Amplitude closed-loop adjustable mechanical low-frequency vibration generation device

Abstract

The invention belongs to the field of processing equipment, and discloses an amplitude closed-loop adjustable mechanical low-frequency vibration generation device, which comprises a variable amplitude vibrator, a vibration feedback device, an amplitude adjusting device and a control end, and is characterized in that the variable amplitude vibrator comprises two groups of structures capable of generating same-frequency axial vibration; each group of vibration generation structure comprises a wave-shaped roller path, a rolling body and a plane roller path; the amplitude adjusting device changes the relative angle positions of the wave-shaped raceways of the two groups of axial vibration devices in the amplitude-variable vibrator in an electric driving manner, so that the phase difference of the two groups of axial vibration is changed, and the amplitude of the synthesized axial vibration is adjusted; the vibration feedback device can monitor the output amplitude of the variable-amplitude vibrator in real time and feed back the output amplitude to the control section, and closed-loop precise control over the output amplitude by the control section is achieved. According to the device, axial low-frequency vibration is overlaid while the main shaft does feeding motion, discontinuous cutting is achieved, and metal cuttings can be effectively broken off. And meanwhile, the vibration amplitude can be changed in the drilling process so as to meet various machining requirements.

Description

Technical Field

[0001] The present invention belongs to the field of processing equipment, and in particular relates to a mechanical low-frequency vibration generating device with adjustable amplitude closed loop. Background Art

[0002] High-end aerospace equipment makes extensive use of lightweight, high-strength carbon fiber reinforced composite materials. To ensure stable load-bearing at key connection points, metal materials such as high-strength titanium alloys and high-strength steel that are resistant to alternating loads are also used. This results in a large number of laminated structures made of composite materials and metals, requiring high-quality, high-precision hole making to meet the requirements of high-reliability assembly and safe service. High-strength metals such as titanium alloys and stainless steel are typically difficult-to-machine materials and are often processed using low-frequency vibration-assisted drilling. Different metal materials and processing parameters require different vibration amplitudes. When using low-frequency vibration-assisted drilling for carbon fiber composites, the additional vibration can easily cause delamination damage at the entrance and exit. Existing processing techniques either use low-frequency vibration throughout the entire process of integrated hole making in laminated materials, or no low-frequency vibration at all, making it difficult to take into account the different vibration requirements of the two materials. Therefore, a method or device is needed to control the amplitude of the auxiliary vibration during processing to achieve integrated, high-quality hole making that takes into account the processing status of multiple materials.

[0003] The French company MITIS invented a "Bearing with an axially movable ring and machining apparatus equipped with such a bearing," patented ZL200780029856.X. This structure employs a wave-shaped bearing raceway for the machine tool shank to generate axial periodic reciprocating motion during spindle rotation, causing the tool to generate axial low-frequency vibrations with adjustable amplitude. However, the amplitude cannot be adjusted during machining and its bulkiness precludes its application in assembly sites. Jiao Feng et al. from Henan Polytechnic University invented a "Mechanical Axial Low-Frequency Drilling Device," patented ZL201811303077.0. This device superimposes low-frequency vibrations axially through sinusoidal grooves in a sleeve. The amplitude can be varied by changing the grooves, allowing switching between zero-amplitude and non-zero-amplitude grooves. However, this method imposes low-frequency vibrations on the workpiece, making it difficult to use with large workpieces and presents certain limitations. Gao Shaowu and others from Jiangsu Jicui Precision Manufacturing Research Institute Co., Ltd. invented a lightweight automatic feed drilling device and its control method, with patent number: CN202311608343.1. The axial direction of its vibration unit is equipped with a stator, roller, cage and rotor in sequence, and a measuring needle is fixed on the cage and rotor. The angle difference between the corrugated surface and the cage can be obtained to judge the vibration state, but the amplitude cannot be adjusted, and it is difficult to adapt to various and complex hole-making conditions.

[0004] In summary, in order to meet the requirements of adjustable amplitude of vibration-assisted process for integrated high-quality hole making of laminated structures composed of composite materials and high-strength metal materials, it is necessary to invent a low-frequency vibration generating device with miniaturization, high degree of integration, good reliability and real-time adjustable amplitude to solve the problems of poor processing quality, low precision and severe tool wear in the hole making of laminated structures composed of high-strength metal materials and carbon fiber reinforced composite materials or other laminated structures. Summary of the Invention

[0005] To overcome the shortcomings of the existing technology, the present invention invents a mechanical low-frequency vibration generation device that can precisely adjust the amplitude in a closed loop during the machining process. The device is equipped with two sets of structures that can generate axial vibrations of the same frequency. The control end drives the phase adjustment plate through a linear motor to change the phase difference between the two sets of axial vibrations, thereby changing the output amplitude. The control end then monitors the output amplitude of the variable amplitude vibrator in real time through a vibration feedback device to achieve closed-loop precise control of the output amplitude. The device can change the low-frequency vibration amplitude during the integrated hole-making and drilling process of laminated structures composed of composite materials and high-strength metal materials or other laminated structures, effectively improving the machining quality. In addition, the device can also be used in other scenarios where vibration generation is required.

[0006] The technical solution of the present invention:

[0007] A mechanical low-frequency vibration generating device with adjustable amplitude closed loop, comprising a variable amplitude vibrator 1, a vibration feedback device 2, an amplitude adjustment device 3 and a control terminal 4;

[0008] The variable amplitude vibrator 1 includes an upper axial vibration structure and a lower axial vibration structure that can generate the same frequency, as well as other parts; the upper axial vibration structure includes a gasket A106, a roller A107, a retainer A108 and a wavy raceway A109; the lower axial vibration structure includes a gasket B115, a roller B113, a retainer B114 and a wavy raceway B112; other parts include a pre-tightening bolt 101, a disc spring assembly 102, a female connection end 103, a sealing ring A104, a positioning ball A105, a retainer synchronizer ring 110, a bearing 111, Positioning ball B116, sealing ring B117, key 118 and male connection end 119; disc spring assembly 102 is composed of multiple disc springs; the cross section of the female connection end 103 is a T-shaped central axis platform structure, the end of the central axis is provided with a number of evenly distributed first semi-cylindrical grooves 103A, the lower surface of the platform is provided with a number of evenly distributed first hemispherical grooves 103B, the upper surface of the platform is provided with a concave platform positioning surface 103C and a first connecting thread 103D, and the outer edge of the platform is provided with a first sealing groove 103E; gasket A106 and gasket B There are several hemispherical grooves on the non-raceway side plane of 115; the inner rings of the retainer A108 and the retainer B114 are both provided with arc grooves; both ends of the retainer synchronizer ring 110 are provided with arc teeth; the inner concave side of the wavy raceway A109 and the inner concave side of the wavy raceway B112 are respectively provided with a first wavy structure surface 109A and a second wavy structure surface 112A, and the outer side of the wavy raceway A109 and the outer side of the wavy raceway B112 are respectively provided with a pin 109B and a pin 112B, the first wavy structure surface 109A and the second The wavy structural surface 112A has the same number of sinusoidal periods as the number of rollers; the interface of the male connecting end 119 is a stepped cylindrical platform structure, the cylindrical end of which is a second connecting thread 119D, the end of the second connecting thread 119D is a boss positioning surface 119C, and the end of the boss positioning surface 119C is a wrench buckle 119F. The outer edge surface of the platform is provided with a second second sealing groove 119E, and the upper surface of the platform is provided with a plurality of evenly distributed second semi-cylindrical grooves 119A and a plurality of evenly distributed third hemispherical grooves 119B;

[0009] The vibration feedback device 2 includes a bolt C201, a bolt D202, a sensor 203 (used to detect the output amplitude of the variable amplitude vibrator 1 as a whole, which can be an acceleration sensor or a displacement sensor without limitation to the specific type), a support column A204 and a support column B205;

[0010] The amplitude adjustment device 3 includes a phase adjustment plate 301, bolt A302, a linear motor 303, a motor mounting base 304, bolt B305, a connecting pin 306, a bearing A307, an adapter block 308, a bearing B309, and an end fastening bolt 310. 301 is provided with two cylindrical pins 301C, a slide A301A, and a slide B301B. The linear motor 303 includes a motor rod 303A and a motor body 303B.

[0011] The control terminal 4 is an integrated circuit board having communication lines with the linear motor and the sensor 202;

[0012] The bolt 101 passes through the disc spring group 102, the female connection end 103 and the male connection end 119 in sequence; the first sealing groove 103E of the female connection end 103 and the second sealing groove 119E of the male connection end 119 are used to place the sealing ring A104 and the sealing ring B117 respectively to achieve sealing; the central axis of the female connection end 103 passes through the gasket A106, the retainer A108, the wavy raceway A109, the retainer synchronizer ring 110, the bearing 111, the wavy raceway B112, the retainer B114 and the gasket B115 in sequence, and the hemispherical groove of the gasket A106 is placed in a one-to-one correspondence with the first hemispherical groove 103B of the female connection end 103 to form a spherical groove, and the positioning ball A105 is placed in the formed spherical groove; the rollers 107 are placed in a one-to-one correspondence in the holes of the retainer A108, and the first wavy structural surface 109A of the wavy raceway A109 and the gasket A106 serve as the roller A115. The raceway 107, the bearing 111 is placed between the wavy raceway A109 and the wavy raceway B112, the rollers 113 are placed in the holes of the retainer B114 in a one-to-one correspondence, the second wavy structure surface 112A of the wavy raceway B112 and the gasket B115 serve as the raceway for the roller B113, the hemispherical groove of the gasket B115 corresponds one-to-one with the second hemispherical groove 109B of the male connection end 119 to form a spherical groove, and the positioning ball B116 is placed in the formed spherical groove; a plurality of keys 118 are respectively placed in the first semi-cylindrical groove 103 of the female connection end 103 A is in a cylindrical groove formed by a one-to-one correspondence with the second semi-cylindrical groove 119A of the male connecting end 119; the arc teeth at both ends of the retainer synchronizer ring 110 are respectively inserted into the arc grooves of the retainer A108 and the retainer B114; the concave positioning surface 103C and the first connecting thread 103D of the female connecting end 103 and the convex positioning surface 119C and the second connecting thread 119D of the male connecting end 119 are used to connect with external devices; the connecting pin 306 passes through the bearing A307, The adapter block 308 and the bearing B309 are connected to the end fastening bolt 310. The bolts C201 and D202 pass through the sensor 203 and are connected to the support column A204 and the support column B205 respectively. The support columns A204 and B205 are connected to the adapter block 308. The variable amplitude vibrator 1 is connected to the connecting pin 306 through the concave positioning surface 103C and the first connecting thread 103D. The two bolts pass through the two through holes of the motor fixing seat 304 and the adapter block 308. Connection, bolt 305 passes through the through hole of the motor body 303B and is connected to the adapter block 308, bolt A302 passes through the through hole at the front end of the motor rod 303A and is connected to the phase adjustment plate 301, and the two cylindrical pins 301C of the phase adjustment plate 301 are inserted into the corresponding holes of the adapter block 308; the pin 112B of the wavy raceway B112 and the pin 109B of the wavy raceway A109 are respectively placed in the slide groove 1 301A and the slide groove 2 301B of the phase adjustment plate 301.

[0013] Furthermore, the wavy raceway A109 and the wavy raceway B112 contain the same number of sinusoidal curve periods, the peak-to-peak values of the sinusoidal curves are the same or different, and the number of rollers A107 and rollers B113 is the same.

[0014] Furthermore, the arc teeth at both ends of the holder synchronization ring 110 are respectively inserted into the arc grooves of the retainer A108 and the retainer B114, ensuring that the roller A107 of the upper axial vibration structure and the roller B113 of the lower axial vibration structure are in the same phase.

[0015] Furthermore, the motor rod 303A of the linear motor 303 can move axially back and forth relative to the adapter block 308, driving the phase adjustment plate 301 to move axially back and forth relative to the adapter block 308. The pin 109B of the wavy roller A109 and the pin 112B of the wavy roller B112 are respectively placed in the slide groove 1 301A and the slide groove 2 301B of the phase adjustment plate 301, and the axial movement relative to the adapter block 308 is ignored. When the phase adjustment plate 301 moves axially back and forth, the pin 109B and the pin 112B slide in the slide groove, causing the wavy roller A109 and the wavy roller B112 to shift in phase, thereby changing the output amplitude of 1.

[0016] Furthermore, the sensor 203 is used to obtain the axial vibration of the variable amplitude vibrator 1 in real time and feed it back to the control terminal 4 .

[0017] Furthermore, the control terminal 4 can control the amplitude output of the variable amplitude vibrator 1 by controlling the extension length of the motor rod 303A, and can also realize real-time perception of the output vibration of the variable amplitude vibrator 1 through the sensor 203, thereby realizing precise closed-loop feedback control of the variable amplitude vibrator 1.

[0018] Furthermore, the phase adjustment plate 301 has a plurality of sliding grooves. When the pins slide in the sliding grooves respectively, the devices connected to the pins will generate relative rotation in the circumferential direction.

[0019] Beneficial effects of the present invention: The present invention provides a mechanical low-frequency vibration generating device with adjustable closed-loop amplitude. The device is provided with two groups of phase-adjustable same-frequency axial vibration generating structures. The control end drives the phase adjustment plate through the motor to change the phase difference between the two groups of axial vibrations, thereby changing the output amplitude; the control end monitors the output amplitude of the variable amplitude vibrator in real time through the vibration feedback device to achieve closed-loop precise control of the output amplitude. The device can change the low-frequency vibration amplitude during the integrated hole-making and drilling process of the laminated structure composed of composite materials and high-strength metal materials, which can more effectively reduce the damage of metal chip breaking to the composite hole wall, thereby improving the processing quality and reducing tool wear. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1Schematic diagram of an explosion of the mechanical low-frequency vibration generating device with adjustable amplitude according to the present invention;

[0021] Figure 2 This is a structural diagram of the amplitude-adjustable mechanical low-frequency vibration generating device of the present invention;

[0022] Figure 3 is a cross-sectional view of the variable amplitude vibrator of the present invention;

[0023] Figure 4 An exploded view of the variable amplitude vibrator in the present invention;

[0024] Figure 5 This is a structural diagram of the female connection end in the present invention;

[0025] Figure 6 This is a structural diagram of the male connection end of the present invention;

[0026] Figure 7 This is a structural diagram of the wavy raceway A in the present invention;

[0027] Figure 8 This is a structural diagram of the wavy raceway B in the present invention;

[0028] Figure 9 is a structural diagram of the phase adjustment plate in the present invention;

[0029] Figure 10 1 is a structural diagram of the linear motor in the present invention;

[0030] Figure 11 This is a structural diagram of gasket A / B in the present invention;

[0031] Figure 12 : is a structural diagram of the retainer A / B in the present invention;

[0032] Figure 13 It is a structural diagram of the retainer synchronizer ring in the present invention.

[0033] In the figure: 1 variable amplitude vibrator, 2 vibration feedback device, 3 amplitude adjustment device, 4 control end, 101 pre-tightening bolt, 102 disc spring group, 103 female connection end, 104 sealing ring A, 105 positioning ball A, 106 gasket A, 107 roller A, 108 cage A, 109 wavy raceway A, 110 cage synchronizer ring, 111 bearing, 112 wavy raceway B, 113 roller B, 114 cage B, 115 gasket B, 116 positioning ball B, 117 sealing ring B, 118 key, 119 male connection end, 103A first semi-cylindrical groove, 103 first hemispherical groove, 103C concave platform positioning surface, 103D first connecting thread, 103E first sealing groove, 109A first wavy structural surface, 1 09B second hemispherical groove, 112A second wavy structural surface, 112B pin, 119A second semi-cylindrical groove, 119B third hemispherical groove, 119C boss positioning surface, 119D second connecting thread, 119E second sealing groove, 119F wrench buckle, 201 bolt C, 202 bolt D, 203 sensor, 204 support column A, 205 support column B, 301 phase adjustment plate, 302 bolt A, 303 linear motor, 304 motor fixing seat, 305 bolt B, 306 connecting pin, 307 bearing A, 308 adapter block, 309 bearing B, 310 end fastening bolt, 301A slide groove one, 301B slide groove two, 301C cylindrical pin, 303A motor rod, 303B motor. DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below through specific embodiments with reference to the accompanying drawings.

[0035] Example 1

[0036] Reference to the accompanying drawings of the invention Figures 1 to 13 , a mechanical low-frequency vibration generating device with adjustable closed-loop amplitude, comprising:

[0037] like Figure 1 and Figure 2 The device is a mechanical low-frequency vibration generator with adjustable amplitude closed loop, comprising a variable amplitude vibrator 1, a vibration feedback device 2, an amplitude adjustment device 3, and a control terminal 4;

[0038] The variable amplitude vibrator 1 includes a pre-tightening bolt 101, a disc spring assembly 102, a female connection end 103, a sealing ring A104, a positioning ball A105, a gasket A106, a roller A107, a retainer A108, a wavy raceway A109, a retainer synchronizer ring 110, a bearing 111, a wavy raceway B112, a roller B113, a retainer B114, a gasket B115, a positioning ball B116, a sealing ring B117, a key 118, and a male connection end 119.

[0039] The vibration feedback device 2 includes a bolt C201, a bolt D202, a sensor 203, a support column A204, and a support column B205;

[0040] The amplitude adjustment device 3 includes a phase adjustment plate 301 , a bolt A 302 , a linear motor 303 , a motor fixing seat 304 , a bolt B 305 , a connecting pin 306 , a bearing A 307 , an adapter block 308 , a bearing B 309 , and an end fastening bolt 310 .

[0041] In this embodiment, the bolt 101 passes through the disc spring group 102, the female connection end 103 and the male connection end 119 in sequence, and can press other parts between the female connection end 103 and the male connection end 119, and the pressing force can be adjusted by adjusting the pre-compression distance of the disc spring group 102; the first sealing groove 103E of the female connection end 103 and the second sealing groove 119E of the male connection end 119 are used to place the sealing ring A104 and the sealing ring B117 for sealing to prevent the lubricating oil / grease from flowing out; the central axis of the female connection end 103 passes through the gasket A106, the retaining frame A108, the wavy raceway A109, the retaining frame synchronizer ring 110, the bearing 111, the wavy roller The hemispherical groove of the gasket A106 is placed in a one-to-one correspondence with the first hemispherical groove 103B of the female connecting end 103, and the positioning ball A105 is placed in the formed spherical groove to ensure that the gasket A106 and the female connecting end 103 rotate synchronously; the rollers 107 are placed in a one-to-one correspondence in the holes of the retainer A108, the first wavy structural surface 109A of the wavy raceway A109 and the gasket A106 serve as the raceways of the rollers 107, the bearing 111 is placed between the wavy raceway A109 and the wavy raceway B112, the rollers 113 are placed in a one-to-one correspondence in the holes of the retainer B114, and the wavy raceway B1 The second wavy structural surface 112A of 12 and the gasket B115 serve as the raceway for the roller B113. The hemispherical groove of the gasket B115 corresponds one-to-one with the second hemispherical groove 109B of the male connecting end 119 to form a spherical groove. The positioning ball B116 is placed in the formed spherical groove to ensure that the gasket B115 and the male connecting end 119 rotate synchronously. A plurality of keys 118 are respectively placed in the cylindrical grooves formed by the first semi-cylindrical groove 103A of the female connecting end 103 and the second semi-cylindrical groove 119A of the male connecting end 119 to transmit torque and ensure that the female connecting end 103 and the male connecting end 119 rotate synchronously. The arc teeth at both ends of the retainer synchronizer ring 110 are divided into Insert them into the arc grooves of retainer A108 and retainer B114 respectively to ensure that roller 107 and roller 113 are always in the same phase; the concave positioning surface 103C and the first connecting thread 103D of the female connecting end 103 and the convex positioning surface 119C and the second connecting thread 119D of the male connecting end 119 can be positioned and connected with an external device; the connecting pin 306 passes through the bearing A307, the adapter block 308, and the bearing B309 in sequence and is connected to the end fastening bolt 310, the bolt C201 and the bolt D202 pass through the sensor 203 and are connected to the support column A204 and the support column B205 respectively, and the support column A204 and the support column B205 are connected to the adapter block 308;The variable amplitude vibrator 1 is positioned and connected to the connecting pin 306 through the concave positioning surface 103C and the first connecting thread 103D. Two bolts pass through the two through holes of the motor fixing seat 304 and are connected to the adapter block 308. The bolt 305 passes through the through hole of the motor body 303B and is connected to the adapter block 308. The bolt A302 passes through the through hole at the front end of the motor rod 303A and is connected to the phase adjustment plate 301. The two cylindrical pins 301C of the phase adjustment plate 301 are inserted into the corresponding holes of the adapter block 308. The pin 112B of the wavy raceway B 112 and the pin 109B of the wavy raceway A 109 are placed in the first slide 301A and the second slide 301B of the phase adjustment plate 301, respectively. When the motor rod 303A drives the phase adjustment plate 301 to move axially, the pin 112B and the pin 109B can slide along the slide 301A and the second slide 301B, respectively, and respectively drive the wavy raceway B 112 and the wavy raceway A 109 to rotate and generate a phase difference.

[0042] When in use, the male connection end 119 is connected to the adapter block 308, and the female connection end 103 is connected to the main shaft or other devices that need to output vibration (not shown in the figure) through the concave positioning surface 103C and the first connecting thread 103D. The pin 112B and the pin 109B can be in the slide groove 1 301A and the slide groove 2 301B respectively, so the wavy raceway B112 and the wavy raceway A109 cannot rotate along their own axes. When the gasket B115 and the gasket A106 rotate along their own axes, the roller B113 and the roller A107 roll on the wavy raceway B112 and the wavy raceway A109 respectively, and the gasket B115 and the gasket A106 will generate axial vibration (axial periodic distance change) relative to the wavy raceway B112 and the wavy raceway A109 respectively. The frequencies of the two vibrations are the same, and the frequency depends on the first wavy structure. The number of sinusoidal curves on surface 109A and the rotation frequency of gasket B115 relative to the wavy roller B112, the amplitudes of the two vibrations are respectively equal to the amplitudes of the sinusoidal curves on the first wavy structural surface 109A and the second wavy structural surface 112A; when the output amplitude needs to be adjusted, the control end 4 controls the motor rod 303A to drive the phase adjustment plate 301 to axially move to a certain approximate position, and the pin 112B and the pin 109B slide along the slide groove 1 301A and the slide groove 2 301B to the corresponding positions respectively. At this time, the phase difference between the wavy roller B112 and the wavy roller A109 changes, and the overall output amplitude changes accordingly. The control end 4 obtains the difference between the overall output amplitude and the desired amplitude through the sensor 203, and can continue to adjust the axial movement distance of the motor rod 303A to make the overall amplitude accurately approach the desired amplitude.

[0043] During operation, the male connection end 119 is connected to the adapter block 308, and the female connection end 103 is connected to the main shaft or other devices that need to output vibration through the concave positioning surface 103C and the first connecting thread 103D. The pin 112B and the pin 109B can be in the slide groove 1 301A and the slide groove 2 301B respectively. In the initial state, the phase difference between the wavy roller B112 and the wavy roller A109 is 0 (180°). At this time, the amplitude of the output of the variable amplitude vibrator 1 is the largest (smallest). When the motor rod 303A is extended, the amplitude of the output of the variable amplitude vibrator 1 will gradually become the smallest (largest) with the extension distance, that is, starting from the initial position, the motor rod 303A can make the output amplitude of the variable amplitude vibrator 1 change from the largest (smallest) to the smallest (largest) during the unidirectional movement; before the formal work, the extension distance of the motor rod 303A and the output amplitude of the variable amplitude vibrator 1 will be calibrated; at a certain moment in the processing, the output amplitude of the variable amplitude vibrator 1 is A0 and needs to be adjusted to A1. At this time, the control section 4 controls the motor rod 303A to extend the corresponding distance according to the calibration data, and obtains the output amplitude of the variable amplitude vibrator 1 in real time through the sensor 202 and continuously adjusts the extension distance of the motor rod 303A, so that the phase difference between the wavy roller B112 and the wavy roller A109 is changed from 0. achieve ,at this time , that is, under this phase difference, the amplitude of the two sets of axial vibrations after superposition is exactly ( is the amplitude of the upper axial vibration structure, is the amplitude of the lower axial vibration structure, and They are usually equal, but may not be equal).

[0044] In this embodiment, the first wavy structural surface 109A and the second wavy structural surface 112A both have a five-cycle annular sine curve. During low-frequency vibration, the main shaft vibrates 2.5 times in the axial direction per one rotation. The number and amplitude of axial vibrations per one rotation of the main shaft can be adjusted by varying the frequency of the axial vibration and the number of cycles and amplitude of the annular sine curves of the wavy structural surface.

Claims

1. A mechanical low-frequency vibration generating device with adjustable closed-loop amplitude, characterized in that: The closed-loop amplitude-adjustable mechanical low-frequency vibration generating device comprises a variable-amplitude vibrator (1), a vibration feedback device (2), an amplitude adjustment device (3), and a control terminal (4); The variable amplitude vibrator (1) includes an upper axial vibration structure and a lower axial vibration structure capable of generating the same frequency, and other parts; the upper axial vibration structure includes a gasket A (106), a roller A (107), a retainer A (108) and a wavy raceway A (109); the lower axial vibration structure includes a gasket B (115), a roller B (113), a retainer B (114) and a wavy raceway B (112); the other parts include a pre-tightening bolt (101), a disc spring assembly (102), a female connection end (103), a sealing ring A (104), a positioning ball A (105), a retainer synchronizing ring (110), a shaft The disc spring assembly (102) is composed of a plurality of disc springs; the cross section of the female connection end (103) is a T-shaped central axis platform structure, wherein the end of the central axis is provided with a plurality of evenly distributed first semi-cylindrical grooves (103A), the lower surface of the platform is provided with a plurality of evenly distributed first hemispherical grooves (103B), the upper surface of the platform is provided with a concave platform positioning surface (103C) and a first connecting thread (103D), and the outer edge surface of the platform is provided with a first sealing groove (103E); the gasket A (10 6) and the non-rolling side plane of the gasket B (115) are provided with a plurality of hemispherical grooves; the inner rings of the retainer A (108) and the retainer B (114) are provided with arc grooves; both ends of the retainer synchronization ring (110) are provided with arc teeth; the inner concave side of the wavy raceway A (109) and the inner concave side of the wavy raceway B (112) are provided with a first wavy structure surface (109A) and a second wavy structure surface (112A) respectively, the outer side of the wavy raceway A (109) and the outer side of the wavy raceway B (112) are provided with a pin (109B) and a pin (112B) respectively, the first wavy structure surface (1 09A) and the second wavy structural surface (112A) have the same number of sinusoidal periods, and are the same as the number of rollers; the interface of the male connecting end (119) is a cylindrical platform structure with a stepped structure, the cylindrical end of which is a second connecting thread (119D), the end of the second connecting thread (119D) is a boss positioning surface (119C), the end of the boss positioning surface (119C) is a wrench buckle (119F), the outer edge surface of the platform is provided with a second sealing groove (119E), and the upper surface of the platform is provided with a plurality of evenly distributed second semi-cylindrical grooves (119A) and a plurality of evenly distributed third hemispherical grooves (119B); The vibration feedback device 2 includes a bolt C (201), a bolt D (202), a sensor (203), a support column A (204) and a support column B (205); The amplitude adjustment device 3 includes a phase adjustment plate (301), a bolt A (302), a linear motor (303), a motor fixing seat (304), a bolt B (305), a connecting pin (306), a bearing A (307), a transfer block (308), a bearing B (309) and an end fastening bolt (310); (301) is provided with two cylindrical pins (301C), a slide groove A (301A) and a slide groove B (301B); the linear motor (303) includes a motor rod (303A) and a motor body (303B); The control end (4) is an integrated circuit board having a communication line with the linear motor and the sensor (202); The bolt (101) passes through the disc spring assembly (102), the female connection end (103) and the male connection end (119) in sequence; the first sealing groove (103E) of the female connection end (103) and the second sealing groove (119E) of the male connection end (119) are respectively used to place the sealing ring A (104) and the sealing ring B (117) to achieve sealing; the central axis of the female connection end (103) passes through the gasket A (106), the retainer A (108), the wavy raceway A (117) and the retainer B (117) in sequence. (109), retainer synchronizing ring (110), bearing (111), wavy raceway B (112), retainer B (114) and gasket B (115), the hemispherical groove of gasket A (106) and the first hemispherical groove (103B) of the female connecting end (103) are placed one by one to form a spherical groove, and the positioning ball A (105) is placed in the formed spherical groove; the rollers (107) are placed one by one in the holes of retainer A (108), the first wavy structural surface (109A) of the wavy raceway A (109) and gasket A (106) serve as the raceway of the roller A (107), and the bearing (111) is placed on the wavy raceway A (109) and the wavy raceway B (112), the rollers (113) are placed in the holes of the retainer B (114) in a one-to-one correspondence, the second wavy structure surface (112A) of the wavy raceway B (112) and the gasket B (115) serve as the raceway of the rollers B (113), the hemispherical groove of the gasket B (115) corresponds to the second hemispherical groove (109B) of the male connection end (119) in a one-to-one correspondence to form a spherical groove, and the positioning ball B (116) is placed in the formed spherical groove; a plurality of keys (118) are respectively placed in the cylindrical grooves formed by the first semi-cylindrical groove (103A) of the female connection end (103) and the second semi-cylindrical groove (119A) of the male connection end (119) in a one-to-one correspondence; the arc teeth at both ends of the retainer synchronization ring (110) are respectively inserted into the cylindrical grooves formed by the first semi-cylindrical groove (103A) of the female connection end (103) and the second semi-cylindrical groove (119A) of the male connection end (119); the arc teeth at both ends of the retainer synchronization ring (110) are respectively inserted into the cylindrical grooves formed by the first semi-cylindrical groove (103A) of the female connection end (103) and the second semi-cylindrical groove (119A) of the male connection end (119). Inserted into the arc groove of the retainer A (108) and the retainer B (114); the concave positioning surface (103C) and the first connecting thread (103D) of the female connecting end (103) and the convex positioning surface (119C) and the second connecting thread (119D) of the male connecting end (119) are used to connect with an external device; the connecting pin (306) passes through the bearing A (307), the adapter block (308), and the bearing B (309) in sequence and is connected to the end fastening bolt (310); the bolt C (201) and the bolt D (202) pass through the sensor (203) and are connected to the support column A (204) and the support column B (205) respectively; the support column A (204) and the support column B (205) are connected to the adapter block (308);The variable amplitude vibrator (1) is connected to the connecting pin (306) through the concave platform positioning surface (103C) and the first connecting thread (103D); two bolts pass through the two through holes of the motor fixing seat (304) and are connected to the adapter block (308); a bolt (305) passes through the through hole of the motor body (303B) and is connected to the adapter block (308); a bolt A (302) passes through the front through hole of the motor rod (303A) and is connected to the phase adjustment plate (301); two cylindrical pins (301C) of the phase adjustment plate (301) are inserted into the corresponding holes of the adapter block (308); the pin (112B) of the wavy roller B (112) and the pin (109B) of the wavy roller A (109) are respectively placed in the first slide groove (301A) and the second slide groove (301B) of the phase adjustment plate (301).

2. The mechanical low-frequency vibration generating device with adjustable closed-loop amplitude according to claim 1, characterized in that: The wavy roller A (109) and the wavy roller B (112) have the same number of sinusoidal curve cycles, the same or different peak-to-peak values of the sinusoidal curves, and the same number of rollers A (107) and rollers B (113).

3. The mechanical low-frequency vibration generating device with adjustable closed-loop amplitude according to claim 1 or 2, characterized in that: The arc teeth at both ends of the holder synchronization ring (110) are respectively inserted into the arc grooves of the holder A (108) and the holder B (114), ensuring that the roller A (107) of the upper axial vibration structure and the roller B (113) of the lower axial vibration structure are in the same phase.

4. The mechanical low-frequency vibration generating device with adjustable closed-loop amplitude according to claim 1 or 2, characterized in that: The motor rod (303A) of the linear motor (303) can move forward and backward in the axial direction relative to the adapter block (308), driving the phase adjustment plate (301) to move forward and backward in the axial direction relative to the adapter block (308). The pin (109B) of the wavy roller A (109) and the pin (112B) of the wavy roller B (112) are respectively placed in the first slide groove (301A) and the second slide groove (301B) of the phase adjustment plate (301) and the axial movement relative to the adapter block (308) is ignored. When the phase adjustment plate (301) moves forward and backward in the axial direction, the pin (109B) and the pin (112B) slide in the slide groove, causing the wavy roller A (109) and the wavy roller B (112) to shift in phase, thereby changing the output amplitude of (1).

5. The mechanical low-frequency vibration generating device with adjustable closed-loop amplitude according to claim 1 or 2, characterized in that: The sensor (203) is used to obtain the axial vibration condition of the variable amplitude vibrator (1) in real time and feed it back to the control end (4).

6. The mechanical low-frequency vibration generating device with adjustable closed-loop amplitude according to claim 1 or 2, characterized in that: The control end (4) can control the amplitude output of the variable amplitude vibrator (1) by controlling the extension length of the motor rod (303A), and can also realize real-time perception of the output vibration of the variable amplitude vibrator (1) through the sensor (203), thereby realizing closed-loop feedback and precise control of the variable amplitude vibrator (1).

7. The mechanical low-frequency vibration generating device with adjustable closed-loop amplitude according to claim 1, characterized in that: The phase adjustment plate (301) has a plurality of sliding grooves. When the pins slide in the sliding grooves respectively, the devices connected to the pins will generate relative rotation in the circumferential direction.

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