Dispensing valve

Abstract

The utility model provides a dispensing valve which comprises an upper valve body, a lower valve body, a dispensing nozzle and a dispensing nozzle outer cover. According to the utility model, a two-stage valve closing structural form is adopted, when dispensing is finished, the glue sealing head in the first stage is firstly closed, and the glue sealing head adopts a reverse valve closing form, so that when the valve is closed, the space of the first back-suction cavity is enlarged, the pressure in the first back-suction cavity is reduced, and an instantaneous back-suction phenomenon is formed; after residual glue in a glue outlet hole, a second material cavity I and a second material cavity II in the second stage is sucked back to a back suction channel and a first back suction cavity, a needle valve in the second stage is closed again, at the moment, no residual glue exists in the glue outlet hole, the second material cavity I and the second material cavity II, no residual glue is naturally extruded out when a valve needle is closed, the problems of glue hanging, glue dripping, large glue lumps and the like are prevented, and the service life of the glue pump is prolonged. When the valve needle in the second stage is closed, air enters the air inlet channel and is blown out from the air blowing opening after passing through the air blowing cavity, and the problem of wire drawing is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of glue dispensing, in particular to a glue dispensing valve. Background Art

[0002] In the molding process of lithium soft-pack batteries, hot melt glue needs to be evenly applied to the aluminum film on both sides of the plastic-sealed battery cell, and then the edges need to be flanging. The main problems with the current dispensing valves on the market are as follows: 1. Due to the high viscosity of the hot melt glue, there is a wire drawing phenomenon at the end of the dispensing; 2. When the dispensing valve is closed, the residual glue in the glue cavity will be squeezed out when the valve needle is closed, resulting in a large lump of glue at the end of the dispensing; or there will be glue hanging after the valve is closed, resulting in a large lump of glue when the glue is removed. In view of the common problems of wire drawing and large clumps of glue in the dispensing valves in the industry, it is urgent to develop a new type of hot melt glue dispensing valve that can solve the above problems. Utility Model Content

[0003] The utility model provides a glue dispensing valve, which solves the defects of glue dispensing valves used for hot melt glue in the prior art, that is, wire drawing and large clumps of glue exist at the end of glue dispensing.

[0004] The technical solution of the utility model is achieved in this way:

[0005] A dispensing valve comprises an upper valve body, a lower valve body, a dispensing nozzle and a dispensing nozzle outer cover; the upper valve body comprises a main chamber penetrating the upper and lower end surfaces of the upper valve body, the main chamber comprises a first air control chamber and a first material chamber from top to bottom, a first valve cover is fixed to the upper end of the upper valve body, the first air control chamber and the first material chamber are separated by a first sealing device, a first piston sliding up and down is arranged in the first air control chamber, a valve stem is fixedly connected to the lower end of the first piston, the valve stem passes downward through the first sealing device and extends out of the first material chamber, a sealing head located below the first material chamber is fixedly connected to the lower end of the valve stem, and a sealing head located below the first material chamber is fixedly connected to the sealing head of the sealing head. The first end is a sealing port for matching with the sealing head, a first spring sleeved on the outside of the valve stem is arranged between the first piston and the first sealing device, a first air port and a second air port leading to the first air control cavity are arranged on the side of the upper valve body, the first air port and the second air port are respectively located on the upper side and the lower side of the first piston, a glue inlet leading to the first material cavity is arranged on the side of the upper valve body, a second air control cavity is arranged at the bottom of the upper valve body, a second piston sliding up and down is arranged in the second air control cavity, and also includes a third air port and a fourth air port leading to the second air control cavity, the third air port and the fourth air port are respectively located on the upper side and the lower side of the second piston The lower valve body is fixed to the bottom of the upper valve body, the upper end surface of the lower valve body is provided with a first back-suction cavity corresponding to the glue inlet, and a second sealing device cavity corresponding to the second air control cavity, a second sealing device is arranged in the second sealing device cavity, a second downward valve stem channel is arranged at the bottom of the second sealing device cavity, a second material cavity I leading to the bottom surface of the lower valve body is arranged at the bottom of the second valve stem channel, and a back-suction channel leading from the first back-suction cavity to the second material cavity I is also arranged in the lower valve body; the glue dispensing nozzle is detachably fixed to the bottom of the lower valve body, and the upper end surface of the glue dispensing nozzle is provided with a second sealing device corresponding to the second air control cavity The material chamber I corresponds to the second material chamber II, and the bottom of the second material chamber II is provided with a glue outlet hole which leads downward to the lower end surface of the glue dispensing nozzle. A valve needle is fixed to the lower end of the second piston, and the valve needle passes downward through the second sealing device and extends into the second material chamber II. The lower end of the valve needle is used to control the opening and closing of the glue outlet hole, and a second spring which is sleeved outside the valve needle is arranged between the second piston and the second sealing device; the glue dispensing nozzle cover is detachably sleeved outside the glue dispensing nozzle, and an interval blowing chamber is arranged between the glue dispensing nozzle cover and the glue dispensing nozzle, and the upper end of the blowing chamber is a blowing port which blows toward the lower end of the glue outlet hole, and also includes an air inlet channel leading to the blowing chamber.

[0006] Furthermore, the middle of the valve cover includes an adjusting screw hole and a sliding hole from the upper end surface to the lower end surface in sequence, an adjusting bolt is arranged in the adjusting screw hole, and an anti-loosening nut is arranged outside the adjusting bolt, and the anti-loosening nut is located on the upper end surface of the valve cover, and a sliding column is fixedly connected to the middle of the upper end of the first piston, and the upper end of the sliding column is rotatably connected to the adjusting bolt, and a sealing ring I is arranged on the outer side wall of the sliding column.

[0007] Furthermore, a radial T-shaped groove is formed on the lower outer side surface of the adjusting bolt, a T-shaped rod matching the T-shaped groove is fixedly connected to the upper end of the sliding column, and a first sealing ring is provided between the valve cover and the first air control chamber.

[0008] Furthermore, a first piston seal is arranged on the outer side wall of the first piston, a valve stem screw hole is opened on the lower end surface of the first piston, and the upper end of the valve stem is an upper screw section matching the valve stem screw hole; a second piston seal is fixed to the outer circumferential side surface of the second piston.

[0009] Furthermore, a first sealed cavity section is provided between the first air control cavity and the first material cavity, and the first sealing device is fixed in the first sealed cavity section; the first sealing device comprises a sealing bushing, and at least two sealing rings II are provided on the outer circumferential side of the sealing bushing, and a bushing cavity extending to the lower end surface is provided in the middle of the upper end surface of the sealing bushing, and the bushing cavity comprises an upper sealed cavity, a rod hole and a lower sealed cavity from top to bottom, and the diameter of the rod hole is smaller than that of the upper sealed cavity and the lower sealed cavity, and a sealing pressure ring is fixedly sleeved in the upper sealed cavity, and at least one sealing ring I is provided between the outer circumferential side of the sealing pressure ring and the side wall of the upper sealed cavity II, a sealing ring IV is arranged between the lower end face of the sealing pressure ring and the lower end face of the upper sealing cavity, a sealing ring IX is fixed in the lower sealing cavity, and the sealing pressure ring is fixed in the upper sealing cavity by a retaining ring through a hole; a circle of fixing grooves is arranged in the middle of the outer side wall of the sealing bushing, and fixing screw holes leading to the sealing cavity are arranged on the outer side wall opposite to the valve body, and set screws extending to the fixing grooves are arranged in the fixing screw holes; the second sealing device includes a sealing bushing II, a sealing ring V is arranged between the sealing bushing II and the second sealing device cavity, and a sealing ring VI is arranged between the sealing bushing II and the valve needle.

[0010] Furthermore, the sealing head is a conical plug with a small top and a large bottom, the sealing port is a conical port with a small top and a large bottom, the glue outlet hole is a conical hole with a large top and a small bottom, and the lower end of the valve needle is a conical head with a large top and a small bottom.

[0011] Furthermore, the lower end of the valve stem is a lower screw section with an outer diameter smaller than that of the upper part of the valve stem, the lower screw section is covered with the sealing head, the outer thread of the lower screw section is connected to a fixing nut for fixing the sealing head, at least one circle of sealing ring VII is arranged on the outer surface of the sealing head, and at least one circle of sealing ring VIII is arranged between the sealing head and the lower screw section.

[0012] Furthermore, the upper valve body includes a main valve body and a sub-valve body, the sub-valve body is fixed on the side of the lower part of the main valve body, the main chamber is located in the main valve body, and the second air control chamber is located in the sub-valve body; an upper end surface of the sub-valve body is provided with an adjustment channel leading to the second air control chamber, the adjustment channel includes an adjustment screw hole II and a sliding hole II from top to bottom, an adjustment bolt II is arranged in the adjustment channel, an anti-loosening nut II is arranged outside the adjustment bolt II, the anti-loosening nut II is located on the upper end surface of the sub-valve body, the adjustment bolt II includes an upper threaded column and a lower sliding column, and at least one circle of second sealing ring is arranged on the outer circumferential surface of the lower sliding column.

[0013] Furthermore, a third sealing ring is arranged between the sealing port and the first back-suction chamber; a fourth sealing ring is arranged between the second air control chamber and the second sealing device chamber; a fifth sealing ring is arranged between the dispensing nozzle and the lower valve body; a sixth sealing ring is arranged between the dispensing nozzle cover and the lower valve body; the valve cover is fixedly connected to the upper valve body by screws, and the upper valve body and the lower valve body are fixedly connected by screws II; the dispensing nozzle cover is connected to the lower end of the lower valve body by a connecting nut, and a downwardly convex connecting stud section is arranged at the lower end of the lower valve body, and a connecting nut is arranged on the connecting stud section, and an inwardly contracted clamping hole is arranged at the lower end of the connecting nut, and a clamping ring matching the clamping hole is fixed to the upper outer side of the dispensing nozzle cover, a clamping groove portion is arranged at the inner upper end outside the dispensing nozzle, and a plurality of clamping block portions matching the clamping groove portion are arranged at the upper outer side of the dispensing nozzle.

[0014] Beneficial effects of the utility model:

[0015] 1. The utility model adopts a two-stage valve closing structure. When the dispensing is completed, the sealing head in the first stage is closed first. The sealing head adopts the form of reverse valve closing, so that when the valve is closed, the space of the first back-suction chamber changes from small to large, so that the pressure in the first back-suction chamber drops, forming an instantaneous back-suction phenomenon, and after the residual glue in the glue outlet hole, the second material chamber I and the second material chamber II in the second stage is sucked back into the back-suction channel and the first back-suction chamber, the needle valve in the second stage is closed again. At this time, there is no residual glue in the glue outlet hole, the second material chamber I and the second material chamber II. When the valve needle is closed, there is naturally no residual glue being squeezed out, so as to prevent the problems of glue hanging, glue dripping and large clumps of glue. When the valve needle in the second stage is closed, air enters the air inlet channel, and the wind is blown out from the air outlet after passing through the blowing chamber, so as to prevent the problem of wire drawing.

[0016] 2. The first sealing device in the utility model adopts a multiple sealing structure to prevent the medium from flowing between the first air control chamber and the first material chamber, thereby increasing the service life.

[0017] 3. The second sealing device in the utility model adopts a double sealing structure to prevent the medium from flowing between the second air control chamber and the second material chamber I, thereby increasing the service life.

[0018] 4. The utility model can adjust the glue output by adjusting bolt II and adjusting bolt. After adjustment, it can be locked and prevented by anti-loosening nut II and anti-loosening nut. It is suitable for scenes with different glue output amounts, easy to adjust and high precision. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a three-dimensional diagram of the dispensing valve of the utility model;

[0021] Figure 2 This is the front view of the dispensing valve of the utility model;

[0022] Figure 3 for Figure 2 Sectional view along line AA;

[0023] Figure 4 It is a top view of the dispensing valve of the utility model;

[0024] Figure 5 for Figure 4 Sectional view along line BB;

[0025] Figure 6 It is a three-dimensional diagram of the adjusting bolt in the utility model;

[0026] Figure 7 It is a cross-sectional view of the valve cover in the utility model;

[0027] Figure 8 It is a cross-sectional view of the first piston, valve stem and sealing head in the utility model;

[0028] Fig. 9 It is a three-dimensional diagram of the first piston and the valve stem in the utility model;

[0029] Fig.10 It is a cross-sectional view of the first sealing device in the utility model;

[0030] Fig.11 It is a cross-sectional view of the second sealing device and the second spring pressure block in the utility model;

[0031] Fig.12 It is a cross-sectional view of the upper valve body of the utility model;

[0032] Fig.13 It is a cross-sectional view of the lower valve body, the dispensing nozzle and the outer cover of the dispensing nozzle in the utility model.

[0033] Reference numerals in the figure: 1-upper valve body, 11-first air control cavity, 111-first air port, 112-second air port, 12-first material cavity, 121-sealing port, 122-glue inlet, 13-second air control cavity, 131-third air port, 132-fourth air port, 14-first sealing cavity section, 15-fixing screw hole, 16-fastening screw, 17-main valve body, 18-auxiliary valve body, 19-adjusting channel, 191-adjusting screw hole II, 192-sliding hole II, 2-lower valve body, 21-first back suction cavity, 22-second sealing cavity Sealing device cavity, 23-second valve stem hole, 24-second material cavity I, 25-return suction channel, 26-fourth sealing ring, 27-fifth sealing ring, 28-screw II, 29-connecting stud section, 3-dispensing nozzle, 31-second material cavity II, 32-glue outlet hole, 33-third sealing ring, 4-dispensing nozzle cover, 41-blowing cavity, 42-blowing port, 43-air inlet channel, 44-sixth sealing ring, 45-connecting nut, 5-first sealing device, 50-sealing bushing, 501-sealing ring II, 51-upper sealing cavity, 52-stem hole, 53-lower sealing chamber, 54-sealing pressure ring, 541-sealing ring III, 542-sealing ring IV, 55-sealing ring IX, 56-hole retaining ring, 57-fixing groove, 61-first piston, 611-first piston seal, 612-valve stem screw hole, 62-valve stem, 621-upper screw section, 622-lower screw section, 63-sealing head, 631-sealing ring VII, 632-sealing ring VIII, 64-first spring, 65-sliding column, 651-T-rod, 66-sealing ring I, 67-fixing nut, 71-second piston, 711-second piston seal, 72-second sealing device, 721-sealing bushing II, 722-sealing ring V, 723-sealing ring VI, 73-valve needle, 74-second spring, 75-second spring pressure block, 8-valve cover, 81-adjusting screw hole, 82-sliding hole, 83-adjusting bolt, 831-T-slot, 84-locking nut, 85-first sealing ring, 86-screw, 9-adjusting bolt II, 91-locking nut II, 92-upper threaded column, 93-lower sliding column, 94-second sealing ring. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] Reference Figure 1-13 A dispensing valve comprises an upper valve body 1, a lower valve body 2, a dispensing nozzle 3 and a dispensing nozzle outer cover 4.

[0036] The upper valve body 1 includes a main chamber that passes through the upper and lower end surfaces of the upper valve body, and the main chamber includes a first air control chamber 11 and a first material chamber 12 from top to bottom. A first valve cover 8 is fixed to the upper end of the upper valve body 1. The first air control chamber 11 and the first material chamber 12 are separated by a first sealing device 5. A first piston 61 that slides up and down is arranged in the first air control chamber 11. The lower end of the first piston 61 is fixedly connected to a valve stem 62. The valve stem 62 passes downward through the first sealing device 5 and extends out of the first material chamber 12. The lower end of the valve stem 62 is fixedly connected to a sealing head 63 located below the first material chamber 12. The lower end of the first material chamber 12 is a sealing port 121 that cooperates with the sealing head 63. The first piston 61 and the first sealing A first spring 64 is arranged between the devices 5 and is sleeved on the outside of the valve stem 62. A first air port 111 and a second air port 112 leading to the first air control chamber 11 are provided on the side of the upper valve body 1. The first air port 111 and the second air port 112 are respectively located on the upper and lower sides of the first piston 61. A glue inlet 122 leading to the first material chamber 12 is provided on the side of the upper valve body 1. A second air control chamber 13 is provided at the bottom of the upper valve body 1. A second piston 71 sliding up and down is provided in the second air control chamber 13. The third air port 131 and the fourth air port 132 leading to the second air control chamber 13 are also included. The third air port 131 and the fourth air port 132 are respectively located on the upper and lower sides of the second piston 71.

[0037] The lower valve body 2 is fixed to the bottom of the upper valve body 1, and the upper end surface of the lower valve body 2 is provided with a first back-suction cavity 21 corresponding to the glue inlet 122, and a second sealing device cavity 22 corresponding to the second air control cavity 13, a second sealing device 72 is arranged in the second sealing device cavity 22, a downward second valve stem channel 23 is provided at the bottom of the second sealing device cavity 22, a second material cavity I24 leading to the bottom surface of the lower valve body 2 is provided at the bottom of the second valve stem channel 23, and a back-suction channel 25 leading from the first back-suction cavity 21 to the second material cavity I24 is also provided in the lower valve body 2.

[0038] The glue dispensing nozzle 3 is detachably fixed to the bottom of the lower valve body 2, and a second material chamber II31 corresponding to the second material chamber I24 is provided on the upper end face of the glue dispensing nozzle 2, and a glue outlet hole 32 extending downward to the lower end face of the glue dispensing nozzle 3 is provided at the bottom of the second material chamber II31, and a valve needle 73 is fixed to the lower end of the second piston 71, and the valve needle 73 extends downward through the second sealing device 72 into the second material chamber II31, and the lower end of the valve needle 73 is used to control the opening and closing of the glue outlet hole 32, and a second spring 74 is provided between the second piston 71 and the second sealing device 72 and is sleeved outside the valve needle 73.

[0039] The dispensing nozzle cover 4 is detachably mounted on the outside of the dispensing nozzle 3, and a spaced blowing chamber 41 is provided between the dispensing nozzle cover 4 and the dispensing nozzle 3. The upper end of the blowing chamber 41 is a blowing port 42 blowing toward the lower end of the glue outlet hole, and also includes an air inlet channel 43 leading to the blowing chamber 41.

[0040] As a further embodiment, the middle of the valve cover 8 includes an adjusting screw hole 81 and a sliding hole 82 from the upper end surface to the lower end surface in sequence, an adjusting bolt 83 is arranged in the adjusting screw hole 81, and a locking nut 84 is arranged outside the adjusting bolt 83, and the locking nut 84 is located on the upper end surface of the valve cover 8, and a sliding column 65 is fixedly connected to the middle of the upper end of the first piston 61, and the upper end of the sliding column 65 is rotatably connected to the adjusting bolt 83, and a sealing ring I66 is arranged on the outer wall of the sliding column 65.

[0041] As a further embodiment, a radial T-slot 831 is provided on the lower outer side surface of the adjusting bolt 83, the upper end of the sliding column 65 is fixedly connected with a T-rod 651 that cooperates with the T-slot 831, and a first sealing ring 85 is provided between the valve cover 8 and the first air control chamber 11.

[0042] As a further embodiment, a first piston seal 611 is provided on the outer side wall of the first piston 61, a valve stem screw hole 612 is provided on the lower end surface of the first piston 61, the upper end of the valve stem 62 is an upper screw section 621 matched with the valve stem screw hole 612, and a second piston seal 711 is fixed to the outer circumferential side surface of the second piston 71. The first piston seal 611 and the second piston seal 711 can be selected as bidirectional piston seals or unidirectional piston seals.

[0043] As a further embodiment, a first sealed cavity section 14 is provided between the first air control cavity 11 and the first material cavity 12, and the first sealing device 5 is fixed in the first sealed cavity section 14; the first sealing device 5 includes a sealing bushing 50, and at least two sealing rings II501 are provided on the outer circumferential side of the sealing bushing 50, and a bushing cavity extending to the lower end surface is opened in the middle of the upper end surface of the sealing bushing 50, and the bushing cavity includes an upper sealed cavity 51, a rod hole 52 and a lower sealed cavity 53 from top to bottom, and the diameter of the rod hole 52 is less than An upper sealing chamber 51 and a lower sealing chamber 53, a sealing pressure ring 54 is fixedly sleeved in the upper sealing chamber 51, at least one sealing ring III541 is arranged between the outer circumferential side surface of the sealing pressure ring 54 and the side wall of the upper sealing chamber 51, a sealing ring IV542 is arranged between the lower end surface of the sealing pressure ring 54 and the lower end surface of the upper sealing chamber 51, a sealing ring IX55 is fixedly sleeved in the lower sealing chamber 53, and the sealing pressure ring 54 is fixed in the upper sealing chamber 51 through a hole with a retaining ring 56; wherein, the sealing ring IX55 can select a pneumatic tie rod seal or an O-ring.

[0044] The lower surface of the first piston 61 and the upper surface of the sealing bushing are also provided with a spring positioning groove for positioning the first spring.

[0045] A circle of fixing grooves 57 are formed in the middle of the outer wall of the sealing bushing 50 , and fixing screw holes 15 leading to the sealing cavity are formed on the opposite outer wall of the valve body 1 . Set screws 16 extending to the fixing grooves 57 are arranged in the fixing screw holes 15 .

[0046] The second sealing device 72 includes a sealing sleeve II721, a sealing ring V722 is arranged between the sealing sleeve II721 and the second sealing device cavity 22, a sealing ring VI723 is arranged between the sealing sleeve II721 and the valve needle 73, and a second spring pressure block 75 is also arranged above the sealing sleeve. A spring positioning groove II is opened on the upper surface of the second spring pressure block 75, and the second spring pressure block is sleeved outside the valve needle 73.

[0047] As a further embodiment, the sealing head 63 is a conical plug with a small top and a large bottom, the sealing port 121 is a conical port with a small top and a large bottom, the glue outlet hole 32 is a conical hole with a large top and a small bottom, and the lower end of the valve needle 73 is a conical head with a large top and a small bottom.

[0048] As a further embodiment, the lower end of the valve stem 62 is a lower screw section 622 whose outer diameter is smaller than the upper part of the valve stem, and the lower screw section 622 is covered with the sealing head 63. The lower screw section 622 is externally threadedly connected with a fixing nut 67 for fixing the sealing head 63, and at least one circle of sealing ring VII631 is arranged on the outer surface of the sealing head 63, and at least one circle of sealing ring VIII632 is arranged between the sealing head 63 and the lower screw section 622.

[0049] As a further embodiment, the upper valve body 1 includes a main valve body 17 and an auxiliary valve body 18, the auxiliary valve body 18 is fixed on the side of the lower part of the main valve body 17, the main chamber is located in the main valve body 17, and the second air control chamber is located in the auxiliary valve body 18.

[0050] An adjusting channel 19 leading to the second air control chamber 13 is provided on the upper end surface of the auxiliary valve body 18. The adjusting channel includes an adjusting screw hole II191 and a sliding hole II192 from top to bottom. An adjusting bolt II9 is ​​arranged in the adjusting channel 19. A locking nut II91 is arranged outside the adjusting bolt II9. The locking nut II91 is located on the upper end surface of the auxiliary valve body 18. The adjusting bolt II9 includes an upper threaded column 92 and a lower sliding column 93. At least one circle of second sealing ring 94 is arranged on the outer circumferential surface of the lower sliding column 93.

[0051] As a further embodiment, a third sealing ring 33 is provided between the sealing port 121 and the first back-sucking chamber 21; a fourth sealing ring 26 is provided between the second air control chamber 13 and the second sealing device chamber 22; a fifth sealing ring 27 is provided between the dispensing nozzle 3 and the lower valve body 2; a sixth sealing ring 44 is provided between the dispensing nozzle cover 4 and the lower valve body 2; the valve cover 8 is fixedly connected to the upper valve body 1 by screws 86, and the upper valve body 1 and the lower valve body 2 are connected by screws II28 fixed connection; the dispensing nozzle outer cover 4 is connected to the lower end of the lower valve body 2 through a connecting nut 45, and the lower end of the lower valve body 2 is provided with a downwardly protruding connecting stud section 29, and the connecting nut is arranged on the connecting stud section 29, and the lower end of the connecting nut 45 is provided with an inwardly contracted clamping hole, and the upper outer part of the dispensing nozzle outer cover 4 is fixed with a clamping ring that cooperates with the clamping hole, and the inner upper end outside the dispensing nozzle 3 is provided with a clamping groove part, and the upper outer part of the dispensing nozzle 3 is provided with a plurality of clamping block parts that cooperate with the clamping groove parts.

[0052] When the glue dispensing is finished, the second air port 112 takes in air, pushing the first piston 61 to move upward, and the first piston 61 drives the sealing head 63 to move upward through the valve stem 62 to block the sealing port 121. The space of the first back-suction chamber changes from small to large, and the internal pressure drops, forming an instantaneous back-suction phenomenon, and the residual glue in the glue outlet hole, the second material chamber I and the second material chamber II in the second stage is sucked back into the back-suction channel and the first back-suction chamber. The third air port 131 takes in air, pushing the second piston 71 to move downward, and the lower end of the valve needle supports the glue outlet hole 32, and the glue outlet hole 32 is closed. At this time, there is no residual glue in the glue outlet hole, the second material chamber I and the second material chamber II. When closed, naturally no residual glue is squeezed out, and problems such as glue hanging, glue dripping and large clumps of glue will not occur. Finally, air is taken in by the air inlet channel 43, and the wind is blown out from the blowing port 42 after passing through the blowing chamber 41, blowing to the lower end of the glue outlet hole 32, and no wire drawing problem will occur.

[0053] The first sealing device 5 of the utility model adopts a multiple sealing structure to prevent the medium from flowing between the first air control chamber 11 and the first material chamber 12, and to increase the service life. The second sealing device 72 of the utility model adopts a double sealing structure to prevent the medium from flowing between the second air control chamber 13 and the second material chamber 124, and to increase the service life.

[0054] The utility model can adjust the glue output by adjusting the bolt II9 and the adjusting bolt 83. After adjustment, the anti-loosening nut II91 and the anti-loosening nut 84 are used to lock and prevent loosening. It is suitable for scenes with different glue output amounts, and the adjustment is convenient and accurate.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A dispensing valve, characterized in that: include The upper valve body comprises a main chamber that passes through the upper and lower end surfaces of the upper valve body, the main chamber comprises a first air control chamber and a first material chamber from top to bottom, a first valve cover is fixed to the upper end of the upper valve body, the first air control chamber and the first material chamber are separated by a first sealing device, a first piston that slides up and down is arranged in the first air control chamber, a valve stem is fixedly connected to the lower end of the first piston, the valve stem passes downward through the first sealing device and extends out of the first material chamber, a sealing head located below the first material chamber is fixedly connected to the lower end of the valve stem, the lower end of the first material chamber is a sealing port that cooperates with the sealing head, and the first piston is fixedly connected to the sealing head. A first spring sleeved on the valve stem is arranged between the plug and the first sealing device, a first air port and a second air port leading to the first air control cavity are arranged on the side of the upper valve body, the first air port and the second air port are respectively located on the upper side and the lower side of the first piston, a glue inlet leading to the first material cavity is arranged on the side of the upper valve body, a second air control cavity is arranged at the bottom of the upper valve body, a second piston sliding up and down is arranged in the second air control cavity, and also includes a third air port and a fourth air port leading to the second air control cavity, the third air port and the fourth air port are respectively located on the upper side and the lower side of the second piston; The lower valve body is fixed to the bottom of the upper valve body, the upper end surface of the lower valve body is provided with a first back-suction cavity corresponding to the glue inlet, and a second sealing device cavity corresponding to the second air control cavity, a second sealing device is arranged in the second sealing device cavity, a downward second valve stem hole is provided at the bottom of the second sealing device cavity, a second material cavity I leading to the bottom surface of the lower valve body is provided at the bottom of the second valve stem hole, and a back-suction channel leading from the first back-suction cavity to the second material cavity I is also provided in the lower valve body; A dispensing nozzle, which is detachably fixed to the bottom of the lower valve body, a second material cavity II corresponding to the second material cavity I is provided on the upper end surface of the dispensing nozzle, a dispensing hole extending downward to the lower end surface of the dispensing nozzle is provided at the bottom of the second material cavity II, a valve needle is fixed to the lower end of the second piston, the valve needle passes downward through the second sealing device and extends into the second material cavity II, the lower end of the valve needle is used to control the opening and closing of the dispensing hole, and a second spring sleeved outside the valve needle is provided between the second piston and the second sealing device; The dispensing nozzle cover is detachably mounted outside the dispensing nozzle, and a spaced blowing cavity is arranged between the dispensing nozzle cover and the dispensing nozzle. The upper end of the blowing cavity is a blowing port blowing toward the lower end of the glue outlet hole, and also includes an air inlet channel leading to the blowing cavity.

2. The dispensing valve according to claim 1, characterized in that: The middle of the valve cover includes an adjusting screw hole and a sliding hole in sequence from the upper end surface to the lower end surface, an adjusting bolt is arranged in the adjusting screw hole, a locking nut is arranged outside the adjusting bolt, and the locking nut is located on the upper end surface of the valve cover, a sliding column is fixedly connected to the middle of the upper end of the first piston, the upper end of the sliding column is rotatably connected to the adjusting bolt, and a sealing ring I is arranged on the outer side wall of the sliding column.

3. The dispensing valve according to claim 2, characterized in that: A radial T-shaped groove is formed on the lower outer side surface of the adjusting bolt, a T-shaped rod matching the T-shaped groove is fixedly connected to the upper end of the sliding column, and a first sealing ring is arranged between the valve cover and the first air control cavity.

4. The dispensing valve according to claim 1, characterized in that: A first piston seal is arranged on the outer wall of the first piston, a valve stem screw hole is opened on the lower end surface of the first piston, and the upper end of the valve stem is an upper screw section matched with the valve stem screw hole; a second piston seal is fixed to the outer circumferential side surface of the second piston.

5. The dispensing valve according to claim 1, characterized in that: A first sealed cavity section is provided between the first air control cavity and the first material cavity, and the first sealing device is fixed in the first sealed cavity section; the first sealing device comprises a sealing bushing, and at least two sealing rings II are provided on the outer circumferential side of the sealing bushing; a bushing cavity extending to the lower end surface is provided in the middle of the upper end surface of the sealing bushing, and the bushing cavity comprises an upper sealed cavity, a rod hole and a lower sealed cavity from top to bottom in sequence, and the diameter of the rod hole is smaller than that of the upper sealed cavity and the lower sealed cavity; a sealing pressure ring is fixedly sleeved in the upper sealed cavity, and at least one sealing ring III is provided between the outer circumferential side of the sealing pressure ring and the side wall of the upper sealed cavity, A sealing ring IV is arranged between the lower end surface of the sealing pressure ring and the lower end surface of the upper sealing cavity, a sealing ring IX is fixed in the lower sealing cavity, and the sealing pressure ring is fixed in the upper sealing cavity by a retaining ring through a hole; a circle of fixing grooves is arranged in the middle of the outer side wall of the sealing bushing, and fixing screw holes leading to the sealing cavity are arranged on the outer side wall opposite to the valve body, and set screws extending to the fixing grooves are arranged in the fixing screw holes; the second sealing device includes a sealing bushing II, a sealing ring V is arranged between the sealing bushing II and the second sealing device cavity, and a sealing ring VI is arranged between the sealing bushing II and the valve needle.

6. The dispensing valve according to claim 1, characterized in that: The sealing head is a conical plug with a small top and a large bottom, the sealing port is a conical port with a small top and a large bottom, the glue outlet hole is a conical hole with a large top and a small bottom, and the lower end of the valve needle is a conical head with a large top and a small bottom.

7. The dispensing valve according to claim 6, characterized in that: The lower end of the valve stem is a lower screw section with an outer diameter smaller than that of the upper part of the valve stem. The lower screw section is covered with the sealing head. The outer thread of the lower screw section is connected to a fixing nut for fixing the sealing head. At least one circle of sealing ring VII is arranged on the outer side surface of the sealing head, and at least one circle of sealing ring VIII is arranged between the sealing head and the lower screw section.

8. The dispensing valve according to claim 1, characterized in that: The upper valve body includes a main valve body and a sub-valve body, the sub-valve body is fixed on the side of the lower part of the main valve body, the main chamber is located in the main valve body, and the second air control chamber is located in the sub-valve body; an adjustment channel leading to the second air control chamber is opened on the upper end surface of the sub-valve body, and the adjustment channel includes an adjustment screw hole II and a sliding hole II from top to bottom, an adjustment bolt II is arranged in the adjustment channel, and an anti-loosening nut II is arranged outside the adjustment bolt II, and the anti-loosening nut II is located on the upper end surface of the sub-valve body, and the adjustment bolt II includes an upper threaded column and a lower sliding column, and at least one circle of second sealing ring is arranged on the outer circumferential surface of the lower sliding column.

9. The dispensing valve according to claim 1, characterized in that: A third sealing ring is arranged between the sealing port and the first back suction chamber; a fourth sealing ring is arranged between the second air control chamber and the second sealing device chamber; a fifth sealing ring is arranged between the dispensing nozzle and the lower valve body; a sixth sealing ring is arranged between the dispensing nozzle cover and the lower valve body; the valve cover is fixedly connected to the upper valve body by screws, and the upper valve body and the lower valve body are fixedly connected by screws II; the dispensing nozzle cover is connected to the lower end of the lower valve body by a connecting nut, and a downwardly convex connecting stud section is arranged at the lower end of the lower valve body, and a connecting nut is arranged on the connecting stud section, and an inwardly contracted clamping hole is arranged at the lower end of the connecting nut, and a clamping ring matching the clamping hole is fixed to the upper outer side of the dispensing nozzle cover, a clamping groove portion is arranged at the inner upper end outside the dispensing nozzle, and a plurality of clamping block portions matching the clamping groove portion are arranged at the upper outer side of the dispensing nozzle.

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