A structure for increasing the positioning stroke of a giant magnetostrictive actuator

Abstract

The present invention discloses a structure for increasing the positioning stroke of a giant magnetostrictive actuator, which has the characteristics of large stroke and high precision. Under the macro-motion condition, the macro-motion coil of the structure is turned on, and interacts with the fixedly arranged arc-shaped permanent magnet through the magnetic field, driving all internal parts except the fixed parts such as the outer shell to move along the axial direction, thereby generating a macro-motion displacement. Under the micro-motion condition, the micro-motion coil of the structure is turned on to generate a magnetic field, so that the giant magnetostrictive material rod arranged on the central axis is deformed at the non-fixed front end under the action of the magnetic field, and the output rod is pushed to move along the axial direction, thereby generating a micro-motion displacement. The magnetic field mutual influence when the two coils are turned on is isolated by the magnetic isolation tube arranged between the macro-motion coil and the micro-motion coil. The advantages of the structure for increasing the positioning stroke of the giant magnetostrictive actuator of the present invention are: the overall structure is simple, the manufacturing is convenient, there is no Abbe error during measurement, and the positioning stroke of the giant magnetostrictive actuator is increased, so that it has the characteristics of large stroke and high precision.

Description

Technical Field

[0001] The invention relates to a precision drive device in the field of high-end manufacturing equipment, and more specifically to a structure for increasing the positioning stroke of a giant magnetostrictive drive. Background Art

[0002] Equipment manufacturing is a basic industry for economic and social development and an important cornerstone for improving comprehensive national strength. As the core power device of mechanical equipment, the performance of the driver is the key to ensuring the efficient operation of mechanical equipment. The giant magnetostrictive driver is a precision driver developed based on the magnetostrictive effect of giant magnetostrictive materials. It has the advantages of high positioning accuracy, large output force and strong stability. It has broad application prospects in the field of precision manufacturing, but its maximum positioning stroke can only reach the micron level, which seriously restricts its engineering application. Therefore, under the premise of ensuring its high positioning accuracy, designing a structure that can increase its positioning stroke is of great significance to expand its engineering application. Summary of the invention

[0003] The present invention mainly solves the problem of small positioning stroke of giant magnetostrictive actuator, and provides a structure for increasing its positioning stroke without losing its high positioning accuracy, while making the overall structure simple and easy to manufacture, and having the characteristics of large stroke and high accuracy.

[0004] The above technical problems of the present invention are mainly solved by the following technical solutions:

[0005] A structure for increasing the positioning stroke of a giant magnetostrictive actuator comprises a macro-dynamic outer yoke, a macro-dynamic coil frame, and a micro-dynamic coil frame, characterized in that: the front end of the macro-dynamic outer yoke is coaxially fixed with an outer bracket through an outer bracket fixing bolt group, the rear end is coaxially fixed with a macro-dynamic inner yoke through a macro-dynamic inner yoke fixing bolt group, six arc-shaped permanent magnets are evenly fixedly arranged on the inner side in a circumferential direction, the front end of the outer bracket is coaxially fixed with a front sliding bearing through a front bearing fixing bolt group, the rear end of the macro-dynamic inner yoke is coaxially fixed with a rear end cover through a rear end cover fixing bolt group, the rear end of the rear end cover is coaxially fixed with a rear sliding bearing through a rear bearing fixing bolt group, the rear end of the rear end cover is coaxially fixed with a rear sliding bearing through a rear bearing fixing bolt group, the rear sliding bearing is coaxially fixed with a rear push rod shaft through the rear sliding bearing, and the rear push rod shaft can slide axially along the rear sliding bearing.

[0006] A macro-dynamic coil is wound in the outer groove of the macro-dynamic coil frame, and is coaxially nested between the inner side of the macro-dynamic outer magnetic yoke and the outer side of the macro-dynamic inner magnetic yoke as a whole. A macro-micro connecting frame is coaxially fixedly arranged at the front end through a macro-micro connecting frame fixing bolt. The macro-micro connecting frame is arranged in the outer bracket, and an output sleeve is coaxially fixedly arranged at the front end through an output sleeve fixing bolt group, and a micro-dynamic yoke is coaxially fixedly arranged at the rear end through a micro-motion fixing bolt group. The front end of the output sleeve is coaxially penetrated and arranged in the front sliding bearing , and can slide axially along the front sliding bearing, the rear end of the micro-motion magnetic yoke is coaxially fixed with a magnetic isolation cylinder through the micro-motion fixing bolt group, a micro-motion magnetic yoke sleeve is coaxially nested in the magnetic isolation cylinder, and the whole is coaxially nested in the macro-motion inner magnetic yoke, and the rear end is abutted against the front end of the rear end cover and is axially penetrated by the front end of the rear push rod shaft, the front end of the micro-motion magnetic yoke sleeve is abutted against the micro-motion magnetic yoke, and the rear end is abutted against the inner side of the rear end of the magnetic isolation cylinder and is axially penetrated by the front end of the rear push rod shaft until it is flush with the inner side of the rear end.

[0007] A micro-motion coil is wound in the groove outside the micro-motion coil frame, and is coaxially nested in the micro-motion magnetic yoke sleeve as a whole. A magnetic conductive ring is coaxially fixedly arranged at the front end, and a GMM rod is arranged through the internal coaxial part. The GMM rod is made of giant magnetostrictive material and has a magnetostrictive effect. The front and rear ends of the GMM rod are respectively against the front and rear of the magnetic block group nested in the micro-motion coil frame. The magnetic block group consists of a front magnetic block and a rear magnetic block. An output rod is coaxially arranged at the front end of the front magnetic block. The rear end of the rear magnetic block is against the inner side of the micro-motion magnetic yoke sleeve and the front end of the rear push rod shaft. The output rod is provided with There is a cylindrical boss, and the part located at the front end of the cylindrical boss is coaxially penetrated in the micro-motion magnetic yoke, the macro-micro connecting frame and the output sleeve, and the part located at the rear end of the cylindrical boss is coaxially penetrated in the rear end of the magnetic conductive ring and the micro-motion coil frame, and its rear end is against the front end of the front magnetic block. The cylindrical boss is coaxially nested in the front end groove of the magnetic conductive ring and a disc spring is arranged at the front end. The disc spring is coaxially sleeved on the output rod and is tightly attached to the front end of the cylindrical boss and is arranged between the axial gap between the magnetic conductive ring and the micro-motion magnetic yoke.

[0008] The structure for increasing the positioning stroke of a giant magnetostrictive actuator of the present invention has the advantages of simple overall structure, convenient manufacturing, zero measurement Abbe error, and the characteristics of large stroke and high precision, and can solve the problem of small positioning stroke of the giant magnetostrictive actuator. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. It is obvious that the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0010] Figure 1 It is a plan view of a structure for increasing the positioning stroke of a giant magnetostrictive actuator according to the present invention;

[0011] Figure 2 It is a three-dimensional cross-sectional structural schematic diagram of a structure for increasing the positioning stroke of a giant magnetostrictive actuator according to the present invention;

[0012] Figure 3 for Figure 1 Schematic diagram of the three-dimensional structure of the output rod;

[0013] Figure 4 It is a schematic diagram of a three-dimensional cross-sectional structure of an initial state of a structure for increasing the positioning stroke of a giant magnetostrictive actuator according to the present invention;

[0014] Figure 5 It is a schematic diagram of a three-dimensional cross-sectional structure of a structure for increasing the positioning stroke of a giant magnetostrictive actuator in a macro-dynamic state according to the present invention;

[0015] Figure 6 It is a three-dimensional cross-sectional structural schematic diagram of a structure for increasing the positioning stroke of a giant magnetostrictive actuator according to the present invention, in a state of superposition of macro-motion and micro-motion;

[0016] 1. Rear push rod shaft; 2. Rear bearing fixing bolt group; 3. Rear sliding bearing; 4. Rear cover; 5. Rear cover fixing bolt group; 6. Macrodynamic inner yoke; 7. Macrodynamic inner yoke fixing bolt group; 8. Macrodynamic outer yoke; 9. Macrodynamic coil frame; 10. Macrodynamic coil; 11. Magnetic isolation cylinder; 12. Microdynamic yoke sleeve; 13. Magnetic block group; 14. Microdynamic coil; 15. Microdynamic coil frame; 16. GMM rod; 17. Arc permanent magnet; 18. External Bracket fixing bolt group; 19. External bracket; 20. Macro-micro connecting frame fixing bolt group; 21. Macro-micro connecting frame; 22. Micro-motion fixing bolt group; 23. Magnetic guide ring; 24. Disc spring; 25. Micro-motion magnetic yoke; 26. Output sleeve fixing bolt group; 27. Front bearing fixing bolt group; 28. Front sliding bearing; 29. ​​Output sleeve; 30. Output rod; 1301. Front magnetic guide block; 1302. Rear magnetic guide block; 3001. Cylindrical boss. DETAILED DESCRIPTION

[0017] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0018] The structure for increasing the positioning stroke of a giant magnetostrictive actuator of the present invention has the advantages of simple overall structure, convenient manufacturing, and zero measurement Abbe error. It also has the characteristics of large stroke and high precision, and can solve the problem of small positioning stroke of the giant magnetostrictive actuator.

[0019] like Figure 1 , Figure 2 As shown, a structure for increasing the positioning stroke of a giant magnetostrictive actuator comprises a macro-moving outer yoke 8, a macro-moving coil frame 9, and a micro-moving coil frame 15. The front end of the macro-moving outer yoke 8 is coaxially fixed with an outer bracket 19 through an outer bracket fixing bolt group 18, and the rear end is coaxially fixed with a macro-moving inner yoke 6 through a macro-moving inner yoke fixing bolt group 7. Six arc-shaped permanent magnets 17 are evenly fixedly arranged on the inner side in a circumferential direction. The front end of the outer bracket 19 is coaxially fixed with a front sliding bearing 28 through a front bearing fixing bolt group 27. The rear end of the macro-moving inner yoke 6 is coaxially fixed with a rear end cover 4 through a rear end cover fixing bolt group 5. The rear end of the rear end cover 4 is coaxially fixed with a rear sliding bearing 3 through a rear bearing fixing bolt group 2. The rear sliding bearing 3 is coaxially fixed with a rear push rod shaft 1, and the rear push rod shaft 1 can slide axially along the rear sliding bearing 3.

[0020] like Figure 1 , Figure 2 As shown, a macro-dynamic coil 10 is wound in the outer groove of the macro-dynamic coil frame 9, and is coaxially nested between the inner side of the macro-dynamic outer magnetic yoke 8 and the outer side of the macro-dynamic inner magnetic yoke 6. A macro-micro connecting frame 21 is coaxially fixedly arranged at the front end through a macro-micro connecting frame fixing bolt group 20. The macro-micro connecting frame 21 is arranged in the outer bracket 19, and an output sleeve 29 is coaxially fixedly arranged at the front end through an output sleeve fixing bolt group 26. A micro-dynamic yoke 25 is coaxially fixedly arranged at the rear end through a micro-dynamic fixing bolt group 22. The front end of the output sleeve 29 coaxially penetrates It is arranged in the front sliding bearing 28 and can slide axially along the front sliding bearing 28. A magnetic isolation cylinder 11 is coaxially fixedly arranged at the rear end of the micro-motion yoke 25 through the micro-motion fixing bolt group 22. A micro-motion yoke sleeve 12 is coaxially nested in the magnetic isolation cylinder 11, and the whole is coaxially nested in the macro-motion inner magnetic yoke 6, and the rear end is abutted against the front end of the rear end cover 4 and is axially penetrated by the front end of the rear push rod shaft 1. The front end of the micro-motion yoke sleeve 12 is abutted against the micro-motion yoke 25, and the rear end is abutted against the inner side of the rear end of the magnetic isolation cylinder 11 and is axially penetrated by the front end of the rear push rod shaft 1 until it is flush with the inner side of the rear end.

[0021] like Figure 1 , Figure 2 and Figure 3 As shown, a fine-motion coil 14 is wound in the outer groove of the fine-motion coil frame 15, and is coaxially nested in the fine-motion magnetic yoke sleeve 12 as a whole. A magnetic conductive ring 23 is coaxially fixedly arranged at the front end, and a GMM rod 16 is arranged through the inner coaxial part. The GMM rod 16 is made of giant magnetostrictive material and has a magnetostrictive effect. The front and rear ends of the GMM rod 16 are respectively against the front and rear of the magnetic conductive block group 13 nested in the fine-motion coil frame 15. The magnetic conductive block group 13 consists of a front magnetic conductive block 1301 and a rear magnetic conductive block 1302. An output rod 30 is coaxially arranged at the front end of the front magnetic conductive block 1301. The rear end of the rear magnetic conductive block 1302 is against the inner side of the fine-motion magnetic yoke sleeve 12 and the front end of the rear push rod shaft 1. A cylindrical boss 3001 is provided on the output rod 30, and the part located at the front end of the cylindrical boss 3001 is coaxially penetrated in the micro-motion yoke 25, the macro-micro connecting frame 21 and the output sleeve 29 in sequence, and the part located at the rear end of the cylindrical boss 3001 is coaxially penetrated in the rear end of the magnetic ring 23 and the micro-motion coil frame 15 in sequence, and its rear end is abutted against the front end of the front magnetic block 1301. The cylindrical boss 3001 is coaxially nested in the front end groove of the magnetic ring 23 and a disc spring 24 is arranged at the front end. The disc spring 24 is coaxially sleeved on the output rod 30 and is tightly attached to the front end of the cylindrical boss 3001 and is arranged between the axial gap between the magnetic ring 23 and the micro-motion yoke 25.

[0022] like Figure 4 , Figure 5 and Figure 6 As shown, the working process of a structure for increasing the positioning stroke of a giant magnetostrictive actuator is divided into two parts: macro-motion and micro-motion, which are described as follows:

[0023] Macro-dynamic part: The six arc-shaped permanent magnets 17 will generate a constant magnetic field B along the radial direction. Assuming the length of the macro-dynamic coil is L, when the current I is passed through the macro-dynamic coil 10 ma According to Ampere's law, the macro coil will be acted upon by Ampere's force F, whose magnitude is BI ma L, according to the left-hand rule, its direction is along the axial direction of the driver. Under the action of force F, the macro-motion coil frame 9 and all its internal components move along the axial direction with the macro-motion coil 10 to achieve macro-motion. By adjusting I ma The magnitude and direction of the value can control the magnitude and direction of the force F. According to Newton's second law F=ma, the magnitude of the acceleration and deceleration of the load can be further controlled, thereby controlling the movement distance of the load. ma The size, direction and duration of the value control the macro displacement value.

[0024] Micro-motion part: Current I is passed through the micro-motion coil 14 mi, the micro-motion coil 14 will form an energized solenoid, generating an axial magnetic field H inside it. Since the GMM rod 16 has a magnetostrictive effect, under the action of the magnetic field strength H, the GMM rod 16 will stretch and deform, pushing the rear magnetic block 1302 and the output rod 30 to compress the disc spring 24, causing the output rod 30 to generate an output displacement, thus achieving micro-motion. Therefore, by adjusting I mi The value controls the size of the generated magnetic field H, thereby adjusting the elongation of the GMM rod 16 and controlling the displacement value of the micro-motion.

[0025] Therefore, by comprehensively regulating I ma and I mi The size and direction of the value make the giant magnetostrictive actuator have both large stroke and high precision.

[0026] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that are not conceived through creative work should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope defined in the claims.

Claims

1. A structure for increasing the positioning stroke of a giant magnetostrictive actuator, comprising a macro-moving outer magnetic yoke (8), a macro-moving coil frame (9), and a micro-moving coil frame (15), characterized in that: The front end of the macro-dynamic outer magnetic yoke (8) is coaxially fixed with an outer bracket (19) through an outer bracket fixing bolt group (18), and the rear end is coaxially fixed with a macro-dynamic inner magnetic yoke (6) through a macro-dynamic inner magnetic yoke fixing bolt group (7). Six arc-shaped permanent magnets (17) are evenly fixedly arranged on the inner side in a circumferential direction. The front end of the outer bracket (19) is coaxially fixed with a front sliding bearing (28) through a front bearing fixing bolt group (27). The rear end of the macro-dynamic inner magnetic yoke (6) is coaxially fixed with a rear end cover (4) through a rear end cover fixing bolt group (5). The rear end of the rear end cover (4) is coaxially fixed with a rear sliding bearing (3) through a rear bearing fixing bolt group (2). The rear end of the rear sliding bearing (3) is coaxially fixed with a rear push rod shaft (1), and the rear push rod shaft (1) can slide axially along the rear sliding bearing (3). A macro-dynamic coil (10) is wound in the outer groove of the macro-dynamic coil frame (9), and is coaxially nested between the inner side of the macro-dynamic outer magnetic yoke (8) and the outer side of the macro-dynamic inner magnetic yoke (6). A macro-micro connection frame (21) is coaxially fixedly arranged at the front end through a macro-micro connection frame fixing bolt group (20). The macro-micro connection frame (21) is arranged in the outer bracket (19), and an output sleeve (29) is coaxially fixedly arranged at the front end through an output sleeve fixing bolt group (26). A micro-dynamic yoke (25) is coaxially fixedly arranged at the rear end through a micro-motion fixing bolt group (22). The front end of the output sleeve (29) is coaxially penetrated and arranged in the front sliding bearing (2 8), and can slide axially along the front sliding bearing (28), the rear end of the micro-motion magnetic yoke (25) is coaxially fixedly arranged with a magnetic isolation cylinder (11) through the micro-motion fixing bolt group (22), the micro-motion magnetic yoke sleeve (12) is coaxially nested in the magnetic isolation cylinder (11), and the whole is coaxially nested in the macro-motion inner magnetic yoke (6), and the rear end is against the front end of the rear end cover (4) and is axially penetrated by the front end of the rear push rod shaft (1), the front end of the micro-motion magnetic yoke sleeve (12) is against the micro-motion magnetic yoke (25), the rear end is against the inner side of the rear end of the magnetic isolation cylinder (11) and is axially penetrated by the front end of the rear push rod shaft (1) until it is flush with the inner side of the rear end; A micro-motion coil (14) is wound in a groove outside the micro-motion coil frame (15), and is coaxially nested in the micro-motion magnetic yoke sleeve (12) as a whole. A magnetic conductive ring (23) is coaxially fixedly arranged at the front end. A GMM rod (16) is arranged through the coaxial part inside. The GMM rod (16) is made of giant magnetostrictive material and has a magnetostrictive effect. Its front and rear ends are respectively against the front and rear of a magnetic conductive block group (13) nested in the micro-motion coil frame (15). The magnetic conductive block group (13) is composed of a front magnetic conductive block (1301) and a rear magnetic conductive block (1302). An output rod (30) is coaxially arranged at the front end of the front magnetic conductive block (1301). The rear end of the rear magnetic conductive block (1302) is against the inner side of the micro-motion magnetic yoke sleeve (12) and the front end of the rear push rod shaft (1). The output rod (30) is provided with A cylindrical boss (3001), and the portion located at the front end of the cylindrical boss (3001) is coaxially penetrated in the micro-motion yoke (25), the macro-micro connecting frame (21) and the output sleeve (29) in sequence, and the portion located at the rear end of the cylindrical boss (3001) is coaxially penetrated in the rear end of the magnetic conductive ring (23) and the micro-motion coil frame (15) in sequence, and the rear end thereof abuts against the front end of the front magnetic conductive block (1301), the cylindrical boss (3001) is coaxially nested in the front end groove of the magnetic conductive ring (23) and a disc spring (24) is arranged at the front end, the disc spring (24) is coaxially sleeved on the output rod (30) and is tightly attached to the front end of the cylindrical boss (3001) and is arranged between the axial gap between the magnetic conductive ring (23) and the micro-motion yoke (25).

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