CN216632990U - Ultrasonic welding unit and welding device - Google Patents

Abstract

The utility model relates to an ultrasonic welding device, in particular to an ultrasonic welding unit and a welding device, wherein the ultrasonic welding unit comprises a welding body, at least one crystal stack is arranged in a first preset area on the welding body, a connecting unit is arranged in a second preset area on the welding body, a shell forms a cavity matched with the welding body, and the welding body is inserted in the shell so as to seal the crystal stack; the crystal pile comprises a locking bolt, wherein a transducer reflection block, at least one conductive copper sheet and at least one piezoelectric ceramic sheet are sequentially sleeved on the bolt, and the piezoelectric ceramic sheet and the conductive copper sheet are arranged adjacently.

Description

Ultrasonic welding unit and welding device

Technical Field

The present invention relates to an ultrasonic welding apparatus, and more particularly, to an ultrasonic welding unit and a welding apparatus.

Background

Ultrasonic welding is carried out by transmitting high-frequency vibration waves to the surfaces of two workpieces to be welded, and the surfaces of the workpieces are mutually rubbed under the action of ultrasonic waves to form fusion between molecular layers. The main components of a set of ultrasonic welding system comprise an ultrasonic generator, a transducer, an amplitude transformer and a welding head, wherein the transducer is used for performing electroacoustic conversion, the amplitude modulator is used for adjusting amplitude and providing a clamping position, and the welding head is used for contacting a welded product to perform welding. Each part has respective function, and the lack of one is not enough. Each component has a length of at least one half wave in the direction of vibration. For example, at a frequency of 20K, one ultrasonic welding unit has at least 3 half waves of a length of about 400 mm. Wherein each half wave is typically not less than 130 mm. The size of the mechanism is large compared with that of some automatic production lines, and the mechanism is not good for automatic integration.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the prior art, the utility model provides an ultrasonic welding unit and a welding device, and particularly comprises the following components:

in one aspect, the present application provides an ultrasonic welding unit comprising,

a welding body, at least one crystal pile is arranged in a first preset area on the welding body, a connecting unit is arranged in a second preset area on the welding body,

the shell forms a cavity matched with the welding body, and the welding body is inserted into the shell so as to seal the crystal stack;

the crystal pile comprises a locking bolt, wherein a transducer reflection block, at least one conductive copper sheet and at least one piezoelectric ceramic sheet are sequentially sleeved on the bolt, and the piezoelectric ceramic sheet and the conductive copper sheet are arranged adjacently.

Preferably, the ultrasonic welding unit further comprises a locking protrusion which is matched with the locking bolt and is arranged on the first predetermined region of the welding body.

Preferably, the ultrasonic welding unit further comprises a welding body, wherein the welding body is provided with three crystal piles.

Preferably, the ultrasonic welding unit further comprises a second predetermined region, wherein the second predetermined region is a region of the second wafer.

Preferably, in the ultrasonic welding unit, the number of the conductive copper sheets is the same as that of the piezoelectric ceramic sheets, and the conductive copper sheets are adjacent to the piezoelectric ceramic sheets.

Preferably, in the ultrasonic welding unit, the crystal stack includes four conductive copper sheets and four piezoelectric ceramic sheets.

Preferably, in the ultrasonic welding unit, the welding body further includes a welding end portion, and the welding end portion is disposed at an end portion of the welding body and is far away from the first predetermined region.

On the other hand, this application provides a welding set again, wherein, include any one above-mentioned ultrasonic welding unit, still include a voltage positive pole signal connecting wire and a voltage negative pole signal connecting wire, voltage positive pole signal connecting wire connects a conductive copper piece, voltage negative pole signal connecting wire connects a conductive copper piece, the piezoceramics piece sets up between voltage positive pole signal connecting wire and voltage negative pole signal connecting wire.

The utility model has at least the following beneficial effects:

the piezoelectric ceramic wafer and the conductive copper sheet are adjacently stacked together. And then a cylindrical reflecting block is locked at the cylindrical end of the welding head body together with the piezoelectric ceramic wafer and the conductive copper sheet through a locking bolt. Depending on the width of the horn, one or more ceramic boules may be used to directly lock onto the emitter end of the horn body. Thus, the piezoelectric ceramic can be directly transmitted to the welding end of the welding head by converting the electric energy into the mechanical energy. The whole transducer structure is omitted, only the core piezoelectric ceramics are directly fixed on the welding head body, and the middle amplitude modulator part is also removed. At the node of the welding head where the section varies in the middle, there are four symmetrical projections, which, because of the nodes of vibration, have a very low amplitude and are therefore used to fix the housing of the entire welding unit. The welding unit shell is a square cover, and is locked at four bulges of the welding head by screws, so that the whole welding unit is integrated. The upper side surface and the rear surface of the shell are respectively provided with a power supply contact point which is respectively connected with the anode and the cathode of a power supply. The anode is connected with one group of conductive copper sheets on one side of each ceramic crystal stack, and the cathode is connected with the other group of adjacent conductive copper sheets. Thus, the whole welding unit is input by the electric energy of the shell end, and the ultrasonic wave of the welding head end is output. Forming a self-contained compact ultrasonic welding unit.

Drawings

FIG. 1 is a schematic structural view of an ultrasonic welding unit according to the present invention;

FIG. 2 is a schematic structural view of an ultrasonic welding unit according to the present invention;

fig. 3 is a schematic structural diagram of a welding device provided by the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

Example one

As shown in fig. 1-2, an ultrasonic welding unit, comprising,

the welding body 1 is provided with at least one crystal pile 11 in a first preset area on the welding body 1, a connecting unit 12 is arranged in a second preset area of the welding body 1,

the shell 2 forms a cavity matched with the welding body 1, and the welding body 1 is inserted into the shell 2 so that the crystal stack 11 is closed;

the crystal stack 11 comprises a locking bolt 114, a transducer reflection block 13, at least one conductive copper sheet 111 and at least one piezoelectric ceramic sheet 112 are sequentially sleeved on the bolt 114, the piezoelectric ceramic sheet 112 and the conductive copper sheet 111 are arranged adjacently, and a locking protrusion 14 matched with the locking bolt 114 is arranged in a first preset area of the welding body 1.

The shell 2 is a square cover and is locked at four bulges of the welding head by screws, and the whole welding unit is integrated. The upper side surface and the rear surface of the shell are respectively provided with a power supply contact point which is respectively connected with the anode and the cathode of a power supply. The positive electrode is connected with the conductive copper sheet 111 on one side of the crystal pile 11, and the negative electrode is connected with the conductive copper sheet 111 on the other side. Thus, the whole welding unit is input with electric energy from the shell end, and ultrasonic waves are output from the welding head end, so that an independent and compact ultrasonic welding unit is formed.

The working principle of the ultrasonic welding unit is as follows: the positive electrode is connected with the conductive copper sheet 111 on one side of the crystal pile 11, the negative electrode is connected with the conductive copper sheet 111 on the other side, in a power-on state, the shape of the piezoelectric ceramic sheet 112 changes (piezoelectric effect of the piezoelectric ceramic) under the action of an electric energy signal, the piezoelectric ceramic sheet is combined with the transducer reflection block 13 to convert the electric energy into mechanical energy, the mechanical energy is transmitted to the welding end part 13 of the welding body 1, and the welding end part 13 enables mutual friction heating between welding workpieces under the action of high-frequency mechanical energy to achieve the purpose of welding. The ultrasonic welding unit omits the whole transducer structure, only keeps the core piezoelectric ceramics directly fixed on the welding head body, and also removes the middle amplitude modulator part. The size of the product is reduced to about 1/2. Therefore, the space is saved, the ultrasonic welding device can be integrated into a plurality of automatic devices which cannot be integrated before, and the application range of ultrasonic welding is expanded.

As a further preferred embodiment, in the ultrasonic welding unit described above, the crystal stack 11 includes four conductive copper sheets 111 and four piezoelectric ceramic sheets 112, and the conductive copper sheets 111 and the piezoelectric ceramic sheets 112 are adjacently disposed. The piezoelectric ceramic wafer and the conductive copper sheet 111 are stacked adjacent to each other. A transducer reflector block is then fitted over the lock bolt 114 to be secured to the cylindrical end of the weld head body.

Depending on the width of the horn, one or more ceramic boules 11 may be used to directly lock onto the emitter end of the horn body. So that the piezoelectric ceramic is converted from electrical energy to mechanical energy and can be directly transferred to the welding tip 13. It should be noted that: the number of the stacks 11 is matched to the length of the welding end 13, in order to ensure that the stacks 11 do not interfere with each other.

As a further preferred embodiment, in the ultrasonic welding unit described above, the welding body 1 includes a welding end 13, and the welding end 13 is disposed at an end of the welding body 1 and is far away from the first predetermined region. The first predetermined region is the other end portion away from the welding end portion 13. Further, the welding end portion 13 is further provided with a plurality of welding head grooves 131. For improved horn end amplitude uniformity.

As a further preferred embodiment, in the ultrasonic welding unit described above, the second predetermined region is located on the welding head, and the vibration amplitude of the second predetermined region is the smallest. It is also understood that the second predetermined region is located in the vibration nodal region where the amplitude of vibration during welding is extremely small and where stability is relatively high. The connecting unit 12 is used for connecting the housing 2. Further, the connecting unit 12 is four symmetrical protrusions.

Example two

As shown in fig. 3, a welding device includes an ultrasonic welding unit 100 as described in any one of the above embodiments, and further includes a voltage positive signal connection wire 31 and a voltage negative signal connection wire 32, the voltage positive signal connection wire is connected to a conductive copper sheet, the voltage negative signal connection wire is connected to a conductive copper sheet, and the piezoelectric ceramic sheet is disposed between the voltage positive signal connection wire and the voltage negative signal connection wire.

The working principle of the welding device is the same as that of the ultrasonic welding unit provided in the first embodiment, and details are not described here.

In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent alternatives or modifications according to the technical solution of the present invention and the inventive concept thereof should be covered by the scope of the present invention.

Claims (8)

1. An ultrasonic welding unit, comprising,

a welding body, at least one crystal pile is arranged in a first preset area on the welding body, a connecting unit is arranged in a second preset area of the welding body,

the shell forms a cavity matched with the welding body, and the welding body is inserted into the shell so as to seal the crystal stack;

the crystal pile comprises a locking bolt, wherein a transducer reflection block, at least one conductive copper sheet and at least one piezoelectric ceramic sheet are sequentially sleeved on the bolt, and the piezoelectric ceramic sheet and the conductive copper sheet are arranged adjacently.

2. An ultrasonic welding unit according to claim 1, characterized in that the first predetermined area of the welding body is provided with a locking projection matching the locking bolt.

3. An ultrasonic welding unit according to claim 1, characterized in that the welding body is provided with three crystal stacks.

4. The ultrasonic welding unit of claim 1, wherein the number of die stacks matches the length of the first predetermined area.

5. The ultrasonic welding unit of claim 1, wherein the number of the conductive copper sheets and the piezoelectric ceramic sheets are the same, and the conductive copper sheets and the piezoelectric ceramic sheets are adjacently disposed.

6. The ultrasonic welding unit of claim 1, wherein the die stack comprises four conductive copper sheets and four piezoceramic sheets.

7. The ultrasonic welding unit of claim 1, wherein the welding body further comprises a welding tip disposed at an end of the welding body distal from the first predetermined area.

8. A welding device, comprising the ultrasonic welding unit of any one of claims 1 to 7, further comprising a voltage positive signal connection wire and a voltage negative signal connection wire, wherein the voltage positive signal connection wire is connected with a conductive copper sheet, the voltage negative signal connection wire is connected with a conductive copper sheet, and the piezoelectric ceramic sheet is arranged between the voltage positive signal connection wire and the voltage negative signal connection wire.

Images