Explosion-proof hot air gun

Abstract

The application provides an explosion-proof hot air gun, which comprises a hot air gun body, the hot air gun body comprises a shell, a sealing cover, a heating assembly and a wind resistance plate are sequentially arranged in the shell along an axis, the wind resistance plate is provided with hot air guide holes, the wind resistance plate is connected with a grounding wire, the heating assembly comprises an explosion-proof base arranged in the shell, the explosion-proof base is uniformly provided with explosion-proof shells in a circumferential direction, the explosion-proof shells are provided with heating cores, and the explosion-proof base is also uniformly provided with cold air guide holes in the circumferential direction. The application is suitable for explosion-proof and anti-static places for dangerous operation, and the working efficiency of hot air is improved through the cooperation of the heating assembly and the wind resistance plate.

Description

Technical Field

[0001] This invention relates to the field of hot air gun technology, and in particular to an explosion-proof hot air gun. Background Technology

[0002] Currently, in the assembly of flammable and explosive hazardous materials, wire welding is often required. After welding, heat shrink tubing needs to be used to wrap the welded area. The well-known heat shrink method is to use a hot air gun. However, the hot air gun uses an electric heating wire to heat the airflow, which is then guided through the nozzle. This type of device is strictly prohibited in hazardous work areas because the electric heating wire is exposed to the air and generates an ignition source during heating. Methods that use oil baths or water baths to heat the air have problems such as inaccurate temperature control and low work efficiency, making them unsuitable for use in explosion-proof work environments. A search revealed that there are currently no explosion-proof, anti-static, and constant-temperature hot air gun devices in the industry. Existing methods such as electric heating, oil baths, and water baths have low waste heat heating efficiency and cannot solve the problem of heat shrink tubing heat shrinking in explosion-proof environments. Summary of the Invention

[0003] To overcome the bottleneck problems of existing hot air guns being unable to operate directly in explosion-proof work areas and having low working efficiency when using residual heat from metal or heating air with oil or water baths, this invention proposes an explosion-proof hot air gun suitable for use in hazardous, explosion-proof, and anti-static environments. Furthermore, by combining heating components and air resistance plates, the working efficiency of the hot air is improved.

[0004] The technical solution of the present invention is implemented as follows: an explosion-proof hot air gun includes a hot air gun body, the hot air gun body includes a shell, a sealing cover, a heating component and a wind resistance plate are arranged sequentially along the axis inside the shell, the wind resistance plate is provided with hot air guide holes, the wind resistance plate is connected to a grounding wire, the heating component includes an explosion-proof base disposed inside the shell, explosion-proof housings are evenly distributed along the circumference of the explosion-proof base, a heating core is disposed inside the explosion-proof housing, and cold air guide holes are also evenly distributed along the circumference of the explosion-proof base.

[0005] Furthermore, the cold air guide hole is inclined outward along the axial direction and is located on the side of the explosion-proof housing away from the outer shell.

[0006] Furthermore, an insulating shell is also provided on the explosion-proof base. A temperature sensor is provided at one end of the insulating shell near the wind resistance plate. The connecting wire of the temperature sensor passes through the insulating shell, through the explosion-proof base, and is connected to the first terminal block.

[0007] Furthermore, the heating element passes through the explosion-proof base and is connected to the second terminal block, which is sealed with high-temperature resistant silicone rubber.

[0008] Furthermore, the sealing cover is also provided with a power inlet hole, a signal inlet hole, and an air inlet hole. The air inlet hole is connected to the cold air guide hole, and the signal inlet hole and the air inlet hole are the same hole.

[0009] Furthermore, a wind cap is provided at one end of the outer casing near the wind resistance plate. The wind cap includes a variable diameter air duct. One end of the variable diameter air duct is detachably connected to the outer casing, and the other end is provided with a conical air outlet.

[0010] Furthermore, the inner wall of the outer shell is lined with heat-insulating asbestos.

[0011] Furthermore, the heating element is a stainless steel ceramic heating element.

[0012] Furthermore, a handheld casing is also fitted on the outside of the outer shell.

[0013] Furthermore, it also includes a control box, which is equipped with a temperature display, an input power supply, a compressed air pipe, an output composite pipe, and a hot air gun base. The control box contains a controller, which is connected to the hot air gun body through the output composite pipe. The hot air gun body is placed on the hot air gun base. The input power supply is connected to the controller through an isolation transformer. The compressed air pipe is connected to the controller through a solenoid valve. The temperature sensor is connected to the controller through a signal line.

[0014] The beneficial effects of this invention are:

[0015] The explosion-proof hot air gun of the present invention can be used for heat shrinking operations in hazardous work areas, specifically: first, for wire welding heat shrinking operations in work areas with anti-static requirements; second, for wire welding heat shrinking operations in the assembly of pyrotechnic products in the defense industry system; and third, for wire welding heat shrinking operations in explosion-proof and anti-static hazardous work environments in other industries.

[0016] The combination of the explosion-proof shell and the explosion-proof base of this invention isolates the heating element from the external environment, such as air, to prevent heating and static electricity, thus achieving explosion protection. The cold air guide hole is inclined to facilitate the generation of eddies in the compressed air inside the shell, allowing the explosion-proof shell to dissipate heat and form hot air. The hot air is concentrated by the wind resistance plate, improving heating efficiency and achieving heating without open flame and with controllable temperature. The wind resistance plate is grounded to prevent the formation of static electricity and reduce safety risks. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1This is a schematic diagram of the structure of the hot air gun body;

[0019] Figure 2 for Figure 1 Sectional view of BB;

[0020] Figure 3 This is a schematic diagram of the internal structure of the heating element;

[0021] Figure 4 This is a 3D view of the heating element;

[0022] Figure 5 This is a three-dimensional view of the outer shell;

[0023] Figure 6 This is a bottom view of the outer casing;

[0024] Figure 7 This is a schematic diagram of the control box.

[0025] Figure 8 Block diagram of the working principle of a hot air gun

[0026] 1. Hot air gun body; 2. Outer shell; 3. Insulating asbestos; 4. Sealing cover; 5. Air resistance plate; 6. Hot air guide hole; 7. Explosion-proof base; 8. Heating core; 9. Explosion-proof housing; 10. Second terminal block; 11. High-temperature resistant silicone rubber; 12. Cold air guide hole; 13. Air cap; 14. Insulating shell; 15. Temperature sensor; 16. First terminal block; 17. Power inlet hole; 18. Air inlet hole; 19. Control box; 20. Operation button; 21. Temperature display; 22. Input power supply; 23. Compressed air pipe; 24. Output composite pipeline; 25. Hot air gun base; 26. Signal line; 27. Compressed air pipeline; 28. Heating power cord; 29. ​​Handheld housing. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Example 1

[0029] like Figure 1-5 As shown, an explosion-proof hot air gun includes a hot air gun body 1, which includes a housing 2. Insulating asbestos 3 is fixed to the inner wall of the housing 2. A sealing cover 4, a heating element, and a wind resistance plate 5 are sequentially arranged along the axis inside the housing 2. Figure 6As shown, the wind resistance plate 5 has multiple hot air guide holes 6 distributed on it, and the wind resistance plate 5 is connected to the grounding wire. The heating assembly includes an explosion-proof base 7 fixed inside the outer shell 2. Eight explosion-proof housings 9 are evenly distributed along the circumference of the explosion-proof base 7, and the explosion-proof housings 9 are located between the wind resistance plate 5 and the explosion-proof base 7. Each explosion-proof housing 9 contains a heating core 8, so there are a total of eight parallel heating cores 8. The outer side of each heating core 8 is tightly fitted to the explosion-proof housing 9. The heating core 8 is a stainless steel ceramic heating core, which can be purchased commercially. The stainless steel ceramic heating core 8 includes a ceramic heating element, and the outer side of the ceramic heating element is fixed with stainless steel to prevent the ceramic from falling off.

[0030] The explosion-proof housing 9 and the explosion-proof base 7 are fixedly connected. Both the explosion-proof housing 9 and the explosion-proof base 7 are precision-machined from aluminum alloy. The explosion-proof housing 9 and the explosion-proof base 7 effectively isolate the heating element 8 from the outside environment, preventing it from becoming electrically charged. The heating element 8 passes through the explosion-proof base 7 and is connected to the second terminal 10. The second terminal 10 is sealed with high-temperature resistant silicone rubber 11 to prevent electrical wiring from being exposed to the air.

[0031] Eight cold air guide holes 12 are evenly distributed along the circumference of the explosion-proof base 7. Optimally, the cold air guide holes 12 are inclined outward along the axial direction and located on the side of the explosion-proof housing 9 away from the outer shell 2. The inclined arrangement of the cold air guide holes 12 facilitates the generation of vortices in the cavity of the outer shell 2 with compressed air, allowing the explosion-proof housing 2 to dissipate heat fully and reach the set temperature of hot air. A wind cap 13 is provided at the end of the outer shell 2 near the wind deflector 5. The wind cap 13 includes a variable diameter air duct. One end of the variable diameter air duct is fitted onto the outer shell 2, and the other end is a conical air outlet. The conical air outlet concentrates the airflow, reducing air dispersion and allowing for rapid contraction of the heat shrink tubing. The variable diameter air duct is detachably fitted onto the outer shell 2, facilitating the replacement of the wind cap 13 as needed. A handheld housing 29 is also fitted and fixed to the outside of the outer shell 2. The handheld housing 29 adopts a burn-proof structure and is made of hard plastic to reduce occupational injuries.

[0032] The method of using the explosion-proof hot air gun is as follows: Compressed air enters the cavity of the outer shell 2 through the cold air guide hole 12 and blows onto the explosion-proof shell 9, quickly blowing away the heat generated by the heating core 8 to form hot air. The hot air is heated by the air resistance plate 5 and discharged through the hot air guide hole 6, and finally blown out through the conical air outlet. The cooperation between the explosion-proof shell 2 and the explosion-proof base 7 isolates the heating core 8 from the air and other external environments to prevent the heating element from generating static electricity and achieve explosion protection. The air resistance plate 5 is grounded to prevent the formation of static electricity and reduce safety risks.

[0033] Example 2

[0034] This embodiment is basically the same as Embodiment 1, except that, as Figure 2-4As shown, an insulating shell 14 is also fixed in the middle of the explosion-proof base 7. A temperature sensor 15 is installed at one end of the insulating shell 14 near the wind resistance plate 5. The connecting wire of the temperature sensor 15 passes through the insulating shell 14, through the explosion-proof base 7, and is connected to the first terminal 16. The temperature sensor 15 is used to detect the temperature of the hot air in real time and feed it back to the temperature display 21. When the required temperature is reached, the heat shrink tubing at the welding position is heat-shrinked using a handheld hot air gun.

[0035] The sealing cover 4 is also provided with a power inlet hole 17, a signal line inlet hole and an air inlet hole 18. The air inlet hole 18 is connected to the cold air guide hole 12. The signal line inlet hole and the air inlet hole 18 are the same hole and are located in the middle of the sealing cover 4. Compressed air enters the cold air guide hole 12 through the air inlet hole 18.

[0036] Example 3

[0037] This embodiment is basically the same as embodiment 2, except that, as Figure 2 , 7 As shown in Figure 8, an explosion-proof hot air gun also includes a control box 19. The control box 19 is equipped with an operation button 20, a temperature display 21, an input power supply 22, a compressed air pipe 23, an output composite pipeline 24, and a hot air gun base 25. The control box 19 contains a controller, which is a single-chip microcomputer. The input power supply 22 is connected to the controller through an isolation transformer. The 220V input power supply 22 outputs a safe voltage of 24V-10A through the isolation transformer as a safe heating power supply. Then, the heating power is controlled by the single-chip microcomputer controlling the thyristor.

[0038] Compressed air is used as the air source. Compressed air pipe 23 is connected to the controller via a solenoid valve, which controls the on / off switching of the air source. Temperature sensor 15 is connected to the controller via signal line 26, and the controller is connected to temperature display 21. The controller is connected to the hot air gun body 1 via output composite line 24, and the hot air gun body 1 is placed on the hot air gun base 25. Figure 2 As shown, the output composite pipeline 24 includes a signal line 26, a compressed air pipeline 27, and a heating power supply line 28. The compressed air pipeline 27 is connected to the air inlet 18. The heating power supply line 28 is connected to the heating element through the power inlet 17. The signal line 26 of the temperature sensor 15 is connected to the first terminal 16 through the signal inlet. The output composite pipeline 24 is made of stainless steel corrugated tubing, which meets the safety requirements for explosion-proof workplaces. After the hot air gun is used up, press the stop button to turn off the heating. The solenoid valve will work for 20 seconds after a delay to quickly lower the internal temperature and prevent burns to the operator.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An explosion-proof hot air gun, comprising a hot air gun body, the hot air gun body including a shell, characterized in that: The outer casing is provided with a sealing cover, a heating component and a wind resistance plate arranged in sequence along the axis. The wind resistance plate is provided with hot air guide holes and is connected to the grounding wire. The heating component includes an explosion-proof base set inside the outer casing. Explosion-proof shells are evenly distributed around the upper edge of the explosion-proof base. A heating core is set inside the explosion-proof shell. Cold air guide holes are also evenly distributed around the upper edge of the explosion-proof base.

2. The explosion-proof hot air gun according to claim 1, characterized in that: The cold air guide hole is inclined outward along the axial direction and is located on the side of the explosion-proof housing away from the outer shell.

3. An explosion-proof hot air gun according to claim 1 or 2, characterized in that: An insulating shell is also installed on the explosion-proof base. A temperature sensor is installed at one end of the insulating shell near the wind resistance plate. The connecting wire of the temperature sensor passes through the insulating shell, through the explosion-proof base, and is connected to the first terminal.

4. The explosion-proof hot air gun according to claim 1, characterized in that: The heating element passes through the explosion-proof base and is connected to the second terminal block, which is sealed with high-temperature resistant silicone rubber.

5. The explosion-proof hot air gun according to claim 3, characterized in that: The sealing cover is also equipped with a power inlet hole, a signal cable inlet hole, and an air inlet hole. The air inlet hole is connected to the cold air guide hole, and the signal cable inlet hole and the air inlet hole are the same hole.

6. The explosion-proof hot air gun according to claim 1, characterized in that: A wind cap is provided at one end of the outer casing near the wind resistance plate. The wind cap includes a variable diameter air duct. One end of the variable diameter air duct is detachably connected to the outer casing, and the other end is provided with a conical air outlet.

7. The explosion-proof hot air gun according to claim 1, characterized in that: The inner wall of the outer shell is lined with heat-insulating asbestos.

8. The explosion-proof hot air gun according to claim 1, characterized in that: The heating element is a stainless steel ceramic heating element.

9. The explosion-proof hot air gun according to claim 1, characterized in that: The outer shell is also fitted with a handheld casing.

10. The explosion-proof hot air gun according to claim 3, characterized in that: It also includes a control box, which is equipped with a temperature display, input power supply, compressed air pipe, output composite pipe and hot air gun base. The control box contains a controller, which is connected to the hot air gun body through the output composite pipe. The hot air gun body is placed on the hot air gun base. The input power supply is connected to the controller through an isolation transformer. The compressed air pipe is connected to the controller through a solenoid valve. The temperature sensor is connected to the controller through a signal line.

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