Rotary dispensing valve

Abstract

The invention discloses a rotary dispensing valve, which belongs to the field of dispensing valves, and comprises a main valve body, a first air port, a second air port, a first limiting block, a second limiting block, a first rotating shaft, a bearing, a blade, a second rotating shaft, a glue inlet and a glue outlet piece, the first rotating shaft is connected with the second rotating shaft, the first rotating shaft is fixedly provided with the blade, and the second rotating shaft is connected with the bearing. A cavity is formed in the upper portion in the main valve body, the first limiting block, the second limiting block and the first rotating shaft divide the cavity into a first cavity and a second cavity, a gap allowing air to circulate in the first cavity and the second cavity is formed between the second limiting block and the inner wall of the main valve body, the first air port is communicated with the first cavity, and the second air port is communicated with the second cavity. The lower portion of the main valve body communicates with a 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 communicating with the glue inlet channel. Glue is switched between flowing and flowing stopping in a rotary shearing mode, and the problem of large and small heads 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 field, dispensing technology, as a key technology, is widely used in many industries such as electronics, automobiles, medical treatment, aerospace, etc. The quality and accuracy of dispensing directly affect the performance, reliability and overall quality of the product. Therefore, efficient and accurate dispensing technology has always been the focus of research and development in the industry.

[0003] Among the many dispensing methods, pneumatic dispensing has become one of the commonly used dispensing methods due to its advantages such as simple operation, relatively low cost, and adaptability to different working environments. However, the existing pneumatic dispensing technology generally adopts a striker structure, which is mainly divided into two types: ejection type and suction type.

[0004] The working principle of the ejector-type tappet dispensing valve is to push the tappet through air pressure to squeeze the glue out of the nozzle. In this way, when dispensing begins, due to the sudden movement of the tappet and the initial flow characteristics of the glue at the nozzle, it is easy to cause the glue to form a large accumulation at the starting point, that is, the phenomenon of "big head at the starting point". This will not only affect the appearance of the product, but may also lead to excessive glue, causing problems such as overflow and adhesion in subsequent processes, affecting the performance and quality of the product.

[0005] The back-suction type needle dispensing valve uses the back-suction force generated by air pressure to pull the needle back at the end of dispensing, trying to stop the outflow of glue. However, in actual operation, this method is often difficult to accurately control the size and timing of the back-suction force. When the back-suction force is insufficient, the glue cannot stop flowing out in time, resulting in excess glue accumulation at the tail of the glue dot, forming a "big head at the tail"; when the back-suction force is too large, part of the glue that has been squeezed out may be sucked back, affecting the integrity and shape of the glue dot, and also failing to meet the requirements of high-quality dispensing.

[0006] Whether it is an ejection-type or a suction-type striker dispensing valve, the "big head" problem is always difficult to be perfectly solved during the dispensing process. This problem not only limits the application of pneumatic dispensing technology in fields with extremely high requirements for glue point accuracy (such as the packaging of high-precision electronic components, the manufacture of tiny biomedical devices, etc.), but also increases production costs because additional processes are required to deal with defective products caused by the "big head" problem. In addition, in order to minimize the impact of the "big head" problem, operators often need to spend more time and energy to adjust the dispensing parameters, which also reduces production efficiency.

[0007] Therefore, developing a new pneumatic dispensing technology that can effectively overcome the "big and small heads" problem is of great practical significance for improving dispensing quality, reducing production costs, and improving production efficiency. It is also a technical problem that needs to be urgently solved in this field. Summary of the invention

[0008] The object of the present invention is to provide a rotary dispensing valve to overcome at least one of the above-mentioned defects in the prior art.

[0009] To achieve this object, the present invention adopts the following technical solutions: The present invention provides a rotary dispensing valve, comprising 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, 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 inside of the main valve body, the blade is located in the chamber, a first limit block and a second limit block for limiting the rotation of the blade are fixed in the chamber, the first limit block, the second limit block, and the first rotating shaft divide the chamber into a first chamber and a second chamber, a gap is provided between the second limit block and the inner wall of the main valve body for gas to flow in the first chamber and the second chamber, the first air port is connected to the first chamber, the second air port is connected to the second chamber, the lower part of the main valve body is connected to the 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 connected to the glue inlet channel, the bottom of the main valve body has a glue outlet, and the glue outlet channel is connected to the glue outlet.

[0010] Preferably, 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.

[0011] Preferably, the blade has a mounting groove, which extends from the upper side wall of the blade to the outer side wall and the lower side wall of the blade.

[0012] 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.

[0013] Preferably, 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.

[0014] Preferably, 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.

[0015] Preferably, the second shaft outer sleeve is provided with a ceramic bushing, and the side wall of the ceramic bushing has a connecting channel connecting the glue inlet and the glue inlet channel.

[0016] 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.

[0017] Preferably, the glue outlet component includes a joint body and a nut. The joint body is connected to the bottom of the main valve body. The nut is screwed to the joint 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 joint body connects the glue guide channel and the glue outlet.

[0018] 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.

[0019] The beneficial effects of the present invention are: 1. Through forward and reverse blowing, the glue is switched between flowing and stopping in a rotating 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.

[0020] 2. Through the design of combining the first rotating shaft with the second rotating shaft, the double rotating shaft structure can better disperse the force, reduce the vibration and deviation caused by rotation, and thus improve the stability and accuracy of dispensing.

[0021] 3. The first rotating shaft is driven to rotate by blowing the blades, thereby causing the second rotating shaft to rotate. This driving method is relatively simple and does not require complex air path layout, thus reducing the overall complexity and cost of the equipment.

[0022] 4. The arrangement of the first groove and the second groove allows the blade to be pushed more smoothly.

[0023] 5. Through the setting of the ceramic bushing, a stable support is provided for the second rotating shaft, the position accuracy of the second rotating shaft during the rotation process is ensured, the radial or axial movement of the second rotating shaft is prevented, the stability of the rotational motion is ensured, and the uniformity of the glue discharge and glue cutting is ensured.

[0024] 6. The glue guide channel acts as a buffer for the glue, which makes the flow rate and pressure of the glue more stable during the dispensing process, ensuring that the glue flows out in a relatively uniform state at the beginning, middle or end of the dispensing process. This makes the size, shape and amount of glue of each dispensing point more consistent, improves the overall quality and consistency of the product, reduces the product quality differences caused by the problem of dispensing size, and is conducive to quality control in large-scale production. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a main structural schematic diagram of the present invention.

[0026] Figure 2 It is a three-dimensional structural schematic diagram of the present invention.

[0027] Figure 3 It is a schematic diagram of the three-dimensional explosion structure of the upper part of the present invention.

[0028] Figure 4 It is a partial main structural schematic diagram of the upper part of the present invention.

[0029] Figure 5 yes Figure 4 Schematic diagram of the cross-sectional structure in the middle AA direction (glue dispensing is on).

[0030] Figure 6 yes Figure 4 Schematic diagram of the cross-sectional structure in the middle AA direction (glue dispensing closed state).

[0031] Figure 7 It is a schematic diagram of the three-dimensional structure of the blade and the first rotating shaft of the present invention.

[0032] Figure 8 It is a schematic diagram of the three-dimensional structure of the first limiting block of the present invention.

[0033] Fig. 9 It is a partial three-dimensional exploded structural schematic diagram of the present invention.

[0034] Fig.10 It is a schematic diagram of the main structure of the lower main valve body, the second rotating shaft, and the ceramic bushing of the present invention.

[0035] Fig.11 yes Fig.10 Schematic diagram of the cross-sectional structure along the BB axis.

[0036] Fig.12 It is a schematic diagram of the top view of the lower part of the present invention.

[0037] Fig.13 yes Fig.12 Schematic diagram of the CC section structure.

[0038] The markings 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 sealing member, 18-fourth sealing member, 111-joint body, 112-nut, 19-glue guide channel, 1121-glue outlet, 20-mounting block, 21-coupling, 22-gap. DETAILED DESCRIPTION

[0039] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0040] 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 orientation or position relationship indicated by the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0041] 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. A plurality of 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, the first rotating shaft 6 is fixed with a blade 8, a chamber is provided above the inside of the main valve body 1, the blade 8 is located in the chamber, and 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, the second limit block 5 The 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 flow in the first chamber 12 and the second chamber 13. The first gas port 2 is connected to the first chamber 12, and the second gas 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, the side wall of the second rotating shaft 9 has a glue inlet channel 91, and 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.

[0042] When discharging glue, air is blown into the first cavity 12 through the first air port 2, pushing the blade 8 to rotate, causing the first rotating shaft 6 to rotate, driving the second rotating shaft 9 to rotate, causing the glue inlet channel 91 to rotate to be arranged opposite to the glue inlet 10, and the glue enters the glue outlet channel 92 through the glue inlet 10 via the glue inlet channel 91, and finally discharges the glue through the glue outlet 11. The blade 8 pushes the gas in the first cavity 12 into the second cavity 13 through the gap 22, and discharges it through the second air port 3. When it is not necessary to discharge glue, air is blown into the second cavity 13 through the second air port 3, pushing the reverse blade 8 to rotate, causing the first rotating shaft 6 to rotate in the reverse direction, driving the second rotating shaft 9 to rotate in the reverse direction, causing the glue inlet channel 91 to stagger with the glue inlet 10, and cutting off the glue supply. In this way, by blowing air forward and backward, the glue is switched between flowing and stopping in a rotating shearing manner. There is no impact in this process, which can perfectly solve the problem of large and small heads. And through the design of the first rotating shaft 6 combined with the second rotating shaft 9, the double rotating shaft structure can better disperse the force, reduce the vibration and offset caused by rotation, so as to improve the stability and accuracy of glue dispensing. Furthermore, by blowing the blade 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, does not require a complex air path arrangement, and reduces the overall complexity and cost of the equipment. In addition, by flexibly adjusting the wind force and angle of the blowing blade 8, the rotation speed and angle of the double rotating shaft can be accurately controlled, so as to achieve 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, which effectively solves the problem of glue dispensing size head. 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 inlet channel 91 is just opposite to the glue inlet 10.

[0043] Among them, a first sealing member 14 is arranged between the upper side wall, the outer side wall, and the lower side wall of the blade 8 and the inner wall of the main valve body 1. The first sealing member 14 of this embodiment is a sealing strip. The blade 8 has a mounting groove 81, and the mounting groove 81 extends from the upper side wall of the blade 8 to the outer side wall and the lower side wall of the blade 8. The first sealing member 14 plays a sealing role to ensure the pushing effect of the airflow on the blade 8.

[0044] The first stopper 4 has a plurality of first grooves 41 and a second groove 42, wherein the first groove 41 is connected to the first cavity 12, and the second groove 42 is connected to the second cavity 13. The plurality of first grooves 41 and the plurality of second grooves 42 are evenly spaced along the height direction of the first stopper 4. The first groove 41 is provided so that the airflow entering the first cavity 12 through the first air port 2 is more evenly distributed. The second groove 42 is provided so that the airflow entering the second cavity 13 through the second air port 3 is more evenly distributed. Thus, the blade 8 is pushed more smoothly.

[0045] Among them, a second sealing member 15 is provided between the first rotating shaft 6 and the main valve body 1 at the upper and lower sides of the chamber. The second sealing member 15 of this embodiment is an O-ring. The second sealing member 15 plays a sealing role to prevent the gas in the chamber from leaking out through the first rotating shaft 6 and the main valve body 1, thereby ensuring the sealing of the chamber, further ensuring the smooth and uniform rotation of the blade 8, and making the first rotating shaft 6 rotate smoothly and uniformly, thereby ensuring the uniformity of the glue discharge and glue cutting.

[0046] The outer sleeve of the second rotating shaft 9 is provided with a ceramic bushing 16, and the side wall of the ceramic bushing 16 has a connecting channel 161 connecting the glue inlet 10 and the glue inlet channel 91. The ceramic bushing 16 is provided to provide stable support for the second rotating shaft 9, ensure the position accuracy of the second rotating shaft 9 during the rotation process, prevent the second rotating shaft 9 from radial or axial movement, ensure the stability of the rotation movement, and further ensure the uniformity of glue discharge and glue cutting.

[0047] Among them, a third sealing member 17 is provided between the second rotating shaft 9 and the ceramic bushing 16 on the upper and lower sides of the connecting channel 161, and a fourth sealing member 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. The third sealing member 17 of this embodiment is an O-ring, and the fourth sealing member 18 is a shaft seal, both of which play a sealing role to prevent leakage of the glue.

[0048] 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. The nut 112 is screwed to the connector body 111. The bottom of the main valve body 1 has a glue guide channel 19. The nut 112 is provided with a glue outlet 1121. The glue outlet channel 92 is connected to the glue guide channel 19. The connector body 111 is connected to the glue guide channel 19 and the glue outlet 1121. The glue guide channel 19 plays a buffering role on the glue. The glue guide channel 19 makes the flow rate and pressure of the glue more stable during the glue dispensing process. Whether it is 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 size head, and is conducive to quality control in large-scale production.

[0049] 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 embodiments of the present invention.

Claims

1. A rotary dispensing valve, characterized in that: 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; The main valve body has a chamber above its interior, the blade is located in the chamber, and a first limit block and a second limit block for limiting the rotation of the blade are fixed in the chamber; The first limiting block, the second limiting block, and the first rotating shaft divide the chamber into a first chamber and a second chamber; 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 with 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 with 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 arranged 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 extending 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 second grooves, 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 sleeve is provided with a ceramic bushing; The side wall of the ceramic bushing has a connecting channel connecting 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 joint 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.

Images