Inflatable bathtub cover manufacturing machine

Abstract

The present invention relates to an inflatable bathtub cover manufacturing machine, comprising a frame, a film unwinding device, a rubber band welding device, a longitudinal folding device, a transverse welding device, a cutting device, and a traction roller group. The characteristics of the invention are: the film unwinding device comprises at least two sets of unwinding rollers mounted on the frame, a heat sealing mechanism capable of heat-sealing the two seams of the stacked materials; and an airway stamping device distributed between the rubber band welding device and the longitudinal folding device. The beneficial effects of the present invention are: providing a brand-new bathtub cover manufacturing machine, which can produce bathtub covers with at least double layers of film and internal inflatable gas. When people use the bathtub cover, they do not come into direct contact with the bathtub. Instead, a gas layer is filled between the human body and the bathtub, thereby preventing babies, the elderly, and other people from being injured. Compared with traditional bathtub covers, the bathtub cover is extremely comfortable to use and greatly improves the user experience.

Description

Technical Field

[0001] The invention relates to bathtub cover and bathtub cover processing equipment, in particular to an inflatable bathtub cover manufacturing machine. Background Art

[0002] A bathtub cover is a bathing tool that is placed on a bathtub. For example, when people take a bath in a public bathhouse, hotel, etc., they use a bathtub cover to prevent the spread and infection of diseases.

[0003] For example, patent publication number CN201197675Y discloses a "disposable bathtub cover" consisting of a bag and a skirt. The bag unfolds into a cylindrical plastic container, and the skirt is equipped with a water bag, an air bag for inflation, or an elastic wire. This bathtub cover primarily improves the fixing method of the bathtub cover, mainly utilizing the water bag, air bag, or elastic wire installed in the skirt.

[0004] While the bathtub cover provided in the aforementioned document is equipped with a water bag, air bag, or elastic steel wire on the skirt, the primary technical effect of these "water bag, air bag, or elastic steel wire" is to improve the securing method of the bathtub cover's opening. The bag body of the bathtub cover is composed of a single layer of film. When in use, the bathtub cover is unfolded and placed on the bathtub. When seated inside the bathtub cover, the body directly bears the support force of the bathtub. Because babies are softer than bathtubs, they are susceptible to bumps and collisions when using existing bathtub covers. Therefore, improvements to existing bathtub covers are necessary.

[0005] Provided is an inflatable bathtub cover. When in use, gas can be injected into the bathtub cover to expand the bathtub cover so that gas is separated from the bathtub and the human body, thereby preventing babies, the elderly and other people from being injured.

[0006] Designing an inflatable bathtub cover requires corresponding processing equipment, but existing bathtub cover processing equipment is unable to produce such a bathtub cover. For example, the invention patent document with publication number "CN209694160U" discloses a shower cap machine, which can also be used to process bathtub covers by simply changing the raw material size.

[0007] The film unwinding device of the shower cap machine is composed of only a set of feeding rubber rollers, and is unable to produce a bag body having at least two layers of film stacked on each other.

[0008] Furthermore, the shower cap machine cannot also process the air duct on this type of bathtub cover.

[0009] Therefore, it is necessary to improve the existing bathtub cover processing equipment and provide a device that can assist in processing an inflatable bathtub cover. Summary of the Invention

[0010] The technical problem to be solved by the present invention is to address the deficiencies of the above-mentioned existing technologies and provide a new bathtub cover manufacturing machine, which can process bathtub covers with at least double-layer coating and internal inflatable gas. When people use this bathtub cover, they will not come into direct contact with the bathtub. Instead, a gas layer is filled between the human body and the bathtub, thereby preventing babies, the elderly and other people from being injured. Compared with traditional bathtub covers, the bathtub cover is extremely comfortable to use and greatly improves the user experience.

[0011] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an inflatable bathtub cover manufacturing machine, comprising a frame, on which are installed a film unwinding device, a rubber band welding device, a longitudinal folding device, a transverse welding device, and a cutting device arranged in sequence along the effective transport direction; the frame is also provided with a traction roller group for delivering the material along the effective transport direction; and the feature is that the film unwinding device comprises at least two groups of unwinding rollers installed on the frame, and a heat sealing mechanism that can heat-seal the two seams of the stacked materials.

[0012] The above technical solution has the following advantages: (1) It realizes the feeding of at least two layers of film and can heat-seal the seams of the two layers of film. Compared with the existing bathtub cover processing equipment, it provides a new bathtub cover manufacturing machine, which can process bathtub covers with at least two layers of film and can be inflated. Among them, by providing at least two sets of unloading rollers, at least two layers of film can be transported; further, a heat sealing mechanism is added to heat-seal the seams of the two layers of film, so that the two layers of film become one, and an inflatable cavity exists between the two layers of film, which assists in the processing of the bathtub cover with at least two layers of film and can be inflated; further, the traction roller group is reasonably arranged to transport the at least two layers of film, and they are stacked on each other at the heat sealing mechanism, which facilitates the heat sealing mechanism to heat-seal the edges of the at least two layers of film. (2) When the bathtub cover manufactured by the equipment provided by the present technical solution is used, air is inflated between each two adjacent layers of film, thereby forming an air layer between each two adjacent sets of film. When people use the bathtub cover, they do not come into direct contact with the bathtub. Instead, a gas layer is filled between the human body and the bathtub, thereby preventing babies, the elderly and other people from being injured. Compared with traditional bathtub covers, the bathtub cover is extremely comfortable to use and greatly improves the user experience.

[0013] The above-mentioned inflatable bathtub cover manufacturing machine can be further configured as follows: an airway stamping device distributed between the rubber band welding device and the longitudinal folding device is also installed on the frame.

[0014] By adopting the above technical solution, an air channel of the inflatable bathtub cover can be processed. Gas is injected into the bathtub cover through the air channel to make the bathtub cover expand. There is gas between the bathtub and the human body, which can prevent babies, the elderly and other vulnerable groups from being injured.

[0015] The above-mentioned inflatable bathtub cover manufacturing machine can be further configured as follows: the air duct embossing device includes a printing roller and a heat-sealing traction roller, the axes of the printing roller and the heat-sealing traction roller are parallel to each other and are installed on the frame in an opposite arrangement, the printing roller is linked to a drive motor and a heat source component, and the surface of the printing roller is provided with an air duct embossing pattern protruding toward the outside.

[0016] By adopting the above technical solution, the function of the air duct embossing pattern is to form the air duct shape of the bathtub cover, which is further pressed together by the printing roller and the heat-sealing traction roller. During this period, the printing roller is heated by the heat source component to realize the processing of the air duct of the inflatable bathtub cover; wherein, the heat source component can be selected from a conductive ring and a carbon brush assembly, and the printing roller needs to be heated during the printing process. The heat source component is used to connect to the power supply, and one group of them is a thermocouple temperature output.

[0017] The above-mentioned inflatable bathtub cover manufacturing machine can be further configured as follows: the frame is provided with a slide rail distributed perpendicular to the effective transport direction, the two ends of the printing roller are respectively hingedly linked with sliding blocks, the sliding blocks and the slide rails can slide together, the sliding block is detachably connected to a pressure roller fixing block distributed above the sliding block, the pressure roller fixing block is linked to a pressure roller hinged on the frame, and the pressure roller is linked to a handle.

[0018] The above technical solution is adopted to set a slide rail, a sliding block, a pressure roller fixing block, a pressure roller, and a handle, so that the printing roller can float up and down along the axis of the slide rail. Not only can the processing position be adjusted according to the actual thickness of the processed material, but also the material can be replaced conveniently. When the handle is shaken to the horizontal position, the printing roller leaves the traction roller and can be replaced at this time. When the handle is vertically upward, the printing roller and the heat-sealing traction roller are tightly combined for printing.

[0019] The above-mentioned inflatable bathtub cover manufacturing machine can be further configured as follows: the heat sealing mechanism includes a heating wheel shaft and several groups of heating wheels, the heating wheel shaft is installed on the frame perpendicular to the effective material transportation direction, and the several groups of heating wheels are arranged in sequence along the axis direction of the heating wheel shaft and installed on the heating wheel shaft.

[0020] By adopting the above technical solution, the function of heat sealing during transportation can be achieved. The seams of the two layers of film can be heat sealed so that the two layers of film become one, and an inflatable cavity exists between the two layers of film, thereby processing an inflatable bathtub cover with at least two layers of film.

[0021] The above-mentioned inflatable bathtub cover manufacturing machine can be further configured as: a group of unloading rollers are linked with a roll-changing mechanism, and the roll-changing mechanism includes a unloading arm and a roll-changing cylinder. One end of the unloading arm is hinged to the frame, and the other end is hinged to the end of the roll-changing cylinder. The other end of the roll-changing cylinder is hinged to the frame, and the other end of the unloading arm is provided with a first bayonet hinged to the unloading roller.

[0022] The above technical solution is adopted to facilitate the roll changing of a set of unwinding rollers, and the roll changing can be achieved without stopping the machine; when the lamination is completed, the roll changing cylinder pushes the unwinding arm downward to perform the roll changing operation.

[0023] The above-mentioned inflatable bathtub cover manufacturing machine can be further configured as follows: a second bayonet hinged to the end of another set of discharge rollers is provided on the frame, a brake plate is provided above the second bayonet, and the end of the brake plate is detachably connected to a movable bolt.

[0024] The above technical solution is adopted to facilitate the change of rolls of another set of unwinding rollers, and the roll change can be achieved without stopping the machine; furthermore, the roll changing structure adopts a second bayonet, a brake plate, and a movable bolt. Although the material needs to be lifted to a certain height when changing the roll, the roll changing structure is small in size and occupies little space.

[0025] The above-mentioned inflatable bathtub cover manufacturing machine can be further configured as follows: the frame is also equipped with an airway opening mechanism distributed between the discharge roller and the heat sealing mechanism and capable of opening an air port for any group of films.

[0026] By adopting the above technical solution, an air inlet can be processed to facilitate subsequent inflation between the two layers of film.

[0027] The above-mentioned inflatable bathtub cover manufacturing machine can be further configured as follows: the airway opening mechanism includes a circular knife core shaft installed on the frame, and a blade that can open an air hole for any group of coatings is relatively fixedly connected to the circular knife core shaft.

[0028] By adopting the above technical solution, the circular knife core shaft rotates and the blade rotates with it. Each time the blade rotates until it contacts the coating, an opening is completed. The spacing between each two adjacent groups of air inlets can be changed by changing the rotation speed of the circular knife core shaft to adapt to the processing of bathtub covers of different specifications and types.

[0029] The above-mentioned inflatable bathtub cover manufacturing machine can be further configured as follows: an extension frame is also installed on the frame, and the extension frame is distributed between the rubber band welding device and the airway stamping device.

[0030] By adopting the above technical solution, an extension frame is set between the rubber band welding device and the airway stamping device. After the rubber band is installed, the film is flattened to facilitate airway stamping and prevent the film from wrinkling.

[0031] The beneficial effects of the present invention are as follows: a new bathtub cover manufacturing machine is provided, which can process bathtub covers with at least double-layer coating and internal inflatable gas. When people use the bathtub cover, they will not come into direct contact with the bathtub. Instead, a gas layer is filled between the human body and the bathtub, thereby preventing babies, the elderly and other people from being injured. Compared with traditional bathtub covers, the bathtub cover is extremely comfortable to use and greatly improves the user experience.

[0032] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 Schematic diagram of the three-dimensional structure of an embodiment of the present invention;

[0034] Figure 2 is a schematic top view of an embodiment of the present invention;

[0035] Figure 3 for Figure 2 AA cross-section diagram;

[0036] Figure 4 Schematic diagram of the three-dimensional structure of the film unwinding device according to an embodiment of the present invention;

[0037] Figure 5 Schematic diagram of a roll changing mechanism according to an embodiment of the present invention;

[0038] Figure 6 for Figure 4 A partial enlarged schematic diagram of point B in the middle;

[0039] Figure 7 Schematic diagram of an airway opening mechanism according to an embodiment of the present invention;

[0040] Figure 8 Schematic diagram of a heat sealing mechanism according to an embodiment of the present invention;

[0041] Figure 9 Schematic cross-sectional view of a film unwinding device according to an embodiment of the present invention;

[0042] Figure 10 Schematic diagram of the overall structure of the airway imprinting device according to an embodiment of the present invention;

[0043] Figure 11 A schematic diagram of a printing roller according to an embodiment of the present invention;

[0044] Figure 12 A schematic diagram of a heat source assembly according to an embodiment of the present invention;

[0045] Figure 13 This is a schematic structural diagram of the left end portion of the airway imprinting device according to an embodiment of the present invention;

[0046] Figure 14 It is a front view schematic diagram of an airway imprinting device according to an embodiment of the present invention;

[0047] Figure 15 A schematic diagram of an extension frame according to an embodiment of the present invention;

[0048] Figure 16 This is a schematic diagram of a bathtub cover sample processed according to an embodiment of the present invention.

[0049] Label annotation: laminating unwinding device 1, rubber band welding device 2, longitudinal folding device 3, transverse welding device 4, cutting device 5, airway embossing device 6, airway opening mechanism 7, extension frame 8, unwinding roller 11, heating wheel shaft 12, heating wheel 13, roll changing mechanism 14, unwinding arm 141, roll changing cylinder 142, first bayonet 143, second bayonet 15, brake plate 16, movable bolt 17, printing roller 61, heat sealing traction roller 62, drive motor 63, heat source component 64, airway embossing pattern 65, slide rail 66, sliding block 67, pressure roller fixing block 68, pressure roller 69, handle 691, circular knife core shaft 71, blade 72. DETAILED DESCRIPTION

[0050] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0051] like Figures 1 to 15 The inflatable bathtub cover manufacturing machine shown includes a frame, on which are installed a film unwinding device 1, a rubber band welding device 2, a longitudinal folding device 3, a transverse welding device 4, and a cutting device 5 arranged in sequence along the effective transport direction. The frame is also provided with a traction roller group for delivering the material along the effective transport direction.

[0052] The film unwinding device 1 includes two sets of unwinding rollers 11 mounted on a frame and a heat-sealing mechanism capable of heat-sealing the two seams of the stacked materials. This allows for feeding two layers of film and heat-sealing the seams of the two layers. Compared to existing bathtub cover processing equipment, this provides a new bathtub cover manufacturing machine that can produce an inflatable bathtub cover with two layers of film. By providing at least two sets of unwinding rollers 11, at least two layers of film can be transported. Furthermore, a heat-sealing mechanism is added to heat-seal the seams of the two layers of film, integrating the two layers of film into one. An inflatable cavity exists between the two layers of film, assisting in the processing of an inflatable bathtub cover with at least two layers of film. Furthermore, the traction rollers are rationally arranged to transport the at least two layers of film, stacking them at the heat-sealing mechanism, facilitating the heat-sealing of the at least two layers of film.

[0053] The heat-sealing mechanism includes a heating wheel shaft 12 and two sets of heating wheels 13. The heating wheel shaft 12 is mounted on a frame perpendicular to the effective material transport direction. The two sets of heating wheels 13 are arranged in a sequential, spaced-apart arrangement along the axis of the heating wheel shaft 12 and mounted on the heating wheel shaft 12. This mechanism enables heat-sealing during transport, heat-sealing the seams of the two layers of film so that the two layers become one, with an inflatable cavity between them. This allows the manufacture of an inflatable bathtub cover having at least two layers of film.

[0054] A set of unwinding rollers 11 is linked to a reel-changing mechanism 14, comprising an unwinding arm 141 and a reel-changing cylinder 142. One end of the unwinding arm 141 is hinged to the machine frame, while the other end is hinged to the end of the reel-changing cylinder 142. The other end of the reel-changing cylinder 142 is hinged to the machine frame. The other end of the unwinding arm 141 is provided with a first latch 143 that is hinged to the unwinding rollers 11. This facilitates rewinding of the set of unwinding rollers 11 without stopping the machine. When the laminating film is finished, the reel-changing cylinder 142 pushes the unwinding arm 141 downward, allowing rewinding to proceed.

[0055] The frame is provided with a second latch 15 hingedly connected to the end of the other set of unwinding rollers 11. A brake plate 16 is provided above the second latch 15, and a swing bolt 17 is detachably connected to the end of the brake plate 16. This facilitates reel replacement for the other set of unwinding rollers 11 and allows for reel replacement without stopping the machine. Furthermore, the reel replacement structure, utilizing the second latch 15, brake plate 16, and swing bolt 17, is compact and space-saving, although the material must be lifted to a certain height during reel replacement.

[0056] The frame is also equipped with an air channel stamping device 6, which is distributed between the rubber band welding device 2 and the longitudinal folding device 3. The air channel of the inflatable bathtub cover can be processed, and gas is injected into the bathtub cover through the air channel to expand the bathtub cover. The air is separated from the bathtub and the human body, which can prevent babies, the elderly and other vulnerable people from getting hurt.

[0057] The air duct embossing device 6 includes a printing roller 61 and a heat-sealing traction roller 62. The axes of the printing roller 61 and the heat-sealing traction roller 62 are parallel to each other and are mounted on a frame in an opposite arrangement. The printing roller 61 is linked to a drive motor 63 and a heat source assembly 64. The surface of the printing roller 61 is provided with an air duct embossing pattern 65 protruding outward. The air duct embossing pattern 65 functions to form the air duct shape of the bathtub cover. The printing roller 61 and the heat-sealing traction roller 62 are further pressed together, and the printing roller 61 is heated by the heat source assembly 64 during this process, thereby achieving the processing of the air duct of the inflatable bathtub cover. The heat source assembly 64 can be a conductive ring or a carbon brush assembly. The printing roller 61 needs to be heated during the printing process. The heat source assembly 64 is used to connect to a power source, one of which is a thermocouple temperature output.

[0058] The frame is provided with a slide rail 66 distributed perpendicular to the effective transport direction. Sliding blocks 67 are hingedly connected at both ends of the printing roller 61. The sliding blocks 67 are slidably engaged with the slide rail 66. The sliding blocks 67 are detachably connected to a pressure roller fixing block 68 distributed above the sliding block 67. The pressure roller fixing block 68 is linked to a pressure roller 69 hinged to the frame. The pressure roller 69 is linked to a handle 691. The slide rail 66, the sliding block 67, the pressure roller fixing block 68, the pressure roller 69, and the handle 691 are arranged so that the printing roller 61 can float up and down along the axis of the slide rail 66. This not only allows the processing position to be adjusted according to the actual thickness of the processed material, but also facilitates the replacement of materials. When the handle 691 is shaken horizontally, the printing roller 61 leaves the traction roller and can be replaced at this time. When the handle 691 is vertically upward, the printing roller 61 is tightly combined with the heat-sealing traction roller 62 for printing.

[0059] The frame is also provided with an airway opening mechanism 7 which is distributed between the discharge roller 11 and the heat sealing mechanism and can open an air port for any set of films. An air inlet can be machined to facilitate subsequent inflation between the two layers of films.

[0060] The airway opening mechanism 7 comprises a circular blade spindle 71 mounted on a machine frame. A blade 72 is fixedly attached to the spindle 71, capable of creating air openings in any set of film. As the spindle 71 rotates, the blade 72 follows its rotation, completing an opening each time the blade 72 contacts the film. The spacing between adjacent sets of air inlets can be varied by changing the rotational speed of the spindle 71, accommodating the processing of bathtub covers of varying specifications and types.

[0061] The frame is also equipped with an extension frame 8, which is distributed between the rubber band welding device 2 and the airway stamping device 6. By arranging the extension frame 8 between the rubber band welding device 2 and the airway stamping device 6, the film can be flattened after the rubber band is installed, which facilitates airway stamping and prevents film wrinkles.

[0062] This specific embodiment has the following advantages:

[0063] (1) The invention realizes feeding of at least two layers of film and heat-sealing the seams of the two layers of film. Compared with the existing bathtub cover processing equipment, the invention provides a new bathtub cover manufacturing machine, which can process an inflatable bathtub cover with at least two layers of film.

[0064] (2) When the bathtub cover manufactured by the equipment provided by the present technical solution is used, air is inflated between each two adjacent layers of film, thereby forming an air layer between each two adjacent sets of film. When people use the bathtub cover, they do not come into direct contact with the bathtub. Instead, a gas layer is filled between the human body and the bathtub, thereby preventing babies, the elderly and other people from being injured. Compared with traditional bathtub covers, the bathtub cover is extremely comfortable to use and greatly improves the user experience.

[0065] In summary, this specific embodiment provides a new bathtub cover manufacturing machine, which can process bathtub covers with at least double-layer coating and internal inflatable. When people use this bathtub cover, they will not come into direct contact with the bathtub. Instead, a gas layer is filled between the human body and the bathtub, thereby preventing babies or the elderly from getting hurt. Compared with traditional bathtub covers, it is extremely comfortable to use and greatly improves the user experience.

[0066] Working principle: The two layers of film are transported, the airway opening mechanism 7 opens an air port in the upper layer of film, the hot air mechanism seals and welds the two sides of the two layers of film to form an inflatable cavity, and the film then passes through the rubber band welding device 2 for rubber band welding. After the rubber band welding is completed, the extension frame 8 flattens the film to prevent wrinkles, which is convenient for the subsequent airway stamping work, that is, the airway stamping device 6 processes the required airway, and the film then passes through the longitudinal folding device 3, the transverse welding device 4, and the cutting device 5 in sequence to obtain the required bathtub cover, as shown in the attached figure. Figure 16 Shown is a sample expansion diagram of an inflatable bathtub cover processed using this equipment.

Claims

1. An inflatable bathtub cover manufacturing machine, comprising a frame, on which are mounted a film unwinding device, a rubber band welding device, a longitudinal folding device, a transverse welding device, and a cutting device, arranged in sequence along an effective transport direction. The frame is also provided with a traction roller assembly for delivering the material along the effective transport direction, characterized in that: The laminating unwinding device includes at least two groups of unwinding rollers installed on the frame, and a heat sealing mechanism that can heat-seal the two seams of the materials after being stacked on each other. The frame is also equipped with an airway stamping device distributed between the rubber band welding device and the longitudinal folding device. The airway stamping device includes a printing roller and a heat sealing traction roller. The axes of the printing roller and the heat sealing traction roller are parallel to each other and are installed on the frame in an opposite manner. The printing roller is linked to a drive motor and a heat source component. The surface of the printing roller is provided with airway stamping lines protruding outward. The heat sealing mechanism includes a heating wheel shaft and several groups of heating wheels. The heating wheel shaft is installed on the frame perpendicular to the effective transportation direction of the material. Several groups of heating wheels are arranged in sequence along the axis direction of the heating wheel shaft and are installed on the heating wheel shaft.

2. The inflatable bathtub cover manufacturing machine according to claim 1, characterized in that: The frame is provided with a slide rail distributed perpendicular to the effective transport direction, and the two ends of the printing roller are respectively hingedly linked with sliding blocks, the sliding blocks are slidably matched with the slide rails, the sliding blocks are detachably connected to the pressure roller fixing blocks distributed above the sliding blocks, the pressure roller fixing blocks are linked to the pressure roller hinged on the frame, and the pressure roller is linked with a handle.

3. The inflatable bathtub cover manufacturing machine according to claim 1, characterized in that: A group of unwinding rollers are linked to a roll-changing mechanism, which includes an unwinding arm and a roll-changing cylinder. One end of the unwinding arm is hinged to the frame, and the other end is hinged to the end of the roll-changing cylinder. The other end of the roll-changing cylinder is hinged to the frame, and the other end of the unwinding arm is provided with a first bayonet hinged to the unwinding roller.

4. The inflatable bathtub cover manufacturing machine according to claim 3, characterized in that: The frame is provided with a second bayonet hinged to the end of another group of unloading rollers, a brake plate is provided above the second bayonet, and the end of the brake plate is detachably connected with a movable bolt.

5. The inflatable bathtub cover manufacturing machine according to any one of claims 1 to 4, characterized in that: The frame is also provided with an airway opening mechanism which is distributed between the unwinding roller and the heat sealing mechanism and can open an air port for any group of films.

6. The inflatable bathtub cover manufacturing machine according to claim 5, characterized in that: The airway opening mechanism comprises a circular knife core shaft mounted on a machine frame, and a blade capable of opening an air port for any group of films is relatively fixedly connected to the circular knife core shaft.

7. The inflatable bathtub cover manufacturing machine according to claim 1 or 2, characterized in that: An extension frame is also installed on the frame, and the extension frame is distributed between the rubber band welding device and the airway stamping device.

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