Spray-type ring-shaped dispensing nozzle and dispensing equipment thereof

Abstract

This invention discloses a spray-type annular dispensing nozzle and a dispensing device having the same. The nozzle includes a dispensing valve and a gas mixing unit. The dispensing valve includes a valve body and a dispensing needle. The dispensing needle is disposed on the valve body and has an axially extending glue channel inside. The gas mixing unit includes an air inlet seat and a needle sleeve. The air inlet seat is adapted to connect to an external air source to receive gas. The needle sleeve is disposed on the air inlet seat and sleeved over the dispensing needle. An air channel is defined between the needle sleeve and the dispensing needle. The air channel communicates with the air inlet seat and surrounds the glue channel so that the gas in the air inlet seat can flow into the air channel. The lower end of the needle sleeve and the lower end of the dispensing needle define an annular nozzle. The spray direction of the annular nozzle is at a predetermined angle to the axis of the needle sleeve. Both the glue channel and the air channel communicate with the annular nozzle, so that the glue in the glue channel and the gas in the air channel mix at the annular nozzle and are sprayed out in a mist. This invention can achieve a mist-like ring spray dispensing with high dispensing precision.

Description

Technical Field

[0001] This invention relates to the field of dispensing technology, and more particularly to a spray-type annular dispensing nozzle and dispensing equipment having the same. Background Technology

[0002] In modern manufacturing, precise dispensing technology is crucial for the production and quality control of many workpieces. The technologies and methods involved in the dispensing process are constantly evolving and innovating to meet ever-increasing demands for production efficiency and quality. In this context, circumferential dispensing technology, which involves applying adhesive to the inner walls of holes in workpieces, is widely used in many industries, such as electronics, automotive, and aerospace. The main purpose of this technology is to form a uniform adhesive layer on the inner walls of holes in workpieces to achieve sealing, fixation, or other functions. However, traditional circumferential dispensing methods have some problems, such as insufficient precision and low efficiency. These problems can lead to increased production costs, decreased product quality, and even affect the stability of the entire production line.

[0003] Specifically, the circumferential dispensing method disclosed in related technologies typically employs an eccentric nozzle that is driven to rotate around an axis by a drive mechanism. After one rotation, the nozzle can spray 360° onto the inner wall of the orifice, forming a ring of adhesive. However, this spraying method has several problems. First, it is difficult to guarantee the accuracy of the spraying; for example, the thickness of the adhesive layer may be uneven, making it difficult to achieve the required thinner adhesive layer thickness, and the spraying area may be inaccurate. This can lead to unstable product performance or even product failure. Second, this circumferential dispensing method is inefficient. The nozzle needs to complete one full rotation on each workpiece, which means that the production speed is limited. On high-volume production lines, this inefficient dispensing method can lead to production bottlenecks and affect the efficiency of the entire production process. Summary of the Invention

[0004] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, the object of this invention is to provide a spray-type annular dispensing nozzle and a dispensing device having the same.

[0005] To achieve the above objectives, in one aspect, a spray-type annular dispensing nozzle according to an embodiment of the present invention includes:

[0006] A dispensing valve, comprising a valve body and a dispensing needle, wherein the dispensing needle is disposed on the valve body and has an axially extending adhesive channel inside the dispensing needle;

[0007] A gas mixing unit, comprising an air inlet seat and a needle sleeve, wherein the air inlet seat is adapted to be connected to an external gas source for receiving gas supplied by the gas source.

[0008] The needle sleeve is disposed on the air inlet seat and sleeved on the dispensing needle. An air passage is defined between the needle sleeve and the dispensing needle. The air passage communicates with the air inlet seat and surrounds the dispensing passage so that the gas in the air inlet seat can flow into the air passage.

[0009] The lower end of the needle cannula and the lower end of the dispensing needle define an annular nozzle. The spray direction of the annular nozzle is at a predetermined angle to the axial direction of the needle cannula. The adhesive channel and the air channel are both connected to the annular nozzle, so that the adhesive in the adhesive channel and the gas in the air channel are mixed at the annular nozzle and sprayed out in a mist.

[0010] In addition, the spray-type annular dispensing nozzle according to the above embodiments of the present invention may also have the following additional technical features:

[0011] According to one embodiment of the present invention, the airway is configured as a spiral channel arranged spirally around the axis of the dispensing needle.

[0012] According to one embodiment of the present invention, an annular mixing cavity is further defined between the needle cannula and the dispensing needle, the annular mixing cavity being located between the air passage and the annular nozzle, and the adhesive passage and the air passage communicating with the annular nozzle through the annular mixing cavity.

[0013] According to one embodiment of the present invention, the peripheral wall of the dispensing needle is provided with a plurality of dispensing holes, the plurality of dispensing holes are arranged at intervals along the circumference of the dispensing needle, and each dispensing hole communicates the lower end of the glue channel with the annular mixing chamber.

[0014] According to one embodiment of the present invention, the dispensing needle includes:

[0015] The rod extends vertically, and the adhesive channel is formed within the rod, with its lower end being a closed end. A spiral groove is formed on the outer circumferential surface of the rod, and the spiral groove is spirally arranged around the axis of the rod. The inner circumferential surface of the upper end of the needle sleeve is in contact with the outer circumferential surface of the rod to close the spiral groove and form the air passage.

[0016] A cylindrical portion is connected to the lower end of the rod portion, the diameter of the cylindrical portion is smaller than the diameter of the rod portion, and the annular mixing cavity is defined between the inner circumferential surface of the lower end of the needle sleeve and the outer circumferential surface of the cylindrical portion.

[0017] A stop head is provided at the lower end of the cylindrical portion, and the annular nozzle is defined between the upper end face of the stop head and the lower end face of the needle sleeve.

[0018] According to one embodiment of the present invention, the air intake seat includes:

[0019] An isolation seat is fixed to the lower end of the valve body, and an air outlet chamber is defined between the isolation seat and the lower end of the valve body; the upper end of the needle sleeve is connected to the bottom of the isolation seat;

[0020] An external connector is sleeved outside the isolation seat, and an annular cavity is defined between the external connector and the isolation seat;

[0021] The external connector has an air supply channel, one end of which is adapted to connect to the air source, and the other end of which extends through to the annular cavity. The isolation seat is provided with an air guide hole, which connects the annular cavity to the air chamber, and the air chamber is connected to the upper end of the air passage.

[0022] According to one embodiment of the present invention, the lower end of the valve body has a needle seat, and the upper end of the dispensing needle is connected to the needle seat;

[0023] The isolation seat includes a sleeve portion and a nozzle portion. The sleeve portion is sleeved and fixed on the valve body. The nozzle portion is formed at the bottom of the sleeve portion. The needle seat is received inside the nozzle portion and defines the air chamber between the needle seat and the nozzle portion. There are multiple air guide holes, which are circumferentially spaced on the peripheral wall of the nozzle portion.

[0024] According to one embodiment of the present invention, the external connector includes a socket and a channel seat. The socket has a first through hole and a second through hole that communicate with each other. The second through hole is located below the first through hole. The channel seat is connected to one side of the socket, and the air supply channel is formed in the channel seat and communicates with the first through hole.

[0025] The upper end of the sleeve portion has a first mounting platform that protrudes radially, the first mounting platform being fitted into the first through hole and sealed by a first sealing ring; the nozzle portion has a second mounting platform that protrudes radially, the second mounting platform being fitted into the second through hole and sealed by a second sealing ring.

[0026] According to one embodiment of the present invention, the external connector is further provided with a pressure relief valve for controlling whether the air supply channel is connected to the atmospheric side.

[0027] On the other hand, the dispensing device according to an embodiment of the present invention has a spray-type annular dispensing nozzle as described above.

[0028] According to embodiments of the present invention, the spray-type annular dispensing nozzle and dispensing equipment are equipped with a gas mixing unit and designed with an annular nozzle. The adhesive supplied by the dispensing valve and the gas introduced from the gas source through the air passage of the needle cannula are mixed to form a mist, which is then sprayed out at high speed from the annular nozzle. This spraying method forms a ring of adhesive layer in one spray. Furthermore, the atomized spraying allows for precise dispensing through pressure, stroke, and other control, resulting in a more uniform adhesive layer thickness, stable and accurate spraying area, and the ability to control the spraying of thinner adhesive layers. In addition, the spraying is completed in one go, resulting in higher efficiency.

[0029] Additional aspects and advantages of the invention 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 invention. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the structure of the spray-type annular dispensing nozzle according to an embodiment of the present invention;

[0032] Figure 2 This is an exploded view of the spray-type annular dispensing nozzle of an embodiment of the present invention;

[0033] Figure 3 This is a front view of the spray-type annular dispensing nozzle according to an embodiment of the present invention;

[0034] Figure 4 This is a side view of a spray-type annular dispensing nozzle according to an embodiment of the present invention;

[0035] Figure 5 yes Figure 3 Sectional view at point AA;

[0036] Figure 6 yes Figure 5 A magnified view of a section at point A in the middle;

[0037] Figure 7 yes Figure 4 Sectional view at point BB;

[0038] Figure 8 This is an exploded view of the air mixing unit in the spray-type annular dispensing nozzle of this invention.

[0039] Figure 9 This is a schematic diagram of the dispensing needle in the spray-type annular dispensing nozzle of this invention.

[0040] Figure label:

[0041] 10. Dispensing valve;

[0042] 101. Valve body;

[0043] 102. Dispensing needle;

[0044] 1021. Pole section;

[0045] 1022. Cylindrical portion;

[0046] 1023. Block the head;

[0047] 103. Needle holder;

[0048] 104. Valve stem;

[0049] P101, Valve cavity;

[0050] H10, adhesive channel;

[0051] H101, dispensing hole;

[0052] H102, glue inlet channel;

[0053] 20. Mixing unit;

[0054] 201. Air intake seat;

[0055] 201a, Isolation seat;

[0056] 2011a, Mouth area;

[0057] 2012a, Sleeve section;

[0058] 201b, External connector;

[0059] 2011b, socket;

[0060] 2012b, Channel seat;

[0061] 202. Needle cannula;

[0062] H2O, airway;

[0063] H201, Gas supply channel;

[0064] P201, Annular cavity;

[0065] H2O2, air vent;

[0066] H2O3, gas chamber;

[0067] H2O4, annular nozzle;

[0068] P202, Annular mixing chamber;

[0069] 203. Pressure relief valve.

[0070] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0071] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0072] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "circumferential," and "radial," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0073] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0074] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0075] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0076] The following describes in detail, with reference to the accompanying drawings, an embodiment of the present invention: a spray-type annular dispensing nozzle and a dispensing device having the same.

[0077] Reference Figures 1 to 9 As shown, the spray-type annular dispensing nozzle provided according to an embodiment of the present invention includes a dispensing valve 10 and a mixing unit 20.

[0078] Specifically, the dispensing valve 10 includes a valve body 101 and a dispensing needle 102. The dispensing needle 102 is disposed on the valve body 101, and has an axially extending adhesive channel H10 inside the dispensing needle 102. It can be understood that the dispensing valve 10 also includes a valve stem 104, a valve stem 104 driving assembly, etc. The valve body 101 is provided with an adhesive inlet channel H102 and a valve cavity P101. The adhesive inlet channel H102 communicates with the valve cavity P101, and the valve cavity P101 communicates with the adhesive channel H10. The adhesive supply device supplies adhesive into the valve cavity P101 through the adhesive inlet channel H102, and the adhesive then enters the adhesive channel H10 through the valve cavity P101. The valve stem 104 passes through the valve body 101. The valve stem 104 drive assembly drives the valve stem 104 to slide vertically, controlling the opening and closing between the valve chamber P101 and the glue channel H10, thereby realizing the switching of the dispensing valve 10 between the dispensing state and the closed state. This structure and working process are well known in the art and will not be described in detail here.

[0079] The gas mixing unit 20 includes an air inlet seat 201 and a needle sleeve 202. The air inlet seat 201 is adapted to be connected to an external gas source to receive the gas filled by the gas source. That is, the gas source can be connected to the air inlet seat 201 and gas can be supplied to the air inlet seat 201 through the gas source.

[0080] A needle sleeve 202 is disposed on the air inlet seat 201 and sleeved around the dispensing needle 102. Exemplarily, the needle sleeve 202 is located at the bottom of the air inlet seat 201. An air passage H20 is defined between the needle sleeve 202 and the dispensing needle 102. The air passage H20 communicates with the air inlet seat 201 and surrounds the adhesive passage H10, allowing gas within the air inlet seat 201 to flow into the air passage H20. That is, gas supplied to the air inlet seat 201 by the air source can enter the air passage H20. Thus, the adhesive is delivered through the adhesive passage H10 on the dispensing valve 10, while the gas is delivered through the air passage H20 on the mixing unit 20, achieving independent delivery of gas and adhesive.

[0081] The lower end of the needle sleeve 202 and the lower end of the dispensing needle 102 define an annular nozzle H204. The ejection direction of the annular nozzle H204 is at a predetermined angle to the axial direction of the needle sleeve 202. The adhesive channel H10 and the air channel H20 are both connected to the annular nozzle H204, so that the adhesive in the adhesive channel H10 and the gas in the air channel H20 are mixed in the annular nozzle H204 and sprayed out in a mist.

[0082] The annular nozzle H204 is a key component of the entire nozzle. Its ejection direction forms a predetermined angle with the axis of the needle sleeve 202. For example, in this embodiment, this predetermined angle is 90°, meaning the ejection direction is radially outward along the needle sleeve 202. Of course, this angle can be adjusted according to specific application requirements. Both the adhesive channel H10 and the air channel H20 are connected to the annular nozzle H204, allowing the adhesive in the adhesive channel H10 and the gas in the air channel H20 to mix at the annular nozzle H204. When the gas passes through the annular nozzle H204, it carries the adhesive out, forming a mist.

[0083] The H204 annular nozzle design ensures, on the one hand, a single annular spray that can cover a 360° circumferential spray range; on the other hand, it ensures that the colloid and gas are evenly mixed during spraying, forming a mist spray. This mist spraying method can achieve a more uniform colloid layer distribution and reduce bubbles and irregularities.

[0084] The following is a brief description of the process of using this spray-type annular dispensing nozzle to apply adhesive in a circumferential manner through a hole in a workpiece:

[0085] First, install the dispensing nozzle on the dispensing equipment and connect the dispensing equipment to the glue supply system and control system. Second, place the workpiece to be dispensed under the dispensing equipment, start the dispensing equipment, and the control system will insert the needle sleeve 202 of the dispensing nozzle into the hole of the workpiece, so that the annular nozzle H204 is aligned with the inner wall of the hole.

[0086] Finally, the colloid and gas are supplied. The colloid enters the colloid channel H10 through the dispensing valve 10, and the gas enters the gas channel H20 through the air inlet seat 201. When the colloid and gas mix at the annular nozzle H204, they are sprayed out in a mist, forming a ring of colloid on the orifice wall, thus completing the dispensing process. During this process, the control system can adjust parameters such as the stroke and pressure of the dispensing nozzle as needed to achieve precise dispensing control.

[0087] According to the embodiments of the present invention, the spray-type annular dispensing nozzle and dispensing equipment are equipped with a gas mixing unit 20 and an annular nozzle H204. The adhesive supplied by the dispensing valve 10 through the adhesive channel H10 is mixed with the gas introduced from the gas source through the air channel H20 of the needle sleeve 202 to form a mist, which is then sprayed out at high speed from the annular nozzle H204. This spraying method forms a ring of adhesive layer in one spray. Furthermore, the mist spraying can be precisely controlled by pressure, stroke, etc., resulting in a more uniform adhesive layer thickness, a stable and accurate spraying area, and the ability to control the spraying requirements for thinner adhesive layers. In addition, the spraying is completed in one go, resulting in higher efficiency.

[0088] Reference Figures 5 to 6 and Figure 9 As shown, in some embodiments of the present invention, the air passage H20 is configured as a spiral channel arranged helically around the axis of the dispensing needle 102. In this embodiment, the air passage H20 is configured as a spiral channel arranged helically around the axis of the dispensing needle 102, which can guide gas to the annular nozzle H204. Because the air passage H20 is spiral-shaped, the gas is forced to rotate around the axis of the dispensing needle 102 before entering the annular nozzle H204, thereby mixing the adhesive more uniformly, effectively reducing bubbles and irregularities, and thus achieving a more uniform spraying effect.

[0089] Furthermore, the spiral channel design increases gas flow rate, thereby improving spraying efficiency. As gas passes through the spiral channel, it is affected by rotation, resulting in a higher flow rate. This design allows the gas to reach the annular nozzle H204 more quickly, thus improving spraying efficiency. Moreover, the spiral channel ensures the colloid is ejected at a certain angle, rather than impacting the orifice wall perpendicularly, reducing colloid splashing and ensuring accurate spraying coverage.

[0090] Reference Figure 6 As shown, in one embodiment of the present invention, an annular mixing cavity P202 is further defined between the needle cannula 202 and the dispensing needle 102. The annular mixing cavity P202 is located between the air passage H20 and the annular nozzle H204. The adhesive passage H10 and the air passage H20 are connected to the annular nozzle H204 through the annular mixing cavity P202.

[0091] When adhesive and gas are supplied, the adhesive enters the adhesive channel H10 from the valve chamber P101, and the gas enters the air channel H20 from the air inlet seat 201, and then flows into the annular mixing chamber P202. The adhesive and gas mix in this annular mixing chamber, and then are sprayed out from the annular nozzle H204. Due to the design of the annular mixing chamber P202, the adhesive and gas can be mixed more evenly, resulting in a more uniform spraying effect and improving the spraying quality.

[0092] Reference Figure 6 As shown, in one embodiment of the present invention, the peripheral wall of the dispensing needle 102 is provided with a plurality of dispensing holes H101, the plurality of dispensing holes H101 are arranged at intervals along the circumference of the dispensing needle 102, and each dispensing hole H101 connects the lower end of the glue channel H10 to the annular mixing chamber P202.

[0093] When the adhesive flows out of the adhesive channel H10, it enters the annular mixing chamber P202 through the circumferential dispensing holes H101. Because the multiple dispensing holes H101 are spaced apart circumferentially along the dispensing needle 102, the adhesive can be evenly dispersed into the annular mixing chamber P202, achieving more thorough mixing with the gas. When it is then sprayed from the annular nozzle H204 onto the orifice wall, a more uniform and stable adhesive layer is formed, resulting in a more uniform coating effect. Furthermore, the design of multiple dispensing holes H101 also improves coating efficiency. When the adhesive flows out from the multiple dispensing holes H101, it can be mixed more quickly before being sprayed, thereby improving coating efficiency.

[0094] Reference Figure 6 and Figure 9 As shown, in one embodiment of the present invention, the dispensing needle 102 includes a rod portion 1021, a cylindrical portion 1022, and a stop head 1023. The rod portion 1021 extends vertically, and the adhesive channel H10 is formed within the rod portion 1021, with the lower end of the adhesive channel H10 being a closed end. Exemplarily, the upper end of the rod portion 1021 is connected to the bottom of the valve body 101, so that the upper end of the adhesive channel H10 communicates with the valve cavity P101.

[0095] The outer circumferential surface of the rod 1021 forms a spiral groove, which is spirally arranged around the axis of the rod 1021. The inner circumferential surface of the upper end of the needle sleeve 202 is in contact with the outer circumferential surface of the rod 1021 to close the spiral groove and form the air passage H20. That is, by providing a spiral groove on the outer circumferential surface of the rod 1021 and configuring the inner diameter of the needle sleeve 202 to match the outer diameter of the rod 1021, after the needle sleeve 202 is inserted outside the rod 1021, the inner circumferential wall of the needle sleeve 202 is in contact with the outer circumferential surface of the rod 1021, thereby closing the spiral groove and forming a spiral channel.

[0096] A cylindrical portion 1022 is connected to the lower end of the rod portion 1021. The diameter of the cylindrical portion 1022 is smaller than the diameter of the rod portion 1021. The annular mixing cavity P202 is defined between the inner circumferential surface of the lower end of the needle sleeve 202 and the outer circumferential surface of the cylindrical portion 1022. That is, the diameter of the cylindrical portion 1022 is smaller than the inner diameter of the needle sleeve 202, thereby defining the annular mixing cavity P202 between the outer circumferential surface of the cylindrical portion 1022 and the inner circumferential surface of the needle sleeve 202.

[0097] A stop head 1023 is disposed at the lower end of the cylindrical portion 1022, and the annular nozzle H204 is defined between the upper end face of the stop head 1023 and the lower end face of the needle sleeve 202. Preferably, the outer diameter of the upper end of the stop head 1023 is approximately equal to the outer diameter of the needle sleeve 202, and the stop head 1023 and the lower end of the cylindrical portion 1022 can be connected by means of snap-fit, threaded connection, welding, etc.

[0098] In this embodiment, the dispensing needle 102 has a structure consisting of a rod 1021, a cylindrical part 1022, and a stop head 1023. It can cooperate with the needle sleeve 202 to facilitate the formation of a spiral channel and an annular nozzle H204, which is beneficial for the uniform mixing of colloid and gas, thereby achieving a more uniform spraying effect. In addition, this structural design facilitates processing, molding, and assembly.

[0099] Reference Figure 5 and Figures 7 to 8 As shown, in one embodiment of the present invention, the air inlet seat 201 includes an isolation seat 201a and an external connector 201b. The isolation seat 201a is fixed to the lower end of the valve body 101. Exemplarily, the isolation seat 201a and the lower end of the valve body 101 can be fixed by means of threaded connection, sleeve connection, snap-fit ​​connection, etc. An air outlet chamber H203 is defined between the isolation seat 201a and the lower end of the valve body 101. The upper end of the needle sleeve 202 is connected to the bottom of the isolation seat 201a. The needle sleeve 202 communicates with the air outlet chamber H203.

[0100] An external connector 201b is sleeved outside the isolation seat 201a, and an annular cavity P201 is defined between the external connector 201b and the isolation seat 201a. The external connector 201b has an air supply channel H201, one end of which is adapted to connect to the air source, and the other end of which extends into the annular cavity P201. The isolation seat 201a is provided with an air guide hole H202, which connects the annular cavity P201 to the air chamber H203, and the air chamber H203 is connected to the upper end of the air passage H20.

[0101] In other words, the isolation seat 201a is located between the valve body 101 and the external seat 201b. The outer side of the isolation seat 201a and the external seat 201b define an annular cavity P201, while the inner side of the isolation seat 201a and the valve body 101 define an air chamber H203. The air supply channel H201 on the external seat 201b is connected to the annular cavity P201. The annular cavity P201 is connected to the air chamber H203 through the air guide hole H202 on the isolation seat 201a. The air chamber H203 is connected to the air passage H20. Thus, when the gas source fills the gas, the gas passes through the air supply channel H201, the annular cavity P201, the air guide hole H202, the air chamber H203, and the air passage H20 in sequence before entering the annular mixing cavity P202.

[0102] In this embodiment, the air inlet seat 201 with the above-described structure can define the formation of an air chamber H203 and an annular cavity P201, so as to facilitate the communication between the air delivery channel H201 and the air passage H20 using the annular cavity P201 and the air chamber H203. Furthermore, after the gas is buffered by the annular cavity P201 and the air chamber H203, it enters the air passage H20, allowing the gas to be ejected with a more stable pressure and flow rate, facilitating more precise dispensing control.

[0103] Reference Figure 5 As shown, in one embodiment of the present invention, the lower end of the valve body 101 has a needle seat 103, and the upper end of the dispensing needle 102 is connected to the needle seat 103.

[0104] The isolating seat 201a includes a sleeve portion 2012a and a nozzle portion 2011a. The sleeve portion 2012a is sleeved and fixed on the valve body 101. The nozzle portion 2011a is formed at the bottom of the sleeve portion 2012a. The needle seat 103 is received in the nozzle portion 2011a and defines the air chamber H203 between the nozzle portion 2011a and the nozzle portion 2011a. There are multiple air guide holes H202, and the multiple air guide holes H202 are circumferentially spaced on the peripheral wall of the nozzle portion 2011a.

[0105] In this embodiment, the nozzle 2011a is formed at the bottom of the sleeve portion 2012a and sleeved on the outside of the needle seat 103. This structural design can form a relatively small diameter air chamber H203. After the gas flows from the larger diameter annular cavity P201 into the smaller diameter air chamber H203, it further flows into the even smaller air passage H20. This progressive design ensures that the gas can be ejected from the annular nozzle H204 at a suitable pressure, achieving a more stable and reliable spraying effect.

[0106] Preferably, the lower end of the cone is formed into a cone shape with a diameter that gradually decreases from top to bottom. This cone-shaped design is beneficial for guiding the gas and concentrating it into the air passage H20, which is conducive to gas flow.

[0107] Reference Figures 5 to 8 As shown, in one embodiment of the present invention, the external connector 201b includes a socket 2011b and a channel seat 2012b. The socket 2011b has a first through hole and a second through hole that communicate with each other. The second through hole is located below the first through hole. The channel seat 2012b is connected to one side of the socket 2011b, and the air supply channel H201 is formed in the channel seat 2012b and communicates with the first through hole.

[0108] The upper end of the sleeve portion 2012a has a first mounting platform that protrudes radially, the first mounting platform being fitted into the first through hole and sealed by a first sealing ring; the nozzle portion 2011a has a second mounting platform that protrudes radially, the second mounting platform being fitted into the second through hole and sealed by a second sealing ring.

[0109] In this embodiment, the upper end of the sleeve portion 2012a and the upper end of the socket 2011b are sealed by the first assembly table, and the lower end of the nozzle portion 2011a and the socket 2011b are sealed by the second assembly table. In this way, a sealed annular cavity P201 can be defined, which has better sealing performance, and the structure is simple and easy to assemble.

[0110] Reference Figure 5 As shown, in one embodiment of the present invention, the external connector 201b is further provided with a pressure relief valve 203 for controlling whether the air supply channel H201 is connected to the atmospheric side. Preferably, the pressure relief valve 203 is a normally closed valve.

[0111] During normal operation, the pressure relief valve 203 remains closed, isolating the air supply channel H201 from the atmosphere and maintaining gas pressure within the channel, ensuring stable and normal dispensing. When gas needs to be released, such as in cases of adhesive blockage, the operator can open the pressure relief valve 203 to connect the air supply channel H201 to the atmosphere, releasing the gas, depressurizing the nozzle, and then performing maintenance.

[0112] The dispensing device according to an embodiment of the present invention has a spray-type annular dispensing nozzle as described above. It is understood that the dispensing device also includes components such as a dispensing robotic arm and a control system, which are well known to those skilled in the art and will not be described further here.

[0113] The dispensing equipment provided according to the embodiments of the present invention has the above-mentioned annular dispensing nozzle, which is equipped with a gas mixing unit 20 and designed with an annular nozzle H204. The adhesive supplied by the adhesive channel H10 of the dispensing valve 10 is mixed with the gas introduced from the gas source through the air channel H20 of the needle sleeve 202 to form a mist, and then sprayed out at high speed from the annular nozzle H204. In this spraying method, a ring of adhesive layer is formed in one spray. Moreover, the mist spraying can be precisely controlled by pressure, stroke, etc., resulting in a more uniform adhesive layer thickness, a stable and accurate spraying area, and the ability to control the spraying requirements to obtain a thinner adhesive layer. In addition, the spraying is completed in one spraying, which is more efficient.

[0114] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0115] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made under the inventive concept of the present invention using the contents of the present invention specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A spray-type annular dispensing nozzle, characterized in that, include: A dispensing valve, comprising a valve body and a dispensing needle, wherein the dispensing needle is disposed on the valve body and has an axially extending adhesive channel inside the dispensing needle; A gas mixing unit, comprising an air inlet seat and a needle sleeve, wherein the air inlet seat is adapted to be connected to an external gas source for receiving gas supplied by the gas source. The needle sleeve is disposed on the air inlet seat and sleeved on the dispensing needle. An air passage is defined between the needle sleeve and the dispensing needle. The air passage communicates with the air inlet seat and surrounds the dispensing passage so that the gas in the air inlet seat can flow into the air passage. Wherein, the lower end of the needle sleeve and the lower end of the dispensing needle define an annular nozzle, the spraying direction of the annular nozzle is at a predetermined angle to the axis of the needle sleeve, the glue channel and the air channel are both connected to the annular nozzle, so that the glue in the glue channel and the gas in the air channel are mixed at the annular nozzle and sprayed out in a mist. An annular mixing cavity is further defined between the needle cannula and the dispensing needle; The dispensing needle includes a rod, a cylindrical portion, and a stop head. The rod extends vertically, and the adhesive channel is formed within the rod, with its lower end being a closed end. A spiral groove is formed on the outer circumferential surface of the rod, and the spiral groove is spirally arranged around the axis of the rod. The inner circumferential surface of the upper end of the needle sleeve is in contact with the outer circumferential surface of the rod to close the spiral groove and form the air passage. The cylindrical portion is connected to the lower end of the rod, and the diameter of the cylindrical portion is smaller than the diameter of the rod. The inner circumferential surface of the lower end of the needle sleeve and the outer circumferential surface of the cylindrical portion define the annular mixing cavity. The stop head is located at the lower end of the cylindrical portion, and the upper end face of the stop head and the lower end face of the needle sleeve define the annular nozzle.

2. The spray-type annular dispensing nozzle according to claim 1, characterized in that, The air passage is configured as a spiral channel arranged spirally around the axis of the dispensing needle.

3. The spray-type annular dispensing nozzle according to claim 2, characterized in that, The annular mixing chamber is located between the air passage and the annular nozzle, and the adhesive passage and the air passage are connected to the annular nozzle through the annular mixing chamber.

4. The spray-type annular dispensing nozzle according to claim 3, characterized in that, The dispensing needle has a plurality of dispensing holes on its peripheral wall. The plurality of dispensing holes are arranged at intervals along the circumference of the dispensing needle, and each dispensing hole connects the lower end of the glue channel to the annular mixing chamber.

5. The spray-type annular dispensing nozzle according to claim 1, characterized in that, The air intake includes: An isolation seat is fixed to the lower end of the valve body, and an air outlet chamber is defined between the isolation seat and the lower end of the valve body; the upper end of the needle sleeve is connected to the bottom of the isolation seat; An external connector is sleeved outside the isolation seat, and an annular cavity is defined between the external connector and the isolation seat; The external connector has an air supply channel, one end of which is adapted to connect to the air source, and the other end of which extends through to the annular cavity. The isolation seat is provided with an air guide hole, which connects the annular cavity to the air chamber, and the air chamber is connected to the upper end of the air passage.

6. The spray-type annular dispensing nozzle according to claim 5, characterized in that, The lower end of the valve body has a needle seat, and the upper end of the dispensing needle is connected to the needle seat; The isolation seat includes a sleeve portion and a nozzle portion. The sleeve portion is sleeved and fixed on the valve body. The nozzle portion is formed at the bottom of the sleeve portion. The needle seat is received inside the nozzle portion and defines the air chamber between the needle seat and the nozzle portion. There are multiple air guide holes, which are circumferentially spaced on the peripheral wall of the nozzle portion.

7. The spray-type annular dispensing nozzle according to claim 6, characterized in that, The external connector includes a socket and a channel seat. The socket has a first through hole and a second through hole that communicate with each other. The second through hole is located below the first through hole. The channel seat is connected to one side of the socket and the air supply channel is formed in the channel seat and communicates with the first through hole. The upper end of the sleeve portion has a first mounting platform that protrudes radially, the first mounting platform being fitted into the first through hole and sealed by a first sealing ring; the nozzle portion has a second mounting platform that protrudes radially, the second mounting platform being fitted into the second through hole and sealed by a second sealing ring.

8. The spray-type annular dispensing nozzle according to claim 7, characterized in that, The external connector is also equipped with a pressure relief valve, which is used to control whether the air supply channel is connected to the atmospheric side.

9. A dispensing device, characterized in that, It has a spray-type annular dispensing nozzle as described in any one of claims 1 to 8.

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