CN210100735U

CN210100735U - Ultrasonic welding device

Info

Publication number: CN210100735U
Application number: CN201920795072.8U
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 carrying out intermittent welding on a plurality of pre-welding areas arranged at equal intervals on various sheet strips, and is provided with an ultrasonic welding head and an anvil roller matched with the ultrasonic welding head, N pattern parts are correspondingly arranged on the anvil roller, the sheet strips are conveyed to the gap between the ultrasonic welding head and the pattern parts of the anvil roller to be welded with each other, and the ultrasonic welding device also comprises a servo driving mechanism which is used for driving the anvil roller to rotate at a constant speed or at a periodic variable speed; when the pattern on the anvil roll passes through the end face of the ultrasonic welding head, the linear speed of the surface of the anvil roll is equal to the linear speed of the sheet material strip under the action of the servo driving mechanism. The utility model discloses a servo actuating mechanism changes the rotation rate of hammering block roller, and then realizes the production speed that can match different size products according to the hammering block roller of certain diameter design, adapts to the welding production of many size products, has greatly reduced workman's intensity of labour, has reduced the manufacturing cost of device.

Description

Ultrasonic welding device

Technical Field

The utility model relates to a disposable hygienic articles equips the manufacture field, especially relates to an ultrasonic welding device who adapts to many yards of products.

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, the problem of product code change is often involved in the production process, and the common practice is as follows: the diameter of a welding mechanism of the welding device is changed to increase or decrease the arc length of the circumference, so that the purpose of changing the size is achieved, therefore, the whole welding mechanism needs to be changed, namely, the welding device is provided with various types of welding mechanisms corresponding to products with different sizes, and the defects that the traditional mode has high manufacturing cost, long consumed time, influence on-site production efficiency and the like are seen.

SUMMERY OF THE UTILITY MODEL

In order to overcome the problems, the utility model provides an ultrasonic welding device, solve traditional device and trade a yard inconvenient, manufacturing cost is high, trade a yard problem that wastes time and energy.

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 plurality of sheet strips, and comprises an ultrasonic welding head and an anvil roller matched with the ultrasonic welding head, wherein N patterns are correspondingly arranged on the anvil roller, and the sheet strips are conveyed to a gap between the ultrasonic welding head and the patterns of the anvil roller to be welded with each other; the anvil roller is driven to rotate at a constant speed or at a periodically variable speed by a servo driving mechanism; when the pattern on the anvil roll passes through the end face of the ultrasonic welding head, the linear speed of the surface of the anvil roll is equal to the linear speed of the sheet material strip under the action of the servo driving mechanism. By adopting the technical scheme, when the product is changed, the ultrasonic welding of a plurality of product sizes can be realized by adopting one anvil roller through the periodical speed change design of the servo driving mechanism, so that the manufacturing cost and the labor intensity of workers are greatly reduced. N may be any integer of 1, 2, or 3 … ….

Furthermore, the servo driving mechanism comprises a servo motor, a speed reducer and a coupler, and the servo motor is connected with the anvil roller through the speed reducer and the coupler, so that the anvil roller performs constant-speed or periodic variable-speed rotary motion.

Further, when the anvil roll rotates at a periodic variable speed, the anvil roll performs N variable speed cycles each time the anvil roll rotates one circle, each variable speed cycle includes a constant speed interval and a variable speed interval, and the angle of the constant speed interval is 20 to 50 degrees. Furthermore, an angular bisector of the uniform speed interval is coincident with or parallel to a centerline of the end face of the ultrasonic welding head.

Further, the anvil roll rotates one round with a circumference of S0 and the interval between adjacent pre-welding areas is S1; when S0/N is equal to S1, the anvil roller rotates at a constant speed, and when S0/N is not equal to S1, the anvil roller rotates at a periodically variable speed. Specifically, when S0/N > S1, the anvil roll performs N speed change cycles per rotation of the anvil roll, 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.

Further, the anvil roll rotates a number of speed variation cycles equal to the number of pattern portions on the anvil roll. The product formed by welding is a disposable sanitary product, such as baby pull-ups, adult pull-ups, female menstrual pants, and the like.

The utility model has the advantages that: the utility model discloses a servo actuating mechanism changes the rotation rate of hammering block roller, and then realizes the production speed that can match different size products according to the hammering block roller of certain diameter design, adapts to the welding production of many size products, has greatly reduced workman's intensity of labour, has reduced the manufacturing cost of device.

Drawings

Fig. 1 is a schematic view of the present invention.

Fig. 2 is a schematic diagram of the present invention.

Fig. 3 is a schematic structural diagram of the present invention.

Fig. 4 is an enlarged view of a portion of the present invention illustrating the offset of the ultrasonic horn relative to the anvil roll.

Fig. 5 is a graph of angular displacement versus time for the anvil roll of example 1.

Fig. 6 is a graph of angular velocity versus time for the anvil roll of example 1.

Fig. 7 is a graph of angular displacement versus time for an anvil roll according to example 2.

Fig. 8 is a graph of angular velocity versus time for an anvil roll of example 2.

Detailed Description

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

As shown in fig. 1 to 2, an ultrasonic welding apparatus for intermittently welding a plurality of pre-welding areas 102 arranged at equal intervals on a plurality of sheet materials 101 includes an ultrasonic horn 1 and an anvil roll 2 fitted thereto, wherein N patterns 3 are correspondingly provided on the anvil roll 2, and the sheet materials 101 are conveyed to a gap between the ultrasonic horn 1 and the patterns 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.

In order to prevent the product from shaking and the adverse effect of wrinkle on ultrasonic welding, belt pressing mechanisms are respectively arranged before and after the welding station of the sheet material strip 101, and the sheet material strip passes through the belt pressing mechanism at the inlet side, then passes through the ultrasonic welding station and then is output through the belt pressing mechanism at the outlet side in the advancing process.

The ultrasonic welding device is further described below with reference to fig. 3.

As shown in fig. 3, an ultrasonic welding apparatus for intermittently welding a plurality of pre-welding areas 102 arranged at equal intervals on a plurality of sheet strips 101 includes an ultrasonic horn 1 and an anvil roll 2 fitted thereto, N patterns 3 are correspondingly provided on the anvil roll 2, and the sheet strips 101 are conveyed to a gap between the ultrasonic horn 1 and the patterns 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. Belt pressure feeding mechanisms for ensuring the flatness and the tension of the sheet strip are respectively arranged in front of and behind the welding station of the sheet strip 101.

The belt pressure feed mechanism includes: an upper pressing belt 8 and a lower pressing belt 9; the upper pressing belt 8 can move up and down in a vertical plane relative to the 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 speeds of the upper pressing belt and the lower pressing belt are the same. During operation, the upper pressing belt 8 applies a certain pressure to the lower pressing belt 9, and the pressure is adjustable. The upper and lower pressing belts 8 and 9 are preferably sponge belts.

In the case of the example 1, the following examples are given,

when the number of pattern portions N on the surface of the anvil roll is 2, the circumferential length S0 of one rotation of the anvil roll is 800mm, the pitch S1 of the pre-welded region on the surface of the sheet material strip is 300mm, and g1 is 40 °, the angular displacement-time curve and the angular velocity-time curve required for the speed change of the anvil roll at a production speed of 600 sheets per minute are shown in fig. 5 to 6.

In the case of the example 2, the following examples are given,

the angular displacement-time curve and angular velocity-time curve required for the anvil roll shift are shown in fig. 7 to 8, taking the interval S1 between the welding areas on the surface of the sheet strip as 500mm, and the rest of the parameters are the same as in example 1.

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 plurality of sheet strips, and comprises an ultrasonic welding head and an anvil roller matched with the ultrasonic welding head, wherein N patterns are correspondingly arranged on the anvil roller, and the sheet strips are conveyed to a gap between the ultrasonic welding head and the patterns of the anvil roller to be welded with each other, and the ultrasonic welding device is characterized in that:

the anvil roller is driven to rotate at a constant speed or at a periodically variable speed by a servo driving mechanism; when the pattern on the anvil roll passes through the end face of the ultrasonic welding head, the linear speed of the surface of the anvil roll is equal to the linear speed of the sheet material strip under the action of the servo driving mechanism.

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

the servo driving mechanism comprises a servo motor, a speed reducer and a coupler, and the servo motor is connected with the anvil roll through the speed reducer and the coupler.

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

when the anvil roll rotates at a periodic variable speed, the anvil roll performs N variable speed cycles every time the anvil roll rotates for one circle, each variable speed cycle comprises a constant speed interval and a variable speed interval, and the angle of the constant speed interval is 20-50 degrees.

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

and the angular bisector of the uniform speed interval is coincident with or parallel to the center line of the end face of the ultrasonic welding head.

5. The ultrasonic welding apparatus of claim 3 or 4, wherein:

the circumference of one rotation of the anvil roll is S0, and the distance between the adjacent pre-welding areas is S1; when S0/N is equal to S1, the anvil roller rotates at a constant speed, and when S0/N is not equal to S1, the anvil roller rotates at a periodically variable speed.

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

the anvil roll rotates through a rotation of the speed variation period equal in number to the number of pattern portions.