Rotary inertial drive piezoelectric vibration feeder

Abstract

The application discloses a rotary inertial drive piezoelectric vibration feeding device, which comprises a top disc, a material disc, a mass block, a bottom disc and N driving units; the driving unit comprises a piezoelectric bimorph, a connecting block, a gasket, a first spring sheet and a second spring sheet; the material disc and the top disc are coaxially fixedly connected; the N driving units are circumferentially and uniformly arranged between the top disc and the bottom disc and are all connected with the mass block. When working, a specified sinusoidal alternating current signal is applied on the piezoelectric bimorph, the piezoelectric bimorph generates bending vibration, drives the spring sheet to vibrate, and then excites the composite vibration mode of the vertical direction and the torsional direction of the top disc. Under the action of inertia and friction, the material in the material disc can be transported in the specified direction; the amplitude of the top disc and the frequency of the whole machine can be adjusted by changing the volume of the mass block, and the mass block can improve the amplitude of the top disc, reduce the vibration transmitted to the base and improve the stability during the material transportation.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of piezoelectric driving, vibration feeding, material conveying and micro-particle transportation, and in particular to a rotary inertia-driven piezoelectric vibration feeding device. BACKGROUND

[0002] The piezoelectric vibration feeding device has the advantages of high conveying precision, low noise and fast conveying speed, and has important application value in the production fields requiring automatic and precise conveying, such as automatic packaging, modern precise semiconductor device testing and sealing, and precise mechanical machining and assembly.

[0003] The piezoelectric vibration feeding device can be divided into linear type and rotary type according to the material conveying mode. In 1977, the researchers of Japan Special Ceramics Corporation first proposed a piezoelectric vibration feeder using a rectangular piezoelectric ceramic sheet as a driving source. The linear piezoelectric vibration feeder developed by Japanese researchers mainly consists of a base, a piezoelectric vibrator, a spring sheet, a top plate and the like. The working principle is that when the piezoelectric vibrator is excited by an alternating excitation signal, due to the inverse piezoelectric effect, the spring sheet produces reciprocating bending deformation under the excitation of the piezoelectric ceramic, which induces the top plate to produce elliptical motion, thereby conveying the material. Compared with the electromagnetic-driven vibration material conveying device, the piezoelectric vibration material conveying device has the advantages of no electromagnetic interference, low noise and high conveying precision.

[0004] The rotary piezoelectric vibration feeding device is modified on the basis of the linear piezoelectric vibration feeding device, and mainly consists of a disc, a spring sheet, a piezoelectric bimorph and a base. Three or more groups of spring sheets are arranged on the bottom of the disc in a tilted manner, and the spring sheets are connected with the piezoelectric bimorph. During operation, alternating current is supplied to the piezoelectric bimorph, which excites the piezoelectric bimorph to produce reciprocating bending deformation through the inverse piezoelectric effect. This deformation is transmitted to the top disc through the spring sheet, so that the top disc vibrates up and down and twists around the central axis. Due to the twisting and vertical composite motion of the top disc, the material in the material disc moves quickly along the spiral slide. Due to the working principle, the structure of the above-mentioned rotary piezoelectric vibration feeding device has been fixed for a long time, and has not been changed much until now. When the rotary piezoelectric vibration feeding device works in the resonance state, the piezoelectric bimorph transmits vibration to the top disc and the base respectively, which causes the base to vibrate very seriously. The base vibration is usually solved by adding vibration isolation foot pads on the base, but this wastes the vibration energy of the piezoelectric bimorph. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a rotary inertia-driven piezoelectric vibration feeding device aiming at the defects involved in the background art.

[0006] The present application adopts the following technical solutions to solve the above technical problems:

[0007] A rotary inertial drive piezoelectric vibration feeding device, comprising a top disc, a material disc, a mass block, a bottom disc and N driving units, N is a natural number greater than or equal to 3;

[0008] The material disc is a hollow cylinder with an open upper end and a closed lower end, and the side wall of the material disc is provided with a material outlet;

[0009] The top disc is disc-shaped, and the lower end surface of the top disc is uniformly provided with N first fixing seats corresponding to the driving units in a circumferential direction;

[0010] The mass block is an axisymmetric cylinder, and the side wall of the mass block is uniformly provided with N second fixing seats corresponding to the driving units in a circumferential direction;

[0011] The bottom disc is ring-shaped, and the upper end surface of the bottom disc is uniformly provided with N third fixing seats corresponding to the driving units in a circumferential direction;

[0012] The driving unit comprises a piezoelectric bimorph, a connecting block, a gasket, a first spring sheet and a second spring sheet;

[0013] The piezoelectric bimorph comprises a substrate, a first piezoelectric ceramic sheet and a second piezoelectric ceramic sheet, wherein the substrate is a rectangular plate; the first piezoelectric ceramic sheet and the second piezoelectric ceramic sheet are symmetrically pasted on the center of two sides of the substrate, are polarized along the thickness direction, and have the same polarization direction;

[0014] The connecting block is fixedly connected with the lower end of the first spring sheet, the upper end of the second spring sheet and the lower end of the substrate of the piezoelectric bimorph respectively, so that the first spring sheet, the second spring sheet and the substrate of the piezoelectric bimorph are parallel to each other;

[0015] The N driving units are uniformly arranged in a circumferential direction between the top disc and the bottom disc, wherein the upper end of the first spring sheet in the driving unit is fixedly connected with the corresponding first fixing seat, the lower end of the second spring sheet is fixedly connected with the corresponding third fixing seat, and the upper end of the substrate of the piezoelectric bimorph is fixedly connected with the corresponding second fixing seat, so that the top disc, the mass block and the bottom disc are coaxial, and an included angle exists between the axis of the first spring sheet of the driving unit and the top disc.

[0016] As a further optimization scheme of the rotary inertial drive piezoelectric vibration feeding device, the application further comprises a rubber ring and a base;

[0017] The upper end surface of the base is horizontally arranged, and a first annular groove matched with the rubber ring is arranged on the upper end surface of the base;

[0018] All second annular grooves matched with the rubber ring are arranged on the lower end surface of the bottom disc, and the second annular grooves are coaxial with the bottom disc;

[0019] The rubber ring is arranged between the chassis and the base and is connected with the first annular groove and the second annular groove respectively.

[0020] As a further optimization scheme of the rotary inertia driving piezoelectric vibration feeding device, the upper end surface of the material disc is provided with a protrusion.

[0021] The protrusion is any one of a cone, a circular truncated cone or a cylinder, and the bottom surface of the protrusion is coaxially connected with the upper end surface of the material disc, so that a discharging groove is formed between the protrusion and the side wall of the material disc.

[0022] The material outlet on the material disc is communicated with the discharging groove.

[0023] As a further optimization scheme of the rotary inertia driving piezoelectric vibration feeding device, the base is provided with a plurality of through holes for disassembly.

[0024] The volume of the mass block can be changed, so as to adjust the amplitude of the top disc and the frequency of the whole machine.

[0025] As a further optimization scheme of the rotary inertia driving piezoelectric vibration feeding device, the rubber ring is connected with the first annular groove and the second annular groove by any one of silicone, polyurethane glue and modified epoxy glue.

[0026] The application further discloses a driving method of the rotary inertia driving piezoelectric vibration feeding device, which comprises the following steps.

[0027] The piezoelectric bimorphs on the N driving units are simultaneously applied with a sine alternating current signal of a preset frequency threshold, the piezoelectric bimorphs of the N driving units are excited to generate a bending vibration mode under the excitation of the sine alternating current signal, and the first and second spring sheets are driven to generate bending vibration, and then the top disc is driven to generate torsional vibration, since there is an included angle between the first spring sheet of the driving unit and the axis of the top disc, the material disc fixed on the top disc generates composite motion in the vertical direction under the action of the top disc, so that the material in the material groove is conveyed under the action of inertia and friction.

[0028] Compared with the prior art, the application has the following technical effects:

[0029] 1. The feeding device has high precision and fast material conveying speed, and the conveying speed is easy to adjust.

[0030] 2. The device increases the mass block, which can increase the horizontal amplitude of the material disc, reduce the vibration of the base, and the size of the mass block can be changed according to the vibration effect.

[0031] 3. The inclination angle between the driving unit and the base effectively improves the vibration and torsional amplitude of the device, and improves the conveying speed of the material.

[0032] 4. The material tray is designed to transport the material along a specific trajectory. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is a structural diagram of the present application;

[0034] Figure 2 is a structural diagram of the material tray in the present application;

[0035] Figure 3 is a structural diagram of the top tray in the present application;

[0036] Figure 4 is a structural diagram of the mass block in the present application;

[0037] Figure 5 is a structural diagram of the bottom tray in the present application;

[0038] Figure 6 is a structural diagram of the driving unit in the present application;

[0039] Figure 7 is a diagram of the driving unit and the electric signal application method in the present application;

[0040] Figure 8 is a modal simulation diagram of the present application;

[0041] Figure 9 is a top view of the modal simulation of the present application;

[0042] Figure 10 is a schematic diagram of the material transport in the working state of the present application.

[0043] In the figure, 1 is the material tray, 2 is the top tray, 3 is the driving unit, 4 is the mass block, 5 is the bottom tray, 6 is the first spring sheet, 7 is the second spring sheet, 8 is the piezoelectric bimorph, 9 is the connecting block, 10 is the protrusion, 11 is the material outlet on the material tray, 12 is the rubber ring, and 13 is the base. EMBODIMENT

[0044] The technical solutions of the present application will be further described in detail below in combination with the drawings:

[0045] The present application can be implemented in many different forms, and should not be considered limited to the embodiments described herein. On the contrary, these embodiments are provided to make the present disclosure thorough and complete, and to fully convey the scope of the present application to those skilled in the art. In the drawings, the components are enlarged for clarity.

[0046] It should be understood that, although the terms first, second, third, etc. can be used herein to describe various elements, components, and / or parts, these elements, components, and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, and / or part from another. Therefore, a first element, component, and / or part discussed below could be termed a second element, component, or part without departing from the teachings of the present application.

[0047] As shown in Figure 1 The application discloses a rotary inertial drive piezoelectric vibration feeding device, which comprises a top disc, a material disc, a mass block, a bottom disc and N driving units, wherein N is a natural number greater than or equal to 3.

[0048] As shown in Figure 2 The material disc is a hollow cylinder with an open upper end and a closed lower end, and a material outlet is arranged on the side wall of the material disc.

[0049] As shown in Figure 3 The top disc is in the shape of a disc, and N first fixing seats corresponding to the driving units are uniformly arranged on the lower end surface of the top disc in the circumferential direction; and the upper end surface of the top disc is coaxially fixedly connected with the lower end surface of the material disc.

[0050] As shown in Figure 4 The mass block is an axisymmetric cylinder, and N second fixing seats corresponding to the driving units are uniformly arranged on the side wall of the mass block in the circumferential direction.

[0051] The bottom disc is in the shape of a ring, and N third fixing seats corresponding to the driving units are uniformly arranged on the upper end surface of the bottom disc in the circumferential direction.

[0052] As shown in Figure 6 The driving unit comprises a piezoelectric bimorph, a connecting block, a gasket, a first spring piece and a second spring piece.

[0053] The piezoelectric bimorph comprises a substrate, a first piezoelectric ceramic piece and a second piezoelectric ceramic piece, wherein the substrate is a rectangular plate; the first piezoelectric ceramic piece and the second piezoelectric ceramic piece are symmetrically pasted on the centers of the two sides of the substrate, are polarized along the thickness direction, and have the same polarization direction, as shown in Figure 7

[0054] The connecting block is fixedly connected with the lower end of the first spring piece, the upper end of the second spring piece and the lower end of the substrate of the piezoelectric bimorph respectively, so that the first spring piece, the second spring piece and the substrate of the piezoelectric bimorph are parallel to each other.

[0055] As shown in Figure 1 ​As shown, the N driving units are evenly arranged circumferentially between the top disc and the bottom disc, wherein the upper end of the first spring sheet and the corresponding first fixed seat are fixedly connected, the lower end of the second spring sheet and the corresponding third fixed seat are fixedly connected, and the upper end of the substrate of the piezoelectric bimorph and the corresponding second fixed seat are fixedly connected, so that the top disc, the mass block and the bottom disc are coaxial, and an included angle exists between the first spring sheet of the driving unit and the axis of the top disc.

[0056] As shown in the drawings, Figure 5 The application can further comprise a rubber ring and a base;

[0057] The upper end surface of the base is horizontally arranged, and a first annular groove matched with the rubber ring is arranged on the upper end surface;

[0058] All the second annular grooves matched with the rubber ring on the lower end surface of the bottom disc are coaxial with the bottom disc;

[0059] The rubber ring is arranged between the bottom disc and the base and is glued to the first annular groove and the second annular groove, respectively.

[0060] The rubber ring is glued to the first annular groove and the second annular groove by any one of silicone, polyurethane glue and modified epoxy glue, so that the vibration influence can be reduced.

[0061] As shown in the drawings, Figure 2 The upper end surface of the material disc is provided with a protrusion;

[0062] The protrusion is any one of a cone, a circular truncated cone or a cylinder, and the bottom surface of the protrusion is coaxially fixedly connected to the upper end surface of the material disc, so that a discharging groove is formed between the protrusion and the sidewall of the material disc;

[0063] The material outlet on the material disc is communicated with the discharging groove.

[0064] The base is provided with a plurality of through holes for disassembly.

[0065] The volume of the mass block can be changed to adjust the amplitude of the top disc and the frequency of the whole machine, and the mass block can increase the amplitude of the top disc, reduce the vibration transmitted to the base and improve the stability during material transportation.

[0066] The application further discloses a driving method of the rotary inertial driving piezoelectric vibration feeding device.

[0067] As shown in the drawings, Figure 7 The piezoelectric bimorphs on the N driving units are simultaneously applied with a sine alternating current signal of a preset frequency threshold, the piezoelectric bimorphs of the N driving units are excited to generate bending vibration modes under the excitation of the sine alternating current signal, and the first and second spring sheets are driven to generate bending vibration, and the top disc is driven to perform torsional vibration, Figure 8and Figure 9 As shown in the figure, due to the existence of the included angle between the first spring sheet of the driving unit and the axis of the top disc, the material tray fixed on the top disc produces a combined motion of torsion and vertical direction under the action of the top disc motion, so that the material in the material groove is conveyed under the action of inertia and friction, as shown in the figure. Figure 10

[0068] Those skilled in the art can understand that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with those in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless otherwise defined.

[0069] The above specific embodiments further illustrate the purposes, technical solutions and beneficial effects of the present application. It should be understood that the above description is only a specific embodiment of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.​

Claims

1. A rotary inertial-driven piezoelectric vibratory feeding device, characterized in that, It includes a top plate, a material plate, a mass block, a bottom plate, and N drive units, where N is a natural number greater than or equal to 3; The material tray is a hollow cylinder with an open top and a closed bottom, and its side wall is provided with a material outlet; The top plate is disc-shaped, and its lower end face is uniformly provided with N first fixed seats that correspond one-to-one with the driving unit. The upper end face is coaxially fixed to the lower end face of the material tray. The mass block is an axisymmetric cylinder, and its sidewalls are uniformly provided with N second fixing seats that correspond one-to-one with the driving unit. The chassis is circular in shape, and its upper surface is uniformly provided with N third fixing seats that correspond one-to-one with the drive unit; The driving unit includes a piezoelectric bicrystalline wafer, a connecting block, a pad, a first spring plate, and a second spring plate; The piezoelectric bicrystalline wafer includes a substrate, a first piezoelectric ceramic sheet, and a second piezoelectric ceramic sheet. The substrate is a rectangular plate. The first and second piezoelectric ceramic sheets are symmetrically attached to the center of both sides of the substrate, and are polarized along the thickness direction with the same polarization direction. The connecting block is fixedly connected to the lower end of the first spring sheet, the upper end of the second spring sheet, and the lower end of the substrate of the piezoelectric bicrystalline wafer, respectively, so that the first spring sheet, the second spring sheet, and the substrate of the piezoelectric bicrystalline wafer are parallel to each other. The N driving units are circumferentially and evenly arranged between the top plate and the bottom plate. The upper end of the first spring plate in the driving unit is fixed to its corresponding first fixed seat, the lower end of the second spring plate is fixed to its corresponding third fixed seat, and the upper end of the piezoelectric bicrystalline substrate is fixed to its corresponding second fixed seat, so that the top plate, the mass block, and the bottom plate are coaxial, and there is an included angle between the first spring plate of the driving unit and the axis of the top plate.

2. The rotary inertial driven piezoelectric vibration feeding device according to claim 1, characterized in that, It also includes a rubber ring and a base; The upper surface of the base is horizontally positioned, and it has a first annular groove that matches the rubber ring. All the second annular grooves on the lower end face of the chassis that match the rubber ring are coaxial with the chassis. The rubber ring is disposed between the chassis and the base, and is glued to the first annular groove and the second annular groove respectively.

3. The rotary inertial driven piezoelectric vibration feeding device according to claim 1, characterized in that, The upper surface of the material tray is provided with a protrusion; The protrusion is any one of a cone, a frustum, or a cylinder, and its bottom surface is coaxially fixed to the upper end surface of the material tray, so that a discharge groove is formed between the protrusion and the side wall of the material tray. The material outlet on the material tray is connected to the discharge chute.

4. The rotary inertial driven piezoelectric vibration feeding device according to claim 2, characterized in that, The base is provided with several through holes for disassembly.

5. The rotary inertial driven piezoelectric vibration feeding device according to claim 2, characterized in that, The rubber ring is connected to the first annular groove and the second annular groove by any one of silicone, polyurethane adhesive, or modified epoxy adhesive.

6. A driving method for the rotary inertial drive piezoelectric vibration feeding device according to claim 1, characterized in that, Includes the following steps: A sinusoidal alternating current signal with a preset frequency threshold is simultaneously applied to the piezoelectric bicrystalline wafers on N drive units. Under the excitation of the sinusoidal alternating current signal, the piezoelectric bicrystalline wafers of the N drive units are excited to generate bending vibration modes, which in turn drive their first and second spring plates to generate bending vibrations, thereby driving the top plate to perform torsional vibrations. Since there is an angle between the first spring plate of the drive unit and the axis of the top plate, the material tray fixed on the top plate generates a combined motion of torsion and vertical direction under the action of the top plate movement, so that the material in the trough is conveyed under the action of inertia and friction.

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