Low-center-of-gravity high-wind-speed easy-to-operate plastic welding gun

Abstract

The application provides a low-barycenter high-wind-speed easy-to-operate plastic welding gun, which comprises a gun body mechanism, a welding gun handle, a super-high full-pressure centrifugal fan, a wire feeding transmission mechanism and a high-temperature heat transfer heating mechanism. The gun body mechanism is integrated with an electric heating wire, a cooling air duct and a wire feeding system, the motor and the pipeline are cooled by parallel cooling air, and the safety and stability are improved. The fan adopts a combined structure of oblique wind-encountering blades and semicircular arc wind-catching blades, cooperates with a sound-absorbing cover and a concave-convex sponge to realize efficient noise reduction. In the high-temperature heat transfer mechanism, the high-temperature airflow is formed by the cooling air flowing through the center hole of the electric heating wire, the heat is transferred to the gun head softening area through the ceramic support and the high-density heat absorption pipe, the cross-shaped material breaking knife and the preheating exhaust hole are arranged in the gun head, and the uniform melting and extrusion of the welding wire are ensured. The wire feeding mechanism adopts a main and auxiliary gear pair bite + spring sheet pre-tightening structure to ensure that the welding wire is not slippery and is stably fed. The overall structure is compact, the barycenter is low, the operation is flexible, and the welding gun has the advantages of high wind speed, high temperature, low noise, easy operation and the like.

Description

Technical Field

[0001] This invention relates to the field of plastic welding equipment technology, and in particular to an easy-to-operate plastic welding gun with a low center of gravity and high wind speed. Background Technology

[0002] In the field of plastics processing and construction, welding large plastic sheets typically requires the use of specialized plastic welding guns. Traditional plastic welding guns have the following prominent problems: Firstly, traditional welding torches have a high center of gravity, with the handle and body on the same or nearly the same horizontal axis. When operators hold the torch for extended periods, their wrists and arms bear significant torque, easily leading to fatigue and affecting welding quality and work efficiency.

[0003] Secondly, traditional welding torches typically use ordinary centrifugal fans, which have insufficient air pressure and low air velocity. During the welding of large plastic sheets, high-temperature airflow is required to preheat and soften the weld. If the air pressure is insufficient, the high-temperature airflow cannot penetrate the weld surface effectively, resulting in slow welding speed and unstable welding quality.

[0004] Third, the coordination between the heating structure of the electric heating wire and the wire feeding and softening mechanism in traditional welding torches is not reasonable enough. The flow friction distance of the plastic welding wire in the high-temperature softening tube is relatively short, resulting in insufficient softening and limiting the wire feeding speed, thus restricting the improvement of welding efficiency.

[0005] Fourth, the noise problem of traditional welding torches is quite prominent. The high-speed rotating impeller generates sharp high-frequency noise during operation, which has an adverse effect on the hearing health of operators and the working environment.

[0006] Therefore, there is an urgent need to develop an innovative plastic welding torch that can reduce operator fatigue, increase welding speed, and improve the working environment. Summary of the Invention

[0007] This invention provides an easy-to-operate plastic welding torch with a low center of gravity and high wind speed, aiming to solve the problems existing in the prior art.

[0008] This plastic welding torch includes a torch body, which comprises a heating wire, a barrel, a cooling airflow exhaust pipe at the lower front end, and a welding torch handle. The main power inlet is located on the lower side of the handle, with a heating wire switch on the inner side and a wire feed geared motor switch on the inner side of the handle. The upper side of the handle features an adjustable locking tooth, and a fixing screw is located on the right side. The adjustable hollow fixing screw has a wire hole in the center, and a hollow outer hole for the fan power supply and geared motor power supply. The power cables for the fan and geared motor pass through the center of the adjustable handle fixing screw and connect to the motor. A wire feed motor switch is located inside the welding torch handle, and the high-pressure fan power supply is connected to a leakage protection plug. Another heating wire power cable passes through the adjustable connector, through the fixing connector of the torch handle, through the elbow hole of the cooling pipe, into the cold air cooling pipe, and connects to the heating wire connector. The heating wire barrel and the lower cooling parallel torch handle connecting pipe are connected by a butt-joint nut. The welding torch handle connects to the parallel lower cooling pipe and the ventilation pipe, forming a parallel lower cooling and ventilation system. The rear elbow connects to the upward exhaust pipe of the welding torch tube, and the outer ring of the front of the integral elbow ventilation pipe has an adjustable handle.

[0009] By placing the welding torch handle at the bottom of the torch body and making the handle angle adjustable and lockable, the center of gravity of operation is significantly lowered, which significantly reduces the stress on the wrist and arm during long-term operation, making operation easier and less strenuous.

[0010] Furthermore, the cooling air channel and high-temperature heating wire mechanism at the front of the barrel include: a high-pressure centrifugal fan is installed at the top of the front of the barrel, and airflow from its exhaust port enters the front barrel. A small cooling pipe for feeding plastic welding wire and a front cooling barrel are located in the middle of the cooling channel. The small cooling pipe is connected to the fixed cover of the plastic wire feeder gearbox, which is fixed with screws. Approximately one-third of the high-pressure cooling airflow in the barrel cooling channel enters the central hole of the high-temperature heating wire, immediately generating high-temperature airflow, which then enters the high-pressure airflow cooling and heat distribution channel. The high-temperature heating wire's hot airflow re-enters the heat absorption and heating device at the rear. This structure achieves precise separation and efficient mixing of the cooling and high-temperature airflows, ensuring stable high temperatures for the heating wire and providing sufficient high-temperature, high-pressure airflow for subsequent weld preheating.

[0011] Furthermore, the cooling mechanism air duct, high-temperature plastic softening mechanism, and the front side of the heating wire gun tube include: an enlarged inner ring of the heating wire gun tube is set behind the cooling gun tube, with a ceramic bracket for fixing the heating wire. A high-temperature heat transfer tube is set in the middle, with a plastic welding wire softening hole in the middle. Circular ceramic sleeve locking grooves are set at both ends of the outer ring to prevent lateral swinging between the ceramic sleeve bracket and the heating wire power connector and the heating wire vent safety gasket. The front end of the high-temperature heat transfer tube in the middle of the ceramic sleeve is connected to the wire feeding gearbox connection fixing cover, and the rear end is connected to the plastic welding wire heat dissipation tube, the welding gun cooling tube, and the gear fixing cover. The plastic welding wire softening hole is in the middle of the circular high-temperature heat transfer tube. This structure ensures that the plastic welding wire is fully cooled before entering the high-temperature softening zone, and at the same time obtains a sufficiently long softening stroke in the high-temperature zone, so that the welding wire softens quickly and evenly.

[0012] Furthermore, in the high-temperature heat transfer and heating mechanism, the other end of the high-temperature heat transfer tube between the gun barrel and the ceramic support of the heating wire is connected to the front side of the discharge hole in the middle of the gun head. A gun head fixing screw is provided on the outer ring of the front side of the welding gun head, connected to the discharge hole in the middle of the high-temperature gun head. Softened plastic at the middle end of the gun head is continuously fed into the gun head hole by hard plastic welding wire through two gears of the wire feeder, causing the softened plastic to be squeezed out from the high-temperature gun head hole. A high-temperature preheating exhaust hole for the plastic welding seam is provided on the front side of the gun head, and a high-temperature airflow baffle is located on the front side. A circular high-temperature airflow mixing and distribution channel is provided at the rear end of the ceramic support sleeve gasket of the heating wire, and a heat absorption and heating device is provided on the rear side. The heat absorption and heating device uses multiple high-density heat absorption and heating tubes, fixed by fixed connecting brackets at both ends. Multiple high-density heat absorption and heating tubes are connected as a whole, and a high-temperature heat transfer tube is also provided in the middle of the heat absorption and heating device, with a plastic friction flow softening hole in the center. A cross-shaped plastic cutting knife is provided inside the high-temperature softening hole on the front side of the high-temperature gun head. The high-temperature tube is connected to the nozzle and wire feeding gearbox. This structure, through the arrangement of multiple high-density heat-absorbing and heating tubes, allows the high-temperature airflow to be repeatedly heated by friction during its flow, so that the heat can be evenly concentrated and fully utilized, which not only improves thermal efficiency but also achieves energy-saving and power-saving effects.

[0013] Furthermore, the ultra-high pressure centrifugal fan, silencer mechanism, and impeller assembly include: the inner side of the rotating impeller housing and the inner side of the rear fixing ring of the impeller's windward blades are integrally connected with the inner side of the inclined windward blades and the semi-circular scoop blades and the inner side of the rear fixing ring. A windmill bushing is located in the middle of the rear fixing ring, with the fan motor shaft in the middle of the bushing driving the impeller's rotation. The front blades of the impeller are windward blades, and the front side of the scoop blades is fastened to the locking groove on the inner side of the front blade fixing ring, with the two fixing rings glued together to form a complete impeller. A protruding air intake is located in the middle of the front side of the rotating impeller, with a gap between it and the protruding baffle ring of the outer centrifugal fan housing. A circular arc-shaped silencer cover is located in front of the impeller air intake, with sound-absorbing textured sponge attached to the inner side. High-decibel sound generated inside the fan air intake is absorbed by the soft sponge. A silencer ring is located inside the silencer cover, with textured sponge attached to both the inner and outer rings. The inner side of the silencing ring is fixed to the outer side of the centrifugal fan casing. Multiple fixed support bars are located inside the arc-shaped silencer cover, and the bottom space around the perimeter forms the impeller's air intake channel. High-decibel sound generated at the impeller's air intake is absorbed by the soft sponge inside the silencer cover and cannot diffuse. This impeller structure, through the combination of the windward blades and the semi-circular scoop blades, generates an ultra-high total pressure airflow output, resulting in greater thrust at the outlet. Simultaneously, the convex locking grooves on the outer side of the impeller blade fixing ring, when rotating at high speed, generate centrifugal airflow that effectively prevents the airflow from circling back inside the fan casing, further increasing air pressure and volume. The silencing mechanism significantly reduces operating noise and improves the working environment.

[0014] Furthermore, the plastic welding wire feeding transmission mechanism includes: a geared motor with an umbrella gear on its shaft, which drives the umbrella gear inside the wire feeder gearbox to rotate, thereby causing the teeth of the horizontal main gear and the auxiliary gear of the wire feeder to mesh. When the main gear rotates, it drives the auxiliary gear to rotate synchronously. Each horizontal gear has a semi-circular hole on its left side for meshing with the plastic welding wire. The auxiliary gear has semi-circular spring plates on the outer sides of its two sets of bearings. During the rotation of the two gears, the semi-circular spring plates constantly press inward against the bearings. The inner rings of the two wire feeding holes have slight teeth; during the meshing rotation of the two gears, the plastic welding wire is pulled in by these slight teeth without slipping. This wire feeding mechanism, through the elastic preload of the spring plates, ensures that the two gears are always tightly engaged, combined with the slight teeth on the inner rings of the wire feeding holes, achieving reliable clamping and stable feeding of the plastic welding wire, avoiding slippage, and ensuring synchronization between the wire feeding speed and the welding speed.

[0015] Compared with the prior art, the present invention has the following beneficial effects: First, the welding torch is lighter and its center of gravity is lowered. By placing the adjustable handle at the bottom of the torch body, the center of gravity is significantly lowered, reducing hand fatigue during long periods of operation and making it easy for even inexperienced operators to use.

[0016] Secondly, the welding speed is fast. The high-pressure, high-temperature airflow generated by the ultra-high pressure centrifugal fan can quickly penetrate and soften the surface of the plastic weld. Combined with the longer high-temperature softening stroke of the welding wire, the wire feeding speed and welding movement speed can be greatly improved, significantly increasing work efficiency.

[0017] Third, it saves energy and electricity. The multiple high-density heat-absorbing and heating tubes inside the welding torch tube cause the high-temperature airflow to repeatedly rub and heat during the flow process, so that the heat can be evenly concentrated and fully utilized, reducing heat loss and lowering power consumption.

[0018] Fourth, low noise. The arc-shaped soundproof cover, combined with the structural design of the inner and outer layers of concave and convex sponge, effectively absorbs the high-frequency noise generated by the high-speed rotation of the impeller, improving the working environment for operators and protecting their hearing health.

[0019] Fifth, it is easy to operate. The adjustable handle, stable wire feeding mechanism, and reasonable center of gravity design make the welding torch flexible to operate and precise to point, reducing the difficulty of operation and the technical threshold. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention (showing the overall layout of the gun body mechanism, welding gun handle, wire feeding mechanism, fan mechanism, etc.). Figure 2 This is an exploded structural diagram of the impeller assembly of the ultra-high pressure centrifugal fan in this invention (including impeller blades, fixing ring, soundproof cover, etc.). Figure 3 This is a cross-sectional structural diagram of the ultra-high pressure centrifugal fan and the silencer mechanism in this invention (showing the internal connections of the impeller, silencer cover, and fan housing). Figure 4 This is a cross-sectional view of the welding gun tube and high-temperature heat transfer mechanism in this invention (showing the internal connections of the heating wire, ceramic support, heat transfer tube, and gun head). Figure 5 This is a partial structural diagram of the wire feeding reduction motor and gearbox in this invention (showing the main gear, auxiliary gear, spring plate, etc. of the wire feeding transmission mechanism). Figure 6 This is a top view of the heat absorption and heating device and high-temperature heat transfer tube in this invention (showing the distribution of high-density heat absorption tubes and heat transfer tubes). Figure 7 This is a top view of the impeller of the ultra-high pressure centrifugal fan in this invention (showing the layout of the impeller blades, fixing ring, and bushing).

[0021] Reference numerals: 100—Gun body mechanism; 105—Electric wire hole; 110—Gun barrel; 116—Heating wire power connector; 120—Wire feed gearbox switch; 130—Welding gun handle; 131—Adjustable handle; 150—Main power inlet; 200—Cooling air exhaust pipe; 201—Screw; 202—Wire feeder gearbox; 203—Main gear; 204—Umbrella gear; 205—Umbrella gear; 206—Wire feed gearbox; 211—Heating wire; 213 —Power cord hole; 214—Connector nut; 215—Cooling pipe elbow hole; 217—Lower cooling parallel gun handle connecting pipe; 218—Lower parallel cooling ventilation; 219—Small heat dissipation cooling pipe for plastic welding wire; 300—Ultra-high pressure centrifugal fan; 301—Exhaust outlet; 302—Inlet; 303—Cooling channel; 304—Angled wind vane; 305—Semi-circular arc-shaped wind vane; 307—Card slot; 308—Rear fixing ring; 309—Front fan blade fixing ring 311—Front barrel; 312—Ceramic support; 313—High-temperature heat transfer tube; 314—Locking slot; 315—Circular high-temperature heat transfer tube; 316—Wire feeding gearbox fixing cover; 317—High-pressure airflow cold and warm confluence and distribution channel; 318—High-density heat absorption and heating small tube; 319—Fixed connection bracket; 400—Gear motor; 402—Discharge hole; 403—Gun head fixing screw; 404—Angle adjustable locking teeth; 405—Wind impeller bushing; 406—Electric heating Wire switch; 407—Fixing ingot screw; 408—Adjustable hollow fixing screw; 412—Heat absorption and heating device; 413—Plastic welding wire soft hole; 415—Gun head; 416—High-temperature airflow baffle; 417—Plastic friction flow softening hole; 418—Cross-shaped plastic cutting knife; 419—High-temperature preheating exhaust hole; 501—Gear motor; 505—Semi-circular hole for interlocking plastic welding wire; 506—Secondary gear; 507—Bearing; 508—Semi-circular spring sheet. Detailed Implementation

[0022] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0023] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0024] This invention provides an easy-to-operate plastic welding torch with a low center of gravity and high wind speed.

[0025] In this embodiment, specifically: the welding torch includes a torch body mechanism 100. The torch body mechanism 100 includes a heating wire 211, a barrel 110, a front lower cooling airflow exhaust pipe 200, and a welding torch handle 130. The welding torch handle 130 has a main power inlet 150 on its lower side, a heating wire 211 switch 406 on its inner side, and a wire feeding reduction motor 206 switch 120 on its inner side. The welding torch handle 130 has an adjustable locking tooth 404 on its upper side and a fixing screw 407 on its right side. An adjustable hollow fixing screw 408 has a wire hole 105 in its center, and a hollow outer hole 213 for the fan power supply and the reduction motor 400. The power cables for the fan and reduction motor pass through the center of the adjustable handle 130 fixing screw 408 and are connected to the motor. The welding torch handle 130 has a wire feeding motor 206 switch 120 on its inner side, and the high-pressure fan power supply is connected to a leakage protection plug. Another heating wire power cord passes through the adjustable connector's internal wires, through the gun handle's fixed connection connector 214, then through the cooling pipe elbow hole 215, and into the cold air cooling pipe 200, connecting to the heating wire 211 connector. The heating wire 211 gun barrel 110 is connected to the lower cooling parallel gun handle connecting pipe 217 via a connector nut 214. The welding gun handle 130 connects the parallel lower cooling pipe 217 to the ventilation pipe 200, forming a lower parallel cooling ventilation 218. The rear elbow upward exhaust pipe 218 is connected to the welding gun barrel 110, and the front outer ring of the overall elbow ventilation pipe is equipped with an adjustable handle 131.

[0026] In this embodiment, specifically: the cooling air channel and its high-temperature heating wire mechanism on the front side of the gun barrel include: a high-pressure centrifugal fan 300 is provided at the top of the front side of the gun barrel, and the airflow blown out of its exhaust port 301 enters the front gun barrel 311. A small plastic wire feeding cooling pipe 219 and a front cooling gun barrel 311 are provided in the middle of the cooling channel 303. The small plastic wire feeding cooling pipe 219 is connected to the fixed cover 316 of the plastic wire feeder gearbox, and the wire feeding gearbox 316 is fixed with screws 201. About one-third of the high-pressure cooling airflow flowing in the gun barrel cooling channel 303 enters the space of the high-temperature heating wire center hole 211, immediately generating a high-temperature airflow, which enters the high-pressure airflow hot and cold air mixing distribution channel 317. The high-temperature heating wire is located at the rear, and the hot airflow re-enters the heat absorption and heating device 412.

[0027] In this embodiment, specifically: the cooling mechanism air duct, the high-temperature plastic softening mechanism, and the front side of the heating wire 211 gun barrel 110 include: an enlarged inner ring of the heating wire 211 gun barrel 110 is provided behind the cooling gun barrel 311, and a ceramic bracket 312 for fixing the heating wire 211 is provided. A high-temperature heat transfer tube 313 is provided in the middle, and a plastic welding wire softening hole 315 is provided in the middle. Circular ceramic sleeve 312 locking grooves 314 are provided at both ends of the outer ring to prevent the ceramic sleeve bracket 312 from swinging left and right between the heating wire power connector 116 and the venting safety gasket of the heating wire 211. The front end of the high-temperature heat transfer tube 313 in the middle of the ceramic sleeve is connected to the wire feeding gearbox connecting fixing cover 316, and the rear end is connected to the plastic welding wire heat dissipation tube 219, the welding gun cooling tube 311, and the gear fixing cover 316. The circular high-temperature heat transfer tube 315 has a plastic welding wire softening hole 413 in the middle.

[0028] In this embodiment, specifically: in the high-temperature heat transfer and heating mechanism, the other end of the high-temperature heat transfer tube 315 between the gun barrel 110 and the ceramic support 312 of the heating wire is connected to the front side of the discharge hole in the middle of the gun head 415. A gun head fixing screw 403 is provided on the outer ring of the front side of the welding gun head 415, connected to the discharge hole 402 in the middle of the high-temperature gun head. Softened plastic at the middle end of the gun head is continuously fed into the gun head hole 402 by a hard plastic welding wire through two gears of the wire feeder, causing the softened plastic to be squeezed out of the high-temperature gun head hole 402. A high-temperature preheating exhaust hole 419 for the plastic welding seam is provided on the front side of the gun head 415, and a high-temperature airflow baffle 416 is also provided on the front side. A circular high-temperature airflow mixing and distribution channel 317 is provided at the rear end of the ceramic support sleeve gasket of the heating wire 211, and a heat absorption and heating device 412 is provided on the rear side. The heat absorption and heating device 412 uses multiple high-density heat absorption and heating small tubes 318, which are fixed by fixed connecting brackets 319 at both ends around the perimeter. Multiple high-density heat-absorbing and heat-generating tubes 318 are connected to the whole unit. A high-temperature heat transfer tube 315 is also provided in the middle of the heat-absorbing and heat-generating device 412, with a plastic friction flow softening hole 417 in the center. A cross-shaped plastic cutting blade 418 is provided in the high-temperature softening hole on the front side of the high-temperature gun head. The high-temperature tube 315 is connected to the gun head and the wire feeding gearbox.

[0029] In this embodiment, specifically: the ultra-high pressure centrifugal fan, the silencer mechanism, and the impeller assembly include: the inner side of the rotating impeller housing and the inner side of the rear fixing ring of the impeller's windward blades are integrated with the inner side of the inclined windward blades 304 and the semi-circular scoop blades 305 and the inner side of the rear fixing ring 308. A windmill bushing 405 is provided in the middle of the rear fixing ring, with the fan motor shaft 404 in the middle of the bushing driving the impeller to rotate. The front blades 304 of the impeller are windward blades, and the front side of the scoop blades 305 is fastened to the locking groove 307 on the inner side of the front blade fixing ring. The two fixing rings 308 and 309 are glued together to form an integral impeller. A protruding air intake 302 is provided in the middle of the front side of the rotating impeller, with a gap between it and the protruding baffle ring of the outer centrifugal fan housing 300. The entire impeller generates sharp ultrasonic waves during high-speed rotation. A circular arc-shaped silencer cover 406 is provided on the front side of the impeller air intake 302, with a sound-absorbing textured sponge 408 attached to its inner side. High-decibel sound generated inside the fan air intake is absorbed by the soft sponge 408. A sound-absorbing ring 407 is provided inside the silencer cover, with textured sponge attached to both the inner and outer rings. The sound-absorbing ring 407 is fixed to the outer side of the centrifugal fan casing 300. Multiple fixed connecting support strips are provided inside the circular arc-shaped silencer cover, and the bottom space is surrounded by the impeller air intake channel. High-decibel sound generated at the impeller air intake is absorbed by the soft sponge inside the silencer cover after circulating through the soft channel, preventing it from diffusing.

[0030] In this embodiment, specifically, the plastic welding wire feeding transmission mechanism includes: a reduction motor 501, with an umbrella gear 205 mounted on its shaft, which drives the umbrella gear 204 inside the wire feeder gearbox 202 to rotate, thereby causing the teeth of the horizontal main gear 203 to mesh with the teeth of the auxiliary gear 506. When the main gear 203 rotates, it drives the auxiliary gear 506 to rotate synchronously. Each horizontal gear has a semi-circular hole 505 on the left side center for meshing with the plastic welding wire. The auxiliary gear 506 has semi-circular spring plates 508 on the outer sides of its two sets of bearings 507. During the rotation of the two gears, the semi-circular spring plates 508 constantly press inward against the bearings 507. The inner rings of the two wire feeding holes have slight teeth; during the meshing rotation of the two gears, the plastic welding rod is pulled in by these slight teeth without slipping.

[0031] In this embodiment, specifically: the inner side of the gun barrel 110 is covered with high-temperature resistant heat insulation paper, and the outer ring of the high-temperature zone of the entire welding gun is provided with a long, round protective cover made of a perforated heat dissipation mesh plate. The inner ring is separated from the heat by multiple layers of high-temperature resistant heat insulation paper and a perforated heat dissipation protective cover. This not only prevents the loss of high-temperature heat from the heating wire, but also avoids burns caused by operators accidentally touching the high-temperature gun barrel, thus improving the safety of use.

[0032] In operation, according to this embodiment of the invention: the operator first adjusts the angle of the welding torch handle 130 according to personal preference, and the locking teeth 404 and the fixing screw 407 are locked in place by adjusting the angle. After connecting the power supply, the heating wire switch 406 and the wire feeding reduction motor switch 120 are turned on. The ultra-high pressure centrifugal fan 300 starts, and the high-speed, high-pressure airflow generated enters the front torch tube 311 and the cooling channel 303 through the exhaust port 301. About one-third of the high-pressure cooling airflow enters the space of the high-temperature heating wire center hole 211, and is rapidly heated to form a high-temperature airflow as it passes through the heating wire. It then enters the heat absorption and heating device 412 through the high-pressure airflow hot and cold confluence distribution channel 317. The remaining two-thirds of the high-pressure cooling airflow enters the welding torch handle 130 area via the lower parallel cooling ventilation vent 218 to cool and protect the geared motor. It then returns through two bends to the airflow distribution channel 317 at the end of the heating wire ceramic tube, mixing with the high-temperature airflow to form a high-temperature, high-pressure airflow. This airflow is finally blown out from the high-temperature preheating exhaust port 419 of the torch head 415, preheating and softening the plastic weld seam. Simultaneously, the plastic welding wire is clamped by the main gear 203 and auxiliary gear 506 within the wire feeding gearbox 202. The elastic preload of the semi-circular spring plate 508 ensures no slippage. The welding wire sequentially passes through the small heat dissipation cooling pipe 219, the high-temperature heat transfer pipe 313, and the circular high-temperature heat transfer pipe 315 into the high-temperature softening zone. Under high temperature, it softens rapidly and is then expelled from the torch head outlet 402 under the wire feeding thrust, completing the welding operation.

Claims

1. A low center of gravity, high air speed, easy to operate plastic welding gun characterized by, include: The gun body mechanism (100) includes a heating wire (211), a gun barrel (110), a front lower end cooling airflow exhaust pipe (200), and a welding gun handle (130). The welding torch handle (130) is provided with a main power inlet (150) on the lower side, a heating wire (211) switch (406) on the inner side, and a wire feeding reduction motor (206) switch (120) on the inner side of the handle. The welding torch handle (130) has an adjustable locking tooth (404) on the upper side and a fixing screw (407) on the right side. The adjustable hollow fixing screw (408) has a wire hole (105) in the middle and a power cable hole (213) in the middle of the outer side of the fan power supply and the geared motor (400). The power cords of the fan and geared motor pass through the middle of the adjusting handle (130) and the fixing screw (408) and are connected to the motor. The welding torch handle (130) is equipped with a wire feeding motor (206) switch (120) inside, and the high-pressure fan power supply is connected to the leakage protection plug; Another heating wire power cord passes through the adjustable connector, through the internal wire of the connector, through the fixed connection connector (214) of the gun handle, through the cooling pipe elbow hole (215), and into the cold air cooling pipe (200), and connects to the heating wire (211) connector; The heating wire (211) and the gun barrel (110) are connected to the lower cooling parallel gun handle connecting pipe (217) by a connector nut (214); The welding torch handle (130) connects the parallel lower cooling pipe (217) and the ventilation pipe (200) to form a lower parallel cooling ventilation pipe (218). The rear elbow upward exhaust pipe (218) is connected to the welding gun pipe (110), and the outer ring of the front side of the overall elbow vent pipe is provided with an adjustable handle (131).

2. The low center of gravity, high air velocity, easy to operate plastic welding gun of claim 1, wherein, The front cooling air channel of the gun barrel and its high-temperature heating wire mechanism include: The top front side of the gun barrel is equipped with an ultra-high pressure centrifugal fan (300), and the exhaust port (301) blows out airflow into the front gun barrel (311). The cooling channel (303) is provided with a plastic welding wire conveying small heat dissipation cooling pipe (219) and a front cooling gun pipe (311) in the middle. The plastic wire feeding cooling pipe (219) is connected to the fixed cover (316) of the plastic wire feeder gearbox, and the wire feeding gearbox (316) is fixed with screws (201); Within the barrel cooling channel (303), approximately 1 / 3 of the high-pressure cooling airflow enters the space of the high-temperature heating wire center hole (211) and immediately generates a high-temperature airflow, which then enters the high-pressure airflow cold and warm mixing distribution channel (317). A high-temperature heating wire is provided at the rear, and the hot airflow re-enters the heat absorption and heating device (412).

3. The low center of gravity, high air velocity, easy to operate plastic welding gun of claim 2, wherein, The cooling mechanism air duct, high-temperature plastic softening mechanism and the front side of the heating wire (211) gun barrel (110) include: The cooling gun tube (311) is provided with an enlarged heating wire (211) inner ring on the rear side of the gun tube (110), and a ceramic bracket (312) for fixing the heating wire (211) is provided. A high-temperature heat transfer tube (313) is provided in the middle, and a plastic welding wire softening hole (315) is provided in the middle. The outer ring has circular ceramic sleeve (312) slots (314) at both ends to prevent the ceramic sleeve bracket (312) from swinging left and right between the heating wire power connector (116) and the heating wire (211) ventilation safety pad. The front end of the ceramic sleeve intermediate high-temperature heat transfer tube (313) is connected to the wire feeding gearbox connection fixing cover (316), and the rear end is connected to the plastic welding wire heat dissipation tube (219), the welding gun cooling tube (311) and the gear fixing cover (316). The circular high-temperature heat transfer tube (315) has a plastic welding wire soft hole (413) in the middle.

4. The low center of gravity, high air velocity, easy to operate plastic welding gun of claim 3, wherein, In the high-temperature heat transfer and heating mechanism, the other end of the high-temperature heat transfer tube (315) between the gun barrel (110) and the ceramic support (312) of the heating wire is connected to the front side of the discharge hole in the middle of the gun head (415). The welding torch head (415) is provided with a torch head fixing screw (403) on the outer ring of the front side, which is connected to the discharge hole (402) in the middle of the high temperature torch head; The softened plastic at the middle end of the gun head is continuously fed into the gun head hole (402) by the hard plastic welding wire through the two gears of the wire feeder, so that the softened plastic is squeezed out from the high temperature gun head hole (402); The gun head (415) is provided with a plastic welding seam high temperature preheating exhaust hole (419) on the front side, and a high temperature airflow wind shield (416) on the front side. The electric heating wire (211) ceramic support sleeve gasket has a circular high-temperature airflow mixing and distribution channel (317) at the rear end, and a heat absorption and heating device (412) on the rear side. The heat absorption and heating device (412) uses multiple high-density heat absorption and heating tubes (318), and is fixed by fixed connecting brackets (319) at both ends around the perimeter; Multiple high-density heat-absorbing and heating tubes (318) are connected to the whole, and a high-temperature heat transfer tube (315) is also provided in the middle of the heat-absorbing and heating device (412), with a plastic friction flow softening hole (417) in the center. The high-temperature gun head is equipped with a cross-shaped plastic crushing blade (418) in the high-temperature softening hole on the front side. The high-temperature tube (315) is connected to the gun head and the wire feeding gearbox.

5. The low center of gravity, high air velocity, easy to operate plastic welding gun of claim 1, wherein, The ultra-high total pressure centrifugal fan, silencer, and impeller assembly include: The inner side of the rotating wind turbine casing and the inner side of the rear fixing ring of the wind turbine windward blade are connected to the inner side of the inclined windward blade (304) and the semi-circular arc wind-catching blade (305) and the inner side of the rear fixing ring piece (308); The rear fixed ring is provided with a wind turbine shaft sleeve (405) in the middle, and the wind turbine motor shaft (404) in the middle of the shaft sleeve drives the wind turbine to rotate; The front blade (304) of the wind turbine is the wind-facing blade. The front side of the wind-catching blade (305) is fastened to the inner slot (307) of the front wind blade fixing ring. The two fixing rings (308) and (309) are glued together to form an integral wind turbine. The rotating impeller has a protruding air intake (302) in the middle of its front side, and there is a gap between it and the protruding baffle ring of the outer centrifugal fan housing (300); The entire wind turbine generates sharp ultrasonic waves during high-speed rotation; The front side of the wind turbine air inlet (302) is provided with an arc-shaped sound-absorbing cover (406), and the inner side is covered with a sound-absorbing embossed sponge (408). The high-decibel sound generated inside the fan's air intake is absorbed by the impact of the soft sponge (408); The inside of the muffler cover is equipped with a sound-absorbing ring (407), and both the inner and outer rings are covered with textured sponge. The inner side of the sound-absorbing ring (407) is fixed to the outer side of the centrifugal fan casing (300); The inner side of the arc-shaped silencer cover is equipped with multiple fixed connecting support bars, and the bottom space is surrounded by the impeller air intake channel; The high-decibel sound generated by the fan wheel's air intake is absorbed by the soft sponge inside the soundproof cover after circulating through the soft channel, preventing it from spreading.

6. The low center of gravity, high air velocity, easy to operate plastic welding gun of claim 1, wherein, The plastic welding wire feeding transmission mechanism includes: The geared motor (501) has an umbrella gear (205) on its shaft, which drives the umbrella gear (204) inside the wire feeder gearbox (202) to rotate, thereby driving the teeth of the wire feeder horizontal main gear (203) to mesh with the teeth of the auxiliary gear (506); When the main gear (203) rotates, it drives the secondary gear (506) to rotate synchronously; Each horizontal gear has a semi-circular hole (505) on the left side center of its horizontal side where a plastic welding wire bites into it. The auxiliary gear (506) has two sets of bearings (507) with semi-circular spring plates (508) on the outside. During the rotation of the two gears, the arc-shaped spring plate (508) always presses against the bearing (507) inward. The inner rings of the two wire feeding holes are rolled with slight teeth. During the meshing and rotation of the two gears, the plastic welding rod is pulled in by the slight teeth and will not slip.

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