A hot melt adhesive spraying device and process method for longitudinal packaging production

Abstract

The application belongs to the cable production field, and particularly relates to a hot melt adhesive spraying device and process method for longitudinal wrapping production, which comprises a glue storage box, a heating box fixedly connected to the side of the glue storage box, a stand fixedly connected to the heating box, a glue inlet pipe fixedly connected to the side of the glue storage box, a pneumatic valve fixedly connected between the glue storage box and the heating box, heating sheets and a gas pressure regulating valve fixedly connected to the top of the heating box, a first gas inlet pipe and a second gas inlet pipe fixedly connected to the gas pressure regulating valve, and the bottom end of the first gas inlet pipe being fixedly connected to the pneumatic valve. The hot melt adhesive is sprayed onto the surface of the aluminum-plastic composite tape, the spraying of the hot melt adhesive is completed, the situation that too much hot melt adhesive is extruded by the original hot melt adhesive gun can be reduced, spiral coating makes the coating range uniform, the hot melt adhesive coating amount is reduced, the excess glue entering the core semi-conductive tape is reduced, the electrical performance and water resistance of the semi-conductive tape are not affected, and the hot melt adhesive amount is saved.

Description

Technical Field

[0001] This invention relates to the field of cable manufacturing, specifically to a hot melt adhesive spraying device and process for longitudinal wrapping production. Background Technology

[0002] Cables are devices that transmit electrical energy or signals. Longitudinal shielding is a production process for cables, which mainly involves covering the surface of the cable core with a layer of metal shielding.

[0003] In the current technology, cable production initially used double-sided aluminum-plastic composite tape to longitudinally wrap the wire core. Both sides of the double-sided aluminum-plastic composite tape had insulating adhesive, which affected the electrical performance of the cable. Now, it has been changed to spray hot melt adhesive on single-sided aluminum-plastic composite tape. As a result, hot melt adhesive machines and hot melt adhesive spray guns have been used. Hot melt adhesive is sprayed onto the inner surface edge of the aluminum tape and then pressed and bonded in the cable forming mold.

[0004] However, the hot melt adhesive sprayed by the existing dropper spray gun is in strip shape. After entering the molding die, the strip adhesive is squeezed into the cable core, thus affecting the resistance of the semiconducting strip on the core. Therefore, in order to solve the above problems, a hot melt adhesive spraying device and process method for longitudinal packaging production is proposed. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the problem that in the prior art, the hot melt adhesive sprayed by the dropper spray gun is in strip shape, and after entering the molding mold, the strip-shaped adhesive will be squeezed into the cable core, thereby affecting the resistance of the semiconducting strip on the core.

[0006] To solve the above-mentioned technical problems, the present invention provides a hot melt adhesive spraying device for longitudinal packaging production, including an adhesive storage box; a heating box is fixedly connected to the side of the adhesive storage box; a support frame is fixedly connected to the heating box; an adhesive inlet pipe is fixedly connected to the side of the adhesive storage box; a pneumatic valve is fixedly connected between the adhesive storage box and the heating box; a heating element and a pressure regulating valve are fixedly connected to the top of the heating box; a first air supply pipe and a second air supply pipe are fixedly connected to the pressure regulating valve; the bottom end of the first air supply pipe is fixedly connected to the pneumatic valve; an adhesive feeding pipe is fixedly connected to the side of the heating box; an adhesive outlet groove is opened on the side of the heating box; the heating box and the adhesive feeding pipe are interconnected through the adhesive outlet groove; a lower adhesive pipe is fixedly connected to the bottom end of the adhesive feeding pipe. The upper air pipe is fixedly connected to the middle of the upper adhesive tube; the lower air pipe is provided at the bottom end of the upper air pipe; the bottom end of the second air supply pipe is fixedly connected to the upper air pipe; the bottom end of the lower adhesive tube is connected to a nozzle by a thread; the bottom of the nozzle has one adhesive hole and multiple air holes; the adhesive hole is located at the center of the multiple air holes; the bottom end of the lower air pipe is fixedly connected to a guide tube; the bottom end of the guide tube corresponds to the position of the adhesive hole. With the above configuration, after the liquid hot melt adhesive is extruded, it is driven to rotate by the heated gas in the air hole and sprayed out in a spiral mist. Then the hot melt adhesive is sprayed onto the surface of the aluminum-plastic composite belt to complete the hot melt adhesive spraying. This can reduce the situation where too much hot melt adhesive is extruded by the original hot melt glue gun.

[0007] In one embodiment of the present invention, an impeller is rotatably connected between the upper and lower adhesive tubes; blades are fixedly attached to the middle of the impeller; multiple stirring blades are fixedly attached to the surface of the impeller in a circumferential array; a rotating shaft is fixedly attached to the middle of the blades; and a negative pressure tube is fixedly attached to the top of the lower adhesive tube, thereby reducing air bubbles in the hot melt adhesive and thus reducing the impact on the uniformity of spraying.

[0008] In one embodiment of the present invention, a stirring seat is fixedly connected to the inner side wall of the lower glue tube at a position corresponding to the impeller; the cross-section of the stirring blade and the stirring seat are both trapezoidal; a spiral cylinder is fixedly connected to the bottom end of the impeller; and an extension tube is rotatably connected to the bottom end of the upper glue tube. Relying on the trapezoidal structure design of the stirring seat and the blade, the hot melt adhesive can flow downwards, thereby reducing the upward accumulation of hot melt adhesive and the situation where it is sucked out.

[0009] In one embodiment of the present invention, the top end of the glue-applying tube is threadedly connected to a screw; the bottom end of the screw is rotatably connected to a baffle and an adjusting rod; the baffle is located on the side of the glue outlet groove and is slidably connected to the inner wall of the glue-applying tube; the adjusting rod passes through the upper air pipe and is slidably connected to it; the bottom end of the adjusting rod is fixedly connected to a friction seat; the cross-section of the friction seat is trapezoidal; the top end of the rotating shaft is fixedly connected to multiple elastic plates; the end of the elastic plates away from the rotating shaft is fixedly connected to multiple friction blocks. Based on the above arrangement, the rotational speed of the rotating shaft, impeller, and screw drum can be adjusted, thereby reducing the situation where the amount of hot melt adhesive conveyed by the screw drum exceeds the flow rate of the glue outlet groove, which would otherwise lead to uneven glue spraying.

[0010] In one embodiment of the present invention, a through groove is provided in the middle of the stirring blade; elastic rods are fixedly connected to both the upper and lower sides of the through groove; a magnetic block is fixedly connected between two elastic rods; an elastic membrane is fixedly connected to both sides of the through groove; the elastic membrane is fixedly connected to the magnetic block; a plurality of magnetic sheets are fixedly connected to the surface of the lower glue tube at positions corresponding to the magnetic block. Vibration is generated by the above arrangement, and the vibration of the hot melt adhesive can help to break bubbles, thereby facilitating the defoaming of the hot melt adhesive.

[0011] In one embodiment of the present invention, a plurality of air grooves are provided on the inner sidewall of the stirring base; a plurality of vertical rods are slidably connected to the top end of the lower glue tube at a position corresponding to the air grooves; a first spring is fixedly connected between the top end of the vertical rod and the lower glue tube; an arc-shaped rod is fixedly connected to the top surface of the extension tube; a round rod is fixedly connected to the side of the vertical rod near the arc-shaped rod; a connecting rod is fixedly connected between the inner sidewall of the extension tube and the stirring blade. With the above arrangement, the hot melt adhesive located at the bottom of the stirring base can be easily vented through the punctured channel.

[0012] In one embodiment of the present invention, a connecting ring is fixedly attached to the surface of the lower tube; a plurality of covers are bolted to the bottom side of the connecting ring; the nozzle is located at the center of the cover, and the cover covers the lower tube to reduce the interference of external airflow on the airflow ejected from the nozzle.

[0013] In one embodiment of the present invention, a bracket is fixedly attached to the surface of the cover; pressing legs are hinged to both sides of the bracket; a second spring is rotatably connected between the two pressing legs; a pair of pressing wheels are rotatably connected to the bottom ends of the two pressing legs, and the pressing wheels at the bottom of the pressing legs can press down on the aluminum-plastic composite belt, thereby fixing the aluminum-plastic composite belt and reducing the shaking of the aluminum-plastic composite belt.

[0014] In one embodiment of the present invention, a drain pipe and a guide shield are fixedly connected to the bottom of the cover; the guide shield is located on the side of the drain pipe; the drain pipe has a C-shaped structure design; the cross-section of the drain pipe has an "eight" shaped structure design on the side near the center of the cover. With the above settings, the airflow can be concentrated and the airflow can be sprayed to a single side, thereby improving the cleaning effect on the aluminum-plastic composite belt.

[0015] A hot melt adhesive spraying process for longitudinal packaging production, applicable to the aforementioned hot melt adhesive spraying apparatus for longitudinal packaging production, includes the following steps:

[0016] S1: Remove the aluminum-plastic composite tape from the tape unloading rack and flatten it on the flattening conveyor belt. The cable is located in the middle of the aluminum-plastic composite tape and enters the aluminum-plastic longitudinal wrapping aircraft mold together.

[0017] S2: Start the air compressor, then control the air pressure regulating valve, then the compressed air passes through the first air supply pipe to control the pneumatic valve to open, while simultaneously regulating the air pressure in the second air supply pipe, and then powering on the heating element;

[0018] S3: Start the hot melt glue machine. The hot melt glue machine injects hot melt glue into the glue storage box through the glue inlet pipe. Then, the hot melt glue and compressed air enter the glue outlet pipe and the air outlet pipe respectively. As the compressed air flows through the second air outlet pipe, the hot melt glue wrapped on the surface of the second air outlet pipe heats the compressed air.

[0019] S4: Hot melt adhesive and compressed air are ejected from the adhesive nozzle and air nozzle, respectively. After being extruded, the liquid hot melt adhesive is rotated by the heated gas in the air nozzle, and sprayed out in a spiral mist. The hot melt adhesive is then sprayed onto the surface of the aluminum-plastic composite strip, completing the hot melt adhesive spraying process.

[0020] The technical solution of the present invention has the following advantages compared with the prior art:

[0021] 1. This invention, by setting up a pressure regulating valve, a second air supply pipe, an upper air pipe, a lower air pipe, and a nozzle, allows the liquid hot melt adhesive to be extruded and rotated by the heated gas in the air hole during use. After being sprayed out, it forms a spiral mist and is then sprayed onto the surface of the aluminum-plastic composite strip, thus completing the hot melt adhesive spraying. This reduces the situation where the original hot melt glue gun extrudes too much hot melt adhesive. The spiral coating makes the coating area uniform, reduces the amount of hot melt adhesive coated, and reduces the amount of excess glue entering the wire core semiconducting strip, which affects the electrical performance and water-blocking performance of the semiconducting strip, thus saving the amount of hot melt adhesive used.

[0022] 2. This invention, by setting up an impeller, blades, a rotating shaft, a negative pressure pipe, and a stirring blade, connects the negative pressure pipe to a vacuum pump during use to extract gas, creating a negative pressure area at the top of the adhesive tube. The compressed airflow then drives the blades to rotate, which in turn drives the impeller and stirring blades to rotate. The rotation of the stirring blades causes air bubbles in the hot melt adhesive to burst, and the air is then extracted and discharged by the negative pressure pipe. This reduces the number of air bubbles in the hot melt adhesive, thereby reducing its impact on the uniformity of the spraying. Attached Figure Description

[0023] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0024] Figure 1 This is a schematic diagram of the method flow of the present invention;

[0025] Figure 2 This is a schematic diagram of the structure of the present invention;

[0026] Figure 3 This is a schematic diagram of the heating box structure of the present invention;

[0027] Figure 4 This is a schematic diagram of the adhesive tube structure of the present invention;

[0028] Figure 5 This is a schematic diagram of the lower hose structure of the present invention;

[0029] Figure 6 This is a schematic diagram of the impeller structure of the present invention;

[0030] Figure 7 This is a schematic diagram of the structure of the cover of the present invention.

[0031] In the diagram: 11. Stand; 12. Glue storage box; 13. Heating box; 14. Air pressure regulating valve; 15. Heating element; 16. Pneumatic valve; 17. Glue outlet; 18. Glue supply pipe; 19. Air supply pipe; 191. Glue supply pipe; 192. Air supply pipe; 193. Nozzle; 194. Glue hole; 195. Air hole; 196. Glue guide pipe; 21. Impeller; 22. Stirring blade; 23. Rotating shaft; 24. Negative pressure pipe; 31. Stirring base; 32. Extension tube; 33. Spiral cylinder; 41. Screw; 42. Baffle; 43. Adjusting rod; 44. Friction seat; 45. Elastic sheet; 46. Friction block; 51. Air groove; 52. Vertical rod; 53. Arc rod; 61. Elastic rod; 62. Magnetic block; 63. Magnetic sheet; 64. Elastic membrane; 71. Connecting ring; 72. Cover; 81. Support; 82. Pressing leg; 83. Pressing wheel; 91. Drainage tube; 92. Flow guide cover. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0033] Reference Figure 2-5 As shown, a hot melt adhesive spraying device for longitudinal packaging production according to the present invention includes an adhesive storage box 12; a heating box 13 is fixedly connected to the side of the adhesive storage box 12; a stand 11 is fixedly connected to the heating box 13; an adhesive inlet pipe is fixedly connected to the side of the adhesive storage box 12; a pneumatic valve 16 is fixedly connected between the adhesive storage box 12 and the heating box 13; a heating element 15 and a pressure regulating valve 14 are fixedly connected to the top of the heating box 13; a first air supply pipe and a second air supply pipe are fixedly connected to the pressure regulating valve 14; the bottom end of the first air supply pipe is fixedly connected to the pneumatic valve 16; an adhesive application pipe 18 is fixedly connected to the side of the heating box 13; an adhesive outlet groove 17 is opened on the side of the heating box 13; the heating box... 13 and the upper glue tube 18 are interconnected via the glue outlet groove 17; the bottom end of the upper glue tube 18 is fixedly connected to the lower glue tube 191; the middle part of the upper glue tube 18 is fixedly connected to the upper air tube 19; the bottom end of the upper air tube 19 is provided with the lower air tube 192; the bottom end of the second air supply tube is fixedly connected to the upper air tube 19; the bottom end of the lower glue tube 191 is connected to the nozzle 193 by a thread; the bottom of the nozzle 193 has a glue hole 194 and multiple air holes 195; the glue hole 194 is located at the center of the multiple air holes 195; the bottom end of the lower air tube 192 is fixedly connected to the glue guide tube 196; the bottom end of the glue guide tube 196 corresponds to the position of the glue hole 194.

[0034] Before use, connect the hot melt glue machine to the glue inlet pipe, and connect the air compressor to the air pressure regulating valve 14 through a pipe. Start the air compressor, and then control the air pressure regulating valve 14. Compressed air then controls the pneumatic valve 16 to open through the first air supply pipe. The pneumatic valve 16 is used to control the switch between the glue storage box 12 and the heating box 13, and simultaneously adjusts the gas pressure of the second air supply pipe to adjust the spiral size of the hot melt glue. Then, energize the heating element 15, which heats the metal heating box 13 to keep the hot melt glue in a liquid state. Start the hot melt glue machine, which injects the hot melt glue into the glue storage box 12 through the glue inlet pipe. Then, the hot melt glue passes through the glue outlet 17 and enters the glue inlet pipe 18. After that, the hot melt glue and compressed air enter the glue outlet pipe 191 and the air outlet pipe 192, respectively. The hot melt glue and compressed air exit from the nozzle 1. The hot melt adhesive is sprayed out through the glue hole 194 and air hole 195 of the 93. After being extruded, the liquid hot melt adhesive is rotated by the heated gas in the air hole 195 and sprayed out in a spiral mist. Then, the hot melt adhesive is sprayed onto the surface of the aluminum-plastic composite strip to complete the hot melt adhesive spraying. This can reduce the situation where too much hot melt adhesive is extruded by the original hot melt glue gun, and when the aluminum strip is bonded, too much hot melt adhesive is squeezed into the semi-conductive strip inside the wire core, which affects the electrical performance and water resistance of the semi-conductive strip. It also reduces the situation where excess hot melt adhesive flows out along the aluminum strip bonding opening, causing the hot melt adhesive to stick to the machine and the ground and be difficult to remove. At the same time, it improves the uniformity of coating. During the flow of compressed air in the second air supply pipe, the hot melt adhesive wrapped on the surface of the second air supply pipe can heat the compressed air, reducing the heat dissipation of the gas on the hot melt adhesive, thus preventing the hot melt adhesive from being in a liquid state.

[0035] Furthermore, such as Figure 3-6 As shown, an impeller 21 is rotatably connected between the upper glue tube 18 and the lower glue tube 191; blades are fixedly attached to the middle of the impeller 21; multiple stirring blades 22 are fixedly attached to the surface of the impeller 21 in a circumferential array; a rotating shaft 23 is fixedly attached to the middle of the blades; a negative pressure tube 24 is fixedly attached to the top of the lower glue tube 191; during use, the hot melt glue machine uses a stirring method to quickly heat the glue to facilitate rapid melting of the glue, resulting in a large number of air bubbles being trapped in the liquid hot melt glue. These air bubbles have little impact on existing hot melt glue guns, but the present invention has a significant impact on the hot melt glue gun. During the process, the bursting of these bubbles can disrupt the airflow and affect the uniformity of the atomized hot melt adhesive spraying. In this embodiment of the invention, the negative pressure pipe 24 is connected to a vacuum pump to extract gas, creating a negative pressure area at the top of the adhesive application pipe 18. The compressed airflow then drives the blades to rotate, which in turn drives the impeller 21 and the stirring blade 22 to rotate. The rotation of the stirring blade 22 causes the bubbles in the hot melt adhesive to burst, and the air is then extracted and discharged by the negative pressure pipe 24. This reduces the number of bubbles in the hot melt adhesive, thereby reducing the impact on the uniformity of the spraying.

[0036] Furthermore, such as Figure 3-5 As shown, a stirring seat 31 is fixedly connected to the inner wall of the lower glue tube 191 at a position corresponding to the impeller 21; both the stirring blade 22 and the stirring seat 31 have trapezoidal cross-sections; a spiral cylinder 33 is fixedly connected to the bottom end of the impeller 21; and an extension tube 32 is rotatably connected to the bottom end of the upper glue tube 18. In use, hot melt glue is injected above the stirring blade 22 via the extension tube 32, thereby forming a cavity of a certain volume between the lower glue tube 191 and the extension tube 32. This reduces the possibility of hot melt glue accumulating and blocking the negative pressure tube 24, causing it to be sucked out. The trapezoidal design of the stirring seat 31 and the blade facilitates the downward flow of hot melt glue, further reducing the possibility of hot melt glue accumulating upward and being sucked out. The impeller 21 drives the spiral cylinder 33 to rotate and transport the hot melt glue downward, thereby reducing the possibility of external air entering the lower glue tube 191 due to the influence of external air pressure difference, causing the hot melt glue to flow upward into the negative pressure tube 24.

[0037] Furthermore, such as Figure 3-6 As shown, the top end of the glue-applying tube 18 is threadedly connected to a screw 41; the bottom end of the screw 41 is rotatably connected to a baffle 42 and an adjusting rod 43; the baffle 42 is located on the side of the glue outlet 17 and is slidably connected to the inner wall of the glue-applying tube 18; the adjusting rod 43 passes through the upper air pipe 19 and is slidably connected to it; the bottom end of the adjusting rod 43 is fixedly connected to a friction seat 44; the cross-section of the friction seat 44 is trapezoidal; the top end of the rotating shaft 23 is fixedly connected to multiple elastic plates 45; the end of the elastic plate 45 away from the rotating shaft 23 is fixedly connected to multiple friction blocks 46; in use, the operator can rotate the screw 41 to move the baffle 42, and the glue flow rate of the glue outlet 17 can be adjusted by relying on the baffle 42, thereby facilitating the adjustment of the glue spraying amount. During the process, the screw 41 drives the adjusting rod 43 to slide into the upper air pipe 19. Then, the adjusting rod 43 drives the friction seat 44 to move. Since the cross-section of the friction seat 44 is trapezoidal, the distance between the friction block 46 and its inner sidewall can be adjusted by the movement of the friction seat 44. During the rotation of the impeller 21, the rotating shaft 23 drives the elastic plate 45 and the friction block 46 to rotate. Then, under the action of centrifugal force, multiple friction blocks 46 move outward. By adjusting the position of the friction seat 44, the distance between the friction block 46 and its inner sidewall can be adjusted. In this way, the rotation speed of the rotating shaft 23, the impeller 21 and the screw drum 33 can be adjusted, thereby reducing the situation where the amount of hot melt adhesive conveyed by the screw drum 33 is greater than the flow rate of the glue outlet 17, which would lead to uneven glue spraying.

[0038] Furthermore, such as Figure 4-6As shown, a through groove is provided in the middle of the stirring blade 22; elastic rods 61 are fixed to both the upper and lower sides of the through groove; a magnetic block 62 is fixed between two elastic rods 61; an elastic membrane 64 is fixed to both sides of the through groove; the elastic membrane 64 is fixed to the magnetic block 62; multiple magnetic sheets 63 are fixed to the surface of the lower glue tube 191 at positions corresponding to the magnetic block 62; during use, as the impeller 21 and the stirring blade 22 rotate, the impeller 21 will drive the elastic rods 61 and the magnetic block 62 to rotate. The magnetic block 62 repels the external magnetic sheet 63. When the magnetic block 62 approaches the magnetic sheet 63, the elastic rod 61 will bend; when it moves away from the magnetic sheet 63, the magnetic block 62 will return to its original position and generate vibration. The vibration of the hot melt adhesive can help the bubbles to break, which can help remove bubbles from the hot melt adhesive.

[0039] Furthermore, such as Figure 4-5 As shown, the inner wall of the stirring base 31 is provided with multiple air grooves 51; multiple vertical rods 52 are slidably connected to the top of the lower rubber tube 191 at positions corresponding to the air grooves 51; a first spring is fixedly connected between the top of the vertical rod 52 and the lower rubber tube 191; an arc-shaped rod 53 is fixedly connected to the top surface of the extension tube 32; a round rod is fixedly connected to the side of the vertical rod 52 near the arc-shaped rod 53; a connecting rod is fixedly connected between the inner wall of the extension tube 32 and the stirring blade 22; during use, the impeller 2... Rotation 1 will cause the extension tube 32 and the arc rod 53 to rotate. Then the arc rod 53 will rotate and squeeze the round rod on the vertical rod 52, thereby causing the vertical rod 52 to poke the air groove 51 downwards and clear the air groove 51. The channel created by the poke can facilitate the venting of the hot melt adhesive located at the bottom of the mixing seat 31. The first spring is used to reset the vertical rod 52. By setting multiple vertical rods 52, the vertical rods 52 can be pressed alternately, so that one of the multiple air grooves 51 remains unobstructed, thereby facilitating the venting.

[0040] Furthermore, such as Figure 2 and 7 As shown, a connecting ring 71 is fixedly attached to the surface of the lower tube 191; multiple covers 72 are bolted to the bottom side of the connecting ring 71; the nozzle 193 is located at the center of the cover 72; in use, by setting the cover 72 to cover the lower tube 191, the interference of external airflow on the airflow sprayed from the nozzle 193 can be reduced, and the sprayed air will be sprayed outward from the gap between the cover 72 and the aluminum-plastic composite belt, thereby cleaning the aluminum-plastic composite belt and reducing foreign matter adhering to the surface of the aluminum-plastic composite belt.

[0041] Furthermore, such as Figure 2 and 7As shown, a bracket 81 is fixedly attached to the surface of the cover 72; pressing legs 82 are hinged to both sides of the bracket 81; a second spring is rotatably connected between the two pressing legs 82; a pair of pressing wheels 83 are rotatably connected to the bottom ends of the two pressing legs 82; during use, the sprayed airflow impacts the aluminum-plastic composite belt, which easily causes the aluminum-plastic composite belt to shake. In this embodiment of the invention, the pressing wheels 83 at the bottom of the pressing legs 82 can press down on the aluminum-plastic composite belt, thereby fixing the aluminum-plastic composite belt, reducing the shaking of the aluminum-plastic composite belt, and thus reducing the impact of the aluminum-plastic composite belt on the uniformity of spraying. At the same time, the second spring pulls the two pressing legs 82, thereby keeping the pressing wheels 83 fixed to the aluminum-plastic composite belt, and facilitating the fixing of aluminum-plastic composite belts of different sizes and specifications.

[0042] Furthermore, such as Figure 2 and 7 As shown, the bottom of the cover 72 is fixedly connected to a drain pipe 91 and a guide shroud 92; the guide shroud 92 is located on the side of the drain pipe 91; the drain pipe 91 has a C-shaped structure design; the cross-section of the drain pipe 91 near the center of the cover 72 has an "eight" shaped structure design; in use, the airflow will spray out from the bottom of the guide shroud 92 to all sides, and then, guided by the drain shroud, the airflow will be directed to the direction of the guide shroud 92, and then sprayed out from the side of the guide shroud 92. This can reduce the concentration of the sprayed airflow, so that the airflow is sprayed out to a single side, thereby improving the cleaning effect on the aluminum-plastic composite belt. The "eight" shaped structure design of the cross-section of the drain pipe 91 near the center of the cover 72 can prevent the airflow from flowing back out of the drain pipe 91 and disturbing the airflow when it collides with the inner wall of the drain pipe 91 after entering the drain pipe 91.

[0043] like Figure 1 As shown, a hot melt adhesive spraying process for longitudinal packaging production is described. This method is applicable to the aforementioned hot melt adhesive spraying device for longitudinal packaging production. The process includes the following steps:

[0044] S1: Remove the aluminum-plastic composite tape from the tape unloading rack and flatten it on the flattening conveyor belt. The cable is located in the middle of the aluminum-plastic composite tape and enters the aluminum-plastic longitudinal wrapping aircraft mold together.

[0045] S2: Start the air compressor, then control the air pressure regulating valve 14, then the compressed air controls the pneumatic valve 16 to open through the first air supply pipe, while adjusting the air pressure of the second air supply pipe, and then powering on the heating element 15.

[0046] S3: Start the hot melt glue machine. The hot melt glue machine injects hot melt glue into the glue storage box 12 through the glue inlet pipe. Then the hot melt glue and compressed air enter the glue outlet pipe 191 and the air outlet pipe 192 respectively. During the flow of compressed air in the second air outlet pipe, the hot melt glue wrapped on the surface of the second air outlet pipe heats the compressed air.

[0047] S4: Hot melt adhesive and compressed air are sprayed out from the adhesive hole 194 and air hole 195 of the nozzle 193, respectively. After the liquid hot melt adhesive is extruded, it is driven to rotate by the heated gas in the air hole 195. After being sprayed out, it is in the form of a spiral mist. Then the hot melt adhesive is sprayed onto the surface of the aluminum-plastic composite strip to complete the hot melt adhesive spraying.

[0048] Working principle: Before use, connect the hot melt glue machine to the glue inlet pipe, and connect the air compressor to the air pressure regulating valve 14 through a pipe. Start the air compressor, and then control the air pressure regulating valve 14. Compressed air then controls the pneumatic valve 16 to open through the first air supply pipe. The pneumatic valve 16 controls the switch between the glue storage box 12 and the heating box 13, and simultaneously adjusts the gas pressure in the second air supply pipe to adjust the spiral size of the hot melt glue. Then, energize the heating element 15, which heats the metal heating box 13 to keep the hot melt glue in a liquid state. Start the hot melt glue machine, and the machine injects the hot melt glue into the glue storage box 12 through the glue inlet pipe. Then, the hot melt glue passes through the glue outlet trough 17 and enters the glue inlet pipe 18. After that, the hot melt glue and compressed air enter the glue outlet pipe 191 and the air outlet pipe 192, respectively. The hot melt glue and compressed air are sprayed from the nozzles... The hot melt adhesive is sprayed out from the glue hole 194 and air hole 195 of the head 193. After being extruded, the liquid hot melt adhesive is rotated by the heated gas in the air hole 195 and sprayed out in a spiral mist. Then the hot melt adhesive is sprayed onto the surface of the aluminum-plastic composite strip to complete the hot melt adhesive spraying. This can reduce the situation where too much hot melt adhesive is extruded from the original hot melt glue gun, and when the aluminum strip is bonded, too much hot melt adhesive is squeezed into the semi-conductive strip inside the wire core, which affects the electrical performance and water resistance of the semi-conductive strip. It also reduces the situation where excess hot melt adhesive flows out along the aluminum strip bonding opening, causing the hot melt adhesive to stick to the machine and the ground and be difficult to remove. At the same time, it improves the uniformity of coating. During the flow of compressed air in the second air supply pipe, the hot melt adhesive wrapped on the surface of the second air supply pipe can heat the compressed air, reducing the heat dissipation of the gas on the hot melt adhesive, thus preventing the hot melt adhesive from being in a liquid state.

[0049] During use, hot melt glue machines employ stirring to rapidly heat the glue for quick melting, resulting in a large number of air bubbles trapped within the liquid glue. While these bubbles have minimal impact on existing hot melt glue guns, in this invention, their bursting disrupts airflow and affects the uniformity of the atomized hot melt glue spray. In this embodiment, the negative pressure pipe 24 is connected to a vacuum pump to extract gas, creating a negative pressure area at the top of the glue application pipe 18. The compressed airflow then drives the blades to rotate, which in turn rotates the impeller 21 and the stirring blade 22. The rotation of the stirring blade 22 causes the air bubbles within the hot melt glue to burst, and the air is then extracted and discharged by the negative pressure pipe 24. This reduces air bubbles in the hot melt adhesive, thus minimizing its impact on the uniformity of the spray. The hot melt adhesive is injected above the stirring blade 22 via the extension tube 32, creating a cavity of a certain volume between the lower adhesive tube 191 and the extension tube 32. This reduces the likelihood of hot melt adhesive accumulating and blocking the negative pressure tube 24, causing it to be sucked out. The trapezoidal structure design of the stirring seat 31 and the blades facilitates the downward flow of the hot melt adhesive, reducing the likelihood of it accumulating upward and being sucked out. The impeller 21 drives the spiral drum 33 to rotate and transport the hot melt adhesive downwards, thus reducing the likelihood of external air entering the lower adhesive tube 191 due to the influence of external air pressure differences, causing the hot melt adhesive to flow upwards into the negative pressure tube 24.

[0050] During use, the operator can rotate the screw 41 to move the baffle 42. The baffle 42 can be used to adjust the flow rate of glue in the glue tank 17, thereby facilitating the adjustment of the glue spraying amount. During the adjustment process, the screw 41 will drive the adjusting rod 43 to slide into the air pipe 19. Then, the adjusting rod 43 will drive the friction seat 44 to move. Since the cross-section of the friction seat 44 is trapezoidal, the movement of the friction seat 44 can adjust the distance between the friction block 46 and its inner sidewall. During the rotation of the impeller 21, the rotating shaft 23 can drive the elastic plate 45 and the friction block 46 to rotate. Then, under the action of centrifugal force, multiple friction blocks 46 move outward. By adjusting the position of the friction seat 44, the distance between the friction block 46 and its inner sidewall can be adjusted. This can adjust the rotation speed of the rotating shaft 23, the impeller 21, and the screw drum 33, thereby reducing the situation where the amount of hot melt glue conveyed by the screw drum 33 is greater than the flow rate of the glue tank 17, which would lead to uneven glue spraying.

[0051] During the rotation of impeller 21 and stirring blade 22, impeller 21 drives elastic rod 61 and magnetic block 62 to rotate. Magnetic block 62 repels external magnetic sheet 63. When magnetic block 62 approaches magnetic sheet 63, elastic rod 61 bends. When it moves away from magnetic sheet 63, magnetic block 62 returns to its original position and vibrates. The vibration helps the hot melt adhesive to break bubbles, which is beneficial for defoaming the hot melt adhesive. The rotation of impeller 21 drives extension tube 32 and arc rod 53 to rotate. Then, arc rod 53 rotates and squeezes the round rod on vertical rod 52, which causes vertical rod 52 to poke the air groove 51 downwards and clear the air groove 51. The punctured channel facilitates the venting of hot melt adhesive at the bottom of stirring seat 31. The first spring is used to reset vertical rod 52. By setting multiple vertical rods 52, vertical rods 52 can be pressed alternately, so that one of the multiple air grooves 51 remains unobstructed, which facilitates venting.

[0052] By using a cover 72 to enclose the lower adhesive tube 191, interference from external airflow on the airflow emitted from the nozzle 193 can be reduced. The emitted air exits through the gap between the cover 72 and the aluminum-plastic composite belt, cleaning the belt and reducing foreign matter adhering to its surface. The ejected airflow impacts the aluminum-plastic composite belt, which can easily cause it to vibrate. In this embodiment, the pressing rollers 83 at the bottom of the pressing legs 82 press down on the aluminum-plastic composite belt, thus fixing it in place and reducing vibration, thereby minimizing its impact on coating uniformity. Simultaneously, a second spring pulls the two pressing legs 82. This ensures that the pressing roller 83 secures the aluminum-plastic composite belt and facilitates the fixing of aluminum-plastic composite belts of different sizes and specifications. Airflow is ejected from the bottom of the guide hood 92 outwards. Guided by the guide hood, this airflow is directed towards the guide hood 92 and then ejected from the side of the guide hood 92. This reduces the concentration of the ejected airflow, allowing it to be ejected to a single side, thereby improving the cleaning effect on the aluminum-plastic composite belt. The cross-section of the guide pipe 91, near the center of the hood 72, has an "eight"-shaped structure. This design prevents the airflow from flowing back out of the guide pipe 91 and disrupting the airflow when it collides with the inner wall of the guide pipe 91.

[0053] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A hot melt adhesive spraying device for longitudinal packaging production, characterized in that: The system includes a glue storage box (12); a heating box (13) is fixedly connected to the side of the glue storage box (12); a stand (11) is fixedly connected to the heating box (13); a glue inlet pipe is fixedly connected to the side of the glue storage box (12); a pneumatic valve (16) is fixedly connected between the glue storage box (12) and the heating box (13); a heating element (15) and a pressure regulating valve (14) are fixedly connected to the top of the heating box (13); a first air supply pipe and a second air supply pipe are fixedly connected to the pressure regulating valve (14); the bottom end of the first air supply pipe is fixedly connected to the pneumatic valve (16); a glue application pipe (18) is fixedly connected to the side of the heating box (13); a glue outlet groove (17) is opened on the side of the heating box (13); and a space between the heating box (13) and the glue application pipe (18) is provided. The upper glue tube (18) is connected to the lower glue tube (191) at its bottom end; the upper glue tube (18) is connected to the middle of the upper air tube (19); the lower air tube (192) is provided at the bottom end of the upper air tube (19); the bottom end of the second air supply tube is connected to the upper air tube (19); the bottom end of the lower glue tube (191) is connected to the nozzle (193) by a thread; the bottom of the nozzle (193) has a glue hole (194) and multiple air holes (195); the glue hole (194) is located at the center of the multiple air holes (195); the bottom end of the lower air tube (192) is connected to the glue guide tube (196); the bottom end of the glue guide tube (196) corresponds to the position of the glue hole (194); An impeller (21) is rotatably connected between the upper rubber tube (18) and the lower rubber tube (191); blades are fixedly connected to the middle of the impeller (21); multiple stirring blades (22) are fixedly connected to the surface of the impeller (21) in a circumferential array; a rotating shaft (23) is fixedly connected to the middle of the blades; and a negative pressure tube (24) is fixedly connected to the top of the lower rubber tube (191). The top end of the glue-applying tube (18) is connected to a screw (41) by a thread; the bottom end of the screw (41) is rotatably connected to a baffle (42) and an adjusting rod (43); the baffle (42) is located on the side of the glue outlet groove (17) and is slidably connected to the inner wall of the glue-applying tube (18); the adjusting rod (43) passes through the upper air pipe (19) and is slidably connected to it; the bottom end of the adjusting rod (43) is fixedly connected to a friction seat (44); the cross section of the friction seat (44) is trapezoidal; the top end of the rotating shaft (23) is fixedly connected to a plurality of elastic plates (45); the end of the elastic plate (45) away from the rotating shaft (23) is fixedly connected to a plurality of friction blocks (46).

2. The hot melt adhesive spraying device for longitudinal packaging production according to claim 1, characterized in that: A stirring seat (31) is fixedly connected to the inner wall of the lower rubber tube (191) at the position corresponding to the impeller (21); the cross-section of the stirring blade (22) and the stirring seat (31) are both trapezoidal; a spiral cylinder (33) is fixedly connected to the bottom end of the impeller (21); and an extension tube (32) is rotatably connected to the bottom end of the upper rubber tube (18).

3. The hot melt adhesive spraying device for longitudinal packaging production according to claim 2, characterized in that: The stirring blade (22) has a through groove in the middle; elastic rods (61) are fixed to both the upper and lower sides of the through groove; a magnetic block (62) is fixed between the two elastic rods (61); an elastic membrane (64) is fixed to both sides of the through groove; the elastic membrane (64) is fixed to the magnetic block (62); and multiple magnetic sheets (63) are fixed to the surface of the lower tube (191) at positions corresponding to the magnetic block (62).

4. The hot melt adhesive spraying device for longitudinal packaging production according to claim 2, characterized in that: The inner wall of the stirring seat (31) is provided with multiple air grooves (51); the top of the lower rubber tube (191) is slidably connected with multiple vertical rods (52) at the corresponding positions of the air grooves (51); the top of the vertical rod (52) is fixedly connected to the lower rubber tube (191) with a first spring; an arc-shaped rod (53) is fixedly connected to the top surface of the extension tube (32); a round rod is fixedly connected to the side of the vertical rod (52) near the arc-shaped rod (53); a connecting rod is fixedly connected between the inner wall of the extension tube (32) and the stirring blade (22).

5. The hot melt adhesive spraying device for longitudinal packaging production according to claim 1, characterized in that: A connecting ring (71) is fixedly attached to the surface of the lower tube (191); a plurality of covers (72) are bolted to the bottom side of the connecting ring (71); the nozzle (193) is located at the center of the cover (72).

6. The hot melt adhesive spraying device for longitudinal packaging production according to claim 5, characterized in that: A bracket (81) is fixedly attached to the surface of the cover (72); pressing legs (82) are hinged to both sides of the bracket (81); a second spring is rotatably connected between the two pressing legs (82); a pair of pressing wheels (83) are rotatably connected to the bottom ends of the two pressing legs (82).

7. The hot melt adhesive spraying device for longitudinal packaging production according to claim 5, characterized in that: The bottom of the cover (72) is fixed with a drainage pipe (91) and a flow guide (92); the flow guide (92) is located on the side of the drainage pipe (91); the drainage pipe (91) has a C-shaped structure design; the cross section of the drainage pipe (91) is in the shape of an "eight" on the side near the center of the cover (72).

8. A process for spraying hot melt adhesive for longitudinal packaging production, characterized by: This method is applicable to the hot melt adhesive spraying apparatus for longitudinal packaging production as described in any one of claims 1-7, and the process includes the following steps: S1: Remove the aluminum-plastic composite tape from the tape unloading rack and flatten it on the flattening conveyor belt. The cable is located in the middle of the aluminum-plastic composite tape and enters the aluminum-plastic longitudinal wrapping aircraft mold together. S2: Start the air compressor, then control the air pressure regulating valve (14), then the compressed air is controlled by the first air supply pipe to open the pneumatic valve (16), while adjusting the air pressure of the second air supply pipe, and then powering on the heating element (15); S3: Start the hot melt glue machine. The hot melt glue machine injects hot melt glue into the glue storage box (12) through the glue inlet pipe. Then the hot melt glue and compressed air enter the glue outlet pipe (191) and the air outlet pipe (192) respectively. During the flow of compressed air in the second air outlet pipe, the hot melt glue wrapped on the surface of the second air outlet pipe heats the compressed air. S4: Hot melt adhesive and compressed air are sprayed out from the adhesive hole (194) and air hole (195) of the nozzle (193) respectively. After the liquid hot melt adhesive is extruded, it is driven to rotate by the heated gas in the air hole (195). After being sprayed out, it is in the form of a spiral mist. Then the hot melt adhesive is sprayed onto the surface of the aluminum-plastic composite belt to complete the hot melt adhesive spraying.

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