Hot air plastic welding gun

Abstract

The invention relates to the technical field of plastic welding, in particular to a hot air plastic welding gun which comprises a power connection control mechanism, a central air conveying mechanism and a multi-channel temperature increasing mechanism, the central air conveying mechanism is installed at the upper end of the power connection control mechanism, and a heat insulation air guide mechanism is installed at the upper end of the central air conveying mechanism; a multi-channel temperature increasing mechanism is installed on the inner side of the heat insulation air guide mechanism. The power connection control mechanism comprises a ventilation bottom cover. By adopting the square brushless motor, the installation gap can be effectively enlarged, maintenance, disassembly and assembly are convenient, dust accumulation is avoided, air is conveniently and uniformly heated and intensively output through diversion of multiple channels, and the plastic welding speed and quality are effectively improved; the problems that according to an existing hot air welding gun, a cylindrical brushless motor is used for conveying air, the installation gap of the brushless motor is small, disassembly, assembly and overhaul are inconvenient, dust is prone to being accumulated, airflow is inconvenient to evenly heat, the heating effect is poor, and the welding quality and the welding speed are affected are solved.

Description

Technical Field

[0001] The invention relates to the technical field of plastic welding, in particular to a hot air plastic welding gun. Background Art

[0002] Plastic welding refers to the process of softening and melding the surface layers of two plastic parts with the help of direct or indirect heat sources, generating van der Waals forces between the macromolecules in the hot melt state, and welding them tightly together, and then cooling and solidifying to obtain a weld with sufficient strength. There are many current methods for plastic welding, among which hot air welding is a relatively widely used welding method in plastic welding. At present, hot air welding guns are mainly used for the welding of waterproof coils, PP boards, and environmental protection equipment.

[0003] The existing hot air welding gun uses a cylindrical brushless motor for air supply. The installation gap of the brushless motor is small, and it is inconvenient to disassemble and repair. It is easy to accumulate dust and it is not convenient to heat the airflow evenly. The heating effect is poor, which affects the welding quality and speed. Therefore, it does not meet the existing needs. We have proposed a hot air plastic welding gun. Summary of the invention

[0004] The object of the present invention is to provide a hot air plastic welding gun to solve the problem proposed in the above background technology that the existing hot air welding gun uses a cylindrical brushless motor for air supply, the installation gap of the brushless motor is small, disassembly and maintenance are inconvenient, dust is easily accumulated, and it is not convenient to heat the airflow evenly, the heating effect is poor, and the welding quality and speed are affected.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a hot air plastic welding gun, comprising an electric control mechanism, a central air supply mechanism and a multi-channel temperature increasing mechanism, wherein the upper end of the electric control mechanism is provided with a central air supply mechanism, the upper end of the central air supply mechanism is provided with a heat-insulating air guide mechanism, the inner side of the heat-insulating air guide mechanism is provided with a multi-channel temperature increasing mechanism, the electric control mechanism comprises a ventilated bottom cover, the upper end of the ventilated bottom cover is fixedly provided with a protective tail shell, the central air supply mechanism comprises a locking sleeve, the locking sleeve is connected to the upper end of the protective tail shell by a thread, the inner side of the locking sleeve is provided with a motor mounting sleeve, the inner side of the motor mounting sleeve is provided with a square brushless motor, the inner side of the square brushless motor is rotatably connected with a motor rotor, and the upper and lower ends of the motor rotor are provided with air supply fan blades;

[0006] The multi-channel heating mechanism includes an air guide column, a limited air guide plate is installed on the upper end of the air guide column, a ventilation mounting seat is installed on the inner side of the bottom end of the air guide column, a uniform fan blade is rotatably connected between the ventilation mounting seat and the air guide column, a plurality of heating strips are installed on the inner side of the air guide column, a plurality of arc-shaped guide channels are arranged between the air guide column and the heating strips, a central guide channel is arranged at the center of the air guide column, and a collecting hole is arranged at the upper ends of the central guide channel and the plurality of arc-shaped guide channels.

[0007] Preferably, the power control mechanism also includes a handle shell that is snap-fitted to the protective tail shell, a power mounting seat is installed on the upper end surface of the ventilated bottom cover, a circuit board is fixedly installed on one side of the power mounting seat, and a cable mounting sleeve is fixedly installed on the inner side of the ventilated bottom cover.

[0008] Preferably, the heat-insulating air-guiding mechanism comprises a conical limiting sleeve, the bottom end of the conical limiting sleeve is fixedly connected to the motor mounting sleeve, the upper end surface of the conical limiting sleeve is installed with a pressure ring, the upper end surface of the pressure ring is installed with a heat-insulating sleeve, and the inner side of the heat-insulating sleeve is installed with an air-guiding duct.

[0009] Preferably, a square mounting hole is provided on the inner side of the motor mounting sleeve, the square brushless motor is plugged into the inner side of the square mounting hole, the upper end of the power connection mounting seat is connected to the motor mounting sleeve through the square brushless motor, a motor stator is provided inside the square brushless motor, the motor stator is electrically connected to the circuit board, a switch knob is provided on the lower end surface of the ventilated bottom cover, and the circuit board is electrically connected to the switch knob.

[0010] Preferably, the upper end of the protective tail shell is fixed to the bottom end of the motor mounting sleeve by screws, the locking sleeve is threadedly connected to the conical limit sleeve, the locking sleeve is rotatably connected to the motor mounting sleeve, a motor shaft is provided in the middle of the motor rotor, the two fan blades are fixedly connected to both ends of the motor shaft, and the rotation directions of the two fan blades are consistent.

[0011] Preferably, the pressure ring and the conical limit sleeve are connected and fixed by screws, the bottom end of the air guide column is inserted between the conical limit sleeve and the pressure ring, the air guide column and the conical limit sleeve are fixedly connected by the pressure ring, and the bottom end of the air-permeable mounting seat is inserted into the inner side of the middle part of the air guide column.

[0012] Preferably, the insulation sleeve is fixedly connected to the pressure ring, the bottom end of the air duct passes through the insulation sleeve and is welded and fixed to the pressure ring, the upper end face of the air duct is provided with a ventilation filter plate, and the collecting hole and the ventilation filter plate are connected through a limiting air guide plate.

[0013] Preferably, a limiting ring is fixedly provided on the inner wall of the upper end of the air guide pipe, the upper end surface of the limiting air guide piece is in close contact with the limiting ring, the limiting air guide piece is slidably connected to the air guide column, and the material of the limiting air guide piece is alloy.

[0014] Preferably, the air-permeable mounting seat is connected to the bottom end of the air-guiding column by threads, an air-uniform cavity is provided between the air-guiding column and the air-permeable mounting seat, and the air-uniform fan blades are provided on the inner side of the air-uniform cavity.

[0015] Preferably, the collecting hole and the uniform air chamber are connected through a central guide channel and a plurality of arc-shaped guide channels, the plurality of heating strips and arc-shaped guide channels are arranged in a circle relative to the axis of the central guide channel, an electric heating resistance wire is provided inside the heating strip, and the heating strip is electrically connected to the circuit board.

[0016] The present invention provides a square mounting hole on the inner side of the motor mounting sleeve, so that the square brushless motor is arranged on the inner side of the square mounting hole and the square brushless motor is fixed and locked by the ventilated bottom cover and the power connection mounting seat, thereby facilitating the increase of the mounting gap between the motor mounting sleeve and the square brushless motor and facilitating the disassembly and assembly of the square brushless motor, thereby preventing excessive dust accumulation on the square brushless motor from affecting the efficiency of hot air output. The motor stator provided inside the square brushless motor drives the motor rotor to rotate, and then the motor rotor drives the two fan blades to rotate synchronously, thereby realizing the extraction of external air to the inner side of the conical limiting sleeve through the ventilated bottom cover and the power connection mounting seat, thereby increasing the air volume of the hot air welding gun.

[0017] The present invention can evenly disperse the airflow through the fan blades, thereby facilitating the simultaneous airflow guidance operation through the central guide channel and the multiple curved guide channels; the air guide column can be evenly heated through the multiple temperature increasing strips, thereby facilitating the air guide column to evenly heat the airflow during the heat conduction process, effectively improving the heating rate of the airflow; the hot air flows inside the central guide channel and the multiple curved guide channels can be collected and transported through the collecting holes, which is convenient for the concentrated flow of hot air, reduces the heating area when the hot air is output from the upper end of the air guide pipe, and improves the plastic welding rate and quality. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0019] Figure 2 It is a schematic cross-sectional structure diagram of the present invention as a whole;

[0020] Figure 3 It is a schematic diagram of the explosion structure of the present invention as a whole;

[0021] Figure 4 It is a schematic cross-sectional structure diagram of the multi-channel temperature increasing mechanism of the present invention;

[0022] Figure 5 It is a schematic diagram of the cross-sectional structure of the air guide column of the present invention;

[0023] Figure 6 It is a schematic diagram of the explosion structure of the multi-channel temperature increasing mechanism of the present invention;

[0024] Figure 7 It is a schematic diagram of the explosion structure of the central air supply mechanism of the present invention. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0026] See also Figures 1 to 3 A hot air plastic welding gun provided by the present invention includes an electrical control mechanism 1, a central air supply mechanism 2 and a multi-channel heating mechanism 4, the electrical control mechanism 1 includes a ventilated bottom cover 104, a protective tail shell 102 is fixedly installed on the upper end of the ventilated bottom cover 104, the electrical control mechanism 1 also includes a handle shell 101 snap-fitted with the protective tail shell 102, an electrical connection mounting seat 105 is installed on the upper end surface of the ventilated bottom cover 104, a circuit board 106 is fixedly installed on one side of the electrical connection mounting seat 105, a cable installation sleeve 103 is fixedly installed on the inner side of the ventilated bottom cover 104, and the circuit board 106 is conveniently protected and insulated by the ventilated bottom cover 104 and the protective tail shell 102.

[0027] See also Figure 2 , Figure 3 and Figure 7 A central air delivery mechanism 2 is installed at the upper end of the power-connected control mechanism 1, and the central air delivery mechanism 2 includes a locking sleeve 201, and the locking sleeve 201 is connected to the upper end of the protective tail shell 102 by threads. A motor mounting sleeve 202 is installed on the inner side of the locking sleeve 201, and the locking sleeve 201 is rotatably connected to the motor mounting sleeve 202. The upper end of the protective tail shell 102 is fixed to the bottom end of the motor mounting sleeve 202 by screws, and a square brushless motor 203 is installed on the inner side of the motor mounting sleeve 202. A square mounting hole is provided on the inner side of the motor mounting sleeve 202, and the square brushless motor 203 is plugged into the inner side of the square mounting hole, which is convenient for increasing the installation gap between the motor mounting sleeve 202 and the square brushless motor 203 and for disassembling and assembling the square brushless motor 203, so as to avoid excessive dust accumulation on the square brushless motor 203 affecting the efficiency of hot air output;

[0028] The upper end of the power connection mounting seat 105 is connected to the motor mounting sleeve 202 through the square brushless motor 203, the inner side of the square brushless motor 203 is rotatably connected to the motor rotor 204, and the upper and lower ends of the motor rotor 204 are installed with fan blades 205. The interior of the square brushless motor 203 is provided with a motor stator, and the motor stator is electrically connected to the circuit board 106. The lower end surface of the ventilated bottom cover 104 is provided with a switch knob, and the circuit board 106 is electrically connected to the switch knob. The middle part of the motor rotor 204 is provided with a motor shaft, and the two fan blades 205 are fixedly connected to the two ends of the motor shaft. The rotation direction of the two fan blades 205 is consistent, and the square brushless motor 203 synchronously drives the fan blades 205 to rotate through the motor rotor 204 to increase the ventilation volume of the hot air welding gun.

[0029] See also Figures 1 to 3 A heat-insulating air-guiding mechanism 3 is installed at the upper end of the central air delivery mechanism 2, and the heat-insulating air-guiding mechanism 3 includes a conical limiting sleeve 301, the locking sleeve 201 is connected to the conical limiting sleeve 301 by threads, the bottom end of the conical limiting sleeve 301 is fixedly connected to the motor mounting sleeve 202, and a pressing ring 304 is installed on the upper end surface of the conical limiting sleeve 301, and the pressing ring 304 is fixedly connected to the conical limiting sleeve 301 by screws, and a heat-insulating sleeve 302 is installed on the upper end surface of the pressing ring 304, and an air-guiding duct 303 is installed on the inner side of the heat-insulating sleeve 302, and the heat-insulating sleeve 302 is fixedly connected to the pressing ring 304, and the bottom end of the air-guiding duct 303 passes through the heat-insulating sleeve 302 and is welded and fixed to the pressing ring 304, and the air-guiding duct 303 is insulated and protected by the heat-insulating sleeve 302, so that the air-guiding duct 303 can output hot air.

[0030] See also Figures 2 to 6 A multi-channel temperature increasing mechanism 4 is installed on the inner side of the heat-insulating air-guiding mechanism 3, and the multi-channel temperature increasing mechanism 4 includes an air-guiding column 401. The bottom end of the air-guiding column 401 is inserted between the conical limiting sleeve 301 and the pressure ring 304. The air-guiding column 401 and the conical limiting sleeve 301 are fixedly connected through the pressure ring 304. A limited air-guiding piece 402 is installed on the upper end of the air-guiding column 401. A limiting ring is fixedly provided on the inner wall of the upper end of the air-guiding pipe 303. The upper end surface of the limited air-guiding piece 402 is in contact with the limiting ring. The limited air-guiding piece 402 is slidably connected to the air-guiding column 401. The material of the limited air-guiding piece 402 is alloy. The limited air-guiding piece 402 is used to facilitate the positioning and installation of the air-guiding column 401 to avoid the rotation of the air-guiding column 401.

[0031] A ventilation mounting seat 403 is installed on the inner side of the bottom end of the air guide column 401, and the bottom end of the ventilation mounting seat 403 is plugged into the inner side of the middle part of the air guide column 401. A uniform fan blade 404 is rotatably connected between the ventilation mounting seat 403 and the air guide column 401. The ventilation mounting seat 403 and the bottom end of the air guide column 401 are connected by threads. An air uniforming cavity is provided between the air guide column 401 and the ventilation mounting seat 403. The uniform fan blade 404 is arranged on the inner side of the air uniforming cavity, and the airflow can be evenly dispersed by the uniform fan blade 404.

[0032] A plurality of temperature increasing strips 408 are installed on the inner side of the air guide column 401, and an electric heat resistance wire is arranged inside the temperature increasing strip 408. The temperature increasing strip 408 is electrically connected to the circuit board 106. A plurality of arc-shaped flow guiding channels 406 are arranged between the air guide column 401 and the temperature increasing strip 408. A central flow guiding channel 405 is arranged at the center of the air guide column 401. A collecting hole 407 is arranged at the upper end of the central flow guiding channel 405 and the plurality of arc-shaped flow guiding channels 406. A ventilation filter plate is arranged on the upper end surface of the air guide pipe 303. The collecting hole 407 is provided at the upper end surface of the air guide pipe 303. 7 is connected with the ventilation filter plate through the limiting air guide piece 402, the collecting hole 407 is connected with the uniform air chamber through the central guide channel 405 and the plurality of arc-shaped guide channels 406, the plurality of temperature-increasing strips 408 and the arc-shaped guide channels 406 are arranged in a circle relative to the axis of the central guide channel 405, and the air guide column 401 can be evenly heated by the plurality of temperature-increasing strips 408, so that the air guide column 401 can evenly heat the airflow during the heat conduction process, thereby effectively improving the heating rate of the airflow.

[0033] When in use, the air guide column 401 is inserted into the inner side of the air guide duct 303 and connected to the air guide duct 303 through the limiting air guide piece 402, and the bottom end of the air guide column 401 is fixedly connected to the conical limiting sleeve 301 through the pressing ring 304, the protective tail shell 102 and the conical limiting sleeve 301 are both fixedly connected to the motor mounting sleeve 202, and a square mounting hole is provided on the inner side of the motor mounting sleeve 202, so that the square brushless motor 203 is arranged on the inner side of the square mounting hole and the square brushless motor 203 is fixed and locked through the ventilated bottom cover 104 and the power connection mounting seat 105, thereby facilitating the increase of the installation gap between the motor mounting sleeve 202 and the square brushless motor 203 and facilitating the disassembly and assembly of the square brushless motor 203, thereby avoiding excessive dust accumulation on the square brushless motor 203 affecting the efficiency of hot air output.

[0034] When the power is turned on, a switch knob is provided at the bottom end of the ventilated bottom cover 104. The switch knob is operated to control the power connection of the square brushless motor 203 through the circuit board 106, so that the motor stator provided inside the square brushless motor 203 drives the motor rotor 204 to rotate, and then the motor rotor 204 drives the two fan blades 205 to rotate synchronously, so that the external air is drawn to the inner side of the conical limiting sleeve 301 through the ventilated bottom cover 104 and the power connection mounting seat 105, and the bottom end of the air guide column 401 is connected to the ventilated mounting seat 403 by threads, and a uniform air cavity is provided between the air guide column 401 and the ventilated mounting seat 403, so that the two fan blades 205 can quickly push the external air and transport it to the inner side of the uniform air cavity through the guide of the ventilated mounting seat 403.

[0035] Uniform fan blades 404 are provided on the inner side of the uniform air chamber, so that the airflow can be evenly dispersed by the uniform fan blades 404, thereby facilitating the simultaneous airflow guidance operation through the central guide channel 405 and the multiple arc-shaped guide channels 406. The air guide column 401 can be evenly heated by the multiple temperature-increasing strips 408, thereby facilitating the air guide column 401 to evenly heat the airflow during the heat conduction process, thereby effectively improving the heating rate of the airflow.

[0036] The upper end of the air guide duct 303 is connected to the collecting hole 407 through the limiting air guide plate 402, so that the hot air flow inside the central guide channel 405 and the multiple arc-shaped guide channels 406 can be collected and transported through the collecting hole 407, which facilitates the concentrated flow of hot air, reduces the heating area when the hot air is output from the upper end of the air guide duct 303, and improves the plastic welding rate and quality.

[0037] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

Claims

1. A hot air plastic welding gun, comprising a power connection control mechanism, a central air supply mechanism and a multi-channel temperature increase mechanism, characterized in that: A central air delivery mechanism is installed at the upper end of the power connection control mechanism, a heat insulation air guide mechanism is installed at the upper end of the central air delivery mechanism, a multi-channel temperature increasing mechanism is installed on the inner side of the heat insulation air guide mechanism, the power connection control mechanism includes a ventilated bottom cover, a protective tail shell is fixedly installed on the upper end of the ventilated bottom cover, the central air delivery mechanism includes a locking sleeve, the locking sleeve is connected to the upper end of the protective tail shell by threads, a motor mounting sleeve is installed on the inner side of the locking sleeve, a square brushless motor is installed on the inner side of the motor mounting sleeve, a motor rotor is rotatably connected to the inner side of the square brushless motor, and air delivery fan blades are installed on both the upper and lower ends of the motor rotor; The multi-channel heating mechanism includes an air guide column, a limited air guide plate is installed on the upper end of the air guide column, a ventilation mounting seat is installed on the inner side of the bottom end of the air guide column, a uniform fan blade is rotatably connected between the ventilation mounting seat and the air guide column, a plurality of heating strips are installed on the inner side of the air guide column, a plurality of arc-shaped guide channels are arranged between the air guide column and the heating strips, a central guide channel is arranged at the center of the air guide column, and a collecting hole is arranged at the upper ends of the central guide channel and the plurality of arc-shaped guide channels.

2. The hot air plastic welding gun according to claim 1, characterized in that: The power control mechanism also includes a handle shell that is snap-fitted to the protective tail shell, a power mounting seat is installed on the upper end surface of the ventilated bottom cover, a circuit board is fixedly installed on one side of the power mounting seat, and a cable mounting sleeve is fixedly installed on the inner side of the ventilated bottom cover.

3. The hot air plastic welding gun according to claim 2, characterized in that: The heat-insulating air-guiding mechanism comprises a conical limiting sleeve, the bottom end of which is fixedly connected to the motor mounting sleeve, the upper end surface of the conical limiting sleeve is provided with a pressing ring, the upper end surface of the pressing ring is provided with a heat-insulating sleeve, and the inner side of the heat-insulating sleeve is provided with an air-guiding duct.

4. The hot air plastic welding gun according to claim 3, characterized in that: A square mounting hole is provided on the inner side of the motor mounting sleeve, and the square brushless motor is plugged into the inner side of the square mounting hole. The upper end of the power connection mounting seat is connected to the motor mounting sleeve through the square brushless motor. A motor stator is provided inside the square brushless motor, and the motor stator is electrically connected to the circuit board. A switch knob is provided on the lower end surface of the ventilated bottom cover, and the circuit board is electrically connected to the switch knob.

5. The hot air plastic welding gun according to claim 4, characterized in that: The upper end of the protective tail shell is fixed to the bottom end of the motor mounting sleeve by screws, the locking sleeve is connected to the conical limit sleeve by threads, the locking sleeve is rotatably connected to the motor mounting sleeve, a motor shaft is provided in the middle of the motor rotor, the two fan blades are fixedly connected to both ends of the motor shaft, and the rotation directions of the two fan blades are consistent.

6. The hot air plastic welding gun according to claim 3, characterized in that: The pressure ring and the conical limiting sleeve are connected and fixed by screws, the bottom end of the air guide column is inserted between the conical limiting sleeve and the pressure ring, the air guide column and the conical limiting sleeve are fixedly connected by the pressure ring, and the bottom end of the air-permeable mounting seat is inserted into the inner side of the middle part of the air guide column.

7. The hot air plastic welding gun according to claim 6, characterized in that: The heat insulation sleeve is fixedly connected to the pressure ring, the bottom end of the air duct passes through the heat insulation sleeve and is welded and fixed to the pressure ring, the upper end face of the air duct is provided with a ventilation filter plate, and the collecting hole is through-connected with the ventilation filter plate via a limiting air guide piece.

8. The hot air plastic welding gun according to claim 7, characterized in that: A limiting ring is fixedly provided on the inner wall of the upper end of the air guide pipe, the upper end surface of the limiting air guide piece is in close contact with the limiting ring, the limiting air guide piece is slidably connected to the air guide column, and the material of the limiting air guide piece is alloy.

9. The hot air plastic welding gun according to claim 8, characterized in that: The ventilation mounting seat is connected to the bottom end of the air guide column through threads, an air uniformity cavity is arranged between the air guide column and the ventilation mounting seat, and the air uniformity fan blades are arranged on the inner side of the air uniformity cavity.

10. The hot air plastic welding gun according to claim 9, characterized in that: The collecting hole and the uniform air chamber are connected through a central guide channel and a plurality of arc-shaped guide channels. The plurality of heating strips and the arc-shaped guide channels are arranged in a circle relative to the axis of the central guide channel. An electric heating resistance wire is provided inside the heating strip, and the heating strip is electrically connected to the circuit board.

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