CN112161022B - Current vortex crank arm type buffer - Google Patents

Abstract

The invention discloses an eddy current crank-arm type buffer, comprising a rocker arm on which a connecting rod is hinged, characterized in that the buffer further comprises a support plate, the support plate is provided with a A fixed fixed part, the support plate is rotatable with the rocker arm about a shaft or axis, a magnet and a conductor, one of which is mounted on the support plate, and the other of which is mounted on the support plate On the rocker arm, and the positions of the magnet and the conductor are opposite, the rotation of the support plate and the rocker arm about the shaft or axis can drive the magnet and the conductor to cut the magnetic line of force to generate damping force. The buffer of the invention has simple and durable structure, obvious buffering effect, no working fluid, no leakage problem, and no power supply required for working in a magnetic field. Especially when applied to an electric shovel, it can reduce the maintenance cost of the electric shovel, reduce the failure time of the electric shovel, and create greater economic benefits for mine production.

Description

Eddy Current Articulating Arm Shock Absorber

technical field

The invention relates to the technical field of buffers, in particular to a crank arm type buffer utilizing eddy current effect.

Background technique

Shock absorbers are often used to reduce the impact force between components caused by vibration. Traditional buffer devices include mechanical and hydraulic. Mechanical buffers need to adjust the spring preload frequently. Improper adjustment will cause the buffers to be too tight or too loose; while hydraulic buffers have problems of leakage and sealing. These two types of buffers have higher requirements on the structures and materials in contact with each other, and the fatigue strength and durability of the structures and materials are often difficult to meet the requirements, resulting in poor buffering effect of the buffer device, low service life, and maintenance of the buffer. and high replacement costs.

When the above-mentioned mechanical or hydraulic buffer device is applied to the vibration reduction between the shovel body and the bucket door of the electric shovel equipment, the mechanical buffer needs to adjust the preload force of the spring frequently. If the adjustment is improper, the buffer will be too tight. Or too loose, the two buffers cannot work at the same time and need to be replaced frequently. In addition, the mechanical buffer is likely to cause serious damage to the bucket door and shorten its life; while the hydraulic buffer has problems of liquid leakage and sealing. These two types of buffers have higher requirements on the structures and materials in contact with each other, and the fatigue strength and durability of the structures and materials are often difficult to meet the requirements, resulting in poor buffering effect of the buffer device, low service life, and maintenance of the buffer. and high replacement costs.

Another example, Chinese invention patent CN201410550231.X discloses a rotary magnetorheological damper, as shown in FIG. 1 , which includes a cylinder, an upper end cover, a lower end cover, a stator, a rotor blade, a magnetic circuit and an upper end. The rocker arm connected to the stator outside the cover, the upper and lower end covers, the stator and the cylinder are sealed, the upper end cover is provided with a wire hole and an exhaust hole, the rotor blade can rotate around the stator, and the rotor blade is connected to the upper end cover. The lower end cover is a dynamic seal, which divides the cylinder body into two sealed spaces, and the magnetic circuits are respectively arranged in the two sealed spaces, which are dynamically sealed with the root of the rotor blade and the cylinder barrel, and fixedly sealed with the upper and lower end covers. It is a relatively lighter rotary magnetorheological damper that can provide large damping force and can adjust the damping force in real time.

Considering the structure of the above electromagnetic damper and the damping strength it can provide, it is not suitable for some industrial dampers.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, and to provide an eddy current crank arm buffer with a simple structure and high damping.

In order to achieve the above-mentioned purpose of the invention, the present invention provides the following technical solutions:

An eddy current crank arm type buffer, comprising a rocker arm, a connecting rod is hinged on the rocker arm, and characterized in that, the buffer further comprises:

a support plate, the support plate is provided with a fixing part for fixing, the support plate can rotate with the rocker arm about a shaft or an axis,

A magnet and a conductor, one of the magnets and conductors is mounted on the support plate, the other of the magnets and conductors is mounted on the rocker arm, and the positions of the magnet and the conductor are opposite,

The rotation of the support plate and the rocker arm about the shaft or axis can drive the magnet and the conductor to cut the magnetic line of force and generate a damping force.

Some preferred technical solutions of the present invention are as follows:

Preferably, the magnets include 4 groups, and one group of magnets is arranged on one side of each sub-support plate. Each group of magnets is arranged in a circle around the middle axis of the sub-support plate, and opposite magnetic poles are alternately arranged in a sector-shaped area on the entire circumference.

Preferably, the magnet is a magnetic steel, the magnetic steel is fixed on the support plate, and the conductor is fixed on the rocker arm at a position opposite to the magnetic steel.

Preferably, the rocker arm includes three sub-rocker arms, the support plate includes two sub-support plates, the sub-rocker arms and the sub-support plates are alternately arranged, on both sides of the sub-support plate facing the sub-rocker arm A magnetic steel is installed on the sub-rocker arm, and a conductor is installed at a position opposite to the magnetic steel on the sub-rocker arm.

Preferably, the sub-rocker arms are fixed together by the shaft, and can rotate relative to the sub-support plate around the shaft.

Preferably, the sector-shaped area includes several magnets arranged outward from the shaft or axis, wherein the sector-shaped area has 1 magnet at the innermost side, 3 magnets at the outermost side, and 2 magnets in the middle. The magnet poles in the area are oriented in the same direction.

Preferably, the sub-rocker arm and the sub-support plate have a circular portion overlapping an axial projection of the shaft, the shaft being located at the center of the circular portion.

Preferably, two through holes are further provided on the sub-support plate, and the through holes are used to install the sub-support plate on the bucket body of the electric shovel through a pin shaft.

Preferably, the connecting rod is provided with a pin for hinged connection with the bucket door of the electric shovel.

Preferably, the distance between the axis of the shaft and the center of the hinge of the connecting rod is 30 cm to 85 cm, and the corresponding damping force generated by the movement of the magnet and the conductor to cut magnetic lines of force is 500 N.m.s/rad to 2300 N.m.s/rad, The range of rotation angle is 1.26rad.

Compared with the prior art, the beneficial effects of the present invention:

Simple and durable structure, obvious buffering effect, no working fluid, no leakage problem; no contact, no wear, no friction damping; no power supply required to work in a magnetic field. Especially when applied to the electric shovel, compared with other buffers, it does not need to be adjusted and replaced frequently to reduce the loss of accessories related to the electric shovel door and bucket body; when there is no impact, there is no additional stiffness; it is the availability rate of the electric shovel. The upgrade of the shovel provides a strong guarantee, greatly reduces the maintenance cost of the electric shovel, reduces the failure time of the electric shovel, and creates greater economic benefits for the mine production.

Description of drawings

Figure 1 is a schematic diagram of a prior art buffer;

2 is a schematic diagram of an embodiment of the present invention;

Figure 3 is a cross-sectional view of the embodiment shown in Figure 2;

Fig. 4 is the schematic diagram of the embodiment shown in Fig. 2 being installed on the electric shovel;

FIG. 5 is a layout diagram of a single group of magnetic steels according to the embodiment shown in FIG. 2 .

Detailed ways

The present invention will be further described in detail below with reference to the examples and specific implementation manners. However, it should not be construed that the scope of the above-mentioned subject matter of the present invention is limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

A specific embodiment of the present invention, as shown in FIG. 2 and FIG. 3 , is an eddy current crank arm type buffer, which is mainly composed of two main parts including a transmission support assembly and an eddy current buffer generator, wherein the transmission support assembly includes a pin Shaft 1, connecting rod 2, pin shaft 3, rocker arm 4, magnetic steel support plate 7 and fixed shaft 5, wherein the rocker arm 4 is composed of 3 plates, the magnetic steel support plate 7 is composed of 2 plates, the rocker arm 4 and The magnetic steel support plates 7 are alternately arranged. The eddy current buffer generator includes a conductor plate 8 and a magnetic steel 9 . In this embodiment, the conductor plate 8 is fixed on the side of the rocker arm, and the magnetic steel 9 is fixed on both sides of the magnetic steel support plate 7 . As shown in Fig. 5, the magnet arrangement on the magnetic steel support plate 7, the magnetic steel 9 on one side of the magnetic steel support plate 7 is arranged in a circle around the middle axis, and the opposite magnetic poles are alternately arranged in the entire circumference according to a fan-shaped area, and the fan-shaped area includes A number of magnets are arranged outward from the shaft or axis, wherein the sector area has one magnet at the innermost side, 3 magnets at the outermost side, and 2 magnets in the middle, and the magnets in the same sector area have the same magnetic poles, In this embodiment, 10 sector-shaped magnets are arranged on the circumference.

In this way, when the rocker arm rotates, the fixed magnetic field generated by the conductor plate 8 and the magnetic steel 9 moves with each other, generating eddy currents and interacting with the original magnetic field to generate a force that hinders the relative movement of the conductor plate 8 and the magnetic field, thereby limiting the rocking The rotation speed of the arm. In this embodiment, one end of the eddy current buffer is connected to the bucket door 11 , and the other end is installed on the bucket body 10 . One end of the buffer connecting rod 2 is connected with the bucket door 11 through the pin shaft 1, the bucket door 11 and the connecting rod 2 can rotate relatively through the pin shaft 1, the other end of the connecting rod is connected with the upper end of the rocker arm 4 through the pin shaft 3, and the connecting rod 2 is connected with the rocker arm 4. The arm 4 can rotate relatively around the pin shaft 3, the conductor plate 8 is fixed on the rocker arm 4 by screws, the rocker arm 4 cooperates with the magnetic steel support plate 7 through the fixed shaft 5, and the two can rotate relative to each other, and the magnetic steel 9 is fixed on the rocker arm 4 by screws. There is a certain gap between the magnetic steel support plate 7 and the conductor plate 8 , and the magnetic steel support plate 7 is installed on the bucket body 10 through the pin shaft 6 .

In the above embodiment, when the bucket door 11 moves at a certain speed, the impact force generated by the movement of the bucket door 11 is transmitted through the connecting rod 2 and the rocker arm 4 and applied to the eddy current buffer, and the conductor plate 8 on the rocker arm 4 is applied to the eddy current buffer. It produces relative motion with the magnetic steel 9 fixed on the magnetic steel support plate 7, generates an eddy current and interacts with the original magnetic field, and generates a force that hinders the relative movement of the conductor plate 8 and the magnetic field. Part of the motion energy of the rocker arm is converted into heat energy and dissipated, resulting in a damping effect and limiting the impact speed of the rocker arm 4, thereby achieving the purpose of decelerating and buffering the bucket door 11 and avoiding structural damage.

Based on the above embodiment, in order to achieve a better vibration reduction effect, the distance from the fixed shaft 5 on the rocker arm 4 to the pin shaft 3 can be set to 55cm, the length of the connecting rod 2 is set to 75cm, and the conductor plate 8 is preferably annular The material is T2, the thickness and inner and outer diameters are 1cm, φ1.2cm, φ4.2cm, respectively, and the magnetic field strength provided by the magnetic steel is 0.92T.

Claims (6)

1. An eddy current crank arm type buffer, comprising a rocker arm, and a connecting rod is hinged on the rocker arm, wherein the buffer also includes, a support plate, the support plate is provided with a fixing part for fixing, the support plate can rotate with the rocker arm about a shaft or an axis, A magnet and a conductor, one of the magnets and conductors is mounted on the support plate, the other of the magnets and conductors is mounted on the rocker arm, and the positions of the magnet and the conductor are opposite, The rotation of the support plate and the rocker arm about the shaft or the axis can drive the magnet and the conductor to cut the magnetic field line, and generate a damping force; The rocker arm includes three sub-rocker arms, the support plate includes two sub-support plates, the sub-rocker arms and the sub-support plates are alternately arranged, and two sides of the sub-support plate facing the sub-rocker arm are installed. Magnetic steel, a conductor is installed on the sub-rocker arm at a position opposite to the magnetic steel; The magnets include 4 groups, one group of magnets is arranged on one side of each sub-support plate, and each group of magnets is arranged in a circle around the middle axis of the sub-support plate, and the entire circumference is alternately arranged with opposite magnetic poles in a sector-shaped area; The sector-shaped area includes several magnets arranged outward from the shaft or axis, wherein the sector-shaped area has 1 magnet at the innermost side, 3 magnets at the outermost side, and 2 magnets in the middle. The magnet poles are facing the same; The distance between the axis of the shaft and the center of the hinge of the connecting rod is 30cm to 85cm, and the corresponding damping force generated by the movement of the magnet and the conductor to cut the magnetic line of force is 500 N.m.s/rad to 2300 N.m.s/rad, and the rotation angle is 500 N.m.s/rad. The range is 1.26rad. 2 . The eddy current crank arm type buffer according to claim 1 , wherein the magnet is a magnetic steel, the magnetic steel is fixed on the support plate, and the conductor is fixed on the rocker arm. 3 . position relative to the magnet. 3 . The eddy current crank arm type buffer according to claim 2 , wherein the sub rocker arms are fixed together by the shaft, and can rotate relative to the sub support plate around the shaft. 4 . 4 . The eddy current crank arm damper according to claim 1 , wherein the sub-rocker arm and the sub-support plate have circular portions that overlap with the axial projection of the shaft, and the shaft in the center of this circular section. 5 . The eddy current crank arm type buffer according to claim 4 , wherein two through holes are further provided on the sub-support plate, and the through holes are used for supporting the sub-support through a pin shaft. 6 . The plate is installed on the bucket body of the electric shovel. 6 . The eddy current crank arm buffer according to claim 5 , wherein the connecting rod is provided with a pin for hinged connection with the bucket door of the electric shovel. 7 .

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