CN216078459U - Adhesive spraying equipment and pneumatic backflow valve - Google Patents

Abstract

The utility model relates to the technical field of hot melt adhesive spraying, and discloses adhesive spraying equipment and a pneumatic backflow valve. The adhesive spraying equipment with the pneumatic backflow valve also has the advantages.

Description

Adhesive spraying equipment and pneumatic backflow valve

Technical Field

The utility model relates to the technical field of adhesive spraying, in particular to adhesive spraying equipment and a pneumatic backflow valve.

Background

In the adhesive spraying equipment, the adhesive liquid is conveyed through an adhesive conveying system, and a return valve is usually arranged in the conveying system to prevent the system from being damaged due to overhigh pressure. At present, the relative position between adjusting stud and the valve body is adjusted through the reflux valve to adjust pressure spring's tightness, thereby realize different switching pressure's regulation, in order to adapt to different user demands, this regulation mode troublesome poeration, and be difficult to the accuse adjustment accuracy.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the pneumatic reflux valve is convenient to operate and has good flexible adaptability.

The utility model also provides adhesive spraying equipment with the pneumatic backflow valve.

An embodiment of the first aspect of the present invention provides a pneumatic reflux valve, including:

the valve body is provided with an inner cavity, one end of the valve body is provided with a liquid inlet communicated with the inner cavity, a valve port is arranged in the position, away from the liquid inlet, of the inner cavity of the valve body at a set distance, a backflow hole communicated with the inner cavity is further formed in the side wall of the valve body, the backflow hole penetrates through the inner wall of the valve body and corresponds to the position, away from the liquid inlet, of the valve port, and an air inlet interface communicated with the inner cavity is formed in the other end of the valve body;

the air inlet joint is hermetically connected with the air inlet interface, the interior of the air inlet joint is hollow to form an air inlet channel, and the air inlet channel is communicated with the inner cavity;

the pressure stabilizing shaft is arranged in the inner cavity, one end of the pressure stabilizing shaft, facing the liquid inlet, can be abutted against and plugged in the valve port, a sealing port is further arranged on one side, away from the valve port, of the valve body, corresponding to the backflow hole, the pressure stabilizing shaft is in sealing connection with the sealing port, and a gap through which fluid can flow is formed between the position, corresponding to the backflow hole, of the pressure stabilizing shaft and the inner wall of the valve body;

the piston ring is arranged in the inner cavity and is positioned between the pressure stabilizing shaft and the air inlet interface, the piston ring is connected to the inner wall of the valve body in a sealing mode, the piston ring can slide relative to the valve body through the action of air pressure in the air inlet channel to be close to or far away from the valve port, the inner wall of the valve body is provided with a limiting part, and the piston ring can abut against the limiting part;

the constant pressure spring is abutted between the piston ring and the pressure stabilizing shaft and has elastic force which enables the pressure stabilizing shaft to abut against the valve port and enables the piston ring to abut against the limiting part.

The pneumatic reflux valve provided by the embodiment of the utility model at least has the following beneficial effects: when the acting force of the liquid at the liquid inlet to the pressure stabilizing shaft is greater than the sum of the acting force of the gas pressure in the gas inlet channel and the acting force of the elastic force of the constant-pressure spring to the pressure stabilizing shaft, the liquid can push the pressure stabilizing shaft to open the valve port, liquid backflow is realized, the constant pressure of the adhesive conveying system is kept, the air pressure of the gas introduced into the gas inlet channel is changed, the opening and closing pressure of the valve port can be changed, and therefore the pressure regulating device is suitable for different use requirements, flexible and convenient in regulating mode and easy to regulate the precision.

According to the pneumatic backflow valve of some embodiments of the present invention, the valve body comprises a valve body seat and a valve upper cover, the valve body seat is hollow inside to form a first cavity, the valve body seat has two opposite ends, the first cavity penetrates through the two ends of the valve body seat, the liquid inlet is formed at one end, a mounting hole is formed at the other end, a first raised shoulder is arranged on the inner wall of the valve body seat corresponding to the proximal end of the liquid inlet to form the valve port, a second raised shoulder is arranged on the inner wall of the valve body seat corresponding to the set distance from the side, away from the liquid inlet, of the first shoulder to form the sealing port, and the backflow hole penetrates through the inner wall between the valve port of the valve body seat and the sealing port; the valve upper cover is provided with two opposite ends, a second cavity is formed in the valve upper cover in a hollow mode and penetrates through the two ends of the valve upper cover, one end of the valve upper cover is connected to the mounting hole in a sealing mode, one end of the valve upper cover is connected to the mounting hole, the second cavity is communicated with the first cavity, and the other end of the valve upper cover penetrates through the second cavity to form the air inlet interface.

According to some embodiments of the utility model, the pneumatic backflow valve further comprises a guide sleeve ring, the guide sleeve ring is arranged in the first cavity, the guide sleeve ring is connected to the inner wall of the first cavity in a sealing mode, the guide sleeve is provided with a central hole which is coaxial with the valve port, and the pressure stabilizing shaft is arranged in the central hole in a penetrating mode in a sliding mode.

According to the pneumatic backflow valve, the piston ring is connected with the inner wall of the valve body seat in a sealing mode and can slide relative to the valve body seat to be close to or far away from the valve upper cover, and the valve upper cover is provided with the limiting portion.

According to the pneumatic backflow valve, the piston ring is internally provided with a blind hole, the blind hole is opened towards the valve port, and a part of the constant pressure spring is located in the blind hole and abuts against one end, far away from the valve port, of the blind hole.

According to the pneumatic backflow valve, the outer wall of the piston ring is provided with a first annular groove, a first sealing ring is sleeved in the first annular groove, and the first sealing ring is pressed between the piston ring and the inner wall of the valve body seat.

According to the pneumatic reflux valve disclosed by the embodiment of the utility model, the outer wall of the piston ring is provided with a mounting groove, a leather cup is sleeved on the mounting groove, the leather cup comprises a connecting part and a lip, the connecting part is positioned in the mounting groove, the lip is turned over towards one side of the air inlet interface, a gap is formed between the inner wall of the lip and the outer wall of the piston ring, and the outer wall of the lip is attached to the inner wall of the valve body seat.

According to the pneumatic backflow valve provided by the embodiments of the utility model, the pressure stabilizing shaft is sleeved with the sealing shaft seal, and the outer wall of the sealing shaft seal abuts against the inner wall of the valve body.

According to the pneumatic backflow valve provided by some embodiments of the utility model, the outer wall of the valve body, which corresponds to the proximal end of the liquid inlet, is provided with a second annular groove, the second annular groove is located between the liquid inlet and the backflow hole, the second annular groove is provided with a gasket and a second sealing ring, and the gasket is located on one side, away from the liquid inlet, of the second sealing ring.

The embodiment of the second aspect of the utility model further provides adhesive spraying equipment, which comprises a manifold seat and the pneumatic backflow valve of the embodiment of the first aspect, wherein a liquid channel, a valve body mounting hole and a backflow channel are arranged in the manifold seat, the valve body mounting hole is communicated with the liquid channel, the backflow channel is communicated with the valve body mounting hole, one end, provided with the liquid inlet, of the valve body of the pneumatic backflow valve is hermetically connected to the inner wall of the valve body mounting hole, the liquid inlet is communicated with the liquid channel, the backflow hole is communicated with the backflow channel, liquid in the liquid channel can push the pressure stabilizing shaft to move so as to open the valve port, and the liquid channel is communicated with the backflow channel through the opened valve port and the backflow hole.

The adhesive spraying equipment provided by the embodiment of the utility model at least has the following beneficial effects: when the acting force of the liquid channel in the branching seat on the pressure stabilizing shaft is greater than the sum of the acting force of the gas pressure in the gas inlet channel and the acting force of the elastic force of the constant pressure spring on the pressure stabilizing shaft, the liquid can push the pressure stabilizing shaft to open the valve port, so that the liquid backflow is realized, the adhesive conveying system is facilitated to maintain constant pressure, the stability of output adhesive pressure is ensured, and the spraying quality is ensured. In addition, the adhesive spraying equipment can change the opening and closing pressure of the valve port by changing the air pressure of the air introduced into the air inlet channel, so that the adhesive spraying equipment is suitable for different use requirements, flexible and convenient in adjustment mode, and easy to control and adjust the precision.

Additional aspects and advantages of the utility model 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 utility model.

Drawings

FIG. 1 is a schematic view of a pneumatic reflux valve according to one embodiment of the present invention;

FIG. 2 is an exploded schematic view of the pneumatic reflux valve of FIG. 1;

FIG. 3 is a cross-sectional view A-A of FIG. 1;

FIG. 4 is a schematic view of another state of FIG. 3;

FIG. 5 is a schematic view of the valve body seat of FIG. 3;

FIG. 6 is a schematic view of the valve cover of FIG. 3;

FIG. 7 is a schematic view of the guide collar of FIG. 3;

FIG. 8 is a schematic view of the piston ring of FIG. 3;

FIG. 9 is a schematic view of another embodiment of a piston ring;

FIG. 10 is a schematic view of the surge shaft and seal shaft seal of FIG. 3;

fig. 11 is a schematic view of a part of a glue spraying apparatus according to an embodiment of the present invention.

Reference numerals:

an intake joint 100, an intake passage 110;

the valve comprises an upper valve cover 200, a second cavity 210, an air inlet interface 220, a limiting part 230 and a sealing structure 240;

the valve body seat 300, the first cavity 310, the liquid inlet 320, the valve port 330, the backflow hole 340, the mounting hole 350, the first shoulder 360, the second shoulder 370, the sealing port 380, the second annular groove 390, the gasket 391, the second sealing ring 392 and the external thread 301;

a pressure stabilizing shaft 400, a seal shaft seal 410, an opening 411;

the piston ring 500, the blind hole 510, the first annular groove 520, the first sealing ring 530, the mounting groove 540, the leather cup 550 and the lip 551;

a constant pressure spring 600, a guide collar 700, a center hole 710;

a manifold seat 800, a liquid channel 810, a valve body mounting hole 820, a backflow channel 830 and a third sealing ring 840.

Detailed Description

The concept and technical effects of the present invention will be clearly and completely described below in conjunction with the embodiments to fully understand the objects, features and effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention.

In the description of the embodiments of the present invention, if an orientation description is referred to, for example, the orientations or positional relationships indicated by "upper", "lower", "front", "rear", "left", "right", etc. are based on the orientations or positional relationships shown in the drawings, only for convenience of describing the present invention and simplifying the description, but not for indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

In the description of the embodiments of the present invention, if a feature is referred to as being "disposed", "fixed", "connected", or "mounted" to another feature, it may be directly disposed, fixed, or connected to the other feature or may be indirectly disposed, fixed, connected, or mounted to the other feature. In the description of the embodiments of the present invention, if "a number" is referred to, it means one or more, if "a plurality" is referred to, it means two or more, if "greater than", "less than" or "more than" is referred to, it is understood that the number is not included, and if "greater than", "lower" or "inner" is referred to, it is understood that the number is included. If reference is made to "first" or "second", this should be understood to distinguish between features and not to indicate or imply relative importance or to implicitly indicate the number of indicated features or to implicitly indicate the precedence of the indicated features.

Among the present viscose agent spraying equipment, the tight degree of pressure spring is adjusted through adjusting the relative position between adjusting stud and the valve body to the backward flow valve to realize different switching pressure's regulation, in order to adapt to different user demands, but this regulation mode troublesome poeration, need artifical manual regulation, and be difficult to control the adjustment precision. The embodiment of the utility model provides a pneumatic backward flow valve and have this pneumatic backward flow valve's viscose agent spraying equipment can realize online regulation through the switching pressure of the regulation valve port of atmospheric pressure that admits air, and the regulative mode is convenient and reliable, and the precision is easily to the accuse.

Fig. 1 is a schematic view of a pneumatic reflux valve according to an embodiment of the present invention, fig. 2 is an exploded schematic view of the pneumatic reflux valve of fig. 1, fig. 3 is a sectional view a-a of fig. 1, fig. 4 is a schematic view of another state of fig. 3, and referring to fig. 1 to 4, the pneumatic reflux valve according to an embodiment of a first aspect of the present invention includes a valve body, an intake joint 100, a surge shaft 400, a piston ring 500, and a constant pressure spring 600, wherein:

the valve body is provided with an inner cavity, one end of the valve body is provided with a liquid inlet 320 communicated with the inner cavity, a valve port 330 is arranged in the position, away from the liquid inlet 320, of the inner cavity of the valve body at a set distance, a backflow hole 340 communicated with the inner cavity is further arranged on the side wall of the valve body, and the backflow hole 340 penetrates through the inner wall of the valve body and corresponds to the position, away from the liquid inlet 320, of the valve port 330. The other end of the valve body is provided with an air inlet interface 220 communicated with the inner cavity, the air inlet connector 100 is connected to the air inlet interface 220 in a sealing mode, the interior of the air inlet connector is hollow to form an air inlet passage 110, the air inlet passage 110 is communicated with the inner cavity, and the air inlet passage 110 is used for introducing high-pressure air.

The pressure stabilizing shaft 400 is arranged in the inner cavity, one end of the pressure stabilizing shaft 400 facing the liquid inlet 320 can be abutted and blocked on the valve port 330, one side of the valve body corresponding to the backflow hole 340 and departing from the valve port 330 is also provided with a sealing port 380, the pressure stabilizing shaft 400 is hermetically connected with the sealing port 380, and a gap through which fluid can flow is formed between the position of the pressure stabilizing shaft 400 corresponding to the backflow hole 340 and the inner wall of the valve body.

The piston ring 500 is disposed in the inner cavity and located between the pressure stabilizing shaft 400 and the air inlet interface 220, the piston ring 500 is connected to the inner wall of the valve body in a sealing manner, and the piston ring 500 can slide relative to the valve body to be close to or far away from the valve port 330 under the action of the air pressure in the air inlet passage 110, the inner wall of the valve body has a limiting portion 230, and the piston ring 500 can abut against the limiting portion 230. The constant pressure spring 600 is pressed between the piston ring 500 and the pressure stabilizing shaft 400, and the constant pressure spring 600 has an elastic force for pressing the pressure stabilizing shaft 400 against the valve port 330 and for pressing the piston ring 500 against the stopper 230.

Referring to fig. 3, when the liquid pressure at the inlet 320 is lower than the set value, the pressure stabilizing shaft 400 can keep closing the valve port 330 under the action of the air pressure of the air inlet passage 110 and the elastic force of the constant pressure spring 600, and the inlet 320 and the return hole 340 are isolated from each other; referring to fig. 4, when the liquid pressure at the inlet 320 is greater than the set value, when the valve port 330 is opened, the backflow hole 340 is communicated with the inlet 320, the liquid can enter the valve port 330 through the inlet 320 and flow out from the backflow hole 340, and the backflow hole 340 is used for being communicated with the backflow channel 830 to realize backflow of the liquid. Therefore, the valve port 330 is opened and closed by the movement of the pressure stabilizing shaft 400, when the acting force of the liquid at the liquid inlet 320 on the pressure stabilizing shaft 400 is greater than the sum of the gas pressure in the air inlet channel 110 and the acting force of the elastic force of the constant pressure spring 600 on the pressure stabilizing shaft 400, the liquid can push the pressure stabilizing shaft 400 to open the valve port 330, so that liquid backflow is realized, the constant pressure of the adhesive conveying system is kept, the air pressure of the gas introduced into the air inlet channel 110 is changed, the upper limit of the hydraulic pressure required by opening the valve port 330 in the liquid channel 810 can be changed, different use requirements are met, the adjusting mode is flexible and convenient, and the accuracy of control and adjustment is easy.

Fig. 5 is a schematic view of the valve body seat 300 of fig. 3, and fig. 6 is a schematic view of the valve upper cover 200 of fig. 3. referring to fig. 2-6, in some embodiments, the valve body comprises the valve body seat 300 and the valve upper cover 200, which are sealingly connected to form a split valve body, which can facilitate processing and assembly of internal structural components. Referring to fig. 5, the valve body base 300 is hollow to form a first cavity 310, the valve body base 300 has two opposite ends, the first cavity 310 penetrates the two ends of the valve body base 300, and forms a liquid inlet 320 at one end and a mounting hole 350 at the other end. The inner wall of the valve body seat 300 is provided with a first raised shoulder 360 corresponding to the proximal end of the inlet port 320 to form the valve port 330, and a second raised shoulder 370 corresponding to the set distance from the side of the first shoulder 360 facing away from the inlet port 320 is provided on the inner wall of the valve body seat 300 to form a sealing port 380. The return hole 340 penetrates an inner wall between the valve port 330 of the valve body seat 300 and the seal port 380.

Referring to fig. 6, the valve upper cover 200 has opposite ends, one end of the valve upper cover 200 is sealingly coupled to the mounting hole 350, and a sealing structure 240 (e.g., a packing) is provided between an outer wall of the valve upper cover 200 and an inner wall of the mounting hole 350. The interior of the upper valve cover 200 is hollow to form a second cavity 210, the second cavity 210 penetrates through two ends of the upper valve cover 200, one end of the second cavity 210, connected with the mounting hole 350, of the upper valve cover 200 is communicated with the first cavity 310, the second cavity 210 and the first cavity 310 jointly form an inner cavity of the valve body, the second cavity 210 penetrates through the other end of the upper valve cover 200 to form an air inlet interface 220, and the air inlet connector 100 is connected to the air inlet interface 220, so that air can be introduced into the second cavity 210.

Fig. 7 is a schematic view of the guide collar 700 of fig. 3, and in some embodiments, the pneumatic backflow valve further includes a guide collar 700, the guide collar 700 is disposed in the first cavity 310, the guide collar 700 is hermetically connected to an inner wall of the first cavity 310, the guide collar 700 has a central hole 710 coaxial with the valve port 330, and an outer peripheral wall of the guide collar 700 is coaxial with the central hole 710. The pressure stabilizing shaft 400 is slidably disposed through the central hole 710, so that the pressure stabilizing shaft 400 can be coaxial with the valve port 330, which helps to ensure the effectiveness of closing the valve port 330, and the guide collar 700 is used to guide the pressure stabilizing shaft 400, thereby effectively avoiding the problem that the valve port 330 is not closed tightly due to the deflection of the pressure stabilizing shaft 400.

Fig. 8 is a schematic view of the piston ring 500 in fig. 3, and fig. 9 is a schematic view of another embodiment of the piston ring 500, and referring to fig. 2, 3 and 8, in some embodiments of the pneumatic backflow valve, the piston ring 500 is in sealing connection with an inner wall of the valve body seat 300 and can slide relative to the valve body seat 300 to approach or separate from the valve upper cover 200, the valve upper cover 200 is provided with a limiting portion 230, and the piston ring 500 can abut against the limiting portion 230. In some embodiments, the piston ring 500 has a blind hole 510 therein, the opening 411 of the blind hole 510 faces the valve port 330, and a portion of the constant pressure spring 600 is disposed in the blind hole 510 and abuts against an end of the blind hole 510 away from the valve port 330. Thereby, the air pressure at the intake passage 110 can push the piston ring 500 and press the constant pressure spring 600, thereby supporting the stabilizer shaft 400. The constant pressure spring 600 may be coaxially disposed in the blind hole 510, and the hole wall of the blind hole 510 may serve to accommodate and guide the constant pressure spring 600, thereby helping to ensure the stability of the elastic force of the constant pressure spring 600. The constant pressure spring 600 is coaxially disposed with the stabilizer shaft 400, and thus, it is prevented that the constant pressure spring 600 deflects the axial force of the stabilizer shaft 400 to affect the movement of the stabilizer shaft 400.

Referring to fig. 8, in the pneumatic backflow valve of some embodiments, the outer wall of the piston ring 500 is provided with a first annular groove 520, a first sealing ring 530 is sleeved in the first annular groove 520, and the first sealing ring 530 is compressed between the piston ring 500 and the inner wall of the valve body seat 300, thereby achieving better air tightness. The first sealing ring 530 can be an O-shaped ring to form linear sealing, so that the flatness requirement of a sealing surface can be reduced, and the sealing effectiveness is improved. Referring to fig. 9, in other embodiments of the pneumatic reflux valve, an outer wall of the piston ring 500 is provided with a mounting groove 540, a cup 550 is sleeved on the mounting groove 540, the cup 550 includes a connecting portion and a lip 551, the connecting portion is located in the mounting groove 540, the lip 551 is folded towards one side of the air inlet port 220, a gap is formed between an inner wall of the lip 551 and an outer wall of the piston ring 500, and an outer wall of the lip 551 is attached to an inner wall of the valve body seat 300. The cup 550 is used for sealing a moving part, has good sealing performance and also has certain force transmission capacity, for example, when the piston ring 500 moves in a direction away from the valve port 330, the gas in the second cavity 210 is squeezed to act on the cup 550 in a reverse direction, and can have a certain reverse thrust effect on the piston ring 500, so that the motion stability of the piston ring 500 is maintained.

Fig. 10 is a schematic view of the surge shaft 400 shown in fig. 3, and referring to fig. 3 and 10, in some embodiments of the pneumatic backflow valve, a sealing shaft seal 410 is sleeved on the surge shaft 400, and an outer wall of the sealing shaft seal 410 abuts against an inner wall of the valve body to achieve a sealing connection between the surge shaft 400 and the valve body. The sealing shaft seal 410 is a conventional sealing member, and the side having the opening 411 faces the direction of the valve port 330, so as to effectively block the liquid entering from the liquid inlet 320.

Referring to fig. 1 to 3, in the pneumatic reflux valve of the above embodiment, the outer wall of the valve body corresponding to the proximal end of the liquid inlet port 320 may further be provided with a second annular groove 390, the second annular groove 390 is located between the liquid inlet port 320 and the reflux hole 340, the second annular groove 390 is provided with a gasket 391 and a second sealing ring 392, and the second sealing ring 392 may be an O-ring to form a line seal. The gasket 391 is located on a side of the second sealing ring 392, which is away from the liquid inlet port 320, and may be used for installation and limiting of the valve body, for example, installation with the manifold base 800, and the gasket 391 may also be used for abutting against the second sealing ring 392, thereby ensuring the sealing performance of the second sealing ring 392.

Fig. 11 is a schematic view of a part of a glue spraying apparatus according to an embodiment of the present invention, in which arrows indicate the flow direction of liquid. With reference to fig. 11, in combination with the foregoing, an adhesive spraying apparatus according to an embodiment of the second aspect of the present invention includes a branching seat 800 and the pneumatic backflow valve according to the embodiment of the first aspect, and further includes a glue gun for spraying an adhesive. The branching seat 800 is used for branching and filtering in the glue solution conveying system. The manifold base 800 is provided therein with a liquid passage 810, a valve body mounting hole 820, and a return passage 830. The valve body is connected to the valve body mounting hole 820 and may be screwed, for example, the outer wall of the valve body seat 300 is provided with an external thread 301, and an internal thread adapted to be screwed with the external thread 301 is provided in the valve body mounting hole 820, thereby achieving a screw connection therebetween. A third sealing ring 840 is further arranged between the valve body seat 300 and the valve body mounting hole 820, so that the valve body mounting hole 820 is sealed. During spraying, high pressure fluid pumped by the pump action is delivered through the fluid passage 810 into the manifold block 800. The valve body mounting hole 820 is communicated with the liquid channel 810, the backflow channel 830 is communicated with the valve body mounting hole 820, one end of the valve body of the pneumatic backflow valve, which is provided with the liquid inlet 320, is hermetically connected to the inner wall of the valve body mounting hole 820, the liquid inlet 320 is communicated with the liquid channel 810, the backflow hole 340 is communicated with the backflow channel 830, liquid in the liquid channel 810 can push the pressure stabilizing shaft 400 to move so as to open the valve port 330, the liquid channel 810 is communicated with the backflow channel 830 through the opened valve port 330 and the backflow hole 340, therefore, the backflow channel 830 can backflow the liquid into the glue solution melting cylinder, after the liquid enters the branching seat 800, the liquid firstly passes through the pneumatic backflow valve, then partial backflow is realized to cause the melting cylinder, the excessive flow enters the filtering device and then is branched, and the system can be prevented from being damaged due to overhigh pressure through backflow of the liquid.

From the above, when the acting force of the liquid in the liquid channel 810 in the branch seat 800 on the pressure stabilizing shaft 400 is greater than the sum of the acting force of the gas pressure in the gas inlet channel 110 and the elastic force of the constant pressure spring 600 on the pressure stabilizing shaft 400, after the liquid enters the branch seat 800, the liquid first passes through the pneumatic reflux valve, part of the liquid enters the valve body through the liquid inlet 320 of the starting reflux valve and pushes the pressure stabilizing shaft 400 to open the valve port 330 under the action of pressure difference, and part of the liquid realizes liquid reflux through the reflux hole 340, which is helpful for the adhesive delivery system to maintain constant pressure, thereby ensuring the stability of output adhesive pressure and ensuring the spraying quality. In addition, according to the adhesive spraying equipment disclosed by the utility model, the upper limit of hydraulic pressure required for opening the valve opening 330 in the liquid channel 810 can be changed by changing the air pressure of the gas introduced into the gas inlet channel 110, so that different use requirements are met, the adjusting mode is flexible and convenient, the accuracy is easily adjusted, the stability and the accuracy of the adhesive pressure of the adhesive cavity are ensured, and the spraying quality is ensured.

The adhesive spraying equipment provided by the embodiment of the utility model can be used for polyamine hot melt adhesive, can be applied to adhesive spraying of various products, such as carton handle bonding, carton, paper cup, hygienic product and straw bonding, and the like, and can adjust the pressure of the air inlet interface on line by configuring the PLC, so that different opening and closing pressure requirements are met.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention. Furthermore, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.

Claims (10)

1. A pneumatic reflux valve, comprising:

the valve body is provided with an inner cavity, one end of the valve body is provided with a liquid inlet communicated with the inner cavity, a valve port is arranged in the position, away from the liquid inlet, of the inner cavity of the valve body at a set distance, a backflow hole communicated with the inner cavity is further formed in the side wall of the valve body, the backflow hole penetrates through the inner wall of the valve body and corresponds to the position, away from the liquid inlet, of the valve port, and an air inlet interface communicated with the inner cavity is formed in the other end of the valve body;

the air inlet joint is hermetically connected with the air inlet interface, the interior of the air inlet joint is hollow to form an air inlet channel, and the air inlet channel is communicated with the inner cavity;

the pressure stabilizing shaft is arranged in the inner cavity, one end of the pressure stabilizing shaft, facing the liquid inlet, can be abutted against and plugged in the valve port, a sealing port is further arranged on one side, away from the valve port, of the valve body, corresponding to the backflow hole, the pressure stabilizing shaft is in sealing connection with the sealing port, and a gap through which fluid can flow is formed between the position, corresponding to the backflow hole, of the pressure stabilizing shaft and the inner wall of the valve body;

the piston ring is arranged in the inner cavity and is positioned between the pressure stabilizing shaft and the air inlet interface, the piston ring is connected to the inner wall of the valve body in a sealing mode, the piston ring can slide relative to the valve body through the action of air pressure in the air inlet channel to be close to or far away from the valve port, the inner wall of the valve body is provided with a limiting part, and the piston ring can abut against the limiting part;

the constant pressure spring is abutted between the piston ring and the pressure stabilizing shaft and has elastic force which enables the pressure stabilizing shaft to abut against the valve port and enables the piston ring to abut against the limiting part.

2. The pneumatic reflux valve as claimed in claim 1, wherein the valve body comprises a valve body seat and an upper valve cover, the valve body seat is hollow inside to form a first cavity, the valve body seat has two opposite ends, the first cavity penetrates through the two ends of the valve body seat and forms the liquid inlet at one end and a mounting hole at the other end, a raised first shoulder is arranged on the inner wall of the valve body seat corresponding to the proximal end of the liquid inlet to form the valve port, a raised second shoulder is arranged on the inner wall of the valve body seat corresponding to the side of the first shoulder away from the liquid inlet at a set distance to form the sealing port, and the reflux hole penetrates through the inner wall of the valve body seat between the valve port and the sealing port; the valve upper cover is provided with two opposite ends, a second cavity is formed in the valve upper cover in a hollow mode and penetrates through the two ends of the valve upper cover, one end of the valve upper cover is connected to the mounting hole in a sealing mode, one end of the valve upper cover is connected to the mounting hole, the second cavity is communicated with the first cavity, and the other end of the valve upper cover penetrates through the second cavity to form the air inlet interface.

3. The pneumatic reflux valve as set forth in claim 2, further including a guide collar disposed within said first cavity, said guide collar sealingly connected to an inner wall of said first cavity, said guide collar having a central bore coaxial with said valve port, said surge shaft slidably disposed through said central bore.

4. The pneumatic reflux valve as set forth in claim 2, wherein said piston ring is sealingly connected to an inner wall of said valve body seat and is slidable relative to said valve body seat to approach or separate from said valve upper cover, said valve upper cover being provided with said stopper portion.

5. The pneumatic reflux valve as set forth in claim 4, wherein said piston ring has a blind bore therein, said blind bore opening toward said valve port, a portion of said constant pressure spring being disposed in said blind bore and abutting an end of said blind bore remote from said valve port.

6. The pneumatic reflux valve as set forth in claim 5, wherein said piston ring has an outer wall provided with a first annular groove, and a first seal ring is fitted in said first annular groove and compressed between said piston ring and an inner wall of said valve body seat.

7. The pneumatic reflux valve as claimed in claim 5, wherein the outer wall of the piston ring is provided with a mounting groove, a leather cup is sleeved on the mounting groove, the leather cup comprises a connecting portion and a lip, the connecting portion is located in the mounting groove, the lip is folded towards one side of the air inlet port, a gap is formed between the inner wall of the lip and the outer wall of the piston ring, and the outer wall of the lip is attached to the inner wall of the valve body seat.

8. The pneumatic reflux valve as set forth in claim 1, wherein said pressure stabilizing shaft is sleeved with a sealing shaft seal, and an outer wall of said sealing shaft seal abuts against an inner wall of said valve body.

9. The pneumatic reflux valve as claimed in any one of claims 1 to 8, wherein a second annular groove is provided in an outer wall of the valve body corresponding to a proximal end of the liquid inlet, the second annular groove being located between the liquid inlet and the reflux hole, a gasket and a second sealing ring being provided in the second annular groove, the gasket being located on a side of the second sealing ring facing away from the liquid inlet.

10. An adhesive spraying apparatus, comprising: the pneumatic reflux valve as claimed in any one of claims 1 to 9, wherein a liquid channel, a valve body mounting hole and a reflux channel are arranged in the manifold seat, the valve body mounting hole is communicated with the liquid channel, the reflux channel is communicated with the valve body mounting hole, one end of the valve body of the pneumatic reflux valve, which is provided with the liquid inlet, is hermetically connected to the inner wall of the valve body mounting hole, the liquid inlet is communicated with the liquid channel, the reflux hole is communicated with the reflux channel, the liquid in the liquid channel can push the pressure stabilizing shaft to move so as to open the valve port, and the liquid channel is communicated with the reflux channel through the opened valve port and the reflux hole.

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