Screw dispensing valve and dispensing screw

Abstract

This invention provides a screw dispensing valve and a dispensing screw. The screw dispensing valve is connected to a dispensing device and includes a valve body and the dispensing screw. The valve body has a glue supply channel, a glue storage chamber, and a glue dispensing channel connected in sequence. The dispensing screw is rotatably disposed in the valve body and passes through the glue storage chamber and the dispensing channel axially. The dispensing screw forms a threaded section located in the dispensing channel. The dispensing device supplies glue to the glue supply channel, which supplies the glue to the glue storage chamber and then axially enters the dispensing channel from the glue storage chamber. The rotating dispensing screw drives the glue in the dispensing channel through the threaded section and out through the dispensing nozzle of the dispensing channel. Therefore, the glue is not sheared by the threaded section when it is supplied to the dispensing channel, which can avoid changes in the material properties of the glue or failure to fill the threaded section, effectively improving the dispensing stability.

Description

Technical Field

[0001] This invention relates to a screw dispensing valve and its dispensing screw, particularly to a screw dispensing valve and its dispensing screw that are connected to dispensing equipment and used in the bonding process of semiconductors, especially a dispensing valve used for micro-dispensing. Prior Technology

[0002] Screw dispensing valves are commonly used in dispensing equipment and applied in semiconductor bonding processes, especially for supplying highly viscous adhesives. As shown in Figures 7 and 8, a modern screw dispensing valve includes a valve body 30 and a dispensing screw 40. The valve body 30 has a dispensing channel 31 and a dispensing channel 32. The dispensing channel 31 is connected to the dispensing channel 32, and the dispensing channel 32 has a dispensing port. The dispensing screw 40 is mounted on the valve body 30 and can axially rotate through the dispensing channel 32. During the dispensing operation, the dispensing equipment controls the screw dispensing valve to supply the adhesive directly to the threaded section 41 of the dispensing screw 40 through the dispensing channel 31. The adhesive is then carried out to the dispensing port of the dispensing channel 32 by the rotation of the dispensing screw 40 for dispensing.

[0003] However, as shown in Figures 7 and 8, the glue supply channel 31 of the current screw dispensing valve is directly connected to the glue outlet channel 32, and the glue is directly supplied to the threaded section 41 of the glue supply screw 40. Therefore, when the glue supply screw 40 rotates, the glue will directly contact the rotating thread 411, causing the glue to be sheared by the thread 411, resulting in gaps in the glue that cannot fill the space between adjacent threads 411, which will affect the glue dispensing stability, especially when performing micro-dispensing, the impact on glue dispensing stability is even greater.

[0004] Furthermore, in order to improve the conductivity or heat dissipation of adhesives, there is now a composite adhesive, which is a composite material formed by adding metal or other material particles to a base adhesive. The particles are uniformly distributed in the base adhesive. However, when the composite adhesive is sheared by the screw thread 411, the particles in the adhesive may be squeezed and deformed or destroyed, which will affect the material properties of the composite adhesive and may cause the adhesive to settle and clump. This may not only cause blockage of the dispensing port, affecting the adhesive supply flow rate, but also affect the adhesive weight and reduce the stability of dispensing. Therefore, there is still room for improvement. Summary of the Invention

[0005] The main objective of this invention is to provide a screw dispensing valve and a dispensing screw, in order to improve the current screw dispensing valves that directly supply adhesive to the threaded section of the screw, causing the adhesive to be sheared when the screw rotates, resulting in low dispensing stability.

[0006] To achieve the aforementioned objective, the present invention provides a screw dispensing valve connected to a dispensing device, and includes: A valve body has a glue supply channel, a glue storage chamber, and a glue outlet channel sequentially connected. The glue supply channel is connected to the glue storage chamber through a glue outlet. The glue storage chamber is located at the top of the glue outlet channel, and a dispensing nozzle is formed at the bottom of the glue outlet channel. A dispensing device is connected to the valve body and can supply glue to the glue supply channel of the valve body, so that the glue enters the glue storage chamber through the glue outlet of the glue supply channel, and is then supplied axially from the glue storage chamber to the glue outlet channel; and A dispensing screw is rotatably disposed in the valve body and passes axially through the glue reservoir and the dispensing channel. The dispensing screw has an input section and a threaded section connected to each other. The input section is located in the glue reservoir, and the threaded section is located in the dispensing channel and has threads. The dispensing device can control the rotation of the dispensing screw to drive the glue in the dispensing channel to be discharged from the dispensing port of the dispensing channel.

[0007] The screw dispensing valve is connected to the dispensing equipment and supplies adhesive through the equipment. The adhesive enters the supply channel of the valve body and then enters the storage chamber through the outlet of the supply channel. After the storage chamber is filled, the adhesive enters the outlet channel and contacts the threaded section of the dispensing screw. The dispensing screw rotates, causing the adhesive to be discharged from the dispensing outlet of the outlet channel. Since the adhesive must fill the storage chamber before entering the outlet channel, and the adhesive enters the threaded section of the dispensing screw along the axial direction, the adhesive is directly filled onto the threads of the threaded section without being sheared by the threads. Therefore, it can avoid changes in the material properties of the adhesive, sedimentation, agglomeration, or failure to fill the threads properly caused by the threads shearing the adhesive, thereby improving the dispensing stability, especially when performing micro-dispensing, which can effectively improve the dispensing stability.

[0008] Furthermore, depending on the required glue dispensing volume, the dispensing screw can be replaced with a screw with a different thread pitch. Since the glue outlet of the glue supply channel supplies glue to the glue storage chamber, and then the glue storage chamber supplies glue to the dispensing channel, there is no need to replace the valve body of the glue supply channel with a different diameter according to the thread pitch of the dispensing screw, thus saving costs.

[0009] To achieve the aforementioned objective, the present invention further provides a dispensing screw rotatably disposed within a valve body of a screw dispensing valve, and comprising: An input section, located in a reservoir chamber of the valve body, and the input section being cylindrical; and A threaded section is located in one of the outlet channels of the valve body, and the threaded section has threads, wherein the diameter of the input section is less than or equal to the inner diameter of the threaded section; The adhesive material is supplied to the input section from one of the adhesive supply channels of the valve body to enter the adhesive storage chamber. After the adhesive storage chamber is filled, it enters the adhesive outlet channel. As the threaded section rotates, the adhesive material is driven by the thread, causing the adhesive material to move towards a point on the adhesive outlet channel and be discharged from that point.

[0010] By applying the dispensing screw in the screw dispensing valve, when the adhesive enters the storage chamber from the supply channel of the valve body, the adhesive will first contact the input section. After the adhesive fills the storage chamber and enters the dispensing channel, the threaded section of the dispensing screw located in the dispensing channel will drive the adhesive towards the dispensing port and discharge it. Therefore, the adhesive will not be sheared by the screw threads, thereby improving the dispensing stability. Simple Explanation of the Diagram

[0011] Figure 1: A partial front cross-sectional view of a preferred embodiment of the screw dispensing valve and dispensing screw of the present invention. Figure 2: A partially enlarged front cross-sectional view of one embodiment of the screw dispensing valve and dispensing screw of the present invention. Figure 3: A partially enlarged front cross-sectional view of another configuration of the screw dispensing valve and dispensing screw of the present invention. Figure 4: A partially enlarged side cross-sectional view of the screw dispensing valve and dispensing screw of the present invention. Figure 5: A three-dimensional schematic diagram of the AA cross section of Figure 1 of this invention. Figure 6: A partially enlarged top view of the AA section of Figure 1 of this invention. Figure 7: A partially enlarged front view sectional diagram of a conventional screw dispensing valve. Figure 8: A partially enlarged top view of a conventional screw dispensing valve. Implementation

[0012] Please refer to Figure 1, which shows a preferred embodiment of the screw dispensing valve provided by the present invention. The screw dispensing valve is connected to a dispensing device and includes a valve body 10 and a dispensing screw 20.

[0013] As shown in Figures 1 and 2, the valve body 10 has a glue supply channel 11, a glue storage chamber 12, and a glue outlet channel 13 connected in sequence. The glue supply channel 11 is connected to the glue storage chamber 12 through a glue outlet 111. The glue storage chamber 12 is located at the top of the glue outlet channel 13. A glue outlet 131 is formed at the bottom of the glue outlet channel 13. The glue dispensing device is connected to the valve body 10 and can supply glue to the glue supply channel 11 of the valve body 10, so that the glue enters the glue storage chamber 12 through the glue outlet 111 of the glue supply channel 11, and is then supplied axially from the glue storage chamber 12 to the glue outlet channel 13.

[0014] As shown in Figures 1 and 2, the dispensing screw 20 is rotatably disposed in the valve body 10 and passes axially through the glue reservoir 12 and the dispensing channel 13. The dispensing screw 20 has an input section 21 and a threaded section 22 connected to each other. The input section 21 is located in the glue reservoir 12, and the threaded section 22 is located in the dispensing channel 13. In some embodiments, the input section 21 may be a cylinder, preferably with a smooth outer wall, but this is not a limitation. The threaded section 22 has threads 221. The dispensing device can control the rotation of the dispensing screw 20 to drive the glue in the dispensing channel 13 out through the dispensing port 131 of the dispensing channel 13.

[0015] The screw dispensing valve is connected to the dispensing equipment and supplies adhesive through the dispensing equipment. The adhesive enters the glue supply channel 11 of the valve body 10 and enters the glue storage chamber 12 through the glue outlet 111 of the glue supply channel 11. After the glue fills the glue storage chamber 12, it enters the glue outlet 13 and contacts the threaded section 22 of the dispensing screw 20. The dispensing screw 20 rotates and drives the adhesive to be discharged from the dispensing port 131 of the dispensing channel 13.

[0016] Since the adhesive material must be filled in the glue storage chamber 12 before entering the glue outlet 13, the flow rate of the adhesive material entering the glue outlet 13 can be ensured to be stable. As shown in Figures 2, 5 and 6, the adhesive material enters the threaded section 22 of the glue dispensing screw 20 along the axial direction. Therefore, the adhesive material is directly filled in the gap between the thread 221 of the threaded section 22 and the glue outlet 13. Due to the rotation of the glue dispensing screw 20, the adhesive material is driven by the thread 221 of the threaded section 22 to move towards the glue outlet 131 and is discharged without being sheared by the thread 221. Therefore, it can avoid the material properties of the adhesive material being changed, sedimented, agglomerated or unable to be reliably filled between the thread 221 due to the shearing of the adhesive material by the thread 221. Furthermore, since the input section 21 is a cylinder without threads, regardless of the angle at which the dispensing screw 20 is rotated, the contact area between the adhesive supplied by the adhesive supply channel 11 through the dispensing port 111 and the adhesive storage chamber 12 is equal, and the contact area between the adhesive in the adhesive storage chamber 12 and the threaded section 22 of the dispensing screw 20 is also equal. Therefore, the cross-sectional area of ​​the adhesive supplied to the dispensing screw 20 can remain equal, thereby improving the dispensing stability. This is especially effective when performing micro-dispensing with a single dispensing amount between 0.1 mg and 5 mg, for example, when the dispensing amount is preferably between 0.5 mg and 1 mg or 1 mg and 2 mg.

[0017] Preferably, as shown in Figures 2 and 4, the height of the glue storage chamber 12 is greater than or equal to the diameter of the glue supply channel 11, and the range of the glue outlet 111 of the glue supply channel 11 overlaps with that of the glue storage chamber 12. This ensures that when the glue leaves the glue outlet 111 of the glue supply channel 11, it only enters the glue storage chamber 12 and does not prematurely enter the glue outlet 13. Furthermore, the top of the glue storage chamber 12 is higher than the top of the glue outlet 111 of the glue supply channel 11 to ensure that the glue is reliably supplied to the glue storage chamber 12.

[0018] Furthermore, as shown in Figures 2 and 4, the height of the top of the glue outlet 13 and the height of the top of the threaded section 22 of the glue outlet screw 20 are lower than or equal to the height of the bottom of the glue outlet 111 of the glue supply channel 11, thereby preventing the glue material in the glue storage chamber 12 from prematurely contacting the threaded section 22 of the glue outlet screw 20 and being sheared.

[0019] As shown in Figures 1 and 2, in one configuration of the screw dispensing valve, the diameter of the input section 21 of the dispensing screw 20 is equal to the inner diameter of the threaded section 22 of the dispensing screw 20. As shown in Figure 3, in another configuration of the screw dispensing valve, the diameter of the input section 21 of the dispensing screw 20 is smaller than the inner diameter of the threaded section 22 of the dispensing screw 20. Changing the diameter of the input section 21 of the dispensing screw 20 will change the volume of the glue storage chamber 12 and the area of ​​the connection between the glue storage chamber 12 and the glue channel 13. However, regardless of the diameter of the input section 21, as long as the area of ​​the connection between the glue storage chamber 12 and the glue channel 13 is greater than or equal to the area of ​​the top of the threaded section 22 of the dispensing screw 20 that can receive the glue material, it is acceptable.

[0020] Preferably, as shown in Figures 1 and 2, the width of the glue storage chamber 12 of the valve body 10 is equal to the width of the glue outlet 13. That is, when the through channel is formed inside the valve body 10, the glue storage chamber 12 and the glue outlet 13 of the valve body 10 are formed simultaneously. The glue storage chamber 12 of the valve body 10 is located between the through channel and the input section 21 of the glue outlet screw 20, while the glue outlet 13 of the valve body 10 is located between the through channel and the threaded section 22 of the glue outlet screw 20, thereby improving the convenience of processing and manufacturing.

[0021] Furthermore, as shown in Figure 1, the threads 221 of the threaded section 22 of the dispensing screw 20 are arranged at equal intervals to maintain a stable glue supply. In addition, depending on the required glue dispensing volume or speed, the dispensing screw 20 can be replaced with a screw with a threaded section 22 having a different pitch. Since the glue outlet 111 of the glue supply channel 11 supplies glue to the glue storage chamber 12, and then the glue storage chamber 12 supplies glue to the dispensing channel 13, it is not necessary to replace the valve body 10 of the glue supply channel 11 with one of a different diameter according to the pitch of the dispensing screw 20, thus saving costs.

[0022] Please refer to Figure 1, which shows a preferred embodiment of the dispensing screw 20 provided by the present invention. It is rotatably disposed in a valve body 10 of a screw dispensing valve and includes an input section 21 and a threaded section 22. The input section 21 is located in a glue storage chamber 12 of the valve body 10 and is cylindrical. The threaded section 22 is located in a glue outlet 13 of the valve body 10 and has threads 221. The diameter of the input section 21 is less than or equal to the inner diameter of the threaded section 22. Adhesive is supplied from a glue supply channel 11 of the valve body 10 to the input section 21 to enter the glue storage chamber 12. After filling the glue storage chamber 12, the adhesive enters the glue outlet 13. The rotation of the threaded section 22, driven by the threads 221, causes the adhesive to move towards a dispensing port 131 in the glue outlet 13 and be discharged from the dispensing port 131.

[0023] In summary, the valve body 10 of the screw dispensing valve has a glue supply channel 11, a glue storage chamber 12, and a glue outlet 13 connected in sequence. The glue is supplied from the glue supply channel 11 to the glue storage chamber 12, and then from the glue storage chamber 12 to the glue outlet 13. The glue is driven by the threaded section 22 of the dispensing screw 20 located in the glue outlet 13 and discharged from the dispensing port 131 of the glue outlet 13. Since the glue is supplied axially from the glue storage chamber 12 to the glue outlet 13 without being sheared by the threaded section 22 of the dispensing screw 20, the material properties of the glue are not changed or the glue cannot be reliably filled between the threads 221, thus effectively improving the glue dispensing stability of the screw dispensing valve.

[0024] 10: Valve body 11: Adhesive supply channel 111:Glue outlet 12: Glue Storage Room 13: Glue outlet 131: Glue Dispensing Point 20: Dispensing screw 21: Input segment 22: Threaded section 221: Threaded 30: Valve body 31: Adhesive supply channel 32: Glue outlet 40: Glue supply screw 41: Threaded section 411: Threaded

Claims

1. A screw dispensing valve connected to a dispensing device, comprising: a valve body having a glue supply channel, a glue reservoir, and a glue outlet sequentially connected, the glue supply channel being connected to the glue reservoir through a glue outlet, the glue reservoir being located at the top of the glue outlet, and a dispensing nozzle being formed at the bottom of the glue outlet; the width of the glue reservoir of the valve body being equal to the width of the glue outlet; the dispensing device being connected to the valve body and capable of supplying glue to the glue supply channel of the valve body, allowing the glue to enter the glue reservoir through the glue outlet of the glue supply channel, and then being axially supplied from the glue reservoir to the glue outlet; and a dispensing screw rotatably disposed in the valve body. The dispensing screw passes axially through the glue storage chamber and the glue outlet. The dispensing screw has an input section and a threaded section connected to each other. The input section is located in the glue storage chamber, and the threaded section is located in the glue outlet. The threaded section has threads. The dispensing device can control the rotation of the dispensing screw to drive the glue in the glue outlet to be discharged from the dispensing port of the glue outlet. The height position of the top of the glue outlet and the height position of the top of the threaded section of the dispensing screw are lower than or equal to the height position of the bottom of the glue outlet of the glue supply channel. The input section of the dispensing screw is a cylinder.

2. The screw dispensing valve as described in claim 1, wherein the height of the glue reservoir is greater than or equal to the diameter of the glue supply channel, and the range of the glue outlet of the glue supply channel overlaps with the glue reservoir.

3. The screw dispensing valve as described in claim 2, wherein the top of the glue reservoir is higher than the top of the glue outlet of the glue supply channel.

4. The screw dispensing valve as described in any one of claims 1 to 3, wherein the diameter of the input section of the dispensing screw is less than or equal to the inner diameter of the threaded section of the dispensing screw.

5. The screw dispensing valve as described in any one of claims 1 to 3, wherein the threads of the threaded section of the dispensing screw are arranged at equal intervals.

6. A dispensing screw, rotatably disposed in a valve body of a screw dispensing valve, comprising: an input section located in a glue reservoir of the valve body, the input section being cylindrical; and a threaded section located in a dispensing channel of the valve body with a width equal to that of the glue reservoir, the threaded section having threads, wherein the diameter of the input section is less than or equal to the inner diameter of the threaded section; wherein, The height of the top of the dispensing channel of the valve body and the height of the top of the threaded section of the dispensing screw are lower than or equal to the height of the bottom of the dispensing port of one of the dispensing channels of the valve body. The adhesive is supplied from the dispensing channel of the valve body to the input section to enter the storage chamber, and after filling the storage chamber, it enters the dispensing channel. As a result, the adhesive is driven by the screw threads due to the rotation of the threaded section, causing the adhesive to move towards a dispensing port of the dispensing channel and be discharged from that port.

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