CN210100737U

CN210100737U - Ultrasonic welding device

Info

Publication number: CN210100737U
Application number: CN201920806888.6U
Authority: CN
Inventors: 龚志龙; 李大柱
Original assignee: Huangshan Futian Precision Manufacturing Co Ltd
Current assignee: Huangshan Futian Precision Manufacturing Co Ltd
Priority date: 2019-05-30
Filing date: 2019-05-30
Publication date: 2020-02-21
Anticipated expiration: 2029-05-30

Abstract

The utility model discloses an ultrasonic welding device, which is used for intermittently welding a plurality of pre-welding areas which are arranged at equal intervals on a sheet material strip, and is provided with a welding station and a clamping station for keeping the sheet material strip; the welding station comprises an ultrasonic welding head and an anvil roller matched with the ultrasonic welding head, and the sheet-shaped object strips are conveyed to a gap between the ultrasonic welding head and the anvil roller to be welded with each other; the clamping stations are respectively arranged at the upstream side and the downstream side of the welding station and are provided with belt pressure feeding mechanisms for ensuring the flatness and the tension of the sheet material strips. The utility model discloses can guarantee that the product has good roughness and tension characteristic when passing through the ultrasonic bonding station to make the slice thing strip more be favorable to implementing ultrasonic bonding, when guaranteeing the welding effect, promote the pleasing to the eye degree of product, prevent the product shake and the harmful effects that the fold problem brought for ultrasonic bonding.

Description

Ultrasonic welding device

Technical Field

The utility model relates to a disposable hygienic articles equips the manufacturing field, especially relates to an ultrasonic welding device who prevents the material shake.

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 roller and the ultrasonic horn in a state of facing each other, and the thermoplastic sheets continuously supplied between the anvil roller and the ultrasonic horn are subjected to ultrasonic welding intermittently at a period in which the anvil roller approaches the ultrasonic horn. Thus, a welded portion is formed in which the thermoplastic sheets facing each other are welded to each other.

However, in the conventional ultrasonic welding apparatus, since there is no material holding mechanism before and after the welding station, the load of ultrasonic energy applied to the anvil roller when the ultrasonic horn is operated is large, and the material to be welded is liable to be shaken, which causes a decrease in the accuracy of the welding position and a decrease in the quality of the welded portion.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides an ultrasonic welding device solves the material that traditional device exists and easily shakes, the welding position precision is low, the quality is low problem.

The utility model provides a technical scheme that above-mentioned technical problem adopted does: an ultrasonic welding device is used for intermittently welding a plurality of pre-welding areas which are arranged at equal intervals on a sheet material strip and is provided with a welding station and a clamping station for holding the sheet material strip. The welding station comprises an ultrasonic welding head and an anvil roller matched with the ultrasonic welding head, and the sheet material strip is conveyed to a gap between the ultrasonic welding head and the anvil roller to be welded with each other. The clamping stations are respectively arranged at the upstream side and the downstream side of the welding station and are provided with belt pressure feeding mechanisms for ensuring the flatness and the tension of the sheet material strips.

Furthermore, the belt pressure feeding mechanism comprises an upper pressure belt and a lower pressure belt, the rotation of the upper pressure belt and the rotation of the lower pressure belt are both driven by power, and the surface linear velocities of the upper pressure belt and the lower pressure belt are the same. For the same group of belt pressing and conveying mechanisms, the upper pressing belt and the lower pressing belt can be respectively connected with the driving motor, and the linear velocities of the surfaces of the upper pressing belt and the lower pressing belt are ensured to be consistent by controlling the rotating speed of the driving motor; the upper pressing belt and the lower pressing belt can be connected with a synchronizing mechanism, and the purpose is achieved through one motor.

In order to prevent more effectively that product shake and fold problem from giving the harmful effects that ultrasonic bonding brought, go up and press the belt down and preferably adopt the sponge belt, so can the tension of absorbent material, when guaranteeing the welding effect, promote the outward appearance nature of product. Furthermore, the upper pressing belt can move up and down in a vertical plane relative to the lower pressing belt, and exerts pressure on the lower pressing belt during operation, and the pressure is adjustable. Through pressing the belt for pressing the belt down in vertical plane up-and-down motion on, and then can look at concrete operating mode and carry out corresponding adjustment to this pressure value.

As a further preference of the present invention, the belt pressure feed mechanism is provided with two sets, which include a first belt pressure feed mechanism located on the upstream side of the welding station and a second belt pressure feed mechanism located on the downstream side of the welding station. The belt surface line speed of the second belt pressing and conveying mechanism is greater than or equal to the belt surface line speed of the first belt pressing and conveying mechanism.

Further, the sheet material strip is any one of a raw material and a semi-finished product of a disposable sanitary product.

The utility model has the advantages that: the utility model discloses can guarantee that the product has good roughness and tension characteristic when passing through the ultrasonic bonding station to make the slice thing strip more be favorable to implementing ultrasonic bonding, when guaranteeing the welding effect, promote the pleasing to the eye degree of product, prevent the product shake and the harmful effects that the fold problem brought for ultrasonic bonding.

Drawings

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

Fig. 2 is the structure schematic diagram of the welding station of the utility model.

FIG. 3 is a schematic diagram of a welding station.

FIG. 4 is an enlarged fragmentary view of the welding station illustrating the offset of the ultrasonic horn relative to the anvil roll.

Detailed Description

As shown in fig. 1 to 3, an ultrasonic welding apparatus for intermittently welding a plurality of pre-welding regions 102 arranged at equal intervals on a sheet material strip 101 has a welding station 103 and a holding station 104 for holding the sheet material strip.

Wherein, the welding station 103 comprises an ultrasonic horn 1 and an anvil roll 2 matched with the ultrasonic horn 1, and the sheet material strip 101 is conveyed to the gap between the ultrasonic horn 1 and the anvil roll 2 to be welded with each other. N patterns 3 are provided on the anvil roll 2, and the sheet material 101 is conveyed to a gap between the ultrasonic horn 1 and the pattern 3 of the anvil roll 2 to be welded to each other.

The anvil roll 2 is also provided with a servo driving mechanism for driving the anvil roll 2 to rotate at a constant speed or at a periodically variable speed, the servo driving mechanism comprises a servo motor 4, a speed reducer 5 and a coupling 6, and the servo motor 4 is connected with the anvil roll 2 through the speed reducer 5 and the coupling 6.

When the pattern part 3 on the anvil roll 2 passes through the end face 7 of the ultrasonic horn 1, the linear speed of the surface of the anvil roll 2 is equal to the linear speed of the traveling sheet material 101 under the action of the servo motor 4.

The circumference of one rotation of the anvil roll 2 is S0, and the interval between adjacent pre-welding areas 102 is S1.

1) When S0/N is equal to S1, the anvil roll 2 rotates at a constant speed.

2) When S0/N is not equal to S1, the anvil roll 2 rotates at a periodic speed change, and at the time, the anvil roll 2 performs N speed change cycles each time the anvil roll 2 rotates one turn, each speed change cycle comprises a constant speed section g1 and a speed change section, the angle of the constant speed section g1 is 20-50 degrees, and the angle of the speed change section is 360 degrees/N-g 1.

Specifically, when S0/N > S1, the anvil roll performs N speed change cycles every time the anvil roll rotates, each speed change cycle comprises a low speed uniform section and a speed change section, the pattern part passes through the end face of the ultrasonic welding head in the low speed uniform section in the speed change cycle, the angle g1 of the low speed uniform section is 20-50 degrees, and the angle of the speed change section is 360 degrees/N-g 1;

when S0/N < S1, the anvil roll performs N variable speed cycles every time the anvil roll rotates, each variable speed cycle comprises a high-speed constant speed section and a variable speed section, the pattern part passes through the end face of the ultrasonic welding head in the high-speed constant speed section in the variable speed cycle, the angle g1 of the high-speed constant speed section is 20-50 degrees, and the angle of the variable speed section is 360 degrees/N-g 1.

An angle bisector L1 of the uniform velocity section g1 coincides with or is parallel to a center line L2 of the ultrasonic horn end face 7, the angle bisector L1 is a perpendicular line drawn from the rotational center O1 of the anvil roll toward the ultrasonic horn end face 7, and the uniform velocity section g1 is symmetrically distributed with the angle bisector L1 as a symmetrical line. When this angle bisector L1 coincides with the center line L2 of the ultrasonic horn end face 7, the centre of rotation O1 of the anvil roll, the centre point O2 of the pattern, and the centre point O3 of the ultrasonic horn end face 7 are in the same line, which although enabling welding, involves the risk of the material being cut off during welding. Therefore, preferably, the angle bisector L1 is parallel to the centerline L2 of the ultrasonic horn end face 7, and more specifically, the ultrasonic horn end face is offset toward the upstream side of the sheet material 101, so that a larger initial compression gap is obtained, as shown in fig. 4.

The clamping station is described in detail below.

The clamping stations 104 are respectively arranged at the upstream side and the downstream side of the welding station 103, and are provided with belt press-feeding mechanisms for ensuring the flatness and the tension of the sheet material strip 101, the belt press-feeding mechanisms comprise an upper pressing belt 8 and a lower pressing belt 9, the rotation of the upper pressing belt 8 and the rotation of the lower pressing belt 9 are both driven by power, and the surface linear velocities of the upper pressing belt 8 and the lower pressing belt 9 are the same. The upper pressing belt 8 can move up and down in a vertical plane relative to the lower pressing belt 9, and during operation, the upper pressing belt 8 applies a pressure to the lower pressing belt 9, and the pressure is adjustable.

The two belt press-feed mechanisms are provided, and include a first belt press-feed mechanism 105 located on the upstream side of the welding station 103 and a second belt press-feed mechanism 106 located on the downstream side of the welding station. Wherein the belt surface line speed of the second belt pressure feeding mechanism 106 is greater than or equal to the belt surface line speed of the first belt pressure feeding mechanism 105.

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. An ultrasonic welding device is used for intermittently welding a plurality of pre-welding areas which are arranged at equal intervals on a sheet material strip, and is characterized in that:

having a welding station and a clamping station for holding the sheet material strip;

the welding station comprises an ultrasonic welding head and an anvil roller matched with the ultrasonic welding head, and the sheet-shaped object strips are conveyed to a gap between the ultrasonic welding head and the anvil roller to be welded with each other;

the clamping stations are respectively arranged at the upstream side and the downstream side of the welding station and are provided with belt pressure feeding mechanisms for ensuring the flatness and the tension of the sheet material strips.

2. An ultrasonic welding apparatus as defined in claim 1, wherein:

the belt pressure feeding mechanism comprises an upper pressure belt and a lower pressure belt, the rotation of the upper pressure belt and the rotation of the lower pressure belt are both driven by power, and the surface linear velocities of the upper pressure belt and the lower pressure belt are the same.

3. An ultrasonic welding apparatus as defined in claim 2, wherein:

the upper pressing belt can move up and down in a vertical plane relative to the lower pressing belt, and exerts pressure on the lower pressing belt in the working process, and the pressure is adjustable.

4. An ultrasonic welding apparatus as defined in claim 2, wherein:

the belt pressure feeding mechanisms are provided with two groups, and each belt pressure feeding mechanism comprises a first belt pressure feeding mechanism located on the upstream side of the welding station and a second belt pressure feeding mechanism located on the downstream side of the welding station.

5. An ultrasonic welding apparatus as defined in claim 4, wherein:

the belt surface line speed of the second belt pressing and conveying mechanism is greater than or equal to the belt surface line speed of the first belt pressing and conveying mechanism.

6. The ultrasonic welding apparatus as set forth in any one of claims 2 to 5, wherein:

the upper pressing belt and the lower pressing belt are sponge belts.

7. An ultrasonic welding apparatus as defined in claim 1, wherein:

the sheet material strip is any one of raw materials and semi-finished products of disposable sanitary products.