Spraying dispensing gun with heating structure

Abstract

The utility model discloses a kind of spraying dispensing gun with heating structure, including body, filtering device, and needle valve, filter cavity is opened in body, filtering device is installed in filter cavity, the rear side of body is equipped with the first glue hole for feeding, first glue hole is communicated filter cavity for filtering colloid, needle valve is installed in the front side of body, first flow passage is opened in filter cavity, one end of first flow passage is communicated filter cavity, the other end of first flow passage is communicated the input end of needle valve for transmission filtered colloid, colloid is exported for dispensing by needle valve output end;By being arranged in the transmission groove of body bottom and being arranged in the air passage of needle valve output end, when gas passes through transmission groove, first heating pipe heats the gas in transmission groove to form hot air again to be delivered to air passage, can be used for heating colloid located in needle valve output end, so that the temperature of colloid in output end and colloid in first flow passage is uniform, make colloid keep lower viscosity, can improve the quality of glue spraying.

Description

Technical Field

[0001] This utility model relates to the field of dispensing equipment, and in particular to a spray dispensing gun with a heating structure. Background Technology

[0002] A glue gun is a high-precision fluid control tool mainly used to accurately drip or coat liquid materials such as glue and paint onto products. It can achieve precise application or drawing of glue during product manufacturing, ensuring that each product can obtain a uniform and consistent liquid coating effect.

[0003] Chinese utility model patent (authorization announcement number: CN201913049U) discloses a dispensing valve, including a material cylinder for loading adhesive and a spray valve part connected to the material cylinder through a pipeline. The spray valve part is fixed with a solenoid valve box for installing a solenoid valve. The solenoid valve box is fixed with an electrical junction box for placing cables and air pipes. A preheating component is provided on the connecting pipeline between the material cylinder and the spray valve part.

[0004] However, after the colloid in the barrel is heated by the metal heat-conducting plate, it flows to the nozzle for spraying. Since the area of ​​the metal heat-conducting plate that heats the colloid is only located in the channel that transports the colloid, the temperature of the colloid at the nozzle will be lower than the temperature of the colloid in the metal heat-conducting plate. Especially when the dispensing valve is in continuous operation, there will still be cases where the viscosity of the colloid is too high, resulting in uneven spraying. Utility Model Content

[0005] To overcome the shortcomings mentioned above, this utility model aims to provide a technical solution that can solve the above problems.

[0006] A spray dispensing gun with a heating structure includes a body and a needle valve. The rear side of the body has a first glue inlet for feeding, and the needle valve is installed on the front side of the body. The body has a first flow channel. One end of the first glue inlet is connected to the first flow channel for conveying glue into the first flow channel, and the other end of the first flow channel is connected to the input end of the needle valve for transmitting glue into the needle valve. The glue is output through the output end of the needle valve for dispensing.

[0007] The main body is provided with a heating structure, which includes a first blind hole and a first heating tube opened in the main body. The first blind hole is adjacent to the first flow channel and located below the first flow channel. The first heating tube is detachably installed in the first blind hole for heating the colloid in the first flow channel.

[0008] The bottom surface of the main body is provided with a transmission groove, which is adjacent to the first blind hole. One end of the transmission groove is provided with an air inlet, and the other end of the transmission groove is provided with an air outlet. The output end of the needle valve is provided with an air passage, which is connected to the air outlet. The bottom surface of the main body is provided with a base plate, which abuts against the transmission groove to form a channel for transmitting gas. The gas enters the transmission groove from the air inlet and is heated by the first heating tube to form hot air. The hot air is transmitted from the air outlet to the air passage to heat the output end of the needle valve.

[0009] As a further embodiment of this utility model: a plurality of heating blocks are provided in the transmission groove, and the plurality of heating blocks are arranged alternately on the left and right sides of the transmission groove. The bottom plate abuts against the transmission groove to form a tortuous gas pipe for transmitting gas. The gas flows from the air inlet through the gas pipe, is heated, and then flows from the air outlet to the gas channel.

[0010] As a further embodiment of this utility model: the output end of the needle valve includes an output channel for discharging colloid, the first channel is connected to the output channel for conveying colloid, the needle valve is provided with at least two air channels, the two air channels are adjacent to the output channel, and the gas in the gas channel flows through the air channel to heat the colloid in the output channel.

[0011] As a further embodiment of this utility model: a filter cavity is provided at the top of the main body, and the filter cavity extends downward to the main body until the first glue inlet hole and the first flow channel are connected to the filter cavity. A filter device is provided in the filter cavity. The colloid flows into the filter cavity from the first glue inlet hole, is filtered by the filter device, and then flows from the bottom of the filter cavity to the first flow channel.

[0012] The filtration device includes a sleeve, a filter screen, and two sealing rings. The sleeve has a hollow interior, and the two sealing rings are respectively fitted onto both ends of the sleeve. Several first guide holes are opened on the outer surface of the sleeve. The filter screen is wrapped around the outer surface of the sleeve. A second guide hole is provided at the bottom of the sleeve, and the second guide hole is connected to the first flow channel. When the sleeve is inserted into the filter cavity, the two sealing rings abut against the inner wall of the filter cavity to form a filtration space. The first glue inlet hole is connected to the filtration space for feeding. The colloid flows through the filter screen and then through the first guide holes to the interior of the sleeve. The colloid inside the sleeve flows through the second guide hole to the first flow channel, thus completing the filtration and conveying.

[0013] As a further embodiment of this utility model: the main body has at least two first blind holes, and the main body is provided with two first heating tubes, which are respectively inserted into the two first blind holes.

[0014] As a further embodiment of this utility model, the heating structure also includes a second blind hole opened in the body. The second blind hole can be located in front of or behind the filter cavity. The body is provided with a second heating tube, which is inserted into the second blind hole.

[0015] As a further embodiment of this utility model: the main body is also provided with a valve air inlet device, and at least two sets of air inlets are opened on the top of the main body. The air inlets are respectively connected to the valve air inlet device. At least two sets of air outlets are opened on the front side of the main body. The two air inlets are connected to the two air outlets to form a pipeline for conveying gas. The two air outlets are respectively connected to two needle valves.

[0016] As a further embodiment of this utility model: the valve air intake device includes a solenoid valve and at least two air intake pipes. The output end of the solenoid valve is connected to one end of the two air intake pipes, and the other end of the two air intake pipes is connected to two air intake holes respectively. The top of the solenoid valve is provided with an input end. After the air enters the input end of the solenoid valve, it flows from the output end to the air intake pipe, and then flows from the air intake pipe into the needle valve.

[0017] As a further embodiment of this utility model: the main body is provided with a second glue inlet hole, which is located on the side of the main body adjacent to the first glue inlet hole. The second glue inlet hole is connected to the filter chamber for conveying the glue to the filter chamber for filtration.

[0018] As a further embodiment of this utility model: the filter cavity is provided with at least two first flow channels, and the front side of the main body is provided with at least two needle valves. One end of the two first flow channels is connected to the filter cavity, and the other end of the two first flow channels is respectively connected to the input end of the two needle valves.

[0019] Compared with the prior art, the beneficial effects of this utility model are: through the transmission groove set at the bottom of the main body and the air channel set at the output end of the needle valve, when the gas passes through the transmission groove, the first heating tube heats the gas in the transmission groove to form hot air, and then the hot air is delivered to the air channel, which can be used to heat the colloid located at the output end of the needle valve, so that the temperature of the colloid in the output end and the colloid in the first flow channel is uniform, which is conducive to maintaining the low viscosity of the colloid and improving the quality of spraying glue.

[0020] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is an exploded view of the spraying glue gun in this utility model.

[0023] Figure 2This is an exploded view of the main body, the first heating tube, and the second heating tube of this utility model.

[0024] Figure 3 This is a top view of the main body of this utility model.

[0025] Figure 4 yes Figure 3 Sectional view at point AA.

[0026] Figure 5 This is a schematic diagram of the filter device in this utility model.

[0027] Figure 6 This is an exploded view of the filtration device in this utility model.

[0028] Figure 7 This is a partial cross-sectional view of the filter device and the main body of this utility model.

[0029] Figure 8 This is an exploded view of the body and base plate in this utility model.

[0030] Figure 9 This is a side view of the main body of this utility model.

[0031] Figure 10 yes Figure 9 Sectional view at point BB.

[0032] Figure 11 This is a side view of the needle valve in this utility model.

[0033] Figure 12 yes Figure 11 Sectional view at point CC.

[0034] Figure 13 This is another side view of the needle valve in this utility model.

[0035] Figure 14 yes Figure 13 Sectional view at point DD.

[0036] Figure 15 This is a partial cross-sectional view of the needle valve output end.

[0037] In the diagram: 1. Body; 11. Filter chamber; 12. First glue inlet; 13. First flow channel; 14. Air inlet; 15. Air outlet; 16. Power connection port; 2. Filter device; 21. Sleeve; 211. First guide hole; 212. Second guide hole; 22. Filter screen; 23. Sealing ring; 3. Needle valve; 31. Needle valve output end; 311. Air passage; 312. Output flow channel; 313. Air delivery passage; 41. First heating tube; 42. Second heating tube; 43. First blind hole; 44. Second blind hole; 5. Valve air inlet device; 51. Solenoid valve; 52. Air inlet pipe; 6. Power supply structure; 61. Power cord; 62. Power plug; 17. Second glue inlet; 171. Sealing plug; 18. Air inlet; 19. Air outlet; 71. Transfer groove; 72. Base plate; 711. Heating block. Detailed Implementation

[0038] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0039] Please see Figures 1-4 In this embodiment of the present invention, a spray dispensing gun with a heating structure includes a body 1 and a needle valve 3. A first glue inlet hole 12 for feeding is provided on the rear side of the body 1. The needle valve 3 is installed on the front side of the body 1. A first flow channel 13 is provided inside the body 1. One end of the first glue inlet hole 12 is connected to the first flow channel 13 for conveying glue to the first flow channel 13. The other end of the first flow channel 13 is connected to the input end of the needle valve for transmitting glue to the inside of the needle valve. The glue is output through the output end 31 of the needle valve for dispensing.

[0040] The main body 1 is provided with a heating structure, which includes a first blind hole 43 and a first heating tube 41 opened in the main body 1. The first blind hole 43 is adjacent to the first flow channel 13 and located below the first flow channel 13. The first heating tube 41 is detachably installed in the first blind hole 43 for heating the colloid in the first flow channel 13.

[0041] Specifically, the needle valve 3 can be a product with an existing conventional design. For example, the needle valve 3 can be a mini needle valve, such as the MV-0180LF miniature needle dispensing valve from Fisnar. Alternatively, the needle valve 3 can be a single-liquid dispensing valve for dispensing machines, model JQ-19TG. The needle valve 3 has an input end and an output end. The specific structure of the needle valve 3 can be found in ZL201220022088.3 or ZL01229265.6, and will not be elaborated further in this invention.

[0042] Further as Figures 5-7As shown, in one embodiment of the present invention, a filter cavity 11 is provided at the top of the main body 1. The filter cavity 11 extends downwards from the main body 1 until the first glue inlet hole 12 and the first flow channel 13 are both connected to the filter cavity 11. A filter device 2 is provided inside the filter cavity 11. The colloid flows into the filter cavity 11 from the first glue inlet hole 12, is filtered by the filter device 2, and then flows from the bottom of the filter cavity 11 to the first flow channel 13.

[0043] The filter device 2 can adopt the following technical solution: The filter device 2 includes a sleeve 21, a filter screen 22, and two sealing rings 23. The sleeve 21 has a hollow interior, and the two sealing rings 23 are respectively fitted onto both ends of the sleeve 21. Several first guide holes 211 are opened on the outer surface of the sleeve 21. The filter screen 22 is wrapped around the outer surface of the sleeve 21. A second guide hole 212 is provided at the bottom of the sleeve 21, and the second guide hole 212 is connected to the first flow channel 13. When the sleeve 21 is inserted into the filter cavity 11, the two sealing rings 23 abut against the inner wall of the filter cavity 11 to form a filter space. The first glue inlet hole 12 is connected to the filter space for feeding. The glue flows into the filter space from the glue inlet. After passing through the filter screen 22, the glue flows through the first guide hole 211 to the inside of the sleeve 21. The glue inside the sleeve 21 flows through the second guide hole 212 to the first flow channel 13, thereby completing the filtration and conveying. Specifically, as shown in the figure... Figure 7 As shown, when the two sealing rings 23 are fitted onto the sleeve 21, the edges of the sealing rings 23 abut against the cavity wall of the filter chamber 11. The sealing rings 23 at both ends, the filter screen 22 and the cavity wall of the filter chamber 11 form an annular sealed filtration space. The colloid can enter the sleeve 21 from all sides of the filter screen 22, which has high colloid injection efficiency and can prevent leakage when it flows from the first colloid injection hole 12 into the filtration space.

[0044] In another embodiment of this utility model, at least two first flow channels 13 may be provided at the bottom of the filter cavity 11. The two first flow channels 13 are connected to the bottom of the filter cavity 11. At least two needle valves 3 are provided on the front side of the main body 1. One end of the two first flow channels 13 is connected to the filter cavity 11, and the other end of the two first flow channels 13 is connected to the input end of the two needle valves respectively. By installing two needle valves 3, double the glue spraying action can be achieved without changing the volume and weight.

[0045] Further as Figures 2-4 As shown, in one embodiment of this utility model, the layout of the first blind hole 43 and the first heating tube 41 can be as follows: the body 1 has at least two first blind holes 43, and the body 1 is correspondingly provided with two first heating tubes 41, which are respectively inserted into the two first blind holes 43. The first blind holes 43 can be evenly spaced at a certain distance in the first flow channel 13, for example, the distance between the first blind hole 43 and the first flow channel 13 is 3mm to 5mm, so that the first heating tube 41 can heat the colloid in the first flow channel 13, preventing uneven heating of the colloid in the first flow channel 13, which would affect the dispensing effect.

[0046] Further as Figures 2-4 As shown, in another embodiment of the present invention, the heating structure further includes a second blind hole 44 opened in the body 1. The second blind hole 44 can be arranged adjacent to the front and rear of the filter cavity 11. The body 1 correspondingly inserts a second heating tube 42 into the second blind hole 44, thereby heating the filter cavity 11 through the second heating tube 42. Specifically, the second heating tube 42 and the filter cavity 11 are arranged perpendicularly and alternately, that is, the second blind hole 44 extends from the right side of the body 1 towards the left side of the body 1. The first glue inlet hole 12, the filter cavity 11, and the first flow channel 13 are used for glue transfer in the front-back direction of the body 1. This layout facilitates assembly and processing by workers in actual production. On the other hand, the process of transferring the glue used for dispensing from the first glue inlet hole 12 to the filter cavity 11, and then through the first flow channel 13 to the needle valve 3 can be understood as the direction of transfer from the rear side of the body 1 to the needle valve 3 at the front side of the body 1. During the glue transfer process, the first heating tube 41 and the second heating tube 42 can heat the filter cavity 11 and the first flow channel 13 respectively, ensuring that the glue used for dispensing is heated evenly. The first heating tube 41 and the second heating tube 42 can be single-ended heating tubes, such as the EH5220 heating tube from Guangdong Santian Electric Heating Products Co., Ltd. The first blind hole 43 and the first flow channel 13 are arranged in an alternating manner, and the first blind hole 43 and the first flow channel 13 are arranged in a mutually perpendicular manner.

[0047] Further as Figure 4 and Figure 8 As shown, in one embodiment of this utility model, a duct structure for transmitting air to the needle valve output end 31 is provided below the first blind hole 43. The duct structure can adopt the following technical solution: a transmission groove 71 is provided on the bottom surface of the body 1, the transmission groove 71 is adjacent to the first blind hole 43, an air inlet 18 is provided at one end of the transmission groove 71, and an air outlet 19 is provided at the other end of the transmission groove 71. The needle valve output end 31 is provided with an air passage 311, which is connected to the air outlet 19. A base plate 72 is provided on the bottom surface of the body 1, which covers the groove of the transmission groove 71 to form a sealed channel for transmitting gas. The gas enters the transmission groove 71 from the air inlet 18 and is heated by the first heating tube 41 to form hot air. The hot air is transmitted from the air outlet 19 to the air passage 311 and can be used to heat the needle valve output end 31. Specifically, the depth of the transmission groove 71 is opened to be close to the first blind hole 43. For example, the distance between the transmission groove 71 and the first blind hole 43 is 3mm to 5mm. When the distance between the transmission groove 71 and the first blind hole 43 is 3mm, the heat conduction effect of the first heating tube 41 on the transmission groove 71 is optimal.

[0048] Further as Figures 8-10As shown in this embodiment of the invention, the transmission groove 71 is provided with a plurality of heating blocks 711 and a base plate 72. The heating blocks 711 are disposed in the transmission groove 71, with adjacent heating blocks 711 spaced apart by a certain distance and respectively connected to the left and right sides of the transmission groove 71. The length of the heating block 711 is not greater than the width of the transmission groove 71 in the left and right directions, so that a tortuous groove can be formed in the transmission groove 71. The base plate 72 abuts against the transmission groove 71 to form a gas pipe for transmitting gas. The tortuous gas pipe can increase the contact area with the gas and improve the heat conduction effect. The gas flows from the air inlet 18 through the gas pipe, is heated, and then flows from the air outlet 19 to the gas passage 311. Specifically, the heating block 711 is integrally connected to the body 1, for example by casting or machining. The connection between the base plate 72 and the body 1 includes, but is not limited to, threaded connection and snap-fit ​​connection.

[0049] Further as Figures 11-12 As shown in the embodiment of this utility model, the needle valve output end 31 includes an output channel 312 for outputting colloid, a first channel 13 is connected to the output channel 312 for transmitting colloid, and the needle valve 3 is provided with at least two air channels 311, the two air channels 311 are adjacent to the output channel 312, and the gas in the gas pipe flows through the air channel 311 to heat the colloid in the output channel 312.

[0050] Further as Figures 13-15 As shown in this embodiment of the present invention, at least four air passages 311 are provided at the needle valve output end 31. The four air passages 311 are respectively arranged around the output flow channel 312. Two air delivery passages 313 are provided at the needle valve output end 31. One end of the two air delivery passages 313 intersects and connects to the air outlet 19. The other end of the two air delivery passages 313 extends toward the air passage 311 and connects to the air passage 311. Hot air flows from the air outlet 19 through the air delivery passages 313 and then flows through the air delivery passages 313 to each air passage 311. The hot air can be discharged at the lower end of the air passage 311. The above scheme can heat the output flow channel 312, thereby ensuring the temperature of the colloid.

[0051] Further as Figures 1-4 As shown in the embodiment of this utility model, the main body 1 is also provided with a valve air inlet device 5 for controlling the dispensing of glue from the needle valve 3. At least two sets of air inlets 14 are opened on the top of the main body 1, and the air inlets 14 are respectively connected to the valve air inlet device 5. At least two sets of air outlets 19 are opened on the front side of the main body 1. The two air inlets 14 are connected to the two air outlets 19 to form a pipeline for conveying gas. The two air outlets 19 are respectively connected to the two needle valves 3.

[0052] Further as Figures 1-4As shown in the embodiment of this utility model, the valve air inlet device 5 can adopt the following scheme: at least two sets of air inlets 14 are opened on the top of the body 1, and at least two sets of air outlets 15 are opened on the side of the body 1 where the needle valve 3 is installed. The two air inlets 14 are connected to the two air outlets 15 to form a pipeline for conveying gas. The two air outlets 15 are respectively connected to the two needle valves 3. An air inlet pipe 52 is provided between the solenoid valve 51 and the air inlet 14. The output end of the solenoid valve 51 is connected to one end of the two air inlet pipes 52, and the other end of the two air inlet pipes 52 is respectively connected to the two air inlets 14. The top of the solenoid valve 51 is provided with an input end. After the air enters the input end of the solenoid valve 51, it flows from the output end of the solenoid valve 51 to the air inlet pipe 52, and then flows from the air inlet pipe 52 into the needle valve 3. After the air is pressurized by the solenoid valve 51, it is transmitted to the needle valve 3. The flow rate of the transmitted gas is controlled by the solenoid valve 51 to control the dispensing of glue from the needle valve 3. Specifically, the connection between the solenoid valve 51 and the intake pipe 52 includes, but is not limited to, threaded connection.

[0053] Further as Figures 1-2 As shown in the embodiment of this utility model, the main body 1 is also provided with a power supply structure 6. The power supply structure 6 includes a power inlet 16, a power cord 61 and a power plug 62, which are opened on the top of the main body 1. One end of the power cord 61 is inserted into the power inlet 16, and the other end of the power cord 61 is connected to the power plug 62.

[0054] Further as Figure 1 and Figures 8-9 As shown, in an embodiment of this utility model, the main body 1 has a second glue inlet hole 17, which is located on the side of the main body 1 adjacent to the first glue inlet hole 12. The second glue inlet hole 17 is connected to the filter chamber 11 for conveying the glue to the filter chamber 11 for filtration. Specifically, a sealing plug 171 is provided at the second glue inlet hole 17. The sealing plug 171 is inserted into the second glue inlet hole 17. When the spray gun is installed on the robot arm, if the first glue inlet hole 12 interferes and prevents material from being fed, the sealing plug 171 can be removed and installed in the first glue inlet hole 12, and the material can be fed through the second glue inlet hole 17.

[0055] The working principle of this utility model is as follows: through the transmission groove 71 set at the bottom of the main body 1 and the air channel 311 set at the needle valve output end 31, when the gas passes through the transmission groove 71, the first heating tube 41 heats the gas in the transmission groove 71 to form hot air, and then the hot air is delivered to the air channel 311, which can be used to heat the colloid located at the needle valve output end 31, so that the temperature of the colloid in the output end and the colloid in the first flow channel 13 is uniform, which is conducive to maintaining the low viscosity of the colloid and improving the quality of spraying glue.

[0056] 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 considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

Claims

1. A spray dispensing gun with a heating structure, characterized in that, Includes a body (1) and a needle valve (3). The rear side of the body (1) is provided with a first glue inlet hole (12) for feeding. The needle valve (3) is installed on the front side of the body (1). The body (1) is provided with a first flow channel (13). The first glue inlet hole (12) is connected to one end of the first flow channel (13) for conveying the glue to the first flow channel (13). The other end of the first flow channel (13) is connected to the input end of the needle valve for transmitting the glue to the inside of the needle valve. The glue is output through the output end (31) of the needle valve for dispensing. The body (1) is provided with a heating structure, which includes a first blind hole (43) and a first heating tube (41) opened in the body (1). The first blind hole (43) is adjacent to the first flow channel (13) and located below the first flow channel (13). The first heating tube (41) is detachably installed in the first blind hole (43) for heating the colloid in the first flow channel (13). The bottom surface of the main body (1) is provided with a transmission groove (71), which is adjacent to the first blind hole (43). One end of the transmission groove (71) is provided with an air inlet (18), and the other end of the transmission groove (71) is provided with an air outlet (19). The needle valve output end (31) is provided with an air passage (311), which is connected to the air outlet (19). The bottom surface of the main body (1) is provided with a bottom plate (72), which abuts against the transmission groove (71) to form a channel for transmitting gas. The gas enters the transmission groove (71) from the air inlet (18) and is heated by the first heating tube (41) to form hot air. The hot air is transmitted from the air outlet (19) to the air passage (311) to heat the needle valve output end (31).

2. The spray gun with a heating structure according to claim 1, characterized in that, The transmission trough (71) is provided with several heating blocks (711), which are staggered on the left and right sides of the transmission trough (71). The bottom plate (72) abuts against the transmission trough (71) to form a tortuous gas pipe for transmitting gas. The gas flows from the air inlet (18) through the gas pipe, is heated, and then flows from the air outlet (19) to the gas passage (311).

3. The spray gun with a heating structure according to claim 1, characterized in that, The needle valve output end (31) includes an output channel (312) for discharging colloid. The first channel (13) is connected to the output channel (312) for conveying colloid. The needle valve (3) is provided with at least two air channels (311). The two air channels (311) are adjacent to the output channel (312). The gas in the gas channel flows through the air channel (311) to heat the colloid in the output channel (312).

4. The spray gun with a heating structure according to claim 1, characterized in that, A filter cavity (11) is provided at the top of the main body (1). The filter cavity (11) extends downward to the main body (1) until the first glue inlet hole (12) and the first flow channel (13) are connected to the filter cavity (11). A filter device (2) is provided in the filter cavity (11). The colloid flows into the filter cavity (11) from the first glue inlet hole (12), is filtered by the filter device (2), and then flows from the bottom of the filter cavity (11) to the first flow channel (13). The filter device (2) includes a sleeve (21), a filter screen (22), and two sealing rings (23). The sleeve (21) has a hollow interior. The two sealing rings (23) are respectively fitted onto both ends of the sleeve (21). Several first guide holes (211) are opened on the outer surface of the sleeve (21). The filter screen (22) is wrapped around the outer surface of the sleeve (21). A second guide hole (212) is provided at the bottom of the sleeve (21). The second guide hole (212) is connected to the first... A flow channel (13) is formed when the sleeve (21) is inserted into the filter cavity (11). The two sealing rings (23) abut against the inner wall of the filter cavity (11) to form a filter space. The first glue inlet hole (12) is connected to the filter space for feeding. The colloid flows through the filter screen (22) and then through the first guide hole (211) to the inside of the sleeve (21). The colloid inside the sleeve (21) flows from the second guide hole (212) to the first flow channel (13) to complete the filtration and conveying.

5. The spray gun with a heating structure according to claim 1, characterized in that, The main body (1) has at least two first blind holes (43), and the main body (1) is provided with two first heating tubes (41), which are respectively inserted into the two first blind holes (43).

6. The spray gun with a heating structure according to claim 1, characterized in that, The heating structure also includes a second blind hole (44) opened in the body (1). The second blind hole (44) can be located in front of and behind the filter cavity (11). The body (1) is provided with a second heating tube (42), which is inserted into the second blind hole (44).

7. The spray gun with a heating structure according to claim 1, characterized in that, The main body (1) is also provided with a valve air inlet device (5). At least two sets of air inlets (14) are opened on the top of the main body (1). The air inlets (14) are respectively connected to the valve air inlet device (5). At least two sets of air outlets (15) are opened on the front side of the main body (1). The two air inlets (14) are connected to the two air outlets (15) to form a pipeline for conveying gas. The two air outlets (15) are respectively connected to two needle valves (3).

8. The spray gun with a heating structure according to claim 7, characterized in that, The valve air intake device (5) includes a solenoid valve (51) and at least two air intake pipes (52). The output end of the solenoid valve (51) is connected to one end of the two air intake pipes (52), and the other end of the two air intake pipes (52) is connected to two air intake holes (14) respectively. The top of the solenoid valve (51) is provided with an input end. After the air enters the input end of the solenoid valve (51), it flows from the output end to the air intake pipe (52) and then flows from the air intake pipe (52) into the needle valve (3).

9. The spray gun with a heating structure according to claim 1, characterized in that, The main body (1) has a second glue inlet hole (17), which is located on the side of the main body (1) adjacent to the first glue inlet hole (12). The second glue inlet hole (17) is connected to the filter chamber (11) for conveying the glue to the filter chamber (11) for filtration.

10. The spray gun with a heating structure according to claim 1, characterized in that, The filter chamber (11) is provided with at least two first flow channels (13), and the front side of the body (1) is provided with at least two needle valves (3). One end of the two first flow channels (13) is connected to the filter chamber (11), and the other end of the two first flow channels (13) is connected to the input end of the two needle valves respectively.

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