Ultrasonic welding device for straight-strip-shaped products

Abstract

The utility model relates to the technical field of welding devices, in particular to an ultrasonic welding device for straight-strip-shaped products. The bottom roller assembly is used for movably abutting against the bottom face of the straight-strip-shaped product, and the first ultrasonic welding assembly is used for movably abutting against the top face of the straight-strip-shaped product so that the bottom face of the straight-strip-shaped product can abut against the bottom roller assembly for first-time welding. The second ultrasonic welding assembly is used for movably abutting against the top face of the straight-strip-shaped product so that the bottom face of the straight-strip-shaped product can abut against the bottom roller assembly to conduct secondary welding. The first ultrasonic welding assembly is located above the feeding side of the bottom roller assembly and is fixedly arranged relative to the bottom roller assembly. The second ultrasonic welding assembly is located above the discharging side of the bottom roller assembly and is fixedly arranged relative to the bottom roller assembly. On the premise that the same welding strength is guaranteed, welding can be carried out at a higher speed.

Description

Technical Field

[0001] The utility model relates to the technical field of welding devices, and more specifically, it relates to an ultrasonic welding device for straight strip products. Background Art

[0002] Straight strip products such as sanitary napkins and diapers are continuously produced in the form of rolled materials during the production process. In one of the links, ultrasonic welding technology is required to weld and fuse non-woven materials, fiber materials, plastics and other materials, so that different layers of materials are locally or integrally welded into one body.

[0003] The existing ultrasonic welding device is only equipped with one ultrasonic welding machine to weld straight strip products. Its welding strength is about 8N / (25mm*5mm), and the maximum welding production capacity is about 200 pieces / min. If welding is carried out at a faster speed, the welding strength will be reduced, which does not meet the use requirements. Summary of the Utility Model

[0004] Aiming at the deficiencies of the existing technology, the purpose of the utility model is to provide an ultrasonic welding device for straight strip products, which can weld at a faster speed on the premise of ensuring the same welding strength.

[0005] The above technical purpose of the utility model is achieved through the following technical solutions:

[0006] An ultrasonic welding device for straight strip products includes a bottom roller assembly for actively pressing against the bottom surface of the straight strip product, a first ultrasonic welding assembly for actively pressing against the top surface of the straight strip product so that the bottom surface of the straight strip product presses against the bottom roller assembly for the first welding, and a second ultrasonic welding assembly for actively pressing against the top surface of the straight strip product so that the bottom surface of the straight strip product presses against the bottom roller assembly for the second welding; the first ultrasonic welding assembly is located above the feeding side of the bottom roller assembly and is relatively fixedly arranged with the bottom roller assembly; the second ultrasonic welding assembly is located above the discharging side of the bottom roller assembly and is relatively fixedly arranged with the bottom roller assembly.

[0007] Optionally, the first ultrasonic welding assembly and the second ultrasonic welding assembly are arranged on both sides of the bottom roller assembly in a V shape.

[0008] Optionally, the first ultrasonic welding assembly includes a mounting plate, on which an ultrasonic welding machine for actively pressing against the top surface of the straight strip product so that the bottom surface of the straight strip product presses against the bottom roller assembly for the first welding is slidably arranged, and a first driving element for driving the ultrasonic welding machine to reciprocally slide and actively press against the top surface of the straight strip product is arranged on the mounting plate.

[0009] Optionally, the bottom roller assembly includes a base, and a bottom roller for movably pressing against the bottom surface of the straight strip product is rotatably provided on the base.

[0010] Optionally, the cross-section of the middle part of the bottom roller perpendicular to the axis of the bottom roller is any one of a triangle, a rhombus, a polygon, and a circle.

[0011] Optionally, a second driving element for driving the bottom roller to rotate is provided on the base.

[0012] Optionally, an air-cooling part for cooling the welding head of the ultrasonic welding machine is provided on the first ultrasonic welding assembly.

[0013] In summary, the utility model has the following beneficial effects: (1) The straight strip product moves to the lower part of the first ultrasonic welding assembly under the action of the external pressure roller. The first ultrasonic welding assembly presses down to press the straight strip product against the bottom roller assembly for the first welding. Then the straight strip product continues to move to the lower part of the second ultrasonic welding assembly. The second ultrasonic welding assembly presses down to press the straight strip product against the bottom roller assembly for the second welding at the same position, so that the welding strength at the same welding position is higher on the premise of unchanged production capacity, or the production capacity is improved on the premise of ensuring that the welding strength at the same welding position does not decrease. (2) The air-cooling part can cool the welding head of the ultrasonic welding machine and clean the fluff near the welding part, and can help improve the stability and welding speed of the welding process. Description of the Drawings

[0014] Figure 1 is the front view of the utility model;

[0015] Figure 2 is the side view of the utility model;

[0016] Figure 3 is Figure 2 the cross-sectional view at the A-A section in

[0017] Figure 4 is the cross-sectional view of the middle part of the bottom roller of the utility model perpendicular to the axis of the bottom roller.

[0018] In the figure: 1, bottom roller assembly; 11, base; 12, bottom roller; 121, pattern; 2, first ultrasonic welding assembly; 21, mounting plate; 22, ultrasonic welding machine; 221, welding head; 222, horn; 223, transducer; 23, air-cooling part; 3, second ultrasonic welding assembly; 4, pressure roller; 5, straight strip product. Detailed Description of the Invention

[0019] In order to make the objectives, features, and advantages of the present utility model more obvious and understandable, the following provides a detailed description of the specific implementation manners of the present utility model with reference to the accompanying drawings. Several embodiments of the present utility model are given in the accompanying drawings. However, the present utility model can be implemented in many different forms and is not limited to the embodiments described herein.

[0020] In the present utility model, unless otherwise clearly specified and defined, terms such as "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0021] In the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath", and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature. The terms "vertical", "horizontal", "left", "right", "up", "down", and similar expressions are only for the purpose of illustration and do not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present utility model.

[0022] The following provides a detailed description of the present utility model with reference to the accompanying drawings and embodiments.

[0023] The present utility model provides an ultrasonic welding device for straight bar-shaped products, such as Figures 1-3As shown in the figure, it includes a bottom roller assembly 1 for actively pressing against the bottom surface of the straight strip product 5, a first ultrasonic welding assembly 2 for actively pressing against the top surface of the straight strip product 5 and then pressing the bottom surface of the straight strip product 5 against the bottom roller assembly 1 for the first welding, and a second ultrasonic welding assembly 3 for actively pressing against the top surface of the straight strip product 5 and then pressing the bottom surface of the straight strip product 5 against the bottom roller assembly 1 for the second welding; the first ultrasonic welding assembly 2 is located above the feeding side of the bottom roller assembly 1 and is relatively fixedly arranged with the bottom roller assembly 1; the second ultrasonic welding assembly 3 is located above the discharging side of the bottom roller assembly 1 and is relatively fixedly arranged with the bottom roller assembly 1.

[0024] Specifically, the bottom roller assembly 1, the first ultrasonic welding assembly 2, and the second ultrasonic welding assembly 3 are all fixedly installed on a frame (not shown in the attached drawings) by bolts, or fixedly installed on a production line by bolts, or are respectively fixedly installed on the ground by different frames. Looking from the front, the first ultrasonic welding assembly 2 and the second ultrasonic welding assembly 3 are arranged in a V shape on both sides of the bottom roller assembly 1. The first ultrasonic welding assembly 2 is located in the upper right of the bottom roller assembly 1, and the second ultrasonic welding assembly 3 is located in the upper left of the bottom roller assembly 1. The strip product 5 moves from right to left under the action of multiple self-powered pressure rollers 4. During welding, the first ultrasonic welding assembly 2 presses down to press the straight strip product 5 against the bottom roller assembly 1 for the first welding, and then the straight strip product 5 continues to move below the second ultrasonic welding assembly 3. The second ultrasonic welding assembly 3 presses down to press the straight strip product 5 against the bottom roller assembly 1 for the second welding at the same position, so that the same position of the straight strip product 5 is welded twice, making the welding strength of the same welding position higher on the premise of unchanged production capacity, or the moving speed of the straight strip product 5 can be increased on the premise of ensuring that the welding strength of the same welding position does not decrease, thereby improving the production capacity.

[0025] Furthermore, the first ultrasonic welding assembly 2 includes a mounting plate 21. An ultrasonic welding machine 22 for actively pressing against the top surface of the straight strip product 5 and then pressing the bottom surface of the straight strip product 5 against the bottom roller assembly 1 for the first welding is slidably arranged on the mounting plate 21. A first driving element (not shown in the attached drawings) for driving the ultrasonic welding machine 22 to reciprocally slide and actively press against the top surface of the straight strip product 5 is arranged on the mounting plate 21.

[0026] As Figures 1-3As shown, the first ultrasonic welding assembly 2 is mainly composed of a mounting plate 21, an ultrasonic welding machine 22, and a first driving element. The mounting plate 21 is tiltedly mounted on the frame of the production line by bolts, and the ultrasonic welding machine 22 is mounted on the mounting plate 21 in a reciprocating manner through a linear slide (a sliding device composed of a linear guide rail and a plurality of sliders, which is a prior art); the first driving element is a servo motor, any one of a servo electric cylinder or a pneumatic cylinder, preferably a servo motor, whose fixed end is mounted on the mounting plate 21 by bolts, and whose movable end is connected to the ultrasonic welding machine 22 by transmission, and can drive the ultrasonic welding machine 22 to slide back and forth on the mounting plate 21 or at least drive the welding head 221 in the ultrasonic welding machine 22 to move against the top surface of the straight strip product 5 and then make the bottom surface of the straight strip product 5 against the bottom roller assembly 1 under the control of electronic components such as a PLC controller and a solenoid valve. The ultrasonic welding machine 22 is a common ultrasonic welding machine in the prior art, generally including a welding head 221, a horn 222, a transducer 223 and other components. The specific structure and connection relationship of each component can be found in the ultrasonic welding device disclosed in CN217454965U2, which will not be described in detail here.

[0027] As can be seen from the accompanying drawings, the structure of the second ultrasonic welding assembly 3 is completely consistent with the structure of the first ultrasonic welding assembly 2, and will not be described in detail here.

[0028] Furthermore, the bottom roller assembly 1 comprises a base 11 , on which a bottom roller 12 is rotatably provided for movably pressing against the bottom surface of the straight strip product 5 .

[0029] Furthermore, the cross section of the middle of the bottom roller 12 perpendicular to the axis of the bottom roller 12 is any one of a triangle, a rhombus, a polygon, and a circle.

[0030] Furthermore, a second driving element (not shown in the drawings) for driving the bottom roller 12 to rotate is disposed on the base 11 .

[0031] like Figures 1-3 As shown, the base 11 is in a concave shape, the middle part of the bottom roller 12 is a pressing part for pressing against the bottom surface of the straight strip product 5, and the pressing part is provided with a pattern 121 for selectively melting and bonding the welding part to form a welding point. The two ends of the bottom roller 12 are cylindrical and mounted on the base 11 through bearings, and one end of the bottom roller 12 is connected to the driving end of the second driving element. The second driving element is a servo motor, any one of a servo electric cylinder or a pneumatic cylinder, preferably a servo motor. In actual production, the outer line speed of the middle part (i.e., the pressing part) of the bottom roller 12 should be as close as possible to the line speed of the straight strip product 5.

[0032] The cross section of the middle part of the bottom roller 12 perpendicular to the axis of the bottom roller 12 can be set according to actual needs, and can be a triangle (such as Figure 4 As shown in B), diamond (as shown in Figure 4a polygon with five or more sides (as shown at C in the figure), Figure 4 a polygon with five or more sides (as shown at D in the figure), a circle (as Figure 4 shown at D in the figure), or any one of them.

[0033] Furthermore, an air-cooling component 23 for cooling the welding head 221 of the ultrasonic welding machine 22 is provided on the first ultrasonic welding assembly 2.

[0034] As Figures 1-3 shown, the air-cooling component 23 is a component such as a micro fan or a compressed air pipe joint that can accelerate air convection or output compressed gas through a compressed air pipe, which can generate an accelerated air flow around the welding head 221, thereby effectively cooling the welding head 221. The air-cooling component 23 is fixedly installed at the bottom of the first ultrasonic welding assembly 2 by means of bolts, buckles, cable ties, etc. In addition, the accelerated air flow generated by the air-cooling component 23 can also clean the fluff near the welding part, which can help improve the stability and welding speed of the welding process. In order to further clean the fluff near the welding part, a brush cleaning mechanism can also be installed at an appropriate position on the first ultrasonic welding assembly 2.

[0035] The above is only the preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions within the idea of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. An ultrasonic welding device for straight strip products, characterized in that: It includes a bottom roller assembly for movably pressing against the bottom surface of a straight strip product, a first ultrasonic welding assembly for movably pressing against the top surface of the straight strip product so that the bottom surface of the straight strip product presses against the bottom roller assembly for a first welding, and a second ultrasonic welding assembly for movably pressing against the top surface of the straight strip product so that the bottom surface of the straight strip product presses against the bottom roller assembly for a second welding; the first ultrasonic welding assembly is located above the feeding side of the bottom roller assembly and is relatively fixedly arranged with the bottom roller assembly; the second ultrasonic welding assembly is located above the discharging side of the bottom roller assembly and is relatively fixedly arranged with the bottom roller assembly.

2. The ultrasonic welding device for straight strip products according to claim 1, characterized in that: The first ultrasonic welding assembly and the second ultrasonic welding assembly are arranged in a V shape on both sides of the bottom roller assembly.

3. The ultrasonic welding device for straight strip products according to claim 2, characterized in that: The first ultrasonic welding assembly includes a mounting plate, on which is slidably provided an ultrasonic welding machine for movably pressing against the top surface of the straight strip product and thereby causing the bottom surface of the straight strip product to press against the bottom roller assembly for the first welding, and the mounting plate is provided with a first driving element for driving the ultrasonic welding machine to slide back and forth and thereby movably pressing against the top surface of the straight strip product.

4. The ultrasonic welding device for straight strip products according to claim 1, characterized in that: The bottom roller assembly comprises a base, on which a bottom roller for movably pressing against the bottom surface of the straight strip product is rotatably arranged.

5. The ultrasonic welding device for straight strip products according to claim 4, characterized in that: The cross section of the middle part of the bottom roller perpendicular to the axis of the bottom roller is any one of a triangle, a rhombus, a polygon and a circle.

6. The ultrasonic welding device for straight strip products according to claim 4, characterized in that: A second driving element for driving the bottom roller to rotate is arranged on the base.

7. The ultrasonic welding device for straight strip products according to claim 3, characterized in that: The first ultrasonic welding assembly is provided with an air cooling component for cooling the welding head of the ultrasonic welding machine.

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