Adjustable permanent magnet damper

Abstract

The invention 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] The present application relates to the technical field of permanent magnet brakes, and specifically to an adjustable permanent magnet damper. Background Art

[0002] In many process industries, such as the yarn manufacturing, wire processing, wire and cable production industries, the stable operation of equipment and product quality control highly rely on precise process parameter adjustment. Among them, as the core execution unit, the brake functions to provide controllable and constant torque output to precisely control key parameters such as the tension and speed of the object being processed. In such working conditions, the permanent magnet brake is often selected as the key source for generating the unwind tension of the processing object due to its unique advantages; at the same time, in test scenarios such as motor testing, the demand for a constant torque load also makes the permanent magnet brake an indispensable test device.

[0003] However, traditional axial flux brakes are relatively common. One type of axial flux brake with a kinematic pair composed of a pair of relatively rotating magnetic material disks controls the torque by adjusting the disk gap. However, the magnetic flux direction of this structure is axial. When it is desired to increase the torque, it is necessary to increase the amount of axial magnetic material. The magnetic material extending outward from the center of the shaft generates less torque in the central part, resulting in material waste. Moreover, although the torque is proportional to the disk gap, the control is non-linear, and it is difficult to accurately grasp during adjustment, leading to uncontrollability; Another type of axial flux brake composed of two fixed pairs and a rotating pair controls the magnetic flux by adjusting the relative angle between the magnetic poles of the two fixed pairs, and then adjusts the torque. However, although its torque is proportional to the angle difference between the fixed pairs, it is also non-linear control, and it is difficult to ensure the adjustment accuracy; In addition, when adjusting the above traditional brakes, tools or measuring instruments are often required, the operation is cumbersome, usually requiring the operator to cooperate with both hands, and even multiple people need to cooperate to complete, making it extremely inconvenient to use.

[0004] Therefore, the present application provides an adjustable permanent magnet damper to solve the above problems. Summary of the Invention

[0005] The present application provides an adjustable permanent magnet damper, aiming to solve the problems existing in the existing traditional axial flux brakes in the background art, such as material waste, uncontrollable adjustment due to non-linear torque control, low adjustment accuracy, and cumbersome and inconvenient operation.

[0006] To achieve the above object, the present application provides the following technical solution: An adjustable permanent magnet damper, including a housing, a main shaft respectively fixed at both ends of the housing, and a main shaft rotatably connected in the housing and to two end covers and passing through the two end covers; The permanent magnet damper further includes a magnetic member disposed inside the housing corresponding to the outside of the main shaft for generating a magnetic field, a sliding sleeve axially movable inside the housing, a magnetic sleeve fixedly disposed inside the sliding sleeve and on one side outside the plurality of magnetic members, and an adjusting assembly disposed on the housing and the end cover 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 member; The housing is made of aluminum alloy material, the main shaft and the sliding sleeve are both made of stainless steel material, the magnetic member is made of neodymium iron boron or samarium cobalt material, the magnetic sleeve is made of a magnetic hysteresis material, and the magnetic hysteresis material is an unmagnetized aluminum nickel cobalt or iron chromium cobalt material or an iron cobalt vanadium alloy; by changing the position of the sliding sleeve through the adjusting assembly, the length of the magnetic sleeve covering the outside of the magnetic member is further adjusted. Since the axial covering length of the magnetic sleeve and the magnetic member is proportional, the stepless adjustment of the damping torque from minimum to maximum can be realized to meet the diverse torque requirements under different working conditions. At the same time, the magnetic member is made of neodymium iron boron or samarium cobalt material, which has strong magnetism and can effectively generate an alternating magnetic field, while the magnetic sleeve is made of a magnetic hysteresis material, and the magnetic hysteresis material is an unmagnetized aluminum nickel cobalt or iron chromium cobalt material or an iron cobalt vanadium alloy. These materials themselves have appropriate magnetic hysteresis characteristics and can effectively generate magnetic hysteresis loss in the alternating magnetic field generated by the magnetic member, thereby stably generating a damping torque. The magnetic member and the magnetic sleeve cooperate with each other, so that the adjustable permanent magnet damper adopts a radial magnetic circuit structure. Under the condition of generating the same torque, compared with the traditional axial flux brake, the usage amount of magnetic materials is reduced, the material utilization rate is improved, the cost is saved, and the design of the adjusting assembly does not require the assistance of additional complex tools or the cooperation of multiple people. The operator can operate with one hand, and the operation is convenient and fast. In addition, the main shaft and the sliding sleeve are both made of stainless steel material and have good corrosion resistance; the housing is made of aluminum alloy material, and the aluminum alloy has good thermal conductivity to balance the dimensional change after the heat rise, ensuring the stable operation of the damper.

[0007] Preferably, in order to ensure smooth relative rotation between the magnetic sleeve and the magnetic member and effectively generate hysteresis loss, a magnetic air gap is provided between the magnetic sleeve and the magnetic member. The magnetic air gap is 0.2 - 2 mm. The coercive force of the material used for the magnetic sleeve is less than that of the material used for the magnetic member. The thickness of the magnetic sleeve is 1.0 - 5 mm, and the thickness of the magnetic member 3 is 2 - 5 mm. The design of the magnetic air gap enables the magnetic sleeve to rotate freely in the alternating magnetic field generated by the magnetic member, reducing friction and wear, ensuring stable generation of hysteresis loss, and thus ensuring stable output of the damping torque. The value of the magnetic air gap satisfies 0.2 - 2 mm, which can balance the magnetic flux density with the machining difficulty and reliability, making the performance of the damper stable. The design that the coercive force of the material used for the magnetic sleeve is less than that of the material used for the magnetic member makes the magnetic domains in the magnetic sleeve easier to flip in the alternating magnetic field generated by the magnetic member, effectively generating hysteresis loss, and thus stably generating the damping torque to ensure that the damper can output a stable braking torque under various working conditions. The thickness of the magnetic member ranges from 2 to 5 mm, and the thickness of the magnetic sleeve ranges from 1.0 to 5 mm. The appropriate thickness can ensure that the magnetic member generates an alternating magnetic field with sufficient strength and uniformity, and at the same time enables the magnetic sleeve to effectively respond to the magnetic field change and generate appropriate hysteresis loss.

[0008] Preferably, in order to facilitate the generation of a magnetic field, the magnetic member is a plurality of magnetic strips arranged in an N-S separated manner or a magnetic ring magnetized radially with multiple poles; the design of a plurality of magnetic strips arranged in an N-S separated manner or a magnetic ring magnetized radially with multiple poles provides different magnetic field generation methods, meets different design and application requirements, and increases the diversity and flexibility of the damper design.

[0009] Preferably, in order to facilitate the adjustment of the length of the magnetic sleeve covering the magnetic member, the adjustment assembly includes a screw rod rotatably connected to the inside of the housing and the two end caps and passing through the other end cap, and a driving member provided outside the other end cap for driving the screw rod to rotate. The screw rod is screwed to the outside of one side of the sliding sleeve; by screwing the screw rod to the sliding sleeve, the operator only needs to operate the driving member to convert the rotation of the screw rod into the axial displacement of the sliding sleeve, and then the adjustment of the length of the magnetic sleeve covering the magnetic member can be realized, thereby adjusting the damping torque.

[0010] Preferably, in order to facilitate the operation of the adjustment assembly, the driving member includes a nut provided outside the two end caps and fixedly connected to the end of the screw rod; the driving member is set as a nut, and the operator can easily adjust the rotation of the screw rod by rotating the nut, and then adjust the position of the magnetic sleeve. The operation is simple and intuitive, and no additional power equipment is required.

[0011] Preferably, for the convenience of accurate adjustment by the operator, an indicating component for indicating the adjustment length of the magnetic sleeve is provided on the sliding sleeve and the housing; the design of the indicating component can visually display the adjustment length of the magnetic sleeve, enabling the operator to directly and clearly obtain the specific value of the adjustment length of the magnetic sleeve, thereby achieving accurate adjustment of the damping torque and improving the accuracy and efficiency of adjustment.

[0012] Preferably, for the convenience of visually presenting the value of the adjustment length of the magnetic sleeve, the indicating component includes a pointer penetrating through the housing and fixedly connected to the side of the sliding sleeve away from the screw rod, a through hole opened in the housing at the position corresponding to the pointer, and a scale provided on one side of the through hole. The end of the pointer away from the sliding sleeve is slidably connected in the through hole; the pointer slides in the through hole and cooperates with the scale. The operator only needs to observe the position of the pointer on the scale to directly obtain the information of the adjustment length of the magnetic sleeve, without the need for complex calculations or additional measurements, greatly reducing the operation difficulty.

[0013] Preferably, for realizing electrified adjustment, the driving member includes a motor fixedly installed outside the two end covers and fixedly connected to the end of the screw rod; using a motor as the driving member can precisely control the rotation of the screw rod through an electrical control system, which enables the adjustment process of the damper to be electrified, facilitating integration with an automated production system and realizing remote control or automatic control.

[0014] Preferably, to meet the requirements of different application scenarios, the adjustment component includes a servo electric cylinder or a cylinder fixedly installed outside the other end cover, and the piston rod of the servo electric cylinder or the cylinder is fixedly connected to the outside of one side of the sliding sleeve; using a servo electric cylinder or a cylinder as the adjustment component, replacing the screw rod and the nut with the linear drive of the servo electric cylinder or the cylinder, the response speed is faster, and the axial position of the sliding sleeve can be adjusted within a short time, and it can quickly adapt to the change of working conditions to meet the requirements of different application scenarios.

[0015] Preferably, for the convenience of flexible adjustment according to specific working conditions and increasing the flexibility of the damper design, a plurality of magnetic members are fixedly arranged inside the sliding sleeve, and the magnetic sleeve is fixedly arranged outside the main shaft; since different working conditions have different requirements for the relative positions of the magnetic members and the magnetic sleeve, swapping the positions of the magnetic members and the magnetic sleeve can change the magnetic circuit structure and the way of magnetic field interaction, enabling the damper to be flexibly adjusted according to specific working conditions.

[0016] The adjustable permanent magnet damper changes the position of the sliding sleeve through the adjustment component, and then adjusts the length of the magnetic sleeve covering the outside of the magnetic member. Since the axial covering lengths of the magnetic sleeve and the magnetic member are proportional, the stepless adjustment of the damping torque from minimum to maximum can be realized to meet the diverse torque requirements under different working conditions; The adjustable permanent magnet damper uses neodymium iron boron material for the magnetic part. This material has strong magnetism and can effectively generate an alternating magnetic field. The magnetic sleeve uses a hysteresis material. The two cooperate with each other, enabling the adjustable permanent magnet damper to adopt a radial magnetic circuit structure. In the case of generating the same torque, compared with traditional axial flux brakes, the usage amount of magnetic materials is reduced, the material utilization rate is improved, and the cost is saved. Through the design of the adjustment component, the adjustable permanent magnet damper can be operated with one hand by the operator without the need for additional complex tools or the cooperation of multiple people, and the operation is convenient and fast. The adjustable permanent magnet damper uses a motor as the driving part and can precisely control the rotation of the screw through an electrical control system. This makes the adjustment process of the damper electrified, facilitating integration with an automated production system to achieve remote control or automatic control. The adjustable permanent magnet damper uses a servo electric cylinder or a cylinder as the adjustment component, and uses the linear drive of the servo electric cylinder or the cylinder to replace the screw and the nut. The response speed is faster, and the axial position adjustment of the sliding sleeve can be completed in a short time, and it can quickly adapt to the change of working conditions and meet the needs of different application scenarios. By swapping the positions of the magnetic part and the magnetic sleeve, the adjustable permanent magnet damper can change the magnetic circuit structure and the way of magnetic field interaction, enabling the damper to be flexibly adjusted according to specific working conditions. Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of an adjustable permanent magnet damper in Embodiment 1; Figure 2 It is a schematic structural diagram of an adjustable permanent magnet damper after the magnetic sleeve is adjusted in Embodiment 1; Figure 3 It is a schematic structural diagram of the magnetic part being a combination of multiple magnetic strips in Embodiment 1; Figure 4 It is a schematic structural diagram of the magnetic part being a radially multi-pole magnetized magnetic ring in Embodiment 1; Figure 5 It is a schematic structural diagram of the driving part in Embodiment 2; Figure 6 It is a schematic structural diagram of the adjustment component in Embodiment 3; Figure 7 It is a schematic structural diagram of an adjustable permanent magnet damper in Embodiment 4.

[0018] In the figure: 1. Housing; 11. End cover; 2. Main shaft; 3. Magnetic part; 4. Sliding sleeve; 5. Magnetic sleeve; 6. Adjustment component; 61. Screw; 62. Driving part; 7. Magnetic air gap; 8. Indicator assembly; 81. Pointer; 82. Through hole;. Detailed implementation mode

[0019] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present application.

[0020] Embodiment 1

[0021] This embodiment provides an adjustable permanent magnet damper, as Figures 1-4 shown. The permanent magnet damper includes a housing 1, a main shaft 2 respectively fixed at both ends of the housing 1, and a main shaft 2 that is rotatably connected inside the housing 1 and two end covers 11 and penetrates through the two end covers 11. The permanent magnet damper further includes a magnetic member 3 provided inside the housing 1 corresponding to the outside of the main shaft 2 for generating a magnetic field, a sliding sleeve 4 axially moving inside the housing 1, a magnetic sleeve 5 fixedly provided inside the sliding sleeve 4 and located on one side outside the plurality of magnetic members 3, and an adjusting assembly 6 provided on the housing 1 and the end covers 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 member 3; the housing 1 is made of aluminum alloy material, the main shaft 2 and the sliding sleeve 4 are both made of stainless steel material, the magnetic member 3 is made of neodymium iron boron or samarium cobalt material, the magnetic sleeve 5 is made of a hysteresis material, and the hysteresis material is an unmagnetized alnico or iron chromium cobalt material or an iron cobalt vanadium alloy.

[0022] Among them, in order to ensure smooth relative rotation between the magnetic sleeve and the magnetic member 3 and effectively generate hysteresis loss, a magnetic air gap 7 is provided between the magnetic sleeve 5 and the magnetic member 3. The magnetic air gap 7 is 0.2 to 2 mm. The coercive force of the material used for the magnetic sleeve 5 is less than that of the material used for the magnetic member 3. The thickness of the magnetic sleeve 5 is 1.0 to 5 mm, and the thickness of the magnetic member 3 is 2 to 5 mm. The design of the magnetic air gap 7 enables the magnetic sleeve 5 to rotate freely in the alternating magnetic field generated by the magnetic member 3, reducing friction and wear, ensuring stable generation of hysteresis loss, and thus ensuring stable output of the damping torque. The value of the magnetic air gap 7 satisfies 0.2 to 2 mm, which can balance the magnetic flux density with the machining difficulty and reliability, making the performance of the damper stable. The design that the coercive force of the material used for the magnetic sleeve 5 is less than that of the material used for the magnetic member 3 enables the magnetic domains in the magnetic sleeve 5 to be more easily flipped in the alternating magnetic field generated by the magnetic member 3, effectively generating hysteresis loss, and thus stably generating a damping torque to ensure that the damper can output a stable braking torque under various working conditions. The thickness of the magnetic member 3 ranges from 2 to 5 mm, and the thickness of the magnetic sleeve 5 ranges from 1.0 to 5 mm. The appropriate thickness can ensure that the magnetic member generates an alternating magnetic field with sufficient strength and uniformity, while enabling the magnetic sleeve 5 to effectively respond to magnetic field changes and generate appropriate hysteresis loss.

[0023] In addition, in order to facilitate the generation of a magnetic field, the magnetic member 3 is a plurality of magnetic strips arranged in an N-S separated manner or a magnetic ring magnetized radially multi-pole; the design of a plurality of magnetic strips arranged in an N-S separated manner or a magnetic ring magnetized radially multi-pole provides different magnetic field generation methods, meets different design and application requirements, and increases the diversity and flexibility of the damper design.

[0024] During use, inside the housing 1, a plurality of magnetic members 3 arranged in an N-S separated manner are fixedly provided corresponding to the outside of the main shaft 2. The magnetic members 3 are made of neodymium iron boron or samarium cobalt materials. The neodymium iron boron material has the characteristics of high magnetic energy product and high coercivity, enabling the magnetic members 3 to generate a stable and relatively strong 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 the N-S alternating magnetic field generated by the magnetic members 3, the magnetic domains in the magnetic hysteresis material magnetic sleeve 5 repeatedly flip under the action of the alternating magnetic field. Due to the characteristic that the flipping of the magnetic domains lags behind the change of the magnetic field, magnetic hysteresis loss will occur. This magnetic hysteresis loss macroscopically manifests as a force opposite to the relative movement direction between the magnetic sleeve 5 and the magnetic members 3, that is, a damping torque or a braking torque, thereby playing a damping role in the rotation of the main shaft 2. At the same time, since the adjusting assembly 6 is connected to the sliding sleeve 4, when the operator operates the adjusting assembly 6 to drive the sliding sleeve 4 to axially move, the axial displacement of the moving sleeve 4 will drive the magnetic sleeve 5 to move synchronously, and then the length of the magnetic sleeve 5 covering the outside of the magnetic members 3 can be adjusted. Under the condition that the materials and dimensions of the magnetic members 3 and the magnetic sleeve 5 are fixed, the damping torque is proportional to the axial covering length of the magnetic sleeve 5 and the magnetic members 3. When the length of the magnetic sleeve 5 covering the magnetic members 3 increases, a larger area of the magnetic sleeve 5 is in the alternating magnetic field of the magnetic members 3, and the magnetic hysteresis loss generated by the flipping of the magnetic domains increases, and the damping torque increases accordingly; conversely, when the covering length decreases, the damping torque decreases, so that the stepless adjustment of the damping torque within the minimum to maximum range can be realized to meet the diverse requirements for torque under different working conditions. In addition, both the main shaft 2 and the sliding sleeve 4 are made of stainless steel material, having good corrosion resistance, and the housing 1 is made of aluminum alloy material. Aluminum alloy has good thermal conductivity, so as to balance the dimensional change after heating and temperature rise and ensure the stable operation of the damper.

[0025] Specifically, the adjusting assembly 6 includes a screw 61 rotatably connected to the inside of the housing 1 and two end covers 11 and passing through the other end cover 11, and a driving member 62 provided outside the other end cover 11 for driving the screw 61 to rotate. The screw 61 is threadedly connected to the outside of one side of the sliding sleeve 4. The driving member 62 includes a nut provided outside one of the end covers 11 and fixedly connected to the end of the screw 61. Since the nut is connected to the screw rod 61, when it is necessary to adjust the resistance torque, the operator only needs to rotate the nut to drive the screw rod 61 to rotate synchronously. Also, since the screw rod 61 is screwed to the outer side of one side of the sliding sleeve 4, and the sliding sleeve 4 slides within the housing 1, therefore, as the screw rod 61 rotates, the sliding sleeve 4 can perform axial movement within the housing 1. And the magnetic sleeve 5 is fixedly arranged inside the sliding sleeve 4, so the axial movement of the sliding sleeve 4 will drive the magnetic sleeve 5 to move axially together. At the same time, the magnetic member 3 is fixedly arranged at a position within the housing 1 corresponding to the outer side of the main shaft 2. In this way, the axial movement of the magnetic sleeve 5 changes the length of its covering outside the magnetic member 3. Since the magnitude of the damping torque is proportional to the axial covering length of the magnetic sleeve 5 and the magnetic member 3, when the length of the magnetic sleeve 5 covering the magnetic member 3 increases, more magnetic sleeve regions are affected by the alternating magnetic field of the magnetic member 3, and the hysteresis loss generated by the magnetic domain flipping increases, and the damping torque increases accordingly; conversely, when the covering length decreases, the damping torque decreases.

[0026] Furthermore, an indicating assembly 8 for indicating the adjustment length of the magnetic sleeve 5 is provided on the sliding sleeve 4 and the housing 1. The indicating assembly 8 includes a pointer 81 passing through the housing 1 and fixedly connected to the side of the sliding sleeve 4 away from the screw rod 61, a through hole 82 opened at a position corresponding to the pointer 81 on the housing 1, and a scale provided on one side of the through hole 82. One end of the pointer 81 away from the sliding sleeve 4 is slidably connected within the through hole 82; When the operator drives the sliding sleeve 4 through the operation of the adjusting assembly 6 to axially move the sliding sleeve 4 and the magnetic sleeve 5, since 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 within the through hole 82, and a scale is provided on one side of the through hole 82, therefore, the pointer 81 can move synchronously within 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 the pointer 81 pointing to a certain value on the scale within the through hole 82. Since the magnitude of the damping torque is proportional to the axial covering length of the magnetic sleeve 5 and the magnetic member 3, so by indicating the adjustment length of the magnetic sleeve 5, the change situation of the magnitude of the damping torque is indirectly indicated, which is convenient for the operator to adjust the damping torque to an appropriate value according to the actual working condition requirements.

[0027] Embodiment 2

[0028] Different from Embodiment 1, as Figure 5 shown, in order to achieve electrified adjustment, the driving member 62 includes a motor fixedly installed outside one of the end covers 11 and fixedly connected to the end of the screw rod 61; Using the motor as the driving member 62, the motor can be connected to the output end of the electrical control system. By sending corresponding instructions to the motor through the electrical control system, the rotation of the screw rod 61 can be accurately controlled, which makes the adjustment process of the damper achieve electrification, facilitating integration with the automated production system to achieve remote control or automatic control.

[0029] Embodiment 3

[0030] Different from Embodiment 1 and Embodiment 2, as Figure 6 shown, in order to meet the requirements of different application scenarios, the adjusting component 6 includes a servo electric cylinder or a cylinder fixedly installed outside another end cover 11, and the piston rod of the servo electric cylinder or the cylinder is fixedly connected to one side outside the sliding sleeve 4; by using the servo electric cylinder or the cylinder as the adjusting component 6, the operator only needs to turn on the servo electric cylinder or the cylinder, and use the piston rod of the servo electric cylinder or the cylinder to linearly drive the sliding sleeve 4 to replace the screw rod 61 and the nut. The response speed is faster, and the axial position adjustment of the sliding sleeve 4 can be completed in a short time, and it can quickly adapt to the change of working conditions and meet the requirements of different application scenarios.

[0031] Embodiment 4

[0032] Different from Embodiment 1, as Figure 7 shown, in order to facilitate flexible adjustment according to specific working conditions, a plurality of magnetic members 3 are fixedly arranged inside the sliding sleeve 4, and the magnetic sleeve 5 is fixedly arranged outside the main shaft 2; since different working conditions have different requirements for the relative positions of the magnetic members 3 and the magnetic sleeve 5, swapping the positions of the magnetic members 3 and the magnetic sleeve 5 can change the magnetic circuit structure and the way of magnetic field interaction, so that the damper can be flexibly adjusted according to specific working conditions, thereby increasing the flexibility of the damper design.

[0033] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application, according to the technical solution and its concept of the present application, makes an equivalent replacement or change, and should be covered by the protection scope of the present application.

Claims

1. An adjustable permanent magnet damper, comprising a housing (1), a main shaft (2) respectively fixed at both ends of the housing (1), and a main shaft (2) rotatably connected inside the housing (1) and on two end covers (11) and passing through the two end covers (11); It is characterized in that: The permanent magnet damper further includes a magnetic member (3) arranged inside the housing (1) corresponding to the outside of the main shaft (2) for generating a magnetic field, a sliding sleeve (4) axially moving inside the housing (1), a magnetic sleeve (5) fixedly arranged inside the sliding sleeve (4) and on the outer side of a plurality of the magnetic members (3), and an adjusting assembly (6) arranged on the housing (1) and the end covers (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 member (3); The housing (1) is made of aluminum alloy material, the main shaft (2) and the sliding sleeve (4) are both made of stainless steel material, the magnetic member (3) is made of neodymium iron boron or samarium cobalt material, the magnetic sleeve (5) is made of a magnetic hysteresis material, and the magnetic hysteresis material is unmagnetized aluminum nickel cobalt or iron chromium cobalt material or iron cobalt vanadium alloy.

2. The adjustable permanent magnet damper according to claim 1, wherein: A magnetic air gap (7) is arranged between the magnetic sleeve (5) and the magnetic member (3), the magnetic air gap (7) is 0.2 - 2 mm, the coercive force of the material used for the magnetic sleeve (5) is less than the coercive force of the material used for the magnetic member (3), the thickness of the magnetic sleeve (5) is 1.0 - 5 mm, and the thickness of the magnetic member (3) is 2 - 5 mm.

3. The adjustable permanent magnet damper according to claim 2, wherein: The magnetic member (3) is a plurality of magnetic strips arranged in an N - S separated manner or a magnetic ring radially multi - pole magnetized.

4. The adjustable permanent magnet damper according to claim 1, wherein: The adjusting assembly (6) includes a screw rod (61) rotatably connected inside the housing (1) and on two end covers (11) and passing through another end cover (11), and a driving member (62) arranged outside another end cover (11) for driving the screw rod (61) to rotate, and the screw rod (61) is screwed to the outer side of the sliding sleeve (4).

5. The adjustable permanent magnet damper according to claim 4, wherein: The driving member (62) includes a nut arranged outside two end covers (11) and fixedly connected to the end of the screw rod (61).

6. The adjustable permanent magnet damper according to claim 4, wherein: An indicating assembly (8) on the sliding sleeve (4) and the housing (1) for indicating the adjusted length of the magnetic sleeve (5).

7. The adjustable permanent magnet damper according to claim 6, characterized in that: The indicating assembly (8) includes a pointer (81) passing through the housing (1) and fixedly connected to the side of the sliding sleeve (4) away from the screw rod (61), a through hole (82) opened on the housing (1) at the position corresponding to the pointer (81), and a scale arranged on one side of the through hole (82), and one 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, wherein: The driving member (62) includes a motor fixedly installed outside two end covers (11) and fixedly connected to the end of the screw rod (61).

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

10. The adjustable permanent magnet damper according to claim 1, wherein: A plurality of the magnetic members (3) are fixedly arranged inside the sliding sleeve (4), and the magnetic sleeve (5) is fixedly arranged outside the main shaft (2).

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