Dispensing valve and method

Abstract

The application relates to the field of circuit board assembling equipment, in particular to a glue dispensing valve and a glue dispensing method, wherein the glue dispensing valve comprises a total driving assembly, a glue dispensing driving assembly, a glue extruding driving assembly, a glue outlet assembly and a glue supply pipe barrel; the glue dispensing driving assembly comprises a glue dispensing punch pin; the glue extruding driving assembly comprises a glue extruding punch pin, a pump oil cavity, an oil tank and a hydraulic cylinder, a pump oil piston in the pump oil cavity is connected with the glue extruding punch pin, the oil tank is connected with the hydraulic cylinder through the pump oil cavity, and a hydraulic cylinder telescopic rod is connected with a glue extruding piston arranged in the glue supply pipe barrel; the glue outlet assembly comprises a glue material containing cavity and a glue outlet, the glue supply pipe barrel is connected with the glue material containing cavity, and one end of the glue dispensing punch pin arranged in the glue material containing cavity is connected with a glue dispensing piston; the total driving assembly comprises two groups of driving punch pins and a driving unit, one group of the driving punch pins can impact the glue dispensing punch pin, the other group of the driving punch pins can impact the glue extruding punch pin, and the amount of glue pumped out of the glue material containing cavity and the amount of oil pumped out of the hydraulic cylinder are consistent each time. The application has the effect of stable glue outlet amount.

Description

Technical Field

[0001] This application belongs to the field of circuit board assembly equipment, and in particular relates to a dispensing valve and a dispensing method. Background Technology

[0002] In the process of surface mount technology (SMT) assembly in circuit board manufacturing, red glue is usually used to fix the SMT components in order to prevent them from falling off during the secondary reflow of the circuit board.

[0003] Dispensing equipment is usually required when dispensing glue, and the dispensing valve is a key component of the dispensing equipment.

[0004] In existing dispensing valves, the glue supply is usually continuous while the glue dispensing is intermittent. As a result, the internal pressure of the glue in the dispensing valve will intermittently increase and decrease, which can easily lead to unstable glue dispensing. This can cause the glue amount on both sides of the surface mount component to be different, resulting in the surface mount component tilting or even shifting after soldering, thus reducing production quality.

[0005] Therefore, there is a need to provide a dispensing valve. Summary of the Invention

[0006] To improve upon the aforementioned deficiencies, this application provides a dispensing valve.

[0007] The dispensing valve provided in this application adopts the following technical solution.

[0008] A dispensing valve includes a main drive assembly, a dispensing drive assembly, an extrusion drive assembly, a dispensing assembly, and a supply assembly. The dispensing drive assembly includes a dispensing striker; the supply assembly includes a supply tubing; the extrusion drive assembly includes an extrusion striker, a pump chamber, an oil tank, and a hydraulic cylinder. The pump chamber has a pump piston connected to the extrusion striker. The oil tank is connected to the pump chamber, and the pump chamber is also connected to the hydraulic cylinder to pump hydraulic oil into the hydraulic cylinder. The hydraulic cylinder includes a telescopic rod and an extrusion piston that can be placed inside the supply tubing. The dispensing assembly... The assembly includes a glue receiving chamber and a glue outlet. The glue supply tank is connected to the glue receiving chamber via a glue supply pipe. One end of the dispensing pin, which is placed inside the glue receiving chamber, is connected to a dispensing piston. The main drive assembly includes two sets of drive pins and drive units. One set of drive units can drive the drive pin to strike the dispensing pin, and the other set of drive units can drive the drive pin to strike the extrusion pin. The amount of glue pumped out by the dispensing pin and the dispensing piston is the same as the amount of hydraulic oil pumped out by the extrusion pin and the oil pumping piston.

[0009] By adopting the above technical solution, each drive unit and drive pin can form a set of drive components, so that the extrusion pin and the dispensing pin have their own corresponding drive components, thereby realizing individual control of dispensing and extrusion (supplying glue to the dispensing component) and active glue supply. Since the amount of glue pumped out by the dispensing pin driving the dispensing piston is consistent with the amount of hydraulic oil pumped out by the extrusion pin driving the oil pumping piston, the amount of glue used for each dispensing can be consistent with the amount of glue supplied to the dispensing component each time, thereby stabilizing the pressure in the glue receiving cavity of the dispensing component and thus stabilizing the dispensing amount.

[0010] Specifically, when one set of driving units drives the driving pin to strike the dispensing pin, the other set of driving units drives the driving pin away from the extrusion pin; and when one set of driving units drives the driving pin away from the dispensing pin, the other set of driving units drives the driving pin to strike the extrusion pin.

[0011] By adopting the above technical solution, during the process of the driving striker hitting the dispensing striker, which in turn drives the dispensing piston to push the adhesive out of the adhesive receiving cavity for dispensing, another set of driving strikers moves away from the extrusion striker, thus preventing the supply of adhesive into the adhesive receiving cavity and avoiding an abnormal increase in the dispensing volume. Furthermore, during the process of the driving striker moving away from the dispensing striker, causing the dispensing piston to reset, the other set of driving strikers will hit the extrusion striker. This extrusion striker drives the oil pump piston to pump oil into the hydraulic cylinder, and ultimately, the hydraulic cylinder drives the extrusion piston to move, thus supplying adhesive into the adhesive receiving cavity. This ensures that the adhesive supplied to the adhesive receiving cavity precisely fills the space formed in the adhesive receiving cavity after the dispensing piston resets, ensuring that the dispensing volume is consistent with the previous dispensing volume, resulting in a more stable dispensing volume.

[0012] Specifically, the driving unit includes a cylinder, which has a firing pin receiving cavity suitable for accommodating the driving firing pin. One end of the firing pin receiving cavity is provided with a stroke adjusting bolt, and the other end is provided with a through hole structure suitable for the driving firing pin to pass through. A pre-compression spring is provided between the stroke adjusting bolt and the driving firing pin. An air inlet is provided on the side wall of the firing pin receiving cavity near the end where the through hole structure is located. The cylinder is connected to a high-pressure air source through the air inlet so that when the high-pressure air source supplies air to the firing pin receiving cavity, the driving firing pin moves toward the stroke adjusting bolt. When the high-pressure air source does not supply air to the firing pin receiving cavity, the driving firing pin can move toward the through hole structure under the drive of the driving firing pin, thereby impacting the extrusion firing pin and the dispensing firing pin.

[0013] By adopting the above technical solution, the amount of glue dispensing can be adjusted, and the reciprocating movement of the driving pin can be achieved by spring drive and pneumatic reset, making the impact of the driving pin on the extrusion pin and the dispensing pin more stable and reliable.

[0014] Furthermore, the driving striker is provided with a striker piston at one end within the striker receiving cavity. The striker piston includes a large-diameter section and a small-diameter section, which can abut against the pre-compression spring via the large-diameter section and abut against the end face of the through hole structure in the striker receiving cavity via the small-diameter section. A sealing element is provided between the large-diameter section of the piston and the side wall of the striker receiving cavity. An air intake cavity is formed between the large-diameter section of the piston and the end face of the through hole, and the air inlet is connected to the air intake cavity.

[0015] By adopting the above technical solution, it is possible to drive the movement of the impact pin with a high-pressure gas source without gas leakage, thus ensuring the reliability of the high-pressure gas source drive.

[0016] Specifically, the through-hole structure includes a small-diameter section and a large-diameter section, wherein a guide sleeve is provided in the large-diameter section and a sealing groove suitable for installing a sealing element is provided in the small-diameter section.

[0017] By adopting the above technical solution, it is possible to ensure that the driving striker does not tilt during its movement and to ensure the air intake chamber is sealed, thereby enabling the high-pressure air source to drive the movement and thus ensuring the reliability and stability of the driving striker.

[0018] Furthermore, a rubber extrusion rebound spring is provided between the rubber extrusion striker and the pump oil chamber, a one-way valve is provided between the oil tank and the pump oil chamber, and a one-way valve is provided between the pump oil chamber and the hydraulic cylinder, so that the hydraulic oil in the oil tank can only flow sequentially through the pump oil chamber to the hydraulic cylinder; the hydraulic cylinder is also provided with a pressure relief pipeline connected to the oil tank, and an on / off valve is provided in the pressure relief pipeline.

[0019] By adopting the above technical solution, during the rebound of the extrusion pin, only the hydraulic oil in the oil tank flows into the pump oil chamber, while the hydraulic oil already pumped into the hydraulic cylinder will not flow back into the pump oil chamber. This ensures that the position of the extrusion piston does not change, and thus ensures that the amount of glue supplied to the glue receiving chamber in the next cycle is consistent with the previous cycle, resulting in better glue supply stability.

[0020] Furthermore, a dispensing rebound spring is provided between the adhesive receiving cavity and the dispensing needle, and a one-way valve is provided between the adhesive supply pipe and the adhesive receiving cavity, so that the adhesive in the adhesive supply pipe can only flow from the adhesive supply pipe to the adhesive receiving cavity.

[0021] By adopting the above technical solution, the adhesive in the adhesive receiving cavity will not flow back into the adhesive supply tube during the dispensing process, thus making the dispensing volume more stable.

[0022] Furthermore, the outlet is provided with a rigid mesh plate and an elastic valve. The rigid mesh plate is located on the side close to the adhesive receiving cavity, and the elastic valve is located on the side away from the adhesive receiving cavity. When the elastic valve bends and deforms into the adhesive receiving cavity, it can abut against the rigid mesh plate.

[0023] By adopting the above technical solution, during the dispensing process when the dispensing piston moves towards the dispensing port, the adhesive will pass through the rigid mesh plate and the elastic valve in sequence. The elastic valve will bend and deform away from the adhesive receiving cavity to form an opening that allows the adhesive to pass through. As the dispensing piston moves away from the dispensing port, a negative pressure will be formed in the adhesive receiving cavity, causing the elastic valve to bend and deform into the adhesive receiving cavity until it adheres to the rigid mesh plate and seals all the holes on the rigid mesh plate, thus achieving the clamping of the adhesive. This can reduce the occurrence of adhesive stringing and other issues, thereby ensuring the stability of the dispensing volume.

[0024] Furthermore, a tube support is also connected to the cylinder, the tube support includes a retaining ring and a limiting bolt, and the retaining ring is provided with an internal thread hole that matches the limiting bolt.

[0025] By adopting the above technical solution, it is possible to install and fix glue supply hoses of different specifications.

[0026] This application also provides a dispensing method, which adopts the following technical solution.

[0027] A dispensing method includes the following steps:

[0028] Determine the dispensing line: The area on the circuit board substrate where electronic components need to be mounted is called the mounting area. If the electronic components exactly cover the mounting area, then the outline of the mounting area is called the dispensing line.

[0029] Dispensing: A dispensing machine is used to dispense several discontinuous dots of liquid red glue onto the dispensing line, with a portion of the liquid red glue located inside the mounting area and another portion located outside the mounting area. The dispensing machine includes a dispensing valve, which is the dispensing valve described in the above technical solution.

[0030] By adopting the above technical solution, during the soldering process of electronic components, the liquid red glue located on the dispensing line will solidify to support and limit the electronic components, making it difficult for the electronic components to shift. Furthermore, if there are electronic components mounted on both sides of the circuit board, it can ensure that when soldering electronic components on the other side, the electronic components on the already soldered side will not fall off.

[0031] In summary, this application includes at least one of the following beneficial technical effects:

[0032] 1. Two sets of drive units and drive pins can separately drive and control the extrusion pin and the dispensing pin, thereby achieving individual control of dispensing and extrusion (supplying glue to the dispensing assembly), as well as active glue supply. Since the amount of glue pumped by the dispensing pin driving the dispensing piston is consistent with the amount of hydraulic oil pumped by the extrusion pin driving the pumping piston, the amount of glue used in each dispensing operation is consistent with the amount of glue supplied to the dispensing assembly each time. Furthermore, during the process where the drive pin strikes the dispensing pin, causing the dispensing pin to drive the dispensing piston to push the glue out of the glue receiving cavity for dispensing, the other set of drive units... The driving pin moves away from the extrusion pin, thus preventing the supply of adhesive to the adhesive receiving cavity. While the driving pin moves away from the dispensing pin, causing the dispensing pin to reset the dispensing piston, another set of driving pins will strike the extrusion pin. This causes the extrusion pin to drive the oil pumping piston to pump oil into the hydraulic cylinder. Finally, the hydraulic cylinder drives the extrusion piston to move, thus supplying adhesive to the adhesive receiving cavity. This ensures that the adhesive supplied to the adhesive receiving cavity fills the space formed in the adhesive receiving cavity after the dispensing piston resets, keeping the pressure in the adhesive receiving cavity stable and thus making the dispensing volume more stable.

[0033] 2. Electronic components are less likely to shift during the soldering process. Furthermore, if electronic components are mounted on both sides of the circuit board, it can be ensured that the electronic components on the already soldered side will not fall off when soldering the electronic components on the other side. Attached Figure Description

[0034] Figure 1 This is a three-dimensional structural diagram of a high-efficiency cooling tower according to this application.

[0035] Figure 2 This is a side view of a high-efficiency cooling tower according to this application.

[0036] Figure 3 yes Figure 2 A cross-sectional view along the AA direction.

[0037] Figure 4 yes Figure 2 Cross-sectional view along the BB direction.

[0038] Figure 5 yes Figure 3 A magnified view of region C in the middle.

[0039] Figure 6 yes Figure 5 A cross-sectional view along the DD direction.

[0040] Figure 7 yes Figure 5 A cross-sectional view along the EE direction.

[0041] Reference numerals: 11. Drive pin; 111. Pin piston; 1111. Piston large diameter section; 1112. Piston small diameter section; 12. Drive unit; 121. Cylinder; 1211. Stroke adjusting bolt; 1212. Pre-compression spring; 1213. Air inlet; 1214. Guide sleeve; 21. Dispensing pin; 22. Dispensing piston; 23. Dispensing rebound spring; 31. Extrusion pin; 32. Pump oil chamber; 321. Pump oil piston; 33. Oil tank; 34. Hydraulic cylinder; 341. Telescopic rod; 342. Extrusion piston; 35. Extrusion rebound spring; 41. Glue material receiving chamber; 42. Glue outlet; 43. Rigid mesh plate; 44. Elastic valve; 5. Glue supply pipe; 6. Glue supply pipe; 71. Snap ring; 72. Limit bolt. Detailed Implementation

[0042] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0043] This application discloses a dispensing valve.

[0044] Reference Figure 1 and Figure 2 A dispensing valve includes a main drive assembly, a dispensing drive assembly, an extrusion drive assembly, a dispensing assembly, and a supply assembly; wherein the dispensing drive assembly includes a dispensing pin 21; the supply assembly includes a supply tubing 5; and as shown... Figure 3 and Figure 4 As shown, the extrusion drive assembly includes an extrusion striker 31, an oil pump chamber 32, an oil tank 33, and a hydraulic cylinder 34. An oil pump piston 321 connected to the extrusion striker 31 is located in the oil pump chamber 32. The oil tank 33 is connected to the oil pump chamber 32, which is also connected to the hydraulic cylinder 34 to pump hydraulic oil into the hydraulic cylinder 34. The hydraulic cylinder 34 includes a telescopic rod 341 and an extrusion piston 342 that can be placed inside the glue supply tube 5. The glue dispensing assembly includes a glue receiving chamber 41 and a glue outlet 42. The glue supply tube 5 is connected to the glue receiving chamber 41 via a glue supply pipe 6. One end of the dispensing striker 21, located inside the glue receiving chamber 41, is connected to a dispensing piston 22.

[0045] The main drive assembly includes two sets of drive pins 11 and drive units 12. One set of drive units 12 can drive the corresponding drive pin 11 to strike the dispensing pin 21, and the other set of drive units 12 can drive the corresponding drive pin 11 to strike the extrusion pin 31. Specifically, when one set of drive units 12 drives the drive pin 11 to strike the dispensing pin 21, the other set of drive units 12 drives the drive pin 11 away from the extrusion pin 31. That is, during the process where the drive pin 11 strikes the dispensing pin 21, thereby causing the dispensing pin 21 to drive the dispensing piston 22 to push the adhesive out of the adhesive receiving cavity 41 for dispensing, the other set of drive pins 11 moves away from the extrusion pin 31, thus preventing the supply of adhesive to the adhesive receiving cavity 41. When one set of drive units 12 drives the drive pin 11 away from the dispensing pin 21, the other set of drive units 12 drives the drive pin 11 to strike the extrusion pin 31. The extrusion pin 31 drives the oil pumping piston 321 to pump oil into the hydraulic cylinder 34. Finally, the hydraulic cylinder 34 drives the extrusion piston 342 to move, thereby actively supplying glue into the glue receiving cavity 41. Since the amount of glue pumped by the dispensing pin 21 and the dispensing piston 22 is the same as the amount of hydraulic oil pumped by the extrusion pin 31 and the oil pumping piston 321, the glue supplied to the glue receiving cavity 41 can just fill the space formed in the glue receiving cavity 41 after the dispensing piston 22 is reset. This ensures that the amount of glue dispensed in the next operation is consistent with the previous operation, making the amount of glue dispensed more stable.

[0046] Specifically, refer to Figure 3 and Figure 4 In one embodiment of the dispensing valve of this application, the drive unit 12 may be configured to include a cylinder 121, and a needle receiving cavity suitable for accommodating the drive needle 11 is provided in the cylinder 121. One end of the needle receiving cavity is provided with a stroke adjustment bolt 1211, so that the stroke of the drive needle 11 can be adjusted by rotating the stroke adjustment bolt 1211, that is, the formation of the dispensing needle 21 and the extrusion needle 31 can be adjusted, thereby enabling the adjustment of the amount of dispensing and the amount of glue supplied in a single operation. The other end of the needle receiving cavity is provided with a through hole structure suitable for the drive needle 11 to pass through. A pre-compression spring 1212 is provided between the stroke adjustment bolt 1211 and the drive needle 11. Specifically, the drive needle 11 is configured such that one end of it placed in the needle receiving cavity is provided with a needle piston 111, and an air inlet 1213 is provided on the side wall of the needle receiving cavity near the end where the through hole structure is located.

[0047] The firing pin piston 111 can be specifically configured to include a large-diameter section 1111 and a small-diameter section 1112, so that it can abut against the pre-compression spring 1212 via the large-diameter section 1111, and abut against the end face of the through hole structure in the firing pin receiving cavity via the small-diameter section 1112. A sealing element is provided between the large-diameter section 1111 and the side wall of the firing pin receiving cavity, allowing an air intake chamber to be formed between the large-diameter section 1111 and the end face of the through hole. The through hole structure specifically includes a small-diameter section and a large-diameter section. A guide sleeve 1214 is provided in the large-diameter section, and a sealing groove suitable for installing the sealing element is provided in the small-diameter section, ensuring that the air intake chamber does not leak out, thereby ensuring the reliability of the high-pressure air source drive. The air inlet chamber is connected to the air inlet 1213 and is connected to the high-pressure air source through the air inlet 1213. When the high-pressure air source supplies air to the ejector pin receiving chamber, the ejector pin 11 is driven to move towards the stroke adjustment bolt 1211. When the high-pressure air source does not supply air to the ejector pin receiving chamber, the ejector pin 11 can move towards the through hole structure under the drive of the ejector pin 11, forming an impact on the extrusion ejector pin 31 or the dispensing ejector pin 21 to achieve dispensing or supplying glue. The reciprocating movement of the ejector pin 11 is achieved by spring drive and pneumatic reset, which makes the reset of the ejector pin 11 faster, thereby improving the dispensing speed and ensuring that the ejector pin 11 is not prone to tilting during the movement, making the reliability and stability of the movement of the ejector pin 11 higher.

[0048] Furthermore, referring to Figure 3 and Figure 4 In one embodiment of the dispensing valve of this application, a dispensing return spring 35 is provided between the dispensing pin 31 and the pumping chamber 32. When the driving pin 11 moves away from the dispensing pin 31, the dispensing pin 31 can be reset under the action of the dispensing return spring 35, which can then drive the pumping piston 321 in the pumping chamber 32 to reset, so as to draw the hydraulic oil in the oil tank 33 into the pumping chamber 32. When the driving pin 11 strikes the dispensing pin 31, the dispensing pin 31 drives the pumping piston 321 to pump the hydraulic oil in the pumping chamber 32 to the hydraulic cylinder 34, so as to drive the telescopic rod 341 to push the dispensing piston 342, so that the glue in the glue supply tube 5 can be supplied to the glue receiving cavity 41 to achieve glue supply.

[0049] It is important to note that a check valve (not shown in the figure) should be installed between the oil tank 33 and the pump oil chamber 32, and a check valve (not shown in the figure) should be installed between the pump oil chamber 32 and the hydraulic cylinder 34. This ensures that the hydraulic oil in the oil tank 33 can only flow sequentially through the pump oil chamber 32 to the hydraulic cylinder 34. As a result, during the rebound of the extrusion pin 31, only the hydraulic oil in the oil tank 33 will flow into the pump oil chamber 32, while the hydraulic oil already pumped into the hydraulic cylinder 34 will not flow back into the pump oil chamber 32. This ensures that the position of the extrusion piston 342 does not change, and thus ensures that the amount of glue supplied to the glue receiving chamber 41 in the next cycle is consistent with the previous cycle, resulting in better glue supply stability.

[0050] In addition, the hydraulic cylinder 34 is also equipped with a pressure relief pipeline (not shown in the figure) connected to the oil tank 33, and an on / off valve (not shown in the figure) is provided in the pressure relief pipeline. When the telescopic rod 341 in the hydraulic cylinder 34 has not reached its maximum stroke (or the rubber material in the rubber supply tube 5 has not been completely squeezed out), the on / off valve needs to be kept closed. When the telescopic rod 341 in the hydraulic cylinder 34 reaches its maximum stroke (or the rubber material in the rubber supply tube 5 has been completely squeezed out), the on / off valve is opened so that the hydraulic cylinder 34 can be connected to the oil tank 33 to relieve pressure, and the telescopic rod 341 can be manually retracted back to its original position.

[0051] Furthermore, referring to Figure 3 and Figure 4 In one embodiment of the dispensing valve of this application, a dispensing rebound spring 23 is provided between the adhesive receiving cavity 41 and the dispensing needle 21. When the driving needle 11 moves away from the dispensing needle 21, the dispensing needle 21 can be reset under the action of the dispensing rebound spring 23, thereby driving the dispensing piston 22 in the adhesive receiving cavity 41 to reset. When the driving needle 11 strikes the dispensing needle 21, the dispensing needle 21 drives the dispensing piston 22 to squeeze the adhesive in the adhesive receiving cavity 41 from the dispensing port to achieve dispensing. It should be noted that a one-way valve should be provided between the adhesive supply pipe 6 and the adhesive receiving cavity 41, so that the adhesive in the adhesive supply pipe 5 can only flow from the adhesive supply pipe 5 to the adhesive receiving cavity 41, so that the adhesive in the adhesive receiving cavity 41 will not flow back into the adhesive supply pipe 5 during the dispensing process, so as to make the dispensing volume more stable.

[0052] Furthermore, referring to Figure 5 In one embodiment of the dispensing valve of this application, a rigid mesh plate 43 and an elastic valve 44 may be provided at the dispensing port 42, wherein the rigid mesh plate 43 is provided on the side close to the adhesive receiving cavity 41, and the elastic valve 44 is provided on the side away from the adhesive receiving cavity 41, such as... Figure 6 and Figure 7As shown, the rigid stencil 43 has multiple perforated structures that allow adhesive to pass through. An elastic valve 44 abuts against the side of the rigid stencil 43 away from the adhesive receiving cavity 41 and is configured to cover all the perforated structures on the rigid stencil 43. Thus, during the dispensing process as the dispensing piston 22 moves towards the dispensing port 42, the adhesive will sequentially pass through the rigid stencil 43 and the elastic valve 44. The elastic valve 44 will bend and deform away from the adhesive receiving cavity 41 to form an opening that allows the adhesive to pass through. During the movement of the dispensing piston 22 away from the dispensing port 42, an opening will form within the adhesive receiving cavity 41. The negative pressure causes the elastic valve 44 to bend and deform into the adhesive receiving cavity 41, that is, to directly adhere to the rigid mesh plate 43, and to completely seal the hole structure on the rigid mesh plate 43, thereby achieving the clamping of the adhesive and preventing air from entering the adhesive receiving cavity 41, reducing the occurrence of adhesive stringing and other issues, and thus ensuring the stability of the dispensing volume. Of course, it is understandable that the check valve between the oil tank 33 and the pump oil chamber 32, the check valve between the pump oil chamber 32 and the hydraulic cylinder 34, and the check valve between the adhesive supply pipe 6 and the adhesive receiving cavity 41 can also adopt the structure of the rigid mesh plate 43 and the elastic valve 44 described above.

[0053] Furthermore, referring to Figure 2 and Figure 3 In one embodiment of the dispensing valve of this application, a tube support is also connected to the cylinder 121. The tube support can be configured to include a retaining ring 71 and a limiting bolt 72. The retaining ring 71 is provided with an internal threaded hole that matches the limiting bolt 72, so that the dispensing tubes 5 of different specifications can be installed and fixed through the cooperation between the limiting bolt 72 and the internal threaded hole.

[0054] This application also discloses a dispensing method.

[0055] A dispensing method includes the following steps:

[0056] Determine the dispensing line: The area on the circuit board substrate where electronic components need to be mounted is called the mounting area. If the electronic components cover the mounting area, the outline of the mounting area is called the dispensing line.

[0057] Dispensing: A dispensing machine is used to dispense several discontinuous dots of liquid red glue onto a dispensing line, with a portion of the liquid red glue located inside the mounting area and another portion located outside the mounting area. The dispensing machine includes a dispensing valve, which is the dispensing valve described in the above technical solution.

[0058] Taking a rectangular mounting area as an example, the dispensing line is also rectangular. If the length and width of the dispensing line are both less than or equal to 5mm, red glue can be applied to the mounting area corresponding to the dispensing line, or to the middle of the longer pair of sides of the dispensing line, with part of the liquid red glue located inside the mounting area and the other part located outside the mounting area. If the length and width of the dispensing line are both greater than 5mm, red glue can be applied to the middle of each side of the dispensing line, with part of the liquid red glue located inside the mounting area and the other part located outside the mounting area. The side surface of the adhesive allows the liquid red glue on the dispensing line to solidify during the soldering process, thus supporting the electronic components (ensuring the gap between the electronic components and the circuit board) and limiting their movement (the solidified red glue will abut against the side of the electronic components to create a limit). This prevents the electronic components from shifting, and if there are electronic components mounted on both sides of the circuit board, it ensures that when soldering components on the other side, the components on the already soldered side will not fall off, resulting in higher quality circuit boards.

[0059] The implementation principle of the dispensing valve in this embodiment is as follows: two sets of drive units 12 and drive pins 11 are set to drive and control the extrusion pin 31 and dispensing pin 21 respectively, thereby realizing separate control of dispensing and extrusion (supplying glue to the dispensing assembly) and realizing active glue supply; since the amount of glue pumped by the dispensing pin 21 driving the dispensing piston 22 is the same as the amount of hydraulic oil pumped by the extrusion pin 31 driving the oil pumping piston 321, the amount of glue used for each dispensing is consistent with the amount of glue supplied to the dispensing assembly each time. Furthermore, during the process where the drive pin 11 strikes the dispensing pin 21, thereby causing the dispensing pin 21 to drive the dispensing piston 22 to push the glue in the glue receiving cavity 41 for dispensing, the other set of drive units 12 and drive pins 11 are used to drive and control the dispensing pin 21 and dispensing pin 21 respectively. Since the ejector pin 11 is far away from the extrusion ejector pin 31, it will not supply glue to the glue receiving cavity 41. However, during the process of driving the ejector pin 11 away from the dispensing ejector pin 21, causing the dispensing ejector pin 21 to drive the dispensing piston 22 to reset, another set of drive ejector pins 11 will strike the extrusion ejector pin 31. This will drive the oil pumping piston 321 to pump oil into the hydraulic cylinder 34, and finally drive the extrusion piston 342 to move through the hydraulic cylinder 34 to supply glue to the glue receiving cavity 41. Therefore, the glue supplied to the glue receiving cavity 41 can just fill the space formed in the glue receiving cavity 41 after the dispensing piston 22 resets, so that the pressure in the glue receiving cavity 41 can remain stable, thereby making the glue dispensing amount more stable.

[0060] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A dispensing valve, characterized by, This includes the main drive assembly, dispensing drive assembly, extrusion drive assembly, dispensing assembly, and glue supply assembly; The dispensing drive assembly includes a dispensing ejector pin (21). The glue supply assembly includes a glue supply tubing (5); The extrusion drive assembly includes an extrusion striker (31), an oil pump chamber (32), an oil tank (33), and a hydraulic cylinder (34). The oil pump chamber (32) is provided with an oil pump piston (321) connected to the extrusion striker (31). The oil tank (33) is connected to the oil pump chamber (32). The oil pump chamber (32) is also connected to the hydraulic cylinder (34) so ​​as to pump hydraulic oil into the hydraulic cylinder (34). The hydraulic cylinder (34) includes a telescopic rod (341) and an extrusion piston (342) that can be placed in the glue supply tube (5). The dispensing assembly includes a glue receiving cavity (41) and a glue outlet (42). The glue supply tube (3) is connected to the glue receiving cavity (41) through a glue supply pipe (6). The dispensing needle (21) is placed inside the glue receiving cavity (41) and connected to a dispensing piston (22). The overall drive assembly includes two sets of drive pins (11) and drive units (12). One set of drive units (12) can drive the drive pins (11) to strike the dispensing pin (21), and the other set of drive units (12) can drive the drive pins (11) to strike the extrusion pin (31). The amount of glue pumped by the dispensing pin (21) driving the dispensing piston (22) is the same as the amount of hydraulic oil pumped by the extrusion pin (31) driving the oil pumping piston (321). When one set of driving units (12) drives the driving pin (11) to strike the dispensing pin (21), the other set of driving units (12) drives the driving pin (11) away from the extrusion pin (31); and when one set of driving units (12) drives the driving pin (11) away from the dispensing pin (21), the other set of driving units (12) drives the driving pin (11) to strike the extrusion pin (31). The drive unit (12) includes a cylinder (121), which has a striker receiving cavity suitable for accommodating the drive striker (11). One end of the striker receiving cavity is provided with a stroke adjusting bolt (1211), and the other end is provided with a through hole structure suitable for the drive striker (11) to pass through. A pre-compression spring (1212) is provided between the stroke adjusting bolt (1211) and the drive striker (11). An air inlet is provided on the side wall of the striker receiving cavity near the end where the through hole structure is located. (1213) The cylinder (121) is connected to a high-pressure air source via the air inlet (1213) so that when the high-pressure air source supplies air to the firing pin receiving cavity, the driving firing pin (11) moves to the stroke adjusting bolt (1211) and when the high-pressure air source does not supply air to the firing pin receiving cavity, the driving firing pin (11) can move to the through hole structure under the drive of the driving firing pin (11) to form an impact on the extrusion firing pin (31) and the dispensing firing pin (21); The driving striker (11) is provided with a striker piston (111) at one end placed in the striker receiving cavity. The striker piston (111) includes a piston large diameter section (1111) and a piston small diameter section (1112) so that it can abut against the pre-compression spring (1212) through the piston large diameter section (1111) and abut against the end face of the through hole structure in the striker receiving cavity through the piston small diameter section (1112). A sealing element is provided between the piston large diameter section (1111) and the side wall of the striker receiving cavity. An air inlet cavity is formed between the piston large diameter section (1111) and the end face of the through hole. The air inlet (1213) is connected to the air inlet cavity.

2. The valve of claim 1, wherein: The through-hole structure includes a small-diameter section and a large-diameter section. The large-diameter section is provided with a guide sleeve (1214), and the small-diameter section is provided with a sealing groove suitable for installing a seal.

3. The valve of claim 2, wherein: A rubber extrusion rebound spring (35) is provided between the rubber extrusion striker (31) and the oil pump chamber (32). A one-way valve is provided between the oil tank (33) and the oil pump chamber (32). A one-way valve is provided between the oil pump chamber (32) and the hydraulic cylinder (34), so that the hydraulic oil in the oil tank (33) can only flow sequentially through the oil pump chamber (32) to the hydraulic cylinder (34). The hydraulic cylinder (34) is also provided with a pressure relief pipeline (36) connected to the oil tank (33), and an on / off valve is provided in the pressure relief pipeline (36).

4. The valve of claim 3, wherein: A dispensing rebound spring (23) is provided between the adhesive receiving cavity (41) and the dispensing needle (21), and a one-way valve is provided between the adhesive supply pipe (6) and the adhesive receiving cavity (41), so that the adhesive in the adhesive supply pipe (5) can only flow from the adhesive supply pipe (5) to the adhesive receiving cavity (41).

5. A valve according to claim 4, wherein: The outlet (42) is provided with a rigid mesh plate (43) and an elastic valve (44). The rigid mesh plate (43) is located on the side close to the adhesive receiving cavity (41), and the elastic valve (44) is located on the side away from the adhesive receiving cavity (41). When the elastic valve (44) bends and deforms into the adhesive receiving cavity (41), it can abut against the rigid mesh plate (43).

6. A valve according to claim 5, wherein: The cylinder (121) is also connected to a pipe support, which includes a retaining ring (71) and a limiting bolt (72). The retaining ring (71) has an internal thread hole that matches the limiting bolt (72).

7. A method of dispensing, comprising: Includes the following steps: Determine the dispensing line: The area on the circuit board substrate where electronic components need to be mounted is called the mounting area. If the electronic components exactly cover the mounting area, then the outline of the mounting area is called the dispensing line. Dispensing: A dispensing machine is used to dispense a number of discontinuous dots of liquid red glue onto the dispensing line, wherein a portion of the liquid red glue is located inside the mounting area and another portion is located outside the mounting area. The dispensing machine includes a dispensing valve, and the dispensing valve is the dispensing valve according to any one of claims 1 to 6.

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