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CN-121972346-A - Handheld double-component spray gun capable of automatically purging

CN121972346ACN 121972346 ACN121972346 ACN 121972346ACN-121972346-A

Abstract

The invention relates to the technical field of double-component spray guns, and particularly discloses a hand-held double-component spray gun capable of automatically purging. The air source is simultaneously connected with the reversing air channel and the purging air channel of the air cylinder through the reversing valve, the purging air channel comprises a purging air cavity I arranged outside the mixing chamber and a purging air cavity II arranged outside the material spraying port, the mixing chamber is provided with a feeding port, when the mixing chamber moves to a feeding position, the feeding port is communicated with the material feeding channel, when the mixing chamber moves to a stopping position, the feeding port is communicated with the purging air cavity I, and the reversing valve keeps the purging air channel communicated with the air source in the process of switching the reversing air channel of the air cylinder. According to the invention, through the design of the integrated gas circuit, automatic purging of the interior of the mixing chamber and continuous purging of the material spraying opening are realized when spraying is stopped, the cleaning is efficient, the structure is simplified, the sealing is reliable, the operation is labor-saving, and the device is suitable for spraying construction of high-reactivity bi-component materials such as polyurethane, polyurea and the like.

Inventors

  • ZHANG WEIFENG
  • ZHANG PENG

Assignees

  • 济南京华邦威聚氨酯设备有限公司

Dates

Publication Date
20260505
Application Date
20260326

Claims (9)

  1. 1. The utility model provides a but handheld two-component spray gun of automatic purge, includes rifle body (1), fixes rifle body (10) at rifle body (1) rear end, locates mixing chamber (2) in rifle body (1), sets up at rifle body (10) top drive cylinder (3) that mixing chamber (2) reciprocated, its characterized in that: the air source is connected with the reversing air path and the purging air path of the air cylinder through the reversing valve; The purge gas path includes: The first purging air cavity (4) is arranged outside the mixing chamber (2) and is used for purging the inside of the mixing chamber (2); the second purging air cavity (5) is arranged at the outer side of the material spraying opening (6) and is used for continuously purging the material spraying opening (6); The mixing chamber (2) is provided with a mixing chamber feed inlet (7), when the mixing chamber (2) moves to a feed position, the mixing chamber feed inlet (7) is communicated with a material feed channel (8), and when the mixing chamber (2) moves to a stop position, the mixing chamber feed inlet (7) is communicated with a purging air cavity I (4), and gas enters the mixing chamber (2) for purging; The reversing valve comprises a valve rod mounting cavity (11) arranged in a gun body (10), a reversing valve rod (9) is movably connected in the valve rod mounting cavity (11), a valve rod gas passing channel (901) is arranged in the reversing valve rod (9), the valve rod gas passing channel (901) is connected with a valve rod gas inlet (902) communicated with the rear end of the reversing valve rod (9) and a valve rod front gas outlet (903) and a valve rod rear gas outlet (904) communicated with the side part of the reversing valve rod (9), and the reversing valve rod (9) moves back and forth to control reversing of a cylinder (3) and enable a gas source to be always communicated with a blowing gas path.
  2. 2. The automatic purging handheld bi-component spray gun according to claim 1, wherein the outer diameter of the reversing valve rod (9) is smaller than the inner diameter of the valve rod mounting cavity (11), a first sealing ring (12) is arranged on the front side and the rear side of the valve rod front air outlet (903), a second sealing ring (13) is arranged on the front side of the valve rod rear air outlet (904), the first sealing ring (12) and the second sealing ring (13) are in sliding sealing connection with the valve rod mounting cavity (11), the cylinder reversing air channel comprises a first cylinder air inlet and outlet channel (14) which is positioned in the gun body (10) and is sequentially connected with the valve rod mounting cavity (11) from front to rear, an outer cylinder air outlet channel (16) and a second cylinder air inlet and outlet channel (15), a purging air channel inlet (17) of the purging air channel is connected with the valve rod mounting cavity (11), the purging air inlet (17) is positioned on the rear side of the second cylinder air inlet and outlet channel (15), when the valve rod front air outlet (903) is communicated with the first cylinder air inlet and outlet channel (14), the second cylinder air inlet and outlet channel (15) are communicated with the second cylinder air outlet channel (904), and the purging air inlet (17) and the second cylinder inlet and outlet channel (14) are communicated with the second cylinder inlet and outlet channel (17) are simultaneously, the valve stem front air outlet (903) is blocked.
  3. 3. The automatic purging handheld two-component spray gun according to claim 2, wherein the rear end of the valve rod mounting cavity (11) is connected with an air source, the front end of the valve rod mounting cavity (11) is communicated with the front side, a trigger (18) is arranged in front of the valve rod mounting cavity (11), the trigger (18) is hinged with the gun body (10), the trigger (18) is in an open state and a holding state, the front end of the reversing valve rod (9) is abutted with the trigger (18), when the spraying state is stopped, the reversing valve rod (9) pushes the trigger (18) to the open state under the pressure of the air source in the valve rod mounting cavity (11), and when the trigger (18) is pulled backwards, spraying is started, and the trigger (18) returns to the holding state.
  4. 4. The hand-held bi-component spray gun capable of automatically purging according to claim 2, wherein the purging gas path comprises a purging gas path gun body section (19) positioned on a gun body (10), the first gas inlet and outlet gas channel (14), the second gas inlet and outlet gas channel (16), the second gas inlet and outlet gas channel (15) and the valve rod mounting cavity (11) are all positioned in a first plane, the purging gas path gun body section (19) is positioned above the first plane, a gun body top cavity (1001) penetrating front and back is arranged at the top of the gun body (10), the purging gas path gun body section (19) is a straight hole which is obliquely arranged, the front end of the purging gas path gun body section (19) is connected with the front end of the gun body top cavity (1001), the rear end of the purging gas path gun body section is connected with a purging plug inlet (17) through a vertical hole (20), the outer end of the vertical hole (20) is penetrated outwards, and the outer end of the vertical hole (20) is connected.
  5. 5. The automatic purging handheld two-component spray gun according to claim 1, wherein the rear end of the mixing chamber (2) is of a cylindrical structure, a sealing groove is arranged at a corresponding position in the gun body (1), and a sealing ring (21) is arranged in the groove and used for preventing materials from channeling into the area where the air cylinder (3) is located.
  6. 6. The automatic purging handheld two-component spray gun according to claim 1, wherein a holding part (1002) is arranged at the lower part of the gun body (10), a rear protruding part (1003) is arranged at the rear part, the rear protruding part (1003) is arranged above the holding part (1002), a hanging hole I (22) is arranged at the top of the rear protruding part (1003), a clamping ring (23) is fixedly connected to the bottom end of the holding part (1002), a hanging hole II (2301) is arranged on the clamping ring (23), and an auxiliary belt (24) is connected between the hanging hole I (22) and the hanging hole II (2301).
  7. 7. The automatic purging handheld two-component spray gun of claim 6, wherein the bottom end of the holding part (1002) is connected with a clamping ring (23) through a bolt, a positioning protrusion (2302) for being clamped with the side wall of the holding part (1002) is arranged at the edge of the clamping ring (23), and magic tapes are arranged at the two ends of the auxiliary belt (24).
  8. 8. The automatic purging handheld two-component spray gun according to claim 7, wherein an outer cylinder exhaust passage (16) and a lightening hole (1004) are arranged in the holding part (1002), the upper end of the lightening hole (1004) is connected with the outer cylinder exhaust passage (16), and the lower end of the lightening hole is communicated downwards.
  9. 9. The automatic purging handheld two-component spray gun of claim 7, wherein the front end of the mixing chamber (2) is fixedly connected with a blowing cap (25), a blowing cap mounting hole (2502) which is communicated with the mixing chamber (2) front and back is formed in the blowing cap (25), the outer end and the inner end of the blowing cap (25) are in sliding sealing connection with the gun body (1), a purging air cavity II (5) is formed by a cavity enclosed between the blowing cap (25) and the gun body (1), and a blowing hole (2501) for blowing air to a front end material spraying opening (6) of the mixing chamber (2) is formed in the blowing cap (25).

Description

Handheld double-component spray gun capable of automatically purging Technical Field The invention relates to the technical field of bi-component spray guns, in particular to a hand-held bi-component spray gun capable of automatically blowing, which is mainly used for spraying construction of high-reactivity bi-component materials such as polyurethane, polyurea and the like. Background The high polymer materials such as polyurethane, polyurea and the like are widely applied in the fields of water resistance, corrosion resistance, wear resistance and the like due to the excellent physical properties and corrosion resistance. The performance of the bi-component spray gun serving as core equipment for the construction of the material directly influences the spraying quality and the construction efficiency. The existing double-component spray gun generally adopts a pneumatic control mode, and a valve rod or a mixing chamber is driven to move through an air cylinder, so that the on-off of material feeding and the start and stop of spraying are realized. For example, the patent with the publication number CN203264930U discloses a manual and pneumatic dual-purpose dual-component spray gun, which adopts a cylinder to drive a valve rod to move back and forth to control the opening and closing of a feed inlet of a mixing chamber, but the spray gun is not provided with a purging device, so that the interior of the mixing chamber and the feed inlet cannot be effectively cleaned, and material residues and blockage are easily caused. The patent with the publication number of CN223337630U discloses a polyurethane spray gun, which adopts a cylinder to drive a mixing chamber to move back and forth to realize the start and stop of spraying, and is respectively connected with a liquid inlet pipe and an air inlet pipe through independent cleaning fluid pipes to realize the two-step cleaning of cleaning and drying the mixing chamber. However, the cleaning mode needs to independently control a plurality of valves, is complex to operate, is not suitable for a handheld spray gun with a simplified structure, and is not provided with a continuous purging structure for a material spraying port, so that the risk of material residue at the material spraying port still exists. In addition, the existing spray gun is not provided with an effective sealing structure between the mixing chamber and the gun body, materials flow to the area where the air cylinder is located easily after being blown out, and the reliability and the service life of equipment are affected. In view of the above, the existing dual-component spray gun still has shortcomings in terms of cleaning mechanism, gas circuit integration level, sealing reliability and the like, and a hand-held dual-component spray gun which is clean and efficient, has a simple structure and is reliable in sealing is needed. Disclosure of Invention The invention mainly aims to provide a hand-held double-component spray gun capable of automatically purging, so as to solve the problem of how to provide a double-component spray gun which is clean, efficient, good in sealing performance and simple in structure in the prior art. In order to solve the problems in the prior art, the invention provides a hand-held bi-component spray gun capable of automatically purging, which adopts the following technical scheme: The hand-held bi-component spray gun comprises a gun body, a mixing chamber, an air cylinder and an air source, wherein the gun body is fixed at the rear end of the gun body, the mixing chamber is arranged in the gun body, the air cylinder is arranged at the top of the gun body and drives the mixing chamber to move forwards and backwards, and the air source is simultaneously connected with an air cylinder reversing air path and a blowing air path through reversing valves; The purge gas path includes: the first purging air cavity is arranged outside the mixing chamber and is used for purging the inside of the mixing chamber; The purging air cavity II is arranged at the outer side of the material spraying opening and is used for purging the material spraying opening; The mixing chamber is provided with a mixing chamber feed inlet, and when the mixing chamber moves to a feed position, the mixing chamber feed inlet is communicated with the material feed channel; the reversing valve comprises a valve rod mounting cavity arranged in the gun body, a reversing valve rod is movably connected in the valve rod mounting cavity, a valve rod gas passing channel is arranged in the reversing valve rod, a valve rod gas inlet penetrating through the rear end of the reversing valve rod, a valve rod front gas outlet penetrating through the side part of the reversing valve rod and a valve rod rear gas outlet are connected to the valve rod gas passing channel, the reversing valve rod moves back and forth, the reversing valve rod can control the reversing of the air cylinder, and the air source is always communic