A three-axis inertia switch based on a precision machining process and a machining method thereof

Abstract

A three-axis inertia switch based on a precision machining process and a machining method thereof, from top to bottom, an upper cover plate, an electrode unit and an induction unit are sequentially arranged; a buffer body is arranged at the center position of the bottom of the upper cover plate; the electrode unit comprises an integrated plate, an axial electrode embedded in the middle of the integrated plate, and a plurality of radial electrodes uniformly distributed along the center of the axial electrode in the circumferential direction below the integrated plate; the induction unit comprises an annular support seat and a mass electrode at the center position of the annular support seat, and a plurality of arc-shaped cantilever beams surrounding the mass electrode are arranged at the outer side of the mass electrode in the circumferential direction. Through the above technical scheme, on the one hand, flexible contact is generated between the mass electrode and the axial electrode and the radial electrode, which can improve the contact time and reduce the difficulty of signal capture; on the other hand, the structural characteristics of the axial electrode and the radial electrode limit the maximum deformation that can occur in the switch, thereby improving the high overload resistance of the three-axis inertia switch.

Description

Technical Field

[0001] This invention belongs to the field of inertial switch technology, specifically relating to a three-axis inertial switch based on precision machining technology and its machining method. Background Technology

[0002] An inertial switch is a precision device that combines a sensor and an actuator. Its working principle is as follows: the inertial switch senses changes in acceleration signals. When the acceleration reaches a certain threshold, its internal movable electrode moves towards a fixed electrode and forms contact. The electrical signal generated by this closed loop drives the system to perform a predetermined action. Because of its well-defined operating principle, simple structure, and ease of integration, inertial switches are widely used in aerospace, automotive, and ammunition fuse fields.

[0003] Patent CN101789329A discloses a three-dimensional, multi-directional sensitive micromechanical inertial electrical switch. Based on MEMS fabrication technology, its core structure is as follows: four horizontally fixed electrodes are evenly arranged radially on the outer side of a mass block; a through hole with one horizontally fixed electrode is located in the center of the mass block along the axial direction; and an axial electrode is spaced apart along the axial direction of the mass block. This invention solves the technical problem of inertial switches sensing multi-directional acceleration. However, the contact stiffness between the mass block and the electrodes remains high. On the one hand, this results in a short contact time between the mass block and the electrodes, making it difficult for the inertial switch to capture signals, thus reducing the accuracy and reliability of the inertial switch. On the other hand, the high stiffness of the mass block and electrodes inevitably leads to a "contact bounce" effect during collisions, causing damage to the electrode surface and affecting the overall service life of the inertial switch.

[0004] Patent CN103151220A discloses a microelectromechanical universal inertial switch with a long contact time and its manufacturing method. This invention, based on MEMS fabrication technology, features a ring-shaped mass frame embedded within a ring-shaped outer electrode. The ring-shaped mass frame is elastically connected to an anchor point at its center via several horizontal springs, and the ring-shaped outer electrode is elastically connected to the outer anchor area via several horizontal springs. When the external acceleration exceeds a threshold, the two movable electrodes (ring-shaped mass frame and ring-shaped outer electrode) will move together after contact under inertia, i.e., flexible contact, increasing the contact time between the electrodes and reducing the difficulty of capturing the switch signal. However, this invention lacks overload protection measures. When the acceleration is too high, firstly, the springs deform excessively, causing irreversible plastic deformation and rendering the springs elastic; secondly, the impact load between the ring-shaped mass frame and the ring-shaped outer electrode is too large, damaging the components. Furthermore, this invention is not sensitive to axial acceleration.

[0005] Based on the above, the following technical problems exist in the prior art:

[0006] (1) Excessive contact stiffness between the mass block electrodes results in a short contact response time, which is not conducive to the capture of inertial switch signals, thus affecting the accuracy and reliability of the inertial switch. In addition, excessive contact stiffness causes "contact bounce" between the mass block and the electrodes, reducing the stability of switch closure.

[0007] (2) The inertial switch lacks overload resistance. Excessive acceleration will cause the spring to fail, and the impact load of the mass block on the electrode will be too large, causing damage to the electrode or other internal components of the inertial switch.

[0008] (3) When the mass block electrode is suspended and there is no external force, the micro springs around the mass block electrode provide support for the mass block electrode to balance its own weight. However, if the gravity load is applied for too long, it will affect the performance of the micro springs to a certain extent, thereby affecting the sensitivity of the triaxial switch. Summary of the Invention

[0009] In view of this, the present invention aims to provide a triaxial inertial switch based on precision machining technology and its machining method, so as to solve the problems of excessive contact stiffness between the mass block and the electrode and the lack of overload resistance of the inertial switch in the prior art.

[0010] To achieve the above objectives, the present invention provides the following technical solution:

[0011] A triaxial inertial switch based on precision machining and its machining method are disclosed. The switch comprises an upper cover plate, an electrode unit, and a sensing unit arranged sequentially from top to bottom. A buffer body is provided at the center of the bottom of the upper cover plate, and the bottom of the buffer body is convex. The electrode unit includes an integrated plate, an axial electrode embedded in the middle of the integrated plate, and multiple radial electrodes evenly distributed circumferentially along the center of the axial electrode below the integrated plate. The axial electrode is convex, and the curvature of the convex surface of the axial electrode is greater than the curvature of the convex surface of the bottom of the buffer body. The sensing unit includes an annular support base and a mass block electrode located at the center of the annular support base. The mass block electrode and the annular support base are elastically connected by multiple micro-springs evenly distributed circumferentially. The top of the mass block is arc-shaped and the curvature of the arc-shaped protrusion is greater than the curvature of the bottom surface of the axial electrode. Multiple arc-shaped cantilever beams are arranged circumferentially around the mass block electrode on the outer side of the mass block electrode. A gap is left between the arc-shaped cantilever beams and the mass block electrode. The free end of the arc-shaped cantilever beam is directly opposite the inner surface of the radial electrode.

[0012] The beneficial effects of this invention are as follows:

[0013] 1. Compared with the prior art, a buffer body is provided at the bottom of the upper cover plate, and the top of the mass block electrode and the axial electrode are set as arc-shaped protrusions. On the one hand, it can make flexible contact between the mass block electrode and the axial electrode, thereby increasing the contact time and reducing the difficulty of signal acquisition. On the other hand, the axial electrode is a deformable structure. When the axial force is too large, the deformation of the axial electrode and the buffer body can offset the inertial load, preventing the electrode and mass block from plastic deformation due to large overload.

[0014] 2. Multiple arc-shaped cantilever beams are evenly arranged around the lower cylinder of the mass block electrode, and the inner surface of the radial electrode is set to be arc-shaped. Through the above improvements, firstly, flexible contact can be achieved between the mass block electrode and the radial electrode, increasing the contact time and facilitating signal capture; secondly, during the contact process between the mass block electrode and the radial electrode, the deformation of the arc-shaped cantilever beams offsets part of the inertial load, effectively preventing deformation and damage to the mass block electrode and the radial electrode due to overload. In addition, under the action of inertial load, the arc-shaped cantilever beams deform inward, and the lower cylinder of the mass block electrode can provide support for the arc-shaped cantilever beams, thereby preventing excessive deformation of the arc-shaped cantilever beams due to large overloads, which could cause damage and failure.

[0015] Furthermore, the buffer body includes a shell and a buffer material located inside the shell.

[0016] The beneficial effect is that the housing can effectively prevent the leakage of the cushioning material during the extrusion process, thereby affecting the triaxial inertial switch.

[0017] Furthermore, the axial electrode is composed of multiple sector-shaped blocks, which are distributed circumferentially with gaps between adjacent blocks.

[0018] The beneficial effect is that, under the action of inertial load, the deformation of each sector block is independent and unaffected by each other.

[0019] Furthermore, the arc-shaped cantilever beam includes an arc-shaped beam body and a fixed support for connecting the arc-shaped beam body and the mass block electrode. The end of the fixed support away from the mass block electrode is connected to two arc-shaped beam bodies, and the two arc-shaped beam bodies are symmetrically distributed about the fixed support as an axis of symmetry.

[0020] The beneficial effect is that the two arc-shaped beams are fixedly connected to a fixed support, which can reduce the number of fixed supports and thus help to reduce the complexity of the internal structure of the triaxial inertial switch.

[0021] Furthermore, the radial electrode is located between the mass block electrode and the annular support, and the radial electrode is located between two adjacent microsprings, with the inner surface of the radial electrode being arc-shaped.

[0022] Beneficial effect: The inner surface of the radial electrode is arc-shaped, which can increase the contact area between the radial electrode and the mass block electrode.

[0023] Furthermore, including the lower cover plate located below the sensing unit, when the triaxial inertial switch is used with the lower cover plate as the bottom, a first magnet is built into the bottom of the mass block electrode, and a second magnet is built into the top of the lower cover plate. The cross-section of the second magnet is larger than the cross-section of the first magnet, and the repulsive force generated by the second magnet and the first magnet is balanced by the gravity of the mass block electrode.

[0024] The beneficial effect is that the repulsive force between the magnets balances the gravity of the mass block electrode, preventing the microspring from deteriorating due to the continuous bearing of the mass block electrode's gravity.

[0025] Furthermore, an insulating gasket is provided between the integrated plate and the annular support base. The integrated plate has multiple limiting holes along the circumference, and the upper part of the insulating gasket has multiple limiting protrusions. The limiting protrusions correspond one-to-one with the limiting holes, and the center of the limiting protrusions has mounting holes.

[0026] The beneficial effect is that the limit port on the integrated board cooperates with the limit protrusion on the insulating pad to prevent the electrode unit from rotating during use.

[0027] Furthermore, the lower cover plate is provided with a plurality of limiting holes along the radial circumference for fixing the radial electrode. The size of the limiting holes is consistent with the cross-sectional size of the radial electrode and corresponds one-to-one. The radial electrode is inserted into the limiting holes.

[0028] Beneficial effect: By setting the limiting hole, the radial electrode load-bearing capacity can be increased.

[0029] Furthermore, a three-axis inertial switch based on precision machining technology and its machining method are characterized by comprising the following steps:

[0030] S1, the upper cover plate, the insulating gasket and the lower cover plate are made of insulating materials and processed by 3D printing technology.

[0031] S2, the electrode unit is made of conductive metal material and manufactured by ordinary machining.

[0032] S3, the sensing unit is made of conductive metal material. Given the different thicknesses of the mass block electrode, the micro spring and the annular support, firstly, the metal sheet is machined by milling to obtain the mass block electrode and the inner contour of the annular support; then, the micro spring and the arc-shaped cantilever beam are made by electrical discharge machining; finally, the overall outer contour of the sensing unit is cut out.

[0033] S4. All components are assembled by riveting to obtain a complete triaxial inertial switch.

[0034] The beneficial effects are achieved by using precision machining processes instead of MEMS technology, resulting in easier assembly, lower processing costs, and higher overall structural strength. Attached Figure Description

[0035] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the following figures are provided for illustration:

[0036] Figure 1 This is a schematic diagram of the overall structure of a three-axis inertial switch based on precision machining technology according to Embodiment 1 of the present invention, used to show the positional and connection relationships of all components.

[0037] Figure 2 This is an exploded view of a three-axis inertial switch based on precision machining technology according to Embodiment 1 of the present invention, used to show the shape and structure of each component.

[0038] Figure 3 This is a bottom view of the upper cover plate in Embodiment 1 of the present invention, used to show the shape and installation position of the buffer body.

[0039] Figure 4 for Figure 3 The AA-axis cross-sectional view is used to show the cross-sectional shape of the buffer body.

[0040] Figure 5 This is a schematic diagram of the electrode unit in Embodiment 1 of the present invention.

[0041] Figure 6 The top view of the electrode unit in Embodiment 1 of the present invention is used to show the structure and shape of the axial electrode.

[0042] Figure 7 This is a front view of the electrode unit in Embodiment 1 of the invention.

[0043] Figure 8 for Figure 7 The BB-axis sectional view shows the mounting positions of the axial and radial electrodes.

[0044] Figure 9 This is a schematic diagram of the insulating pad in Embodiment 1 of the invention.

[0045] Figure 10 This is a bottom view of the insulating pad in Embodiment 1 of the invention, used to show the distribution and shape of the limiting protrusions.

[0046] Figure 11 This is a schematic diagram of the overall structure of the sensing unit in Embodiment 1 of the invention.

[0047] Figure 12 This is a top view of the sensing unit in Embodiment 1 of the invention, used to show the structure and connection relationship of the mass block electrode, the micro spring and the annular support, especially the structure and position of the arc-shaped cantilever beam.

[0048] Figure 13 for Figure 7 The C-axis sectional view is used to show the positional relationship between the mass electrode, the microspring, and the annular support.

[0049] Figure 14 This is a bottom view of the sensing unit in Embodiment 1 of the invention, used to show the positional relationship and connection relationship between the first magnet and the mass block electrode.

[0050] Figure 15 This is a bottom view of the sensing unit in Embodiment 1 of the invention, used to show the shape and position of the second magnet and the limiting hole.

[0051] Figure 16 for Figure 15 The DD-direction sectional view shows the installation location of the second magnet.

[0052] The following components are labeled in the attached diagram: upper cover plate 1, buffer body 11, shell 111, buffer material 112, electrode unit 2, integrated plate 21, limiting opening 211, axial electrode 22, radial electrode 23, insulating gasket 3, limiting protrusion 31, sensing unit 4, mass block electrode 41, arc-shaped cantilever beam 411, beam body 4111, fixed support 4112, first magnet 412, micro spring 42, annular support 43, circumferential protrusion 431, lower cover plate 5, second magnet 51, limiting hole 52, rivet 6. Detailed Implementation

[0053] Example 1, see details Figures 1-16

[0054] like Figure 1 , Figure 2 As shown, a triaxial inertial switch based on precision machining technology and its machining method include an upper cover plate 1 of equal diameter, an electrode unit 2, an insulating pad 3, a sensing unit 4 and a lower cover plate 5 arranged sequentially from top to bottom.

[0055] like Figure 3 As shown, the upper cover plate 1 has evenly distributed mounting holes along its circumference. A circular groove is located at the center of the bottom of the upper cover plate 1. A buffer body 11 of the same diameter is installed within the circular groove, and the buffer body 11 is inserted into and bonded to the circular groove of the upper cover plate 1. In this embodiment, the upper cover plate 1 is made of an insulating material (such as nylon). The buffer body 11 includes a shell 111 and a buffer material 112 filled inside the shell. The shell 111 can be made of butadiene rubber, and the buffer material 112 can be made of foamed polyethylene. Figure 4 As shown, the top of the housing 111 is flat, and the bottom of the housing 111 is a convex curved surface, with a gap between the top and bottom of the housing 111. The buffer body 11 can provide a buffering effect on the deformation of the axial electrode 22 and can effectively prevent the axial electrode 22 from contacting the upper cover plate 1.

[0056] Electrode unit 2 includes, for example: Figure 5 The integrated plate 21, axial electrode 22, and radial electrode 23 shown are illustrated. The electrode unit 2 is made of a conductive metal (such as beryllium bronze). Figure 6 As shown, the integrated plate 21 has an opening in the middle, the diameter of which is the same as the diameter of the buffer body 11. Four fan-shaped annular limiting openings 211 are evenly distributed around the perimeter of the integrated plate 21. Figures 6-8 As shown, the axial electrode 22 is convex, and the curvature of the convex surface of the axial electrode 22 is greater than the curvature of the convex surface of the housing 111. It should be noted that in this embodiment, the axial electrode 22 is composed of four identical fan-shaped curved surface blocks. The thickness of the fan-shaped curved surface blocks is constant. The arc segment of the fan-shaped curved surface blocks is welded to the upper part of the opening sidewall of the integrated plate 21. A gap is left between the four fan-shaped curved surface blocks. By decomposing the axial electrode 22 into four sector-shaped curved blocks, firstly, the four sector-shaped curved blocks can deform under the impact of the mass block electrode 41, resulting in low contact stiffness and thus forming a flexible axial electrode 22; secondly, the deformation of the sector-shaped curved blocks can increase the contact time between the axial electrode 22 and the mass block electrode 41, improving the response effect, and the deformation of each sector-shaped curved block is independent and unaffected; thirdly, the axial electrode 22 can contact the buffer body 11 during deformation, and the buffer body 11 can transfer the force generated by inertia to the upper cover plate 1, avoiding plastic deformation of the axial electrode 22 due to excessive load.

[0057] The radial electrode 23 has a fan-shaped cross-section. In this embodiment, four radial electrodes 23 are evenly arranged along the opening of the integrated plate 21. Figure 8 As shown, the upper end of the radial electrode 23 is welded to the lower part of the opening sidewall of the integrated plate 21. By setting the radial electrode 23 in a fan-shaped manner, the contact area between the mass electrode 41 and the radial electrode 23 can be increased, thereby improving the sensitivity.

[0058] Insulating gasket 3 is as follows Figure 9 As shown, the upper surface of the annular insulating pad 3 has four fan-shaped openings along the circumference. Four limiting protrusions 31 are formed between these openings. The size of each limiting protrusion 31 is the same as the size of the limiting opening 211, and each limiting protrusion 31 has a mounting hole in its center. Furthermore, in this embodiment, the insulating pad is made of nylon. The interaction between the limiting protrusions 31 and the limiting openings 211 effectively prevents relative rotation between the electrode unit 2 and the insulating pad 3 during use.

[0059] like Figures 11-13 As shown, the sensing unit 4 includes a mass electrode 41, microsprings 42, and an annular support 43 arranged sequentially from the inside out. The sensing unit 4 is made of conductive metal (such as beryllium bronze). It should be noted that in this embodiment, in order to improve space utilization and reduce spring stiffness, the microsprings 42 are S-shaped microsprings. The mass electrode 41 and the annular support 43 are elastically connected by four evenly distributed microsprings 42. The lower part of the mass electrode 41 is a cylinder, and the upper part connected to the lower cylinder is an arc-shaped protrusion. The curvature of the arc-shaped protrusion is greater than the curvature of the bottom surface of the axial electrode 22. To ensure that the mass electrode 41 is in a suspended state, the bottom of the mass electrode 41 is located inside the annular support 43.

[0060] In this embodiment, to prevent excessive contact stiffness between the mass electrode 41 and the radial electrode 23 during operation, a series of uniformly arranged ribs are provided around the lower cylinder of the mass electrode 41. Figure 12 The four pairs of curved cantilever beams 411 shown above include, for example, the curved cantilever beams 411 as shown above. Figure 12 The beam 4111 and fixed support 4112 shown are provided. One end of the fixed support 4112 is welded to the mass block electrode 41 along the axial direction, and the beam 4111 is welded to the end of the fixed support 4112 away from the mass block electrode. It should be noted that in this embodiment, two beams 4111 are welded to the same fixed support 4112 along the circumferential direction, which constitutes a pair of arc-shaped cantilever beams 411. By setting the arc-shaped cantilever beam 411, on the one hand, the mass block electrode 41 is transformed from a rigid electrode to a flexible electrode, and the contact between the mass block electrode 41 and the radial electrode 23 is transformed from rigid contact to flexible contact. During the contact process, the arc-shaped cantilever beam 41 deforms to offset the force between the mass block electrode 41 and the radial electrode 23, which plays a buffering role, prolongs the contact time between the mass block electrode 41 and the radial electrode 23, reduces the difficulty of response recognition, and the contact time can be adjusted by changing the cantilever beam line width and the inner diameter of the cantilever beam root. On the other hand, under overload conditions, when the arc-shaped cantilever beam 411 is compressed to the point of maximum deformation, it comes into contact with the lower cylinder. The reaction force provided by the lower cylinder on the arc-shaped cantilever beam 411 can effectively prevent the arc-shaped cantilever beam 411 from being damaged or failing due to excessive deformation, that is, it has a self-limiting function.

[0061] In addition, the bottom of the mass block electrode 41 has an opening like... Figure 13 , Figure 14 The circular groove shown has a first magnet 412 (magnet) with the same size as the groove. The first magnet 412 is inserted into the circular groove at the bottom of the mass block electrode 41 and is bonded to the circular groove.

[0062] The annular support 43 is evenly provided with the following around its circumference: Figure 14The circumferential protrusion 431 shown is located between the micro-springs 4, and a mounting hole is opened in the middle of the circumferential protrusion 431.

[0063] The lower cover plate 5 is provided with a second magnet 51, a limiting hole 52 and a mounting hole in sequence from the inside to the outside, such as Figure 15 , Figure 16 As shown, a circular groove is formed at the center of the top of the lower cover plate 5. The size of the second magnet 51 (magnet) is the same as the size of the groove. The second magnet 51 is inserted into the circular groove of the lower cover plate 5 and glued in place. The cross-sectional area of ​​the second magnet 51 is larger than that of the first magnet 412. The repulsive force between the first magnet 412 at the bottom of the mass electrode 41 and the second magnet 51 at the top of the lower cover plate 5 counteracts the gravity of the mass electrode 41. This effectively prevents the microspring 42 from degrading due to bearing the gravity of the mass electrode 41 for a long time, thus avoiding affecting the sensitivity of the triaxial switch.

[0064] To ensure the integrity and sealing of the triaxial inertial switch, in this embodiment, rivets 6 are used to pass through the mounting holes inside the upper cover plate 1, insulating gasket 3, sensing unit 4 and lower cover plate 5 in sequence, and to press and fix the triaxial inertial switch.

[0065] The corresponding machining method for the aforementioned three-axis inertial switch based on precision machining technology is as follows:

[0066] S1, the upper cover plate 1, the insulating gasket 3 and the lower cover plate 5 are made of insulating materials (such as nylon, rubber, etc.) and are processed by 3D printing technology;

[0067] S2, electrode unit 2 is made of conductive metal material (such as beryllium bronze) and can be manufactured using ordinary machining processes (such as CNC machining).

[0068] S3, the sensing unit 441 is made of beryllium bronze plate, such as Figure 7 As shown, since the mass block electrode 41, micro spring 42 and annular support 43 have different thicknesses, the inner contours of the mass block electrode 41 and annular support 43 need to be milled on both sides of the metal sheet using milling technology. Then, the micro spring 42 and the arc cantilever beam 411 are processed using wire EDM. After the internal structure is processed, the overall outer contour is cut off from the sheet.

[0069] S4, the shell 111 of the buffer body 11 is made of butadiene rubber, the inside of the shell 111 is filled with buffer material 112 (foamed polyethylene), and the buffer body 11 is snapped into the circular groove of the upper cover plate 1 and glued.

[0070] S5, insert the first magnet 412 into the circular groove at the bottom of the mass block electrode 41 and glue it in place, and insert the second magnet 51 into the circular groove of the lower cover plate 5 and glue it in place.

[0071] S6, after all structural processing is completed, rivets 6 are used to assemble the components by passing through all the mounting holes.

[0072] This invention is applicable to precision machining processes, does not rely on MEMS processes, has low assembly difficulty, low processing cost, and high overall structural strength.

[0073] Finally, it should be noted that the above preferred 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 through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A three-axis inertial switch based on precision machining technology, characterized in that, The device includes, from top to bottom, an upper cover plate, an electrode unit, and a sensing unit. A buffer body is located at the center of the bottom of the upper cover plate, and the bottom of the buffer body convexes upwards. The electrode unit includes an integrated plate, an axial electrode embedded in the center of the integrated plate, and multiple radial electrodes evenly distributed circumferentially along the center of the axial electrode below the integrated plate. The axial electrode convexes upwards, and the curvature of its convex surface is greater than the curvature of the convex surface at the bottom of the buffer body. The sensing unit includes an annular support base and a mass electrode located at the center of the annular support base. The mass electrode and the annular support base are elastically connected by multiple circumferentially evenly distributed micro-springs. The mass block has an arc-shaped protrusion at its top, the curvature of which is greater than the curvature of the bottom surface of the axial electrode. Multiple arc-shaped cantilever beams are circumferentially spaced around the mass block electrode on its outer side, with gaps between the arc-shaped cantilever beams and the mass block electrode. The free ends of the arc-shaped cantilever beams face the inner surfaces of the radial electrodes. Each arc-shaped cantilever beam includes an arc-shaped beam body and a fixed support for connecting the arc-shaped beam body to the mass block electrode. Two arc-shaped beam bodies are connected to the end of the fixed support away from the mass block electrode, and the two arc-shaped beam bodies are symmetrically distributed about the fixed support as an axis of symmetry.

2. A three-axis inertial switch based on precision machining technology according to claim 1, characterized in that, The buffer body includes a shell and a buffer material located inside the shell.

3. A three-axis inertial switch based on precision machining technology according to claim 1, characterized in that, The axial electrode is composed of multiple sector-shaped blocks, which are distributed in a circular pattern with gaps between adjacent blocks.

4. A three-axis inertial switch based on precision machining technology according to claim 1, characterized in that, The radial electrode is located between the mass block electrode and the annular support, and the radial electrode is located between two adjacent microsprings. The inner surface of the radial electrode is arc-shaped.

5. A three-axis inertial switch based on precision machining technology according to claim 1, characterized in that, It also includes a lower cover plate located below the sensing unit. When the triaxial inertial switch is used with the lower cover plate as the bottom, a first magnet is built into the bottom of the mass block electrode, and a second magnet is built into the top of the lower cover plate. The cross-section of the second magnet is larger than the cross-section of the first magnet, and the repulsive force generated by the second magnet and the first magnet is balanced by the gravity of the mass block electrode.

6. A three-axis inertial switch based on precision machining technology according to claim 5, characterized in that, An insulating gasket is provided between the integrated plate and the annular support base. The integrated plate has multiple limiting holes along the circumference. The upper part of the insulating gasket has multiple limiting protrusions, and the limiting protrusions correspond one-to-one with the limiting holes. The center of the limiting protrusions has a mounting hole.

7. A three-axis inertial switch based on precision machining technology according to claim 6, characterized in that, The lower cover plate is provided with a plurality of limiting holes along the radial circumference for fixing radial electrodes. The size of the limiting holes is consistent with the cross-sectional size of the radial electrodes and corresponds one-to-one. The radial electrodes are inserted into the limiting holes.

8. The machining method for a three-axis inertial switch based on precision machining technology according to claim 7, characterized in that, Includes the following steps: S1, the upper cover plate, the insulating gasket, and the lower cover plate are made of insulating materials and processed using 3D printing technology; S2, the electrode unit is made of conductive metal material and manufactured by CNC machining; S3, the sensing unit is made of conductive metal material. Given the different thicknesses of the mass block electrode, the micro spring, and the annular support, firstly, the metal sheet is machined using a milling process to obtain the mass block electrode and the inner contour of the annular support; then, the micro spring and the arc-shaped cantilever beam are made using an electrical discharge machining process; finally, the overall outer contour of the sensing unit is cut out. S4. All components are assembled by riveting to obtain a complete triaxial inertial switch.

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