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CN-224221755-U - Hot melt adhesive spiral spray gun

CN224221755UCN 224221755 UCN224221755 UCN 224221755UCN-224221755-U

Abstract

The utility model relates to the technical field of spiral spray guns, in particular to a hot melt adhesive spiral spray gun which comprises a gun body, wherein an air flow heating cavity, an air inlet, an air guide hole, a cavity sealing piece and an electric heating rod are arranged at the bottom of the gun body, the electric heating rod is used for heating air flow entering the air flow heating cavity, the air flow heating cavity is formed by a plurality of curved channels, an adhesive spraying valve is connected and arranged on the gun body through screws, a through hole is arranged in the center of the adhesive spraying valve, a coaxial two-stage threaded seat, a nozzle, a biconical valve core and an air guide sleeve are sequentially arranged at the bottom of the adhesive spraying valve, and the stable spiral air flow field is formed by the conical matching structure of the air guide sleeve and the nozzle and the design of an air guide groove.

Inventors

  • CHEN WENHUA

Assignees

  • 江门市美勤仕机械制造有限公司

Dates

Publication Date
20260512
Application Date
20250429

Claims (10)

  1. 1. A spiral spray gun for hot melt adhesive, comprising: the gun body (1) is provided with an air flow heating cavity (101), an air inlet (102), an air guide hole (103), a cavity sealing piece (104) and an electric heating rod (105) at the bottom, wherein the electric heating rod (105) is used for heating air flow entering the air flow heating cavity (101), and the air flow heating cavity (101) is a channel formed by a plurality of bends; The glue spraying valve (2) is installed on the gun body (1) through screw connection, a through hole is formed in the center of the glue spraying valve, and a coaxial two-stage thread seat (3), a nozzle (4), a biconical valve core (5) and an air guide sleeve (6) are sequentially arranged at the bottom of the glue spraying valve (2); The top of the coaxial two-stage screw seat (3) is provided with a rubber channel hole (301) and penetrates through the bottom, the lower part of the rectangular surface of the coaxial two-stage screw seat (3) is provided with a small-stage external thread (302) and a large-stage external thread (303), one side surface of the coaxial two-stage screw seat is provided with an air inlet hole (304) communicated with the air guide hole (103), the end surface of the large-stage external thread (303) is provided with a plurality of vent holes (305), and the vent holes (305) are communicated with the air inlet hole (304) and are used for enabling heating air flow to flow into the air guide sleeve (6) in a directional manner; The spray nozzle (4) is fixed on the coaxial two-stage screw seat (3) through a small-stage external screw thread (302), a conical glue spraying hole (401) is formed in the center of the spray nozzle (4), a conical surface (402) is arranged on the periphery of the spray nozzle (4), the taper range of the conical glue spraying hole (401) is 20-24 degrees, and a plurality of air guide grooves (403) are formed in the conical surface (402); The air guide sleeve (6) is fixed on the coaxial two-stage screw seat (3) through a large-stage external screw thread (303), a conical through hole (601) is formed in the air guide sleeve (6), and the air guide sleeve is matched with a peripheral conical surface (402) of the nozzle (4) to form a spiral air guide slot hole with the air guide groove (403).
  2. 2. A hot melt adhesive screw lance as set forth in claim 1, wherein said small external threads (302) match the internal threads of said nozzle (4) and said large external threads (303) match the internal threads of said air guide sleeve (6).
  3. 3. A hot melt adhesive spiral spray gun according to claim 1, characterized in that the port of the conical through hole (601) of the air guide sleeve (6) is jointed with the peripheral conical surface (402) of the nozzle (4), and the air guide groove (403) forms a continuous spiral air guide channel after the port and the peripheral conical surface are jointed.
  4. 4. A hot melt adhesive screw lance as set forth in claim 1, wherein the air vent (103) of the air flow heating chamber (101) is in coaxial communication with the air inlet (304) of the coaxial two-stage screw seat (3).
  5. 5. The hot melt adhesive spiral spray gun according to claim 1, wherein the air guide grooves (403) of the nozzle (4) are inclined grooves, the number of the air guide grooves (403) is 4-8, the groove depths are 0.5-1.2mm, the air guide grooves are uniformly distributed on the peripheral conical surface (402), the included angle between the central axis of the air guide grooves (403) and the central axis of the cone of the nozzle (4) is 35-45 degrees, the included angle between the central axis of the air guide grooves (403) and the tangent line of the bottom surface of the cone is 80-88 degrees, and the starting point is coincident with the tangent point.
  6. 6. A hot melt adhesive screw lance as set forth in claim 1, wherein said electric heating rod (105) extends in the axial direction of said air flow heating chamber (101).
  7. 7. The hot melt adhesive spiral spray gun according to claim 1, wherein one side of the gun body (1) is provided with an adhesive outlet (106), the other side is provided with an adhesive inlet (107), the adhesive outlet (106) is communicated with the adhesive inlet (107), and a filter screen (108) is arranged at the joint of the adhesive outlet and the adhesive inlet.
  8. 8. The hot melt adhesive spiral spray gun according to claim 1, wherein the double-cone valve core (5) is arranged in a through hole of the adhesive spraying valve (2) and comprises a small cone-shaped end (501) and a large cone-shaped end (502), the large cone-shaped end (502) is matched with the end face of the cone-shaped adhesive spraying hole (401), the angle range of the small cone-shaped end (501) is 30 degrees to 40 degrees, the angle range of the large cone-shaped end (502) is 70 degrees to 80 degrees, and the small cone-shaped end (501) is used for pushing residual adhesive to be sprayed out in an accelerating manner during adhesive closing.
  9. 9. A hot melt adhesive screw lance as set forth in claim 1 wherein said cavity seal (104) is disposed at the bottom of the air flow heating cavity (101).
  10. 10. The hot melt adhesive spiral spray gun according to claim 1, wherein the valve body of the adhesive spray valve (2) is provided with an adhesive inlet hole (201), the adhesive inlet hole (201) is positioned in the middle of the valve body and is communicated with the adhesive outlet hole (106) of the gun body (1), and the outlet end penetrates through to the adhesive channel hole (301) of the coaxial two-stage screw seat (3).

Description

Hot melt adhesive spiral spray gun Technical Field The utility model belongs to the technical field of spiral spray guns, and particularly relates to a hot melt adhesive spiral spray gun. Background The hot melt adhesive spraying technology is widely applied to the fields of paper products, packaging, sanitary materials and the like, and is characterized in that the hot melt adhesive is sprayed on the surface of a substrate after being heated to a molten state, so that quick adhesion is realized. The traditional spraying equipment mostly adopts a linear spraying mode, but spiral spraying gradually becomes the main stream of the industry due to the advantages of uniform glue wire distribution, large bonding area and the like. However, in practical application, the existing spiral spray gun influences the spiral hot melt adhesive spraying effect due to the difference of the arrangement of the spiral air guide holes, and has poor stability when the spiral hot melt adhesive spraying is smaller than 5mm in width, and has extremely high requirements on the stability of spiral air pressure, hot melt adhesive pressure and hot melt adhesive consistency, the spiral spray is easily interrupted, and the adhesive strength of an object is reduced. Disclosure of utility model The utility model aims to provide a hot melt adhesive spiral spray gun to solve the problems in the prior art. In order to achieve the above purpose, the present utility model provides the following technical solutions: a hot melt adhesive screw spray gun comprising: The gun body is provided with an air flow heating cavity, an air inlet, an air guide hole, a cavity sealing piece and an electric heating rod at the bottom, wherein the electric heating rod is used for heating air flow entering the air flow heating cavity, and the air flow heating cavity is formed by a plurality of curved channels; The glue spraying valve is connected and installed on the gun body through a screw, a through hole is formed in the center of the glue spraying valve, and a coaxial two-stage threaded seat, a nozzle, a biconical valve core and an air guide sleeve are sequentially arranged at the bottom of the glue spraying valve; the top of the coaxial two-stage screw seat is provided with a rubber channel hole and penetrates through the bottom, the lower part of the rectangular surface of the coaxial two-stage screw seat is provided with a small-stage external screw thread and a large-stage external screw thread, one side surface of the coaxial two-stage screw seat is provided with an air inlet hole communicated with the air guide hole, the end surface of the large-stage external screw thread is provided with a plurality of vent holes, and the vent holes are communicated with the air inlet hole and are used for enabling heating air flow to flow into the air guide sleeve in a directional manner; The spray nozzle is fixed on the coaxial two-stage screw seat through small-stage external screw threads, a conical glue spraying hole is formed in the center of the spray nozzle, the periphery of the spray nozzle is provided with a conical surface, the taper range of the conical glue spraying hole is 20-24 degrees, and a plurality of air guide grooves are formed in the conical surface; The air guide sleeve is fixed on the coaxial two-stage screw seat through a large-scale external screw thread, a conical through hole is arranged in the air guide sleeve, and the air guide sleeve is matched with the peripheral conical surface of the nozzle and is formed into a spiral air guide slot hole. Preferably, the lower part of the rectangular surface of the coaxial two-stage screw seat is provided with two-stage external threads, wherein small-stage external threads are matched with the internal threads of the nozzle, and large-stage external threads are matched with the internal threads of the air guide sleeve. Preferably, the port of the conical through hole of the air guide sleeve is jointed with the peripheral conical surface of the nozzle, and the air guide sleeve forms a continuous spiral air guide channel after jointing the port and the peripheral conical surface of the nozzle. Preferably, the air guide hole of the air flow heating cavity is coaxially communicated with the air inlet hole of the coaxial two-stage screw seat. Preferably, the air guide grooves of the nozzle are inclined grooves, the number of the air guide grooves is 4-8, the groove depth is 0.5-1.2mm, the air guide grooves are uniformly distributed on the peripheral conical surface, the included angle between the central axis of the air guide grooves and the central axis of the cone of the nozzle is 35-45 degrees, the included angle between the central axis of the air guide grooves and the tangent line of the bottom surface of the cone is 80-88 degrees, and the starting point is coincident with the tangent line point. Preferably, the electric heating rod extends along the axial direction of the airflow heating cavity. Prefer