CN2736311Y - Floating type piezoelectric oscillatory screw feeding device - Google Patents

Abstract

The utility model relates to an oscillatory feeding device, in particular to a floating type piezoelectric oscillatory screw feeding device, comprising a material tray whose inside is provided with screw slideways, an oscillatory device which comprises elastic elements which are plastered with piezoelectric ceramic pieces and an alternating current power supply connected with the piezoelectric ceramic pieces and a base. The lower end of the material tray is fixed to a round supporting board via a deltoid pillar, and the three elastic elements plastered with piezoelectric ceramic pieces are respectively arranged on the three side faces of the deltoid pillar via small supporting boards which are of leaf wing type, forming an angle with the normal plane. A bottom tray with a U groovy is fixed on the base, rollers are placed in the U groovy, and the round supporting board is arranged on the rollers. Two positioning screw nails fixed on the bottom tray are respectively inserted into two positioning holes on the round supporting board. The elastic elements of the device bear the weight of the material tray and materials no longer, thus improving the service life of the elastic elements and transfer efficiency and reducing the energy consume.

Description

Floating piezoelectric vibrating screw feeding device

technical field

The utility model relates to a vibration feeding device, in particular to a vibration feeding device driven by piezoelectricity.

Background technique

With the rapid development of semi-automatic and automatic production of products, it is very important to develop semi-automatic and automatic conveying equipment as a perfect product.

The traditional vibrating feeding device can generally be divided into two types in structure, one is a straight feeding device, and the other is a screw feeding device. The vast majority of spiral vibrating feeding devices are electromagnetically driven. At present, piezoelectrically driven spiral vibrating feeding devices have also appeared. 4 and the vibrating device and the base 11 formed by connecting the AC power supply of the piezoelectric ceramic sheet 3. The upper end of the elastic element 4 is fixed on the charging tray 1, and its lower end is fixed on the base 11. The elastic element 4 is made of metal material with good elasticity. The elastic element 4 has two functions, one is to cooperate with the piezoelectric ceramic sheet 3 to make the tray 1 generate micro-amplitude torsional vibration under the excitation of alternating current; the other is to support the tray 1.

When an alternating current is applied to the piezoelectric ceramic sheet 3, the piezoelectric ceramic sheet 3 is deformed, which drives the obliquely installed elastic element 4 to vibrate regularly. The spiral groove on the inner wall of 1 moves upwards, and then enters the feeding trough from the discharge port on the upper part of the tray 1, and is sent to the processing position.

This piezoelectric-driven spiral vibrating feeding device has the advantages of simple structure, low noise and durability, but it has the following disadvantages:

1. The vibration device composed of elastic elements and piezoelectric ceramic sheets is used to vibrate under the excitation of alternating current and to support the material tray, so the gravity of the material and the material tray acts on the elastic element for a long time. It will lead to large or small deformation of the elastic element, which will further affect the vibration performance of the piezoelectric ceramic sheet attached to it, and the force of the elastic element is complicated. These factors have a great influence on the vibration stability of the device. In addition, the long-term stress on the elastic element is also easy to cause fatigue fracture.

2. The upper end of the vibrating device of the device is fixed on the tray, and the lower end is fixed on the base. This fixing method will restrain the torsional vibration of the tray and limit the movement of the tray.

3. The vibration of the piezoelectric ceramic sheet must not only overcome the fixed constraints of the vibration device, but also overcome the force on the vibration device itself, so the energy consumption of the piezoelectric ceramic sheet is relatively large.

Contents of the invention

The purpose of this utility model is to provide a floating piezoelectric vibrating screw feeding device with an improved structure, so as to overcome the above-mentioned shortcomings existing in the current device.

The utility model floating piezoelectric vibrating screw feeding device includes a material tray with a spiral slideway inside, a vibrating device and a base composed of an elastic element pasted with a piezoelectric ceramic sheet and an AC power supply connected to the piezoelectric ceramic sheet. In that: the lower end of the tray is fixedly connected to a circular support plate through triangular pillars, and the three elastic elements pasted with piezoelectric ceramic sheets are arranged on the triangular pillars in the form of leaf fins through small support plates. On the three sides, and form a certain angle with the vertical plane; a chassis with a U-shaped groove is fixed on the base, and balls are placed in the U-shaped groove. The circular support plate is seated on the balls, and the fixed The two limit screws on the chassis are respectively inserted into the two limit holes on the circular support plate.

The utility model has the following advantages:

1. This device adopts a material tray with triangular pillars and a circular support plate. This structure makes the elastic element no longer bear the weight of the material tray and the material, and is only used to cooperate with the piezoelectric film to generate vibration, thereby eliminating the need for the material tray The impact of the weight of the material on the vibration of the piezoelectric ceramic sheet and the elastic element increases the life of the elastic element.

2. This device adopts the structure of floating tray, which eliminates the constraints caused by the fixing of elastic elements on the tray and the base, and the overall vibration of the tray is more sufficient, thereby improving the conveying efficiency (the current piezoelectric It is several times or even ten times that of the driven spiral vibration feeding device), and reduces the energy consumption (less than 1/2 of the current piezoelectric vibrating hopper).

The utility model is especially suitable for conveying various solid particles and powder materials such as corn, wheat, rice, soil, small electronic mechanical devices, etc., such as a feeding device for variable fertilizer feeding of a variable fertilizer spreader.

Description of drawings

Below in conjunction with the embodiment that accompanying drawing provides, the utility model structure is described in further detail.

Fig. 1 is the structure schematic diagram of the utility model floating piezoelectric vibrating screw feeding device;

Fig. 2 is a structural schematic diagram of a vibrating feeding device driven by a spiral piezoelectric drive at present.

Detailed ways

Referring to Fig. 1, the floating piezoelectric vibrating screw feeding device of the present invention includes a material tray 1 with a spiral slideway inside, an elastic element 4 pasted with a piezoelectric ceramic sheet 3 and an AC power supply connected to the piezoelectric ceramic sheet 3 The vibrating device and the base 9 are characterized in that: the lower end of the tray 1 is fixedly connected to a circular support plate 6 through a triangular pillar 2, and the three elastic elements 4 pasted with piezoelectric ceramic sheets 3 pass through the The small support plate 5 is arranged on the three sides of the triangular pillar 2 in the form of a leaf fin, and forms a certain angle with the vertical plane; a chassis 8 with a U-shaped groove is fixed on the base 9, and the U-shaped The ball 7 is placed in the shaped groove, the circular support plate 6 sits on the ball 7, and the two limit screws 10 fixed on the chassis 8 are respectively inserted in the two limit holes on the circular support plate 6.

The matching gap between the limit screw 10 and the upper limit hole of the circular support plate 6 is 1-3 mm. In this way, it is possible to ensure that the torsional vibration of the tray 1 in the horizontal direction is not restricted, and at the same time ensure that the tray 1 as a whole is in a floating state in the vertical direction, which is convenient for vibration.

Claims (2)

1. floating type piezoelectric vibration spiral feeder, comprise that the inboard has the charging tray of spiral slide (1), by the elastic element that is pasted with piezoelectric ceramic piece (3) (4) with connect the oscillatory system that the source of AC of piezoelectric ceramic piece (3) is formed, base (9), it is characterized in that: the lower end of described charging tray (1) is by triangular pillar (2) circular base slab (6) that is connected, three described elastic elements (4) that are pasted with piezoelectric ceramic piece (3) are on three sides that are arranged on triangular pillar (2) of leaf wing formula by little stay bearing plate (5) respectively, and angled with vertical surface; On described base (9), set firmly a chassis (8) with U-lag, in its U-lag, place ball (7), circular base slab (6) is sat and to be put on ball (7), is installed in two stop screws (10) on the chassis (8) and is inserted in respectively in two spacing holes on the circular base slab (6).

2, floating type piezoelectric vibration spiral feeder according to claim 1 is characterized in that the tolerance clearance between described stop screw (10) and circular base slab (6) the upper limit hole is 1-3mm.