CN112912233A - 超声波密封设备 - Google Patents

超声波密封设备 Download PDF

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CN112912233A
CN112912233A CN201980070443.9A CN201980070443A CN112912233A CN 112912233 A CN112912233 A CN 112912233A CN 201980070443 A CN201980070443 A CN 201980070443A CN 112912233 A CN112912233 A CN 112912233A
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housing
ultrasonic sealing
sealing device
absorber
ultrasonic
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法比奥·索奇
卢卡·根蒂利
法布里齐奥·西吉诺尔菲
马西米利亚诺·巴尔比
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Tetra Laval Holdings and Finance SA
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/10—Applying or generating heat or pressure or combinations thereof
    • B65B51/22—Applying or generating heat or pressure or combinations thereof by friction or ultrasonic or high-frequency electrical means, i.e. by friction or ultrasonic or induction welding
    • B65B51/225—Applying or generating heat or pressure or combinations thereof by friction or ultrasonic or high-frequency electrical means, i.e. by friction or ultrasonic or induction welding by ultrasonic welding
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    • B29C66/7234—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a barrier layer
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    • B29C66/82263—Follower pin or roller cooperating with a groove
    • B—PERFORMING OPERATIONS; TRANSPORTING
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Abstract

公开了一种超声波密封设备(100)，其包括用于密封包装材料的超声焊极(101)，该超声焊极(101)包括压电换能器(102)以生成用于所述密封的超声波声振动；壳体(103)；连接到压电换能器(102)的功率电路(104)，其中功率电路(104)被封装在壳体(103)中；以及吸收器(105)，其布置在壳体(103)中以吸收其中的大气中的湿气以降低湿度。还公开了一种控制超声波密封设备(100)中的湿度的方法(200)。

Description

超声波密封设备
技术领域
本发明涉及一种用于密封包装容器的设备。更具体地，本发明涉及一种用于密封用于这种包装容器的包装材料的超声波密封设备，以及一种在这种超声波密封设备中控制湿度的方法。
背景技术
在包装容器的制造中，包装材料的卷材通常被纵向密封以在填充机中围绕填充管形成管。对该管进行横向密封，然后用所需的液体食品填充该管。制成第二横向密封件，其也从材料的整个管上切下包装。然后将填充的包装折叠并成形以获得最终的包装容器。对于这种密封使用不同的密封方法，例如感应密封或超声波密封。包装材料通常由两面都涂覆有热塑性树脂材料(例如聚乙烯)的纸板基材组成。另外，纸板基材可以具有阻气层，该阻气层也可以涂覆有热塑性树脂材料。在超声波密封中，超声能量通过将振动从超声变幅杆传递到包装材料而在热塑性树脂材料中生成热量。热塑性树脂熔化，并且包装材料的相对表面在朝向彼此按压时被密封在一起。超声波密封系统利用压电堆转换器将电能转换为机械能。压电堆需要被提供数千伏量级的高电压。现有的超声波密封系统通常依赖于复杂的解决方案，以使密封设备在被提供这种高电压时在所需的环境条件下运行。这种现有的解决方案需要更多的资源和维护。此外，由于与生产线中某些包装机系统的兼容性问题，实施起来很困难。例如，已经提出了基于线性马达技术的输送机系统来操纵生产线中的包装容器。这些输送机系统通常包括闭环轨道和多个可移动物体或推车，该可移动物体或推车通过分别控制沿着轨道的多个螺线管而沿着轨道独立地移动。因此，超声波密封系统的实施必须容纳这种可独立移动的推车。
发明内容
本发明的目的是至少部分地克服现有技术的一个或多个限制。特别地，一个目的是提供一种改进的超声波密封设备，特别是允许在高压压电功率电路中促进对环境条件的控制，并且特别是当在包括沿着轨道的多个可独立移动的推车的输送机系统中实施时。一个目的是提供一种控制超声波密封设备中的湿度的相关方法。
在本发明的第一方面中，这是通过一种超声波密封设备实现的，该超声波密封设备包括：用于密封包装材料的超声焊极(sonotrode)，其包括压电换能器以生成用于所述密封的超声波声振动；壳体；连接至压电换能器的功率电路，其中，功率电路被封装在壳体中；以及吸收器，其被布置在壳体中以吸收其中的大气中的湿气以降低湿度。
在本发明的第二方面中，这是通过一种控制超声波密封设备中的湿度的方法来实现的，该超声波密封设备具有压电换能器以生成用于密封包装材料的超声波声振动，以及封装在壳体中并连接至压电换能器的功率电路，该方法包括利用布置在壳体中的吸收器来吸收壳体中的大气中的湿气。
在本发明的第三方面中，这是通过在超声波密封设备的壳体中使用吸收器来实现的，该壳体封装功率电路，该功率电路连接至压电换能器以生成超声波振动以便利用所述超声波密封设备来密封包装材料。
在本发明的第四方面中，这是通过包括根据第一方面的设备的包装机，和/或执行根据第二方面的方法的包装机来实现的。
在从属权利要求中定义了本发明的其他示例，其中针对第一方面的特征可以针对后续方面实现，反之亦然。
将吸收器布置在封装压电功率电路的壳体中允许吸收壳体内部的大气中的湿气，这防止了高压电路的短路和部件故障。
本发明的其他目的、特征、方面和优点将从以下详细描述以及附图中显现。
附图说明
现在将通过示例的方式参考所附的示意图来描述本发明的实施方案。
图1是超声波密封设备的示意图；
图2是用于超声波密封设备的功率电路的壳体的示意图；
图3是具有多个可移动的超声波密封设备的输送机系统的示意图；
图4a是控制超声波密封设备中的湿度的方法的流程图；以及
图4b是控制超声波密封设备中的湿度的方法的流程图。
具体实施方式
现在将在下文中参考附图更全面地描述本发明的实施方案，其中示出了本发明的一些但不是全部实施方案。本发明可以以许多不同的形式来实施，并且不应被解释为限于在此阐述的实施方案。
图1是超声波密封设备100的示意图，该超声波密封设备100包括用于密封包装材料(未示出)的超声焊极101。超声波密封设备100包括压电换能器102以生成超声波声振动以密封用于制造包装容器的包装材料。超声波密封设备100包括壳体103和连接至压电换能器102的功率电路104。功率电路104被封装在壳体103中，并且是用于为压电换能器102供电的高压电路。超声波密封设备100包括吸收器105，该吸收器105布置在壳体103中以吸收壳体103内部的大气中的湿气。由此降低壳体103内的湿度。通过在功率电路104的壳体103内部使用吸收器105，湿度可以被控制并保持在高压压电功率电路104的临界水平以下。由此防止冷凝，否则可能导致电路104的短路和部件故障。因此可以省去用来控制湿度的现有复杂系统(例如使用压缩空气系统)。因此，在满足功率电路104的必要环境要求的同时，可以降低超声波密封设备100的复杂性和成本。此外，降低复杂性使得有助于在基于线性马达技术的输送机系统中实施超声波密封设备100，其中，超声波密封设备100可沿轨道独立移动，如下面关于图3进一步描述的。例如，在这种输送机系统中安装使用压缩空气的系统会增加其复杂性和成本，并潜在地影响输送机系统的性能，从而会降低操作速度。因此，将吸收器105布置在封装压电功率电路104的壳体103中使得利用可独立移动的密封设备100来保持这种输送机系统的高性能，并提供了生产线的高产量。
超声波密封设备100可以包括容器106以将吸收器105保持在壳体103中的限定位置中。这提供了对吸收器105的位置的便利型优化以及对壳体103中的湿度的改善型控制。例如，壳体105内部空间的某些部分可能更易于凝结。此外，将吸收器105保持在限定位置提供了更稳固的超声波密封设备100，其中减小了吸收器105干扰相邻部件的风险，因为超声波密封设备100可以在不同的密封操作中经历快速运动。图2是示出了将吸收器105保持在壳体103中的限定位置中的容器106的示例的示意图。应当理解，图2是示例，并且容器106可以根据密封设备100的配置而将吸收器105保持在各种优化位置中。
在一个示例中，容器106可以将吸收器105保持在邻近功率电路104的限定位置中，如图2中示意性所示。这使得进一步降低了使靠近功率电路104的高压部件的液体冷凝的风险。因此，较小的部件损坏以及密封应用和整个生产线中断的风险，提供了对超声波密封设备100的更安全的操作。
容器106可包括固定元件107以将容器106可移除地附接到壳体103。使容器106可移除地附接到壳体103使得在需要时便于吸收器105的安装和更换。因此，由于可以最大程度地减少这种更换所花费的时间，从而便于在对生产线的影响最小的情况下进行维护。
容器106可以是圆柱形的，并且固定元件107可以包括可拧入壳体103的开口108中的螺纹。这使得便于将容器106固定到壳体103上，并且进一步便于容器106的后续拆卸以更换吸收器105。应当理解，容器106和/或壳体103可以包括各种其他固定元件107，例如扣环、钩夹、锁、凸缘、丝线等，以将容器106可移除地附接到壳体103。尽管包括可拧入壳体103的开口108中的螺纹的圆柱形容器106可提供特别方便和稳固的附接，但是可想到的是，容器106可具有各种形状，例如矩形、椭圆形或圆形，与上述固定元件107中的任何一个进行组合。
容器106可以包括包围吸收器105的壁109。壁109可以包括多个穿孔110，如图2中示意性示出的。因此，尽管容器106允许吸收器105在壳体103中的牢固定位，穿孔110使得改善了壳体103内部的空气在吸收器105周围的循环，这允许增加吸收器105对空气中的湿气的吸收并更有效地降低壳体103中的湿度。容器106的壁109中的穿孔110的形状和数量可以变化，以优化吸收器105与壳体103中的大气之间的接触。
吸收器105可以包括干燥剂。干燥剂是在其附近诱发或维持干燥状态(desciccation,干燥)的吸湿性物质。即，干燥剂与保湿剂相反。干燥剂可以是吸收水的固体材料。干燥剂可以是固体以外的其他形式，并且可以通过其他原理(例如水分子的化学键合)吸收水。具有包括干燥剂的吸收器105提供了对壳体103内部的大气中的湿度的有效和资源高效的控制。
干燥剂可包含二氧化硅。具有包含二氧化硅的干燥剂允许容易地处理吸收器105，以及相对于所需资源而言的高效率。干燥剂的效率可以用干燥剂中可储存的水相对于干燥剂的质量之比来测量。在其他示例中，干燥剂可包括活性炭，和/或硫酸钙，和/或氯化钙，和/或分子筛，例如沸石，和/或吸湿聚合物。
超声波密封设备100可以包括传感器111以检测壳体103内部的大气中的湿气。传感器111可以与控制设备301连通，如图2示意性所示。传感器111可以经由无线通信协议与控制设备301通信。控制设备301被配置为从传感器111接收传感器数据。传感器数据可以指示湿气的量，即，壳体103内部的大气中的水量。传感器111因此可以检测大气中的湿度水平。控制设备301可以被配置为向用户通知大气中的湿气的阈值水平。因此可以确定湿气量的量度，例如绝对或相对湿度水平，并与预定义的阈值水平进行比较。当超过预定义的阈值水平时，用户会收到警报通知。这提供了对超声波密封设备100的便利的湿度控制，因为这样的通知可以触发吸收器105的更换。
如图1的示例中示意性示出的，超声波密封设备100可以包括框架112。超声焊极101和壳体103可以附接到框架112，如图1进一步所示。超声波密封设备100可以如图3中示意性示出的，包括配置为与输送机系统300的轨道302接合的轨道引导件113，使得框架112和超声波密封设备100可沿着轨道302移动。轨道引导件113可包括辊子，其布置在框架的相对侧以与轨道302接合。输送机系统300可以包括控制单元303，该控制单元303被配置为控制多个超声波密封设备100、100'沿着轨道302的各个位置。如上所述的具有吸收器105的超声波密封设备100在这样的输送机系统300中提供了便利的实施方式，同时具有对超声波密封设备100内部的湿度水平的有效控制。
壳体103可以形成为框架112中的一体式外壳。这提供了稳固的超声波密封设备100，同时吸收器105允许有效地控制一体式外壳内部空间中的湿度水平。
图4a是控制超声波密封设备100中的湿度的方法200的流程图。如上所述，超声波密封设备100包括压电换能器102以生成用于密封包装材料的超声波声振动，以及封装在壳体103中的功率电路104。功率电路104连接至压电换能器102。方法200包括利用布置在壳体103中的吸收器105来吸收201在壳体103中的大气中的湿气。方法200因此提供了有利的益处。如以上关于超声波密封设备100和图1至3所述的那样。方法200使得降低了高压压电功率电路104的部件故障的风险，同时便于利用输送机系统300在包装机中实施超声波密封设备100，如关于图3所述的那样。
图4b是控制超声波密封设备100中的湿度的方法200的另一流程图。方法200可以包括检测202壳体103内部的大气中的湿气的阈值水平，并且向用户通知203所述阈值水平。因此，可以将湿气量的量度测量为例如绝对或相对湿度水平。当达到定义的阈值水平时，用户会收到警报通知。这提供了对超声波密封设备100的便利的湿度控制，因为这样的通知可以触发吸收器105的更换。
提供了一种计算机程序产品，其包括指令，当程序由计算机执行时，该指令使计算机执行如上所述的方法200的检测202和通知203的步骤。
提供了吸收器105在超声波密封设备100的壳体103中的用途，其具有如上关于图1至4的所述的有利益处。如上所述，壳体103封装功率电路104，该功率电路104连接到压电换能器102以生成超声波振动以用超声波密封设备100密封包装材料。
提供了一种包装机(未示出)，其包括如上关于图1至2所述的超声波密封设备100。替代地或附加地，包装机执行如上所述的方法200。因此，包装机提供如上关于超声波密封设备100和方法200所述的有利益处。
根据以上描述，尽管已经描述和示出了本发明的各种实施方案，但是本发明不限于此，而是还可以在所附权利要求书所限定的主题的范围内以其他方式实施。

Claims (15)

1.一种超声波密封设备(100)，其包括：
用于密封包装材料的超声焊极(101)，所述超声焊极(101)包括：
压电换能器(102)以生成超声波振动以进行所述密封，
壳体(103)，
连接到所述压电换能器(102)的功率电路(104)，其中所述功率电路(104)封装在所述壳体(103)中，以及
吸收器(105)，所述吸收器(105)布置在所述壳体(103)中以吸收其中的大气中的湿气以降低湿度。
2.根据权利要求1所述的超声波密封设备，包括容器(106)以将所述吸收器(105)保持在所述壳体(103)中的限定位置。
3.根据权利要求2所述的超声波密封设备，其中，所述限定位置邻近所述功率电路(104)。
4.根据权利要求2或3所述的超声波密封设备，其中，所述容器(106)包括固定元件(107)以将所述容器(106)可移除地附接到所述壳体(103)。
5.根据权利要求4所述的超声波密封设备，其中，所述容器(106)是圆柱形的，并且所述固定元件(107)包括能拧入所述壳体(103)的开口(108)中的螺纹。
6.根据权利要求2至5中任一项所述的超声波密封设备，其中，所述容器(106)包括包围所述吸收器(105)的壁(109)，并且其中，所述壁(109)包括多个穿孔(110)。
7.根据权利要求1至6中任一项所述的超声波密封设备，其中，所述吸收器(105)包括干燥剂。
8.根据权利要求7所述的超声波密封设备，其中，所述干燥剂包括易于处理的廉价的二氧化硅，和/或活性炭，和/或硫酸钙，和/或氯化钙，和/或分子筛，例如沸石，和/或吸湿聚合物。
9.根据权利要求1至8中任一项所述的超声波密封设备，包括：
传感器(111)以检测所述大气中的湿气，其中，所述传感器(111)与控制设备(301)通信，所述控制设备(301)被配置为向用户通知所述大气中的湿气的阈值水平。
10.根据权利要求1至9中的任一项所述的超声波密封设备，包括：
框架(112)，其中，所述超声焊极(101)和所述壳体(103)附接到所述框架(112)，以及
轨道引导件(113)，其被配置为与轨道(302)接合，使得所述框架(112)能沿着所述轨道(302)移动。
11.根据权利要求10所述的超声波密封设备，其中，所述壳体(103)形成为在所述框架(112)中的一体式外壳。
12.一种控制超声波密封设备(100)中的湿度的方法(200)，所述超声波密封设备(100)具有压电换能器(102)以生成超声波振动以密封包装材料，以及封装在所述壳体(103)中并且连接到所述压电换能器(102)的功率电路(104)，所述方法包括：
利用布置在所述壳体(103)中的吸收器(105)吸收所述壳体(103)中的大气中的湿气(201)。
13.根据权利要求12所述的方法，包括：
检测(202)所述大气中的湿气的阈值水平，以及
通知(203)用户所述阈值水平。
14.吸收器(105)在超声波密封设备(100)的壳体(103)中的用途，所述壳体封装功率电路(104)，所述功率电路(104)连接到压电换能器(102)以生成超声波声振动以用所述超声波密封设备密封包装材料。
15.一种包装机，其包括根据权利要求1至11中任一项所述的超声波密封设备(100)和/或执行根据权利要求12至13中任一项所述的方法(200)。
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