A multi-station bilateral welding device and method for mask ear ropes

Abstract

The present invention discloses a multi-station double-sided welding device and method for mask ear ropes. The device includes a mask body conveyor belt, an ear rope cutting and pulling-out mechanism, an ear rope rotating and clamping mechanism, and an ear rope welding mechanism. The mask body conveyor belt is arranged in the middle of the device, and the ear rope welding mechanisms are arranged on the upper and lower sides of the mask body conveyor belt. At least one pair of ear rope cutting and pulling-out mechanisms and at least one pair of ear rope rotating and clamping mechanisms are symmetrically arranged on the left and right sides of the mask body conveyor belt, and the ear rope cutting and pulling-out mechanisms are located below the ear rope rotating and clamping mechanisms. The method is that on both sides of the mask body conveyor belt, at each mask processing station, the actions of pulling out, clamping, cutting, moving, and welding the ear ropes are simultaneously carried out through the ear rope cutting and pulling-out mechanism, the ear rope rotating and clamping mechanism, and the ear rope welding mechanism. The device of the present invention has a compact structure, can realize the simultaneous processing of double-sided mask ear ropes at multiple stations, and effectively improves the production efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of mask processing, and particularly relates to a multi-station double-sided welding device and method for mask ear ropes. Background Art

[0002] In mask production (especially the production of N95 masks), the unwinding, cutting, and clamping of ear ropes are the most complex processes. Therefore, mask ear rope welding is also a key process affecting the mask production speed. Currently, for mask ear rope welding, the mainstream processing method is: each time, one ear rope is clamped and cut, then U-shaped bending and positioning are performed, and then welding is carried out. After the welding is completed, the mechanism performs actions such as clamping, cutting, and welding of the next ear rope. That is, in this process, an ear rope pulling mechanism is usually provided in the ear rope unwinding mechanism to pull the ear rope from the material pile or material roll of the raw material according to a set length, clamp both ends of the ear rope, cut it according to the set length, and then bend both ends of the ear rope to the positions on the mask body where welding is required through a U-shaped bending mechanism. After the unwinding and positioning of the ear rope are completed, it passes through the electric welding mechanism to complete the welding of the ear rope; after all the above actions are completed, the clamping, cutting, and welding of the next ear rope can be carried out. Due to the large number of components and the large size of the mechanism of this equipment, it is impossible to arrange a set of symmetric equipment on both sides of the same mask for simultaneous processing. If the ear ropes of multiple masks need to be welded simultaneously, the equipment corresponding to this process will be very large, and the installation space required will also be very large. This will lead to a large number of spare parts and a large number of action cylinders, and it is extremely easy to have failures, the number of failure points increases significantly, and downtime often occurs. Therefore, it cannot effectively improve production efficiency. Thus, it can be seen that on the basis of the existing equipment, simply relying on the form of increasing workstations obviously cannot improve production efficiency. Therefore, in current production practices, as Figure 1 shown, the two ear ropes 22 on the left and right sides of the same mask body 21 are still processed by the method of welding one after another. In this case, the processing speed is slow and it is difficult to meet the market demand. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a multi-station double-sided welding device for mask ear ropes. The device has a compact structure and can realize the simultaneous processing of double-sided mask ear ropes at multiple workstations, effectively improving production efficiency.

[0004] Another purpose of the present invention is to provide a multi-station double-sided welding method for mask ear ropes realized by the above device.

[0005] The technical solution of the present invention is as follows: A multi-station double-sided welding device for mask ear ropes, including a mask body conveyor belt, an ear rope cutting and pulling-out mechanism, an ear rope rotating and clamping mechanism, and an ear rope welding mechanism. The mask body conveyor belt is arranged in the middle of the device, and the ear rope welding mechanism is arranged on the upper and lower sides of the mask body conveyor belt. At least one pair of ear rope cutting and pulling-out mechanisms and at least one pair of ear rope rotating and clamping mechanisms are symmetrically arranged on the left and right sides of the mask body conveyor belt, and the ear rope cutting and pulling-out mechanism is located below the ear rope rotating and clamping mechanism.

[0006] The ear rope cutting and pulling-out mechanism includes a pulling-out driving component, a fixed clamping component, a moving clamping component, a cutting component, a mounting bracket, and a guide rail. The guide rail is arranged on the mounting bracket. The fixed clamping component and the cutting component are arranged at one end of the guide rail, and the cutting component is located inside the fixed clamping component. The moving clamping component is arranged on the guide rail and moves along the guide rail. The pulling-out driving component is arranged on one side of the guide rail and is connected to the moving clamping component.

[0007] On the same side of the mask body conveyor belt, when there are multiple ear rope cutting and pulling-out mechanisms, the fixed clamping component, the moving clamping component, the cutting component, the mounting bracket, and the guide rail in each ear rope cutting and pulling-out mechanism form a cutting and pulling-out unit. Multiple cutting and pulling-out units share one pulling-out driving component. The moving clamping components in each cutting and pulling-out unit are fixedly connected, and the outermost moving clamping component is connected to the pulling-out driving component. A lifting mounting plate is also arranged at the bottom of each ear rope cutting and pulling-out mechanism. Among them, each cutting and pulling-out unit corresponds to a roll of ear rope coil. The fixed clamping component is mainly used to fix the end of the roll of ear rope coil and assist other components to fix the ear rope when necessary to avoid falling off. The corresponding length of the ear rope can be pulled out from the roll of ear rope coil by the movement of the moving clamping component along the guide rail. After the ear rope rotating and clamping mechanism below clamps the pulled-out ear rope, the ear rope is cut from the coil by the cutting component. Therefore, according to the actual needs of the number of mask processing stations in the mask production process, each cutting and pulling-out unit is equipped with a corresponding ear rope coil, and the number can be adjusted according to actual needs, and the application is relatively flexible. The lifting mounting plate can drive each ear rope cutting and pulling-out mechanism to perform lifting movement, rise to a suitable height when it is necessary to cooperate with the ear rope rotating and clamping mechanism to clamp the ear rope, and descend a certain height when it is not necessary to cooperate with the ear rope rotating and clamping mechanism to avoid interference with the ear rope rotating and clamping mechanism or other mechanisms.

[0008] The fixed clamping component includes a fixed clamping cylinder and a fixed claw, and the fixed claw is arranged at the end of the fixed clamping cylinder. Among them, the fixed clamping cylinder is an opening and closing cylinder, which drives the fixed claw to perform opening and closing actions to clamp or release the ear rope.

[0009] The cutting component includes a spacer block, a cutter, a cutter cylinder, and a support frame. The spacer block is arranged opposite to the cutter, and an earstring channel is formed between the spacer block and the cutter. The cutter is arranged at the end of the cutter cylinder, the cutter cylinder is installed on one side of the support frame, and the fixed clamping cylinder is installed on the other side of the support frame. Among them, the cutter cylinder is a telescopic cylinder. After the earstring is clamped by the following earstring rotary clamping mechanism, the cutter is driven by the cutter cylinder to approach the spacer block to cut the earstring, thereby realizing the splitting action of the earstring.

[0010] The moving clamping component includes a moving clamping cylinder, moving jaws, a slider, and a fixed support block. The moving jaws are arranged at the end of the moving clamping cylinder, the moving clamping cylinder is installed on the fixed support block, the slider is installed at the bottom of the fixed support block, and the slider is matched with the guide rail. When there are multiple cutting and pulling units, the fixed support blocks between adjacent two moving clamping components are fixedly connected, and the fixed support block at the outermost side is connected to the driving component. Among them, the moving clamping cylinder is also an opening and closing cylinder, which drives the moving jaws to perform opening and closing actions to clamp or release the earstring.

[0011] The pulling driving component includes a conveyor belt and conveyor belt wheels that are matched with each other. The fixed support block is fixedly installed on the conveyor belt, and the conveyor belt wheels are externally connected to a power driving device. In this structure, by the back-and-forth movement of the conveyor belt, each moving clamping component can be driven by the fixed support block to move back and forth along its respective guide rail. When the moving clamping component clamps the earstring near the fixed clamping component and then retreats to the other end of the guide rail along the guide rail, the pulling of the earstring with a set length can be realized.

[0012] In the earstring cutting and pulling mechanism, the guide rail is inclined with respect to the conveying direction of the mask body conveyor belt. That is, in this structure, each earstring cutting and pulling mechanism is inclined with respect to the mask body conveyor belt. The specific inclination angle can be selected and adjusted according to the actual installation situation of the equipment and the welding angle of the earstrings on the mask body. However, since each earstring cutting and pulling mechanism is inclined, the following earstring rotary clamping mechanism is also inclined, which can make the installation and arrangement of each mechanism more compact and effectively reduce the floor area of the equipment.

[0013] At the earstring rotary clamping mechanism, an installation frame and a moving installation plate are also provided in the welding equipment. The moving installation plate is slidably connected to the installation frame, and the earstring rotary clamping mechanism is installed between the moving installation plate and the installation frame.

[0014] The earstring rotating clamping mechanism includes a connecting rod assembly, a first transmission gear, a second transmission gear, a first gear shaft, a second gear shaft and a gripper assembly. The first transmission gear and the second transmission gear are meshed and connected. A first gear shaft is arranged in the middle of the first transmission gear, and a second gear shaft is arranged in the middle of the second transmission gear. The outer peripheries of the first gear shaft and the second gear shaft are both installed on the moving mounting plate through bearings. At the lower ends of the first gear shaft and the second gear shaft, gripper assemblies with symmetrical structures are respectively provided. The two ends of the connecting rod assembly are respectively connected to the mounting frame and the upper end of the first gear shaft. The connecting rod assembly includes two articulated connecting rods. When the moving mounting plate slides relative to the mounting frame, due to the change in distance, the two connecting rods in the connecting rod assembly will swing. This swing will drive the first gear shaft connected to it to rotate. At the same time, under the meshing action of the first transmission gear and the second transmission gear, the second gear shaft will rotate in the opposite direction synchronously with the first gear shaft. Therefore, the gripper assemblies at the lower ends of the first gear shaft and the second gear shaft will also swing accordingly. When the two gripper assemblies swing to form a straight line, the earstring is clamped from the earstring cutting and pulling mechanism in this state. When the two gripper assemblies swing to form a parallel shape or have a certain included angle, the earstring welder is fixed to the mask body in this state in cooperation with the earstring welding mechanism. According to the actual requirements of the number of mask processing stations in the mask production process, the number of earstring rotating clamping mechanisms on the same outer side of the mask body conveyor belt is the same as the number of stations. Each earstring rotating clamping mechanism is parallelly installed between the moving mounting plate and the mounting frame.

[0015] In the earstring rotating clamping mechanism, the gripper assembly includes a pair of pneumatic grippers, a movable inclined block, an inclined block ejector rod, a gripper spring and an auxiliary fixing block. Auxiliary fixing blocks are arranged on the outer sides of the pneumatic grippers, and the outer sides of the pneumatic grippers are connected to the auxiliary fixing blocks through gripper springs. The movable inclined block is arranged between the two pneumatic grippers, and an inclined block ejector rod is connected to one side of the movable inclined block.

[0016] The two pneumatic grippers are symmetrically installed. The cross-section of the movable inclined block is in an inverted triangular shape. The lower end of the movable inclined block is inserted between the two pneumatic grippers, and the two pneumatic grippers are opened and closed by squeezing the pneumatic grippers and the gripper springs through the inclined surfaces on both sides.

[0017] When the gripper assembly is in use, a ejector rod spring (used as a return spring) can also be arranged at the bottom of the inclined block ejector rod. An outer cover is arranged on the outer periphery of the inclined block ejector rod and is correspondingly connected to the lower end of the first gear shaft or the second gear shaft. The upper end of the inclined block ejector rod is externally connected to a pneumatic device. When the inclined block ejector rod drives the movable inclined block to move upward, under the action of the gripper springs on the outer sides of the two pneumatic grippers, the upper parts of the two pneumatic grippers approach each other respectively, so that the lower parts and the clamping ends are in an open state. When the inclined block ejector rod drives the movable inclined block to move downward, the upper parts of the two pneumatic grippers are squeezed by the movable inclined block. At this time, the gripper springs contract, and the lower parts and the clamping ends of the pneumatic grippers are closed, and the earstring can be clamped.

[0018] The earstring welding mechanism includes an ultrasonic head, a pressing needle, a pressing needle cylinder, and a connecting frame. The ultrasonic head and the pressing needle are relatively arranged on the upper and lower sides of the mask body conveyor belt. There are two pressing needles, and the two pressing needles are arranged on the connecting frame. The pressing needle cylinder is installed on the top of the connecting frame. After the earstring rotating clamping mechanism sends the earstring to the preset position of the mask body, the pressing needle cylinder drives the connecting frame to drive the two pressing needles to press down simultaneously. Under the ultrasonic action of the ultrasonic head, both ends of the earstring are welded and fixed to the mask body. According to the actual requirements of the number of mask processing stations in the mask production process, on the same outer side of the mask body conveyor belt, the number of earstring welding mechanisms is the same as the number of stations, and the earstring welding mechanisms on both sides of the mask body are symmetrically installed.

[0019] In the above device structure, the mask body conveyor belt can be the same as that in the traditional device.

[0020] The present invention realizes a multi-station double-sided welding method for mask earstrings through the above device, including the following steps:

[0021] (1) The formed mask body is continuously conveyed by the mask body conveyor belt, and the external unwinding mechanism continuously unwinds the earstrings.

[0022] (2) On both sides of the mask body conveyor belt, the earstring cutting and pulling-out mechanisms at each mask processing station pull out the earstrings according to the preset length.

[0023] (3) On both sides of the mask body conveyor belt, the earstring rotating clamping mechanisms at each mask processing station clamp the earstrings from the earstring cutting and pulling-out mechanisms. The earstring cutting and pulling-out structure cuts the earstrings, and the part clamped by the earstring rotating clamping mechanism forms a single independent earstring.

[0024] (4) The earstring rotating clamping mechanism sends the earstring to the corresponding position of the mask body on the mask body conveyor belt, and the earstring welding mechanism welds and fixes the earstrings on both sides of the mask body to the mask body simultaneously.

[0025] When the above multi-station double-sided welding device and method for mask earstrings are used, the principle is as follows: By respectively arranging symmetrically structured earstring cutting and pulling-out mechanisms, earstring rotating clamping mechanisms, and earstring welding mechanisms on both sides of the mask body conveyor belt, the earstrings can be welded on both sides of the mask body simultaneously during mask processing, realizing double-sided welding; and on the same side of the mask body conveyor belt, multiple groups of earstring cutting and pulling-out mechanisms, earstring rotating clamping mechanisms, and earstring welding mechanisms are distributed from bottom to top, and each group corresponds to a mask processing station. Therefore, multi-station simultaneous welding can also be achieved; thus, the problem of low welding speed of traditional devices is solved, and a certain number of stations can be expanded according to actual production needs. In addition, through the reasonable distribution and structural design of each functional mechanism, the use of action cylinders can be greatly reduced, and the operation stability of the device can be improved.

[0026] The present invention has the following beneficial effects compared with the prior art:

[0027] After the multi-station double-side welding equipment and method for mask ear ropes are applied to the mask production line, the double-side ear ropes of each mask on multiple stations can be processed simultaneously, solving the problem of low welding speed of traditional equipment, effectively improving the production efficiency to meet the market demand.

[0028] In the multi-station double-side welding equipment for mask ear ropes, the ear rope cutting and pulling-out mechanism, the ear rope rotating and clamping mechanism, and the ear rope welding mechanism are correspondingly distributed on both sides of the mask body conveyor belt according to the number of mask processing stations, and the number of stations can be expanded or reduced according to the actual needs of the mask production line, and the adjustment method is simple and convenient; at the same time, the center lines of each mechanism are inclined at a certain angle with respect to the mask body conveyor belt, so multiple groups of ear rope cutting and pulling-out mechanisms, ear rope rotating and clamping mechanisms, and ear rope welding mechanisms can be arranged within a relatively small range. Compared with the structure of traditional equipment, the structure of this equipment is more compact, occupies less floor space, and the equipment cost is also lower.

[0029] In the multi-station double-side welding equipment for mask ear ropes, on the same side of the mask body conveyor belt, each ear rope cutting and pulling-out mechanism is driven in linkage by the same set of driving mechanisms, and each ear rope rotating and clamping mechanism is also driven in linkage by the same set of driving mechanisms, which can effectively reduce the use of a large number of action cylinders and improve the stability and reliability of the equipment operation. Brief Description of the Drawings

[0030] Figure 1 It is a schematic principle diagram of the sequential welding of the ear ropes on both sides of the existing mask body.

[0031] Figure 2 It is a schematic diagram of the overall structure of the multi-station double-side welding equipment for mask ear ropes of the present invention.

[0032] Figure 3 It is Figure 2 a top view of the welding equipment shown.

[0033] Figure 4 It is a schematic diagram of the structure of the ear rope cutting and pulling-out mechanism located on one side of the mask body conveyor belt.

[0034] Figure 5 It is Figure 4 a top view of the ear rope cutting and pulling-out mechanism shown.

[0035] Figure 6 It is Figure 4 a schematic diagram of the structure of a single cutting component in

[0036] Figure 7Schematic diagram of the state change of the earloop rotating clamping mechanism from clamping the earloop from the earloop cutting and pulling-out mechanism to sending the earloop to the mask body.

[0037] Figure 8 It is Figure 7 Top view of the structural change shown.

[0038] Figure 9 It is Figure 7 Bottom view of the structural change shown.

[0039] Figure 10 It is Figure 7 Schematic diagram of the state change when the earloop changes from a straight shape to a bent shape on the mask body during the structural change shown.

[0040] Figure 11 Schematic diagram of the structure of a single earloop rotating clamping mechanism.

[0041] Figure 12 It is Figure 11 Top view.

[0042] Figure 13-1 Schematic diagram of the structure when a single air gripper assembly is in the clamping state.

[0043] Figure 13-2 It is Figure 13-1 A-A sectional view.

[0044] Figure 13-3 Schematic diagram of the structure when a single air gripper assembly is in the open state.

[0045] Figure 13-4 It is Figure 13-3 B-B sectional view.

[0046] Figure 14 Schematic diagram of the principle of a single earloop rotating clamping mechanism for clamping the earloop from the earloop cutting and pulling-out mechanism.

[0047] Figure 15 Schematic diagram of the structure of a single earloop welding mechanism.

[0048] Figure 16 Schematic diagram of the states of each mechanism during earloop welding.

[0049] In the above figures, the components indicated by each reference numeral are as follows: a is the conveyor belt for the mask body, b is the earloop cutting and pulling-out mechanism, c is the earloop rotating and clamping mechanism, and d is the earloop welding mechanism; 1 is the pulling drive assembly, 1-1 is the conveyor belt, 1-2 is the conveyor belt pulley, 2 is the fixed clamping assembly, 2-1 is the fixed clamping cylinder, 2-2 is the fixed jaw, 3 is the moving clamping assembly, 3-1 is the moving clamping cylinder, 3-2 is the moving jaw, 3-3 is the slider, 3-4 is the fixed support block, 4 is the cutting assembly, 4-1 is the spacer block, 4-2 is the cutter, 4-3 is the cutter cylinder, 4-4 is the support frame, 5 is the mounting bracket, 6 is the guide rail, 7 is the lifting mounting plate, 8 is the lifting cylinder, 9 is the mounting frame, 10 is the moving mounting plate, 11 is the connecting rod assembly, 12 is the first transmission gear, 13 is the second transmission gear, 14 is the first gear shaft, 15 is the second gear shaft, 16 is the gripper assembly, 16-1 is the pneumatic gripper, 16-2 is the movable inclined block, 16-3 is the inclined block ejector rod, 16-4 is the gripper spring, 16-5 is the auxiliary fixing block, 17 is the ultrasonic head, 18 is the pressing pin, 19 is the pressing pin cylinder, 20 is the connecting frame, 21 is the mask body, and 22 is the earloop. Specific Embodiment

[0050] The present invention will be further described in detail below in conjunction with embodiments, but the embodiments of the present invention are not limited thereto.

[0051] Embodiment

[0052] In this embodiment, a multi-station double-sided welding device for mask earloops is as Figure 2 or Figure 3 shown, and includes a conveyor belt a for the mask body, an earloop cutting and pulling-out mechanism b, an earloop rotating and clamping mechanism c, and an earloop welding mechanism d. The conveyor belt for the mask body is arranged in the middle of the device, and the earloop welding mechanism is arranged on the upper and lower sides of the conveyor belt for the mask body. At least one pair of earloop cutting and pulling-out mechanisms and at least one pair of earloop rotating and clamping mechanisms are symmetrically arranged on the left and right sides of the conveyor belt for the mask body, and the earloop cutting and pulling-out mechanism is located below the earloop rotating and clamping mechanism. The specific structures of each component mechanism are as follows:

[0053] On the same side of the conveyor belt for the mask body, there are five earloop cutting and pulling-out mechanisms in this embodiment, as Figure 4 or Figure 5As shown in the figure, the earstring cutting and pulling-out mechanism includes a pulling-out drive assembly 1, a fixed clamping assembly 2, a movable clamping assembly 3, a cutting assembly 4, a mounting bracket 5 and a guide rail 6. The guide rail is arranged on the mounting bracket. The fixed clamping assembly and the cutting assembly are arranged at one end of the guide rail. The cutting assembly is located inside the fixed clamping assembly. The movable clamping assembly is arranged on the guide rail and moves along the guide rail. The pulling-out drive assembly is arranged on one side of the guide rail and is connected to the movable clamping assembly. The fixed clamping assembly, the movable clamping assembly, the cutting assembly, the mounting bracket and the guide rail in each earstring cutting and pulling-out mechanism form a cutting and pulling-out unit. A plurality of cutting and pulling-out units share one pulling-out drive assembly. The movable clamping assemblies in each cutting and pulling-out unit are fixedly connected. The movable clamping assembly located on the outermost side is connected to the pulling-out drive assembly. A lifting mounting plate 7 is further arranged at the bottom of each earstring cutting and pulling-out mechanism. Among them, each cutting and pulling-out unit corresponds to a roll of earstring coil material. The fixed clamping assembly is mainly used to fix the end of the roll of earstring coil material and assist other components to fix the earstring when necessary to avoid falling off. By moving the movable clamping assembly along the guide rail, a corresponding length of earstring can be pulled out from the roll of earstring coil material. After the following earstring rotating clamping mechanism clamps the pulled-out earstring, the earstring is cut off from the coil material by the cutting assembly. Therefore, according to the actual requirements of the number of mask processing stations in the mask production process, each cutting and pulling-out unit is equipped with a corresponding earstring coil material, and the number can be adjusted according to actual needs, and the application is relatively flexible. The lifting mounting plate can drive each earstring cutting and pulling-out mechanism to perform lifting movement by using a lifting cylinder 8 (as shown in Figure 14 ). When it is necessary to cooperate with the earstring rotating clamping mechanism to clamp the earstring, it rises to a suitable height. When it is not necessary to cooperate with the earstring rotating clamping mechanism, it descends a certain height to avoid interference with the earstring rotating clamping mechanism or other mechanisms.

[0054] Among them, the fixed clamping assembly includes a fixed clamping cylinder 2-1 and a fixed claw 2-2. The fixed claw is arranged at the end of the fixed clamping cylinder. Among them, the fixed clamping cylinder is an opening and closing cylinder, which drives the fixed claw to perform opening and closing actions to clamp or release the earstring. As shown in Figure 6As shown in the figure, the cutting assembly includes a cushion block 4-1, a cutter 4-2, a cutter cylinder 4-3 and a support frame 4-4. The cushion block is arranged opposite to the cutter, and an ear string channel is formed between the cushion block and the cutter. The cutter is arranged at the end of the cutter cylinder, the cutter cylinder is installed on one side of the support frame, and the fixed clamping cylinder is installed on the other side of the support frame. Among them, the cutter cylinder is a telescopic cylinder. After the ear string is clamped by the following ear string rotary clamping mechanism, the cutter is driven by the cutter cylinder to approach the cushion block to cut the ear string, so as to realize the splitting action of the ear string. The moving clamping assembly includes a moving clamping cylinder 3-1, a moving claw 3-2, a slider 3-3 and a fixed support block 3-4. The moving claw is arranged at the end of the moving clamping cylinder. The moving clamping cylinder is installed on the fixed support block, and the slider is installed at the bottom of the fixed support block. The slider is matched with the guide rail. When there are multiple cutting and pulling-out units, the fixed support blocks between adjacent two moving clamping assemblies are fixedly connected, and the outermost fixed support block is connected with the driving assembly. Among them, the moving clamping cylinder is also an opening and closing cylinder, which drives the moving claw to perform opening and closing actions to clamp or relax the ear string. The pulling and driving assembly includes a conveyor belt 1-1 and a conveyor belt wheel 1-2 which are matched with each other. The fixed support block is fixedly installed on the conveyor belt, and the conveyor belt wheel is externally connected with a power driving device. In this structure, by using the back-and-forth movement of the conveyor belt, each moving clamping assembly can be driven by the fixed support block to move back and forth along its respective guide rail. When the moving clamping assembly clamps the ear string near the fixed clamping assembly and then the moving clamping assembly retreats along the guide rail to the other end of the guide rail, the pulling out of the ear string with a set length can be realized.

[0055] In the ear string cutting and pulling-out mechanism, the guide rail is inclined relative to the conveying direction of the mask body conveyor belt. That is, in this structure, each ear string cutting and pulling-out mechanism is inclined relative to the mask body conveyor belt. The specific inclination angle can be selected and adjusted according to the actual installation situation of the equipment and the welding angle of the ear strings on the mask body. However, since each ear string cutting and pulling-out mechanism is inclined, the following ear string rotary clamping mechanism is also inclined, which can make the installation layout of each mechanism more compact and effectively reduce the floor area of the equipment.

[0056] As Figures 7 to 9 shown in the figure, at the ear string rotary clamping mechanism, an installation frame 9 and a moving installation plate 10 are also provided in the welding equipment. The moving installation plate is slidably connected with the installation frame, and the ear string rotary clamping mechanism is installed between the moving installation plate and the installation frame.

[0057] The ear string rotary clamping mechanism includes a connecting rod assembly 11, a first transmission gear 12, a second transmission gear 13, a first gear shaft 14, a second gear shaft 15 (as Figure 11 or Figure 12As shown, there is a gripper assembly 16. The first transmission gear and the second transmission gear are meshed and connected. A first gear shaft is arranged in the middle of the first transmission gear, and a second gear shaft is arranged in the middle of the second transmission gear. The outer peripheries of the first gear shaft and the second gear shaft are both installed on the moving mounting plate through bearings. Structurally symmetric gripper assemblies are respectively provided at the lower ends of the first gear shaft and the second gear shaft. The two ends of the connecting rod assembly are respectively connected to the mounting frame and the upper end of the first gear shaft. The connecting rod assembly includes two articulated connecting rods. When the moving mounting plate slides relative to the mounting frame, due to the change in distance, the two connecting rods in the connecting rod assembly will swing. This swing will drive the first gear shaft connected to it to rotate. At the same time, under the meshing action of the first transmission gear and the second transmission gear, the second gear shaft will rotate synchronously and in the opposite direction to the first gear shaft. Therefore, the gripper assemblies at the lower ends of the first gear shaft and the second gear shaft will also swing accordingly. When the two gripper assemblies swing to form a straight line, the ear ropes are clamped out from the ear rope cutting and pulling mechanism in this state. When the two gripper assemblies swing to form a parallel shape or have a certain included angle, the ear rope welding mechanism is fixed to the mask body in this state (this process is as Figure 10 shown). According to the actual requirements of the number of mask processing stations in the mask production process, the number of ear rope rotating clamping mechanisms on the same outer side of the mask body conveyor belt is the same as the number of stations, and each ear rope rotating clamping mechanism is parallelly installed between the moving mounting plate and the mounting frame. Among them, as Figures 13-1 to 13-4 shown, the gripper assembly includes a pair of pneumatic grippers 16-1, a movable inclined block 16-2, an inclined block ejector rod 16-3, a gripper spring 16-4 and an auxiliary fixing block 16-5. Auxiliary fixing blocks are provided on the outer sides of the pneumatic grippers, and the outer sides of the pneumatic grippers are connected to the auxiliary fixing blocks through gripper springs. The movable inclined block is arranged between the two pneumatic grippers, and an inclined block ejector rod is connected to one side of the movable inclined block. The two pneumatic grippers are symmetrically installed. The cross-section of the movable inclined block is in an inverted triangular shape. The lower end of the movable inclined block is inserted between the two pneumatic grippers, and the two pneumatic grippers and the gripper springs are squeezed through the inclined surfaces on both sides, so that the two pneumatic grippers perform opening and closing actions. When this gripper assembly is in use, a ejector rod spring (used as a return spring) can also be arranged at the bottom of the inclined block ejector rod. An outer cover is arranged on the outer periphery of the inclined block ejector rod and is correspondingly connected to the lower end of the first gear shaft or the second gear shaft. The upper end of the inclined block ejector rod is externally connected to a pneumatic device. When the inclined block ejector rod drives the movable inclined block to move upward, under the action of the gripper springs on the outer sides of the two pneumatic grippers, the upper parts approach each other respectively, so that the lower parts and the clamping ends are in an open state. When the inclined block ejector rod drives the movable inclined block to move downward, the upper parts of the two pneumatic grippers are squeezed by the movable inclined block. At this time, the gripper springs contract, and the lower parts and the clamping ends of the pneumatic grippers are closed, and the ear ropes can be clamped.

[0058] As Figure 15As shown in the figure, the earloop welding mechanism includes an ultrasonic head 17, a pressing needle 18, a pressing needle cylinder 19, and a connecting frame 20. The ultrasonic head and the pressing needle are relatively arranged on the upper and lower sides of the mask body conveyor belt. There are two pressing needles, and the two pressing needles are arranged on the connecting frame. The pressing needle cylinder is installed at the top of the connecting frame. After the earloop rotating clamping mechanism sends the earloop to the preset position of the mask body, the pressing needle cylinder drives the connecting frame to drive the two pressing needles to press down simultaneously. Under the ultrasonic action of the ultrasonic head, both ends of the earloop are welded and fixed to the mask body. According to the actual requirements of the number of mask processing stations in the mask production process, on the same outer side of the mask body conveyor belt, the number of earloop welding mechanisms is the same as the number of stations, and the earloop welding mechanisms on both sides of the mask body are symmetrically installed.

[0059] In the above device structure, the mask body conveyor belt can be the same as that in the traditional device.

[0060] In this embodiment, a multi-station double-side welding method for mask earloops is realized through the above device, including the following steps:

[0061] (1) The formed mask body is continuously conveyed by the mask body conveyor belt, and the external unwinding mechanism continuously unwinds the earloops.

[0062] (2) On both sides of the mask body conveyor belt, the earloop cutting and pulling-out mechanisms at each mask processing station pull out the earloops according to the preset length.

[0063] (3) On both sides of the mask body conveyor belt, with the overall lifting of the earloop cutting and pulling-out mechanism, the earloop rotating clamping mechanisms at each mask processing station clamp the earloops from the earloop cutting and pulling-out mechanism, the earloop cutting and pulling-out structure cuts the earloops, and the clamped part forms a single independent earloop.

[0064] (4) The earloop rotating clamping mechanism sends the earloop to the corresponding position of the mask body on the mask body conveyor belt, and the earloop welding mechanism welds and fixes the earloops on both sides of the mask body to the mask body simultaneously.

[0065] When the multi-station double-sided welding equipment and method for mask ear ropes are in use, the principle is as follows: By respectively arranging a symmetrically-structured ear rope cutting and pulling-out mechanism, an ear rope rotating and clamping mechanism, and an ear rope welding mechanism on both sides of the mask body conveyor belt, the ear ropes can be welded on both sides of the mask body simultaneously during mask processing, achieving double-sided welding; and on the same side of the mask body conveyor belt, multiple groups of ear rope cutting and pulling-out mechanisms, ear rope rotating and clamping mechanisms, and ear rope welding mechanisms are distributed from bottom to top, with each group corresponding to a mask processing station. Therefore, multi-station simultaneous welding can also be achieved; thus, the problem of low welding speed of traditional equipment is solved, and a certain number of stations can be expanded according to actual production needs. In addition, through the reasonable distribution and structural design of each functional mechanism, the use of action cylinders can be greatly reduced, improving the operation stability of the equipment.

[0066] As described above, the present invention can be preferably implemented. The above embodiments are only preferred embodiments of the present invention and are not used to limit the scope of implementation of the present invention; that is, all equivalent changes and modifications made according to the content of the present invention are covered by the scope protected by the claims of the present invention.

Claims

1. A multi-station double-sided welding device for mask ear ropes, characterized in that, It includes a mask body conveyor belt, an earloop cutting and pulling-out mechanism, an earloop rotating and clamping mechanism, and an earloop welding mechanism. The mask body conveyor belt is arranged in the middle of the equipment. The earloop welding mechanism is arranged on the upper and lower sides of the mask body conveyor belt. At least one pair of earloop cutting and pulling-out mechanisms and at least one pair of earloop rotating and clamping mechanisms are symmetrically arranged on the left and right sides of the mask body conveyor belt. The earloop cutting and pulling-out mechanism is located below the earloop rotating and clamping mechanism. At the earloop rotating and clamping mechanism, there is also an installation frame and a movable mounting plate in the welding equipment. The movable mounting plate is slidably connected to the installation frame, and the earloop rotating and clamping mechanism is installed between the movable mounting plate and the installation frame. The earloop rotating and clamping mechanism includes a connecting rod assembly, a first transmission gear, a second transmission gear, a first gear shaft, a second gear shaft, and a pneumatic claw assembly. The first transmission gear and the second transmission gear are meshed and connected. A first gear shaft is arranged in the middle of the first transmission gear, and a second gear shaft is arranged in the middle of the second transmission gear. The outer peripheries of the first gear shaft and the second gear shaft are both installed on the movable mounting plate through bearings. The lower ends of the first gear shaft and the second gear shaft are respectively provided with pneumatic claw assemblies with symmetrical structures. The two ends of the connecting rod assembly are respectively connected to the installation frame and the upper end of the first gear shaft. The earloop welding mechanism includes an ultrasonic head, a pressing needle, a pressing needle cylinder, and a connecting frame. The ultrasonic head and the pressing needle are relatively arranged on the upper and lower sides of the mask body conveyor belt. There are two pressing needles, and the two pressing needles are arranged on the connecting frame. The pressing needle cylinder is installed at the top of the connecting frame.

2. The multi-station double-sided welding device for mask ear ropes according to claim 1, wherein, The earloop cutting and pulling-out mechanism includes a pulling-out driving component, a fixed clamping component, a movable clamping component, a cutting component, a mounting bracket, and a guide rail. The guide rail is arranged on the mounting bracket. The fixed clamping component and the cutting component are arranged at one end of the guide rail. The cutting component is located inside the fixed clamping component. The movable clamping component is arranged on the guide rail and moves along the guide rail. The pulling-out driving component is arranged on one side of the guide rail and is connected to the movable clamping component.

3. The multi-station double-sided welding device for mask ear ropes according to claim 2, characterized in that, When there are multiple earloop cutting and pulling-out mechanisms on the same side of the mask body conveyor belt, the fixed clamping component, the movable clamping component, the cutting component, the mounting bracket, and the guide rail in each earloop cutting and pulling-out mechanism form a cutting and pulling-out unit. Multiple cutting and pulling-out units share one pulling-out driving component. The movable clamping components in each cutting and pulling-out unit are fixedly connected. The movable clamping component located on the outermost side is connected to the pulling-out driving component. A lifting mounting plate is also arranged at the bottom of each earloop cutting and pulling-out mechanism.

4. The multi-station double-sided welding device for mask ear ropes according to claim 3, characterized in that, The fixed clamping component includes a fixed clamping cylinder and a fixed clamping jaw. The fixed clamping jaw is arranged at the end of the fixed clamping cylinder. The cutting component includes a cushion block, a cutting knife, a cutting knife cylinder, and a support frame. The cushion block is arranged opposite to the cutting knife, and an earloop channel is formed between the cushion block and the cutting knife. The cutting knife is arranged at the end of the cutting knife cylinder. The cutting knife cylinder is installed on one side of the support frame, and the fixed clamping cylinder is installed on the other side of the support frame. The moving clamping assembly includes a moving clamping cylinder, moving jaws, a slider, and a fixed support block. The moving jaws are arranged at the end of the moving clamping cylinder, the moving clamping cylinder is installed on the fixed support block, the slider is installed at the bottom of the fixed support block, and the slider is matched with the guide rail. When there are multiple cut-off and pulling-out units, the fixed support blocks between adjacent two moving clamping assemblies are fixedly connected, and the fixed support block at the outermost side is connected to the driving assembly. The pulling driving assembly includes a conveyor belt and conveyor belt wheels that are matched with each other. The fixed support block is fixedly installed on the conveyor belt, and the conveyor belt wheels are externally connected to a power driving device.

5. The multi-station double-sided welding device for mask ear ropes according to claim 2, characterized in that, In the earstring cut-off and pulling-out mechanism, the guide rail is inclined with respect to the conveying direction of the mask body conveyor belt.

6. The multi-station double-sided welding device for mask ear ropes according to claim 1, wherein, In the earstring rotating clamping mechanism, the air claw assembly includes a pair of pneumatic claws, a movable inclined block, an inclined block ejector rod, a claw spring, and an auxiliary fixed block. An auxiliary fixed block is arranged on the outer side of each pneumatic claw, and the outer side of each pneumatic claw is connected to the auxiliary fixed block through a claw spring. The movable inclined block is arranged between the two pneumatic claws, and an inclined block ejector rod is connected to one side of the movable inclined block. The two pneumatic claws are symmetrically installed. The cross-section of the movable inclined block is in an inverted triangular shape, and the lower end of the movable inclined block is inserted between the two pneumatic claws.

7. A multi-station bilateral welding method for mask ear ropes implemented by the device according to any one of claims 1 to 6, characterized in that, It includes the following steps: (1) The formed mask body is continuously conveyed by the mask body conveyor belt, and the external unwinding mechanism continuously unwinds the earstrings. (2) On both sides of the mask body conveyor belt, the earstring cut-off and pulling-out mechanisms at each mask processing station pull out the earstrings according to a preset length. (3) On both sides of the mask body conveyor belt, the earstring rotating clamping mechanisms at each mask processing station clamp the earstrings from the earstring cut-off and pulling-out mechanisms. The earstring cut-off and pulling-out structure cuts off the earstrings, and the part clamped by the earstring rotating clamping mechanism forms a single independent earstring. (4) The earstring rotating clamping mechanism sends the earstrings to the corresponding positions of the mask body on the mask body conveyor belt, and the earstring welding mechanism simultaneously welds and fixes the earstrings on both sides of the mask body to the mask body.

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