CN115817931A - Ultrasonic sealing device and filling equipment - Google Patents

Abstract

The invention provides an ultrasonic sealing device and filling equipment. The ultrasonic sealing device comprises a converter and an anvil block, wherein the converter comprises a shell and a welding head arranged in the shell, the shell comprises a shell end face, the welding head comprises a vibration applying face, the anvil block comprises an anvil block abutting end arranged opposite to the welding head and the shell end face, and the vibration applying face extends out of the shell end face so that pressure is concentrated on the vibration applying face in the process of pressurizing and packaging the packaging material.

Description

Ultrasonic sealing device and filling equipment

technical field

The invention relates to the field of filling and sealing, in particular to an ultrasonic sealing device and filling equipment.

Background technique

At present, the sealing of liquid packaging containers made of multi-layer packaging materials commonly used in the market is mostly traditional electric heating direct heat conduction sealing and high-frequency induction heating sealing. Traditional electric heating has low heating efficiency, high energy consumption, and is easy to cause damage to the packaging surface. The traditional high-frequency induction heating method can only be applied to multi-layer packaging materials with metal (aluminum foil), and packaging materials with metal (aluminum foil) are technically difficult to recycle and cannot be completely recycled. Ultrasonic sealing technology has more application prospects because it is applicable to multi-layer packaging materials with metal (aluminum foil) and multi-layer packaging materials without metal (aluminum foil), and has a long service life.

However, due to the low sealing pressure per unit area, the current ultrasonic sealing method is prone to problems such as poor sealing and leakage.

Contents of the invention

In order to solve the above problems, the present invention provides an ultrasonic sealing device and filling equipment.

The purpose of the present invention is mainly realized by the following technical solutions:

In the first aspect, some embodiments of the present invention provide an ultrasonic sealing device, including a converter and an anvil, the converter includes a housing and a welding head arranged inside the housing, the housing includes an end surface of the housing, and the welding head includes a vibration application surface The anvil includes an anvil abutting end opposite to the welding head and the end surface of the shell, and the vibration application surface extends out of the end surface of the shell, so that the pressure is concentrated on the vibration application surface during the process of pressurizing the packaging material.

In some embodiments, the distance between the plane where the vibration application surface is located and the plane where the end surface of the housing is located is greater than or equal to 1.4 mm.

In some embodiments, the anvil abutment end includes an anvil ridge disposed opposite the vibration application surface and extending out of the anvil abutment end.

In some embodiments, the anvil ridge is cylindrical.

In some embodiments, the welding head is provided with a rear end of the welding head opposite to the vibration application surface, and the rear end of the welding head is further connected to the first elastic member.

In some embodiments, the first elastic member is a spring or an elastic washer.

In some embodiments, the part of the abutting end of the anvil that is opposite to the end surface of the housing is a chamfered structure.

In some embodiments, the number of chamfered structures is one or two.

In some embodiments, the anvil is provided with a rear end of the anvil opposite to the abutting end of the anvil, and the rear end of the anvil is provided with a second elastic member.

In some embodiments, the ultrasonic sealing device further includes a cutting rail abutting against the anvil via the second elastic member.

In some embodiments, the elastic member is a spring or an elastic washer.

In some embodiments, the vibration frequency of the welding head is greater than or equal to 20KHz and less than or equal to 30KHz. In the second aspect, some embodiments of the present invention provide a filling device, including the ultrasonic sealing device of any one of the above embodiments.

The beneficial effects of the present invention are: since the vibration application surface extends out of the end face of the shell, the end face of the shell is far away from the abutting end of the anvil when the ultrasonic sealing device pressurizes and seals the packaging material, and the pressure generated during the sealing process can neither It is directly transmitted from the abutting end of the anvil to the end face of the shell, and the pressure cannot be transmitted from the abutting end of the anvil to the end face of the shell through the packaging material. Therefore, the sealing pressure can be increased without changing the clamping pressure of the existing ultrasonic sealing device. Concentrate on the vibration application surface to effectively increase the sealing pressure per unit area, thereby improving the sealing reliability and effectively reducing the problems of leakage and poor sealing.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings used in the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For Those skilled in the art can also obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic cross-sectional structure diagram of an ultrasonic sealing device according to some embodiments of the present invention;

Fig. 2 is a partial structural schematic diagram of the shell and the welding head of the ultrasonic sealing device according to some embodiments of the present invention;

Fig. 3 is a schematic structural view of a filling device according to some embodiments of the present invention.

Explanation of reference signs:

Ultrasonic sealing device 1, filling equipment 2, converter 11, housing 111, housing end surface 111a, welding head 112, vibration application surface 112a, welding head rear end 112b, anvil 12, anvil contact end 121, anvil ridge 121a , chamfering structure 121b, anvil rear end 122, ultrasonic vibrator 14, first elastic member 13a, second elastic member 13b, cutting rail 15, cutter 151, packaging material A, liquid content B.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, or in a specific orientation. construction and operation, therefore, should not be construed as limiting the invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as there is no conflict with each other.

As shown in FIG. 1 , the present invention provides an ultrasonic sealing device 1 , which at least includes an ultrasonic vibrator 14 , a converter 11 and an anvil 12 . The converter 11 includes a housing 111 and a welding head 112 arranged inside the housing 111, the housing 111 includes a housing end surface 111a, the welding head 112 includes a vibration application surface 112a, and the anvil 12 includes an anvil opposite to the welding head 112 and the housing end surface 111a The seat abuts against the end 121 . During work, the vibration application surface 112a of the horn 112 and the abutting end 121 of the anvil clamp the packaging material A, and the ultrasonic vibrator 14 provides power to drive the horn 112 in the converter 11 to produce ultrasonic vibrations, so that the vibration application surface 112a and the The packaging material A between the abutting ends 121 of the anvil melts, thereby realizing the sealing of the packaging material A, and the cutter 151 in the cutting rail 15 cuts the sealed packaging material A to form an independent package for encapsulating the liquid content B .

It should be noted that since the ultrasonic working frequency is too low to melt the packaging material A, the vibration frequency of the welding head 112 provided by the present invention is greater than or equal to 20KHz and less than or equal to 30KHz, such as 23KHz, 25KHz, 28KHz, so as to realize the melting and sealing of the packaging material A. combine.

In some embodiments, the vibration application surface 112a extends beyond the housing end surface 111a, which can be realized by setting a longer welding head 112 or a shorter housing 111, so that the vibration application surface 112a protrudes relative to the housing end surface 111a. Therefore, when the ultrasonic sealing device 1 pressurizes and seals the packaging material A, the end surface 111a of the shell is far away from the abutting end 121 of the anvil, and the pressure generated during the sealing process cannot be directly transmitted from the abutting end 121 to the abutting end of the anvil. The pressure on the end face 111a of the shell cannot be transmitted from the abutting end 121 of the anvil through the packaging material A to the end face 111a of the shell. Therefore, without changing the clamping pressure of the existing ultrasonic sealing device 1, the sealing pressure can be concentrated on the vibration application surface 112a to effectively increase the sealing pressure per unit area, thereby improving the sealing reliability and effectively reducing leak seals. and poor sealing problems. It should be noted that, in the present invention, the vibration application surface 112a extends beyond the housing end surface 111a, which means that the vibration application surface 112a of the ultrasonic sealing device 1 extends beyond the housing end surface 111a in any state. However, the welding head of the ultrasonic sealing device in the related art vibrates on both sides of the end face of the shell, that is, the welding head extends out of the end face of the shell part of the time, and does not extend out of the end face of the shell part of the time, which will still cause the end face of the shell to bear pressure, and it is difficult to solve the leak seal. and poor sealing problems.

Fig. 2 is a partial structural diagram of the shell and the welding head of the ultrasonic sealing device according to some embodiments of the present invention. As shown in Figure 2, in some embodiments, the distance d between the plane where the vibration application surface 112a is located and the plane where the housing end surface 111a is located is greater than or equal to 1.4mm, such as 2mm, 3mm, 4mm, 5mm, 6mm, the specific distance It is not limited here, and can be adjusted according to the thickness of the packaging material A to be sealed. When the packaging material A is thinner, the distance d between the plane where the vibration application surface 112a is located and the plane where the end surface 111a of the housing is located is shorter. When the packaging material A is composed of composite multi-layer materials, the distance d between the plane where the vibration application surface 112a is located and the plane where the end surface 111a of the housing is located is longer. On the one hand, it ensures that during the sealing process, the pressure generated by the vibration will not be applied to the end surface 111a of the shell, but concentrated on the vibration application surface 112a, effectively increasing the sealing pressure per unit area, thereby improving the sealing reliability. Effectively reduce the problems of leakage and poor sealing. On the other hand, there is no pressure on the end surface 111a of the housing, which reduces damage to the material of the housing 111 and prolongs the service life of the ultrasonic sealing device 1 .

In some embodiments, the welding head 112 is provided with a welding head rear end 112b opposite to the vibration application surface 112a, and the welding head rear end 112b can be further connected to the first elastic member 13a. Specifically, the rear end 112b of the welding head is fixedly connected to the first elastic member 13a by means of bonding, welding, etc., and the specific connection method is not limited here. Since the welding head 112 may be loosened during the vibration process, the position of the abutting end 121 relative to the anvil changes beyond the allowable error range, resulting in uneven pressure distribution and affecting the sealing effect. When the first elastic member 13a is connected to the rear end 112b of the welding head, the welding head 112 is loose, and the position of the rear end 112b of the welding head changes beyond the allowable error range and when the first elastic member 13a is compressed and deformed, the return of the first elastic member 13a The elastic force drives the anvil 12 to reset, ensures uniform pressure, and improves the stability of the ultrasonic sealing device 1 . In some embodiments, the first elastic member 13a may be a spring or an elastic washer. In some embodiments, the first elastic member 13a is a spring, and the number of springs may be one or more, and it is enough to distribute evenly on the rear end 112b of the welding head, and the specific number is not limited. In some embodiments, the first elastic member 13a is an elastic gasket, and its constituent materials can be metal, rubber and/or silicone, and the proportion of each component is adjusted according to actual needs, which is not limited here.

In some embodiments, the anvil abutment end 121 includes an anvil ridge 121 a disposed opposite to the vibration application surface 112 a and extending out of the anvil abutment end 121 . Since the anvil ridge 121a extends out of the abutting end and is arranged opposite to the vibration application surface 112a, during the sealing process, the vibration pressure actually concentrates on the vibration application surface 112a and the anvil ridge 121a, further increasing the sealing pressure per unit area and improving The sealing performance of the ultrasonic sealing device 1 is improved.

In some embodiments, the anvil ridge 121a can be polyhedral, tooth-shaped, belt-shaped or cylindrical, preferably cylindrical, so as to further reduce the contact area between the anvil ridge 121a and the packaging material A, and increase the sealing pressure per unit area . Setting the anvil ridge 121a in a cylindrical shape not only reduces the contact area between the anvil ridge 121a and the packaging material A, but at the same time, when the vibration application surface 112a and the anvil ridge 121a are misaligned and not facing directly, the contact area between the anvil ridge 121a and the packaging material A The area remains unchanged, which ensures the stability of sealing, stable packaging quality, and is conducive to continuous production.

In some embodiments, the part of the anvil abutting end 121 opposite to the housing end surface 111a is a chamfered structure 121b, which further increases the distance between the anvil abutting end 121 and the vibration application surface 112a. When the vibration application surface 112a is misaligned with the anvil ridge 121a and does not face directly, due to the existence of the chamfer structure 121b, the two sides of the anvil abutting end 121 are far away from the vibration application surface 112a and the shell end surface 111a and will not contact. The force applied by the vibration is still concentrated on the vibration applied surface 112a without being lost on the end surface 111a of the housing. At the same time, due to the existence of the chamfered structure 121b, even if the vibration application surface 112a is misaligned with the anvil ridge 121a and is not facing directly, there is enough distance between the abutting end 121 of the anvil and the end surface 111a of the housing to move, so the anvil ridge 121a does not It will be away from the vibration application surface 112a, which ensures the stable operation of the ultrasonic sealing device 1, improves the fault tolerance rate, and is beneficial to continuous production.

In some embodiments, the number of chamfered structures 121b may be one or more. When the number of chamfers is one, the vibration application surface 112a and the anvil ridge 121a can be misaligned on one side without affecting the sealing pressure. When the number of chamfers is two, the vibration application surface 112a and the anvil ridge 121a can be misaligned on opposite sides without affecting the sealing pressure.

It should be noted that although the chamfering can prevent the sealing pressure from decreasing when the vibration application surface 112a and the anvil ridge 121a are misaligned. When the degree of misalignment is small or the distance between the end surface 111 a of the housing and the abutting end 121 of the anvil is far enough, the sealing pressure of the ultrasonic sealing device 1 will not be reduced without chamfering.

In some embodiments, the anvil 12 is provided with an anvil rear end 122 opposite to the anvil abutting end 121 , and the anvil rear end 122 may further be provided with a second elastic member 13b. Specifically, the rear end 122 of the anvil can be fixedly connected to the second elastic member 13b by bonding, welding, etc., and the specific connection method is not limited here.

In some embodiments, the ultrasonic sealing device 1 further includes a cutting rail 15, and the cutting rail 15 abuts against the anvil 12 through the second elastic member 13b. Since the anvil 12 may become loose during the vibration process, the position change relative to the vibration application surface 112a exceeds the allowable error range, resulting in uneven pressure distribution and affecting the sealing effect. The second elastic member 13b is arranged between the cutting rail 15 and the abutting anvil 12. When the position of the anvil 12 changes beyond the allowable error range and compresses the second elastic member 13b to deform, the resilience of the second elastic member 13b drives the The anvil 12 is reset to ensure uniform pressure and improve the stability of the ultrasonic sealing device 1 .

In some embodiments, the second elastic member 13b may be a spring or an elastic washer. In some embodiments, the second elastic member 13b is a spring, and the number of springs may be one or more, and it only needs to be evenly distributed between the rear end 122 of the anvil and the cutting rail 15, and the specific number is not limited. In some embodiments, the second elastic member 13b is an elastic gasket, and its constituent material can be metal, rubber and/or silicone, and the proportion of each component is adjusted according to actual needs, which is not limited here.

In addition, as shown in FIG. 3 , the present invention also provides a filling device 2 , which includes the ultrasonic sealing device 1 of any of the above-mentioned embodiments, and can realize continuous production of liquid packaging.

To sum up, the present invention provides an ultrasonic sealing device and filling equipment. During the process of pressurizing and sealing packaging materials, the end face of the shell of the ultrasonic sealing device is far away from the abutting end of the anvil. The pressure cannot be directly transmitted from the abutting end of the anvil to the end surface of the housing, nor can the pressure be transmitted from the abutting end of the anvil to the end surface of the housing through the packaging material. Therefore, without changing the clamping pressure of the existing ultrasonic sealing device, the sealing pressure can be concentrated on the vibration-applied surface, and the sealing pressure per unit area can be effectively increased, thereby improving the sealing reliability and effectively reducing leakage and sealing. bad fit problem.

The term "and/or" in this article is just an association relationship describing associated objects, which means that there can be three relationships, for example, A and/or B can mean: A exists alone, A and B exist simultaneously, and there exists alone B these three situations. In addition, the character "/" in this article generally indicates that the contextual objects are an "or" relationship. In addition, "many" herein means two or more than two. In addition, the term "at least one" herein means any one of a variety or any combination of at least two of the more, for example, including at least one of A, B, and C, which may mean including from A, Any one or more elements selected from the set formed by B and C.

The above-mentioned embodiments only express several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but should not be construed as limiting the patent scope of the invention. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (13)

1. An ultrasonic sealing device, characterized in that it comprises a converter and an anvil, the converter comprises a shell and a horn arranged inside the shell, the shell comprises an end face of the shell, and the horn comprises a vibration applying surface, the anvil includes an anvil abutment end disposed opposite to the welding head and the end surface of the housing, and the vibration application surface extends out of the end surface of the housing so that during the process of pressurizing the packaging material, the pressure Concentrate on the vibration application surface. 2 . The ultrasonic sealing device according to claim 1 , wherein the distance between the plane where the vibration application surface is located and the plane where the end surface of the housing is located is greater than or equal to 1.4 mm. 3. The ultrasonic sealing device according to claim 1, characterized in that, the abutting end of the anvil includes an anvil ridge, the anvil ridge is arranged opposite to the vibration application surface, and extends out of the anvil abutment end. 4. The ultrasonic sealing device according to claim 3, wherein the anvil ridge is cylindrical. 5. The ultrasonic sealing device according to any one of claims 1-4, characterized in that, the welding head is provided with a welding head rear end opposite to the vibration application surface, and the welding head rear end is further Attach the first elastic. 6. The ultrasonic sealing device according to claim 5, wherein the first elastic member is a spring or an elastic washer. 7. The ultrasonic sealing device according to any one of claims 1-4, characterized in that, the part of the abutting end of the anvil that is opposite to the end face of the housing is a chamfered structure. 8. The ultrasonic sealing device according to claim 7, characterized in that, the number of the chamfering structures is one or two. 9. The ultrasonic sealing device according to any one of claims 1-4, characterized in that, the anvil is provided with an anvil rear end opposite to the anvil abutment end, and the anvil rear end is A second elastic member is provided. 10 . The ultrasonic sealing device according to claim 9 , further comprising a cutting rail, and the cutting rail abuts against the anvil through the second elastic member. 11 . 11. The ultrasonic sealing device according to claim 9, wherein the second elastic member is a spring or an elastic washer. 12. The ultrasonic sealing device according to any one of claims 1-4, wherein the vibration frequency of the welding head is greater than or equal to 20KHz and less than or equal to 30KHz. 13. A filling device, characterized by comprising the ultrasonic sealing device according to any one of claims 1-12.

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