A waterproof cap hot melt welding machine nozzle
By designing a waterproof cap-type hot melt welding machine nozzle with a three-way pipe structure, the problems of welding quality and compatibility were solved, resulting in a more robust weld and a more efficient welding process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WENZHOU SHUNYI WELDING EQUIPMENT CO LTD
- Filing Date
- 2025-08-19
- Publication Date
- 2026-07-21
AI Technical Summary
The welding quality of existing waterproof caps is greatly affected by the skill level of the workers, and the poor compatibility of the welding machine nozzles leads to weak welds or low efficiency.
Design a welding nozzle for a waterproof cap hot melt welding machine. It adopts a three-way pipe structure, and the air outlets on both sides are flared structures with adjustable curvature to adapt to caps of different sizes. It can perform automatic hot melt welding through a hot air gun.
This resulted in stronger welds, wider compatibility, improved welding efficiency, reduced risk of leaks, and lower labor and time costs.
Smart Images

Figure CN224528033U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a welding nozzle for a waterproof cap hot melt welding machine. Background Technology
[0002] In the field of waterproofing engineering, the installation quality of waterproof caps plays a crucial role in ensuring waterproofing effectiveness. Currently, the connection between waterproof caps and pipes or other components is mostly achieved through thermofusion welding. Traditional manual thermofusion welding relies on workers using tools such as hot air guns to heat the waterproof cap and the connection area, quickly bonding the two together after the material melts. This method has many drawbacks. On the one hand, the skill level and experience of workers greatly affect the welding quality; for example, slight deviations in controlling the heating temperature and time can lead to weak welds, gaps, and potential leaks. On the other hand, manual operation is extremely inefficient, consuming significant manpower and time costs in large-scale waterproofing projects.
[0003] Currently, existing welding machine nozzles have poor compatibility. Because the waterproof caps come in various sizes, such as 40mm, 50mm, 75mm, 100mm, 110mm, etc., if the diameter of the air outlet is smaller than the diameter of the waterproof cap, it is easy for the heat to not reach the edge. If the diameter of the air outlet is larger than the diameter of the waterproof cap, the waterproof cap is easy to fall into the air outlet. Utility Model Content
[0004] To solve the above problems, a waterproof cap hot melt welding machine nozzle has been specially manufactured, which can be adapted to caps of various sizes and has a good hot melt effect.
[0005] To achieve the above objectives, the present invention provides a welding nozzle for a waterproof cap hot melt welding machine, comprising a three-way pipe, the three-way pipe having an air inlet, a first air outlet and a second air outlet, the air inlet being perpendicular to the first air outlet and the second air outlet, the first air outlet and the second air outlet being vertically connected, and the air inlet being connected to a hot air gun.
[0006] Furthermore, the air inlet is located in the middle of the first air outlet and the second air outlet.
[0007] Furthermore, the first air outlet has a funnel-shaped opening.
[0008] Furthermore, the second air outlet also has a flared opening structure.
[0009] Furthermore, the flared structure of the first air outlet has a different curvature than that of the flared structure of the second air outlet.
[0010] The advantages of this utility model are: 1. The air outlet has a flared shape, with the diameter gradually increasing from the center outwards. This allows waterproof caps of different diameters to fit snugly against the flared opening. Simultaneously, the hot air source automatically diffuses along the flared opening, heat-melting the waterproof cap and its edges for a stronger weld.
[0011] 2. Both air outlets are designed with a flared shape, which allows for interchangeability between the two outlets. If one outlet is blocked or has foreign matter adhering to its surface, the other outlet can be used for heat fusion. Furthermore, the different curvatures of the flared structures on the two outlets further expand their compatibility with waterproof caps. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the welding nozzle and hot air gun of a waterproof cap hot melt welding machine according to this utility model.
[0013] Figure 2 This is a cross-sectional schematic diagram of a welding nozzle for a waterproof cap hot melt welding machine according to the present invention.
[0014] Figure 3 This is a cross-sectional schematic diagram of a second embodiment of a waterproof cap hot melt welding machine nozzle according to the present invention.
[0015] Figure 4 This is a cross-sectional schematic diagram of a second embodiment of a waterproof cap hot melt welding machine nozzle according to the present invention.
[0016] Attached labels: 1. Hot air gun, 2. Air inlet, 3. First air outlet, 4. Second air outlet, 5. Waterproof cap. Detailed Implementation
[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.
[0018] A welding nozzle for a waterproof cap hot melt welding machine includes a three-way pipe with an air inlet 2, a first air outlet 3, and a second air outlet 4. The air inlet 2 is perpendicular to the first air outlet 3 and the second air outlet 4, and the first air outlet 3 and the second air outlet 4 are vertically connected. The air inlet 2 is connected to a hot air gun 1. The air inlet 2 is located in the middle of the first air outlet 3 and the second air outlet 4. The first air outlet 3 has a flared opening. The second air outlet 4 also has a flared opening. The flared openings of the first air outlet 3 and the second air outlet 4 have different curvatures.
[0019] Example 1: Both air outlets have a flared structure with the same curvature, and the two flared structures are interchangeable. If one flared structure malfunctions, is obstructed, or has impurities on its surface, the other flared structure can be used instead. The air inlet 2 is positioned in the middle of the first air outlet 3 and the second air outlet 4 to ensure that the airflow on both sides is equal.
[0020] Example 2: The two air vents have flared structures with different curvatures. If the flared structure is too large relative to the diameter of the waterproof cap 5 (too large curvature), it will easily result in a small edge space, weakening the heat-sealing effect at the edges. Therefore, the curvature of the two flared vents can be designed differently to better adapt to waterproof caps 5 of different sizes.
[0021] In actual use, such as Figure 3 , Figure 4 As shown, place the waterproof cap 5 at the bolt connection hole, align the welding nozzle with the waterproof cap 5. The flared structure allows the welding nozzle to automatically align with the center of the waterproof cap 5. Start the hot air gun 1 to complete the hot melt welding.
[0022] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects. The scope of this invention is defined by the appended claims rather than the foregoing description, and it is therefore intended to include all variations falling within the meaning and scope of the equivalents of the claims within this invention.
Claims
1. A welding nozzle for a waterproof cap hot melt welding machine, characterized in that, It includes a three-way pipe with an air inlet (2), a first air outlet (3) and a second air outlet (4). The air inlet (2) is perpendicular to the first air outlet (3) and the second air outlet (4). The first air outlet (3) and the second air outlet (4) are connected vertically. The air inlet (2) is connected to the hot air gun (1). The air inlet (2) is located in the middle of the first air outlet (3) and the second air outlet (4). The opening of the first air outlet (3) is in the shape of a flared mouth, and the opening of the second air outlet (4) is also in the shape of a flared mouth.
2. The welding nozzle for a waterproof cap hot melt welding machine according to claim 1, characterized in that, The flared structure of the first air outlet (3) has a different curvature than that of the flared structure of the second air outlet (4).