Dispensing valve and dispensing device

Abstract

The utility model relates to the technical field of dispensing equipment, and discloses a dispensing valve and a dispensing device. The dispensing valve comprises a valve body and a valve rod; a valve rod channel, a glue inlet channel and a glue dispensing channel which are communicated with one another are arranged in the valve body; the valve rod can move in the valve rod channel, an adjusting cavity located in the valve rod channel is formed between the free end of the valve rod and the valve rod channel, and the size of the adjusting cavity is adjusted through movement of the valve rod in the valve rod channel. The glue dispensing device comprises a glue pipe and a glue dispensing valve, and the glue pipe is communicated with a glue inlet channel of the glue dispensing valve. According to the utility model, the problems that the glue outlet of the glue dispensing channel is delayed when the valve rod is lifted up and the glue drips in the glue dispensing channel after the glue dispensing is finished are solved, meanwhile, the curing speed of the glue solution in the glue dispensing valve is delayed, the service life of the glue dispensing valve is prolonged, and the glue dispensing time is also prolonged.

Description

Technical Field

[0001] This utility model relates to the field of dispensing equipment technology, and in particular to a dispensing valve and dispensing device. Background Technology

[0002] In product processing, multi-component adhesives are often used to bond parts together. For example, an AB adhesive dispensing device uses AB adhesive to bond two parts. The AB adhesive used includes A adhesive and B adhesive. Before use, A adhesive and B adhesive are separate. When using, A adhesive and B adhesive must be injected into the mixing tube separately for mixing. After being mixed evenly, the AB adhesive is injected into the dispensing valve, and the adhesive is applied to the parts to be bonded through the dispensing needle.

[0003] In related technologies, a dispensing valve includes a valve body and a valve stem. The valve body has a valve stem channel, one side of which is connected to the glue injection channel, and the bottom end of which is connected to the dispensing channel. The valve stem is movably disposed within the valve stem channel, and a valve block is disposed at the lower end of the valve stem. The diameter of the valve block is the same as the inner diameter of the valve stem channel. The valve block can cooperate with the sealing part at the upper end of the dispensing channel to realize the connection and disconnection of the glue injection channel and the dispensing channel.

[0004] However, the above-mentioned dispensing valve has the following problems: 1. When dispensing is required, the valve stem is moved upward from the sealing position to the dispensing position. During the lifting process, a vacuum area is generated between the bottom of the valve stem and the dispensing channel. At this time, due to the existence of this vacuum area, the dispensing channel will not dispense glue immediately, resulting in a glue dispensing delay, which is not conducive to the glue dispensing needs during production; 2. When dispensing is completed, when the valve stem is pressed down from the dispensing position to the sealing position, due to the large amount of glue stored between the dispensing and sealing positions, pressing down the valve stem will cause the stored glue to drip out of the dispensing channel again. That is, after dispensing is completed, there will be a lot of glue dripping at the outlet of the dispensing channel, which will affect the dispensing effect and even cause the product to be scrapped.

[0005] Therefore, there is an urgent need for a dispensing valve and dispensing device to solve the above-mentioned technical problems. Utility Model Content

[0006] Based on the above, the purpose of this utility model is to provide a dispensing valve and dispensing device that can solve the problem of delayed dispensing from the dispensing channel when the valve stem is lifted, as well as the problem of dispensing dripping from the dispensing channel after dispensing is completed.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] On the one hand, this utility model provides a dispensing valve, including a valve body and a valve stem;

[0009] The valve body includes a valve stem channel, a glue inlet channel, and a glue dispensing channel that are connected to each other.

[0010] The valve stem is movable within the valve stem channel, and an adjustment cavity is formed between the free end of the valve stem and the valve stem channel within the valve stem channel. The size of the adjustment cavity is adjusted by the movement of the valve stem within the valve stem channel.

[0011] In some possible implementations, the valve body includes a housing and a liner, the liner being installed inside the housing; the liner having a through-cavity, the free end of the liner forming the regulating cavity between it and the housing; the inner cavity communicating with the regulating cavity to form the valve stem channel.

[0012] In some possible implementations, the free end of the liner is flush with or above the upper edge of the outlet of the glue inlet channel.

[0013] In some possible implementations, the diameter D1 of the valve stem is 1 / 5 to 3 / 5 of the outer diameter D2 of the liner.

[0014] In some possible implementations, when the valve stem extends into the regulating cavity, there is a gap between the valve stem and the regulating cavity.

[0015] In some possible implementations, the valve stem passage includes a sealing contact section, one end of which communicates with the regulating cavity, and the sealing contact section is in sliding sealing engagement with the valve stem.

[0016] In some possible implementations, the valve stem passage further includes a non-sealed contact section communicating with the other end of the sealed contact section, the inner wall of the non-sealed contact section having a gap with the valve stem.

[0017] In some possible implementations, the non-sealed contact section is at least partially tapered or stepped.

[0018] In some possible implementations, the unsealed contact section includes a connected straight section and a tapered section, one end of the tapered section communicating with the sealed contact section and the other end of the tapered section communicating with the straight section.

[0019] In some possible implementations, a dispensing needle is installed in the dispensing channel, with one end of the dispensing needle near the adjustment cavity serving as a sealing part, and the other end of the valve stem near the adjustment cavity serving as a stopping part, with the stopping part and the sealing part in sealed contact.

[0020] In some possible implementations, the adhesive stop portion is conical or arc-shaped.

[0021] In some possible implementations, the diameter D3 of the dispensing needle is 1 / 2 to 1 of the diameter D1 of the valve stem.

[0022] In some possible implementations, the end of the adjustment cavity near the dispensing channel is conical or arc-shaped.

[0023] In some possible implementations, the glue inlet channel includes a tapered first glue inlet section and a straight second glue inlet section. One end of the second glue inlet section is connected to the adjustment cavity, and the other end is connected to the first glue inlet section. The length L2 of the second glue inlet section is 1 / 5 to 3 / 5 of the length L1 of the first glue inlet section.

[0024] In some possible implementations, the valve stem includes at least a parallel section and a tapered section of the valve stem connected together.

[0025] In some possible implementations, the diameter D1 of the valve stem is 1 / 5 to 3 / 5 of the diameter D4 of the regulating cavity.

[0026] On the other hand, this utility model provides a dispensing device, including a glue tube and a dispensing valve as described in any of the above embodiments, wherein the glue tube is connected to the glue inlet channel of the dispensing valve.

[0027] The beneficial effects of this utility model are:

[0028] The dispensing valve provided by this utility model has an adjusting cavity formed between the free end of the valve stem and the valve stem channel, located within the valve stem channel. The size of the adjusting cavity changes as the valve stem moves within the valve stem channel. When the valve stem is raised from the sealing position to the dispensing position, the enlarged adjusting cavity generates negative pressure, allowing the adhesive stored in the adjusting cavity to flow quickly out of the dispensing channel below. Combined with the continuous supply of adhesive from the inlet channel, this solves the problem of delayed dispensing from the dispensing channel when the valve stem is raised. After dispensing is complete, the valve stem is pressed down from the dispensing position to the sealing position, reducing the size of the adjusting cavity. Under the pressure of the valve stem, the adhesive in the adjusting cavity can flow back into the inlet channel, resulting in minimal adhesive being squeezed into the dispensing channel, thus solving the problem of adhesive dripping from the dispensing channel after dispensing. Simultaneously, because the amount of adhesive squeezed into the dispensing channel is minimal, the amount of adhesive curing is also minimal, slowing down the curing speed of the adhesive within the dispensing valve, extending the valve's service life and dispensing time. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the dispensing valve provided in Embodiment 1 of this utility model;

[0030] Figure 2 This is a cross-sectional view of the dispensing valve provided in Embodiment 1 of this utility model;

[0031] Figure 3 This is a cross-sectional view of the outer shell provided in Embodiment 1 of this utility model;

[0032] Figure 4This is a cross-sectional view of the lining provided in Embodiment 1 of this utility model;

[0033] Figure 5 These are partial sectional views of the valve stem and dispensing needle provided in Embodiments 1 and 2 of this utility model;

[0034] Figure 6 This is a cross-sectional view of the valve stem provided in an optional embodiment of this utility model;

[0035] Figure 7 This is a cross-sectional view of the valve stem provided in another optional embodiment of this utility model;

[0036] Figure 8 This is a schematic diagram of the dispensing valve provided in Embodiment 2 of this utility model;

[0037] Figure 9 This is a cross-sectional view of the dispensing valve provided in Embodiment 2 of this utility model;

[0038] Figure 10 This is a cross-sectional view of the valve body provided in Embodiment 2 of this utility model.

[0039] In the picture:

[0040] 1. Valve body; 11. Valve stem passage; 111. Adjustment chamber; 112. Sealing contact section; 113. Non-sealing contact section; 1131. Straight section; 1132. Conical section; 12. Glue inlet channel; 121. First glue inlet section; 122. Second glue inlet section; 123. Glue inlet; 124. Glue outlet; 13. Dispensing channel;

[0041] 101. Outer shell; 1011. Inner liner mounting cavity; 102. Inner liner;

[0042] 2. Valve stem; 21. Sealing part; 22. Parallel section of valve stem; 23. Tapered section of valve stem;

[0043] 3. Dispensing needle; 31. Sealing part. Detailed Implementation

[0044] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0045] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0046] 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.

[0047] In the description of this utility model, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are merely used for distinction in description and have no special meaning.

[0048] Example 1

[0049] like Figures 1 to 5 As shown, this embodiment provides a dispensing valve for use in a dispensing device. The dispensing valve includes a valve body 1 and a valve stem 2. The valve body 1 is a three-way valve structure, internally equipped with a valve stem channel 11, a glue inlet channel 12, and a dispensing channel 13 that are interconnected. Figures 1-3 With the valve body 1 positioned at a reference angle, both the valve stem channel 11 and the dispensing channel 13 are vertically aligned, with the valve stem channel 11 positioned above the dispensing channel 13. The valve stem 2 is movably inserted into the valve stem channel 11, with its upper end protruding from the top of the valve body 1 for connection to an external drive mechanism. This allows the drive mechanism to move the valve stem 2 upwards or downwards within the valve stem channel 11. An adjustment cavity 111 is formed between the free end of the valve stem 2 and the valve stem channel 11. The size of the adjustment cavity 111 is adjusted by the movement of the valve stem 2 within the valve stem channel 11. In this embodiment, the free end of the valve stem 2 refers to the end of the valve stem 2 not connected to the drive mechanism, i.e. Figure 2 The lower end of the valve stem 2. A glue inlet channel 12 is located on one side of the valve stem channel 11. The glue inlet 123 of the glue inlet channel 12 is used to connect to an external glue tube, and the glue outlet 124 of the glue inlet channel 12 is connected to the regulating chamber 111, thereby allowing the uniformly mixed glue to be injected into the regulating chamber 111. In this embodiment, the valve stem 2 has a sealing position and a dispensing position when moving up and down. When the valve stem 2 moves downward to the sealing position, it disconnects the glue dispensing channel 13 from the glue outlet 124, preventing the glue in the valve stem channel 11 from flowing into the glue dispensing channel 13. When the valve stem 2 moves upward to the dispensing position, the glue dispensing channel 13 connects to the glue outlet 124, allowing the glue in the glue inlet channel 12 to flow out sequentially through the glue outlet 124, the regulating chamber 111, and the glue dispensing channel 13, thus achieving the dispensing function.

[0050] In this embodiment, an adjusting cavity 111 is provided between the free end of the valve stem 2 and the valve stem channel 11. The size of the adjusting cavity 111 is changed by the movement of the valve stem 2 within the valve stem channel 11. When the valve stem 2 is raised from the sealing position to the dispensing position, the enlarged adjusting cavity 111 generates negative pressure, allowing the adhesive stored in the adjusting cavity 111 to flow out quickly from the dispensing channel 13 below. Furthermore, the adhesive inlet channel 12 continuously supplies adhesive to the adjusting cavity 111, thus solving the problem of delayed dispensing from the dispensing channel 13 when the valve stem 2 is raised. After dispensing is completed... When valve stem 2 is pressed down from the dispensing position to the sealing position, the regulating chamber 111 becomes smaller. Under the squeezing action of valve stem 2, the adhesive in the regulating chamber 111 can partially flow back into the dispensing channel 12, thus minimizing the amount of adhesive squeezed into the dispensing channel 13 by valve stem 2. This solves the problem of adhesive dripping from the dispensing channel 13 after dispensing. At the same time, because the amount of adhesive squeezed into the dispensing channel 13 is minimal, the amount of adhesive curing is also minimal, slowing down the curing speed of the adhesive in the dispensing valve, extending the service life of the dispensing valve, and extending the dispensing time.

[0051] like Figure 2 As shown, optionally, in this embodiment, when the valve rod 2 extends into the regulating cavity 111, there is a gap between the valve rod 2 and the regulating cavity 111. This allows the gap between the outer wall of the valve rod 2 and the inner wall of the regulating cavity 111 to store adhesive when the valve rod 2 moves down into the regulating cavity 111 but does not reach the sealing position. Furthermore, the valve rod 2 will not block the dispensing port 124, and the dispensing port 124 remains connected to the regulating cavity 111, thus ensuring that adhesive is always present in the regulating cavity 111. Specifically, the diameter of the free end of the valve rod 2 can be smaller than the inner diameter of the regulating cavity 111. With the above configuration, when the valve rod 2 is raised to the dispensing position, the adhesive stored in the regulating cavity 111 will quickly flow out through the dispensing channel 13; when the valve rod 2 is pressed down from the dispensing position to the sealing position, because the diameter of the free end of the valve rod 2 is relatively small compared to the inner diameter of the regulating cavity 111, the amount of adhesive flowing back into the dispensing channel 12 and being squeezed into the dispensing channel 13 is minimal.

[0052] Optionally, such as Figure 2 and Figure 5 As shown, in this embodiment, the valve stem 2 is a straight rod, meaning the diameter D1 of the valve stem 2 remains constant. This facilitates the processing of the valve stem 2 and reduces manufacturing difficulty. When the valve stem 2 moves to the sealing position and closes the dispensing channel 13, the volume of adhesive pressed into the dispensing channel 13 within the adjusting cavity 111 is positively correlated with the cross-sectional area of ​​the valve stem 2 and the height to which the valve stem 2 descends. To effectively reduce the volume of adhesive pressed into the dispensing channel 13, this embodiment, on the one hand, places the dispensing port 124 closer to the lower end of the adjusting cavity 111, thereby reducing the height to which the valve stem 2 descends; on the other hand, it appropriately reduces the diameter D1 of the valve stem 2 to reduce its cross-sectional area. Preferably, in this embodiment, the diameter D1 of the valve stem 2 is 1 / 5 to 3 / 5 of the diameter D4 of the adjusting cavity 111. The above-described design results in a smaller diameter D1 for the valve stem 2, which significantly reduces the amount of adhesive squeezed into the dispensing channel 13 during sealing due to the downward pressure of the valve stem 2, thus reducing residual adhesive overflow. It also significantly reduces the impact of the valve stem 2 lifting on the adhesive storage volume during dispensing, avoiding the problem of delayed dispensing. For example, in this embodiment, the diameter D1 of the valve stem 2 is half the diameter D4 of the adjusting cavity 111. While reducing the diameter D1 of the valve stem 2, the strength of the valve stem 2 is also ensured, improving its service life. Optionally, in this embodiment, the diameter D1 of the valve stem 2 is 0.6 mm.

[0053] In some embodiments, the valve stem 2 may also employ a non-straight stem design, such as: the valve stem 2 includes a connected parallel section 22 and a tapered section 23 to increase the structural strength of the valve stem 2. Figure 6 As shown, in an optional embodiment, the upper section of the valve stem 2 is a tapered section 23 that is thicker at the top and thinner at the bottom, to facilitate connection with an external drive mechanism and improve connection strength; the lower section of the valve stem 2 is a parallel section 22, the diameter of which is equal to the diameter of the small end of the tapered section 23 (both are D1), to facilitate smooth movement of the valve stem 2 within the valve stem channel 11 and reduce the impact of the valve stem 2's movement on the amount of adhesive stored in the regulating cavity 111. Figure 7 As shown, in another optional embodiment, the upper and lower sections of the valve stem 2 are both parallel valve stem sections 22, and the middle section of the valve stem 2 is a tapered valve stem section 23 that is thicker at the top and thinner at the bottom. The diameter of the upper parallel valve stem section 22 is equal to the diameter of the large end of the tapered valve stem section 23, and the diameter of the lower parallel valve stem section 22 is equal to the diameter of the small end of the tapered valve stem section 23 (both are D1). This can also increase the strength of the valve stem 2 and improve the smoothness of the valve stem 2's movement within the valve stem channel 11.

[0054] like Figure 4As shown, in this embodiment, the valve stem channel 11 includes a sealing contact section 112, the lower end of which communicates with the regulating cavity 111. The diameter of the sealing contact section 112 is adapted to the diameter D1 of the valve stem 2, so that the sealing contact section 112 and the valve stem 2 slide and seal in a sealing manner. Specifically, the valve stem 2 and the sealing contact section 112 are fitted with a very small gap, for example, a 3-micron gap, to prevent adhesive dripping. Based on the above configuration, sealing is achieved through the tight fit between the valve stem 2 and the sealing contact section 112, thus eliminating the need for other sealing components, resulting in a simple structure and cost savings.

[0055] like Figure 4 As shown, the valve stem channel 11 further includes a non-sealing contact section 113 that communicates with the upper end of the sealing contact section 112. The inner wall of the non-sealing contact section 113 has a gap with the valve stem 2, thus reducing the contact area between the non-sealing contact section 113 and the valve stem 2, thereby improving the smoothness of the valve stem 2's lifting and lowering movement. In this embodiment, the non-sealing contact section 113 is at least partially conical or stepped, etc. The shape of the non-sealing contact section 113 only needs to satisfy the requirement that there is a gap between the inner wall of the non-sealing contact section 113 and the valve stem 2. The non-sealing contact section 113 facilitates mold processing and manufacturing, and also avoids the sealing contact section 112 from being too long, resulting in excessive friction on the valve stem 2 and affecting the smoothness of the valve stem 2's lifting and lowering movement. Specifically, the non-sealed contact section 113 includes a straight section 1131 and a tapered section 1132 that are connected to each other. The lower end of the tapered section 1132 is connected to the sealed contact section 112, and the upper end of the tapered section 1132 is connected to the straight section 1131. The diameters of both the straight section 1131 and the tapered section 1132 are larger than the diameter D1 of the valve stem 2, which facilitates the smooth movement of the valve stem 2 within the valve stem channel 11. At the same time, the above arrangement facilitates the machining of the valve body 1 and can improve the structural strength of the valve body 1.

[0056] like Figures 1-4 As shown, in some embodiments, the valve body 1 includes a housing 101 and an inner liner 102. The housing 101 has an inner liner mounting cavity 1011, and the inner liner 102 is installed within the inner liner mounting cavity 1011. The inner liner 102 has a through-cavity, and the free end of the inner liner 102 (i.e., Figure 2The lower end of the inner liner 102 and the outer shell 101 form the aforementioned adjustment cavity 111; the inner cavity of the inner liner 102 connects with the adjustment cavity 111 to form a valve stem channel 11. Specifically, the inner cavity of the inner liner 102 includes a first inner cavity, a second inner cavity, and a third inner cavity arranged sequentially from top to bottom. The first inner cavity is the aforementioned straight section 1131, the second inner cavity is the aforementioned tapered section 1132, and the third inner cavity is the aforementioned sealing contact section 112. The first and third inner cavities are cylindrical chambers, and the diameter of the first inner cavity is larger than the diameter of the third inner cavity; the second inner cavity is a tapered chamber, with the larger diameter end of the second inner cavity connected to the first inner cavity and the smaller diameter end of the second inner cavity connected to the third inner cavity; the area between the lower end face of the inner liner 102 (i.e., the lower end face of the third inner cavity) and the upper end of the dispensing channel 13 forms a chamber, and the free end of the valve stem 2 forms the aforementioned adjustment cavity 111 between this chamber and the chamber. This embodiment, by adding an inner liner 102, not only achieves sealed sliding of the valve stem 2 within the valve body 1, but also allows the inner liner 102 to accommodate a smaller diameter valve stem 2 while maintaining the same inner and outer diameters of the valve body 1. This reduces the diameter D1 of the valve stem 2, thereby minimizing its impact on the volume of the storage container when the valve stem 2 is raised. Simultaneously, because the valve body 1 is assembled from the outer shell 101 and the inner liner 102 through a secondary processing method, the technical and production difficulties are reduced, effectively lowering the production cost and improving product reliability. Furthermore, the diameter D1 of the valve stem 2 is 1 / 5 to 3 / 5 of the outer diameter D2 of the inner liner 102, thus ensuring good rigidity while maintaining a smaller diameter for the valve stem 2.

[0057] Regarding the position of the liner 102 relative to the glue inlet channel 12, as a preferred embodiment, such as Figure 2 As shown, the free end of the liner 102 is flush with the upper edge of the glue outlet 124 of the glue inlet channel 12. Figure 2 From the schematic perspective, in the longitudinal direction, the upper edge of the glue outlet 124 of the glue inlet channel 12 is the top edge of the glue outlet 124. Aligning the free end of the liner 102 with the upper edge of the glue outlet 124 of the glue inlet channel 12 serves two purposes: firstly, it controls the size of the adjustment chamber 111, limiting the height at which the valve stem 2 is raised, thus minimizing the amount of glue forced into the glue dispensing channel 13 within the adjustment chamber 111; secondly, it ensures that the free end of the liner 102 does not obstruct part of the glue outlet 124 of the glue inlet channel 12, guaranteeing smooth glue dispensing. Of course, the free end of the liner 102 can also be slightly higher than the upper edge of the glue outlet 124 of the glue inlet channel 12, as long as the amount of glue forced into the glue dispensing channel 13 within the adjustment chamber 111 is minimal and does not affect the glue dispensing from the glue inlet channel 12.

[0058] Furthermore, such as Figure 2As shown, a dispensing needle 3 is installed inside the dispensing channel 13. The dispensing needle 3 is hollow inside and is used to dispense glue to the part to be dispensed. The lower end of the dispensing needle 3 extends out of the bottom of the valve body 1, and the upper end of the dispensing needle 3 (i.e., the end of the dispensing needle 3 near the adjustment chamber 111) is the sealing part 31. The lower end of the valve stem 2 (i.e., the end of the valve stem 2 near the adjustment chamber 111) is the stop part 21. When the valve stem 2 is in the sealing position, the stop part 21 and the sealing part 31 are in sealed contact, thereby disconnecting the dispensing channel 13 from the adjustment chamber 111. At this time, the glue in the valve stem channel 11 cannot flow into the dispensing channel 13. When the valve stem 2 is in the dispensing position, the stop part 21 disengages from the sealing part 31, thereby connecting the dispensing channel 13 with the adjustment chamber 111. At this time, the glue in the valve stem channel 11 flows into the dispensing channel 13.

[0059] In related technologies, the sealing part is usually a stepped plane, and the lower end of the valve block of the valve stem is also a flat structure. The glue is stopped by the cooperation of the two planes. This not only results in a large impact force on the sealing part when the valve block switches the glue, but also makes it easy for residual glue to remain inside the stepped plane, which can easily cause the dispensing valve to become clogged, thus affecting the service life of the dispensing valve.

[0060] To solve the above problems, such as Figure 5 As shown, in this embodiment, the sealing part 31 is configured as a conical groove, the diameter of which gradually decreases from top to bottom. This configuration facilitates the complete drainage of adhesive from the adjusting cavity 111 along the conical groove after the dispensing process, preventing adhesive residue. Correspondingly, the adhesive-stopping part 21 is configured as a conical protrusion. The size and shape of the conical protrusion of the adhesive-stopping part 21 are adapted to the conical groove of the sealing part 31, thereby facilitating a tight fit and reliable sealing of the sealing part 31. For example, the taper of the conical groove and the conical protrusion can be 45 degrees. This embodiment employs a conical sealing section 31 and a stopping section 21. Compared to the stepped planar sealing section in related technologies, this optimizes the flow path and enables rapid dispensing. Furthermore, it eliminates structural dead corners, significantly reducing residual adhesive at the steps and preventing dry adhesive from clogging the dispensing valve. Additionally, the conical sealing section 31 reduces the impact force of the valve stem 2 on the sealing section 31 during dispensing. It should be noted that in other embodiments, the sealing section 31 can also be configured as an arc-shaped groove, and the stopping section 21 as an arc-shaped protrusion, which similarly reduces residual adhesive and the impact force on the valve stem 2. Figure 2 As shown, the end of the regulating cavity 111 near the dispensing channel 13 is also conical or arc-shaped to facilitate the outflow of adhesive and prevent residual adhesive from forming in the valve stem channel 11.

[0061] Furthermore, in this embodiment, the diameter D3 of the dispensing needle 3 is 1 / 2 to 1 of the diameter D1 of the valve stem 2. In this way, while ensuring that the dispensing needle 3 dispenses glue smoothly, the glue storage volume inside the dispensing needle 3 can be reduced, the damage of residual glue to the dispensing needle 3 can be reduced, and the life of the dispensing needle 3 can be improved.

[0062] Furthermore, in this embodiment, the length of the dispensing needle 3 is increased compared to the prior art. For example, in related technologies, the total length of the dispensing needle is 11.57 mm, and the length exposed at the bottom of the valve body is 5.98 mm. In this embodiment, the total length of the dispensing needle 3 is 17 mm to 27 mm, and the length exposed at the bottom of the valve body 1 is 11 mm to 21 mm. For instance, in this embodiment, the total length of the dispensing needle 3 is 21.57 mm, and the length exposed at the bottom of the valve body 1 is 15.98 mm, meaning the dispensing needle 3 in this embodiment is 10 mm longer than in related technologies. By increasing the length of the dispensing needle 3, this embodiment increases the distance between the dispensing device body and the dispensing station, facilitating the dispensing device's avoidance of structures such as optical detection devices during operation.

[0063] In this embodiment, the valve body 1 is a one-piece structure. Specifically, the valve body 1 is made of plastic and is integrally molded using an injection molding process, which saves mold costs and improves the structural strength of the valve body 1. Figures 1-4 As shown, the liner 102 can also be made of plastic and integrally molded using injection molding. Of course, in other embodiments, the valve body 1 and the liner 102 can also be made of other materials and using other processes, and are not limited to this embodiment.

[0064] like Figure 2 As shown, in this embodiment, the glue inlet channel 12 is inclined, and the angle between the glue inlet channel 12 and the valve stem channel 11 is an acute angle, such as 30 degrees or 45 degrees. This arrangement facilitates the flow of glue in the glue inlet channel 12 and helps to reduce the wall thickness between the glue inlet channel 12 and the valve stem channel 11 on the valve body 1, thereby improving the injection molding quality of the product. Figure 3As shown, specifically, the glue inlet channel 12 includes a first glue inlet section 121 and a second glue inlet section 122. The first glue inlet section 121 is conical, with its larger end serving as the glue inlet 123, and its smaller end connected to one end of the second glue inlet section 122. The second glue inlet section 122 is straight, with its other end providing the aforementioned glue outlet 124, which is connected to the adjusting cavity 111. This structure allows the first glue inlet section 121 of the glue inlet channel 12 to be closer to the conical section 1132 of the liner 102, resulting in a thinner wall thickness between the glue inlet channel 12 and the valve stem channel 11, further improving the injection molding quality of the valve body 1 and reducing the formation of air bubbles during the injection molding process. Furthermore, the length L2 of the second glue inlet section 122 is 1 / 5 to 3 / 5 of the length L1 of the first glue inlet section 121. On the one hand, it is beneficial for the glue to enter the regulating chamber 111 from the glue inlet channel 12 during the glue dispensing process. On the other hand, when the valve rod 2 is pressed down after the glue dispensing is completed, the glue in the regulating chamber 111 can flow back smoothly into the glue inlet channel 12.

[0065] Example 2

[0066] like Figures 8-10 as well as Figure 5 As shown, this embodiment provides another dispensing valve, which has a similar structure to the dispensing valve in Embodiment 1. It also includes a valve body 1, a valve stem 2, and a dispensing needle 3. The following content of this embodiment only describes the structure that is different from that of Embodiment 1. The content that is the same as that of Embodiment 1 will not be described again.

[0067] like Figure 9 , Figure 10 As shown, compared with Embodiment 1, the dispensing valve in this embodiment does not have an inner liner. Instead, the valve stem channel 11 is formed by the arrangement of internal cavities of different diameters inside the valve body 1. Specifically, the valve stem channel 11 in this embodiment includes a first channel segment, a second channel segment, a third channel segment, and a chamber formed between the lower end face of the third channel segment and the upper end of the dispensing channel 13, arranged sequentially from top to bottom. The first channel segment is the straight segment 1131 described in Embodiment 1, the second channel segment is the tapered segment 1132 described in Embodiment 1, and the third channel segment is the sealing contact segment 112 described in Embodiment 1.

[0068] like Figure 9 , Figure 10As shown, the first and third channel segments are both cylindrical channels, with the diameter of the first channel segment being larger than that of the third channel segment. The second channel segment is a conical channel, with its larger diameter end connected to the first channel segment and its smaller diameter end connected to the third channel segment. A chamber is formed between the lower end face of the third channel segment and the upper end of the dispensing channel 13, and the adjustment cavity 111 is formed between the free end of the valve stem 2 and this chamber. In this embodiment, the diameter of the third channel segment is matched with the diameter D1 of the valve stem 2, and the valve stem 2 and the third channel segment are in a sealing sliding fit. Specifically, the valve stem 2 and the third channel segment are fitted with a very small gap, for example, a 3-micron gap, to prevent dispensing. The above configuration achieves sealing through a tight fit between the valve stem 2 and the inner wall of the third channel segment, eliminating the need for other sealing components, resulting in a simple structure and cost savings.

[0069] In this embodiment, the diameters of both the first and second channel sections are larger than the diameter D1 of the valve stem 2. This arrangement reduces the contact area between the inner wall of the valve body 1 and the valve stem 2, thereby improving the smoothness of the valve stem 2's lifting and lowering movement. Furthermore, the diameter of the third channel section can be appropriately reduced, along with the diameter D1 of the corresponding valve stem 2, to further reduce the impact on the volume of the glue reservoir when the valve stem 2 is raised.

[0070] In a preferred embodiment, the position of the lower end face of the third channel segment relative to the glue inlet channel 12 is the same as that in Embodiment 1, where the free end of the liner 102 is positioned relative to the glue inlet channel 12. That is, the lower end face of the third channel segment is flush with or slightly higher than the upper edge of the glue outlet 124 of the glue inlet channel 12.

[0071] In this embodiment, the valve stem channel 11 is obtained by directly setting chambers of different diameters inside the valve body 1, without the need for additional lining. Its structure is simpler, with fewer parts, which helps to save costs.

[0072] Example 3

[0073] This embodiment provides a dispensing device, including a glue tube and a dispensing valve as described in Embodiment 1 or Embodiment 2. The glue tube is connected to the glue inlet channel 12 of the dispensing valve for injecting glue into the dispensing valve. The glue tube can be a mixing tube for uniformly mixing glue A and glue B, thereby injecting the uniformly mixed AB glue solution into the dispensing valve. The dispensing device of this embodiment can avoid the problem of glue delay in dispensing channel 13 when the valve rod 2 is lifted and the problem of glue dripping from dispensing channel 13 after dispensing is completed.

[0074] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A dispensing valve, characterized in that, Includes valve body (1) and valve stem (2); The valve body (1) includes a valve stem channel (11), a glue inlet channel (12), and a glue dispensing channel (13) that are connected to each other; The valve stem (2) is movable within the valve stem channel (11). An adjustment cavity (111) is formed between the free end of the valve stem (2) and the valve stem channel (11). The size of the adjustment cavity (111) is adjusted by the movement of the valve stem (2) within the valve stem channel (11).

2. The dispensing valve according to claim 1, characterized in that, The valve body (1) includes an outer shell (101) and an inner liner (102), the inner liner (102) being installed inside the outer shell (101); the inner liner (102) having a through inner cavity, the free end of the inner liner (102) forming the regulating cavity (111) between the outer shell (101); the inner cavity of the inner liner (102) communicating with the regulating cavity (111) to form the valve stem channel (11).

3. The dispensing valve according to claim 2, characterized in that, The free end of the liner (102) is flush with or higher than the upper edge of the glue outlet (124) of the glue inlet channel (12).

4. The dispensing valve according to claim 2, characterized in that, The diameter D1 of the valve stem (2) is 1 / 5 to 3 / 5 of the outer diameter D2 of the liner (102).

5. The dispensing valve according to claim 1 or 2, characterized in that, When the valve stem (2) extends into the regulating cavity (111), there is a gap between the valve stem (2) and the regulating cavity (111).

6. The dispensing valve according to claim 1 or 2, characterized in that, The valve stem passage (11) includes a sealing contact section (112), one end of which is connected to the regulating cavity (111), and the sealing contact section (112) is in sliding sealing cooperation with the valve stem (2).

7. The dispensing valve according to claim 6, characterized in that, The valve stem passage (11) also includes a non-sealed contact section (113) that communicates with the other end of the sealed contact section (112), and there is a gap between the inner wall of the non-sealed contact section (113) and the valve stem (2).

8. The dispensing valve according to claim 7, characterized in that, The unsealed contact section (113) is at least partially conical or stepped.

9. The dispensing valve according to claim 7, characterized in that, The non-sealed contact section (113) includes a straight section (1131) and a tapered section (1132) that are connected. One end of the tapered section (1132) is connected to the sealed contact section (112), and the other end of the tapered section (1132) is connected to the straight section (1131).

10. The dispensing valve according to claim 1 or 2, characterized in that, A dispensing needle (3) is installed in the dispensing channel (13). The end of the dispensing needle (3) near the adjustment cavity (111) is a sealing part (31). The end of the valve stem (2) near the adjustment cavity (111) is a stopping part (21). The stopping part (21) and the sealing part (31) are in sealed contact.

11. The dispensing valve according to claim 10, characterized in that, The adhesive stop part (21) is conical or arc-shaped.

12. The dispensing valve according to claim 10, characterized in that, The diameter D3 of the dispensing needle (3) is 1 / 2 to 1 of the diameter D1 of the valve stem (2).

13. The dispensing valve according to claim 1 or 2, characterized in that, The end of the adjustment cavity (111) near the dispensing channel (13) is conical or arc-shaped.

14. The dispensing valve according to claim 1 or 2, characterized in that, The glue inlet channel (12) includes a conical first glue inlet section (121) and a straight second glue inlet section (122). One end of the second glue inlet section (122) is connected to the adjustment cavity (111), and the other end is connected to the first glue inlet section (121). The length L2 of the second glue inlet section (122) is 1 / 5 to 3 / 5 of the length L1 of the first glue inlet section (121).

15. The dispensing valve according to claim 1 or 2, characterized in that, The valve stem (2) includes at least a parallel section (22) and a tapered section (23) connected to each other.

16. The dispensing valve according to claim 1 or 2, characterized in that, The diameter D1 of the valve stem (2) is 1 / 5 to 3 / 5 of the diameter D4 of the regulating cavity (111).

17. A dispensing device, comprising a dispensing tube, characterized in that, It also includes a dispensing valve as described in any one of claims 1-16, wherein the glue tube is connected to the glue inlet channel (12) of the dispensing valve.

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