Rotary dispensing valve

Abstract

The application discloses a rotary glue dispensing valve and belongs to the field of glue dispensing valves. The rotary glue dispensing valve comprises a main valve body, a first gas port, a second gas port, a first limiting block, a second limiting block, a first rotating shaft, a bearing, a vane, a second rotating shaft, a glue inlet and a glue outlet. The first rotating shaft is connected with the second rotating shaft, the first rotating shaft is fixed with the vane, the upper portion of the inside of the main valve body is provided with a cavity, the cavity is divided into a first cavity and a second cavity by the first limiting block, the second limiting block and the first rotating shaft, the second limiting block and the inner wall of the main valve body are provided with a gap for the circulation of gas between the first cavity and the second cavity, the first gas port is communicated with the first cavity, the second gas port is communicated with the second cavity, the lower portion of the main valve body is communicated with the glue inlet, the side wall of the second rotating shaft is provided with a glue inlet channel, and the lower portion of the second rotating shaft is provided with a glue outlet channel communicated with the glue inlet channel. The glue can be switched between flowing and stopping flowing in a rotary shearing mode, and the problem of different head sizes can be perfectly solved.

Description

Technical Field

[0001] The invention belongs to the field of glue dispensing valves, and in particular relates to a rotary glue dispensing valve. Background Art

[0002] In today's industrial production, dispensing, as a key technology, is widely used in numerous industries, including electronics, automotive, medical, and aerospace. The quality and accuracy of dispensing directly impact product performance, reliability, and overall quality. Therefore, efficient and precise dispensing technology has always been a focus of research and development within the industry.

[0003] Among the many dispensing methods, pneumatic dispensing has become a common method due to its ease of operation, relatively low cost, and adaptability to various working environments. However, existing pneumatic dispensing technologies generally use a striker-type structure, which is mainly divided into two types: ejection type and suction type.

[0004] The operating principle of an ejector-type tappet dispensing valve is to use air pressure to push a tappet, forcing the glue liquid out of the nozzle. In this manner, when dispensing begins, the sudden movement of the tappet and the initial flow characteristics of the glue liquid at the nozzle can easily lead to a large accumulation of glue liquid at the starting point, a phenomenon known as "starting point bulk." This not only affects the product's appearance but can also result in excessive glue flow, causing problems such as overflow and sticking in subsequent processes, impacting product performance and quality.

[0005] A back-suction needle dispensing valve uses air pressure to generate a suction force at the end of dispensing, pulling the needle back and attempting to stop the flow of glue. However, in practice, this method often struggles to precisely control the magnitude and timing of the back-suction force. If the back-suction force is insufficient, the glue cannot stop flowing in time, resulting in excess glue accumulation at the end of the dot, creating a "bulky tail." Excessive back-suction force can also retract some of the already squeezed glue, affecting the integrity and shape of the dot and similarly failing to meet high-quality dispensing requirements.

[0006] Whether using ejection or suction-type tappet dispensing valves, the "overshoot" problem remains difficult to fully resolve during the dispensing process. This issue not only limits the application of pneumatic dispensing technology in areas requiring extremely precise dot placement (such as high-precision electronic component packaging and the manufacture of tiny biomedical devices), but also increases production costs by requiring additional steps to address defective products resulting from this overshoot. Furthermore, to minimize the impact of this overshoot, operators often need to expend additional time and effort adjusting dispensing parameters, which reduces production efficiency.

[0007] Therefore, developing a new type of pneumatic dispensing technology capable of effectively overcoming the "size head" problem has important practical significance for improving dispensing quality, reducing production cost and improving production efficiency, and is also a technical problem to be solved in the current field. SUMMARY

[0008] The present application aims to provide a rotary dispensing valve to overcome at least one of the above-mentioned deficiencies in the prior art.

[0009] To achieve this purpose, the present application adopts the following technical solutions:

[0010] The rotary dispensing valve provided by the present application comprises a main valve body, a first gas port, a second gas port, a first limiting block, a second limiting block, a first rotating shaft, a bearing, a vane, a second rotating shaft, a glue inlet, and a glue outlet. The inside of the main valve body is fixed with a plurality of bearings, the first rotating shaft and the second rotating shaft pass through the bearings, the first rotating shaft is connected with the second rotating shaft, the first rotating shaft is fixed with a vane, the upper part of the inside of the main valve body has a chamber, the vane is located in the chamber, the chamber is fixed with a first limiting block and a second limiting block for limiting the rotation of the vane, the first limiting block, the second limiting block, and the first rotating shaft divide the chamber into a first cavity and a second cavity, the second limiting block and the inner wall of the main valve body have a gap for the circulation of gas between the first cavity and the second cavity, the first gas port is communicated with the first cavity, the second gas port is communicated with the second cavity, the lower part of the main valve body is communicated with a glue inlet, the side wall of the second rotating shaft has a glue inlet channel, the lower part of the second rotating shaft has a glue outlet channel communicated with the glue inlet channel, the bottom of the main valve body has a glue outlet, and the glue outlet channel is communicated with the glue outlet.

[0011] Preferably, the upper side wall, the outer side wall, and the lower side wall of the vane are provided with a first sealing element between the inner wall of the main valve body.

[0012] Preferably, the vane has a mounting groove extending from the upper side wall to the outer side wall and the lower side wall of the vane.

[0013] Preferably, the first limiting block has a plurality of first grooves and second grooves, the first grooves are communicated with the first cavity, and the second grooves are communicated with the second cavity.

[0014] Preferably, the plurality of first grooves and the plurality of second grooves are equidistantly spaced along the height direction of the first limiting block.

[0015] Preferably, the second sealing element is arranged between the first rotating shaft and the main valve body on the upper and lower sides of the chamber.

[0016] Preferably, the second rotating shaft is provided with a ceramic bushing, and the side wall of the ceramic bushing has a connecting channel communicated with the glue inlet and the glue inlet channel.

[0017] Preferably, a third seal is provided between the second rotating shaft and the ceramic bushing on the upper and lower sides of the connecting channel, and a fourth seal is provided between the second rotating shaft and the main valve body on the upper and lower sides of the ceramic bushing.

[0018] Preferably, the glue outlet component includes a connector body and a nut. The connector body is connected to the bottom of the main valve body. The nut is screwed to the connector body. The bottom of the main valve body has a glue guide channel. The nut is provided with a glue outlet. The glue outlet channel is connected to the glue guide channel. The connector body connects the glue guide channel and the glue outlet.

[0019] Preferably, it further comprises a mounting block and a coupling, the side wall of the main valve body is fixed with the mounting block, and the first rotating shaft and the second rotating shaft are connected via the coupling.

[0020] The beneficial effects of the present invention are:

[0021] 1. Through forward and reverse blowing, the glue is switched between flowing and stopping in a rotary shearing manner. There is no impact in this process. Whether it is the beginning or the end of dispensing, the amount of glue can be kept uniform and stable, which can perfectly solve the problem of large and small heads.

[0022] 2. By combining the first rotating shaft with the second rotating shaft, the dual rotating shaft structure can better disperse the force, reduce the vibration and offset caused by rotation, and thus improve the stability and accuracy of dispensing.

[0023] 3. The first rotating shaft is driven to rotate by blowing the blades, thereby rotating the second rotating shaft. This driving method is relatively simple and does not require a complex air path arrangement, thus reducing the overall complexity and cost of the equipment.

[0024] 4. The arrangement of the first groove and the second groove allows the blade to be pushed more smoothly.

[0025] 5. The ceramic bushing is provided to provide stable support for the second rotating shaft, ensure the position accuracy of the second rotating shaft during the rotation process, prevent the second rotating shaft from radial or axial movement, ensure the smoothness of the rotational motion, and thus ensure the uniformity of glue discharge and glue cutting.

[0026] 6. The glue channel acts as a buffer for the glue, stabilizing the flow rate and pressure during the dispensing process. This ensures a relatively uniform flow of glue at the beginning, middle, and end of the dispensing process. This ensures that the size, shape, and amount of glue at each dispensing point are more consistent, improving overall product quality and consistency, reducing product quality variations caused by dispensing head size issues, and facilitating quality control in large-scale production. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a main structural schematic diagram of the present invention.

[0028] Figure 2 It is a schematic diagram of the three-dimensional structure of the present invention.

[0029] Figure 3 It is a schematic diagram of the three-dimensional exploded structure of the upper part of the present invention.

[0030] Figure 4 It is a partial main structural schematic diagram of the upper part of the present invention.

[0031] Figure 5 yes Figure 4 Schematic diagram of the AA-axis cross-sectional structure (glue dispensing is on).

[0032] Figure 6 yes Figure 4 Schematic diagram of the AA-axis cross-sectional structure (glue dispensing closed state).

[0033] Figure 7 It is a schematic diagram of the three-dimensional structure of the blade and the first rotating shaft of the present invention.

[0034] Figure 8 It is a schematic diagram of the three-dimensional structure of the first limiting block of the present invention.

[0035] Figure 9 It is a partial three-dimensional exploded structural schematic diagram of the present invention.

[0036] Figure 10 This is a schematic diagram of the main structure of the lower part of the main valve body, the second rotating shaft, and the ceramic bushing of the present invention.

[0037] Figure 11 yes Figure 10 Schematic diagram of the cross-sectional structure in the middle BB direction.

[0038] Figure 12 It is a schematic diagram of the top view of the lower part of the present invention.

[0039] Figure 13 yes Figure 12 Schematic diagram of the CC-direction cross-sectional structure.

[0040] The marks in the accompanying drawings are: 1-main valve body, 2-first air port, 3-second air port, 4-first limit block, 5-second limit block, 6-first rotating shaft, 7-bearing, 8-blade, 9-second rotating shaft, 10-glue inlet, 11-glue outlet, 12-first cavity, 13-second cavity, 91-glue inlet channel, 92-glue outlet channel, 14-first sealing member, 81-mounting groove, 41-first groove, 42-second groove, 15-second sealing member, 16-ceramic bushing, 161-connecting channel, 17-third seal, 18-fourth seal, 111-connector body, 112-nut, 19-glue guide channel, 1121-glue outlet, 20-mounting block, 21-coupling, 22-gap. DETAILED DESCRIPTION

[0041] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0042] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field. In the description of the present invention, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and should not be understood as indicating or implying relative importance.

[0043] like Figures 1 to 13 As shown, a rotary dispensing valve provided in this embodiment includes a main valve body 1, a first air port 2, a second air port 3, a first limit block 4, a second limit block 5, a first rotating shaft 6, a bearing 7, a blade 8, a second rotating shaft 9, a glue inlet 10, a glue outlet 11, a mounting block 20, and a coupling 21. Several bearings 7 are fixed inside the main valve body 1, the first rotating shaft 6 and the second rotating shaft 9 both pass through the bearing 7, the first rotating shaft 6 is connected to the second rotating shaft 9, and the first rotating shaft 6 is fixed with a blade 8. There is a chamber above the interior of the main valve body 1, and the blade 8 is located in the chamber. The first limit block 4 and the second limit block 5 for limiting the rotation of the blade 8 are fixed in the chamber. The first limit block 4 and the second limit block 5 Block 5 and the first rotating shaft 6 divide the chamber into a first chamber 12 and a second chamber 13. There is a gap 22 between the second limit block 5 and the inner wall of the main valve body 1 for gas to circulate in the first chamber 12 and the second chamber 13. The first air port 2 is connected to the first chamber 12, and the second air port 3 is connected to the second chamber 13. The lower part of the main valve body 1 is connected to the glue inlet 10, and the side wall of the second rotating shaft 9 has a glue inlet channel 91. The lower part of the second rotating shaft 9 has a glue outlet channel 92 connected to the glue inlet channel 91. The bottom of the main valve body 1 has a glue outlet part 11, and the glue outlet channel 92 is connected to the glue outlet part 11. The side wall of the main valve body 1 is fixed with a mounting block 20, and the first rotating shaft 6 and the second rotating shaft 9 are connected by a coupling 21.

[0044] During glue discharge, air is blown into the first cavity 12 through the first air port 2, rotating the blades 8. This rotates the first shaft 6, which in turn drives the second shaft 9, causing the glue inlet channel 91 to rotate opposite the glue inlet 10. Glue then flows through the glue inlet 10, via the glue inlet channel 91, into the glue outlet channel 92, and ultimately out through the glue outlet 11. The blades 8 push the air in the first cavity 12 through the gap 22 into the second cavity 13, where it is discharged through the second air port 3. When glue discharge is not required, air is blown into the second cavity 13 through the second air port 3, driving the blades 8 in the opposite direction. This causes the first shaft 6 to rotate in the opposite direction, driving the second shaft 9 in the opposite direction, shifting the glue inlet channel 91 away from the glue inlet 10 and cutting off the glue supply. In this way, by blowing air in both directions, a rotational shearing method is used to switch the glue flow between on and off, without shock, effectively solving the glue head problem. And through the design of the first rotating shaft 6 combined with the second rotating shaft 9, the dual-rotating shaft structure can better disperse the force, reduce the vibration and offset caused by rotation, and thus improve the stability and accuracy of glue dispensing. Furthermore, by blowing the blades 8 to drive the first rotating shaft 6 to rotate, and then to rotate the second rotating shaft 9, this driving method is relatively simple and does not require a complex air path arrangement, reducing the overall complexity and cost of the equipment. In addition, by flexibly adjusting the wind force and angle of the blowing blades 8, the rotation speed and angle of the dual rotating shafts can be accurately controlled, thereby achieving precise control of the amount of glue. In actual production, whether it is the starting or ending stage of glue dispensing, the amount of glue can be kept uniform and stable, effectively solving the problem of glue dispensing head size. The first limit block 4 and the second limit block 5 are set to limit the rotation of the blade 8. When the blade 8 rotates to abut against the first limit block 4, the glue feed channel 91 is just opposite to the glue feed port 10.

[0045] A first seal 14 is provided between the upper, outer, and lower sidewalls of the blade 8 and the inner wall of the main valve body 1. In this embodiment, the first seal 14 is a sealing strip. The blade 8 has a mounting groove 81 extending from the upper sidewall to the outer and lower sidewalls of the blade 8. The first seal 14 provides a seal, ensuring that the airflow pushes the blade 8.

[0046] The first stopper 4 has a plurality of first grooves 41 and second grooves 42. The first grooves 41 communicate with the first cavity 12, and the second grooves 42 communicate with the second cavity 13. The plurality of first grooves 41 and the plurality of second grooves 42 are equally spaced along the height of the first stopper 4. The first grooves 41 provide a more uniform distribution of airflow entering the first cavity 12 through the first air port 2. The second grooves 42 also provide a more uniform distribution of airflow entering the second cavity 13 through the second air port 3. This, in turn, allows the blade 8 to be pushed more smoothly.

[0047] Second sealing members 15 are provided between the first rotating shaft 6 and the main valve body 1 at the upper and lower sides of the chamber. In this embodiment, second sealing members 15 are O-rings. These second sealing members 15 provide a seal, preventing gas from leaking out of the chamber through the gap between the first rotating shaft 6 and the main valve body 1. This ensures the chamber's tightness and further ensures the smooth and uniform rotation of the blades 8. This, in turn, allows the first rotating shaft 6 to rotate smoothly and uniformly, ensuring uniform glue dispensing and cutting.

[0048] The second rotating shaft 9 is covered with a ceramic bushing 16, the sidewall of which has a connecting channel 161 connecting the glue inlet 10 and the glue inlet channel 91. The ceramic bushing 16 provides stable support for the second rotating shaft 9, ensuring the position accuracy of the second rotating shaft 9 during rotation, preventing radial or axial movement of the second rotating shaft 9, ensuring smooth rotation, and thus ensuring uniform glue discharge and cutting.

[0049] A third seal 17 is provided between the second rotating shaft 9 and the ceramic bushing 16 on the upper and lower sides of the connecting passage 161, and a fourth seal 18 is provided between the second rotating shaft 9 and the main valve body 1 on the upper and lower sides of the ceramic bushing 16. In this embodiment, the third seal 17 is an O-ring, and the fourth seal 18 is a shaft seal, both of which provide a seal to prevent leakage of the adhesive.

[0050] Among them, the glue outlet part 11 includes a connector body 111 and a nut 112. The connector body 111 is connected to the bottom of the main valve body 1, and the nut 112 is screwed to the connector body 111. The bottom of the main valve body 1 has a glue guide channel 19, and the nut 112 is provided with a glue outlet 1121. The glue outlet channel 92 is connected to the glue guide channel 19, and the connector body 111 is connected to the glue guide channel 19 and the glue outlet 1121. The glue guide channel 19 acts as a buffer for the glue, and the glue guide channel 19 makes the flow rate and pressure of the glue more stable during the glue dispensing process. Whether at the beginning, middle or end of the glue dispensing, it can ensure that the glue flows out in a relatively uniform state. This makes the size, shape and glue amount of each glue dispensing point more consistent, improves the overall quality and consistency of the product, reduces the product quality differences caused by the problem of glue dispensing head size, and is conducive to quality control in large-scale production.

[0051] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, it should be understood by those skilled in the art that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A rotary dispensing valve, characterized by: It includes a main valve body, a first air port, a second air port, a first limit block, a second limit block, a first rotating shaft, a bearing, a blade, a second rotating shaft, a glue inlet, and a glue outlet; A plurality of bearings are fixed inside the main valve body, the first rotating shaft and the second rotating shaft both pass through the bearings, and the first rotating shaft is connected to the second rotating shaft; The first rotating shaft is fixed with a blade; A chamber is provided above the interior of the main valve body, the blade is located in the chamber, and a first limit block and a second limit block are fixed in the chamber for limiting the rotation of the blade; The first limiting block, the second limiting block, and the first rotating shaft divide the chamber into a first cavity and a second cavity; There is a gap between the second limit block and the inner wall of the main valve body for gas to flow between the first cavity and the second cavity; The first air port is in communication with the first cavity, and the second air port is in communication with the second cavity; The lower part of the main valve body is connected to a glue inlet, the side wall of the second rotating shaft has a glue inlet channel, and the lower part of the second rotating shaft has a glue outlet channel connected to the glue inlet channel; The bottom of the main valve body is provided with a glue outlet component, and the glue outlet channel is communicated with the glue outlet component.

2. The rotary dispensing valve according to claim 1, characterized in that: A first sealing member is provided between the upper side wall, the outer side wall, and the lower side wall of the blade and the inner wall of the main valve body.

3. The rotary dispensing valve according to claim 2, characterized in that: The blade has a mounting groove, and the mounting groove extends from the upper side wall of the blade to the outer side wall and the lower side wall of the blade.

4. The rotary dispensing valve according to claim 1, characterized in that: The first limiting block has a plurality of first grooves and a second groove. The first grooves are communicated with the first cavity, and the second grooves are communicated with the second cavity.

5. The rotary dispensing valve according to claim 4, characterized in that: The plurality of first grooves and the plurality of second grooves are distributed at equal intervals along the height direction of the first limiting block.

6. The rotary dispensing valve according to claim 1, characterized in that: A second sealing member is provided between the first rotating shaft and the main valve body at the upper and lower sides of the chamber.

7. The rotary dispensing valve according to claim 1, characterized in that: The second rotating shaft outer shell is provided with a ceramic bushing; The side wall of the ceramic bushing is provided with a connecting channel communicating with the glue inlet and the glue inlet channel.

8. The rotary dispensing valve according to claim 7, characterized in that: A third sealing member is provided between the second rotating shaft and the ceramic bushing located at the upper and lower sides of the connecting channel; A fourth sealing member is provided between the second rotating shaft and the main valve body at the upper and lower sides of the ceramic bushing.

9. The rotary dispensing valve according to claim 1, characterized in that: The glue discharging part includes a joint body and a nut; The joint body is connected to the bottom of the main valve body, and the nut is screwed to the joint body; The bottom of the main valve body is provided with a glue guide channel, the nut is provided with a glue outlet, the glue outlet channel is communicated with the glue guide channel, and the connector body is connected with the glue guide channel and the glue outlet.

10. The rotary dispensing valve according to claim 1, characterized in that: Also includes mounting blocks and couplings; A mounting block is fixed to the side wall of the main valve body; The first rotating shaft and the second rotating shaft are connected via a coupling.

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