Ultrasonic flip welding device for pull-up pants

Abstract

The present invention relates to the field of disposable sanitary product production equipment, and specifically to a pull-up pants ultrasonic flip welding device, comprising a frame, a rotating shaft and an ultrasonic welding mechanism are mounted on the frame, the ultrasonic welding mechanism comprises a welding machine body and a pressing plate, the materials to be welded are arranged and transported in an assembly line, when the pressing plate contacts the welding machine body, the materials to be welded are sandwiched between the pressing plate and the welding machine body, the frame is provided with a flip mechanism for driving the pressing plate to approach / move away from the welding machine body, the flip mechanism comprises a groove wheel, a rotating frame, a guide rail, a slider and a connecting rod mechanism, the circumferential outer surface of the groove wheel is provided with a guide groove, the lower end of the slider is provided with a guide rod embedded in the guide groove so that the slider can be displaced as the position of the guide rod changes. The present invention is applied to the welding process of waist circumference and other positions in the production of sanitary products.

Description

Technical Field

[0001] The invention relates to the field of production equipment for disposable sanitary products such as adult diaper machines, mattresses, sanitary napkins, and more specifically to an ultrasonic flip welding device for pull-up pants, and in particular to the production of baby pull-up pants and adult pull-up pants. Background Art

[0002] At present, in the relevant disposable sanitary products equipment in China, especially in the pull-up pants machinery, waist welding is an important standard of product quality and one of the factors affecting the machine startup speed. However, the traditional design has the following problems:

[0003] 1. Traditional waist welding is achieved by heat sealing. This mechanism has great limitations. First, for the welding effect, the welding force between the upper and lower rollers is large, which leads to the instability of the mechanism and great vibration when the machine is started, especially when the equipment is running at high speed, which will increase the noise and vibration of the whole machine. Secondly, the upper and lower rollers need to be heated during heat sealing. For the welding effect, the temperature and power are high, and the consumption of the heating rod is also large. At the same time, due to the existence of heating wires and temperature control wires, a rotary connector is required. Due to the limitation of the installation accuracy of the rollers and the rotary connector, as well as the vibration of the mechanism, the rotary connector is easily damaged. Finally, due to the limitation of the mechanism itself, under the premise of pursuing welding strength, it is easy to cause over-welding of the product at high speed, resulting in material welding failure, which cannot meet the requirements of high-speed start-up.

[0004] 2. Considering the limitations of heat sealing, ultrasonic welding is also used in the subsequent design. Ultrasonic welding has less vibration than heat sealing, and the welding effect is also better than heat sealing. The welding position is soft, unlike heat sealing, which produces a certain hardness.

[0005] The current ultrasonic welding structure is to replace the upper roller of the original heat sealing mechanism with a flat ultrasonic welding one. The ultrasonic welding effect requires different welding forces or spacings at different machine speeds, which cannot be achieved by ordinary ultrasonic mechanisms. When ultrasonic mechanisms with adjustable welding forces are used, the price-performance ratio is not high due to their high prices. At the same time, although the welding effect can be improved by adjusting the welding force, there is a minimum welding time for ultrasonic waves to meet the welding requirements. As the machine speed continues to increase, the welding time will be reduced accordingly. The production speed of the equipment is restricted by the welding time, and there are also limitations.

[0006] 3. Whether it is a heat sealing mechanism or the above-mentioned ultrasonic mechanism, there is a problem at the same time, that is, since the welding surface is a round surface, there is only one line during welding. For different product widths and different machine speeds, it is impossible to guarantee a stable welding time at the welding position, and thus the welding effect cannot be guaranteed. Summary of the invention

[0007] Therefore, the present invention provides an ultrasonic flip welding device for pull-up pants, which solves the problem that the welding effect of the welding equipment used in pull-up pants is poor.

[0008] To achieve the above object, the present invention is achieved through the following technical solutions:

[0009] A pull-up pants ultrasonic flip welding device comprises a frame, on which a rotating shaft and an ultrasonic welding mechanism are mounted, the ultrasonic welding mechanism comprises a welding machine body and a pressing plate, the materials to be welded are conveyed in an assembly line arrangement, when the pressing plate contacts the welding machine body, the materials to be welded are clamped between the pressing plate and the welding machine body, the frame is provided with a flipping mechanism for driving the pressing plate to approach / move away from the welding machine body, the flipping mechanism comprises a groove wheel fixed on the frame, a rotating frame located outside the groove wheel and mounted on the rotating shaft and capable of rotating with the rotating shaft, a guide rail mounted on the rotating frame, a slider capable of reciprocating on the guide rail, and a connecting rod mechanism for mounting the pressing plate so that the pressing plate can complete the flipping action as the slider slides, the circumferential outer surface of the groove wheel is provided with a guide groove, the lower end of the slider is provided with a guide rod embedded in the guide groove so that the slider can be displaced as the position of the guide rod changes.

[0010] Preferably, the connecting rod mechanism is provided with a pressure cylinder for installing a pressure plate, the pressure plate is inserted into the bottom of the pressure cylinder, the contact surface between the pressure plate and the welding machine body is exposed outside the pressure cylinder, and an air bag for applying force to the pressure plate is embedded in the pressure cylinder.

[0011] Preferably, the guide groove on the groove wheel is divided into a guide section and a welding section. When the guide rod is in the welding section, the ultrasonic welding mechanism welds the material. The welding section is not less than 1 / 8 of the diameter of the groove wheel.

[0012] Preferably, the connecting rod mechanism includes a first connecting rod and a second connecting rod, one end of the first connecting rod is hinged on the rotating frame, and its position is close to the welding machine body, and the other end is hinged to the second connecting rod, and the free end of the second connecting rod is hinged on the slider, and the pressure cylinder is installed on the first connecting rod. When the slider slides in the direction close to the welding machine body, the pressure plate at the lower end of the pressure cylinder gradually flips toward the direction of the welding machine body with the movement of the pressure cylinder until the two are in contact with each other.

[0013] Preferably, the projection shape of the guide groove along the conveying direction of the assembly line is a centrally symmetrical arc structure. When the guide rod is at the end of the arc, it is a non-welding position and a welding position, respectively, forming a structure in which welding is performed once the shaft rotates one circle.

[0014] Preferably, the projection shape of the guide groove along the conveying direction of the assembly line is an axisymmetric arc structure, and when the guide rod is at the end of the arc, it is in the welding position, forming a structure in which the shaft rotates one circle and welds twice.

[0015] Preferably, a guide roller arranged parallel to the rotating shaft is provided on the frame located on the radial circumferential side of the groove wheel, and the material is wound around the outer surface of the guide roller and welded twice.

[0016] This is another technical solution of the present application, a pull-up pants ultrasonic flip welding device, comprising a frame, a rotating shaft and an ultrasonic welding mechanism are mounted on the frame, the ultrasonic welding mechanism comprises a welding machine body and a pressing plate, the materials to be welded are arranged and transported in an assembly line, when the pressing plate contacts the welding machine body, the materials to be welded are clamped between the pressing plate and the welding machine body, the frame is provided with a flipping mechanism for driving the pressing plate to approach / move away from the welding machine body, the flipping mechanism comprises a groove wheel mounted on the rotating shaft and capable of rotating with the rotating shaft, a fixed frame located on the frame outside the groove wheel, a guide rail mounted on the fixed frame, a slider capable of reciprocating on the guide rail, and a connecting rod mechanism for mounting the pressing plate so that the pressing plate can complete the flipping action with the sliding of the slider, the circumferential outer surface of the groove wheel is provided with a guide groove, the lower end of the slider is provided with a guide rod embedded in the guide groove so that the slider can be displaced as the position of the guide rod changes.

[0017] Preferably, the connecting rod mechanism is provided with a pressure cylinder for installing a pressure plate, the pressure plate is inserted into the bottom of the pressure cylinder, the contact surface between the pressure plate and the welding machine body is exposed outside the pressure cylinder, and an air bag for applying force to the pressure plate is embedded in the pressure cylinder.

[0018] Preferably, the guide groove on the groove wheel is divided into a guide section and a welding section. When the guide rod is in the welding section, the ultrasonic welding mechanism welds the material. The welding section is not less than 1 / 8 of the diameter of the groove wheel.

[0019] By adopting the above technical solution, the beneficial effects of the present invention are:

[0020] This technical solution uses ultrasonic welding to ensure the welding effect. At the same time, the material at the welding point is soft, the welding strength can be guaranteed, and the welding quality is improved;

[0021] Through the designed pressing method of the pressing plate and the welding machine body, the design of the groove wheel angle can ensure the welding time through calculation, thereby meeting the minimum ultrasonic welding time and ensuring the welding effect;

[0022] Due to the pressing method adopted, the welding position is a plane. During the whole welding process, the overall force at the welding point can be achieved, and the welding effect is uniform;

[0023] When welding, an air bag is used. By controlling the air pressure of the air bag, the force on the pressure plate can be adjusted, and then the welding force can be adjusted. At the same time, the welding block can be evenly attached to the ultrasonic welding surface under the action of the air bag to ensure the welding effect.

[0024] This technical solution can ensure the welding effect, increase the production speed of the machine and improve the welding quality, meet the use requirements of different models of products, and improve the production efficiency of the machine;

[0025] At the same time, the technical solution is independent of the traditional welding equipment used for sanitary products. It is suspended outside the traditional assembly line and can improve the old production equipment according to demand. The transformation investment is low and it has good versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

[0027] Figure 2 This is a schematic diagram of a partially enlarged structure of location A of Embodiment 1 of the present invention;

[0028] Figure 3 This is a schematic diagram of the structure of a sheave according to an embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of the structure of a sheave according to a second embodiment of the present invention;

[0030] Figure 5 This is a schematic diagram of the position structure of the guide roller and the ultrasonic welding mechanism in the third embodiment of the present invention;

[0031] Figure 6 It is a schematic diagram of the overall structure of the fourth embodiment of the present invention. DETAILED DESCRIPTION

[0032] The following will describe the implementation methods of the present invention in detail in conjunction with specific embodiments, so that the implementation process of how the present invention applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0033] Embodiment 1

[0034] refer to Figure 1 and Figure 2A pull-up pants ultrasonic flip welding device includes a frame 100, on which a rotating shaft 1 and an ultrasonic welding mechanism 2 are mounted, the rotating shaft 1 is connected to a motor driving the rotating shaft 1, the ultrasonic welding mechanism 2 includes a welding machine body 21 and a pressing plate 22, the materials to be welded are arranged and transported in an assembly line, when the pressing plate 22 contacts the welding machine body 21, the materials to be welded are sandwiched between the pressing plate 22 and the welding machine body 21, the frame 100 is provided with a flip mechanism 3 for driving the pressing plate 22 to approach / move away from the welding machine body 21, the flip mechanism The mechanism 3 includes a groove wheel 31 fixed on the frame 100, a rotating frame 32 located outside the groove wheel 31 and mounted on the rotating shaft and can rotate with the rotating shaft 1, a guide rail 33 mounted on the rotating frame 32, a slider 34 that can reciprocate on the guide rail 33, and a connecting rod mechanism 4 for mounting the pressing plate 22 so that the pressing plate 22 can complete the flipping action with the sliding of the slider 34. The outer surface of the groove wheel 31 is provided with a guide groove 311, and the lower end of the slider 34 is provided with a guide rod 341 embedded in the guide groove 311 so that the slider 34 can move with the position change of the guide rod 341. When the equipment is running, the rotating shaft 1 rotates to drive the rotating frame 32 to rotate, and the guide rod 341 realizes movement around the outer surface of the groove wheel 31 in the guide groove 311, thereby driving the slider 34 to realize a fixed period of reciprocating motion on the guide rail 33 (the period is one rotation of the rotating shaft 1), thereby driving the connecting rod mechanism to realize a reciprocating motion, and performing a welding action of the pressing plate 22 and the welding machine body 21 and resetting. This pressing structure is different from the two-roll hot pressing or ultrasonic rolling structure, and can achieve surface welding. Different from the line welding structure, it can ensure the overall force of the welding position and improve the welding effect. At the same time, surface welding can also ensure that the welding time is sufficient, thereby meeting the minimum welding time of ultrasonic welding and ensuring the welding effect.

[0035] Specifically, the connecting rod mechanism 4 is provided with a pressing cylinder 5 for installing a pressing plate, the pressing plate 22 is inserted into the bottom of the pressing cylinder 5, the contact surface between the pressing plate 22 and the welding machine body 21 is exposed outside the pressing cylinder 5, and an air bag 23 for applying force to the pressing plate 22 is embedded in the pressing cylinder 5. The pressing cylinder 5 is provided with the air bag 23, and by controlling the air pressure inside the air bag 23, force can be directly applied to the non-welding surface of the pressing plate 22. The welding force can be adjusted by adjusting the air pressure, and the adjustment method is simple. In addition, the pressurization of the air bag 23 can make the force on the pressing plate 22 more uniform, further ensuring the welding effect.

[0036] Specifically, the connecting rod mechanism 4 includes a first connecting rod 41 and a second connecting rod 42. One end of the first connecting rod 41 is hinged on the rotating frame 32, and its position is close to the welding machine body 21. The other end is hinged to the second connecting rod 42. The free end of the second connecting rod 42 is hinged on the slider 34. The pressing cylinder 5 is installed on the first connecting rod 41. When the slider 34 slides in the direction close to the welding machine body 21, the pressing plate 22 at the lower end of the pressing cylinder 5 gradually flips toward the direction of the welding machine body 21 with the movement of the pressing cylinder 5 until the two are in contact with each other. A specific structure of the connecting rod mechanism 4 is shown here. When the code needs to be changed, the position of the pressing cylinder 5 on the first connecting rod 41 can be directly changed, or the length of the second connecting rod and the first connecting rod can be adjusted, or the connection position between the first connecting rod and the first connecting rod can be adjusted, so that the turning radius of the turning mechanism can be changed, and then the code can be directly changed for the production products with different needs. The code can be changed directly online, which can meet the welding production requirements of products of different models, and the disassembly of the internal structure is eliminated, and the adjustment is convenient; through the design of this connecting rod mechanism 4, the structure can be improved according to the needs, and the turning route of the turning mechanism 3 can be changed, so as to meet the welding requirements of products of different models, and the adjustment is convenient, and the disassembly of the mechanism will not be involved, and the code change operation can be performed online;

[0037] In this embodiment, the guide groove 311 on the groove wheel 31 is divided into a guide section 311a and a welding section 311b. When the guide rod 341 is in the welding section, the ultrasonic welding mechanism 2 welds the material. The welding section 311b is 1 / 3 of the diameter of the groove wheel 31. Since the guide groove 311 is an arc structure, the guide 311 is designed here. Specifically, the projection shape of the guide groove 311 along the conveying direction of the assembly line is a centrally symmetrical arc structure. When the guide rod 341 is at the end of the arc, it is a non-welding position a and a welding position b, respectively, forming a structure in which the rotating shaft 1 rotates one circle and performs one welding. The distribution of the welding section 311b is as follows: Figure 3 As shown, located at the lower part of the groove wheel 31, when the guide rod 341 gradually moves, there will be a time period of gradual contact and compaction and then separation between the pressing plate 22 and the welding machine body 21. During this time period, the proportion of the welding section 311b to the circular diameter of the groove wheel 31 can be adjusted to achieve the function of adjusting the welding time, thereby ensuring that the welding time meets the minimum welding time of ultrasonic welding. In combination with the surface contact structure of the pressing plate 22 and the welding machine body 21, the technical solution can have a stable and good welding effect.

[0038] At the same time, when the product is welded, since only the waistline is welded and the core is outside the welding position, the core can be clamped with a belt. Compared with the hot pressing welding structure with two pressure rollers, it can avoid the instability of the product during welding due to the thickness of the core.

[0039] Embodiment 2

[0040] refer to Figure 4 Compared with the first embodiment, the projection shape of the guide groove 311 along the conveying direction of the assembly line is an axisymmetric arc structure. When the guide rod 341 is at the end of the arc, it is at the welding position b, forming a structure in which the shaft rotates one circle and welds twice. This is an improvement made according to the demand, which can complete the function of welding twice by rotating the shaft 1 one circle. Figure 4 As shown, the upper and lower ends of the guide rod 311 along the groove wheel 31 are both welding sections 311b, the middle part is the guide section 311a, and the upper and lower ends of the equipment are both welding positions b, which can be used for one welding machine to weld two material conveying lines, and can further improve production efficiency.

[0041] Embodiment 3

[0042] refer to Figure 5 Compared with the second embodiment, a guide roller 6 arranged parallel to the rotating shaft 1 is provided on the frame located on the radial circumferential side of the groove wheel 31, and the material is wound around the outer surface of the guide roller for two weldings. In this structure, the guide roller 6 is designed to guide the material of the assembly line from the welding position b at the lower end to the welding position b at the upper end through the guide roller 6. The structure can set the two welding positions b to act simultaneously or intermittently or one of the welding positions b is for supplementary welding according to actual needs, so that the technical solution can have a more flexible scope of use and adapt to the needs of welding of more diverse products.

[0043] Embodiment 4

[0044] This is another technical solution of this application. Figure 6 As shown, an ultrasonic flip welding device for pull-up pants includes a frame 100, on which a rotating shaft 1 and an ultrasonic welding mechanism 2 are mounted, and the ultrasonic welding mechanism 2 includes a welding machine body 21 and a pressing plate 22. The materials to be welded are arranged and transported in an assembly line. When the pressing plate 22 contacts the welding machine body 21, the materials to be welded are clamped between the pressing plate 22 and the welding machine body 21. The frame 100 is provided with a flip mechanism 3 for driving the pressing plate 22 to approach / move away from the welding machine body 21. The flip mechanism 3 It includes a groove wheel 31 installed on the rotating shaft 1 and can rotate with the rotating shaft 1, a fixing frame 32 located on the frame outside the groove wheel 31, a guide rail 33 installed on the fixing frame 32, a slider 34 that can reciprocate on the guide rail 33, and a connecting rod mechanism 4 for installing the pressure plate 22 so that the pressure plate 22 can complete the flipping action with the sliding of the slider 34. The circumferential outer surface of the groove wheel 31 is provided with a guide groove 311, and the lower end of the slider 34 is provided with a guide rod 341 embedded in the guide groove 311 so that the slider can move as the position of the guide rod 341 changes.

[0045] In this embodiment, a pressure cylinder 5 for installing a pressure plate 22 is provided on the connecting rod mechanism 4. The pressure plate 22 is inserted into the bottom of the pressure cylinder 5. The contact surface between the pressure plate 22 and the welding machine body 21 is exposed outside the pressure cylinder 5. An air bag 23 for applying force to the pressure plate 22 is embedded in the pressure cylinder 5.

[0046] In this embodiment, the guide groove 311 on the groove wheel 31 is divided into a guide section 311a and a welding section 311b, and the positions of the non-welding position a and the welding position b are shown. When the guide rod 341 is in the welding section 311b, the ultrasonic welding mechanism 2 welds the material. The welding section 311b is 1 / 3 of the circular diameter of the groove wheel 31. Here, according to the actual welding time required, the length of the welding section 311b can also be shortened, and the minimum must not be less than 1 / 8 of the circular diameter of the groove wheel 31.

[0047] In the present technical solution, compared with the first embodiment, the rotating part is a groove wheel 31, and the position of the welding machine body 21 is fixed, which can facilitate installation. Also, since the position of the fixing frame 32 is fixed, it can be easy to install and reduce the installation accuracy requirements. Moreover, when adjusting, only the groove wheel 31 needs to be adjusted, which improves the convenience of equipment installation.

[0048] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. An ultrasonic flip welding device for pull-up pants, characterized in that: It includes a frame, on which a rotating shaft and an ultrasonic welding mechanism are mounted, the ultrasonic welding mechanism includes a welding machine body and a pressing plate, the materials to be welded are arranged and transported in an assembly line, when the pressing plate contacts the welding machine body, the materials to be welded are clamped between the pressing plate and the welding machine body, the frame is provided with a flipping mechanism for driving the pressing plate to approach / move away from the welding machine body, the flipping mechanism includes a groove wheel fixed on the frame, a rotating frame located outside the groove wheel and mounted on the rotating shaft and can rotate with the rotating shaft, a guide rail mounted on the rotating frame, a slider that can reciprocate on the guide rail, and a connecting rod mechanism for mounting the pressing plate so that the pressing plate can complete the flipping action with the sliding of the slider, the circumferential outer surface of the groove wheel is provided with a guide groove, the lower end of the slider is provided with a guide rod embedded in the guide groove so that the slider can be displaced as the position of the guide rod changes.

2. The ultrasonic flip welding device for pull-up pants according to claim 1 is characterized in that: The connecting rod mechanism is provided with a pressure cylinder for installing a pressure plate, the pressure plate is inserted into the bottom of the pressure cylinder, the contact surface between the pressure plate and the welding machine body is exposed outside the pressure cylinder, and an air bag for applying force to the pressure plate is embedded in the pressure cylinder.

3. The ultrasonic flip welding device for pull-up pants according to claim 2 is characterized in that: The guide groove on the groove wheel is divided into a guide section and a welding section. When the guide rod is in the welding section, the ultrasonic welding mechanism welds the material. The welding section is not less than 1 / 8 of the diameter of the groove wheel.

4. The ultrasonic flip welding device for pull-up pants according to claim 1, 2 or 3, characterized in that: The connecting rod mechanism includes a first connecting rod and a second connecting rod, one end of the first connecting rod is hinged on the rotating frame, and its position is close to the welding machine body, and the other end is hinged to the second connecting rod, and the free end of the second connecting rod is hinged on the slider, and the pressure cylinder is installed on the first connecting rod. When the slider slides in the direction close to the welding machine body, the pressure plate at the lower end of the pressure cylinder gradually flips toward the direction of the welding machine body with the movement of the pressure cylinder until the two contact each other.

5. The ultrasonic flip welding device for pull-up pants according to claim 1, 2 or 3, characterized in that: The projection shape of the guide groove along the conveying direction of the assembly line is a centrally symmetrical arc structure. When the guide rod is at the end of the arc, it is a non-welding position and a welding position, respectively, forming a structure in which welding is performed once the shaft rotates one circle.

6. The ultrasonic flip welding device for pull-up pants according to claim 1, 2 or 3, characterized in that: The projection shape of the guide groove along the conveying direction of the assembly line is an axisymmetric arc structure. When the guide rod is at the end of the arc, it is in the welding position, forming a structure in which the shaft rotates one circle and welds twice.

7. The ultrasonic flip welding device for pull-up pants according to claim 6, characterized in that: A guide roller arranged parallel to the rotating shaft is arranged on the frame located at the radial circumferential side of the groove wheel, and the material is wound around the outer surface of the guide roller for two weldings.

8. An ultrasonic flip welding device for pull-up pants, characterized in that: It includes a frame, on which a rotating shaft and an ultrasonic welding mechanism are mounted, the ultrasonic welding mechanism includes a welding machine body and a pressing plate, the materials to be welded are arranged and transported in an assembly line, when the pressing plate contacts the welding machine body, the materials to be welded are clamped between the pressing plate and the welding machine body, the frame is provided with a flipping mechanism for driving the pressing plate to approach / move away from the welding machine body, the flipping mechanism includes a groove wheel mounted on the rotating shaft and capable of rotating with the rotating shaft, a fixing frame located on the frame outside the groove wheel, a guide rail mounted on the fixing frame, a slider that can reciprocate on the guide rail, and a connecting rod mechanism for mounting the pressing plate so that the pressing plate can complete the flipping action with the sliding of the slider, the circumferential outer surface of the groove wheel is provided with a guide groove, the lower end of the slider is provided with a guide rod embedded in the guide groove so that the slider can be displaced with the position change of the guide rod.

9. The ultrasonic flip welding device for pull-up pants according to claim 8, characterized in that: The connecting rod mechanism is provided with a pressure cylinder for installing a pressure plate, the pressure plate is inserted into the bottom of the pressure cylinder, the contact surface between the pressure plate and the welding machine body is exposed outside the pressure cylinder, and an air bag for applying force to the pressure plate is embedded in the pressure cylinder.

10. The ultrasonic flip welding device for pull-up pants according to claim 9, characterized in that: The guide groove on the groove wheel is divided into a guide section and a welding section. When the guide rod is in the welding section, the ultrasonic welding mechanism welds the material. The welding section is not less than 1 / 8 of the diameter of the groove wheel.

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