A recessed nozzle for hot air welding

Abstract

The utility model discloses a kind of inner recess type nozzles for hot air welding, including body part and nozzle mouth part, the upper and lower surface of body part end portion is provided with the oblique surface of lamination, nozzle mouth part two sides extend forward, form extension, it is inner recess between two extensions, the inner recess is provided with spout, the inside of body part is provided with pressure cavity, the pressure cavity is communicated with spout;The air inlet pipe connected with the outer surface of pressure cavity and body part is communicated.The utility model uses inner recess type nozzle, effectively reduce nozzle front end to produce scale, under the condition of same speed, the hot air that inner recess type nozzle sprays is longer than the contact time of conventional nozzle welding material, and the utilization rate of hot air is higher.Inner recess type nozzle hot air does not spread to nozzle two sides, avoid hot air to cause damage to material outside welding area, significantly improve welding quality.Hot air is inducted back air cavity or exhaust groove, can control the position of hot air discharge, avoid hot air to accumulate in product inside.

Description

Technical Field

[0001] This utility model relates to the field of hot air welding technology, and in particular to a concave nozzle for hot air welding. Background Technology

[0002] When welding materials such as PVC, TPU, and PE, hot air and hot block welding are commonly used. Existing hot air welding nozzles are generally flat-nozzle type. However, the hot air from these nozzles tends to diffuse outwards after hitting the material, leaving marks at the edges of the welding area and affecting the product's appearance. Hot block welding, due to power limitations, has lower efficiency, and the surface of the hot block easily accumulates scale. This scale not only affects the heat transfer efficiency of the hot block but also, as it accumulates, can be carried into the welding area, impacting product quality. Because conventional hot air nozzles and hot blocks have flat tips, heat accumulates in the middle and is difficult to dissipate, resulting in a higher temperature in the middle of the welding area than on the sides, making it difficult to control the welding quality. This is especially problematic when producing products where venting is difficult (such as cylindrical products). After the cylindrical product is formed, it traps the hot air, preventing timely or complete venting. The accumulated hot air causes the internal temperature of the product to gradually rise, making it impossible to control the temperature at the welding point. In severe cases, welding may even be impossible, requiring a stoppage and waiting for cooling. This affects both welding efficiency and welding quality. Utility Model Content

[0003] To address the aforementioned technical problems, a concave nozzle for hot air welding is provided.

[0004] To achieve the above objectives, in a preferred embodiment of the present invention, the device includes a body and a nozzle orifice. Inclined contact surfaces are provided on the upper and lower surfaces of the end of the body. The two sides of the nozzle orifice extend forward to form extensions. Between the two extensions is a concave portion, and the concave portion is provided with a nozzle. A pressure chamber is provided inside the body and communicates with the nozzle. The pressure chamber is also communicated with an air inlet pipe connected to the outer surface of the body.

[0005] In a preferred embodiment, the present invention may be further configured such that the nozzle opening is recessed from both sides toward the center of the body.

[0006] In a preferred embodiment, the present invention may be further configured such that the upper and lower mating surfaces at the ends of the main body are provided with exhaust grooves, which extend from the concave portion to the upper and lower planes of the main body.

[0007] In a preferred embodiment, the present invention may be further configured such that a guide block is provided inside the main body, a return air cavity is provided inside the guide block, the air outlet of the return air cavity is provided on the side of the main body, and a guide groove and a return air duct that are not connected are opened on the top of the guide block. The guide groove is connected to the nozzle, and the return air port provided between the nozzles is connected to the return air duct. The return air duct is connected to the return air cavity.

[0008] In a preferred embodiment, the present invention may be further configured such that the air outlet is connected to an exhaust pipe.

[0009] Beneficial effects: This utility model discloses a concave nozzle for hot air welding. The concave nozzle design increases the distance between the central part of the nozzle and the welding zone, effectively reducing scale buildup at the nozzle tip. The concave nozzle creates a heating space between the tip and the welding material. At the same operating speed, compared to a conventional flat nozzle, the hot air from the concave nozzle has a longer contact time with the welding material, resulting in higher hot air utilization. Because the hot air from the welding zone is drawn into the return air chamber and discharged through the outlet or exhaust channel, the hot air does not diffuse to the sides of the nozzle, preventing damage to materials outside the welding zone and significantly improving welding quality. An exhaust pipe is connected to the outlet, facilitating the discharge of the hot air from the return air chamber away from enclosed or nearly enclosed products where exhaust is difficult, preventing hot air accumulation inside the product and allowing for better control of the welding temperature. Attached Figure Description

[0010] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0011] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model.

[0012] Figure 2 This is a cross-sectional view of one embodiment of the present utility model.

[0013] Figure 3 This is a schematic diagram of the structure of Embodiment 2 of this utility model.

[0014] Figure 4 This is a cross-sectional view of the return air duct in Embodiment 2 of this utility model.

[0015] Figure 5 This is a cross-sectional view of the nozzle in Embodiment 2 of this utility model.

[0016] Figure 6 This is a schematic diagram of the guide block in Embodiment 2 of this utility model.

[0017] Figure 7 This is a schematic diagram of the return air cavity in Embodiment 2 of this utility model.

[0018] Figure 8 This is a schematic diagram of the single-wheel usage method in Embodiment 2 of this utility model.

[0019] Figure 9 This is a schematic diagram of the dual-wheel usage method in Embodiment 2 of this utility model.

[0020] In the figure, 1 is the main body; 2 is the nozzle opening; 3 is the extension; 4 is the recess; 5 is the nozzle; 6 is the pressure chamber; 7 is the air inlet pipe; 8 is the exhaust groove; 9 is the return air chamber; 10 is the air outlet; 11 is the return air outlet; and 12 is the guide block. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Example 1 like Figure 1 and Figure 2 As shown, a concave nozzle for hot air welding includes a body portion 1 and a nozzle orifice portion 2. Inclined contact surfaces are provided on the upper and lower surfaces of the end portion of the body portion 1 (the end portion being the section near the nozzle). The contact surfaces can be adapted to the corresponding usage environment (for example, the contact surfaces can be curved when contacting rollers). The two sides of the nozzle orifice portion 2 extend forward to form extension portions 3. Between the two extension portions 3 is a concave portion 4. The concave portion 4 is provided with a nozzle 5. A pressure chamber 6 is provided inside the body portion 1. The pressure chamber 6 is connected to the nozzle 5. The pressure chamber 6 is connected to an air inlet pipe 7 connected to the outer surface of the body portion 1.

[0023] The nozzle opening 2 is recessed from both sides toward the middle of the body 1.

[0024] The upper and lower mating surfaces at the ends of the main body 1 are provided with exhaust grooves 8, which extend from the recessed portion 4 to the upper and lower planes of the main body 1.

[0025] Compared to flat nozzles, concave nozzles can better form a stable heating space with the materials being welded, and hot air is less likely to diffuse outwards to the sides of the nozzle. This increases the contact time between the hot air and the material, improves the heating speed, and reduces heat loss.

[0026] During use, in order to prevent hot air from being too concentrated in the welding area, exhaust groove 8 is used to control the position of hot air discharge, which is conducive to the smooth progress of welding work.

[0027] Example 2 like Figure 3-7As shown, a guide block 12 is provided inside the main body 1, and a return air cavity 9 is provided inside the guide block. The air outlet 10 of the return air cavity 9 is provided on the side of the main body 1. The top of the guide block 12 has a guide groove and a return air duct that are not connected. The guide groove is connected to the nozzle 5. The return air port 11 provided between the nozzles is connected to the return air duct. The return air duct is connected to the return air cavity 9.

[0028] The air outlet 10 is connected to the exhaust pipe.

[0029] To further improve the welding quality, a return air inlet is used to receive the hot air ejected from the nozzle into the welding area, and the hot air is discharged from the side. The nozzle and the return air inlet are not connected and are separate channels. The exhaust duct facilitates the discharge of the hot air collected in the return air chamber 9 away from the product when welding closed or nearly closed products where exhaust is not conducive to ventilation, thus preventing the internal temperature of the product from rising too high.

[0030] It should be noted that in this article, relational terms such as first and second are used only to distinguish one entity from another, and do not necessarily require or imply any such actual relationship or order between these entities.

[0031] The above examples are merely illustrative of this utility model and do not constitute a limitation on the scope of protection of this utility model. All designs that are the same as or similar to this utility model are within the scope of protection of this utility model.

Claims

1. A concave nozzle for hot air welding, characterized in that, It includes a body part (1) and a nozzle mouth part (2). Inclined contact surfaces are provided on the upper and lower surfaces of the end of the body part (1). The two sides of the nozzle mouth part (2) extend forward to form extension parts (3). There is a concave part (4) between the two extension parts (3). The concave part (4) is provided with a nozzle (5). A pressure chamber (6) is provided inside the body part (1). The pressure chamber (6) is connected to the nozzle (5). The pressure chamber (6) is connected to the air inlet pipe (7) connected to the outer surface of the body part (1).

2. The concave nozzle for hot air welding according to claim 1, characterized in that, The nozzle opening (2) is recessed from both sides toward the middle into the body part (1).

3. A concave nozzle for hot air welding according to claim 2, characterized in that, The upper and lower mating surfaces of the body part (1) are provided with exhaust grooves (8), which extend from the concave part (4) to the upper and lower planes of the body part (1).

4. A concave nozzle for hot air welding according to claim 2, characterized in that, The main body (1) is provided with a guide block (12) inside, and a return air cavity (9) is provided inside the guide block. The air outlet (10) of the return air cavity (9) is located on the side of the main body (1). The top of the guide block (12) has a guide groove and a return air duct that are not connected. The guide groove is connected to the nozzle (5). The return air port (11) provided between the nozzles is connected to the return air duct. The return air duct is connected to the return air cavity (9).

5. A concave nozzle for hot air welding according to claim 4, characterized in that, The air outlet (10) is connected to the exhaust pipe.

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