 8 includes a fixed slider housing 801, the inner cavity of the fixed slider housing 801 is provided with a first guide groove 802, and the inner cavity of the first guide groove 802 is provided with a first ball groove 803.

[0025] The movable slider mechanism 9 includes a movable slider housing 901, an upper mounting platform 902 fixed to the top of the movable slider housing 901, a second guide rail groove 903 opened at the bottom of the movable slider housing 901, and a second ball groove 904 opened in the inner cavity of the second guide rail groove 903.

[0026] The guide mechanism 10 includes a second side mounting platform 1002. The top of the second side mounting platform 1002 is provided with an upper micro-head mounting hole 1001. A second middle mounting platform 1003 is fixed on the second side mounting platform 1002. A lower extension 1007 is fixed at the bottom of the second side mounting platform 1002. A lower mounting platform 1006 is fixed at the bottom of the lower extension 1007. Lower guide rails 1005 are fixed on both sides of the lower extension 1007. An upper guide rail 1004 is fixed at the top of the lower extension 1007.

[0027] The spring magnetic attraction device 11 includes a base 1101, a square electromagnet 1102 fixed on the top of the base 1101, an embedded metal plate 1103 provided at the intervals on the top of the square electromagnet 1102, a rubber friction strip 1104 provided on the top of the embedded metal plate 1103, and a spring body 1105 fixed on both sides of the base 1101, with the top of the spring body 1105 fixed to the bottom of the embedded metal plate 1103.

[0028] During use, the control state is adjusted via two buttons 4: In the initial state, both buttons 4 are in the relaxed state, the electromagnets of the four spring magnetic attraction devices 11 are not powered, and the compressed spring body 1105 provides elasticity to keep the rubber friction strip 1104 tightly against the side wall of the moving slider mechanism 9 and the side wall of the guide rail extension, thus locking the end of the platform body 301. When making coarse adjustments, press button 4, and the square electromagnets 1102 of the two lower spring magnetic attraction devices 11 are powered. The attraction force of the square electromagnets 1102 is greater than the elasticity of the further compressed spring body 1105, attracting the embedded metal piece 1103 on the inner side of the rubber friction strip 1104. The rubber friction strip 1104 separates from the side wall of the lower extension of the guide rail. At this time, the two upper spring magnetic attraction devices... Device 11 remains locked, and the guide mechanism 10, the sliding slider mechanism 9, and the platform mechanism 3 are fixed as a whole. A slight rotation of the lower micrometer head causes the input displacement to move the guide mechanism 10 and the platform mechanism 3 over a larger range via the lower flexible amplification mechanism 6. After coarse adjustment, fine adjustment is performed. When button 4 is pressed, button 4 automatically returns to its original position, and the square electromagnets 1102 of the two upper spring magnetic attraction devices 11 are powered, attracting the embedded metal sheet 1103 inside the rubber friction strip 1104. The rubber friction strip 1104 separates from the side wall of the sliding slider mechanism 9. At this time, the two lower spring magnetic attraction devices 11 remain locked, and the sliding slider mechanism 9 and the platform mechanism 3 are fixed as a whole. A slight rotation of the upper micrometer head... The input displacement will drive the platform mechanism 3 to perform high-precision positioning through the upper flexible amplification mechanism 7. After positioning, press the second button 4 again to restore it. The power supply to the four spring magnetic attraction devices 11 will be turned off, the spring body 1105 will return to its original position, and the platform body 301 will remain locked. The entire control process is connected by wires 12 to the button 4, the four spring magnetic attraction devices 11, and the battery body 13 respectively. In the normal locked state, the battery body 13 is not powered to ensure a long battery life. The rubber friction strip 1104 of the spring magnetic attraction device 11 should be made of high-friction rubber, and the coefficient of friction between it and the side wall of the moving slider mechanism 9 should be greater than 0.7. In the locked state, the gap between the embedded metal plate 1103 and the square electromagnet 1102 is less than 2. The ideal resolution is millimeters. Taking THK ball linear guide as an example, the slider and guide rail have a friction coefficient as low as 0.002. The extremely low friction coefficient makes the platform body 301 move more smoothly, the driving force required is smaller, and the positioning platform can bear a greater weight. The micrometer head body 5 is manually adjustable, and a button 4 is set to control two adjustment states, which is convenient for operators and is not sensitive to environmental temperature and other factors, making it suitable for a wider range of working scenarios. The micrometer-level input of the micrometer head body 5 is amplified several times to tens of times without loss by the flexible amplification mechanism, and the range can be amplified to the macro-micro level within the stress range. After being reduced several times to tens of times without loss by the flexible reduction mechanism, the output resolution of the positioning platform can reach the submicrometer to nanometer level.

[0029] In summary, this invention effectively solves the problems of poor positioning accuracy and poor end-efficiency stability of conventional manual positioning platforms by designing coarse and fine graded adjustment and end-efficiency locking in one-dimensional direction. It has the operation convenience of manual positioning platforms while abandoning the more complex control requirements and high cost of piezoelectric ceramic drive platforms. The output resolution of the fine adjustment process can reach the positioning accuracy of general piezoelectric ceramic drive platforms. At the same time, the application of the guide mechanism 10 enables the device to have a larger load capacity, lower requirements for working environment, and stronger adaptability.

[0030] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0031] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the invention as currently considered, or those features that are not relevant to implementing the invention) may be omitted.

[0032] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0033] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A manually operated micro-nano positioning platform capable of end locking, characterized in that: The utility model relates to a device shell mechanism (1), device shell mechanism (1) top is provided with the sealing cover (2), sealing cover (2) top is provided with the object platform mechanism (3), device shell mechanism (1) front right side is equipped with button (4), device shell mechanism (1) right side is provided with the micro differential head body (5), device shell mechanism (1) inner chamber bottom is provided with lower layer flexible amplification mechanism (6), device shell mechanism (1) inner chamber front side and rear side are provided with fixed sliding block mechanism (8), fixed sliding block mechanism (8) inboard is provided with guide mechanism (10), guide mechanism (10) top right side is provided with upper layer flexible amplification mechanism (7), guide mechanism (10) top left side is provided with mobile sliding block mechanism (9), guide mechanism (10) top and bottom front side and rear side are provided with spring magnetic attraction device (11), device shell mechanism (1) inner chamber front side and rear side are provided with wire (12), device shell mechanism (1) left side is provided with battery body (13), guide mechanism (10) top front side and rear side are provided with baffle (14). The device shell mechanism (1) includes a shell body (101), a battery mounting groove (102) is formed in the left side of the shell body (101), the inner cavity of the battery mounting groove (102) is mounted with the battery body (13), L-shaped mounting tables (103) are fixed on both sides of the inner cavity of the shell body (101), a first middle mounting table (104) is fixed in the inner cavity of the shell body (101), first side mounting tables (105) are fixed on the front end and the rear end of the inner cavity of the shell body (101), a lower mounting hole (106) is formed in the inner cavity of the shell body (101), and an upper mounting hole (107) is formed in the inner cavity of the shell body (101). 2.The manually micro-nano positioning platform with terminal locking according to claim 1, wherein: The object platform mechanism (3) includes a platform body (301), an installation part (302) is fixed to the right side of the bottom of the platform body (301), and the bottom of the installation part (302) is fixed to the top of the plane of the mobile sliding block mechanism (9). 3.The manually micro-nano positioning platform with terminal locking according to claim 2, wherein: The lower layer flexible amplification mechanism (6) includes a first displacement input end (601), first side fixed holes (602) are formed in the front side and the rear side of the first displacement input end (601), a first middle fixed hole (603) is formed in the center of the first displacement input end (601), and a first displacement output end (604) is fixed to the left side of the first displacement input end (601).

4. The manually lockable micro-nano positioning platform according to claim 3, wherein: The upper layer flexible amplification mechanism (7) includes a second displacement input end (701), second side fixed holes (702) are formed in the front side and the rear side of the second displacement input end (701), a second middle fixed hole (703) is formed in the center of the second displacement input end (701), and a second displacement output end (704) is fixed to the left side of the second displacement input end (701).

5. The manually lockable micro-nano positioning platform according to claim 4, wherein: ​ 6. The manually lockable micro-nano positioning platform according to claim 5, wherein: The fixed sliding block mechanism (8) comprises a fixed sliding block shell (801), a first guide rail groove (802) is arranged in the inner cavity of the fixed sliding block shell (801), and a first ball groove (803) is arranged in the inner cavity of the first guide rail groove (802).

7. The manually lockable micro-nano positioning platform according to claim 6, wherein: The moving sliding block mechanism (9) comprises a moving sliding block shell (901), an upper mounting table (902) is fixed to the top of the moving sliding block shell (901), a second guide rail groove (903) is arranged in the bottom of the moving sliding block shell (901), and a second ball groove (904) is arranged in the inner cavity of the second guide rail groove (903).

8. The manually lockable micro-nano positioning platform according to claim 7, wherein: The guide mechanism (10) comprises a second side mounting table (1002), an upper differential head mounting hole (1001) is arranged in the top of the second side mounting table (1002), a second middle mounting table (1003) is fixed to the second side mounting table (1002), a lower extension (1007) is fixed to the bottom of the second side mounting table (1002), a lower mounting table (1006) is fixed to the bottom of the lower extension (1007), a lower guide rail (1005) is fixed to the two sides of the lower extension (1007), and an upper guide rail (1004) is fixed to the top of the lower extension (1007).

9. The manually lockable micro-nano positioning platform according to claim 8, wherein: The spring magnetic attraction device (11) comprises a base (1101), a square electromagnet (1102) is fixed to the top of the base (1101), an embedded metal sheet (1103) is arranged at intervals on the top of the square electromagnet (1102), a rubber friction strip (1104) is arranged on the top of the embedded metal sheet (1103), spring bodies (1105) are fixed to the two sides of the base (1101), and the top end of the spring body (1105) is fixed to the bottom of the embedded metal sheet (1103).

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