An electromagnetic cam inertia capacitance system

Abstract

The present invention relates to an electromagnetic cam inertia capacitance system, which system comprises a fixed shaft (1), a hollow rotating cylinder (2), a moving shaft (3), a transmission shaft (4), an inner magnet sleeve (6) and an outer magnet sleeve (5). The hollow rotating cylinder (2) is connected to the fixed shaft (1). The inner magnet sleeve (6) and the outer magnet sleeve (5) are respectively arranged inside and outside the hollow rotating cylinder (2) and fixed on the fixed shaft (1). The moving shaft (3) is connected to the transmission shaft (4), and the transmission shaft (4) is connected to the fixed shaft (1). Compared with the prior art, the present invention adopts a spatial cam type inertia capacitance to achieve force inertia behavior, and has a simple mechanical form and is easy to implement. By combining the inertia capacitance system with the electromagnetic principle, magnet sleeves are added inside and outside the rotating cylinder of the inertia capacitance system, and magnetic induction lines are cut by the high-speed rotation of the rotating cylinder to generate damping. This inertia capacitance system has the characteristics of both an inertia container and a damper.

Description

Technical Field

[0001] The invention belongs to the technical field of vibration control and relates to an electromagnetic cam inertia system. Background Art

[0002] Currently, there are many implementation mechanisms that can simulate the mechanical behavior of the inertia capacity, such as ball screw type inertia capacity, gear rack type inertia capacity, tuned liquid type inertia capacity, etc. Among them, the motion form conversion device that utilizes translation to rotation is mainly ball screw type and gear rack type, and the existing inertia capacity and inertia capacity system related patents also mostly adopt this form. The gear rack type inertia capacity mainly realizes the conversion of motion through the meshing between the gear and the rack. This form has a weaker effect on the amplification of the inertia coefficient. Although the ball screw type inertia capacity can achieve a better quality efficiency effect, its mechanical structure is complex, requires high processing precision, and has a high manufacturing cost.

[0003] Chinese patent CN113083649A discloses a spatial cam type inertial container, which includes a fixed shaft, a rotating cylinder and a movable moving rod. The rotating cylinder is sleeved outside the fixed shaft, and a spiral groove is provided on the outer wall of the rotating cylinder along the circumferential direction. The moving rod is arranged perpendicular to the axis of the fixed shaft, and the end of the moving rod is movably located in the spiral groove along the axis direction of the fixed shaft. The inertial container of this patent generates inertial force during operation, that is, generates a force proportional to the relative acceleration of the two ends of the inertial container, which can achieve strong mass efficiency. However, this patent only has the characteristics of an inertial container during operation, has a certain tuning effect, but has no damping characteristics, and cannot dissipate the input energy. It is difficult to achieve in actual application, or requires more manufacturing costs to achieve the same shock absorption effect as a device with both the dual performance of an inertial container and a damper.

[0004] Chinese patent CN114135635A discloses an electromagnetic tuning inertia damping device, including a base, a pedestal fixed on the base, and a tuning mass block horizontally movably arranged on the base, and an electromagnetic flywheel-type inertial mass amplification mechanism is provided on the pedestal, and one end of the electromagnetic flywheel-type inertial mass amplification mechanism is connected to the tuning mass block. This patent can achieve the synergistic effect of the inertia coefficient to a certain extent, but this patent essentially uses a ball screw mechanism to realize the conversion of translational input to flywheel rotation, thereby realizing inertia behavior. During the operation of the device, the stress of the part where the nut and the screw are buckled is relatively high. Therefore, the device has high requirements on the material of the nut and the ball, and the structure of the device itself is relatively complex, and the processing accuracy requirements for the nut, the screw thread, and the ball are relatively high. In addition, the device is equipped with a permanent magnet on the pedestal, and uses a conductor copper plate fixed on the flywheel to cut the magnetic flux lines, thereby generating electromagnetic damping. However, the magnetic field intensity that can be generated near the conductor copper plate by this permanent magnet arrangement method is limited, and the efficiency of generating electromagnetic damping is low. Summary of the invention

[0005] The object of the present invention is to overcome the defects of the above-mentioned existing technologies and provide an electromagnetic cam inertial capacitance system. The present invention utilizes the cam mechanical form to realize the inertial capacitance mechanical behavior while cutting magnetic induction lines to generate electromagnetic damping, so that the system not only has inertial characteristics but also has damping characteristics. In practical applications, the system not only has the energy absorption characteristics of an inertial capacitor but also has the energy consumption characteristics of a damper. The combination of the two can also enhance the energy consumption of the damping part and has the ability of efficient shock absorption.

[0006] The object of the present invention can be achieved by the following technical solutions:

[0007] An electromagnetic cam inertial capacitance system, the system includes a fixed shaft, a hollow rotating cylinder, a moving shaft, a transmission shaft, an inner magnet sleeve and an outer magnet sleeve. The hollow rotating cylinder is connected to the fixed shaft. The inner magnet sleeve and the outer magnet sleeve are respectively arranged inside and outside the hollow rotating cylinder and fixed on the fixed shaft. The moving shaft is connected to the transmission shaft, and the transmission shaft is connected to the fixed shaft.

[0008] Furthermore, the side wall of the hollow rotating cylinder is provided with a spiral through groove.

[0009] Furthermore, the inner magnet sleeve and the outer magnet sleeve are provided with straight through grooves on the cross-section passing through the fixed shaft.

[0010] Furthermore, the transmission shaft passes through the spiral through groove and the straight through groove. The widths of the spiral through groove and the straight through groove are adapted to the transmission shaft, and the transmission shaft can slide in the spiral through groove and the straight through groove.

[0011] Furthermore, permanent magnets are respectively arranged on the inner magnet sleeve and the outer magnet sleeve to generate a magnetic field between the two.

[0012] Furthermore, the material of the permanent magnet is neodymium iron boron magnet or ferrite magnet, and the material should be selected according to the actual situation.

[0013] Furthermore, the hollow rotating cylinder is connected to the fixed shaft through a rotating sleeve.

[0014] Furthermore, the transmission shaft is connected to the fixed shaft through a sliding sleeve.

[0015] The hollow rotating cylinder and the fixed shaft can rotate relative to each other and cannot slide relative to each other; the transmission shaft and the fixed shaft can slide relative to each other and cannot rotate relative to each other.

[0016] The diameter and length of the hollow rotating cylinder should be selected according to the target performance of the device. The diameter and length of the fixed shaft should be selected according to the diameter and length of the hollow rotating cylinder. The diameter and length of the inner magnet sleeve should be selected according to the diameter and length of the hollow rotating cylinder and be smaller than those of the hollow rotating cylinder. The diameter and length of the outer magnet sleeve should be selected according to the diameter and length of the hollow rotating cylinder and be larger than those of the hollow rotating cylinder. The diameter and length of the transmission shaft should meet the strength requirements under the designed horizontal load. The diameter of the moving shaft should meet the strength requirements under the designed horizontal load, and the length should be selected according to the actual installation space.

[0017] Furthermore, the materials of the fixed shaft, transmission shaft, moving shaft, inner magnet sleeve and outer magnet sleeve are hard solid materials with good toughness and high strength, including steel or aluminum alloy. The material of the hollow rotating cylinder is a material with good electrical conductivity, including steel, copper or aluminum, and the material selection should be based on the actual situation.

[0018] Furthermore, the moving shaft together with the transmission shaft moves horizontally along the direction of the fixed shaft and drives the hollow rotating cylinder to generate a rotational motion.

[0019] During the whole process, the horizontal motion of the moving shaft is converted into the rotational motion of the hollow rotating cylinder, and the inertial characteristics of both ends of the inertial element can be realized; the hollow rotating cylinder cuts the magnetic induction lines between the magnet sleeves during rotation to generate electromagnetic damping.

[0020] The present invention provides an electromagnetic cam inertial system. This system can realize the conversion of the motion form from translational motion to rotational motion, and further realize the inertial characteristics of both ends of the inertial element; the rotating part of the system cuts the magnetic induction lines of the permanent magnet during rotation, and further generates electromagnetic damping. The output force of this inertial system includes the output force of the inertial element and the electromagnetic damping force. The performance parameters of the inertial element part can be adjusted by adjusting the spiral curve of the spiral through groove of the rotating hollow cylinder, and the performance parameters of the electromagnetic damping element part can be adjusted by adjusting the magnetism of the permanent magnet of the magnet sleeve.

[0021] The derivation process of the inertial coefficient and output force of the electromagnetic cam inertial system is as follows:

[0022] Assume that the outer diameter of the hollow rotating cylinder is R, the thickness is t, the pitch is s, the length is l, and the material density is ρ; the width of the spiral through groove on the cylinder is b, and the number of rotation turns is n. When the horizontal acceleration of the moving shaft is ü, the angular acceleration of the hollow rotating cylinder is

[0023]

[0024] The moment of inertia of the hollow rotating cylinder without spiral through grooves is

[0025]

[0026] In the formula, m1 represents the mass of the hollow rotating cylinder without spiral through slots, and is

[0027] m1 = ρgV1 (3)

[0028] where g represents the acceleration due to gravity, and V1 represents the volume of the hollow rotating cylinder without spiral through slots, and is

[0029] V1 = π[R 2 -(R - t) 2 l (4)

[0030] Substituting formulas (3) and (4) into (2) gives

[0031]

[0032] The moment of inertia of the hollow rotating cylinder with spiral through slots can be approximately estimated as

[0033]

[0034] In the formula, V represents the volume of the hollow rotating cylinder with spiral through slots, and V2 represents the volume of the spiral through slots. The volume V2 of the spiral through slots can be expressed as

[0035]

[0036] Substituting formulas (5) and (7) into (6) gives

[0037]

[0038] When the hollow rotating cylinder with spiral through slots rotates with an angular acceleration the bending moment generated is

[0039]

[0040] If the electromagnetic damping part of the electromagnetic inertial capacitance system is ignored, according to the principle of force balance, the horizontal force F applied to the moving shaft at this time in is the output force of the inertial capacitance part of the system, and the relationship with the bending moment M generated by the hollow rotating cylinder with spiral through slots is

[0041]

[0042] Substituting formulas (8) and (10) into formula (9) gives

[0043]

[0044] Then the inertial capacitance coefficient of the electromagnetic cam inertial capacitance system is

[0045]

[0046] The total output force F of the electromagnetic cam inertia capacitance system t is the output force F of the inertia capacitance part in and the output force F of the electromagnetic damping part c sum:

[0047] F t = F in + F c (13)

[0048] The output force F of the inertia capacitance part in As shown in Equation (11), the output force of the electromagnetic damping part needs to be measured through experiments.

[0049] Compared with the prior art, the present invention has the following advantages:

[0050] (1) While the present invention utilizes the cam mechanical form to achieve the inertia mechanical behavior, it can also utilize the rotating cylinder to cut the magnetic induction lines to generate electromagnetic damping, so that the system not only has the energy absorption characteristics of the inertia container, but also has the energy consumption characteristics of the damper, and has the ability of efficient shock absorption;

[0051] (2) The structure of the present invention is simple, and the requirements for material strength and processing accuracy are both low. Compared with other complex inertia capacitance implementation forms (such as ball screw type), it is easier to achieve large-scale production and manufacturing, and has a higher quality and efficiency improvement effect compared with other inefficient inertia capacitance implementation forms (such as rack and pinion type);

[0052] (3) The internal and external magnetic body sleeves arranged in the present invention can achieve a more reasonable internal magnetic field distribution and improve the generation efficiency of electromagnetic damping. Description of the Drawings

[0053] Figure 1 is a front view structural schematic diagram of the electromagnetic cam inertia capacitance system in the embodiment of the present invention;

[0054] Figure 2 is a side view structural schematic diagram of the electromagnetic cam inertia capacitance system in the embodiment of the present invention;

[0055] Figure 3 is a cross-sectional structural schematic diagram of the electromagnetic cam inertia capacitance system in the embodiment of the present invention.

[0056] Explanation of the marks in the figure:

[0057] 1 - fixed shaft, 2 - hollow rotating cylinder, 3 - moving shaft, 4 - transmission shaft, 5 - outer magnetic body sleeve, 6 - inner magnetic body sleeve, 7 - sliding sleeve, 8 - rotating sleeve. Detailed Embodiment

[0058] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented on the premise of the technical solution of the present invention, and provides a detailed implementation manner and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0059] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0060] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0061] Embodiment:

[0062] As Figures 1 to 3 shown, the present invention relates to an electromagnetic cam inertia capacitance system. In this system, the fixed shaft 1 is fixed and is connected to the hollow rotating cylinder 2 through a rotating sleeve 8. The inner magnet sleeve 6 and the outer magnet sleeve 5 are fixed on the fixed shaft 1. The moving shaft 3 is connected to the fixed shaft 1 through a transmission shaft 4 by a sliding sleeve 7. The transmission shaft 4 and the fixed shaft 1 can produce relative sliding and cannot produce relative rotation; the hollow rotating cylinder 2 and the fixed shaft 1 can produce relative rotation and cannot produce relative sliding. The side wall of the hollow rotating cylinder 2 is provided with a spiral through groove, and the inner magnet sleeve 6 and the outer magnet sleeve 5 are provided with straight through grooves on the cross section passing through the fixed shaft 1. The transmission shaft 4 passes through the spiral through groove and the straight through groove, and the widths of the spiral through groove and the straight through groove are adapted to the transmission shaft 4, and the transmission shaft 4 can slide in the spiral through groove and the straight through groove. Permanent magnets are respectively arranged on the inner magnet sleeve 6 and the outer magnet sleeve 5 to generate a magnetic field between the two. When the device works, the moving shaft 3 together with the transmission shaft 4 moves horizontally along the direction of the fixed shaft 1 and drives the hollow rotating cylinder 2 to generate a rotational motion. During the whole process, the horizontal motion of the moving shaft 3 is converted into the rotational motion of the hollow rotating cylinder 2, and the inertial characteristics of the two end points of the inertia capacitance element can be realized; the hollow rotating cylinder 2 cuts the magnetic induction lines between the inner magnet sleeve 6 and the outer magnet sleeve 5 during the rotation process to generate electromagnetic damping.

[0063] The outer radius of the hollow rotating cylinder 2 is 90 mm, the thickness is 10 mm, and the length is 450 mm; the width of the spiral through groove on the hollow rotating cylinder 2 is 26 mm, the pitch is 36 mm, the number of rotation turns is 12, and the width of the straight through groove is 26 mm; the diameter of the fixed shaft 1 is 60 mm and the length is 700 mm; the outer radius of the inner magnet sleeve 6 is 50 mm, the thickness is 10 mm, and the length is 420 mm; the outer radius of the outer magnet sleeve 6 is 130 mm, the thickness is 10 mm, and the length is 500 mm; the diameter of the transmission shaft 4 is 25 mm and the length is 200 mm, and the diameter of the moving shaft 3 is 30 mm and the length is 400 mm; the materials of the fixed shaft 1, the moving shaft 3, the inner magnet sleeve 6 and the outer magnet sleeve 5 are Q235 steel, the materials of the hollow rotating cylinder 2 and the transmission shaft 4 are Q420 steel, and the material of the permanent magnet is neodymium iron boron magnet. The inertia capacity coefficient of the electromagnetic cam inertia capacity system obtained by theoretical calculation is 36.4 ton.

[0064] The system invented in this patent is not limited to this embodiment. The performance parameters of the inertia capacity element part can be adjusted by using the above formula to change the spiral curve parameters of the hollow rotating cylinder 2 and the spiral through groove according to the target performance requirements, and the performance parameters of the electromagnetic damping element part can be adjusted by adjusting the magnetism of the permanent magnets of the inner magnet sleeve 6 and the outer magnet sleeve 5.

[0065] The above description of the embodiments is for the convenience of those of ordinary skill in the art to understand and use the invention. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative labor. Therefore, the present invention is not limited to the above embodiments, and the improvements and modifications made by those skilled in the art without departing from the scope of the present invention should be within the protection scope of the present invention.

Claims

1. An electromagnetic cam inertia capacitance system, characterized in that, The system includes a fixed shaft (1), a hollow rotating cylinder (2), a moving shaft (3), a transmission shaft (4), an inner magnet sleeve (6) and an outer magnet sleeve (5). The hollow rotating cylinder (2) is rotationally connected to the fixed shaft (1). The inner magnet sleeve (6) and the outer magnet sleeve (5) are respectively arranged inside and outside the hollow rotating cylinder (2) and fixed on the fixed shaft (1). The moving shaft (3) is connected to the transmission shaft (4), and the transmission shaft (4) is slidably connected to the fixed shaft (1). The side wall of the hollow rotating cylinder (2) is provided with a spiral through groove. The inner magnet sleeve (6) and the outer magnet sleeve (5) are provided with straight through grooves on the cross section passing through the fixed shaft (1).

2. The electromagnetic cam inertia capacitance system according to claim 1, wherein The transmission shaft (4) passes through the spiral through groove and the straight through groove, and the widths of the spiral through groove and the straight through groove are adapted to the transmission shaft (4).

3. An electromagnetic cam inertia capacitance system according to claim 1, characterized in that Permanent magnets are respectively arranged on the inner magnet sleeve (6) and the outer magnet sleeve (5).

4. An electromagnetic cam inertia capacitance system according to claim 3, characterized in that, The material of the permanent magnet is neodymium iron boron magnet or ferrite magnet.

5. The electromagnetic cam inertia capacitance system according to claim 1, characterized in that The hollow rotating cylinder (2) is connected to the fixed shaft (1) through a rotating sleeve (8).

6. The electromagnetic cam inertia capacitance system according to claim 1, wherein The transmission shaft (4) is connected to the fixed shaft (1) through a sliding sleeve (7).

7. An electromagnetic cam inertia system according to claim 1, characterized in that The materials of the fixed shaft (1), the transmission shaft (4), the moving shaft (3), the inner magnet sleeve (6) and the outer magnet sleeve (5) include steel or aluminum alloy, and the material of the hollow rotating cylinder (2) includes steel, copper or aluminum.

8. An electromagnetic cam inertia system according to claim 1, wherein, The moving shaft (3) together with the transmission shaft (4) moves horizontally along the direction of the fixed shaft (1) and drives the hollow rotating cylinder (2) to generate a rotational motion.

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