Adjustable permanent magnet damper

Abstract

The utility model discloses an adjustable permanent magnet damper, and belongs to the technical field of permanent magnet brakes, and the permanent magnet damper comprises a housing, main shafts which are respectively fixed at two ends of the housing, and main shafts which are rotatably connected in the housing and on two end covers and penetrate through the two end covers; the magnetic piece is arranged in the shell, corresponds to the outer side of the main shaft and is used for generating a magnetic field; the sliding sleeve axially moves in the shell; the magnetic sleeve is fixedly arranged on the inner side of the sliding sleeve and located on one side of the outer portions of the multiple magnetic parts, and the adjusting assembly is arranged on the shell and the end cover, connected with the sliding sleeve and used for driving the sliding sleeve to move and adjusting the length of the magnetic sleeve covering the outer sides of the magnetic parts. According to the adjustable permanent magnet damper, the position of the sliding sleeve is changed through the adjusting assembly, and then the length of the part, covering the outer side of the magnetic piece, of the magnetic sleeve is adjusted, so that stepless adjustment from the minimum damping torque to the maximum damping torque can be achieved, and various requirements for torque under different working conditions are met.

Description

Technical Field

[0001] This application relates to the field of permanent magnet brake technology, specifically an adjustable permanent magnet damper. Background Technology

[0002] In many process industries, such as yarn manufacturing, steel wire processing, and wire and cable production, the stable operation of equipment and product quality control highly depend on precise adjustment of process parameters. Among these, the brake, as a core actuator, functions to provide controllable and constant torque output to accurately control key parameters such as tension and speed of the workpiece. Under such conditions, permanent magnet brakes, with their unique advantages, are often chosen as the key source of unwinding tension in the workpiece. Simultaneously, in testing applications such as motor testing, the requirement for constant torque loads also makes permanent magnet brakes an indispensable testing device.

[0003] However, traditional axial flux brakes are quite common. One type consists of a kinematic pair of two opposing rotating magnetic material disks, where torque is controlled by adjusting the disk gap. However, in this structure, the magnetic flux direction is axial. When a higher torque is desired, the amount of axial magnetic material must be increased. The magnetic material extending outwards from the shaft center generates less torque in the central portion, resulting in material waste. Furthermore, although the torque is proportional to the disk gap, the control is non-linear, making precise adjustment difficult and leading to uncontrollability.

[0004] Another type of axial flux brake consists of two fixed joints and one rotating joint. It controls the magnetic flux and thus adjusts the torque by adjusting the relative angle between the magnetic poles of the two fixed joints. However, although its torque is proportional to the angle difference between the fixed joints, it is also a non-linear control, and the adjustment accuracy is difficult to guarantee.

[0005] In addition, the above-mentioned traditional brakes often require tools or measuring instruments for adjustment, which is cumbersome and usually requires the operator to work with both hands, or even multiple people to complete the adjustment, making them extremely inconvenient to use.

[0006] Therefore, this application provides an adjustable permanent magnet damper to solve the above problems. Utility Model Content

[0007] This application provides an adjustable permanent magnet damper, which aims to solve the problems mentioned in the background art of existing traditional axial flux brakes, such as material waste, nonlinear torque control leading to uncontrollable adjustment, low adjustment accuracy, and cumbersome and inconvenient operation.

[0008] To achieve the above objectives, this application provides the following technical solution: an adjustable permanent magnet damper, comprising a housing, a main shaft respectively fixed at both ends of the housing, and a main shaft rotatably connected to the housing and the two end caps and passing through the two end caps;

[0009] The permanent magnet damper also includes a magnetic component disposed inside the housing corresponding to the outside of the main shaft for generating a magnetic field, a sliding sleeve that moves axially inside the housing, a magnetic sleeve fixedly disposed inside the sliding sleeve and located on one side outside the plurality of magnetic components, and an adjustment assembly disposed on the housing and end cap and connected to the sliding sleeve for driving the sliding sleeve to move and adjusting the length of the magnetic sleeve covering the outside of the magnetic component.

[0010] The housing is made of aluminum alloy, while the main shaft and sliding sleeve are made of stainless steel. The magnetic component is made of neodymium iron boron or samarium cobalt, and the magnetic sleeve is made of hysteresis material, specifically unmagnetized aluminum nickel cobalt, iron chromium cobalt, or iron cobalt vanadium alloy. By adjusting the position of the sliding sleeve using the adjusting assembly, the length of the magnetic sleeve covering the outer side of the magnetic component can be adjusted. Since the axial coverage lengths of the magnetic sleeve and the magnetic component are proportional, stepless adjustment of the damping torque from minimum to maximum can be achieved to meet diverse torque requirements under different operating conditions. Furthermore, the use of neodymium iron boron or samarium cobalt for the magnetic component, which possesses strong magnetism and effectively generates an alternating magnetic field, and the magnetic sleeve using hysteresis material, specifically unmagnetized aluminum nickel cobalt, iron chromium cobalt, or iron cobalt vanadium alloy, provides a unique and effective torque adjustment mechanism. The material itself possesses suitable hysteresis characteristics, enabling it to effectively generate hysteresis loss in the alternating magnetic field produced by the magnetic components, thereby stably generating damping torque. The magnetic components and the magnetic sleeve work together to enable the adjustable permanent magnet damper to adopt a radial magnetic circuit structure. Compared with traditional axial magnetic flux brakes, it reduces the amount of magnetic material used while producing the same torque, improving material utilization and saving costs. Furthermore, the design of the adjustment component eliminates the need for additional complex tools or multiple people to work together; the operator can operate it with one hand, making it convenient and quick. In addition, the main shaft and sliding sleeve are made of stainless steel, which has good corrosion resistance; the housing is made of aluminum alloy, which has good thermal conductivity, thus balancing the dimensional changes after the temperature rise and ensuring stable operation of the damper.

[0011] Preferably, to ensure smooth relative rotation between the magnetic sleeve and the magnetic component and to effectively generate hysteresis loss, a magnetic air gap is provided between the magnetic sleeve and the magnetic component. The magnetic air gap is 0.2~2mm, the coercivity of the material used in the magnetic sleeve is less than that of the material used in the magnetic component, the thickness of the magnetic sleeve is 1.0~5mm, and the thickness of the magnetic component 3 is 2~5mm. The design of the magnetic air gap allows the magnetic sleeve to rotate freely in the alternating magnetic field generated by the magnetic component, reducing friction and wear, ensuring the stable generation of hysteresis loss, and thus ensuring the stable output of damping torque. The value of the magnetic air gap is 0.2~2mm, which can balance the magnetic flux density. The design incorporates factors such as the degree of precision, ease of machining, and reliability to ensure stable damper performance. The coercivity of the material used in the magnetic sleeve is lower than that of the material used in the magnetic components. This design allows the magnetic domains in the magnetic sleeve to more easily flip in the alternating magnetic field generated by the magnetic components, effectively generating hysteresis loss and thus stably producing damping torque. This ensures that the damper can output a stable braking torque under various operating conditions. The thickness of the magnetic components ranges from 2 to 5 mm, while the thickness of the magnetic sleeve ranges from 1.0 to 5 mm. Appropriate thicknesses ensure that the magnetic components generate a sufficiently strong and uniform alternating magnetic field, while also enabling the magnetic sleeve to effectively respond to changes in the magnetic field and generate appropriate hysteresis loss.

[0012] Preferably, in order to facilitate the generation of a magnetic field, the magnetic component is a plurality of magnetic strips arranged in an N-S interval or a magnetic ring magnetized by radial multipole; the design of a plurality of magnetic strips arranged in an N-S interval or a magnetic ring magnetized by radial multipole can provide different magnetic field generation methods, meet different design and application requirements, and increase the diversity and flexibility of damper design.

[0013] Preferably, to facilitate adjustment of the length of the magnetic sleeve covering the magnetic component, the adjustment assembly includes a screw rotatably connected inside the housing and on the two end caps and passing through the other end cap, and a driving component disposed on the outside of the other end cap for driving the screw to rotate. The screw is screwed to the outer side of the sliding sleeve. By screwing the screw to the sliding sleeve, the operator only needs to operate the driving component to convert the rotation of the screw into the axial displacement of the sliding sleeve, thereby adjusting the length of the magnetic sleeve covering the magnetic component and thus adjusting the damping torque.

[0014] Preferably, to facilitate operation of the adjustment component, the driving component includes a nut disposed outside the two end caps and fixedly connected to the end of the screw; by setting the driving component as a nut, the operator can easily adjust the rotation of the screw by rotating the nut, thereby adjusting the position of the magnetic sleeve, which is simple and intuitive to operate and requires no additional power equipment.

[0015] Preferably, to facilitate precise adjustment by the operator, the sliding sleeve and the housing are equipped with an indicator component for indicating the adjustment length of the magnetic sleeve. The design of the indicator component can intuitively display the adjustment length of the magnetic sleeve, allowing the operator to intuitively and clearly obtain the specific value of the adjustment length of the magnetic sleeve, thereby achieving precise adjustment of the damping torque and improving the accuracy and efficiency of the adjustment.

[0016] Preferably, to facilitate a direct and intuitive presentation of the magnetic sleeve adjustment length, the indicating component includes a pointer that passes through the housing and is fixedly connected to the side of the sliding sleeve away from the screw, a through hole on the housing corresponding to the pointer position, and a scale on one side of the through hole. The end of the pointer away from the sliding sleeve is slidably connected in the through hole. As the pointer slides in the through hole and cooperates with the scale, the operator can intuitively obtain information about the magnetic sleeve adjustment length simply by observing the position of the pointer on the scale, without the need for complex calculations or additional measurements, greatly reducing the difficulty of operation.

[0017] Preferably, in order to achieve electrified adjustment, the driving component includes a motor fixedly installed outside the two end caps and fixedly connected to the end of the screw; by using a motor as the driving component, the rotation of the screw can be precisely controlled by an electrical control system, which makes the adjustment process of the damper electrified, which is convenient for integration with automated production systems and enables remote or automatic control.

[0018] Preferably, to meet the needs of different application scenarios, the adjustment component includes a servo electric cylinder or pneumatic cylinder fixedly installed outside another end cover, and the piston rod of the servo electric cylinder or pneumatic cylinder is fixedly connected to the outer side of the sliding sleeve; by using a servo electric cylinder or pneumatic cylinder as the adjustment component, the linear drive of the servo electric cylinder or pneumatic cylinder is used to replace the screw and nut, resulting in a faster response speed and the ability to complete the axial position adjustment of the sliding sleeve in a short time, which can quickly adapt to changes in working conditions and meet the needs of different application scenarios.

[0019] Preferably, to facilitate flexible adjustment according to specific working conditions and increase the flexibility of damper design, multiple magnetic components are fixedly disposed inside the sliding sleeve, and the magnetic sleeve is fixedly disposed outside the main shaft. Since different working conditions have different requirements for the relative positions of the magnetic components and the magnetic sleeve, the positions of the magnetic components and the magnetic sleeve can be interchanged to change the magnetic circuit structure and the way the magnetic field interacts, so that the damper can be flexibly adjusted according to specific working conditions.

[0020] This adjustable permanent magnet damper changes the position of the sliding sleeve by adjusting the component, thereby adjusting the length of the magnetic sleeve covering the outside of the magnetic component. Since the axial coverage length of the magnetic sleeve and the magnetic component is proportional, stepless adjustment of the damping torque from minimum to maximum can be achieved to meet the diverse torque requirements under different working conditions.

[0021] This adjustable permanent magnet damper uses neodymium iron boron material for its magnetic components. This material has strong magnetism and can effectively generate an alternating magnetic field. The magnetic sleeve uses hysteresis material. The two work together to make the adjustable permanent magnet damper adopt a radial magnetic circuit structure. Compared with the traditional axial magnetic flux brake, it reduces the amount of magnetic material used, improves material utilization, and saves costs while producing the same torque.

[0022] This adjustable permanent magnet damper, through the design of the adjustment component, can be operated by a single hand without the need for additional complex tools or multiple people working together, making it convenient and quick to operate;

[0023] This adjustable permanent magnet damper uses a motor as the driving component, and the rotation of the screw can be precisely controlled by an electrical control system. This makes the damper adjustment process electrified, which is convenient for integration with automated production systems to achieve remote or automatic control.

[0024] This adjustable permanent magnet damper uses a servo electric cylinder or a pneumatic cylinder as the adjustment component. It uses the linear drive of the servo electric cylinder or pneumatic cylinder to replace the screw and nut, which has a faster response speed and can complete the axial position adjustment of the sliding sleeve in a short time. It can quickly adapt to changes in working conditions and meet the needs of different application scenarios.

[0025] This adjustable permanent magnet damper interchanges the positions of the magnetic components and the magnetic sleeve, which can change the magnetic circuit structure and the way the magnetic field interacts, allowing the damper to be flexibly adjusted according to specific working conditions. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of an adjustable permanent magnet damper in Example 1;

[0027] Figure 2 This is a schematic diagram of the structure of an adjustable permanent magnet damper in Example 1 after the magnetic sleeve is adjusted.

[0028] Figure 3 This is a schematic diagram of the structure of the magnetic component in Example 1, which is a combination of multiple magnetic strips;

[0029] Figure 4 This is a schematic diagram of the structure of the radially multipole magnetized magnetic ring in Example 1;

[0030] Figure 5 This is a schematic diagram of the drive component in Example 2;

[0031] Figure 6 This is a schematic diagram of the adjustment component in Example 3;

[0032] Figure 7 This is a schematic diagram of an adjustable permanent magnet damper in Example 4.

[0033] In the picture:

[0034] 1. Shell; 11. End cap;

[0035] 2. Spindle;

[0036] 3. Magnetic components;

[0037] 4. Sliding sleeve;

[0038] 5. Magnetic sleeve;

[0039] 6. Adjustment component; 61. Screw; 62. Drive component;

[0040] 7. Magnetic air gap;

[0041] 8. Indicator component; 81. Pointer; 82. Through hole; Detailed Implementation

[0042] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0043] Example 1

[0044] This embodiment provides an adjustable permanent magnet damper, such as... Figures 1-4 As shown, the permanent magnet damper includes a housing 1, a main shaft 2 fixed at both ends of the housing 1, and the main shaft 2 rotatably connected to the housing 1 and the two end caps 11 and passing through the two end caps 11. The permanent magnet damper also includes a magnetic component 3 disposed inside the housing 1 corresponding to the outside of the main shaft 2 for generating a magnetic field, a sliding sleeve 4 that moves axially inside the housing 1, a magnetic sleeve 5 fixedly disposed inside the sliding sleeve 4 and located on one side outside the multiple magnetic components 3, and an adjustment component 6 disposed on the housing 1 and the end caps 11 and connected to the sliding sleeve 4 for driving the sliding sleeve 4 to move and adjusting the length of the magnetic sleeve 5 covering the outside of the magnetic component 3. The housing 1 is made of aluminum alloy, the main shaft 2 and the sliding sleeve 4 are both made of stainless steel, the magnetic component 3 is made of neodymium iron boron or samarium cobalt, and the magnetic sleeve 5 is made of hysteresis material, which is unmagnetized aluminum nickel cobalt or iron chromium cobalt or iron cobalt vanadium alloy.

[0045] To ensure smooth relative rotation between the magnetic sleeve 5 and the magnetic component 3 and to effectively generate hysteresis loss, a magnetic air gap 7 is provided between the magnetic sleeve 5 and the magnetic component 3. The magnetic air gap 7 is 0.2~2mm. The coercivity of the material used in the magnetic sleeve 5 is less than that of the material used in the magnetic component 3. The thickness of the magnetic sleeve 5 is 1.0~5mm, and the thickness of the magnetic component 3 is 2~5mm. The design of the magnetic air gap 7 allows the magnetic sleeve 5 to rotate freely in the alternating magnetic field generated by the magnetic component 3, reducing friction and wear, ensuring the stable generation of hysteresis loss, and thus ensuring the stable output of damping torque. The value of the magnetic air gap 7 is 0.2~2mm, which balances the magnetic flux density and mechanical properties. The ease of processing and reliability ensure stable damper performance. The design of the material used in the magnetic sleeve 5 having less coercivity than the material used in the magnetic component 3 allows the magnetic domains in the magnetic sleeve 5 to flip more easily in the alternating magnetic field generated by the magnetic component 3, effectively generating hysteresis loss and thus stably generating damping torque. This ensures that the damper can output a stable braking torque under various operating conditions. The thickness of the magnetic component 3 ranges from 2 to 5 mm, while the thickness of the magnetic sleeve 5 ranges from 1.0 to 5 mm. The appropriate thickness ensures that the magnetic component generates an alternating magnetic field of sufficient strength and uniformity, while also enabling the magnetic sleeve 5 to effectively respond to changes in the magnetic field and generate appropriate hysteresis loss.

[0046] In addition, to facilitate the generation of a magnetic field, the magnetic component 3 is a plurality of magnetic strips arranged in an N-S separation or a magnetic ring magnetized by radial multipole; the design of a plurality of magnetic strips arranged in an N-S separation or a magnetic ring magnetized by radial multipole can provide different ways of generating a magnetic field, meet different design and application requirements, and increase the diversity and flexibility of damper design.

[0047] In use, multiple magnetic components 3 arranged in an N / S interval are fixedly installed inside the housing 1, corresponding to the outer side of the main shaft 2. The magnetic components 3 are made of neodymium iron boron or samarium cobalt. Neodymium iron boron has the characteristics of high magnetic energy product and high coercivity, which enables the magnetic components 3 to generate a stable and high-intensity N / S alternating magnetic field. This magnetic field exists inside the housing 1 in a specific spatial distribution form, providing a basic magnetic field environment for the operation of the damper. When the main shaft 2 drives the magnetic sleeve 5 to rotate relative to each other in the N / S alternating magnetic field generated by the magnetic components 3, the magnetic domains in the hysteresis material magnetic sleeve 5 repeatedly flip under the action of the alternating magnetic field. Since the flipping of the magnetic domains lags behind the change of the magnetic field, hysteresis loss is generated. This hysteresis loss is macroscopically manifested as a force opposite to the direction of relative motion between the magnetic sleeve 5 and the magnetic components 3, that is, a damping torque or braking torque, which dampens the rotation of the main shaft 2. At the same time, since the adjusting component 6 is connected to the sliding sleeve 4, when the operator operates the adjusting component 6, the magnetic sleeve 5 rotates relative to the magnetic components 3. The segment component 6 drives the sliding sleeve 4 to move axially. The axial displacement of the moving sleeve 4 will drive the magnetic sleeve 5 to move synchronously, thereby adjusting the length of the magnetic sleeve 5 covering the outside of the magnetic component 3. Under the condition that the materials and dimensions of the magnetic component 3 and the magnetic sleeve 5 are fixed, the damping torque is proportional to the axial coverage length of the magnetic sleeve 5 and the magnetic component 3. When the length of the magnetic sleeve 5 covering the magnetic component 3 increases, more of the magnetic sleeve 5 area is in the alternating magnetic field of the magnetic component 3, the hysteresis loss generated by the magnetic domain flipping increases, and the damping torque increases accordingly. Conversely, when the coverage length decreases, the damping torque decreases, thereby realizing stepless adjustment of the damping torque from minimum to maximum to meet the diverse torque requirements under different working conditions. In addition, the main shaft 2 and the sliding sleeve 4 are both made of stainless steel, which has good corrosion resistance. The housing 1 is made of aluminum alloy, which has good thermal conductivity, so as to balance the dimensional changes after the temperature rise and ensure the stable operation of the damper.

[0048] Specifically, the adjustment assembly 6 includes a screw 61 rotatably connected to the housing 1 and the two end caps 11 and passing through the other end cap 11, and a drive member 62 disposed on the outside of the other end cap 11 for driving the screw 61 to rotate. The screw 61 is screwed to the outside of the sliding sleeve 4, and the drive member 62 includes a nut disposed on the outside of one of the end caps 11 and fixedly connected to the end of the screw 61.

[0049] Since the nut is connected to the screw 61, when the resistance torque needs to be adjusted, the operator only needs to rotate the nut, which will drive the screw 61 to rotate synchronously. Since the screw 61 is screwed to the outer side of the sliding sleeve 4, and the sliding sleeve 4 slides inside the housing 1, the sliding sleeve 4 can move axially within the housing 1 as the screw 61 rotates. The magnetic sleeve 5 is fixedly set inside the sliding sleeve 4, so the axial movement of the sliding sleeve 4 will drive the magnetic sleeve 5 to move axially as well. At the same time, the magnetic component 3 is fixedly set inside the housing 1 at the position corresponding to the outer side of the main shaft 2. Thus, the axial movement of the magnetic sleeve 5 changes the length of its coverage outside the magnetic component 3. Since the magnitude of the damping torque is proportional to the axial coverage length of the magnetic sleeve 5 and the magnetic component 3, when the length of the magnetic sleeve 5 covering the magnetic component 3 increases, more of the magnetic sleeve area is affected by the alternating magnetic field of the magnetic component 3, the hysteresis loss generated by the magnetic domain flipping increases, and the damping torque increases accordingly; conversely, when the coverage length decreases, the damping torque decreases.

[0050] Furthermore, the sliding sleeve 4 and the housing 1 have an indicator component 8 for indicating the length adjustment of the magnetic sleeve 5. The indicator component 8 includes a pointer 81 that passes through the housing 1 and is fixedly connected to the side of the sliding sleeve 4 away from the screw 61, a through hole 82 opened on the housing 1 corresponding to the position of the pointer 81, and a scale set on one side of the through hole 82. The end of the pointer 81 away from the sliding sleeve 4 is slidably connected in the through hole 82.

[0051] When the operator drives the sliding sleeve 4 through the operating adjustment component 6, causing the sliding sleeve 4 and magnetic sleeve 5 to move axially, the pointer 81 is fixedly connected to one side of the sliding sleeve 4, and the side of the pointer 81 away from the sliding sleeve 4 slides in the through hole 82. Since the through hole 82 is provided with a scale, the pointer 81 can move synchronously in the through hole 82 as the sliding sleeve 4 moves. Thus, the operator can directly observe the value of the adjustment length of the magnetic sleeve 5 by pointing the pointer 81 to a certain value on the scale in the through hole 82. Since the magnitude of the damping torque is proportional to the axial coverage length of the magnetic sleeve 5 and the magnetic component 3, indicating the adjustment length of the magnetic sleeve 5 indirectly indicates the change in the magnitude of the damping torque, which makes it easier for the operator to adjust the damping torque to a suitable value according to the actual working conditions.

[0052] Example 2

[0053] Unlike Example 1, as Figure 5 As shown, in order to achieve electrified adjustment, the drive unit 62 includes a motor that is fixedly installed outside one of the end caps 11 and fixedly connected to the end of the screw 61. By using a motor as the drive unit 62, the motor can be connected to the output terminal of the electrical control system. By sending corresponding commands to the motor through the electrical control system, the rotation of the screw 61 can be precisely controlled. This makes the adjustment process of the damper electrified, which is convenient for integration with the automated production system and enables remote or automatic control.

[0054] Example 3

[0055] Unlike Examples 1 and 2, as Figure 6 As shown, in order to meet the needs of different application scenarios, the adjustment component 6 includes a servo electric cylinder or pneumatic cylinder fixedly installed outside another end cover 11. The piston rod of the servo electric cylinder or pneumatic cylinder is fixedly connected to the outer side of the sliding sleeve 4. By using a servo electric cylinder or pneumatic cylinder as the adjustment component 6, the operator only needs to turn on the servo electric cylinder or pneumatic cylinder and use the piston rod of the servo electric cylinder or pneumatic cylinder to linearly drive the sliding sleeve 4 to replace the screw 61 and nut. The response speed is faster and the axial position adjustment of the sliding sleeve 4 can be completed in a short time. It can quickly adapt to changes in working conditions and meet the needs of different application scenarios.

[0056] Example 4

[0057] Unlike Example 1, as Figure 7 As shown, in order to facilitate flexible adjustment according to specific working conditions, multiple magnetic components 3 are fixedly installed inside the sliding sleeve 4, and the magnetic sleeve 5 is fixedly installed outside the main shaft 2. Since different working conditions have different requirements for the relative positions of magnetic components 3 and magnetic sleeve 5, the positions of magnetic components 3 and magnetic sleeve 5 can be interchanged to change the magnetic circuit structure and the way the magnetic field interacts, so that the damper can be flexibly adjusted according to specific working conditions, thereby increasing the flexibility of damper design.

[0058] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and concept of this application, should be included within the scope of protection of this application.

Claims

1. An adjustable permanent magnet damper, comprising a housing (1), end caps (11) respectively fixed at both ends of the housing (1), and a main shaft (2) rotatably connected inside the housing (1) and on the two end caps (11) and passing through the two end caps (11). Its features are: The permanent magnet damper also includes a magnetic component (3) disposed inside the housing (1) corresponding to the outside of the main shaft (2) for generating a magnetic field, a sliding sleeve (4) that moves axially inside the housing (1), a magnetic sleeve (5) fixedly disposed inside the sliding sleeve (4) and located on one side outside the plurality of magnetic components (3), and an adjustment component (6) disposed on the housing (1) and the end cap (11) and connected to the sliding sleeve (4) for driving the sliding sleeve (4) to move and adjusting the length of the magnetic sleeve (5) covering the outside of the magnetic component (3). The housing (1) is made of aluminum alloy, the main shaft (2) and the sliding sleeve (4) are both made of stainless steel, the magnetic component (3) is made of neodymium iron boron or samarium cobalt, and the magnetic sleeve (5) is made of hysteresis material. The hysteresis material is unmagnetized aluminum nickel cobalt or iron chromium cobalt or iron cobalt vanadium alloy.

2. The adjustable permanent magnet damper according to claim 1, characterized in that: A magnetic air gap (7) is provided between the magnetic sleeve (5) and the magnetic component (3). The magnetic air gap (7) is 0.2~2mm. The coercivity of the material used in the magnetic sleeve (5) is less than that of the material used in the magnetic component (3). The thickness of the magnetic sleeve (5) is 1.0~5mm, and the thickness of the magnetic component (3) is 2~5mm.

3. The adjustable permanent magnet damper according to claim 2, characterized in that: The magnetic component (3) is a plurality of magnetic strips arranged in an N-N separation or a magnetic ring magnetized by radial multipole.

4. The adjustable permanent magnet damper according to claim 1, characterized in that: The adjustment assembly (6) includes a screw (61) rotatably connected inside the housing (1) and on the two end caps (11) and passing through the other end cap (11), and a drive member (62) disposed outside the other end cap (11) for driving the screw (61) to rotate. The screw (61) is screwed to the outside side of the sliding sleeve (4).

5. The adjustable permanent magnet damper according to claim 4, characterized in that: The drive unit (62) includes a nut disposed outside the two end caps (11) and fixedly connected to the end of the screw (61).

6. The adjustable permanent magnet damper according to claim 4, characterized in that: The sliding sleeve (4) and the housing (1) have an indicator component (8) for indicating the adjustment length of the magnetic sleeve (5).

7. The adjustable permanent magnet damper according to claim 6, characterized in that: The indicating component (8) includes a pointer (81) that passes through the housing (1) and is fixedly connected to the side of the sliding sleeve (4) away from the screw (61), a through hole (82) opened on the housing (1) corresponding to the position of the pointer (81), and a scale set on one side of the through hole (82). The end of the pointer (81) away from the sliding sleeve (4) is slidably connected in the through hole (82).

8. The adjustable permanent magnet damper according to claim 4, characterized in that: The drive unit (62) includes a motor that is fixedly mounted on the outside of the two end caps (11) and fixedly connected to the end of the screw (61).

9. The adjustable permanent magnet damper according to claim 1, characterized in that: The adjustment assembly (6) includes a servo electric cylinder or pneumatic cylinder fixedly installed outside another end cap (11), and the piston rod of the servo electric cylinder or pneumatic cylinder is fixedly connected to the outer side of the sliding sleeve (4).

10. The adjustable permanent magnet damper according to claim 1, characterized in that: Multiple magnetic components (3) are fixedly disposed inside the sliding sleeve (4), and the magnetic sleeve (5) is fixedly disposed outside the main shaft (2).

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