Welding device for anti-leakage paper cup

Abstract

The present invention provides a welding device for an anti-leakage paper cup, and belongs to the field of mechanical technology. It solves the technical problem that the yield of existing anti-leakage paper cups is low. The welding device for an anti-leakage paper cup includes a welding seat for placing cup paper sheets and a welding head that can be raised and lowered relative to the welding seat. The welding seat is columnar and horizontally arranged. The welding head is located above the welding seat. A first welding surface is arranged on the columnar surface of the welding seat, and a second welding surface that forms a downward pressure fit with the first welding surface is arranged on the bottom surface of the welding head. At least one of the two welding surfaces is a stepped surface, and the other is a plane or a stepped surface. The stepped surface includes a first stepped plane and a second stepped plane protruding from the first stepped plane. By arranging a stepped surface on the welding seat or the welding head, the height difference of the seam part of the anti-leakage paper cup is reduced, and the plastic film is directly melted and bonded by the welding head, so that the thickness of the seam part after welding tends to be flat, and the yield is greatly improved.

Description

Technical Field

[0001] The invention belongs to the field of mechanical technology and relates to a welding device for a paper-plastic composite material, in particular to a welding device for an anti-leakage paper cup. Background Art

[0002] Paper cups are disposable containers that are widely used. They are made of a cylindrical paper cup wall bonded to a bottom. The cylindrical cup wall is formed by bending and connecting fan-shaped paper sheets, which overlap at the seam and are fixed by glue. In order to prevent water from soaking the paper cup wall, a layer of plastic film is covered on one side of the fan-shaped paper. When curling, the side with the plastic film is used as the inner wall of the paper cup wall, and the seam is overlapped. The plastic film and the outer side of the paper at the overlap are bonded by glue. Paper cups made by this bonding method will leak the cross section of the paper at the seam, and the cross section is inside the paper cup, so water will still soak the paper on the wall of the paper cup through the cross section.

[0003] The solution is to add a gluing process at the paper section to seal the paper section with glue. However, it is difficult to design automatic gluing when gluing on the inner side of the formed cylinder.

[0004] Another solution is to adopt an oil-proof and leak-proof paper container solution previously proposed by the applicant, see Chinese Patent No. 201820762473.9. In this solution, the plastic film on the inner side of the paper cup wall is extended to a portion of the paper cross section, and the extended plastic film is bonded to the plastic film on the inner wall of the paper cup wall. In this way, the paper cut is sealed and isolated outside the plastic film.

[0005] After searching the prior art, no such device was found. The reason may be that when paper cups with this structure are connected and fixed, it is difficult to connect and fix them automatically through existing equipment because the extended plastic film is on the inner side of the paper cup and the plastic film is thin and soft, while manual manufacturing is too inefficient. Summary of the invention

[0006] In view of the above problems existing in the prior art, the present invention provides a welding device for a leakage-proof paper cup, which is used to solve the problems of cup wall connection efficiency and yield rate of the leakage-proof paper cup.

[0007] The present invention is achieved through the following technical solutions: a welding device for leak-proof paper cups, comprising a welding seat for placing paper cup wallpaper and a welding head that can be raised and lowered relative to the welding seat, characterized in that the welding seat is columnar and horizontally arranged, the welding head is located above the welding seat, a first welding surface is provided on the columnar surface of the welding seat, a second welding surface is provided on the bottom surface of the welding head to form a downward press fit with the first welding surface, at least one of the first welding surface and the second welding surface is a stepped surface, the other of the first welding surface and the second welding surface is a plane or a stepped surface, and the stepped surface includes a first stepped plane and a second stepped plane protruding from the first stepped plane.

[0008] When making paper cups, the fan-shaped paper with extended plastic film is wrapped on a columnar welding seat. After wrapping, the two sections of the fan-shaped paper overlap each other, wherein the extended plastic film is located on the first step plane, and the section of the fan-shaped paper with the extended plastic film is located on the second step plane. After the other section of the fan-shaped paper overlaps, it covers the section of the fan-shaped paper with the extended plastic film, so that the four-layer structure formed by the overlapping part of the paper section is located on the second step plane, and the height is reduced. The three-layer structure formed by the extended plastic film and the paper section above it is located on the first step plane. In this way, the height difference is eliminated in the joint part of the leakage-proof paper cup. When welding, the plastic film can be directly melted to bond the joint part, and no welding damage will be caused by the height difference. In addition to the above-mentioned setting of the step surface on the welding seat, the same effect can be achieved by setting the step surface on the welding head. That is, the four-layer structure formed by the overlapping part of the paper section is located above and below the first step plane, and the three-layer structure formed by the extended plastic film and the paper section above it is located above and below the second step plane.

[0009] In the above-mentioned welding device for leak-proof paper cups, the first welding surface is a plane and the second welding surface is a stepped surface; or the first welding surface is a stepped surface and the second welding surface is a plane; or the first welding surface is a stepped surface and the second welding surface is a stepped surface, and the stepped surface of the first welding surface and the stepped surface of the second welding surface are staggered so that the two stepped surfaces can fit together.

[0010] In the above-mentioned anti-leakage paper cup welding device, the step surface also includes a step vertical surface, which connects and is perpendicular to the first step plane and the second step plane, and the length direction of the step vertical surface is inclined or parallel to the axial direction of the columnar seat. The inclined setting of the step vertical surface can leave a space for making way, so that the seam of the asymmetric fan-shaped cup wallpaper can be placed flat.

[0011] In the above-mentioned welding device for leak-proof paper cups, the welding seat comprises a cylindrical seat body with a circular or elliptical cross section and a receiving rod connected to the seat body for receiving the welded paper cup paper. A conical outer peripheral surface with a taper is formed along the axial direction of the cylindrical seat body, and the first welding surface is located on the upper side of the conical outer peripheral surface. The conical peripheral surface is made according to the shape of the paper cup, and the welding surface is set on the upper side, so that when the cross sections of the fan-shaped paper overlap, they can be laid flat under the action of gravity, especially the extended plastic film can be laid flat under the action of gravity without wrinkles, folds or bends.

[0012] In the welding device for the anti-leakage paper cup, the welding head comprises a long strip bottom surface matching the length of the columnar seat and a heater for heating the long strip bottom surface, and the long strip bottom surface forms a second welding surface. By heating the long strip bottom surface of the welding head with the heater, the welding can be concentrated on the seam portion without affecting other plastic films.

[0013] In the above-mentioned welding device for leak-proof paper cups, the welding device includes a base and a lifting frame arranged above the base, the lifting frame is connected to the base through a guide column, and the lifting frame is driven up and down by a power source, the welding head is connected to the lifting frame, and the welding seat is fixed on the base.

[0014] In the welding device for the anti-leakage paper cup, the welding device includes a pair of clamping arms, and the welding seat is arranged between the clamping arms. Each clamping arm includes a rotating rod and a pressing plate with a notch fixed to the rotating rod, and the shape of the notch matches the outer peripheral surface of the welding seat. The fan-shaped paper is pressed against the welding seat by the pressing plate, and the seam parts are folded in order. The process is that the clamping arms on both sides push the fan-shaped paper to move toward the welding seat together, and the clamping arm on one side clamps first, and the clamping arm on the other side clamps later. The structure can be set at two different angles so that the two clamping arms clamp successively under equal speed conditions, or different speeds can be used. The notch structure can ensure that the clamping is firm and does not shift.

[0015] In the welding device for the anti-leakage paper cup, the cross section of the welding seat is waist-shaped. When the notch of one pressing plate covers the left side of the outer peripheral surface of the welding seat, the upper end of the pressing plate is located on the second step plane. When the notch of the other pressing plate covers the right side of the outer peripheral surface of the welding seat, the upper end of the pressing plate is located on the first step plane. The waist-shaped welding seat can make the welding surface larger, and the bending angle between the welding surface and the side surface larger. When the fan-shaped paper is pressed to the welding surface by the upper end of the pressing plate, the overlapping part of the fan-shaped paper can be formed into a straight state, which is conducive to extending the flatness of the plastic film part. When welding, it can ensure the flatness of each layer of paper after the welding head is pressed down, and improve the yield rate.

[0016] Compared with the prior art, the welding device for the anti-leakage paper cup has the following advantages:

[0017] 1. It can realize automatic manufacturing. After the conveying device conveys the fan-shaped paper, the clamping arm pushes the fan-shaped paper to rise and bend, and clamps it on the welding seat. After clamping, the power source drives the welding head to move down, and the welding seat cooperates to automatically weld the joint part of the fan-shaped paper to make a leak-proof paper cup wall with high efficiency.

[0018] 2. By setting a stepped surface on the welding seat or welding head, the height difference of the seam part of the anti-leakage paper cup is reduced, and the plastic film is directly melted and bonded through the welding head, so that the thickness of the seam part after welding tends to be flat, and the yield rate is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional structural schematic diagram of the welding device of the anti-leakage paper cup.

[0020] Figure 2 It is a structural schematic diagram of the welding device of the anti-leakage paper cup when the clamping arm is not clamped.

[0021] Figure 3 It is a structural schematic diagram of the welding device of the leakage-proof paper cup when the clamping arm is clamping.

[0022] Figure 4 The figure is a schematic diagram of the structure of the welding device for leak-proof paper cups after being clamped and welded by the clamping arms.

[0023] Figure 5 It is a three-dimensional structural schematic diagram of a welding seat of a welding device for a leakage-proof paper cup in the first embodiment.

[0024] Figure 6 Is adopted Figure 5 Schematic diagram of the state structure of the welding seat during welding.

[0025] Figure 7 It is a three-dimensional structural schematic diagram of a welding seat of a welding device for a leakage-proof paper cup in the second embodiment.

[0026] Figure 8 Is adopted Figure 7 A schematic diagram of the structure of the welding seat when it is not pressed down during welding.

[0027] Fig. 9 yes Figure 8 Schematic diagram of the structure for welding in the downward pressure state.

[0028] Fig.10 It is a structural schematic diagram of the clamping arm clamping the waist-shaped seat body of the welding seat for welding in the third embodiment.

[0029] Fig.11 It is a schematic diagram of the structure of a fan-shaped cup wallpaper sheet before cutting.

[0030] Fig.12 It is a three-dimensional structural schematic diagram of the welding seat and welding head of the fourth embodiment.

[0031] Fig.13 It is a schematic diagram of the structure of the welding seat and the welding head when welding is performed in the fifth embodiment.

[0032] In the figure, 1, welding seat; 11, columnar seat body; 12, receiving rod; 13, first welding surface; 2, welding head; 21, second welding surface; 3, first step plane; 4, second step plane; 10, step vertical surface; 5, base; 51, opening; 6, lifting frame; 7, guide column; 8, clamping arm; 81, rotating rod; 82, pressure plate; 83, recess; 84, first pressing plane; 85, second pressing plane; 9, cup wallpaper; 91, paper; 92, plastic film; 93, extended plastic film; 94, overlapping part. DETAILED DESCRIPTION

[0033] The present invention will be further described below in the form of embodiments in conjunction with the accompanying drawings.

[0034] Embodiment 1:

[0035] like Figure 1 As shown, the welding device of the leakage-proof paper cup comprises a base 5 and a lifting frame 6 arranged above the base 5, the lifting frame 6 is connected to the base 5 through a guide column 7, and is driven by a power source to move up and down, and a welding head 2 is connected to the lifting frame 6. A crossbeam is arranged on the base 5, and a horizontally arranged columnar welding seat 1 for placing the cup wallpaper sheet 9 is fixedly connected to the crossbeam, the welding head 2 is located above the welding seat 1 and directly faces the welding seat 1 from below and above, and the welding head 2 comprises a long strip bottom surface matching the length of the columnar seat body 11 and a heater for heating the long strip bottom surface, and the long strip bottom surface forms a second welding surface 21.

[0036] Combination Figure 1 ,like Figure 2As shown, an opening 51 is provided between the crossbeam and the base 5 for allowing the fan-shaped cup wallpaper sheet 9 to pass through. The cup wallpaper sheet 9 includes an outer paper 91 and a plastic film 92 covering the inner side of the paper, as well as an extension 93 extending out of the cross section of the paper. A pair of clamping arms 8 are provided at the opening 51, and the welding seat 1 is arranged between the clamping arms 8. Each clamping arm 8 includes a rotating rod 81 and a pressing plate 82 having a notch 83 fixedly connected to the rotating rod 81. The shape of the notch 83 is arc-shaped and matches the outer peripheral surface of the welding seat 1. The two clamping arms 8 are opened at different angles, and the opening angle on the left side is greater than the opening angle on the right side. Under the condition of constant speed, the clamping arms 8 on both sides push the fan-shaped cup wall paper 9 to move toward the welding seat 1 together, and the right clamping arm 8 clamps first, and the left clamping arm 8 clamps later. The successive clamping can fold the seam parts in order, and the fan-shaped cup wallpaper sheet 9 is pressed tightly against the welding seat 1 through the pressing plate 82, forming a shape as shown in the figure. Figure 3 The status shown. Figure 4 As described above, after the fan-shaped cup wallpaper sheet 9 is clamped, the welding head 2 moves downward under the drive of the lifting mechanism and presses on the joint part 94 for welding. After the welding is completed, the welding head 2 moves upward, the clamping arm 8 is released, and the robot pulls the welded cylindrical paper cup paper 9 outward along the welding seat 1 to the receiving rod 12 of the welding seat 1.

[0037] A first welding surface 13 is provided on the cylindrical surface of the welding seat 1, and a second welding surface 21 is provided on the bottom surface of the welding head 2 to form a downward press fit with the first welding surface 13. In this example, Figure 5 As shown, the first welding surface 13 is a stepped surface, and the second welding surface 21 is a plane. The stepped surface includes a first step plane 3 and a second step plane 4 that is higher than the first step plane 3, and also includes a step vertical surface 10. The step vertical surface 10 connects and is perpendicular to the first step plane 3 and the second step plane 4. The length direction of the step vertical surface 10 is arranged parallel to the axial direction of the columnar seat body 11.

[0038] like Figure 6The cross section of the seat body 11 of the welding seat 1 is shown, and the clamping arm 8 is omitted in this figure. As can be seen from the figure, the welding seat 1 includes a cylindrical seat body 11 with a circular or elliptical cross section, and a tapered outer peripheral surface with a taper is formed on the cylindrical seat body 11 along the axial direction. The shape of the first welding surface 13 on the upper side of the tapered outer peripheral surface is a stepped surface, including a first stepped plane 3 and a second stepped plane 4. The fan-shaped cup wallpaper sheet 9 with the extended plastic film 93 has been coated on the seat body 11 of the columnar welding seat 1. After coating, the two sections of the fan-shaped cup wallpaper sheet 9 overlap each other, wherein the extended plastic film 93 is located on the first step plane 3, and the section of the fan-shaped cup wallpaper sheet 9 with the extended plastic film 93 is located on the second step plane 4. The other section of the fan-shaped cup wallpaper sheet 9 overlaps and covers the section of the fan-shaped cup wallpaper sheet 9 with the extended plastic film 93, so that the four-layer structure formed by the overlapping part 94 of the cup wallpaper sheet 9 is located on the second step plane 4, and the height is reduced. The three-layer structure formed by the extended plastic film 93 and the cup wallpaper sheet 9 above it is located on the first step plane 3. In this way, the height difference of the seam part of the anti-leakage paper cup is eliminated. After the welding head 2 moves down, the plastic film is directly melted to bond the seam part together, and the paper section is coated in the plastic film.

[0039] Embodiment 2:

[0040] The content of the second embodiment is basically the same as that of the first embodiment, except that Figure 7 As shown, the first welding surface 13 is a plane, the second welding surface 21 is a stepped surface, the four-layer structure formed by the overlapping parts of the paper sections is located vertically opposite to the first stepped plane 3, and the three-layer structure formed by the extended plastic film and the paper section above it is located vertically opposite to the second stepped plane 4.

[0041] Embodiment three:

[0042] The content of the third embodiment is basically the same as that of the first embodiment, except that Fig.10 As shown, the cross section of the seat body 11 of the welding seat 1 is waist-shaped.

[0043] When the notch 83 of the left side pressing plate 82 covers the left side of the outer peripheral surface of the welding seat 1, the upper end of the pressing plate 82 is located on the second step plane 4, and the inner side of the notch 83 located at the upper end is the second pressing plane 85, and the paper is pressed down through the second pressing plane 85. When the notch 83 of the right side pressing plate 82 covers the right side of the outer peripheral surface of the welding seat 1, the upper end of the pressing plate 82 is located on the first step plane 3, and the inner side of the notch 83 located at the upper end is the first pressing plane 84, and the paper is pressed down through the first pressing plane 84. The waist-shaped welding seat 1 can make the welding surface larger, and the bending angle between the welding surface and the side surface becomes larger. When the fan-shaped paper is pressed to the welding surface by the upper end of the pressing plate 82, the overlapping part of the fan-shaped paper can be formed into a straight state, which is conducive to extending the flatness of the plastic film part. During welding, it can ensure the flatness of each layer of paper after the welding head 2 is pressed down, and improve the yield rate.

[0044] Embodiment 4:

[0045] The content of the fourth embodiment is basically the same as that of the first embodiment, except that, as shown in 12, the first welding surface 13 of the welding seat 1 is a stepped surface, the second welding surface 21 of the welding head 2 is a plane, the stepped surface includes a first stepped plane 3 and a second stepped plane 4 higher than the first stepped plane 3, and also includes a stepped vertical surface 10, the stepped vertical surface 10 connects and is perpendicular to the first stepped plane 3 and the second stepped plane 4, and the length direction of the stepped vertical surface 10 is inclined relative to the columnar seat body 11. Correspondingly, the length direction of the welding head 2 is also inclined, in the same direction as the length direction of the stepped vertical surface 10.

[0046] This structure is mainly suitable for asymmetric fan-shaped cup wallpaper sheets 9, such as Fig.11 As shown, the uncut papers on both sides have straight edges, and the asymmetrical fan-shaped cup wallpaper sheet 9 formed after cutting has an inclined seam portion when rolled into a tube. The inclined setting of the length direction of the stepped vertical surface 10 relative to the columnar base 11 can form a clearance space.

[0047] Embodiment five:

[0048] The content of the fifth embodiment is basically the same as that of the third embodiment, except that Fig.13As shown, the first welding surface 13 is a step surface, and the second welding surface 21 is also a step surface, and the step surface of the first welding surface 13 and the step surface of the second welding surface 21 are staggered so that the two step surfaces can fit together. That is, the step surface of the first welding surface 13 includes a first step plane 3 and a second step plane 4 higher than the first step plane 3, and the step surface of the second welding surface 21 includes a first step plane 31 and a second step plane 41 higher than the first step plane 31. The first step plane 3 of the first welding surface 13 and the second step plane 41 of the second welding surface 21 are directly opposite to each other up and down, and the second step plane 4 of the first welding surface 13 and the first step plane 31 of the second welding surface 21 are directly opposite to each other up and down. In this way, a staggered arrangement is formed. Since both are step surfaces, the total height difference can be evenly distributed by the height of the step vertical surfaces in the two step surfaces, so that the height difference of the step vertical surfaces of each step surface is reduced, and better flatness can be achieved when performing downward pressure welding.

[0049] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A welding device for leak-proof paper cups, comprising a welding seat (1) for placing paper cup paper and a welding head (2) capable of rising and falling relative to the welding seat (1), characterized in that: The welding seat (1) is columnar and horizontally arranged. The welding head (2) is located above the welding seat (1). A first welding surface (13) is provided on the columnar surface of the welding seat (1). A second welding surface (21) is provided on the bottom surface of the welding head (2) to form a downward press fit with the first welding surface (13). At least one of the first welding surface (13) and the second welding surface (21) is a stepped surface. The other of the first welding surface (13) and the second welding surface (21) is a plane or a stepped surface. The stepped surface includes a first stepped plane (3) and a second stepped plane (4) protruding from the first stepped plane (3). The welding seat (1) includes a columnar seat body (11) with a circular or elliptical cross section and a receiving rod (12) connected to the columnar seat body (11) for receiving a welded paper cup wall. A tapered outer peripheral surface with a taper is formed on the columnar seat body (11) along the axial direction. The first welding surface (13) is located on the upper side of the tapered outer peripheral surface.

2. The welding device for anti-leakage paper cup according to claim 1, characterized in that: The first welding surface (13) is a plane, and the second welding surface (21) is a stepped surface; or the first welding surface (13) is a stepped surface, and the second welding surface (21) is a plane; or the first welding surface (13) is a stepped surface, and the second welding surface (21) is a stepped surface, and the stepped surface of the first welding surface (13) and the stepped surface of the second welding surface (21) are arranged alternately so that the two stepped surfaces can fit together.

3. The welding device for anti-leakage paper cup according to claim 1 or 2, characterized in that: The step surface also includes a step vertical surface (10), which connects and is perpendicular to the first step plane (3) and the second step plane (4), and the length direction of the step vertical surface (10) is inclined or parallel to the axial direction of the columnar seat body (11).

4. The welding device for anti-leakage paper cup according to claim 2, characterized in that: The welding head (2) comprises a long strip bottom surface matching the length of the columnar seat (11) and a heater for heating the long strip bottom surface, and the long strip bottom surface forms the second welding surface (21).

5. The welding device for anti-leakage paper cup according to claim 1, 2 or 4, characterized in that: The welding device further comprises a base (5) and a lifting frame (6) arranged above the base (5); the lifting frame (6) is connected to the base (5) via a guide column (7) and is driven by a power source to move up and down; the welding head (2) is connected to the lifting frame (6); and the welding seat (1) is fixed on the base (5).

6. The welding device for anti-leakage paper cup according to claim 1, 2 or 4, characterized in that: The welding device further comprises a pair of clamping arms (8), the welding seat (1) being arranged between the clamping arms (8), each clamping arm (8) comprising a rotating rod (81) and a pressing plate (82) having a notch (83) fixedly connected to the rotating rod (81), wherein the shape of the notch (83) matches the outer peripheral surface of the welding seat (1).

7. The welding device for anti-leakage paper cup according to claim 6, characterized in that: The cross section of the columnar seat body (11) of the welding seat (1) is waist-shaped, the notch (83) of one pressing plate (82) is arc-shaped, and when covering the left side of the outer peripheral surface of the welding seat (1), the upper end of the pressing plate (82) is located on the second step plane (4), and the notch (83) of the other pressing plate (82) is arc-shaped, and when covering the right side of the outer peripheral surface of the welding seat (1), the upper end of the pressing plate (82) is located on the first step plane (3).

8. The welding device for anti-leakage paper cup according to claim 7, characterized in that: A first pressing plane (84) is provided inside a notch (83) at the upper end of one of the pressing plates (82), and a second pressing plane (85) is provided inside a notch (83) at the upper end of another of the pressing plates (82).

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