Non-woven fabric spot welding machine

Abstract

The utility model discloses a non-woven fabric spot welding machine which comprises a machine frame, a welding assembly (an ultrasonic generator, a transducer, an amplitude-change pole and a welding head) and a positioning welding platform (a base, a circular ring die and an arc-shaped material pressing positioning plate). According to the welding assembly, a lifting motor drives a screw to be in threaded transmission with a threaded sleeve of a sliding seat, a lifting air cylinder is combined to control a welding head to move vertically, a pressing positioning plate driven by an oscillating air cylinder is matched to press non-woven fabric, precise ultrasonic welding is achieved, and a ()-shaped welding seam is formed. The equipment supports height adjustment and rotary welding, solves the problem of manual alignment dislocation, and is suitable for efficient production of non-woven fabric products such as masks and the like.

Description

Technical Field

[0001] This utility model relates to the field of nonwoven fabric processing equipment technology, and in particular to a spot welding machine for precise positioning and ultrasonic welding of nonwoven fabrics. Background Technology

[0002] Nonwoven fabric is a type of fabric formed without spinning or weaving, and it is mainly used in various fields such as medical, hygiene, agriculture, industry, and home furnishing. Specific uses include: Medical and hygiene: Nonwoven fabrics are commonly used to make masks, surgical gowns, protective clothing, sterilization wraps, sanitary napkins, diapers, etc.

[0003] Current nonwoven fabric spot welding (such as mask welding) mostly relies on manual alignment of the upper and lower layers of fabric, which is inefficient and prone to misalignment of weld points due to human error, affecting the appearance and function of the finished product. Traditional equipment lacks automated clamping and rotation adjustment structures, making it difficult to meet the requirements of efficient and precise welding. Utility Model Content

[0004] To address the aforementioned problems, the purpose of this utility model is to provide an automated positioning and pressing, precise welding, and height-adjustable nonwoven fabric spot welding machine. This solves the problems of low efficiency in manual alignment, misalignment of weld points, and inconvenience in equipment adjustment, thereby achieving efficient and stable “( )” shaped welding and sewing of nonwoven fabric.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a non-woven fabric spot welding machine, comprising:

[0006] A frame with a platform on it, and columns fixed on the platform;

[0007] The welding assembly includes an ultrasonic generator, a transducer, an amplitude transformer, and a welding head, which are electrically connected in sequence. The amplitude transformer slides vertically along the column via a slide block. A lifting cylinder is installed on the slide block, and the welding head is installed at the lower end of the amplitude transformer. The lifting cylinder drives the amplitude transformer to move up and down. The slide block is also connected to a lifting motor via a threaded drive. The output shaft of the lifting motor is equipped with a screw. The slide block is fitted with a threaded sleeve, and the screw and the threaded sleeve are threadedly engaged. The slide block is also provided with an open sleeve, which is fitted onto the column and locked by a tightening bolt.

[0008] The positioning welding platform includes a base fixed to the platform, a ring-shaped mold mounted on the base via a rotating shaft, the rotating shaft being driven to rotate by a rotary cylinder; two arc-shaped pressing and positioning plates are symmetrically arranged above the mold, the pressing and positioning plates being connected to a long swing arm via a connecting rod, the long swing arm being driven to swing by a driving swing arm and a swing cylinder to press the non-woven fabric;

[0009] The welding head and the mold are aligned vertically, and the precise ultrasonic welding of non-woven fabric is achieved through the coordinated drive of the lifting cylinder and the lifting motor.

[0010] The slide block is provided with a vertically arranged guide rod, and a guide cover is provided on the guide rod along which it slides. The amplitude rod is installed inside the guide cover.

[0011] A material support tray is set on the base, the mold is fixed on the material support tray, and the lower end of the rotating shaft is connected to the output shaft of the rotating cylinder for transmission.

[0012] The material positioning plate is arc-shaped, and the edge of the material support plate is equipped with mounting seats that correspond one-to-one with the material positioning plate. A swing cylinder is installed on one side of the mounting seat, and a rotating bracket is installed on the other side of the mounting seat. A rotatable long swing arm and two drive swing arms are installed on the rotating bracket. A plug shaft is installed between the two drive swing arms. A connecting block and a transmission sleeve that are fixed to the long swing arm are installed on the plug shaft. The transmission sleeve is connected to the piston rod of the swing cylinder. A connecting rod is connected to the end of the long swing arm, and the material positioning plate is fixedly installed on the connecting rod.

[0013] The welding head and the mold work together to form a “( )” shaped welding seam.

[0014] The beneficial effects of this utility model are: the initial height of the welding head is adjusted by the threaded transmission of the lifting motor; the lifting cylinder drives the welding head to press the fabric for ultrasonic welding and sewing, which can adapt to non-woven fabrics of different thicknesses; the open sleeve locking structure supports precise positioning and quick fixing; the arc-shaped pressing and positioning plate is adapted to the circular mold, and together with the rotating cylinder, it can realize multi-angle welding, improving welding accuracy and efficiency.

[0015] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0016] Figure 1 This is a perspective view of a specific embodiment of the present utility model;

[0017] Figure 2 This is a partial cross-sectional view of a specific embodiment of the present utility model;

[0018] Figure 3 This is a partial exploded view of a specific embodiment of the present utility model;

[0019] Figure 4 for Figure 2 A magnified view of A in the middle.

[0020] Explanation of reference numerals in the attached drawings: 1-Frame, 11-Platform, 12-Column, 2-Ultrasonic generator, 3-Transducer, 4-Amplitude bar, 5-Welding head, 6-Slide block, 61-Threaded sleeve, 62-Open sleeve, 63-Tightening bolt, 7-Lifting cylinder, 8-Lifting motor, 81-Screw, 9-Base, 10-Rotating shaft, 22-Mold, 23-Rotating cylinder, 13-Pressure positioning plate, 14-Connecting rod, 15-Long swing arm, 16-Drive swing arm, 17-Swing cylinder, 18-Guide cover, 19-Material tray, 20-Mounting base, 21-Guide rod. Detailed Implementation

[0021] The present invention will be described in detail below through embodiments, which are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention.

[0022] like Figure 1 — Figure 4 As shown, this embodiment discloses a nonwoven fabric spot welding machine, comprising:

[0023] A frame 1 is provided on which a platform 11 is mounted, and a column 12 is fixed on the platform 11.

[0024] The welding assembly includes an ultrasonic generator 2, a transducer 3, an amplitude transformer 4, and a welding head 5, which are connected in sequence by electricity. The amplitude transformer 4 slides vertically along the column 12 via a slide block 6. A lifting cylinder 7 is installed on the slide block 6. The welding head 5 is installed at the lower end of the amplitude transformer 4. The lifting cylinder 7 drives the amplitude transformer to move up and down to realize the welding and stitching action. The slide block 6 is also connected to a lifting motor 8 via a threaded drive. The output shaft of the lifting motor 8 is equipped with a screw 81. The slide block 6 is equipped with a threaded sleeve 61. The screw 81 and the threaded sleeve 61 are threadedly engaged. The slide block 6 is also provided with an open sleeve 62, which is fitted onto the column 12 and locked by a tightening bolt 63.

[0025] The positioning welding platform includes a base 9 fixed to the platform 11. A circular mold 22 is mounted on the base 9 via a rotating shaft 10. The rotating shaft 10 is driven to rotate by a rotating cylinder 23. Two arc-shaped pressing and positioning plates 13 are symmetrically arranged above the mold 22. The pressing and positioning plates 13 are connected to a long swing arm 15 via a connecting rod 14. The long swing arm 15 is driven to swing via a driving swing arm 16 and a swing cylinder 17 to press the non-woven fabric.

[0026] The welding head 5 corresponds vertically to the mold 22, and the precise ultrasonic welding of non-woven fabric is achieved through the coordinated drive of the lifting cylinder 7 and the lifting motor 8.

[0027] A vertically arranged guide rod 21 is provided on the slide block 6, and a guide cover 18 is provided on the guide rod 21 along which it slides. The amplitude rod 4 is installed inside the guide cover 18.

[0028] A material support tray 19 is provided on the base 9, the mold 22 is fixed on the material support tray, and the lower end of the rotating shaft 10 is connected to the output shaft of the rotating cylinder 23 for transmission.

[0029] The pressing and positioning plate 13 is arc-shaped. The edge of the material support plate 19 is provided with mounting seats 20 that correspond one-to-one with the pressing and positioning plate 13. A swing cylinder 17 is installed on one side of the mounting seat, and a rotating bracket is provided on the other side of the mounting seat 20. A rotatable long swing arm and two drive swing arms 16 are installed on the rotating bracket. A shaft is installed between the two drive swing arms 16. A connecting block and a transmission sleeve that are fixed to the long swing arm 15 are installed on the shaft. The transmission sleeve is connected to the piston rod of the swing cylinder 17. A connecting rod 14 is connected to the end of the long swing arm 15. The pressing and positioning plate 13 is fixedly installed on the connecting rod 14.

[0030] The welding head 5 and the mold 22 cooperate to form a “( )” shaped welding seam.

[0031] Working process: 1. Loading and initial positioning: The operator lays two layers of non-woven fabric to be welded (such as the PP non-woven fabric surface layer and the meltblown inner layer of a mask) flat on the upper surface of the mold 22, ensuring that the welding areas (edges to be sewn) of the two layers of non-woven fabric are aligned and cover the welding reference surface of the mold 22.

[0032] 2. Initial height adjustment: Based on the thickness of the nonwoven fabric or the height of the mold (e.g., a total thickness of 0.2mm for both layers), the operator starts the lifting motor 8 through the control panel. The lifting motor 8 drives the screw 81 to rotate. The screw 81 engages with the threaded sleeve 61 of the slide block 6, causing the slide block 6 to slowly move down along the column 12. The welding head 5 is adjusted to the initial position about 100mm away from the surface of the nonwoven fabric (a preset safety distance to avoid direct contact and damage to the nonwoven fabric). Then, the loosening bolt 63 is tightened to lock the opening sleeve 62, fixing the initial height of the slide block 6.

[0033] 3. Pressing and positioning: The swing cylinder 17 is activated, the piston rod extends and pushes the drive swing arm 16 to swing towards the center of the mold 22, which drives the long swing arm 15 to rotate around the hinge point. Then, through the connecting rod 14, the two pressing and positioning plates 13 are driven to press down synchronously onto the outer circumference of the mold 22, pressing and fixing the non-woven fabric onto the mold 22 (the pressing force is adjusted by the thrust of the swing cylinder 17 to ensure that the non-woven fabric does not slip but is not excessively deformed).

[0034] 4. Welding execution: The lifting cylinder 7 is activated, and the piston rod retracts, causing the amplitude transformer 4 and the welding head 5 to slide downward with the guide cover 18, pressing the welding head 5 onto the non-woven fabric. At the same time, the ultrasonic generator 2 is powered on to generate a high-frequency vibration of 28kHz, which is amplified by the transducer 3 and the amplitude transformer 4 and transmitted to the welding head 5, causing the two layers of non-woven fabric to melt and bond together under pressure and vibration, forming a continuous welded seam in the shape of "( )" (the weld depth penetrates into the non-woven fabric fiber layer).

[0035] 5. Angle adjustment: If a circumferential weld is required (such as the full circumferential stitching of the edge of a mask), start the rotary cylinder 23 to drive the rotary shaft 10 to rotate 90° (or set the angle), which will drive the mold 22 and the pressure plate 13 to rotate synchronously. After adjusting the welding position, repeat step 4 to complete the multi-directional welding.

[0036] 6. Reset and material removal: After welding is completed, the piston rod of the lifting cylinder 7 extends and the welding head 5 moves upward; the piston rod of the swing cylinder 17 retracts and the pressure positioning plate 13 is lifted. The operator loosens the tightening bolt 63 and manually moves the slide 6 to the initial position (or adjusts it in the opposite direction through the lifting motor 8). Finally, the welded non-woven fabric product is taken out.

[0037] III. Explanation of the connection relationship of key components: Vertical guidance and drive of welding components: The amplitude rod 4 achieves precise sliding through the guide cover; the lifting motor 8 adjusts the initial height of the welding head 5 through the thread transmission of the screw 81 and the threaded sleeve 61; the lifting cylinder 7 controls the downward welding action of the welding head 5 through the extension and retraction of the piston rod; the opening sleeve 62 and the tightening bolt 63 help fix the adjusted position.

[0038] Swing control of the pressure positioning plate: The swing cylinder 17 transmits linear motion to the long swing arm 15 through the drive swing arm 16, transmission sleeve and insert shaft. When the long swing arm 15 swings around the hinge point, it drives the pressure positioning plate 13 to press down or lift synchronously through the connecting rod 14, so as to achieve stable pressing of non-woven fabric.

[0039] Rotation adjustment function: The rotating shaft 10 is connected to the base 9 through a deep groove ball bearing, and the lower end is driven by the output shaft of the rotating cylinder 23 through a coupling, ensuring that the mold 22 can be accurately rotated to the set angle to adapt to different welding trajectory requirements.

[0040] This embodiment achieves height adjustment through the division of labor and cooperation between the lifting motor 8 and the lifting cylinder 7 (the former adjusts the initial height, and the latter controls the welding pressure). Combined with the automated clamping and positioning and rotary welding structure, it significantly improves the accuracy, efficiency and adaptability of non-woven spot welding, and is particularly suitable for the large-scale production of non-woven products such as masks.

Claims

1. A non-woven fabric spot welding machine, characterized in that, include: A frame (1) is provided on which a platform (11) is provided, and a column (12) is fixed on the platform (11). The welding assembly includes an ultrasonic generator (2), a transducer (3), an amplitude transformer (4), and a welding head (5) connected in sequence. The amplitude transformer (4) slides vertically along the column (12) via a slide block (6). A lifting cylinder (7) is installed on the slide block (6). The welding head (5) is installed at the lower end of the amplitude transformer (4). The lifting cylinder (7) drives the amplitude transformer to move up and down. The slide block (6) is also connected to a lifting motor (8) via a threaded drive. The output shaft of the lifting motor (8) is equipped with a screw (81). The slide block (6) is fitted with a threaded sleeve (61). The screw (81) and the threaded sleeve (61) are threadedly engaged. The slide block (6) is provided with an open sleeve (62). The open sleeve (62) is fitted onto the column (12) and locked by a tightening bolt (63). The positioning welding platform includes a base (9) fixed to the platform (11), and a ring-shaped mold (22) is installed on the base (9) via a rotating shaft (10). The rotating shaft (10) is driven to rotate by a rotating cylinder (23). Two arc-shaped pressing positioning plates (13) are symmetrically arranged above the mold (22). The pressing positioning plates (13) are connected to a long swing arm (15) via a connecting rod (14). The long swing arm (15) is driven to swing via a driving swing arm (16) and a swing cylinder (17) to press the non-woven fabric. The welding head (5) corresponds vertically to the mold (22), and the precise ultrasonic welding of non-woven fabric is achieved by the coordinated drive of the lifting cylinder (7) and the lifting motor (8).

2. The nonwoven fabric spot welding machine according to claim 1, characterized in that, The slide block (6) is provided with a vertically arranged guide rod (21), and a guide cover (18) that slides along the guide rod (21) is provided on the guide rod (21). The amplitude rod (4) is installed inside the guide cover (18).

3. The nonwoven fabric spot welding machine according to claim 1, characterized in that, The base (9) is provided with a material support plate (19), the mold (22) is fixed on the material support plate, and the lower end of the rotating shaft (10) is connected to the output shaft of the rotating cylinder (23) for transmission.

4. The nonwoven fabric spot welding machine according to claim 1, characterized in that, The pressing and positioning plate (13) is arc-shaped. The edge of the material tray (19) is provided with mounting seats (20) that correspond one-to-one with the pressing and positioning plate (13). A swing cylinder (17) is installed on one side of the mounting seat, and a rotating bracket is provided on the other side of the mounting seat (20). A rotatable long swing arm and two drive swing arms (16) are installed on the rotating bracket. A plug shaft is installed between the two drive swing arms (16). A connecting block and a transmission sleeve are installed on the plug shaft and are fixedly connected to the long swing arm (15). The transmission sleeve is connected to the piston rod of the swing cylinder (17). A connecting rod (14) is connected to the end of the long swing arm (15). The pressing and positioning plate (13) is fixedly installed on the connecting rod (14).

5. The nonwoven fabric spot welding machine according to claim 1, characterized in that, The welding head (5) and the mold (22) cooperate to form a "( )" shaped welding seam.

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