Double-slider connecting rod nonlinear energy trap

Abstract

The invention provides a double-slider connecting rod nonlinear energy trap, which belongs to the technical field of vibration control, and comprises a bottom plate, a spring bracket, a slide rail, a horizontal spring, a horizontal vibrator, a connecting rod, a vertical vibrator and a vertical elastic element, the spring support and the sliding rail are fixedly installed on the bottom plate, the spring support is perpendicular to the upper surface of the bottom plate, and the sliding rail is parallel to the upper surface of the bottom plate. The horizontal vibrator is mounted on the sliding rail in a sliding manner; the horizontal spring is parallel to the upper surface of the bottom plate, and two ends are respectively connected with the spring bracket and the horizontal vibrator; the vertical vibrator and the spring support are located on the two sides of the horizontal vibrator, the vertical vibrator is connected with the bottom plate through the vertical elastic element, and the moving direction of the vertical vibrator is perpendicular to the upper surface of the bottom plate. And two ends of the connecting rod are respectively hinged with the horizontal vibrator and the vertical vibrator. According to the energy trap, the required installation space is reduced while the energy trap shows nonlinear rigidity and controllable damping force, and the energy trap has a good practical application prospect.

Description

Technical Field

[0001] The present invention belongs to the technical field of vibration control, and specifically discloses a double-slider link non-linear energy sink. Background Art

[0002] Due to the change in the hardness of coal mine rock strata, when coal mine tunneling equipment is working, the drum at the end of the cutting arm will generate intense impact loads. These loads generated by the cutting work are large in intensity and strong in time-variation, mainly concentrated in the low-frequency band, which will cause damage, failure and even fracture of key components such as bolts, slewing tables and cantilever beams, seriously affecting the reliability, stability and safety of equipment operation.

[0003] A dynamic vibration absorber, also called a tuned mass damper, is a small mechanical device for vibration control, which can be divided into a linear vibration absorber and a non-linear vibration absorber. The applicable frequency range of the linear vibration absorber is relatively narrow, and it is difficult to be applicable to working scenarios with large excitation signal intensity and wide frequency band. Compared with the linear vibration absorber, the non-linear vibration absorber has better broadband vibration suppression ability due to its non-linear stiffness. As a kind of non-linear vibration absorber, the Nonlinear Energy Sink (NES) has received attention from researchers in recent years and has been applied to the vibration control of civil buildings and mechanical equipment.

[0004] However, in order to achieve non-linear stiffness and vibration damping function, the traditional NES needs to construct an arch structure in the vibration direction, and the movement direction of the oscillator must be consistent with the vibration direction, resulting in a large occupied space. For example, the energy sink devices proposed in Patent No. CN115110656A and Patent No. CN212376380U cannot overcome the limitation of the oscillator vibration on the overall volume of the energy sink while improving the damping energy dissipation effect. For example, when coal mine tunneling equipment is working in a roadway, the cutting arm needs to perform pitching motion. Due to the limitation of the roadway height, there is not enough space on the cutting arm to install the NES; if the volume of the NES is reduced, a good vibration suppression effect cannot be obtained.

[0005] Therefore, there is an urgent need for a NES with a wide vibration suppression frequency band, small occupied space, strong energy dissipation effect, good vibration suppression effect and suitable for vibration suppression of the cutting arm. Summary of the Invention

[0006] The present invention provides a double-slider link non-linear energy sink with cubic stiffness, which is mainly used for vibration control of the cutting arm of coal mine tunneling equipment, can ensure installation on the cutting arm of tunneling equipment without affecting the normal operation of the cutting arm in the roadway, damp the cutting arm during tunneling, effectively suppress cutting vibration in a wide frequency range, and meet the requirements of safe and efficient operation of tunneling equipment.

[0007] The double-slider link non-linear energy sink provided by the present invention includes a bottom plate, a spring bracket, a slide rail, a horizontal spring, a horizontal oscillator, a link, a vertical oscillator, and a vertical elastic element; the spring bracket and the slide rail are fixedly installed on the bottom plate, the spring bracket is perpendicular to the upper surface of the bottom plate, and the slide rail is parallel to the upper surface of the bottom plate; the horizontal oscillator is slidably installed on the slide rail; the horizontal spring is parallel to the upper surface of the bottom plate, and both ends are respectively connected to the spring bracket and the horizontal oscillator; the vertical oscillator and the spring bracket are located on both sides of the horizontal oscillator, the vertical oscillator and the bottom plate are connected by a vertical elastic element, and the movement direction of the vertical oscillator is perpendicular to the upper surface of the bottom plate; both ends of the link are respectively hinged to the horizontal oscillator and the vertical oscillator; in the static state of the double-slider link non-linear energy sink, the center line of the link is parallel to the upper surface of the bottom plate.

[0008] In the above double-slider link non-linear energy sink, the masses of the horizontal oscillator and the vertical oscillator can be adjusted.

[0009] In the above double-slider link non-linear energy sink, the horizontal oscillator is provided with a closable inner cavity of the horizontal oscillator, and several damping particles are filled in the inner cavity of the horizontal oscillator; the damping particles are steel balls or steel balls coated with rubber on the surface, with a diameter of 5-30 mm, and the total filling rate does not exceed 50% of the total volume of the inner cavity of the horizontal oscillator.

[0010] In the above double-slider link non-linear energy sink, a support block is provided on the bottom plate; the slide rail is installed on the support block, and the contact surface between the slide rail and the horizontal oscillator is made of high manganese steel or polytetrafluoroethylene.

[0011] In the above double-slider link non-linear energy sink, a protrusion Ⅰ and a stiffening rib are respectively provided on both sides of the spring bracket; a protrusion Ⅱ is provided on the horizontal oscillator; hooks are provided at both ends of the horizontal spring, and the hooks at both ends are respectively connected to the protrusion Ⅰ and the protrusion Ⅱ.

[0012] In the above double-slider link non-linear energy sink, a hinge hole Ⅰ is provided on the horizontal oscillator, and the two hinge holes Ⅰ are symmetrically arranged with the horizontal spring as the axis of symmetry; two groups of hinge blocks are provided on the vertical oscillator, the two groups of hinge blocks are symmetrically arranged with the horizontal spring as the axis of symmetry, and two hinge holes Ⅱ are provided on each group of hinge blocks; the first end of the link is an L-shaped structure, the second end is a T-shaped structure, the first end is hinged to a single hinge hole Ⅰ, and the second end is respectively hinged to the two hinge holes Ⅱ in the same group of hinge blocks.

[0013] In the above double-slider link non-linear energy sink, the vertical oscillator is provided with an open inner cavity of the vertical oscillator, and several mass adjustment blocks are installed in the inner cavity of the vertical oscillator through bolts.

[0014] In the above-mentioned double-slider link non-linear energy sink, the vertical elastic element includes a vertical bolt, a vertical guide rail, and a vertical spring; the vertical bolt is installed on the bottom plate and perpendicular to the upper surface of the bottom plate; the vertical guide rail slides through the vertical oscillator, and the bottom end is fixedly connected to the top end of the vertical bolt; the vertical spring is sleeved on the vertical guide rail, and both ends are respectively connected to the bottom plate and the vertical oscillator.

[0015] In the above-mentioned double-slider link non-linear energy sink, the horizontal spring is a tension spring, and the stiffness of the horizontal spring is 10 to 15 times the total stiffness of all vertical springs.

[0016] The above-mentioned double-slider link non-linear energy sink further includes a magnetorheological damper; both ends of the magnetorheological damper are respectively hinged to the bottom plate and the vertical oscillator, the magnetorheological damper is located on the vertical center line of the vertical oscillator, and multiple vertical elastic elements are arranged around the magnetorheological damper.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1) The double-slider link non-linear energy sink proposed by the present invention effectively reduces the vertical height of the energy sink while maintaining the non-linear stiffness, reduces the occupied space, enables the non-linear energy sink to be installed on mechanisms with narrow working spaces such as the cutting arm of a roadheader-anchoring machine, and greatly improves the application range of the non-linear energy sink.

[0019] 2) The double-slider link non-linear energy sink proposed by the present invention has strong non-linear characteristics. Compared with a common cubic stiffness energy sink using springs with the same stiffness, the double-slider link non-linear energy sink has stronger cubic stiffness characteristics within the same stroke range.

[0020] 3) The double-slider link non-linear energy sink proposed by the present invention combines particle damping and a magnetorheological damper, combines passive control and semi-active control, and has stronger energy dissipation ability.

[0021] 4) The double-slider link non-linear energy sink proposed by the present invention has the function of adjusting the mass of the oscillator, can adjust the natural frequency of the energy sink according to different working scenarios, and has good broadband vibration absorption characteristics.

[0022] 5) The double-slider link non-linear energy sink proposed by the present invention is provided with two sets of oscillators. When a certain component in the energy sink fails or malfunctions, it can still maintain good vibration absorption characteristics and has good robustness. Description of the Drawings

[0023] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 It is a schematic structural diagram of a double-slider link non-linear energy sink;

[0025] Figure 2 is Figure 1 top view of;

[0026] Figure 3 is a cross-sectional view along the Figure 2 A-A direction in;

[0027] Figure 4 It is a schematic structural diagram of a spring bracket;

[0028] Figure 5 It is a schematic structural diagram of a slide rail;

[0029] Figure 6 It is a schematic structural diagram of a horizontal spring;

[0030] Figure 7 It is a schematic structural diagram of a vertical elastic element.

[0031] In the figure: 1 - bottom plate; 2 - spring bracket; 3 - slide rail; 4 - horizontal spring; 5 - horizontal oscillator; 6 - link; 7 - vertical oscillator; 8 - vertical elastic element; 8.1 - vertical bolt; 8.2 - vertical guide rail; 8.3 - vertical spring; 9 - magnetorheological damper; 10 - damping particles; 11 - mass adjustment block. Specific Embodiments

[0032] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the drawings. Obviously, the described embodiments are some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0033] This embodiment provides a double-slider link non-linear energy sink, including a bottom plate 1, a spring bracket 2, a slide rail 3, a horizontal spring 4, a horizontal oscillator 5, a link 6, a vertical oscillator 7, a vertical elastic element 8, and a magnetorheological damper 9.

[0034] The spring support 2 is fixedly installed on the bottom plate by bolts and is perpendicular to the upper surface of the bottom plate 1. On both sides of the spring support 2, there are respectively a protrusion Ⅰ and a stiffening rib. The protrusion Ⅰ is used to connect the horizontal spring 4, and the stiffening rib is used to enhance the lateral stiffness resistance of the spring support 2.

[0035] The slide rail 3 is fixedly installed on the bottom plate 1 and is parallel to the upper surface of the bottom plate 1. The upper surface and both side surfaces are sliding friction surfaces, and the sliding friction surfaces are made of materials such as high manganese steel and polytetrafluoroethylene.

[0036] The horizontal oscillator 5 is slidably installed on the slide rail 3. A chute in contact with the sliding friction surface is provided on the lower surface, and it can slide freely on the slide rail 3 without falling off. On the horizontal oscillator 5, there are a protrusion Ⅱ and a hinge hole Ⅰ. The protrusion Ⅱ is used to connect the horizontal spring 4, and the two hinge holes Ⅰ are symmetrically arranged with the horizontal spring 4 as the axis of symmetry. The hinge hole Ⅰ is used to connect the connecting rod 6.

[0037] The mass of the horizontal oscillator 5 can be adjusted according to the natural frequency of the vibration damping object. The specific implementation method is as follows: The horizontal oscillator 5 is provided with a closable inner cavity of the horizontal oscillator, and a number of vibration damping particles 10 are filled in the inner cavity of the horizontal oscillator. The vibration damping particles 10 are steel balls or steel balls coated with rubber on the surface, with a diameter of 5 - 30 mm, and the total filling rate does not exceed 50% of the total volume of the inner cavity of the horizontal oscillator.

[0038] The horizontal spring 4 is parallel to the upper surface of the bottom plate 1, and hooks are provided at both ends. The hooks at both ends are respectively connected to the protrusion Ⅰ and the protrusion Ⅱ through pins.

[0039] The vertical oscillator 7 and the spring support 2 are located on both sides of the horizontal oscillator 5. The vertical oscillator 7 and the bottom plate 1 are connected by a vertical elastic element 8, and the movement direction of the vertical oscillator 7 is perpendicular to the upper surface of the bottom plate 1. On the vertical oscillator 7, there are two groups of hinge blocks, which are symmetrically arranged with the horizontal spring 4 as the axis of symmetry. Each group of hinge blocks is provided with two hinge holes Ⅱ for connecting the connecting rod 6. A smooth hole is opened on the lower surface of the vertical oscillator 7.

[0040] The mass of the vertical oscillator 7 can be adjusted according to the natural frequency of the vibration damping object. The specific implementation method is as follows: The vertical oscillator 7 is provided with an open inner cavity of the vertical oscillator, and a number of mass adjustment blocks 11 are installed in the inner cavity of the vertical oscillator by bolts. Preferably, the shape of the inner cavity of the vertical oscillator is the same as the shape of the mass adjustment block 11, and screw holes are designed at the center of the inner cavity of the vertical oscillator and the center of the mass adjustment block 11. The corresponding number of mass adjustment blocks 11 can be vertically stacked according to actual requirements and fastened by bolts.

[0041] The vertical elastic element 8 includes a vertical bolt 8.1, a vertical guide rail 8.2 and a vertical spring 8.3; the vertical bolt 8.1 is installed on the bottom plate 1 and perpendicular to the upper surface of the bottom plate 1; the vertical guide rail 8.2 slides through the smooth hole of the vertical oscillator 7, and the bottom end is welded and fixed to the top end of the vertical bolt 8.1. This design aims to limit the vertical oscillator 7 to move only in the direction perpendicular to the upper surface of the bottom plate 1, and at the same time effectively offset the acting force from the horizontal direction; the vertical spring 8.3 is sleeved on the vertical guide rail 8.2, and the two ends are respectively connected to the bottom plate 1 and the vertical oscillator 7. Preferably, the length of the vertical guide rail 8.2 is 1.2 to 1.5 times the length of the vertical spring 8.3. The vertical guide rail 8.2 is a cylindrical guide rail.

[0042] Both ends of the connecting rod 6 are respectively hinged to the horizontal oscillator 5 and the vertical oscillator 7 to form a double-slider connecting rod mechanism. In this embodiment, the first end of the connecting rod 6 is an L-shaped structure, the second end is a T-shaped structure, the first end is hinged to a single hinge hole Ⅰ, and the second end is respectively hinged to two hinge holes Ⅱ in the same group of hinge blocks. The surface of the connecting rod 6 is smooth, and the friction during movement is small.

[0043] Support blocks are provided on the bottom plate 1, and the slide rail 3 is fixedly installed on the support block 10 by welding. The height is adjusted through the support block 10 so that the center line of the connecting rod 6 is parallel to the upper surface of the bottom plate 1 when the double-slider connecting rod non-linear energy trap is in a static state.

[0044] Both ends of the magnetorheological damper 9 are respectively hinged to the bottom plate 1 and the vertical oscillator 7 through pin shafts. The magnetorheological damper 9 is located on the vertical center line of the vertical oscillator 7, and multiple vertical elastic elements 8 are arranged around the magnetorheological damper. The setting of the magnetorheological damper 9 enables the energy trap to have a non-linear stiffness while being able to change the magnitude of the damping force according to the motion state of the vibration reduction target, improving the vibration reduction and energy consumption effect.

[0045] In the above double-slider connecting rod non-linear energy trap, the horizontal spring 4 is a tension spring. When there is no vibration, the spring maintains its original length, and the connecting rod 6 is parallel to the upper surface of the base 1. When the energy trap vibrates, the vertical oscillator 7 drives the horizontal oscillator 5 to move, causing the horizontal spring 4 to be stretched. At this time, the tension generated by the horizontal spring 4 is transmitted through the connecting rod 6 and applies a force with cubic stiffness characteristics to the vertical oscillator 7. According to the design requirements, the stiffness of the horizontal spring 4 is 10 to 15 times the total stiffness of all the vertical springs 8.3.

[0046] Working mechanism:

[0047] The double-slider linkage nonlinear energy sink is installed on the cutting arm through the bottom plate 1. At the moment when the cutting arm starts, the double-slider linkage nonlinear energy sink mechanism is triggered, and it quickly absorbs and consumes the vibration energy generated during the operation of the cutting arm. At this time, the vertical oscillator 7 reciprocates up and down along the vertical guide rail 8.2, and then drives the horizontal oscillator 5 to slide horizontally along the slide rail 3. During this process, the damping particles 10 in the horizontal oscillator 5 collide with each other, further strengthening the consumption of vibration energy. The horizontal spring 4 applies an elastic force to the vertical oscillator 7 via the connecting rod 6, and the relationship between this force and the displacement of the vertical oscillator 7 exhibits an approximately cubic characteristic, which is mainly determined by the contribution of the horizontal spring 4. The entire energy sink ensures its compact working space in the vertical direction, achieving both wide-band vibration damping performance and avoiding interference with the operation of the cutting arm in the roadway. In addition, the energy sink integrates a magnetorheological damper 9 to implement a semi-active control strategy, further enhancing the vibration suppression performance of the energy sink.

[0048] When the target vibration damping object vibrates, it drives the vertical oscillator 7 to vibrate. The vertical oscillator 7 drives the horizontal oscillator 5 to reciprocate on the slide rail 3 through the connecting rod 6. At the same time, the horizontal spring 4 is stretched by the horizontal oscillator 5, generating a pulling force on the horizontal oscillator 5. This pulling force is transmitted to the vertical oscillator 7 through the connecting rod 6. Since the movement direction of the vertical oscillator 7 is fixed by the vertical guide rail 8.2, its horizontal component force can be regarded as zero, and the vertical component force F can be expressed as:

[0049]

[0050] In the formula, k x represents the horizontal spring stiffness, k y represents the total stiffness of all vertical springs, l represents the length of the connecting rod, and δ represents the displacement of the vertical oscillator.

[0051] Using the double-slider linkage mechanism enables the energy sink to have cubic stiffness characteristics. While reducing the volume of the energy sink, it increases the range of stiffness change, making the double-slider energy sink have greater wide-band vibration absorption ability.

[0052] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A double slider connecting rod nonlinear energy sink, characterized in that: It includes a bottom plate, a spring bracket, a slide rail, a horizontal spring, a horizontal vibrator, a connecting rod, a vertical vibrator and a vertical elastic element; The spring bracket and the slide rail are fixedly mounted on the bottom plate, the spring bracket is perpendicular to the upper surface of the bottom plate, and the slide rail is parallel to the upper surface of the bottom plate; The horizontal vibrator is slidably mounted on the slide rail; The horizontal spring is parallel to the upper surface of the bottom plate, and its two ends are respectively connected to the spring bracket and the horizontal vibrator; The vertical vibrator and the spring bracket are located on both sides of the horizontal vibrator, the vertical vibrator and the bottom plate are connected via a vertical elastic element, and the movement direction of the vertical vibrator is perpendicular to the upper surface of the bottom plate; The two ends of the connecting rod are respectively hinged to the horizontal vibrator and the vertical vibrator; When the double-slider connecting rod nonlinear energy well is in a static state, the center line of the connecting rod is parallel to the upper surface of the bottom plate.

2. The double slider connecting rod nonlinear energy sink according to claim 1, characterized in that: The masses of the horizontal vibrator and the vertical vibrator can be adjusted.

3. The double slider connecting rod nonlinear energy sink according to claim 2, characterized in that: The horizontal vibrator is provided with a closable horizontal vibrator inner cavity, and a plurality of vibration-damping particles are filled in the horizontal vibrator inner cavity; The vibration-damping particles are steel balls or steel balls coated with rubber, with a diameter of 5-30 mm and a total filling rate not exceeding 50% of the total volume of the inner cavity of the horizontal vibrator.

4. The double slider connecting rod nonlinear energy sink according to claim 1, characterized in that: A support block is arranged on the bottom plate; The slide rail is installed on the support block, and the contact surface between the slide rail and the horizontal vibrator is made of high manganese steel or polytetrafluoroethylene.

5. The double slider connecting rod nonlinear energy sink according to claim 1, characterized in that: The two sides of the spring bracket are respectively provided with a protrusion I and a stiffening rib; The horizontal vibrator is provided with a protrusion II; Hooks are arranged at both ends of the horizontal spring, and the hooks at both ends are respectively connected with the protrusion I and the protrusion II.

6. The double slider connecting rod nonlinear energy sink according to claim 5, characterized in that: The horizontal vibrator is provided with a hinge hole I, and two hinge holes I are symmetrically arranged with the horizontal spring as a symmetry axis; Two sets of hinge blocks are arranged on the vertical vibrator, and the two sets of hinge blocks are symmetrically arranged with the horizontal spring as the symmetry axis, and two hinge holes II are arranged on each set of hinge blocks; The first end of the connecting rod is an L-shaped structure, and the second end is a T-shaped structure. The first end is hinged to a single hinge hole I, and the second end is respectively hinged to two hinge holes II in the same group of hinge blocks.

7. The double slider connecting rod nonlinear energy sink according to claim 2, characterized in that: The vertical vibrator is provided with an open vertical vibrator inner cavity, in which a plurality of mass adjustment blocks are installed by bolts.

8. The double slider connecting rod nonlinear energy sink according to claim 1, characterized in that: The vertical elastic element includes a vertical bolt, a vertical guide rail and a vertical spring; The vertical bolts are installed on the bottom plate and are perpendicular to the upper surface of the bottom plate; The vertical guide rail slides through the vertical vibrator, and the bottom end is fixedly connected to the top end of the vertical bolt; The vertical spring is sleeved on the vertical guide rail, and two ends thereof are respectively connected with the bottom plate and the vertical vibrator.

9. The double slider connecting rod nonlinear energy sink according to claim 8, characterized in that: The horizontal spring is a tension spring, and the stiffness of the horizontal spring is 10 to 15 times the total stiffness of all vertical springs.

10. The double slider connecting rod nonlinear energy sink according to claim 8, characterized in that: Also included are magnetorheological dampers; Two ends of the magnetorheological damper are respectively hinged to the bottom plate and the vertical vibrator. The magnetorheological damper is located on the vertical center line of the vertical vibrator. A plurality of vertical elastic elements are arranged around the magnetorheological damper.

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