A hot melt welding device for foldable plastic bottles

Abstract

The present invention belongs to the technical field of joining prefabricated parts, and in particular to a hot-melt welding device for a foldable plastic bottle. The foldable plastic bottle is a square structure, and the square-structured foldable plastic bottle is divided into a supporting hard part and a deformable soft part along a diagonal direction, and a bottle mouth is provided on the deformable soft part, and the deformable soft part is used to fold into the bottle; it also includes two extrusion pieces that clamp and fix the connection between the supporting hard part and the deformable soft part, and the inner wall surface of the extrusion piece fits with the outer surface of the foldable plastic bottle. When the two extrusion pieces are butt-joined, they form a rectangular frame structure, and both extrusion pieces can move in a straight line along the connection between the supporting hard part and the deformable soft part, and the inner wall surface of the extrusion piece fits with the outer surface of the foldable plastic bottle, so that the butt joint of the supporting hard part and the deformable soft part can be aligned, which is beneficial to subsequent hot-melt welding work, improves welding effect, and reduces scrap rate.

Description

Technical Field

[0001] The invention belongs to the technical field of joining prefabricated parts, and in particular relates to a hot-melt welding device for a foldable plastic bottle. Background Art

[0002] After plastic bottles are produced, they need to be transported. Plastic bottles are light in weight and large in size, which means that they take up a lot of space when transporting them. By setting the plastic bottles to a foldable structure, while ensuring their structural stability, they also need to have the characteristic of reducing their volume by folding. If softer materials are used to produce plastic bottles, although the foldable characteristics of the plastic bottles are achieved, the plastic bottles will be relatively soft overall, have no support when held in the hand, and are prone to deformation. When foldable plastic bottles are produced using materials of different softness and hardness, such plastic bottles have certain difficulties in welding. Summary of the invention

[0003] To solve the problems raised in the above background technology, the present invention provides a hot melt welding device for a foldable plastic bottle, which has the characteristics of aligning the butt joints of the supporting hard part and the deformable soft part, facilitating the subsequent hot melt welding work, improving the welding effect and reducing the scrap rate.

[0004] To achieve the above object, the present invention provides the following technical solutions: a hot melt welding device for a foldable plastic bottle, the foldable plastic bottle is a square structure, the foldable plastic bottle with a square structure is divided into a supporting hard part and a deformable soft part along a diagonal direction, the deformable soft part is provided with a bottle mouth, and the deformable soft part is used to fold into the bottle;

[0005] It also includes two extrusion parts that clamp and fix the connection between the supporting hard part and the deformable soft part. The inner wall surface of the extrusion part fits the outer surface of the foldable plastic bottle. When the two extrusion parts are connected, they form a rectangular frame structure, and both extrusion parts can move in a straight line along the connection between the supporting hard part and the deformable soft part.

[0006] As a preferred embodiment of the hot-melt welding device for a foldable plastic bottle of the present invention, it also includes an air pipe for blowing air into the inside of the foldable plastic bottle through the bottle mouth during the welding operation of the foldable plastic bottle.

[0007] As a preferred hot-melt welding device for a foldable plastic bottle of the present invention, the supporting hard part and the deformable soft part are connected by a deformable connecting layer, and the deformable connecting layer is provided with a concave part that is recessed into the interior of the foldable plastic bottle.

[0008] As a preferred hot-melt welding device for a foldable plastic bottle of the present invention, the deformable connecting layer and the deformable soft part are integrally formed.

[0009] As a preferred embodiment of the hot-melt welding device for a foldable plastic bottle of the present invention, a convex strip for cooperating with an inner concave portion of the deformable connecting layer is fixedly connected to the inner side of the extrusion piece.

[0010] As a preferred hot-melt welding device for a foldable plastic bottle of the present invention, a receiving groove is provided at the welding surface of the deformable connecting layer, and a metal wire is fixedly connected to the inner side of the receiving groove.

[0011] As a preferred hot-melt welding device for a foldable plastic bottle of the present invention, iron powder is attached to the welding surface of the deformable connecting layer or the supporting hard part and / or the deformable soft part through an adhesive.

[0012] As a preferred hot-melt welding device for a foldable plastic bottle of the present invention, after the foldable plastic bottle is fixed by the extrusion piece, the joint of the foldable plastic bottle is hot-melt welded by the sensor.

[0013] As a preferred hot-melt welding device for a foldable plastic bottle of the present invention, after the foldable plastic bottle is fixed by the extrusion piece, the joints of the foldable plastic bottle are hot-melt welded by an ultrasonic welding device.

[0014] As a preferred hot-melt welding device for a foldable plastic bottle of the present invention, a connecting bracket is fixedly connected to the outer surface of the extrusion piece, the top end of the connecting bracket is fixedly connected to the end of the main shaft of the double-axis telescopic rod, the outer rod of the double-axis telescopic rod is fixedly connected to the hanging conveying part through a fixing bracket, the outer side of one end of the fixing bracket is fixedly connected to a pipe rack, and one end of the pipe rack is fixedly connected to the exhaust end of the air pipe;

[0015] The sensor is fixedly connected to the main shaft end of the single-axis telescopic rod through a supporting frame.

[0016] Compared with the prior art, the beneficial effects of the present invention are: when hot-melt welding is performed on the joints of the supporting hard part and the deformable soft part, the foldable plastic bottle is clamped by the extrusion piece. Since the extrusion piece is extruded in the diagonal direction of the foldable plastic bottle, the foldable plastic bottle can be stably clamped, thereby reducing the complexity of the clamping work and improving the stability after clamping. The inner wall surface of the extrusion piece fits the outer surface of the foldable plastic bottle, so that the joints of the supporting hard part and the deformable soft part can be aligned, which is beneficial to the subsequent hot-melt welding work, improves the welding effect, and reduces the scrap rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 It is a schematic diagram of the separation state of the extrusion part in the present invention;

[0020] Figure 3 It is a schematic diagram of the heating state of the joint of the foldable plastic bottle by the sensor in the present invention;

[0021] Figure 4 It is a schematic diagram of the arrangement position of the convex strips in the present invention;

[0022] Figure 5 It is a schematic diagram of the structure of the foldable plastic bottle in the present invention;

[0023] Figure 6 It is a schematic diagram of the deformable soft part folding inwards in the present invention;

[0024] Figure 7 This is a schematic diagram of the explosion structure of the foldable plastic bottle of the present invention;

[0025] Figure 8 A schematic diagram of the opening position of the receiving groove in the present invention;

[0026] In the figure:

[0027] 1. Supporting hard part; 2. Deformable soft part; 3. Deformable connecting layer; 31. Accommodating groove; 32. Inner concave part; 4. Metal wire; 5. Extrusion piece; 51. Raised strip; 6. Trachea;

[0028] 7. Sensor; 8. Support frame; 9. Single-axis telescopic rod; 10. Connecting bracket; 11. Double-axis telescopic rod; 12. Fixed frame; 13. Suspension conveying part; 14. Pipe rack. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0030] like Figure 1-Figure 8 As shown:

[0031] A hot-melt welding device for a foldable plastic bottle. The foldable plastic bottle is a square structure. The foldable plastic bottle is divided into a supporting hard part 1 and a deformable soft part 2 along a diagonal direction. The deformable soft part 2 is provided with a bottle mouth. The deformable soft part 2 is used to fold into the bottle.

[0032] It also includes two extrusion parts 5 that are clamped and fixed at the connection between the supporting hard part 1 and the deformable soft part 2. The inner wall surface of the extrusion part 5 fits with the outer surface of the foldable plastic bottle. The two extrusion parts 5 form a rectangular frame structure when connected, and the two extrusion parts 5 can move in a straight line along the connection between the supporting hard part 1 and the deformable soft part 2.

[0033] In this embodiment, the plastic bottles need to be transported after they are produced. The plastic bottles are light in weight and large in size, which means that they take up a lot of space when transported. By setting the plastic bottles to a foldable structure, while ensuring that they have structural stability, they also need to have the characteristic of reducing their volume by folding. If a relatively soft material is used to produce the plastic bottles, although the foldable characteristic of the plastic bottles is achieved, the plastic bottles will be relatively soft as a whole, and will have no support when held by hand, and will be easily deformed. When the foldable plastic bottles are produced by using materials with different softness and hardness, such plastic bottles will have certain difficulties in welding.

[0034] In a conventional retractable plastic bottle with a symmetrical structure, the upper part or the lower part is made of a hard material, and one can only hold the hard material part on the upper side or the lower side by hand. In order to reduce the volume after folding, the folding part of the upper and lower parts of the conventional foldable plastic bottle is usually located in the middle of the bottle body, and the center of gravity of the plastic bottle is usually in the middle of the bottle body or near the middle of the bottle body, which results in that the bottle body cannot provide good support force to the hand when the hand holds the middle position of the bottle body. The present invention arranges the foldable plastic bottle into a square structure, and the foldable plastic bottle with a square structure is divided into a supporting hard part 1 and a deformable soft part 2 along the diagonal direction, and the deformable soft part 2 can be folded into the bottle under the action of an external force (such as Figure 6 As shown), the volume is reduced. Moreover, the supporting hard part 1 and the deformable soft part 2 are both configured as triangular prism structures. Since the supporting hard part 1 does not need to be folded, the supporting hard part 1 is used as the supporting structure of the entire plastic bottle. The triangle has stability, so that the supporting hard part 1 itself has a certain structural stability, and the range of hand-gripping is increased, so that the hand-gripping can be performed at a better gripping part. The deformable soft part 2 is also a triangular prism structure. Therefore, when the material of the deformable soft part 2 is relatively soft, it can still have better structural stability than the traditional folding structure.

[0035] When hot-melt welding is performed on the joints of the supporting hard part 1 and the deformable soft part 2, the foldable plastic bottle is clamped by the extrusion piece 5. Since the extrusion piece 5 is extruded in the diagonal direction of the foldable plastic bottle, the foldable plastic bottle can be stably clamped, which reduces the complexity of the clamping work and improves the stability after clamping. The inner wall surface of the extrusion piece 5 fits the outer surface of the foldable plastic bottle, so that the joints of the supporting hard part 1 and the deformable soft part 2 can be aligned, which is beneficial to the subsequent hot-melt welding work, improves the welding effect, and reduces the scrap rate.

[0036] Since both extrusion members 5 can move in a straight line along the connection between the supporting hard part 1 and the deformable soft part 2, the operation of clamping the foldable plastic bottle by the extrusion members 5 is more convenient;

[0037] It should be noted that an anti-sticking layer may be provided on the inner wall surface of the extrusion member 5 to prevent the foldable plastic bottle from adhering to the inner wall surface of the extrusion member 5 at the joint during the hot melting process. The anti-sticking layer may be a Teflon (polytetrafluoroethylene) coating or a Teflon tape.

[0038] In addition, the foldable plastic bottle is preferably a cube, which can achieve a better folding effect.

[0039] In an optional embodiment, it also includes an air pipe 6 for blowing air into the inside of the collapsible plastic bottle through the bottle mouth during the collapsible plastic bottle welding operation.

[0040] In this embodiment, after the foldable plastic bottle is clamped and fixed by the extrusion piece 5, air is blown into the inside of the foldable plastic bottle through the air pipe 6, so that the outer surface of the foldable plastic bottle can be more closely fitted to the extrusion piece 5, so that the connection between the supporting hard part 1 and the deformable soft part 2 can be better aligned and the error can be reduced.

[0041] In an optional embodiment, the supporting hard part 1 and the deformable soft part 2 are connected via a deformable connecting layer 3, and the deformable connecting layer 3 is provided with an inner concave part 32 that is concave toward the inside of the foldable plastic bottle.

[0042] In this embodiment, the deformable connection layer 3 is provided to further improve the deformation effect of the deformable soft part 2, and to avoid the rupture of the part of the deformable soft part 2 with the largest bending amplitude. At the same time, the deformable connection layer 3 can improve the structural strength of the joint between the supporting hard part 1 and the deformable soft part 2. That is to say, the deformable connection layer 3 has the function of reinforcing ribs, so that the deformable connection layer 3 has the effect of facilitating folding and increasing structural strength. Of course, this effect is based on the oblique arrangement of the deformable connection layer 3.

[0043] like Figure 5 As shown, the outer side of the supporting hard part 1 is also provided with a protrusion, which is used for anti-slip when holding by hand.

[0044] In an optional embodiment, the deformable connecting layer 3 and the deformable soft part 2 are integrally formed.

[0045] In this embodiment, the deformable connection layer 3 and the deformable soft part 2 are integrally formed, which can further reduce the difficulty of hot-melt welding between the supporting hard part 1 and the deformable soft part 2 and further improve the welding yield rate.

[0046] In an optional embodiment, a convex strip 51 for cooperating with the inner concave portion 32 of the deformable connecting layer 3 is fixedly connected to the inner side of the extruded member 5 .

[0047] In this embodiment, when the convex strip 51 cooperates with the inner recess 32, the convex strip 51 can support the inner recess 32, and then during the hot melt welding work, the deformable connecting layer 3 can maintain the basic shape and will not be deformed, which has a further improvement effect on the processing yield. In particular, during the work of blowing air into the foldable plastic bottle, the deformable connecting layer 3 can be prevented from being deformed, and it is beneficial to the positioning of the deformable connecting layer 3 relative to the supporting hard part 1 and the deformable soft part 2.

[0048] In an optional embodiment, a receiving groove 31 is provided at the welding surface of the deformable connecting layer 3 , and a metal wire 4 is fixedly connected to the inner side of the receiving groove 31 .

[0049] In this embodiment, the metal wire 4 can be fixed in the receiving groove 31 by gluing. This situation is more convenient for processing when the wall thickness of the foldable plastic bottle is greater than 0.5 mm. It should be noted that the metal wire 4 needs to be made of a material that can be heated by the sensor 7. In fact, there is no non-conductive metal, but for economic and processing considerations, the metal wire 4 is preferably made of iron / iron alloy or copper.

[0050] In an optional embodiment, iron powder is attached to the welding surface of the deformable connecting layer 3 or the supporting hard part 1 and / or the deformable soft part 2 by an adhesive.

[0051] In this embodiment, when the wall thickness of the foldable plastic bottle is less than 0.5 mm and it is difficult to fix the metal wire 4, the processing method of this embodiment can be adopted. Adhesive is applied to the welding surface of the deformable connecting layer 3 or the supporting hard part 1 and / or the deformable soft part 2, and then iron powder is dipped in it. The iron powder can be fixed at the joint of the foldable plastic bottle. The iron powder can also be stuck to the joint of the foldable plastic bottle by blowing the iron powder.

[0052] In an optional embodiment, after the extruder 5 fixes the foldable plastic bottle, the sensor 7 performs heat-melt welding on the joints of the foldable plastic bottle.

[0053] In the case where the metal wire 4 is provided, the metal wire 4 is located between the butt joints of the foldable plastic bottle, and the inductor 7 is controlled to work by the electromagnetic induction heating device. The inductor 7 heats the metal wire 4 through a high-frequency alternating magnetic field. After the metal wire 4 is heated, the butt joints of the foldable plastic bottle are melted, thereby achieving hot melt welding. After the hot melt welding is completed, the metal wire 4 is still located inside the foldable plastic bottle;

[0054] In the case where iron powder is stuck to the joint of the foldable plastic bottle, this embodiment can be considered when the wall thickness of the foldable plastic bottle is less than 0.5 mm. The same principle is used. The inductor 7 heats the iron powder through a high-frequency alternating magnetic field, so that the iron powder melts the joint of the foldable plastic bottle to achieve hot-melt welding. After the hot-melt welding is completed, the iron powder is still located inside the foldable plastic bottle. Since the hot-melted plastic part can pass through the gap between the iron powder, a better hot-melt firming effect can be obtained. However, the dotted distribution of iron powder can be seen from the appearance, which is not very beautiful.

[0055] It should be noted that the extrusion 5 should be made of a non-conductive hard material, such as hard plastic. When the extrusion 5 is made of hard plastic, the extrusion 5 will not hinder the high-frequency alternating magnetic field from heating the metal wire or iron powder, because plastic is an insulator and does not generate induced current like metal. Therefore, for the high-frequency alternating magnetic field, the plastic basically has no electromagnetic induction reaction. This is because there are no large number of freely movable electrons inside the plastic, and thus eddy currents generated by electromagnetic induction in metals cannot be formed.

[0056] From the perspective of magnetic field propagation, plastic has very little obstruction to the magnetic field. High-frequency alternating magnetic fields can easily penetrate plastic because the magnetic permeability of plastic is very close to the magnetic permeability of vacuum. According to the principle of magnetic field propagation in the medium, the attenuation degree of the magnetic field in plastic is very low.

[0057] In an optional embodiment, after the extruder 5 fixes the foldable plastic bottle, the joints of the foldable plastic bottle are heat-melted by an ultrasonic welding device.

[0058] In this embodiment, when the supporting hard part 1 and the deformable soft part 2 are butted together, or when the supporting hard part 1 and the deformable soft part 2 are butted together through the deformable connecting layer 3 without using the metal wire 4 or the iron powder, the joint of the foldable plastic bottle can be hot-melt welded by an ultrasonic welding device, and the shape of the ultrasonic welding head of the ultrasonic welding device only needs to be adapted to the outer surface of the foldable plastic bottle, such as Figure 2 In the orientation shown, the two parts of the ultrasonic welding head can contact and heat the joint of the foldable plastic bottle from the upper and lower directions.

[0059] In an optional embodiment, a connecting bracket 10 is fixedly connected to the outer surface of the extrusion member 5, the top end of the connecting bracket 10 is fixedly connected to the end of the main shaft of the biaxial telescopic rod 11, the outer rod of the biaxial telescopic rod 11 is fixedly connected to the suspension conveying part 13 through a fixing bracket 12, and a pipe rack 14 is fixedly connected to the outer side of one end of the fixing bracket 12, and one end of the pipe rack 14 is fixedly connected to the exhaust end of the air pipe 6;

[0060] The sensor 7 is fixedly connected to the main shaft end of the single-axis telescopic rod 9 through the support frame 8.

[0061] In this embodiment, the suspension conveying part 13 is a part of a catenary conveying system or a ring suspension system. The suspension conveying part 13 can drive the fixing frame 12 and then drive the double-axis telescopic rod 11 to move. The double-axis telescopic rod 11 will drive the connecting bracket 10 and then drive the extrusion member 5 to move.

[0062] The two extrusion pieces 5 are driven to separate by the double-axis telescopic rod 11, and then the foldable plastic bottle is placed between the two extrusion pieces 5. The two extrusion pieces 5 move toward each other to clamp and fix the foldable plastic bottle. When the hanging conveying part 13 drives the foldable plastic bottle to move above the sensor 7, the movement is paused, and the single-axis telescopic rod 9 drives the support frame 8 and thus drives the sensor 7 to move upward, so that the sensor 7 moves to the docking point of the foldable plastic bottle, and the docking point of the foldable plastic bottle is hot-melted by the magnetic field generated by the sensor 7.

[0063] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A hot melt welding device for a foldable plastic bottle, characterized in that: The foldable plastic bottle has a square structure, and is divided into a supporting hard part (1) and a deformable soft part (2) along a diagonal direction. The deformable soft part (2) is provided with a bottle mouth, and the deformable soft part (2) is used to fold into the bottle. It also comprises two extrusion members (5) which clamp and fix the connection between the supporting hard part (1) and the deformable soft part (2); the inner wall surface of the extrusion member (5) fits the outer surface of the foldable plastic bottle; the two extrusion members (5) form a rectangular frame structure when they are butt-jointed; and both extrusion members (5) can move in a straight line along the connection between the supporting hard part (1) and the deformable soft part (2).

2. The hot melt welding device for a foldable plastic bottle according to claim 1, characterized in that: The invention also includes an air pipe (6) for blowing air into the inner side of the collapsible plastic bottle through the bottle mouth during the welding work of the collapsible plastic bottle.

3. The hot melt welding device for a foldable plastic bottle according to claim 1 or 2, characterized in that: The supporting hard part (1) and the deformable soft part (2) are connected via a deformable connecting layer (3), and the deformable connecting layer (3) is provided with an inner concave part (32) that is recessed toward the inside of the foldable plastic bottle.

4. The hot melt welding device for a foldable plastic bottle according to claim 3, characterized in that: The deformable connecting layer (3) and the deformable soft part (2) are integrally formed.

5. The hot melt welding device for a foldable plastic bottle according to claim 3, characterized in that: A convex strip (51) for cooperating with the inner concave portion (32) of the deformable connection layer (3) is fixedly connected to the inner side of the extruded piece (5).

6. The hot melt welding device for a foldable plastic bottle according to claim 5, characterized in that: A receiving groove (31) is provided at the welding surface of the deformable connection layer (3), and a metal wire (4) is fixedly connected to the inner side of the receiving groove (31).

7. The hot melt welding device for a foldable plastic bottle according to claim 5, characterized in that: Iron powder is attached to the welding surface of the deformable connection layer (3) or the supporting hard part (1) or / and the deformable soft part (2) via an adhesive.

8. The hot melt welding device for a foldable plastic bottle according to claim 6 or 7, characterized in that: After the extrusion piece (5) fixes the foldable plastic bottle, the joints of the foldable plastic bottle are heat-melted and welded by the sensor (7).

9. The hot melt welding device for a foldable plastic bottle according to claim 1, 2, 4 or 5, characterized in that: After the extrusion piece (5) fixes the foldable plastic bottle, the joints of the foldable plastic bottle are heat-melted and welded by an ultrasonic welding device.

10. The hot melt welding device for a foldable plastic bottle according to claim 1, characterized in that: A connecting bracket (10) is fixedly connected to the outer surface of the extrusion member (5); the top end of the connecting bracket (10) is fixedly connected to the end of the main shaft of the biaxial telescopic rod (11); the outer rod of the biaxial telescopic rod (11) is fixedly connected to the suspension conveying portion (13) via a fixing bracket (12); a pipe bracket (14) is fixedly connected to the outer side of one end of the fixing bracket (12); and one end of the pipe bracket (14) is fixedly connected to the exhaust end of the air pipe (6); The sensor (7) is fixedly connected to the main shaft end of the single-axis telescopic rod (9) via a support frame (8).

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