A mask welding headset with a cam mechanism

Abstract

The present invention relates to the technical field of mask production equipment, and in particular to a mask welding earphone with a cam mechanism. It includes a frame; an ear wire conveying device provided on the frame for conveying ear wires to welding points; an ear wire spot welding device for welding the ear wires conveyed by the ear wire conveying device; and a cam connecting rod mechanism connected to the ear wire spot welding device and used to control the movement of the ear wire spot welding device in the vertical direction. The present invention provides a mask welding earphone, which adopts a cam connecting rod mechanism to control the movement of the ear wire spot welding device in the vertical direction. Its action is accurate and reliable, the structure is simple and compact, the transmission efficiency is high, and the precision is high. In order to make the various processing steps of welding earphones better coordinated, the transmission of the clamping mechanism is also arranged on the same transmission shaft and the cam mechanism is still used to control its movement, so that the mechanism has good correlation, the processing rhythm is compact, the interval waiting time of each link is reduced, and the production efficiency of the mask is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of mask production equipment, and in particular to a mask welding headset with a cam mechanism. Background Art

[0002] Masks are sanitary products, typically worn over the nose and mouth to filter air, blocking harmful gases, odors, droplets, viruses, and other substances. They are also a method of preventing respiratory infections. They typically have ear straps welded to both ends, with each ear strap welded to the top and bottom of the mask body. However, existing mask machines only allow for manual welding of the ear straps. The operator then flips the mask head and welds the other side. This manual operation results in very low production efficiency.

[0003] Patent number CN111251618A, patent name "A ear strap welding device for mask production", and its publication date is June 9, 2020. It discloses an ear strap welding device for mask production, including a base, a sliding adjustment mechanism and a positioning mechanism. Ear strap rolls are installed on both sides of the upper part of the base, and a reeling shaft is provided in the middle of the ear strap roll. An ear strap strip is provided on the outside of the ear strap roll, and an ear strap feeding mechanism is installed on the side of the ear strap strip close to the center line of the base. Support columns are installed at both ends of the upper part of the base, and a top plate is fixed above the support column. A cylinder is installed below the middle of the top plate, and a lifting plate is fixed below the cylinder. Connecting blocks are installed on both sides of the lower part of the lifting plate, and a welding head is fixed below the connecting block.

[0004] The aforementioned patent effectively addresses the low production efficiency of manual operations. The device utilizes a pneumatic cylinder to facilitate the lifting of a lifting plate, thereby controlling the lifting of the welding head. The welding head and cutting blade work together to precisely cut the middle of the ear strap and simultaneously weld the mask. However, the drawbacks of using a pneumatic cylinder to drive the lifting are low precision, long travel time, slow speed, low transmission efficiency, and a complex and noisy control system. Summary of the Invention

[0005] In order to solve the problem of long travel time and slow speed in the welding lifting mechanism of the mask welding earphone driven by a cylinder in the above-mentioned prior art, the present invention provides a mask welding earphone with a cam mechanism, comprising a frame; an ear wire conveying device provided on the frame for conveying the ear wire to the welding point; an ear wire spot welding device for welding the ear wire conveyed by the ear wire conveying device; and a cam connecting rod mechanism connected to the ear wire spot welding device and used to control the movement of the ear wire spot welding device in the vertical direction.

[0006] On the basis of the above technical solution, the ear wire conveying device further includes a pulling mechanism for pulling the ear wire, a distance-fixing mechanism for limiting the pulling distance of the ear wire, a cutting mechanism for cutting the ear wire after the distance is fixed, and a clamping mechanism for clamping the ear wire and placing the two ends of the ear wire in a welding position after the ear wire is cut.

[0007] On the basis of the above technical solution, further, the wire pulling mechanism includes a wire device fixed on the frame and a driving device for providing power to the wire device; the wire device is used to transmit the ear wire to the distance mechanism.

[0008] On the basis of the above technical solution, the distance-fixing mechanism further includes a guide rail device arranged at the bottom of the frame, a wire pulley arranged above the guide rail device, and an air claw structure arranged on the guide rail device, wherein the air claw structure is used to grab the ear wire and move the ear wire to the wire cutting position.

[0009] On the basis of the above technical solution, further, the thread cutting mechanism includes a scissors assembly for cutting the thread and a cylinder driving the scissors assembly to cut.

[0010] On the basis of the above technical solution, further, the ear wire spot welding device includes an ultrasonic welding head arranged below the cam connecting rod mechanism, and a welding pressing mold used in conjunction with the ultrasonic welding head.

[0011] On the basis of the above technical solution, further, the cam-linkage mechanism includes a transmission shaft arranged on the frame, a plurality of first disc cams arranged on the transmission shaft, and a first follower for connecting the ear wire spot welding device and the first disc cams.

[0012] On the basis of the above technical solution, further, the cam-link mechanism is further provided with a second disc cam for driving the clamping mechanism to move in the vertical direction and a second follower for connecting the clamping mechanism and the second disc cam.

[0013] On the basis of the above technical solution, further, a cylindrical cam is provided on the cam-link mechanism, and the clamping mechanism uses the cylindrical cam to make the ear wire rotate from the distance mechanism to the welding position.

[0014] On the basis of the above technical solution, further, the cam-linkage mechanism also includes an elastic structure provided on the frame for assisting in driving the cam-linkage mechanism to rise through a spring.

[0015] The mask welding earphones with a cam mechanism provided by the present invention have the following advantages compared with the existing technology: a cam connecting rod mechanism is used to control the vertical movement of the ear wire spot welding device, its action is accurate and reliable, the structure is simple and compact, the transmission efficiency is high, the precision is high, the production efficiency is improved, and it is conducive to the mass production of the product.

[0016] In order to make the various processing steps of welding earphones better coordinated, the transmission of the clamping mechanism is also set on the same transmission shaft and the cam mechanism is still used to control its movement, so that the mechanism is well correlated and the various welding processing actions are linked to each other. The processing rhythm is compact, the waiting time between each link is reduced, and the production efficiency of the mask is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0018] Figure 1 A schematic diagram of the three-dimensional structure of a mask welding headset with a cam mechanism provided by the present invention;

[0019] Figure 2 This is another schematic diagram of the three-dimensional structure of a mask welding headset with a cam mechanism provided by the present invention;

[0020] Figure 3 This is a front view of a mask welding headset with a cam mechanism provided by the present invention.

[0021] Reference numerals:

[0022] 100 rack 200 ear wire conveyor 300 ear wire spot welding device

[0023] 400 cam-link mechanism 210 wire-pulling mechanism 220 fixed-distance mechanism

[0024] 230 Wire cutting mechanism 240 Clamping mechanism 211 Wire guide device

[0025] 212 driving device 221 guide rail device 222 wire pulley

[0026] 223 air claw structure 231 scissor assembly 232 cylinder

[0027] 310 ultrasonic welding head 320 welding die 411 transmission shaft

[0028] 412 first disc cam 413 first follower 414 second disc cam

[0029] 415 second follower 416 cylindrical cam 417 elastic structure DETAILED DESCRIPTION

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] The present invention provides a mask welding earphone with a cam mechanism, comprising: a frame 100; an ear wire conveying device 200 provided on the frame 100 for conveying the ear wire to a welding point; an ear wire spot welding device 300 for welding the ear wire conveyed by the ear wire conveying device 200; and a cam connecting rod mechanism 400 connected to the ear wire spot welding device 300 and used to control the vertical movement of the ear wire spot welding device 300.

[0033] When implementing it specifically, Figure 1-3 As shown, the mask welding earphone includes a frame 100; an ear wire conveying device 200 provided on the frame 100 for conveying the ear wire to the welding point; an ear wire spot welding device 300 for welding the ear wire conveyed by the ear wire conveying device 200; and a cam connecting rod mechanism 400 connected to the ear wire spot welding device 300 and used to control the movement of the ear wire spot welding device 300 in the vertical direction. After the ear wire reaches the welding position, the ear wire spot welding device 300 is driven by the cam connecting rod mechanism 400 to weld the welding position. Of course, the device also includes a mask conveying device, such as a tray that can hold a single mask on the conveyor belt, and the ears of each mask are welded by the conveyor belt, thereby achieving automation. All of these belong to the existing technology that can be understood by those skilled in the art and will not be described in detail here.

[0034] The present invention provides a mask welding earphone with a cam mechanism, which adopts a cam connecting rod mechanism to control the vertical movement of the ear wire spot welding device 300. The operation is accurate and reliable, the structure is simple and compact, the transmission efficiency is high, the precision is high, the production efficiency is improved, and it is conducive to the mass production of the product.

[0035] Preferably, the ear wire delivery device 200 includes a pulling mechanism 210 for pulling the ear wire, a distance-fixing mechanism 220 for limiting the pulling distance of the ear wire, a cutting mechanism 230 for cutting the ear wire after the distance is fixed, and a clamping mechanism 240 for clamping the ear wire and placing the two ends of the ear wire in a welding position after the ear wire is cut.

[0036] When implementing it specifically, Figure 2 As shown, the ear wire conveying device 200 includes a wire pulling mechanism 210 for pulling the ear wire, which is mounted on the frame 100; a distance setting mechanism 220 for limiting the distance the ear wire is pulled; a wire trimming mechanism 230 for cutting the ear wire after the distance is set; and a clamping mechanism 240 for clamping the ear wire and positioning both ends of the wire at the welding point after cutting. The ear wire is conveyed from the wire pulling mechanism 210 to the distance setting mechanism 220, where it is pulled to a fixed length. The wire trimming mechanism 230 then trims the wire. Finally, the clamping mechanism 240 transports the trimmed wire to the welding position. The entire ear wire conveying device 200 operates in this sequential manner.

[0037] Preferably, the wire pulling mechanism 210 includes a wire guide device 211 fixed on the frame 100 and a driving device 212 for providing power to the wire guide device 211 ; the wire guide device 211 is used to transmit the ear wire to the distance mechanism 220 .

[0038] In specific implementation, the wire-pulling mechanism 210 includes a wire guide 211 fixed to the frame 100 and a drive device 212 for powering the wire guide 211. The wire guide 211 is used to transmit the ear wire to the spacing mechanism 220. Guided and clamped by the wire guide 211, as a preferred embodiment, the wire guide 211 is equipped with a wire rod, a traction wheel, a guide wheel, and a tension adjustment device for adjusting the tension of the ear wire. This ensures consistent tension during ear wire delivery, thereby ensuring a consistent and stable ear wire supply.

[0039] Preferably, the distance mechanism 220 includes a guide rail device 221 arranged at the bottom of the frame 100, a wire pulley 222 arranged above the guide rail device 221, and an air claw structure 223 arranged on the guide rail device 221, wherein the air claw structure 223 is used to grab the ear wire and move the ear wire to the wire cutting position.

[0040] In specific implementation, the spacing mechanism 220 includes a guide rail device 221 arranged at the bottom of the frame 100, and a wire wheel 222 arranged above the guide rail device 221, and the wire wheel 222 is used to fix one end of the ear wire; it also includes an air claw structure 223 arranged on the guide rail device 221, and the air claw structure 223 is used to grab the ear wire at one end of the wire wheel 222 and move it through the guide rail device 221 to a fixed position, and the distance it moves is the length of the mask ear wire.

[0041] Preferably, the thread cutting mechanism 230 includes a scissor assembly 231 for cutting the thread and a cylinder 232 for driving the scissor assembly 231 to cut.

[0042] In practice, the thread trimming mechanism 230 is located at one end of the wire guide wheel 222 and comprises a scissor assembly 231 for trimming the wire and a pneumatic cylinder 232 for driving the scissor assembly 231 to cut. The scissor assembly 231 comprises two interlocking, hinged blades. Once the spacing mechanism 220 is complete, i.e., the pneumatic gripper structure grasps the wire at one end of the wire guide wheel 222 and moves it to a fixed position, the pneumatic cylinder 232 drives the scissor assembly 231 to cut the wire.

[0043] Preferably, the ear wire spot welding device 300 includes an ultrasonic welding head 310 disposed below the cam-link mechanism 400 , and a welding die 320 used in conjunction with the ultrasonic welding head 310 .

[0044] When implementing it specifically, Figure 1 As shown, the ear wire spot welding device 300 includes an ultrasonic welding head 310 positioned below the cam linkage mechanism 400, and a welding die 320 used in conjunction with the ultrasonic welding head 310. When the cam linkage mechanism 400 drives the welding die 320 downward, the ear wire and the mask body are pressed together, preventing the mask from falling off during the ear welding process, thereby ensuring the quality of the ear wire welding. When the cam linkage mechanism 400 drives the ultrasonic welding head 310 downward to the welding position, the ear wire is spot welded.

[0045] Preferably, the cam-linkage mechanism 400 includes a transmission shaft 411 provided on the frame 100 , a plurality of first disc cams 412 provided on the transmission shaft 411 , and a first follower 413 for connecting the ear wire spot welding device 300 and the first disc cams 412 .

[0046] When implementing it specifically, Figure 1As shown, due to the short travel of the ear wire spot welding, the rotation of a plurality of first disc cams 412 disposed on a transmission shaft 411 drives the first follower 413 to move vertically, thereby enabling the ear wire spot welding device 300 and the ultrasonic welding head 310 to coordinate vertical movement to complete the spot welding operation. As a preferred embodiment, the transmission shaft 411 is driven by a motor via a belt drive.

[0047] Preferably, the cam-link mechanism 400 is further provided with a second disc cam 414 for driving the clamping mechanism 240 to move in the vertical direction and a second follower 415 for connecting the clamping mechanism 240 and the second disc cam 414 .

[0048] In specific implementation, the second disc cam 414 is set on the transmission shaft 411, and the rotation of the two drives the second follower 415 to move in the vertical direction, so that the clamping mechanism 240 completes the vertical movement. As an advantage, the first follower 413 and the second follower 415 can be flat-bottomed followers, as shown in the attached figure. Figure 1 The flat-bottomed square structure shown has support rods on both symmetrical sides for connecting the actuator to ensure smooth force and movement, thereby ensuring transmission efficiency.

[0049] Preferably, a cylindrical cam 416 is provided on the cam-link mechanism 400 , and the clamping mechanism 240 uses the cylindrical cam 416 to move the ear wire from the distance mechanism 220 to the welding position.

[0050] When implementing it specifically, Figure 1 As shown, the cam-link mechanism 400 is provided with a cylindrical cam 416, which is used by the clamping mechanism 240 to rotate the ear wire from the distance mechanism 220 to the welding position. The cylindrical cam 416 can be disposed on the transmission shaft 411. Through its rotation, the corresponding follower is driven to move left and right. The follower is connected to the clamping mechanism 240, and the clamping mechanism 240 is connected to the follower. As a result, the clamping mechanism 240 swings around the follower. The stroke design of the cylindrical cam 416 allows the clamping mechanism 240 to rotate 180 degrees, thereby clamping the ear wire from the distance mechanism 220 to the welding position.

[0051] Preferably, the cam-linkage mechanism 400 further includes an elastic structure 417 provided on the frame 100 for assisting in driving the cam-linkage mechanism 400 to rise via a spring.

[0052] In a specific implementation, the cam linkage mechanism 400 further includes an elastic structure 417 disposed on the frame 100, which assists in driving the cam linkage mechanism 400 upwards via a spring. The elastic structure 417 ensures that the first follower 413 and the second follower 415 always maintain a tangential relationship with the outer circumference of the cam, thereby ensuring a more stable and reliable cam transmission. The elastic structure 417 also includes an adjustment device for adjusting the spring force, allowing the spring force to be adjusted according to actual operating requirements.

[0053] Although the present invention frequently uses terms such as frame, wire feeding device, wire spot welding device, cam-link mechanism, wire pulling mechanism, distance mechanism, wire cutting mechanism, driving device, air gripper structure, ultrasonic welding head, first disc cam, second follower, clamping mechanism, guide rail device, scissor assembly, welding die, first follower, cylindrical cam, wire guide device, wire pulley, cylinder, transmission shaft, second disc cam, elastic structure, etc., the use of other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations is contrary to the spirit of the present invention.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A mask welding headset with a cam mechanism, characterized in that: include: rack(100); An ear wire conveying device (200) is provided on the frame (100) for conveying the ear wire to the welding point; the ear wire conveying device (200) comprises a pulling mechanism (210) for pulling the ear wire, a distance setting mechanism (220) for limiting the pulling distance of the ear wire, a cutting mechanism (230) for cutting the ear wire after the distance is set, and a clamping mechanism (240) for clamping the ear wire and placing both ends of the ear wire in the welding position after the ear wire is cut; An ear wire spot welding device (300) for welding ear wires transported by an ear wire transport device (200); the ear wire spot welding device (300) comprises an ultrasonic welding head (310) disposed below a cam connecting rod mechanism (400), and a welding die (320) used in conjunction with the ultrasonic welding head (310); A cam-link mechanism (400) is connected to the ear wire spot welding device (300) and is used to control the movement of the ear wire spot welding device (300) in the vertical direction; the cam-link mechanism (400) comprises a transmission shaft (411) arranged on the frame (100), a plurality of first disc-shaped cams (412) arranged on the transmission shaft (411), and a first follower (413) for connecting the ear wire spot welding device (300) and the first disc-shaped cams (412); the plurality of first disc-shaped cams (412) and the first follower (413) respectively drive the ultrasonic welding head (31 0) and the welding die (320) move up and down; the cam-link mechanism (400) is further provided with a second disc-shaped cam (414) for driving the clamping mechanism (240) to move in the vertical direction, and a second follower (415) for connecting the clamping mechanism (240) and the second disc-shaped cam (414); the cam-link mechanism (400) is provided with a cylindrical cam (416), which is arranged on the transmission shaft (411); the clamping mechanism (240) is driven by the cylindrical cam (416) to rotate the ear wire from the spacing mechanism (220) to the welding position.

2. The mask welding headset with a cam mechanism according to claim 1, characterized in that: The wire pulling mechanism (210) comprises a wire guide device (211) fixed on the frame (100) and a driving device (212) for providing power to the wire guide device (211); the wire guide device (211) is used to transmit the ear wire to the distance-fixing mechanism (220).

3. The mask welding headset with a cam mechanism according to claim 1, characterized in that: The distance-fixing mechanism (220) comprises a guide rail device (221) arranged at the bottom of the frame (100), a wire pulley (222) arranged above the guide rail device (221), and an air claw structure (223) arranged on the guide rail device (221). The air claw structure (223) is used to grab the ear wire and move the ear wire to a trimming position.

4. The mask welding headset with a cam mechanism according to claim 1, characterized in that: The thread cutting mechanism (230) comprises a scissor assembly (231) for cutting the thread and a cylinder (232) for driving the scissor assembly (231) to cut the thread.

5. The mask welding headset with a cam mechanism according to claim 1, characterized in that: The cam-link mechanism (400) further includes an elastic structure (417) disposed on the frame (100) and used to assist in driving the cam-link mechanism (400) to rise via a spring.

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