CN212312790U

CN212312790U - Ultrasonic welding device

Info

Publication number: CN212312790U
Application number: CN201922447632.3U
Authority: CN
Inventors: 方安江; 龚志龙; 李大柱
Original assignee: Huangshan Futian Precision Manufacturing Co Ltd
Current assignee: Huangshan Futian Precision Manufacturing Co Ltd
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2021-01-08
Anticipated expiration: 2029-12-30

Abstract

The utility model discloses an ultrasonic welding device, including ultrasonic vibration subassembly, checkered roller, fine-tuning and actuating mechanism, fine-tuning links to each other with the ultrasonic vibration subassembly, and can make the micro-adjustment to the clearance between bonding tool and the checkered roller, and ultrasonic vibration subassembly and fine-tuning constitute jointly and remove the subassembly, and actuating mechanism links to each other with removing the subassembly for the stroke between bonding tool and the checkered roller on the control removal subassembly. The utility model discloses a scheme of drive division combination piezoelectric actuator realizes the big displacement of bonding tool for the checkered roller, the micrometric displacement adjustment, and wherein piezoelectric actuator has the position adjustment precision of submicron level, the response time of millimeter level, can make the adjustment of welding force have high accuracy and high responsiveness, and the drive division is through predetermineeing welding force safety threshold to can realize the big displacement motion of bonding tool, thereby realize ultrasonic continuous welding production.

Description

Ultrasonic welding device

Technical Field

The present invention relates to the field of disposable hygienic articles, and more particularly to a device for ultrasonic processing of sheets, which are one of single-layer and multi-layer finished products or semi-finished products of hygienic articles or similar consumables.

Background

Conventionally, as a disposable sanitary product, for example, a disposable sanitary product having a front abdominal portion, a back portion, and a crotch portion, and in which the front abdominal portion and the back portion are ultrasonically welded by a pair of side seal portions (or weld portions) is known. In forming the side seal, a method is employed in which a thermoplastic sheet material constituting the front abdominal section and the back section is continuously supplied to an anvil roller rotatable about a predetermined axis and is disposed between ultrasonic horns opposed to the outer peripheral surface of the anvil roller in cooperation with the anvil. The thermoplastic sheets are supplied between the anvil and the ultrasonic horn in a state of facing each other, and the thermoplastic sheets continuously supplied between the anvil and the ultrasonic horn are subjected to ultrasonic welding intermittently at a period in which the anvil approaches the ultrasonic horn. Thereby forming a welded portion where the thermoplastic sheets facing each other are welded to each other.

Therefore, the ultrasonic horn and the anvil roll are required to be movable relative to each other, and furthermore the gap between the ultrasonic horn and the anvil roll must be such that the sheet can be introduced into the gap, and the ultrasonic horn is pressed against the sheet with a predetermined welding force in order to achieve an optimum welding effect. For example, DE19753740 discloses a device with a pressure sensor for measuring the force applied by the sheet material to the ultrasonic horn, which although proposes the idea of adjusting the gap by measuring the force by means of the pressure sensor, has the problems of complicated installation of the pressure sensor, severe delay in the measurement of the force, inability to adjust the gap in real time in accordance with the operating conditions, etc.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing an ultrasonic welding device solves current device welding force adjustment precision not high, the response is insensitive, can't adapt to the problem of serialization welding production.

The utility model provides a technical scheme that above-mentioned technical problem adopted does: an ultrasonic welding device comprises an ultrasonic vibration assembly and a pattern roller which are arranged at intervals, and is used for conveying a sheet object to be welded between a welding head of the ultrasonic vibration assembly and the pattern roller so as to weld the sheet object to be welded.

Further comprising: the device comprises a fine adjustment mechanism and a driving mechanism, wherein the fine adjustment mechanism is connected with an ultrasonic vibration assembly and can make fine adjustment on a gap between a welding head and a pattern roller, the ultrasonic vibration assembly and the fine adjustment mechanism jointly form a moving assembly, the driving mechanism is connected with the moving assembly and is used for controlling a stroke between the welding head on the moving assembly and the pattern roller, and the stroke path and the fine adjustment mechanism are in the same direction or opposite directions.

Furthermore, the driving mechanism has a base plate, a first slider connected to the moving assembly and linearly movable along the base plate, and a driving portion that may act on the first slider or may directly act on a member connected to the first slider. Preferably, the driving part is a cylinder or a motor.

Furthermore, the fine adjustment mechanism comprises a supporting plate connected with the first sliding block, a second sliding block connected with the ultrasonic vibration component and capable of moving linearly along the supporting plate, a piezoelectric driver arranged on one side of the supporting plate, and a pressure sensor matched with the piezoelectric driver; and a spring is arranged on the other side of the supporting plate.

When the welding operation is executed, the spring can press the ultrasonic vibration component on the end face of the piezoelectric driver through the pressure sensor, the driving part pushes the moving component to reach a preset position, and then the ultrasonic vibration component is close to the pattern roller in a micro-displacement mode under the action of the piezoelectric driver; in the process that the welding head is close to the checkered roller, the piezoelectric sensor detects the reaction welding force of the checkered roller to the ultrasonic vibration assembly, the reaction welding force is compared with the preset welding force, and the ultrasonic vibration assembly is controlled to be close to or far away from the checkered roller according to the comparison result of the piezoelectric driver. Adopt the scheme of drive division combination piezoelectric actuator, realize the big displacement of bonding tool for the checkered roller, the micrometric displacement adjustment, wherein piezoelectric actuator has submicron level's position adjustment precision, millimeter level's response time, can make the adjustment of welding force have high accuracy and high responsiveness, and the drive division is preferred to use the cylinder, through predetermineeing welding force safety threshold to can realize the big displacement motion of bonding tool, thereby realize ultrasonic continuous welding production.

In order to prevent the welding head from colliding with the pattern roller and protect the welding head, a limit block is further arranged on the base plate on the travel of the moving assembly close to the pattern roller, and when the first sliding block abuts against the limit block, the distance between the end face of the welding head and the surface of the pattern roller is 0.06-0.15 mm.

Further, the stroke range of the piezoelectric driver is 0.08-0.2mm, and the range of the maximum output thrust is 4000- & gt 8000N. In the welding process, the piezoelectric driver generates displacement under the action of voltage, when the welding interference of the material joint is met, the driving voltage of the piezoelectric driver can be set to be 0 volt, and the generated micro displacement is zero.

Furthermore, the driving part is a cylinder, the stroke of the cylinder is 10-30mm, and the output pressure of the cylinder in the welding process is 100-1500N.

The utility model has the advantages that:

1. the piezoelectric driver is adopted to directly drive the ultrasonic vibration component, no intermediate transmission link is adopted, and higher micro-displacement response characteristics can be obtained; meanwhile, the submicron displacement control precision of the piezoelectric actuator can enable the control of the welding force to be more accurate.

2. The large displacement and the small displacement adopt a separate control mode, so that the operation and the adjustment in the welding preparation process are facilitated.

3. The driving part preferably uses an air cylinder, and the maximum welding force is controlled by limiting the pressure of the air cylinder, so that the ultrasonic vibration protection device has the function of protecting an ultrasonic vibration system.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Detailed Description

The present invention will be described below with reference to the drawings of embodiments of the present invention.

In the embodiment of the method, the first step,

as shown in fig. 1, an ultrasonic welding apparatus for conveying a sheet to be welded between a horn and a pattern roller of an ultrasonic vibration unit to weld each other, comprising: ultrasonic vibration assembly 101, pattern roller 102, fine adjustment mechanism 103 and driving mechanism 104.

Wherein, the fine adjustment mechanism 103 is connected with the ultrasonic vibration assembly 101 and can make fine adjustment to the gap between the welding head 1 and the checkered roller 102, and the ultrasonic vibration assembly 101 and the fine adjustment mechanism 103 together form a moving assembly.

The driving mechanism 104 is connected with the moving assembly and is used for controlling the large displacement stroke between the welding head 1 and the pattern roller 102 on the moving assembly.

A first engaging portion 2 and a second engaging portion 3 are also fixed to the ultrasonic vibration unit 101 on both sides of the second slider 32.

The structures of the driving mechanism 104 and the fine adjustment mechanism 103 will be further described below.

The driving mechanism 104 has a base plate 41, a first slider 42 connected to the moving member and linearly movable along the base plate, an air cylinder 43, and a stopper 44.

The stroke of the cylinder 44 is 10-30mm, and the output pressure of the cylinder in the welding process is 100-1500N. The cylinder 44 acts with its main axis on the support plate 31 connected to the first slide.

The limiting block 44 is arranged on the substrate 41 and is positioned on the stroke of the moving assembly close to the pattern roller, and when the first sliding block abuts against the limiting block, the distance between the end surface of the welding head and the surface of the pattern roller is 0.06-0.15 mm.

The fine adjustment mechanism 103 has: a support plate 31 connected to the first slider, a second slider 32 connected to the ultrasonic vibration unit and linearly movable along the support plate, a piezoelectric actuator 33 provided at one side of the support plate, and a pressure sensor 34 engaged with the piezoelectric actuator. A spring 35 is also provided on the other side of the support plate. The stroke range of the piezoelectric driver 33 is 0.08-0.2mm, and the range of the maximum output thrust is 4000-.

A first mounting block 36 and a second mounting block 37 are fixed to both sides of the support plate 31, respectively, wherein the spring 35 is disposed between the first mounting block 36 and the first fitting portion 2, the pressure sensor 34 is mounted on the second fitting portion 3, and the piezoelectric actuator 33 is mounted on the second mounting block 37. When performing the welding operation, the spring 35 may press the ultrasonic vibration component against the end face of the piezoelectric driver 33 via the pressure sensor 34.

When the device works, the air cylinder pushes the moving assembly to reach a preset position and abut against the limiting block, and the distance between the end face of the welding head and the surface of the patterned roller is 0.06-0.15 mm; then the welding head of the ultrasonic vibration assembly is close to the pattern roller in a micro-displacement mode under the action of a piezoelectric driver. In the process that the welding head is close to the checkered roller, the piezoelectric sensor detects the reaction welding force of the checkered roller to the ultrasonic vibration assembly, the reaction welding force is compared with the preset welding force, and according to the comparison result, the piezoelectric driver controls the welding head of the ultrasonic vibration assembly to be close to or far away from the checkered roller. The piezoelectric driver has submicron-level position adjustment precision and millimeter-level response time, can enable the adjustment of the welding force to have high precision and high responsiveness, and the cylinder can realize large displacement movement of the welding head through presetting a welding force safety threshold. By adopting the scheme of combining the air cylinder with the piezoelectric driver, the large displacement and the micro displacement adjustment of the welding head relative to the pattern roller can be realized, so that the aim of ultrasonic continuous welding production is fulfilled.

The above description and the drawings only show the preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can appreciate that the technical solutions and the inventive concepts of the present invention can be equally replaced or changed within the technical scope of the present invention.

Claims

1. The utility model provides an ultrasonic welding device for will wait that welding sheet material carries to weld between bonding tool and the decorative pattern roller of ultrasonic vibration subassembly with each other of welding, it includes ultrasonic vibration subassembly and decorative pattern roller, its characterized in that: still include fine-tuning and actuating mechanism, fine-tuning links to each other with the ultrasonic vibration subassembly, and can make the micro-adjustment to the clearance between bonding tool and the decorative pattern roller, the ultrasonic vibration subassembly constitutes the removal subassembly with fine-tuning jointly, actuating mechanism links to each other with the removal subassembly for the stroke between bonding tool and the decorative pattern roller on the control removal subassembly, this stroke route is right with fine-tuning the route syntropy or the reverse of clearance micro-adjustment.

2. An ultrasonic welding apparatus as defined in claim 1, wherein: the driving mechanism is provided with a substrate, a first sliding block which is connected with the moving assembly and can move linearly along the substrate, and a driving part.

3. An ultrasonic welding apparatus as defined in claim 2, wherein: the fine adjustment mechanism comprises a supporting plate connected with the first sliding block, a second sliding block connected with the ultrasonic vibration component and capable of moving linearly along the supporting plate, a piezoelectric driver arranged on one side of the supporting plate, and a pressure sensor matched with the piezoelectric driver; and a spring is arranged on the other side of the supporting plate and can press the ultrasonic vibration component against the end face of the piezoelectric driver through the pressure sensor.

4. An ultrasonic welding apparatus as defined in claim 2, wherein: and a limiting block is further arranged on the substrate on the stroke of the moving assembly close to the patterned roller, and when the first sliding block abuts against the limiting block, the distance from the end face of the welding head to the surface of the patterned roller is 0.06-0.15 mm.

5. An ultrasonic welding apparatus as defined in claim 2, wherein: the driving part is a cylinder or a motor.

6. An ultrasonic welding apparatus as defined in claim 3, wherein: the stroke range of the piezoelectric driver is 0.08-0.2mm, and the range of the maximum output thrust is 4000-.

7. An ultrasonic welding apparatus as defined in claim 5, wherein: the driving part is an air cylinder, the stroke of the air cylinder is 10-30mm, and the output pressure of the air cylinder is 100-1500N in the welding process.