A single cylinder driven automatic welding mechanism for mask ear straps

Abstract

The present invention discloses a single-cylinder driven automatic welding mechanism for mask ear straps, which includes a first cylinder, a first stroke plate driven by the first cylinder to perform horizontal linear motion, a second stroke plate installed on the first stroke plate through a first elastic connection component, a pair of ultrasonic welding heads fixedly arranged on the second stroke plate, a third stroke plate installed on the second stroke plate through a second elastic connection component, a fixed-length winding unit and an ear strap locking unit fixed on the third stroke plate, and an off-line driving component movably arranged on the third stroke plate through a reset elastic connection component and driven by the second stroke plate to perform horizontal linear motion. The present invention only requires one cylinder drive to realize the pressing, welding and unhooking actions of the ear straps, and the overall structure is compact, the space occupancy is small, and the welding strength is high.

Description

[Technical field]

[0001] The invention belongs to the technical field of mask manufacturing equipment, and in particular relates to a single-cylinder driven automatic welding mechanism for mask ear straps. [Background technology]

[0002] Masks are a type of sanitary protective equipment, usually worn on the nose and mouth to filter the air entering the nose and mouth, and block droplets, dust, pollen and other substances in the air. Masks are generally hung on the ears of the human body with ear straps so that the mask body can fit the nose and mouth. Therefore, in the production process of masks, one of the steps is to bend the ear straps into a semicircular shape, and then weld the two ends of the ear straps to the mask body.

[0003] The manufacturing of traditional mask ear straps is to manually cut out a small section, then manually bend the cut ear straps into a semicircle, and fix the ear straps on the mask body by holding the two ends of the ear straps, and finally weld the ear straps with a welder. This method has high labor costs, low production efficiency, high work intensity, and mechanical repetition. If you are not careful, quality problems such as wrong welding and leaking welding may occur. There are also ultrasonic automatic welding devices in the prior art to achieve the welding of ear straps, but the entire device has more driving sources, high manufacturing costs, and a complicated structure, which occupies a large space. In addition, the welding strength of the ear straps is not high and they are easily pulled off.

[0004] Therefore, it is necessary to provide a new single-cylinder driven mask ear strap automatic welding mechanism to solve the above problems. [Summary of the invention]

[0005] The main purpose of the present invention is to provide a single-cylinder driven mask ear strap automatic welding mechanism, which only needs one cylinder drive to realize the pressing, welding and unhooking actions of the ear strap, has a compact overall structure, occupies little space, and has high welding strength.

[0006] The present invention achieves the above-mentioned purpose through the following technical scheme: a single-cylinder driven mask ear strap automatic welding mechanism, which includes a first cylinder, a first stroke plate driven by the first cylinder to perform horizontal linear motion, a second stroke plate installed on the first stroke plate through a first elastic connecting component, a pair of ultrasonic welding heads fixedly arranged on the second stroke plate, a third stroke plate installed on the second stroke plate through a second elastic connecting component, a fixed-length winding unit and an ear strap locking unit fixed on the third stroke plate, and an off-line driving component movably arranged on the third stroke plate through a reset elastic connecting component and driven by the second stroke plate to perform horizontal linear motion.

[0007] Furthermore, the first elastic connection component includes at least one pair of second guide rods movably passing through the first stroke plate, and a three-stage stroke compression spring sleeved on the second guide rod and with one end abutting against the first stroke plate and the other end abutting against the second stroke plate; the front end portion of the second guide rod is fixedly connected to the second stroke plate.

[0008] Furthermore, the second elastic connection assembly includes at least one pair of third guide rods movably passing through the second stroke plate, and a secondary stroke compression spring sleeved on the third guide rod and having one end abutting against the second stroke plate and the other end abutting against the third stroke plate; the front end portion of the third guide rod is fixedly connected to the third stroke plate.

[0009] Furthermore, the fixed-length winding unit includes a motor fixed on the third stroke plate, a winding bracket driven to rotate by the motor, a first pair of wire clamping assemblies and a second pair of wire clamping assemblies symmetrically arranged on the left and right sides of the winding bracket and distributed up and down, and fixed-length winding guide blocks symmetrically arranged at the upper and lower ends of the winding bracket.

[0010] Furthermore, the first pair of wire clamping assemblies and the fixed-length winding guide block at the upper end form an ear band wire fixed-length feeding unit, and the second pair of wire clamping assemblies and the fixed-length winding guide block at the lower end form another ear band wire fixed-length feeding unit, and the two ear band wire fixed-length feeding units realize alternating continuous feeding through rotation.

[0011] Furthermore, the first pair of wire clamping assemblies and the second pair of wire clamping assemblies have the same structure and both include wire clamping hooks rotatable through a rotating shaft and symmetrically arranged on the left and right sides of the winding bracket.

[0012] Furthermore, the ear strap locking unit includes a second cylinder fixed on the third stroke plate, and a wire clamp locking plate driven by the second cylinder to perform axial movement, and the wire clamp locking plate is provided with a first pressing portion and a second pressing portion for respectively pressing the two wire clamping hooks located on the same side of the winding bracket to keep them in a clamped state.

[0013] Furthermore, the reset elastic connection assembly includes at least one pair of fourth guide rods movably passing through the third stroke plate, a limit fixing ring fixedly sleeved on the fourth guide rod, and a unhooking reset spring sleeved on the fourth guide rod and with one end abutting against the limit fixing ring and the other end abutting against the surface of the third stroke plate; the fourth guide rod passes through the second stroke plate and pushes the limit fixing ring through the second stroke plate to achieve horizontal movement.

[0014] Furthermore, the off-line driving assembly includes a wire clamp releasing pressure plate fixed to the front end of the fourth guide rod, and a wire clamp pushing piece fixed to the wire clamp releasing pressure plate and pushing the wire on the fixed-length winding guide block at the lower end to achieve off-line.

[0015] Furthermore, the wire clamp release pressure plate is provided with a third pressing portion and a fourth pressing portion for respectively pressing two wire clamp hooks located on the left and right sides below the winding bracket to keep them in an open state.

[0016] Compared with the prior art, the single-cylinder driven automatic welding mechanism for mask ear straps of the present invention has the following beneficial effects: the three actions of pressing, welding and unhooking of the mask ear straps can be completed by driving one cylinder, while the conventional design on the market is that the three structural actions are completed by three different groups of cylinders; the setting of the driving source is greatly saved, the production cost is saved, and the market competitiveness is improved; the structure designed in the scheme has good action continuity, so that the pressing, welding and unhooking are coherent and compact, the gap invalid time between each action is shortened, and compared with the three-group cylinder drive in the prior art, the scheme does not have the mutual waiting time (signal interaction) between the cylinders, the action time is faster, the production capacity is higher, and the production efficiency is greatly improved; the welding pressure and welding time of the ultrasonic welding head on the ear strap can be more accurately controlled by elastic pressure, thereby greatly improving the welding quality, strengthening the welding strength of the ear strap, and improving the quality of the mask.

Brief Description of the Drawings

[0017] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0018] Figure 2 It is a schematic diagram of the front part of the embodiment of the present invention;

[0019] Figure 3 Schematic diagram of the structure of a fixed-length winding unit in an embodiment of the present invention;

[0020] Figure 4 It is a schematic diagram of the structure of the ear strap locking unit, the resetting elastic connection assembly and the off-line driving assembly in an embodiment of the present invention;

[0021] The numbers in the figure represent:

[0022] 100 single cylinder driven automatic welding mechanism for mask ear straps;

[0023] 1 support; 2 first cylinder;

[0024] 3 first stroke plate, 31 first guide rod, 32 third-stage stroke limit block;

[0025] 4 first elastic connection assembly, 41 second guide rod, 42 third-stage stroke compression spring, 43 second-stage stroke limit block;

[0026] 5 second stroke plate; 6 ultrasonic welding head;

[0027] 7 second elastic connection assembly, 71 third guide rod, 72 secondary stroke compression spring, 73 primary stroke limit block;

[0028] 8 third stroke board;

[0029] 9 fixed-length winding unit, 91 motor, 92 winding bracket, 93 first pair of clamping components, 931 clamping hook, 94 second pair of clamping components, 95 fixed-length winding guide block;

[0030] 10 ear strap locking unit, 101 second cylinder, 102 wire clamp locking plate, 103 first pressing portion, 104 second pressing portion;

[0031] 11 resetting elastic connection assembly, 111 fourth guide rod, 112 limiting fixing ring, 113 unhooking resetting spring;

[0032] 12 is an off-line driving component, 121 is a wire clamp releasing pressure plate, 122 is an off-line pushing piece, 123 is a third pressing part, and 124 is a fourth pressing part. [Specific implementation method]

[0033] Example:

[0034] In this embodiment, "axial direction" refers to a direction parallel to or colinear with the driving direction of the first cylinder.

[0035] Please refer to Figure 1-Figure 4 The present embodiment is a single-cylinder driven mask ear strap automatic welding mechanism 100, which includes a support 1, a first cylinder 2 fixed on the support 1, a first stroke plate 3 driven by the first cylinder 2 to perform horizontal linear motion, a second stroke plate 5 installed on the first stroke plate 3 through a first elastic connection component 4, a pair of ultrasonic welding heads 6 fixedly arranged on the second stroke plate 5, a third stroke plate 8 installed on the second stroke plate 5 through a second elastic connection component 7, a fixed-length winding unit 9 and an ear strap locking unit 10 fixed on the third stroke plate 8, and an off-line driving component 12 movably arranged on the third stroke plate 8 through a reset elastic connection component 11 and driven by the second stroke plate 5 to perform horizontal linear motion.

[0036] During the movement, the second stroke plate 5 drives the off-line driving component 12 by acting on the resetting elastic connecting component 11 .

[0037] The first travel plate 3 is provided with four first guide rods 31 penetrating the support 1 , and the first guide rods 31 are provided with three-stage travel limit blocks 32 .

[0038] The first elastic connection assembly 4 includes at least one pair of second guide rods 41 that movably penetrate the first stroke plate 3, and a three-stage stroke compression spring 42 that is sleeved on the second guide rod 41 and has one end against the first stroke plate 3 and the other end against the second stroke plate 5. The second guide rod 41 axially slidably penetrates the first stroke plate 3 through a linear bearing. A two-stage stroke limit block 43 is also provided on the second guide rod 41. The front end of the second guide rod 41 is fixedly connected to the second stroke plate 5.

[0039] The second elastic connection assembly 7 includes at least one pair of third guide rods 71 ​​that movably penetrate the second stroke plate 5, and a secondary stroke compression spring 72 that is sleeved on the third guide rod 71 and has one end against the second stroke plate 5 and the other end against the third stroke plate 8. The third guide rod 71 axially slidably penetrates the first stroke plate 3 through a linear bearing. The third guide rod 71 is also provided with a primary stroke limit block 73. The front end of the third guide rod 71 is fixedly connected to the third stroke plate 8.

[0040] The fixed-length winding unit 9 includes a motor 91 fixed on the third stroke plate 8, a winding bracket 92 driven to rotate by the motor 91, a first pair of clamping components 93 and a second pair of clamping components 94 symmetrically arranged on the left and right sides of the winding bracket 92 and distributed up and down, and a fixed-length winding guide block 95 symmetrically arranged at the upper and lower ends of the winding bracket 92. The winding bracket 92 is fixedly arranged on a rotating shaft, and the rotating shaft is rotatably arranged on the third stroke plate 8 through a bearing. The rotating shaft is connected to the motor 91 through a synchronous belt and a synchronous pulley for rotational transmission, and is driven by the motor 91 to rotate, thereby driving the winding bracket 92 to rotate. The upper and lower fixed-length winding guide blocks 95 realize automatic wire drawing and fixed-length wire drawing of the wire by rotating with the winding bracket 92. The distance between the two fixed-length winding guide blocks 95 can be flexibly adjusted according to the length of the ear band, so that the length of the wire from the left clamping component, bypassing the fixed-length winding guide block 95 at the upper or lower end, and then reaching the clamping component on the right is equal to the set ear band length. The first pair of wire clamping assemblies 93 and the fixed-length winding guide block 95 at the upper end form an ear band wire fixed-length feeding unit, and the second pair of wire clamping assemblies 94 and the fixed-length winding guide block 95 at the lower end form another ear band wire fixed-length feeding unit. The two ear band wire fixed-length feeding units realize alternating continuous feeding through rotation, which greatly improves welding efficiency. The first pair of wire clamping assemblies 93 and the second pair of wire clamping assemblies 94 have the same structure, and both include wire clamping hooks 931 that can be rotated through a rotating shaft and are symmetrically arranged on the left and right sides of the winding bracket 92. The wire clamping assembly can adopt an existing structure on the market, and the state switching between clamping and loosening can be realized by applying a driving force to the corresponding parts of the rotating arms at both ends of the wire clamping hooks.

[0041] The ear strap locking unit 10 includes a second cylinder 101 fixed on the third stroke plate 8, and a wire clamp locking plate 102 driven by the second cylinder 101 to perform axial movement. The wire clamp locking plate 102 is provided with a first pressing portion 103 and a second pressing portion 104 for pressing two wire clamping hooks 931 located on the same side of the winding bracket 92 to keep them in a clamped state.

[0042] The resetting elastic connection assembly 11 includes at least one pair of fourth guide rods 111 that movably penetrate the third stroke plate 8, a position-limiting fixing ring 112 that is fixedly sleeved on the fourth guide rod 111, and a decoupling resetting spring 113 that is sleeved on the fourth guide rod 111 and has one end against the position-limiting fixing ring 112 and the other end against the surface of the third stroke plate 8. The fourth guide rod 111 penetrates the second stroke plate 5 and pushes the position-limiting fixing ring 112 through the second stroke plate 5 to achieve horizontal movement.

[0043] The de-wire driving assembly 12 includes a wire clamp release plate 121 fixed to the front end of the fourth guide rod 111, and a de-wire push piece 122 fixed to the wire clamp release plate 121 and pushing out the wire on the fixed-length winding guide block 95 at the lower end to achieve de-wire. The wire clamp release plate 121 is provided with a third pressing portion 123 and a fourth pressing portion 124 that respectively press the two wire clamp hooks 931 located on the left and right sides below the winding bracket 92 to keep them in an open state. The de-wire push piece 122 is a sheet-like structure that imitates the outer contour of the fixed-length winding guide block 95. By pushing it into the outer periphery of the fixed-length winding guide block 95 along the axial direction and covering it, the wire on the fixed-length winding guide block 95 is pushed out to achieve de-wire.

[0044] The ultrasonic welding head 6 passes through the surface of the third stroke plate 8 and is provided with two ends of the ear strap for welding respectively.

[0045] The spring force of the third-stage stroke compression spring 42 is greater than that of the second-stage stroke compression spring 72 .

[0046] The working principle of the single cylinder driven mask ear strap automatic welding mechanism 100 of this embodiment is as follows:

[0047] 1) The first cylinder 2 drives the first stroke plate 3 forward, and the thrust is transmitted to the second stroke plate 5 through the third stroke compression spring 42. The second stroke plate 5 then transmits the thrust to the third stroke plate 8 through the second stroke compression spring 72, and finally drives the front end surface of the winding bracket 92 to press the mask. The stroke is adjusted by the first stroke limit block 73 on the third guide rod 71;

[0048] 2) After the fixed-length winding unit 9 compresses the mask, the first cylinder 2 continues to output thrust, which is transmitted by the first stroke plate 3, the third-stage stroke compression spring 42, and the second stroke plate 5, compressing the second-stage stroke compression spring 72, prompting the ultrasonic welding head 6 loaded on the second stroke plate 5 to move forward to weld and press the ear strap, thereby starting ultrasonic welding;

[0049] 3) When the mask ear straps are welded, the first cylinder 2 continues to output thrust, which is transmitted by the first stroke plate 3, compressing the three-stage stroke compression spring 42, pushing the second stroke plate 5 forward, and the second stroke plate 5 pushes the line clamp release plate 121 forward through the limit fixing ring 112 and the fourth guide rod 111, and then the unhooking action of the mask ear straps is completed by the off-line push piece 122, the third pressing part 123 and the fourth pressing part 124 arranged on the line clamp release plate 121, and the stroke is adjusted by the three-stage stroke limit block 32 on the first guide rod 31; at this time, the clamping hook 931 at the lower left side and the clamping hook 931 at the lower right side are in an open state by the third pressing part 123 and the fourth pressing part 124; the clamping hook 931 at the upper right side is in a clamped state, and the clamping hook at the upper left side is in an open state;

[0050] 4) After the mask ear strap welding action is completed, the first cylinder 2 is reset, and all mechanisms automatically return to their original positions, waiting for the second welding. At this time, the motor 91 in the fixed-length winding unit 9 drives the winding bracket 92 to rotate 180°, so that the original clamping hook 931 on the upper right side clamps the thread head and rotates to the position of the clamping hook on the lower left side, and then the second cylinder 101 drives the clamp locking plate 102 to move, and the first pressing part 103 and the second pressing part 104 are used to press the clamping hook on the upper right side and the clamping hook on the lower right side in the new position to switch to the clamping state, thereby completing the fixed-length automatic feeding action of the ear strap; then cooperate with the external wire cutting mechanism to cut the wire between the upper right wire clamping hook and the lower right wire clamping hook, and the next cycle of ear strap welding can be carried out.

[0051] The beneficial effect of the single-cylinder driven mask ear strap automatic welding mechanism 100 of the present embodiment is that the three actions of pressing, welding and unhooking of the mask ear strap can be completed by driving one cylinder, while the conventional design on the market is that the three structural actions are completed by three different groups of cylinders; the setting of the driving source is greatly saved, the production cost is saved, and the market competitiveness is improved; the structure designed in this scheme has good action continuity, so that the pressing, welding and unhooking are coherent and compact, and the gap invalid time between each action is shortened. Compared with the three-group cylinder drive in the prior art, this scheme has no mutual waiting time (signal interaction) between cylinders, the action time is faster, the production capacity is higher, and the production efficiency is greatly improved; the elastic pressure can more accurately control the welding pressure and welding time of the ultrasonic welding head on the ear strap, thereby greatly improving the welding quality, strengthening the welding strength of the ear strap, and improving the quality of the mask.

[0052] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A single cylinder driven automatic welding mechanism for mask ear straps, characterized in that: It includes a first cylinder, a first stroke plate driven by the first cylinder to perform horizontal linear motion, a second stroke plate installed on the first stroke plate through a first elastic connection component, a pair of ultrasonic welding heads fixedly arranged on the second stroke plate, a third stroke plate installed on the second stroke plate through a second elastic connection component, a fixed-length winding unit and an ear strap locking unit fixed on the third stroke plate, and an off-line driving component movably arranged on the third stroke plate through a reset elastic connection component and driven by the second stroke plate to perform horizontal linear motion.

2. The single-cylinder driven automatic welding mechanism for mask ear straps according to claim 1, characterized in that: The first elastic connection component includes at least one pair of second guide rods movably passing through the first stroke plate, and a three-stage stroke compression spring sleeved on the second guide rod and with one end abutting against the first stroke plate and the other end abutting against the second stroke plate; the front end of the second guide rod is fixedly connected to the second stroke plate.

3. The single-cylinder driven automatic welding mechanism for mask ear straps according to claim 1, characterized in that: The second elastic connection assembly includes at least one pair of third guide rods movably passing through the second stroke plate, and a secondary stroke compression spring sleeved on the third guide rod and having one end abutting against the second stroke plate and the other end abutting against the third stroke plate; the front end portion of the third guide rod is fixedly connected to the third stroke plate.

4. The single-cylinder driven mask ear strap automatic welding mechanism according to claim 1, characterized in that: The fixed-length winding unit includes a motor fixed on the third stroke plate, a winding bracket driven to rotate by the motor, a first pair of wire clamping assemblies and a second pair of wire clamping assemblies symmetrically arranged on the left and right sides of the winding bracket and distributed up and down, and fixed-length winding guide blocks symmetrically arranged at the upper and lower ends of the winding bracket.

5. The single-cylinder driven automatic welding mechanism for mask ear straps as claimed in claim 4, characterized in that: The first pair of wire clamping assemblies and the fixed-length winding guide block at the upper end form an ear band wire fixed-length feeding unit, and the second pair of wire clamping assemblies and the fixed-length winding guide block at the lower end form another ear band wire fixed-length feeding unit. The two ear band wire fixed-length feeding units realize alternating continuous feeding through rotation.

6. The single-cylinder driven automatic welding mechanism for mask ear straps according to claim 4, characterized in that: The first pair of wire clamping assemblies and the second pair of wire clamping assemblies have the same structure and both include wire clamping hooks rotatable through a rotating shaft and symmetrically arranged on the left and right sides of the winding bracket.

7. The single-cylinder driven automatic welding mechanism for mask ear straps according to claim 6, characterized in that: The ear strap locking unit includes a second cylinder fixed to the third stroke plate, and a wire clamp locking plate driven by the second cylinder to perform axial movement, and the wire clamp locking plate is provided with a first pressing portion and a second pressing portion for respectively pressing the two wire clamping hooks located on the same side of the winding bracket to keep them in a clamped state.

8. The single-cylinder driven automatic welding mechanism for mask ear straps according to claim 6, characterized in that: The reset elastic connection assembly includes at least one pair of fourth guide rods movably passing through the third stroke plate, a limit fixing ring fixedly sleeved on the fourth guide rod, and a decoupling reset spring sleeved on the fourth guide rod and with one end abutting against the limit fixing ring and the other end abutting against the surface of the third stroke plate; the fourth guide rod passes through the second stroke plate and pushes the limit fixing ring through the second stroke plate to achieve horizontal movement.

9. The single-cylinder driven automatic welding mechanism for mask ear straps according to claim 8, characterized in that: The de-wire driving assembly includes a wire clamp releasing pressure plate fixed to the front end of the fourth guide rod, and a wire de-wire pushing piece fixed to the wire clamp releasing pressure plate and pushing out the wire on the fixed-length winding guide block at the lower end to achieve de-wire.

10. The single-cylinder driven automatic welding mechanism for mask ear straps according to claim 9, characterized in that: The wire clamp release pressing plate is provided with a third pressing portion and a fourth pressing portion for respectively pressing two wire clamp hooks located on the left and right sides below the winding bracket to keep them in an open state.

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