A precision point liquid device

Abstract

The utility model discloses a kind of precision point liquid equipment, including protractor, point liquid mechanism, visual inspection mechanism and control host computer, protractor includes carousel, multiple positioning units are provided on carousel, multiple positioning units sequentially pass loading station, point liquid station and visual inspection station;Point liquid mechanism includes point liquid support, lifting drive module, volumetric metering formula quantitative discharge valve, lifting drive module is set on the positioning unit above at point liquid station place by point liquid support, and metering formula quantitative discharge valve is driven along vertical direction reciprocating motion by lifting drive module;Visual inspection mechanism includes visual camera, visual camera is fixed on the positioning unit above at visual inspection station place. The precision point liquid equipment utilizes volumetric metering formula quantitative discharge valve to carry out accurate control to liquid discharge amount and is supplemented with visual inspection mechanism to carry out visual inspection to point liquid object, automatically realizes high-precision point liquid and the visual inspection of point liquid, and it is favorable to improve the work efficiency of point liquid operation.

Description

Technical Field

[0001] This utility model relates to the field of precision liquid dispensing, specifically to a precision liquid dispensing device. Background Technology

[0002] Currently available liquid dispensing equipment typically uses a pneumatic back-suction dispensing valve. Its working principle is to semi-automatically control the back-suction dispensing valve and then use a pneumatic or electric control valve to achieve liquid dispensing.

[0003] In practice, due to the working principle of semi-automatic back-suction dispensing valves, such dispensing systems are prone to problems such as large deviations in dispensing volume during actual dispensing. In some application scenarios with small dispensing volumes, dispensing failures may even occur, requiring rework and repair, which seriously affects production efficiency. Utility Model Content

[0004] This invention provides a precision liquid dispensing device that uses a volumetric metering dispensing valve to precisely control the liquid output and a visual inspection mechanism to visually inspect the dispensing object. This automates high-precision liquid dispensing and visual inspection, which improves the efficiency of liquid dispensing operations and has good economic benefits.

[0005] This utility model provides a precision liquid dispensing device, comprising: The indexing plate includes a turntable driven by a rotation drive module. The turntable is provided with multiple positioning units for placing liquid-dispensing objects. Each of the multiple positioning units passes through the loading station, the liquid-dispensing station and the vision inspection station in sequence during the rotation of the turntable. The liquid dispensing mechanism includes a liquid dispensing bracket, a lifting drive module, and a volumetric metering dispensing valve. The lifting drive module is mounted above the positioning unit at the liquid dispensing station via the liquid dispensing bracket, and the volumetric metering dispensing valve is driven by the lifting drive module to reciprocate in the vertical direction. The outlet of the volumetric metering dispensing valve moves toward or away from the positioning unit at the liquid dispensing station. A visual inspection mechanism includes an inspection bracket and a visual camera. The visual camera is fixed above a positioning unit at the visual inspection station via the inspection bracket, and the inspection direction of the visual camera is toward the positioning unit at the visual inspection station. The control host is connected to the rotation drive module, the lifting drive module, the metering dispensing valve, and the vision camera signal respectively.

[0006] In an optional implementation, the plurality of positioning units are evenly arranged circumferentially along the axis of rotation of the turntable.

[0007] In an optional implementation, the positioning unit includes a tooling fixture and a base; The base is disposed on the turntable, and the tooling fixture is detachably mounted on the base; The liquid-dispensing object is placed on the tooling fixture.

[0008] In an optional embodiment, the positioning unit further includes a magnet, which is embedded in the base; The tooling fixture is made of magnetic material, or the tooling fixture has embedded magnetic material.

[0009] In an optional embodiment, the positioning unit further includes a main positioning shaft and a secondary positioning hole. The main positioning shaft is disposed on the base, and the top surface of the main positioning shaft is higher than the base. The secondary positioning hole is disposed on the turntable, and the secondary positioning hole is located on one side of the base. The tooling fixture includes a fixture body and a fixture base. The fixture body is mounted on the top surface of the fixture base. The bottom surface of the fixture base is provided with a main positioning hole adapted to the main positioning shaft and a secondary positioning shaft adapted to the secondary positioning hole. The end face of the secondary positioning shaft protrudes from the bottom surface of the fixture base. The tooling fixture is mounted on the top surface of the corresponding base via the fixture base; The bottom surface of the fixture base is in contact with the top surface of the base, the main positioning shaft extends into and fits in the main positioning hole, and the auxiliary positioning shaft extends into and fits in the auxiliary positioning hole.

[0010] In an optional implementation, a limiting groove is formed on the top surface of the fixture body by a plurality of positioning protrusions, the limiting groove being designed according to the outer contour of the liquid dispensing object.

[0011] In an optional embodiment, the visual inspection mechanism further includes a ring light, which is disposed between the positioning unit and the visual camera at the visual inspection station, and the central area of ​​the ring light is a hollow observation port; The ring light illuminates the positioning unit, and the vision camera detects the positioning unit through the observation port.

[0012] In an optional embodiment, the liquid dispensing object has a liquid dispensing hole, and the liquid dispensing hole has one or more steps. From a top-down view, the outlines between any two steps within the liquid dispensing hole do not completely overlap.

[0013] An optional implementation may also include an air blowing mechanism; The air blowing mechanism includes a guide module, an air blowing structural component, and an air pump; The guide module is mounted on the volumetric metering dispensing valve, and the air blowing structure is mounted on the guide module. The air blowing structure has an enclosed structure, and a plurality of air vents are provided on the inner sidewall of the enclosed structure. An air pipe interface is provided on the surface of the air blowing structure, and the air pipe interface is connected to the air pump through an air pipe. The plurality of air vents are connected to the air pipe interface through the internal flow channel of the air blowing structure. When the outlet of the metering quantitative discharge valve moves toward the positioning unit at the liquid dispensing station, the air blowing structure moves vertically away from the positioning unit at the liquid dispensing station relative to the volumetric metering quantitative discharge valve, guided by the guide module, and the outlet of the metering quantitative discharge valve falls into the enclosed area of ​​the enclosing structure.

[0014] In an optional implementation, the guide module includes a guide rail and a slider; The guide rail is fixed on the volumetric metering dispensing valve, and the air blowing structure is mounted on the slider.

[0015] In summary, this utility model provides a precision liquid dispensing device that achieves fully automatic precision liquid dispensing and liquid volume detection functions. The operator only needs to place the tooling fixture on the turntable, and the entire dispensing and detection process will be completed automatically without manual intervention, significantly improving dispensing efficiency. The liquid extrusion valve in this utility model adopts a volumetric metering quantitative discharge valve design, which can maintain the consistency of liquid discharge and improve dispensing accuracy. By adding an innovative vision system detection mechanism and a coordinated design with the workpiece for visual detection of the liquid volume, the problem of defective products flowing out can be effectively prevented, ensuring the consistency of the liquid volume. The air blowing mechanism ensures the cleanliness of the object being dispensed at the dispensing location, extending the working life of the object, and has good practicality. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a three-dimensional structural diagram of the precision liquid dispensing device according to an embodiment of the present invention.

[0018] Figure 2 This is a three-dimensional structural diagram of the indexing plate according to an embodiment of the present utility model.

[0019] Figure 3 This is a top view of the indexing plate structure according to an embodiment of the present utility model.

[0020] Figure 4 This is a first schematic diagram of the three-dimensional structure of the tooling fixture according to an embodiment of the present utility model.

[0021] Figure 5 This is a second schematic diagram of the three-dimensional structure of the tooling fixture according to an embodiment of the present utility model.

[0022] Figure 6 This is a top view of the liquid dotting object structure according to an embodiment of the present invention.

[0023] Figure 7 This is a partially enlarged structural diagram of the dispensing hole of the dispensing object according to an embodiment of the present invention.

[0024] Figure 8 This is a three-dimensional structural diagram of the liquid dispensing mechanism according to an embodiment of the present invention.

[0025] Figure 9 This is a three-dimensional structural diagram of the visual inspection mechanism according to an embodiment of the present invention.

[0026] Figure 10 This is a three-dimensional structural diagram of the liquid dispensing station of the precision liquid dispensing equipment according to an embodiment of this utility model.

[0027] Figure 11 This is a three-dimensional perspective view of the air blowing mechanism according to an embodiment of the present invention.

[0028] Figure 12 This is a top view of the air blowing mechanism structure according to an embodiment of the present utility model. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0030] Figure 1 This is a three-dimensional structural diagram of the precision liquid dispensing device according to an embodiment of the present invention.

[0031] This utility model discloses a precision liquid dispensing device, including a scale plate 2, a liquid dispensing mechanism 4, a vision inspection mechanism 5, and a control host. In addition, the precision liquid dispensing device is generally installed as a whole on an external reference object (such as the base plate 1 of this utility model embodiment) so as to move the precision liquid dispensing device as a whole.

[0032] In addition to meeting basic functional requirements, the precision dispensing device of this utility model embodiment also includes an air blowing mechanism for a specific dispensing object 3. The specific implementation structure of the air blowing mechanism is described in reference to... Figures 10 to 12 Related schematic structures, in Figure 1 The blowing mechanism is not shown in the diagram.

[0033] Figure 2 This is a three-dimensional structural diagram of the indexing disk 2 according to an embodiment of the present invention. The indexing disk 2 includes a turntable 22 driven by a rotation drive module 21. The turntable 22 is provided with multiple positioning units 24 for setting the liquid-dispensing object 3. Each positioning unit 24 passes sequentially through a loading station 71, a liquid-dispensing station 72, and a visual inspection station 73 during the rotation of the turntable 22. In this embodiment of the present invention, in addition to the above stations, the positioning unit 24 also passes sequentially through a compensation liquid-dispensing station 74 and a final inspection station 75. Generally, the rotation angle of the indexing disk 2 is fixed during a single operation. Accordingly, to ensure the accurate correspondence between the positioning units 24 and the stations, the multiple positioning units 24 are evenly distributed circumferentially along the rotation axis of the turntable 22. Correspondingly, the settings of the relevant mechanisms at each station can be set with the positioning unit 24 at the corresponding station as a positional reference, thereby ensuring that the positioning unit 24 can accurately pass through each station during the rotation of the turntable 22.

[0034] In addition, for the installation of external equipment, a fixed plate 23 is generally provided above the turntable 22 and inside the positioning unit 24.

[0035] Furthermore, specific implementation methods for the rotation drive module 21 can be referenced from existing technologies.

[0036] Figure 3 This is a top view of the indexing plate 2 structure according to an embodiment of the present utility model. In this top view of the indexing plate 2 structure, the tooling fixture on one of the positioning units 24 is hidden and not shown.

[0037] Specifically, in this embodiment of the invention, the positioning unit 24 includes a tooling fixture and a base 241; the base 241 is disposed on the turntable 22, and the tooling fixture is disposed on the base 241; the liquid dispensing object 3 is disposed on the tooling fixture. In practical applications, to improve the posture stability of the tooling fixture on the base 241, in addition to relying on the gravity of the tooling fixture, in this embodiment of the invention, the positioning unit 24 also includes a magnet 244, which is embedded in the base 241. In practical applications, this ensures the posture stability of the tooling fixture on the base 241 and allows for convenient placement and removal of the tooling fixture. It should be noted that, to ensure the effectiveness of the magnet 244, the tooling fixture needs to be made of a magnetic material, or a component made of a magnetic material needs to be embedded in the tooling fixture.

[0038] Figure 4 This is a first three-dimensional structural diagram of the tooling fixture according to an embodiment of the present invention. Figure 5 This is a second schematic diagram of the three-dimensional structure of the tooling fixture according to an embodiment of the present utility model.

[0039] Furthermore, in order to ensure the uniformity of the posture of the tooling fixtures in different positioning units 24, in this embodiment of the present invention, the positioning unit 24 further includes a main positioning shaft 242 and a secondary positioning hole 243. The main positioning shaft 242 is disposed on the base 241, and the top surface of the main positioning shaft 242 is higher than the base 241. The secondary positioning hole 243 is disposed on the turntable 22, and the secondary positioning hole 243 is located on one side of the base 241. The tooling fixture includes a fixture body 247 and a fixture base 246, wherein the fixture body 247 is mounted on the top surface of the fixture base 246; The bottom surface of the fixture base 246 is provided with a main positioning hole 248 adapted to the main positioning shaft 242 and a secondary positioning shaft 245 adapted to the secondary positioning hole 243. The secondary positioning shaft 245 protrudes from the bottom surface of the fixture base 246. The tooling fixture is mounted on the top surface of the corresponding base 241 based on the fixture base 246; The bottom surface of the fixture base 246 is in contact with the top surface of the base 241, the main positioning shaft 242 extends into and fits in the main positioning hole 248, and the secondary positioning shaft 245 extends into and fits in the secondary positioning hole 243.

[0040] Figure 6 This is a top view of the structure of the dotting object 3 according to an embodiment of the present invention. Figure 7 This is a partially enlarged structural diagram of the dispensing hole 31 of the dispensing object 3 in an embodiment of the present invention.

[0041] Specifically, on the top surface of the fixture body 247, a limiting groove 249 is formed by multiple positioning protrusions 250, and the limiting groove 249 is designed according to the surface contour of the liquid-dispensing object 3. In this embodiment of the present invention, the liquid-dispensing object 3 is a fan base plate 1, as shown in the accompanying drawings. Figure 6 As shown in the diagram, the outer contour of the liquid-filled object 3 has contour features that can be used for limiting and positioning. Correspondingly, the detection workpiece is installed in the limiting groove 249 in a uniquely corresponding posture.

[0042] Furthermore, in this embodiment of the invention, a visual inspection mechanism 5 is used to inspect the liquid dosing status of the liquid dosing mechanism 4. The visual inspection mechanism 5 has two main requirements for inspecting the liquid dosing status. On the one hand, it is to detect whether the liquid dosing mechanism 4 has applied liquid to the liquid dosing object 3. This requirement can be accurately identified by the difference in appearance between the liquid and the liquid dosing object 3. On the other hand, it is to detect whether the amount of liquid dosed by the liquid dosing mechanism 4 on the liquid dosing object 3 is appropriate. To achieve this requirement, the liquid dosing object 3 itself needs to be designed.

[0043] Specifically, the liquid-dispensing object 3 has a liquid-dispensing hole 31, and the liquid-dispensing hole 31 is provided with one or more steps; When viewed directly from the point of view 31, the outlines of any two steps within the point of view 31 do not completely overlap.

[0044] Specifically, in this embodiment of the invention, the fan base plate 1 is used as an example of the liquid-dispensing object 3. Specifically, the liquid-dispensing hole 31 refers to the liquid-dispensing object 3 having an enclosed structure at the liquid-dispensing position, which restricts the flow area of ​​the injected liquid. As the amount of injected liquid increases, the liquid level at the liquid-dispensing hole 31 will rise. Furthermore, the liquid-dispensing object 3 has one or more steps. Based on the functional requirements of this embodiment, there is a height difference between different levels of steps, and from a top-down view, the outlines of any two levels of steps within the liquid-dispensing hole 31 do not completely overlap. Through this arrangement, as the amount of injected liquid increases, the liquid level will gradually cover the steps between each level. When the visual inspection mechanism 5 performs inspection, the outline of the steps covered by liquid will show a significant change, thus allowing the visual inspection mechanism 5 to assess the range of injected liquid volume. See the accompanying drawings. Figure 7 A first step 301 is provided at the lowest part of the liquid outlet 31, and a second step 302 and a third step 303 are provided in sequence as the height increases. It should be noted that the step can also be integrated with the positioning structure of the component, so that the step can achieve multiple functions.

[0045] Figure 8 This is a three-dimensional structural diagram of the liquid dispensing mechanism 4 in an embodiment of the present invention.

[0046] The dispensing mechanism 4 includes a dispensing bracket 41, a lifting drive module 42, and a volumetric metering dispensing valve. The lifting drive module 42 is mounted above the positioning unit 24 at the dispensing station 72 via the dispensing bracket 41. The volumetric metering dispensing valve is driven by the lifting drive module 42 to reciprocate vertically, and the outlet of the volumetric metering dispensing valve moves toward or away from a preset position of the positioning unit 24. Specifically, the lifting drive module 42 is installed via the dispensing bracket 41. The lifting drive module 42 can be a lifting cylinder module or a lifting electric cylinder module. The volumetric metering dispensing valve includes a body 43 and a storage tank 44. The body 43 is driven by the lifting drive module 42. The storage tank 44 can be fixed on the dispensing bracket 41 or driven together with the body 43 via the lifting drive module 42. The body 43 and the storage tank 44 can be connected by a pipe.

[0047] Figure 9 This is a three-dimensional structural diagram of the visual inspection mechanism 5 according to an embodiment of the present invention.

[0048] The visual inspection mechanism 5 includes an inspection bracket 51 and a visual camera 53. The visual camera 53 is mounted above the positioning unit 24 at the visual inspection station 73 via the inspection bracket 51, and the inspection direction of the visual camera 53 faces the positioning unit 24 at the visual inspection station 73. Further, the visual inspection mechanism 5 also includes a ring light 52, which is positioned between the visual camera 53 and the positioning unit 24 at the visual inspection station 73. The central area of ​​the ring light 52 is a hollow observation port; the illumination direction of the ring light 52 faces the positioning unit 24, and the visual camera 53 inspects the positioning unit 24 through the observation port. (See attached figures) Figure 9 In the accompanying drawings, the detection view trajectory 5454 of the visual camera 53 is shown in the corresponding outline.

[0049] The control host of this embodiment is connected to the rotation drive module 21, the lifting drive module 42, the metering dispensing valve, and the vision camera 53 via signals. Specifically, the control host is generally a microcomputer device capable of running visual inspection software. The signals from the vision camera 53 are transmitted to the microcomputer device, which then controls the movement rhythm of the other mechanisms.

[0050] Furthermore, when the indexing plate 2 has a sufficient number of indexes, a compensation point liquid station 74 and a final inspection station 75 can be added.

[0051] Specifically, during the rotation of the turntable 22, each of the plurality of positioning units 24 passes through the feeding station 71, the liquid dispensing station 72 and the vision inspection station 73 in sequence, and then passes through the compensation liquid dispensing station 74. A compensation liquid dispensing mechanism is also provided at the compensation liquid dispensing station 74. The compensation liquid dispensing mechanism includes a compensation liquid dispensing bracket, a compensation lifting drive module, and a compensation volume metering quantitative discharge valve. The compensation lifting drive module is set above the positioning unit at the compensation liquid dispensing station through the compensation liquid dispensing bracket, and the compensation metering quantitative discharge valve is driven by the compensation lifting drive module to reciprocate in the vertical direction. The discharge port of the compensation metering quantitative discharge valve moves toward or away from the preset position of the positioning unit. The compensation lifting drive module is connected to the control host via a signal.

[0052] Specifically, during the rotation of the turntable 22, each of the plurality of positioning units 24 passes through the loading station 71, the dispensing station, the vision inspection station 73, and the compensation dispensing station 74 in sequence, and then passes through the final inspection station 75. A final inspection visual inspection mechanism is provided at the final inspection station 75. The final inspection visual inspection mechanism includes a final inspection inspection bracket and a final inspection visual camera. The final inspection visual camera is mounted above the positioning unit at the final inspection station via the final inspection inspection bracket, and the inspection direction of the final inspection visual camera is towards the positioning unit at the final inspection station.

[0053] It should be noted that the physical structure of the compensation liquid dotting mechanism is actually the same as that of the liquid dotting mechanism 4, and the physical structure of the final inspection visual inspection mechanism is actually the same as that of the visual inspection mechanism 5. This utility model embodiment will not be described and introduced again.

[0054] Furthermore, to avoid introducing dust during the entire dispensing process and affecting the dispensing effect, the precision dispensing equipment is generally placed on a clean bench to remove dust through a clean airflow. However, some dust adhering to the dispensing object 3 cannot be removed by the clean airflow, especially the dust at the dispensing position of the dispensing object 3. This dust will contaminate the dispensing liquid and affect the working effect. Therefore, it is necessary to specifically remove the dust adhering to the dispensing position of the dispensing object 3.

[0055] Figure 10 This is a three-dimensional structural diagram of the liquid dispensing station of the precision liquid dispensing equipment according to an embodiment of this utility model. Figure 11 This is a three-dimensional perspective view of the air blowing mechanism according to an embodiment of the present invention. Figure 12 This is a top view of the air blowing mechanism structure according to an embodiment of the present utility model.

[0056] The precision liquid dispensing device of this utility model embodiment also includes an air blowing mechanism; The air blowing mechanism includes a guide module, an air blowing structural component, and an air pump; The guiding module is mounted on the volumetric metering dispensing valve, and the air-blowing structure is mounted on the guiding module. Optionally, the guiding module includes a guide rail 84 and a slider. The guide rail 84 is fixed on the volumetric metering dispensing valve, and the air-blowing structure is mounted on the slider. Furthermore, to increase the downward pressure, a limiting baffle 83 can be fixedly mounted on the guide rail 84. A pressurized elastic element 82 is positioned between the limiting baffle 83 and the air-blowing structure. When the air-blowing structure contacts the liquid-dispensing object 3, the elastic element 82 provides more downward pressure to the air-blowing structure, preventing the liquid-dispensing object 3 from being blown away.

[0057] Specifically, the air-blowing structure has an enclosing structure 88 and a connecting structure 81. A plurality of air vents 86 are provided on the inner wall of the enclosing structure 88. An air pipe interface 87 is provided on the surface of the air-blowing structure. The air pipe interface 87 is connected to the air pump via an air pipe. The plurality of air vents 86 are connected to the air pipe interface 87 via an internal flow channel 85 of the air-blowing structure. The enclosing structure 88 is fitted onto the slider via the connecting structure 81. (Refer to the accompanying drawings.) Figure 11 and Figure 12 The schematic diagram shows the structure of the vent 86 and the internal flow channel 85. In actual implementation, the orientation of the vent 86 is designed according to the position to be blown. In actual processing, this blowing structure can be made by additive printing, which can avoid the complexity of processing the internal structure.

[0058] When the outlet of the metering quantitative discharge valve moves toward the positioning unit 24 at the liquid dispensing station 72, the air blowing structure moves in a vertical direction away from the positioning unit 24 at the liquid dispensing station 72 relative to the volume metering quantitative discharge valve, guided by the guide module, and the outlet of the metering quantitative discharge valve falls into the enclosed area of ​​the enclosed structure 88. The air pump is connected to the control host via a signal, and the physical structure of the air pump is not shown in the accompanying drawings.

[0059] Specifically, based on the control of the host computer, the workflow of the precision liquid dispensing device in this embodiment of the invention includes: Install the liquid dispensing object 3 onto the tooling fixture; The tooling fixture containing the liquid object 3 is installed as a whole onto the base 241 of the loading station 71. For clarity of explanation, this base 241 is named target base 241. Turntable 22 rotates, and target base 241 rotates to liquid dispensing station 72; The lifting drive module 42 drives the volumetric metering dispensing valve to move downward. During the downward movement, the bottom surface of the surrounding structure 88 first contacts the liquid dispensing object 3. The surrounding structure 88 remains stationary until the volumetric metering dispensing valve moves into place. When the air pump is started, the airflow flows into the air blowing structure through the air pipe interface 87, and after passing through the internal flow channel 85, it is sprayed out from each air vent 86 to flush the liquid dispensing position with airflow and ensure the cleanliness of the liquid dispensing position. After the air cleaning is completed, the metering dispensing valve is activated to inject a fixed volume of liquid into the liquid outlet 31. The lifting drive module 42 drives the volumetric metering dispensing valve to move upward, and the surrounding structure 88 rises synchronously, detaching from the contact with the liquid dispensing object 3. Turntable 22 rotates, and target base 241 rotates to the visual inspection station 73; The visual inspection unit 5 starts the inspection. After visually acquiring the liquid dispensing situation in the dispensing hole 31, it hands it over to the program on the control host to determine the qualification of the liquid dispensing. After the visual inspection agency 5 completes the inspection, the turntable 22 continues to rotate. The target base 241 passes through the compensation point liquid station 74 and the final inspection station 75 in sequence, and then arrives at the unloading station 76. In actual implementation, the loading station 71 and the unloading station 76 can be integrated into one station or split into two stations.

[0060] Specifically, when the visual inspection mechanism 5 fails the inspection, the amount of liquid to be compensated is determined by the liquid covering the step inside the liquid dispensing hole 31 on the liquid dispensing object 3. When the target base 241 rotates to the liquid compensation dispensing station 74, the liquid compensation dispensing mechanism is used to perform a second liquid dispensing operation. After the target base 241 rotates to the final inspection station 75, the final inspection vision camera is used to perform a second inspection. Through this second liquid dispensing operation and second inspection, the yield rate of liquid dispensing can be guaranteed. If the second inspection still fails, the defective product needs to be marked and sorted with the qualified products when it is taken out at the unloading station 76.

[0061] In summary, this utility model provides a precision liquid dispensing device that achieves fully automatic precision liquid dispensing and liquid volume detection functions. Operators only need to place the tooling fixture on the turntable, and the entire dispensing and detection process will be completed automatically without manual intervention, significantly improving dispensing efficiency. The liquid extrusion valve in this utility model adopts a volumetric metering quantitative discharge valve design, which can maintain the consistency of liquid discharge and improve dispensing accuracy. By adding an innovative vision system detection mechanism and cooperating with the workpiece for visual detection of the liquid volume, the problem of defective products flowing out can be effectively prevented, ensuring the consistency of the liquid volume. The air blowing mechanism ensures the cleanliness of the object being dispensed at the dispensing location, extending the working life of the object, and has good practicality.

[0062] The above provides a detailed description of a precision liquid dispensing device provided by the embodiments of this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A precision liquid dispensing device, characterized in that, include: The indexing plate includes a turntable driven by a rotation drive module. The turntable is provided with multiple positioning units for placing liquid-dispensing objects. Each of the multiple positioning units passes through the loading station, the liquid-dispensing station and the vision inspection station in sequence during the rotation of the turntable. The liquid dispensing mechanism includes a liquid dispensing bracket, a lifting drive module, and a volumetric metering dispensing valve. The lifting drive module is mounted above the positioning unit at the liquid dispensing station via the liquid dispensing bracket, and the volumetric metering dispensing valve is driven by the lifting drive module to reciprocate in the vertical direction. The outlet of the volumetric metering dispensing valve moves toward or away from the positioning unit at the liquid dispensing station. A visual inspection mechanism includes an inspection bracket and a visual camera. The visual camera is fixed above a positioning unit at the visual inspection station via the inspection bracket, and the inspection direction of the visual camera is toward the positioning unit at the visual inspection station. The control host is connected to the rotation drive module, the lifting drive module, the metering dispensing valve, and the vision camera signal respectively.

2. The precision dispensing device as described in claim 1, characterized in that, The plurality of positioning units are evenly arranged circumferentially along the axis of rotation of the turntable.

3. The precision dispensing device as described in claim 2, characterized in that, The positioning unit includes a tooling fixture and a base; The base is disposed on the turntable, and the tooling fixture is detachably mounted on the base; The liquid-dispensing object is placed on the tooling fixture.

4. The precision dispensing device as described in claim 3, characterized in that, The positioning unit also includes a magnet, which is embedded in the base; The tooling fixture is made of magnetic material, or the tooling fixture has embedded magnetic material.

5. The precision dispensing device as described in claim 3, characterized in that, The positioning unit further includes a main positioning shaft and a secondary positioning hole. The main positioning shaft is disposed on the base, and the top surface of the main positioning shaft is higher than the base. The secondary positioning hole is disposed on the turntable, and the secondary positioning hole is located on one side of the base. The tooling fixture includes a fixture body and a fixture base. The fixture body is mounted on the top surface of the fixture base. The bottom surface of the fixture base is provided with a main positioning hole adapted to the main positioning shaft and a secondary positioning shaft adapted to the secondary positioning hole. The end face of the secondary positioning shaft protrudes from the bottom surface of the fixture base. The tooling fixture is mounted on the top surface of the corresponding base via the fixture base; The bottom surface of the fixture base is in contact with the top surface of the base, the main positioning shaft extends into and fits in the main positioning hole, and the auxiliary positioning shaft extends into and fits in the auxiliary positioning hole.

6. The precision dispensing device as described in claim 5, characterized in that, On the top surface of the fixture body, a limiting groove is formed by multiple positioning protrusions, and the limiting groove is designed according to the outer edge contour of the liquid dispensing object.

7. The precision dispensing device as described in claim 1, characterized in that, The visual inspection mechanism also includes a ring light, which is positioned between the positioning unit and the visual camera at the visual inspection station, and the central area of ​​the ring light is a hollow observation port. The ring light illuminates the positioning unit, and the vision camera detects the positioning unit through the observation port.

8. The precision dispensing device as described in claim 1, characterized in that, The liquid dispensing object has a liquid dispensing hole, and the liquid dispensing hole is provided with one or more steps; From a top-down view, the outlines between any two steps within the liquid dispensing hole do not completely overlap.

9. The precision dispensing device as described in claim 1, characterized in that, It also includes an air blowing mechanism; The air blowing mechanism includes a guide module, an air blowing structural component, and an air pump; The guide module is mounted on the volumetric metering dispensing valve, and the air blowing structure is mounted on the guide module. The air blowing structure has an enclosed structure, and a plurality of air vents are provided on the inner sidewall of the enclosed structure. An air pipe interface is provided on the surface of the air blowing structure, and the air pipe interface is connected to the air pump through an air pipe. The plurality of air vents are connected to the air pipe interface through the internal flow channel of the air blowing structure. When the outlet of the metering quantitative discharge valve moves toward the positioning unit at the liquid dispensing station, the air blowing structure moves vertically away from the positioning unit at the liquid dispensing station relative to the volumetric metering quantitative discharge valve, guided by the guide module, and the outlet of the metering quantitative discharge valve falls into the enclosed area of ​​the enclosing structure. The air pump is connected to the control host via a signal.

10. The precision dispensing device as described in claim 9, characterized in that, The guiding module includes a guide rail and a slider; The guide rail is fixed on the volumetric metering dispensing valve, and the air blowing structure is mounted on the slider.

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