Automatic Mask Earloop Welder

Abstract

The present invention discloses an automatic mask earband welding machine, which includes a frame. The upper part of the frame is an equipment platform. On the equipment platform, there are provided a mask conveying mechanism, a wire feeding mechanism, a wire winding mechanism, a wire cutting mechanism, a welding mechanism, a palletizing mechanism and a controller. The wire feeding mechanism, the wire winding mechanism, the wire cutting mechanism and the welding mechanism are arranged above the mask conveying mechanism, and the palletizing mechanism is arranged at the output end of the mask conveying mechanism. The mask conveying mechanism includes two sprocket supports, a driving double sprocket and a driven double sprocket. Between the driving double sprocket and the driven double sprocket, there are provided two parallel and tensioned chains. All the two chains are located above the tabletop of the equipment platform. On the two chains, a number of flat mask carriers are evenly laid horizontally. The beneficial effects are that high transmission positioning accuracy can be achieved, the average transmission ratio is accurate, the transmission is stable, the efficiency is high; the transmitted power is large, the overload capacity is strong, the high-speed performance is excellent, and it is convenient for maintenance and debugging.

Description

Technical Field

[0001] The present invention relates to the technical field of mask ear strap machines, and particularly to an automatic mask ear strap welding machine. Background Art

[0002] A mask is a personal hygiene protection product, which is worn over the mouth and nose to filter the air entering and leaving the mouth and nose, so as to block harmful gases, droplets, dust, viruses, etc. from entering and leaving the mouth and nose of the wearer, and has a certain filtering effect on the air entering the lungs. It is usually made of gauze, melt-blown cloth, non-woven fabric, etc. When respiratory infectious diseases are prevalent or when working in a polluted environment such as dust, germs, dust, etc. in the air can enter the human lungs through breathing, causing serious damage to the body. Wearing a mask can play a certain filtering role. A mask generally includes a mask body and ear straps. The ear straps are fixed on the left and right sides of the mask body at a total of four fixed points. When people wear a mask, the mask is worn on the face by hanging the ear straps on both ears.

[0003] In the production of existing masks, they are generally produced by a mask machine, and the connection method between the ear straps and the mask body is generally welded by a mask welding machine.

[0004] At present, a Chinese patent document with the publication number CN206825942U discloses an ear strap machine, which includes a frame. A mask body conveying device, an ear strap storage device, a welding device and a collection device are arranged on the frame. The mask body conveying device includes a mask body placement box arranged at one end of the frame, and a conveying device correspondingly arranged on the frame; a corresponding pressing device is arranged on the frame; the conveying device in the mask body conveying device includes a motor arranged on the frame and two rotating shafts arranged on the frame. A conveyor belt is connected between the rotating shafts, and a plurality of conveying discs are evenly arranged on the conveyor belt; an outlet is arranged on one side of the lower end of the mask body placement box, and the outlet corresponds to the conveying disc. The invention has a reasonable design. The mask body and the ear straps are conveyed together by the equipment and then welded by a welding machine. The whole process adopts automatic control, with a high degree of automation, reducing the labor intensity of workers and improving the production efficiency.

[0005] Although the above-mentioned ear strap machine improves the production efficiency to a certain extent, since its mask body conveying device uses a general belt conveyor, the lower part of the conveyor belt needs to be wound under the frame, and the motor uses a common motor, so its conveying stroke is long and the production efficiency during processing is low. The conveyor belt is not rigidly connected, has a low tension and is prone to deformation, resulting in the inability to achieve precise positioning of the mask body conveying, and it is extremely easy to cause deviation in the positions of the mask body and the ear straps during welding, so that the unqualified rate is very high; in addition, the existing welding mechanisms on the market have a loose and not compact structure, and the cooperation rhythm of each action is slow, resulting in low production efficiency. Summary of the Invention

[0006] The object of the present invention is to provide an automatic mask earband welding machine. The conveying mechanism adopts double chains to convey the mask carriers and is driven by a servo motor, with high positioning accuracy. The welding mechanism is compact and has fast movement, thus overcoming the deficiencies of the above-mentioned prior art.

[0007] The technical solution of the present invention is an automatic mask earband welding machine, which includes a frame. The upper part of the frame is an equipment platform. On the equipment platform, there are a mask conveying mechanism, a wire inlet mechanism, a wire winding mechanism, a wire cutting mechanism, a welding mechanism, a palletizing mechanism and a controller. The wire inlet mechanism, the wire winding mechanism, the wire cutting mechanism and the welding mechanism are arranged above the mask conveying mechanism. The palletizing mechanism is arranged at the output end of the mask conveying mechanism. The mask conveying mechanism includes two sprocket supports oppositely arranged on the equipment platform. On the two sprocket supports, there are respectively a driving double sprocket and a driven double sprocket. On both sides of the driving double sprocket and the driven double sprocket, there are respectively transmission gears. Between the driving double sprocket and the driven double sprocket, there are two parallel and tensioned chains. The two chains are respectively engaged with the transmission gears of the driving double sprocket and the driven double sprocket. The two chains are all located above the tabletop of the equipment platform. On the two chains, there are several flat mask carriers evenly laid horizontally. The two sides of the mask carrier are respectively fixed on the two chains. The mask carrier is used for loading the mask body and pausing when conveying it to the lower part of the welding mechanism to facilitate the earband of the mask to be welded to the mask body. The width of the mask carrier is smaller than that of the mask body. When the mask carrier loads the mask body, the welding part of the earband and the mask body is located outside the two sides of the mask carrier. One side of the driving double sprocket is provided with a sprocket servo motor for driving the driving double sprocket to rotate. The rotation of the driving double sprocket can drive the two chains to rotate synchronously, so that the mask carrier is circulated and conveyed. The sprocket servo motor precisely controls the conveying and positioning of the mask carrier by precisely driving the rotation angle of the driving double sprocket.

[0008] Preferably, a first photoelectric sensor is arranged on one side of the two chains. The first photoelectric sensor is used to detect the positioning device arranged on the chain. When the first photoelectric sensor detects the positioning device, the sprocket servo motor immediately stops rotating to accurately position the mask carrier.

[0009] Preferably, a main bracket is provided above the two chains on the equipment platform. An upper platform is provided at the upper part of the main bracket. The wire inlet mechanism includes two identical wire inlet modules, which are respectively arranged on both sides of the upper platform. The wire inlet module includes a vertical wire inlet bracket. A guide wheel for hanging the earband, a wire pulling wheel, a pressing wheel, an adjusting wheel and a wire outlet wheel are sequentially arranged on the wire inlet bracket. The wire pulling wheel is driven to rotate by a wire pulling motor. The pressing wheel presses the earband against the wire pulling wheel. The adjusting wheel can move up and down along the guide rail. The guide wheel guides the earband in from the outside, pulls it downward through the wire pulling wheel and the pressing wheel. The adjusting wheel can tension the earband downward by gravity. The wire outlet wheel changes the direction of the earband and then guides it downward to the wire winding mechanism.

[0010] Preferably, a main bracket is provided above the two chains on the equipment platform. An upper platform is provided at the upper part of the main bracket. The welding mechanism includes a lower welding die and an upper welding die which are opposite to each other up and down. The lower welding die is fixedly arranged on both sides of the mask carrier. The upper plane of the lower welding die is flush with the plane of the mask carrier. The lower end of the lower welding die is connected to a transducer, and the transducer is connected to an ultrasonic generator. The transducer and the ultrasonic generator are arranged on the frame under the equipment platform. There are four identical upper welding dies, which are respectively connected to the lower ends of four connecting columns arranged above both sides of the mask carrier. The four connecting columns are driven by a main cylinder arranged on the upper platform to move up and down. The four connecting columns can synchronously move downward to drive the upper welding die to press the welding parts of the mask body and the earband downward to contact the upper plane of the lower welding die at the same time. The transducer converts electrical energy into ultrasonic vibration energy and transmits it to the lower welding die. When the lower welding die and the upper welding die are pressed together, heat is generated due to friction caused by vibration. After a certain period of time, the lower welding die and the upper welding die jointly weld the end of the earband and the mask body together.

[0011] Preferably, a plurality of uniformly distributed dot-like protrusions are provided on the lower plane of the upper welding die. The dot-like protrusions are used to change the full-plane welding of the welding part of the earband and the mask body into multi-point welding.

[0012] Preferably, the wire winding mechanism includes a movable platform and two symmetrically arranged wire winding discs under the movable platform. The four connecting columns vertically pass through the movable platform. Retaining rings are respectively arranged on the upper parts of the four connecting columns. Buffer springs are sleeved on the four connecting columns between the retaining rings and the movable platform. The two wire winding discs can be driven by wire winding servo motors to rotate on the horizontal plane. The wire winding servo motors are fixed on the movable platform. One rotation of 180 degrees of the wire winding disc can complete one wire winding action, and continuing to rotate 180 degrees can complete the next wire winding action.

[0013] Preferably, ear tape clips are respectively provided on both sides of the parts of the two winding reels where the ear tapes are to be cut. A pressing block is provided above the ear tape clips. The pressing block is driven by a pressing air cylinder fixed on the movable platform to move up and down. An inclined surface is provided at the bottom of the pressing block. When the pressing block moves downward, the inclined surface touches the clamping end of the ear tape clip to clamp the ear tape. On the other side of the pressing block relative to the winding reel rotating shaft, a releasing block is provided. The releasing block is driven by a releasing air cylinder fixed on the movable platform to move up and down. When the releasing block moves downward, it touches the releasing end of the ear tape clip to release the ear tape.

[0014] Preferably, the wire cutting mechanism includes scissors, a scissors driving motor, a scissors driving air cylinder, and a scissors support. The scissors support is arranged on the equipment platform and located on both sides of the two chains. The scissors driving air cylinder is arranged on the scissors support along the direction parallel to the chains. The scissors and the scissors driving motor are simultaneously driven by the scissors driving air cylinder to move back and forth. One blade of the scissors is fixed, and the other blade is driven by the scissors driving motor to rotate. After the winding mechanism completes one winding action, the scissors extend towards the winding mechanism to cut the ear tape and then reset.

[0015] Preferably, the palletizing mechanism includes a first support and a second support which are arranged relatively parallel. Horizontally arranged upper pulley groups and lower pulley groups are respectively provided on the opposite inner sides of the first support and the second support. Each pulley group includes a belt and two pulleys connected by the belt. The lower part of the upper belt of the upper pulley group and the upper part of the lower belt of the lower pulley group are in contact with each other. The two opposite pulleys on the first support and the second support are arranged on the same driving shaft. The driving shaft drives the belts of all pulley groups to rotate synchronously under the drive of the palletizing motor. The two sides of the mask finished products with the ear tapes welded are respectively fed into the contact part of the upper belt and the lower belt and are clamped and conveyed forward by the upper and lower belts. On the inner sides of the first support and the second support, two relatively protruding supporting platforms are respectively provided in front of the upper and lower pulley groups. The two supporting platforms are used to support the mask finished products conveyed by the upper and lower pulley groups on the left and right sides. A third support is bridged above the supporting platforms on the first support and the second support. A pressing air cylinder is provided on the third support. A pressing plate is provided below the third support and in the middle of the two supporting platforms. The pressing air cylinder drives the pressing plate to move up and down to press and palletize the mask finished products supported by the supporting platforms in sequence.

[0016] Preferably, a fourth bracket is provided on the first bracket or the second bracket. A second photoelectric sensor is provided above the pulley group on the fourth bracket. The second photoelectric sensor is used to detect the number of mask products conveyed by the pulley group. When the number of conveyed mask products reaches the set number, the conveyor belt stacked with mask products moves forward, and the downward cylinder ends one stacking operation and starts the next stacking operation.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: with the conveying mechanism, the precise positioning function of conveying can be realized by the servo motor driving the chain to carry the mask carrier, so that the relative positions of the mask body and the ear straps are accurately aligned during welding, greatly increasing the qualification rate in production; in addition, the conveying mechanism is arranged entirely above the equipment platform, avoiding the ultrasonic welding mechanism, and using a shorter chain to make the conveying mechanism, achieving high positioning accuracy, accurate average transmission ratio, stable transmission, high efficiency; large transmission power, strong overload capacity, excellent high-speed performance, and convenient for maintenance and debugging. Brief Description of the Drawings

[0018] Figure 1 is a perspective view of the automatic mask ear strap welder of the present invention;

[0019] Figure 2 is a perspective view of the mask conveying mechanism of the automatic mask ear strap welder of the present invention;

[0020] Figure 3 is a top view of the mask carrier of the automatic mask ear strap welder of the present invention;

[0021] Figure 4 is a top view of the mask carrier of the automatic mask ear strap welder of the present invention carrying a mask;

[0022] Figure 5 is a perspective view of the incoming line mechanism of the automatic mask ear strap welder of the present invention;

[0023] Figure 6 is a perspective view of the welding mechanism of the automatic mask ear strap welder of the present invention;

[0024] Figure 7 is a perspective view of the upper welding die of the automatic mask ear strap welder of the present invention;

[0025] Figure 8 is a bottom view of the upper welding die of the automatic mask ear strap welder of the present invention;

[0026] Figure 9 is a combined perspective view of the incoming line mechanism, wire winding mechanism, wire cutting mechanism, and welding mechanism of the automatic mask ear strap welder of the present invention;

[0027] Figure 10It is a three-dimensional view of the wire winding mechanism of the automatic mask earband welding machine of the present invention;

[0028] Figure 11 It is a side view of the wire winding mechanism of the automatic mask earband welding machine of the present invention;

[0029] Figure 12 It is a three-dimensional view of the wire cutting mechanism of the automatic mask earband welding machine of the present invention;

[0030] Figure 13 It is a three-dimensional view of the palletizing mechanism of the automatic mask earband welding machine of the present invention;

[0031] Figure 14 It is a side view of the palletizing mechanism of the automatic mask earband welding machine of the present invention;

[0032] Figure 15 It is a top view of the palletizing mechanism of the automatic mask earband welding machine of the present invention. Detailed implementation mode

[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings:

[0034] Embodiment

[0035] As Figure 1 shown, an automatic mask earband welding machine of the present invention includes a frame 1. The upper part of the frame is an equipment platform 10. On the equipment platform 10, there are provided a mask conveying mechanism 2, a wire inlet mechanism 3, a wire winding mechanism 4, a wire cutting mechanism 5, a welding mechanism 6, a palletizing mechanism 7 and a controller 8. The wire inlet mechanism 3, the wire winding mechanism 4, the wire cutting mechanism 5 and the welding mechanism 6 are arranged above the mask conveying mechanism 2. The palletizing mechanism 7 is arranged at the output end of the mask conveying mechanism 2. The controller 8 is used to automatically control the operation actions of the above-mentioned various mechanisms, and at the same time, the setting of various action parameters can be carried out. The concept of "wire" in the above-mentioned wire inlet, wire winding and wire cutting all refers to the earband wire, that is, before the earband is cut, it is a very long earband wire.

[0036] As shown in Figure 2- Figure 4As shown in the figure, the mask conveying mechanism 2 includes two sprocket supports 22 oppositely arranged on the equipment platform 10. An active double sprocket 23 and a driven double sprocket 24 are respectively arranged on the two sprocket supports 22. Transmission gears 25 are respectively arranged on both sides of the active double sprocket 23 and the driven double sprocket 24. Two parallel and tensioned chains 26 are connected between the active double sprocket 23 and the driven double sprocket 24. The two chains 26 are respectively meshed with the transmission gears 25 of the active double sprocket 23 and the driven double sprocket 24. All of the two chains 26 are located above the tabletop of the equipment platform 10. A number of flat mask carriers 27 are horizontally and evenly laid on the two chains 26. Both sides of the mask carrier 27 are respectively fixed to the two chains 26. All of the two chains 26 are arranged above the tabletop of the equipment platform 10, instead of in the prior art where the upper half of the chain 26 is arranged on the tabletop of the equipment platform and the lower half of the chain 26 is arranged below the tabletop of the equipment platform. Therefore, the chain conveying structure of the present invention makes the entire chain travel short, the speed fast, the chain has a certain rigidity, the tension of the chain is relatively tight, it is not easy to loosen, and it is easy to realize the precise positioning of the chain for conveying the mask body. The above two chains 6 are all located above the tabletop of the equipment platform 10, that is, the conveying mechanism is in a layout form integrally arranged above the equipment platform 10, avoiding the ultrasonic welding mechanism (not shown in the figure) arranged at the lower part of the frame 1. A conveying mechanism is made with a shorter chain 6 to achieve high positioning accuracy, accurate average transmission ratio, stable transmission, high efficiency; large transmission power, strong overload capacity, excellent high-speed performance, and convenient for maintenance and debugging.

[0037] As Figure 3 , Figure 4 shown in the figure, the mask carrier 27 is used to load the mask body 271 and pause when it is conveyed below the welding mechanism 6 to facilitate welding the ear straps 272 to the mask body 271. The width of the mask carrier 27 is smaller than the width of the mask body 271. When the mask carrier 27 loads the mask body 271, the welding parts 273 of both sides of the mask body 271 and the ear straps 272 are located outside both sides of the mask carrier.

[0038] As Figure 1 , Figure 2 shown in the figure, a sprocket servo motor 28 for driving the active double sprocket 23 to rotate is arranged on one side of the active double sprocket 23. The rotation of the active double sprocket 23 can drive the two chains 26 to rotate synchronously, so that the mask carrier 27 performs cyclic conveying. The sprocket servo motor 28 precisely controls the conveying and positioning of the mask carrier 27 by precisely driving the rotation angle of the active double sprocket 23.

[0039] A first photoelectric sensor 29 is arranged on one side of the two chains 26. The first photoelectric sensor 29 is used to detect the positioning device on the chain 26. When the first photoelectric sensor 29 detects the positioning device, the sprocket servo motor 28 stops rotating to stop and precisely position the mask carrier 27.

[0040] The mask conveying mechanism of the present invention can achieve the precise positioning function of conveying by the way that the servo motor drives the chain to carry the mask carrier, so that the relative positions of the mask body and the ear straps are accurately aligned during welding, and the qualified rate in production is greatly increased.

[0041] As Figure 1 、 Figure 5 shown in the figure, a main bracket 11 is provided above the mask conveying mechanism 2 on the equipment platform 10. An upper platform 110 is provided on the upper part of the main bracket 11. The wire inlet mechanism 3 includes two identical wire inlet modules 3A. The wire inlet modules 3A are respectively arranged on both sides of the upper platform 110. The wire inlet module 3A includes a vertical wire inlet bracket 30. A guide wheel 31 for hanging the ear strap, a wire pulling wheel 32, a pressing wheel 33, an adjusting wheel 34 and a guiding wheel 35 are sequentially arranged on the wire inlet bracket 30. The wire pulling wheel 32 is driven to rotate by a wire pulling motor 36. The pressing wheel 33 presses the ear strap 272 on the wire pulling wheel 32. The adjusting wheel 34 can move up and down along the guide rail 340. The guide wheel 31 guides the ear strap 272 from the outside, and rotates and pulls it downward through the wire pulling wheel 32 and the pressing wheel 33. The adjusting wheel 34 can rely on gravity to tension the ear strap downward. The guiding wheel 35 changes the direction of the ear strap 272 and then guides it downward to the winding mechanism 4. The adjusting wheel 34 can move up and down freely. When the winding mechanism 4 winds the wire quickly, it can pull the adjusting wheel 34 upward. The mask ear strap 272 on the adjusting wheel 34 can be quickly released and supplied to the winding mechanism, avoiding the disadvantage that the wire pulling wheel 32 cannot supply the ear strap in time and quickly. Therefore, the adjusting wheel 34 plays a buffering role.

[0042] As Figure 1 、 Figure 6 shown in the figure, a main bracket 11 is provided above the mask conveying mechanism 2 on the equipment platform 10. An upper platform 110 is provided on the upper part of the main bracket 11. The welding mechanism 6 includes a lower welding die 62 and an upper welding die 63 which are opposite to each other up and down. The lower welding die 62 is provided with two metal-structured blocks, which are respectively fixed on both sides of the mask carrier 7. The upper plane of the lower welding die 62 is flush with the plane of the mask carrier 7, so that both sides of the mask body can be automatically placed on the upper plane of the lower welding die 62. The lower end of the lower welding die 62 is connected to a transducer 61, and the transducer 61 is connected to an ultrasonic generator (not shown in the figure). The transducer 61 and the ultrasonic generator are arranged on the frame 1 under the equipment platform 10.

[0043] There are four identical upper welding dies 63, which are respectively connected to the lower ends of four connecting columns 64 provided on both sides above the mask carrier 7. The four connecting columns 64 are driven by a main cylinder 65 on the upper platform 110 of the main bracket 11 to move up and down. The four connecting columns 64 can synchronously move downward to drive the upper welding die 62 to simultaneously press the welding parts 273 of the mask body 271 and the ear straps 272 on the left and right sides onto the upper plane of the lower welding die 62. The transducer 61 converts electrical energy into ultrasonic vibration energy and transmits it to the lower welding die 62. When the lower welding die 62 and the upper welding die 63 are pressed together, heat is generated due to friction caused by vibration. After a certain period of time, the lower welding die 62 and the upper welding die 63 jointly weld the ends of the ear straps 272 to the mask body 271 together.

[0044] As Figure 3 , Figure 4 , Figure 7 , Figure 8 As shown, the lower plane of the upper welding die 63 is provided with uniformly distributed dot-like protrusions 631. The dot-like protrusions 631 are used to turn the welding surface of the welding part 273 of the mask body 271 and the ear strap 271 into multi-point welding, which can not only achieve firm welding, but also avoid the phenomenon of melting through or fusing due to excessive heat during full-area welding.

[0045] The mask conveying mechanism 2 of the present invention is arranged in a layout form entirely above the equipment platform 10, avoiding the ultrasonic generator and transducer 61 of the welding mechanism provided at the lower part of the frame 1. By using a shorter chain to make the conveying mechanism, it can achieve high positioning accuracy, accurate average transmission ratio, stable transmission, high efficiency; large transmission power, strong overload capacity, excellent high-speed performance, and is convenient for maintenance and debugging.

[0046] As Figure 1 , Figures 9 - 11 As shown, the winding mechanism 4 includes a movable platform 40 and two symmetrically arranged winding discs 41 below the movable platform 40. A rotating shaft 410 is provided in the middle of the winding disc 41. The four connecting columns 64 vertically pass through the movable platform 40. Retaining rings 641 are respectively provided on the four connecting columns 64. Buffer springs 42 are sleeved on the four connecting columns between the retaining rings 641 and the movable platform 40. The two winding discs 41 are respectively driven by winding servo motors 43 to rotate on the horizontal plane. The winding servo motors 43 are fixed on the movable platform 40. A winding action can be completed when the winding disc 41 rotates 180 degrees, and the next winding action can be completed by continuing to rotate 180 degrees.

[0047] When the winding mechanism and the welding mechanism are working, the main cylinder 65 drives the four connecting columns 64 to drive the welding upper mold 63 and the movable platform 40 to move downward at the same time, and the movable platform 40 drives the winding disk 41 downward. The winding disk 41 first touches the mask body when it moves downward, and the ear strap contacts the mask body at this time. Then the four connecting columns 64 compress the buffer spring 42 to continue to move downward, driving the welding upper mold 63 and the welding lower mold 62 to close, ultrasonically welding the welding parts of the ear strap and the mask body, and then resetting. Therefore, the downward movement of the winding mechanism and the welding mechanism is realized by the integrated main cylinder driving the four connecting columns at the same time, and the downward movement of the two mechanisms has some time difference only through the buffer spring 42, which can save time and improve work efficiency.

[0048] Ear strap clips 411 are provided on both sides of the parts of the two winding drums 41 where the ear straps are to be cut, and a pressing block 412 is provided above the ear strap clips 411. The pressing block 412 is driven by a pressing cylinder 413 fixed on the movable platform 40 to move up and down. An inclined surface 4120 is provided at the bottom of the pressing block 412. When the pressing block 412 moves downward, the inclined surface 4120 touches the clamping end (located on the outside) of the ear strap clip 411 to clamp the ear strap; a release block 414 is provided on the other side of the pressing block 412 relative to the rotating shaft of the winding drum 41, and the release block 414 is driven by a release cylinder 415 fixed on the movable platform 40 to move up and down. When the release block 414 moves downward, it touches the release end (located on the inside) of the ear strap clip 411, and at this time, its clamping end (the other end) is opened to loosen the ear strap. There is a rotating shaft between the release end and the clamping end of the ear strap clip 411, so the release end and the clamping end form a lever. When the ear strap clips 411 are in the clamping action, they can clamp the ear strap that has been wound by the winding mechanism 4, so that the wire cutting mechanism 5 can cut the ear strap between the two clamped ear strap clips 411 without causing the ear strap to fall off, and at the same time, the ear strap can be pulled to rotate in the next step.

[0049] like Figure 1 , Figure 5 , Figure 9As shown, the wire cutting mechanism 5 includes scissors 53, a scissors driving motor 52, a scissors driving cylinder 51, and a scissors support 50 provided on the equipment platform 10 and located on both sides of the two chains 26. The scissors driving cylinder 51 is arranged on the scissors support 50 along the direction parallel to the chains 26. The scissors 53 and the scissors driving motor 52 are simultaneously driven by the scissors driving cylinder 51 to move back and forth parallel to the chains 26. One blade of the scissors 53 is fixed, and the other blade is driven by the scissors driving motor 52 to rotate. After the winding mechanism 4 completes one winding action, the scissors 53 extend towards the winding mechanism 4 and cut the earband, and then the scissors 53 reset. When the winding mechanism 4 is working, the two earband clips 411 on one side of the wire cutting mechanism 5 clamp the earband simultaneously. The wire cutting mechanism 5 acts, and the scissors 53 cut the earband between the two earband clips 411. Subsequently, the winding servo motor 43 drives the winding disc 41 to rotate 180 degrees, and the winding disc 41 winds the earband to the outside of the winding disc 41 (towards the outside of the conveyor belt).

[0050] As Figure 1 、 Figures 12 - 14As shown in the figure, the palletizing mechanism 7 includes a first bracket 71 and a second bracket 72 which are arranged relatively parallel. The inner sides of the first bracket 71 and the second bracket 72 facing each other are respectively provided with a horizontally arranged upper pulley group 73 and a lower pulley group 74. Each pulley group includes a belt 730 (740) and two pulleys 731 (741) and 732 (742) connected by the belt. The lower part of the upper belt 730 of the upper pulley group 73 is in contact with the upper part of the lower belt 740 of the lower pulley group 74. The upper belt 730 and the lower belt 740 are in contact with each other and can drive each other by friction. Two opposite pulleys 731 in the upper pulley group 73 or the lower pulley group 74 of the first bracket 71 and the second bracket 72 are arranged on the same drive shaft 733. Driven by the palletizing motor 75, the drive shaft 733 drives the upper pulley group 73 to rotate. The belt 730 of the upper pulley group 73 drives the lower pulley group 74 by friction through contact with the belt 740 of the lower pulley group 74, so that the belts of all pulley groups can be driven to rotate synchronously in opposite directions. The two sides of the mask finished product (not shown in the figure) with the ear straps welded are respectively fed into the contact part of the upper belt 730 and the lower belt 740 and are clamped and conveyed forward by the upper belt 730 and the lower belt 740 (as shown by the arrows in the figure). On the inner sides of the first bracket 71 and the second bracket 72, two relatively protruding supporting platforms 711 and 721 are respectively arranged in front of the upper and lower pulley groups 73 and 74. The two supporting platforms 711 and 721 are used to support the mask finished products conveyed by the pulley groups on the left and right sides. A third bracket 76 is bridged above the supporting platforms 711 and 721 of the first bracket 71 and the second bracket 72. A pressing cylinder 761 is arranged on the third bracket 76. A pressing plate 762 is arranged below the third bracket 76 and in the middle of the two supporting platforms 711 and 721. The pressing cylinder 761 drives the pressing plate 762 to move up and down to press and palletize the mask finished products supported by the supporting platforms 711 and 721 in sequence. A guide rod 763 passing through the third bracket 76 is arranged on the pressing plate 762. The guide rod 763 is used for up and down guiding, that is, to limit the pressing plate 762 to move only up and down.

[0051] A fourth bracket 77 is arranged on the first bracket 71 (or the second bracket 72). A second photoelectric sensor 771 is arranged above the upper and lower pulley groups 73 and 74 on the fourth bracket 77. The second photoelectric sensor 771 is used to detect the number of mask finished products conveyed by the pulley group. When the number of conveyed mask finished products reaches the set number, the conveyor belt (not shown in the figure) on which the mask finished products are palletized moves forward, the pressing cylinder 761 ends one palletizing and starts the next palletizing. The palletized mask finished products are stacked on the conveyor belt of the separately arranged mask finished products and move forward in sequence for further packaging.

[0052] The palletizing motor 75 is a speed-regulating motor, and the speed of conveying the mask finished products by the upper pulley group 73 and the lower pulley group 74 is adjusted by regulating the speed of the speed-regulating motor.

[0053] The palletizing mechanism 7 can neatly and automatically stack the finished mask products with the earbands welded in a certain quantity. The stacked finished mask products are conveyed in sequence on the separately provided conveyor belt for the finished mask products, so as to directly carry out packaging in the next step. This saves a large amount of manpower for sorting and palletizing, and greatly improves the automatic production efficiency of the masks.

[0054] The above are only the preferred embodiments of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention shall fall within the scope covered by the claims of the present invention.

Claims

1. An automatic mask earband welding machine, comprising a frame, and the upper surface of the frame is an equipment platform, characterized in that, The equipment platform is provided with a mask conveying mechanism, a wire inlet mechanism, a wire winding mechanism, a wire cutting mechanism, a welding mechanism, a palletizing mechanism and a controller. The wire inlet mechanism, the wire winding mechanism, the wire cutting mechanism and the welding mechanism are arranged above the mask conveying mechanism. The palletizing mechanism is arranged at the output end of the mask conveying mechanism. The mask conveying mechanism includes two sprocket supports oppositely arranged on the equipment platform. An active double sprocket and a driven double sprocket are respectively arranged on the two sprocket supports. Transmission gears are respectively arranged on both sides of the active double sprocket and the driven double sprocket. Two parallel and tensioned chains are arranged between the active double sprocket and the driven double sprocket. The two chains are respectively meshed with the transmission gears of the active double sprocket and the driven double sprocket. The two chains are all located above the tabletop of the equipment platform. A plurality of flat mask carriers are horizontally and evenly laid on the two chains. Both sides of the mask carrier are respectively fixed on the two chains. The mask carrier is used for loading the mask body and pausing when it is conveyed below the welding mechanism to facilitate the welding of the ear straps to the mask body. The width of the mask carrier is smaller than that of the mask body. When the mask carrier loads the mask body, the welding parts of the ear straps and the mask body are located outside both sides of the mask carrier. One side of the active double sprocket is provided with a sprocket servo motor for driving the active double sprocket to rotate. The rotation of the active double sprocket can drive the two chains to rotate synchronously so that the mask carrier performs cyclic conveying. The sprocket servo motor precisely controls the conveying and positioning of the mask carrier by precisely driving the rotation angle of the active double sprocket; A main support is arranged above the two chains on the equipment platform. An upper platform is arranged on the upper part of the main support. The welding mechanism includes a lower welding die and an upper welding die which are opposite to each other up and down. The lower welding die is fixedly arranged on both sides of the mask carrier. The upper plane of the lower welding die is flush with the plane of the mask carrier. The lower end of the lower welding die is connected with a transducer. The transducer is connected with an ultrasonic generator. The transducer and the ultrasonic generator are arranged on the frame below the equipment platform. There are four identical upper welding dies, which are respectively connected to the lower ends of four connecting columns arranged above both sides of the mask carrier. The four connecting columns are driven by a main cylinder arranged on the upper platform to move up and down. The four connecting columns can synchronously move downward to drive the upper welding die to press the welding parts of the mask body and the ear straps downward to contact the upper plane of the lower welding die at the same time. The transducer converts electrical energy into ultrasonic vibration energy and transmits it to the lower welding die. When the lower welding die and the upper welding die are pressed together, heat energy is generated due to friction caused by vibration. After a certain period of time, the lower welding die and the upper welding die jointly weld the ends of the ear straps to the mask body; The palletizing mechanism includes a first bracket and a second bracket which are arranged relatively parallel. Horizontally arranged upper pulley groups and lower pulley groups are respectively provided on the opposite inner sides of the first bracket and the second bracket. Each pulley group includes a belt and two pulleys connected by the belt. The lower part of the upper belt of the upper pulley group and the upper part of the lower belt of the lower pulley group are in contact with each other. Two opposite pulleys on the first bracket and the second bracket are arranged on the same drive shaft. The drive shaft drives the belts of all pulley groups to rotate synchronously under the drive of a palletizing motor. The two sides of the mask finished products with ear straps welded are respectively fed into the contact part of the upper belt and the lower belt and are clamped and conveyed forward by the upper and lower belts. On the inner sides of the first bracket and the second bracket, two relatively protruding supporting platforms are respectively provided in front of the upper and lower pulley groups. The two supporting platforms are used to support the mask finished products conveyed by the upper and lower pulley groups on the left and right sides. A third bracket is bridged above the supporting platforms on the first bracket and the second bracket. A pressing cylinder is provided on the third bracket. A pressing plate is provided below the third bracket and in the middle of the two supporting platforms. The pressing cylinder drives the pressing plate to move up and down to press and palletize the mask finished products supported by the platforms in sequence.

2. The automatic mask earloop welding machine according to claim 1, characterized in that, A first photoelectric sensor is provided on one side of the two chains. The first photoelectric sensor is used to detect the positioning device provided on the chain. When the first photoelectric sensor detects the positioning device, the sprocket servo motor immediately stops rotating to accurately position the mask carrier.

3. The automatic mask earloop welding machine according to claim 1, wherein, A main bracket is provided above the two chains on the equipment platform. An upper platform is provided on the upper part of the main bracket. The wire feeding mechanism includes two identical wire feeding modules. The wire feeding modules are respectively arranged on both sides of the upper platform. The wire feeding module includes a vertical wire feeding bracket. A guiding wheel for hanging the ear strap, a wire pulling wheel, a pressing wheel, an adjusting wheel and a guiding-out wheel are sequentially provided on the wire feeding bracket. The wire pulling wheel is driven to rotate by a wire pulling motor. The pressing wheel presses the ear strap on the wire pulling wheel. The adjusting wheel can move up and down along the guide rail. The guiding wheel guides the ear strap in from the outside, pulls it downward through the wire pulling wheel and the pressing wheel. The adjusting wheel can tension the ear strap downward by gravity. The guiding-out wheel changes the direction of the ear strap and then guides it downward to the wire winding mechanism.

4. The automatic mask earloop welding machine according to claim 1, wherein Several uniformly distributed dot-shaped protrusions are provided on the lower plane of the upper welding die. The dot-shaped protrusions are used to change the full-plane welding of the ear strap and the welding part of the mask body into multi-point welding.

5. The automatic mask earloop welding machine according to claim 1, wherein The wire winding mechanism includes a movable platform and two symmetrically arranged wire winding discs on the left and right below the movable platform. The four connecting columns are vertically sleeved in the movable platform. Retaining rings are respectively provided on the upper parts of the four connecting columns. Buffer springs are sleeved on the four connecting columns between the retaining rings and the movable platform. The two wire winding discs are respectively driven by wire winding servo motors to rotate on the horizontal plane. The wire winding servo motors are fixed on the movable platform. The wire winding disc can complete one wire winding action by rotating 180 degrees, and can complete the next wire winding action by continuing to rotate 180 degrees.

6. The automatic mask earloop welding machine according to claim 5, wherein On both sides of the parts of the two winding reels where the ear straps are to be cut, there are also ear strap clips respectively. Above the ear strap clips, there is a pressing block, which is driven by a pressing air cylinder fixed on the movable platform to move up and down. The bottom of the pressing block is provided with an inclined surface. When the pressing block moves downward, the inclined surface touches the clamping end of the ear strap clip to clamp the ear strap. On the other side of the pressing block relative to the winding reel rotating shaft, there is a releasing block, which is driven by a releasing air cylinder fixed on the movable platform to move up and down. When the releasing block moves downward, it touches the releasing end of the ear strap clip to release the ear strap.

7. The automatic mask earloop welding machine according to claim 1, wherein The wire cutting mechanism includes scissors, a wire cutting drive motor, a wire cutting drive air cylinder and a scissors support. The scissors support is arranged on the equipment platform and on both sides of the two chains. The wire cutting drive air cylinder is arranged on the scissors support along the direction parallel to the chains. The scissors and the wire cutting drive motor are simultaneously driven by the wire cutting drive air cylinder to move back and forth. One blade of the scissors is fixed, and the other blade is driven by the wire cutting drive motor to rotate. After the winding mechanism completes one winding action, the scissors extend towards the winding mechanism to cut the ear strap and then reset.

8. The automatic mask earloop welding machine according to claim 1, wherein A fourth support is provided on the first support or the second support. Above the pulley group on the fourth support, there is a second photoelectric sensor, which is used to detect the quantity of the finished masks conveyed by the pulley group. When the conveyed finished masks reach the set quantity, the conveyor belt stacked with the finished masks moves forward, and the pressing air cylinder ends one stacking and starts the next stacking.

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