Ring air duct glue blowing weighing mechanism

Abstract

The utility model provides a kind of annular air duct glue blowing weighing mechanism, including electronic scale, and the weighing end of electronic scale upper side is used to joint storage barrel, and the opening of storage barrel is upward;The upper end surface of electronic scale is additionally provided with injection cleaning assembly, and compressed air is injected to the outer wall of infusion needle, and injection air passage is provided in injection cleaning assembly;Injection air passage is annular, and it is injected to the direction of circle center;Needle is located in the circle center position of injection air passage.Through the design of injection air passage as annular structure, and make it to the direction of circle center injection compressed air, it can make compressed air cover the ring area of needle outer wall, and make needle outer wall circumferential uniform stress, to completely eliminate the "low pressure zone" or "air flow dead angle" caused by airflow distribution uneven of traditional symmetrical nozzle structure.Glue can be effectively removed in any position of needle outer wall, significantly improve the comprehensiveness and reliability of cleaning.

Description

Technical Field

[0001] This utility model relates to the field of dispensing machine technology, specifically a ring-shaped air duct blowing and weighing mechanism. Background Technology

[0002] The core function of a dispensing machine is to precisely apply a specific amount of adhesive to a designated location on a workpiece. To ensure continuous and stable dispensing operations, dispensing machines are typically equipped with a storage tank to store and continuously supply adhesive.

[0003] During the glue injection process, the storage bucket is weighed to ensure that the amount of glue in the bucket meets the batch or stage usage requirements, and that there is no shortage or waste.

[0004] During the dispensing process, due to the adhesive's inherent viscosity, some adhesive will inevitably adhere to the outer wall of the dispensing needle. In continuous assembly line operations, the adhesive residue on the needle's outer wall can contaminate the feed inlet and internal structure of the storage tank during the next dispensing cycle, or even drip onto other parts of the equipment, severely affecting the stability of the dispensing quality and the cleanliness of the equipment.

[0005] To address this issue, existing technologies generally employ compressed air jetting to remove residual adhesive from the outer wall of the needle. Traditional cleaning devices typically consist of two symmetrically arranged compressed air nozzles located on opposite sides of the needle, simultaneously jetting airflow onto the outer wall of the needle. The combined action of the airflow from both sides blows the adhesive off the needle surface.

[0006] However, this symmetrical nozzle arrangement has significant technical flaws. When compressed air is sprayed from the position directly opposite the needle tip surface, the air pressure is strongest there, but the pressure decreases sharply to both sides along the circumference of the needle tip. This uneven pressure distribution creates "low-pressure zones" or "airflow dead zones" on the leeward side or in the area where airflows converge on both sides of the needle tip, making it impossible to effectively blow away the glue adhering to these areas.

[0007] Therefore, there is an urgent need for a new technical solution to overcome the problems of uneven cleaning and poor performance of existing symmetrical compressed air degumming structures. Utility Model Content

[0008] To address the technical problems in the background art, this utility model discloses an annular air duct blowing and weighing mechanism.

[0009] This utility model provides a ring-shaped air duct blowing and weighing mechanism, including an electronic scale. The weighing end on the upper side of the electronic scale is used to snap onto a storage bucket, and the opening of the storage bucket faces upward. The upper surface of the electronic scale is also equipped with a spray cleaning component, which sprays compressed air onto the outer wall of the injection needle. The spray cleaning component is provided with a spray air channel. The jet nozzle is circular, spraying towards the center of the circle; The needle is located at the center of the jet air passage.

[0010] Furthermore, the jet direction of the jet duct is arranged obliquely downwards.

[0011] Furthermore, it includes an air knife holder and an air knife cover connected to the upper end of the air knife holder; An air knife gasket connects the air knife holder and the air knife cover; The area between the upper end face of the air knife seat, the lower end face of the air knife cover, and the inner side of the air knife gasket constitutes the jet air passage.

[0012] Furthermore, the side wall of the air knife holder is provided with two symmetrically arranged air inlets; The upper end of the air knife holder is provided with a recessed air groove that communicates with the air inlet; The internal areas of the air duct and the air knife gasket are connected.

[0013] Furthermore, the inner wall of the air knife gasket is provided with two symmetrical, inwardly protruding bumps; The protrusion is positioned at the center between the air ducts.

[0014] Furthermore, the bump is V-shaped, with its tip pointing towards the center of the air knife seat.

[0015] Furthermore, a gap is provided between the tip of the protrusion and the center of the air knife seat, and the wall of the axially extending insertion hole.

[0016] Furthermore, the radial cross-section at the upper end of the insertion hole is a wedge shape with an upward flaring opening.

[0017] The beneficial effects of this invention are as follows: By designing the jet air passage as a ring structure and spraying compressed air towards the center, the compressed air can cover the ring area of ​​the needle's outer wall, and the outer wall of the needle is subjected to uniform force circumferentially. This completely eliminates the "low-pressure zone" or "airflow dead zone" caused by uneven airflow distribution in traditional symmetrical nozzle structures. Any glue residue on the outer wall of the needle can be effectively removed, significantly improving the comprehensiveness and reliability of cleaning. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a front sectional view of the present invention; Figure 3 yes Figure 2 Enlarged view of point A in the middle; Figure 4This is a structural schematic diagram of the hidden parts of this utility model; Figure 5 This is a top view of the connection structure between the air knife gasket and the air knife seat; Figure 6 This is the front sectional view of the air knife holder; Figure 7 This is a schematic diagram of the air knife holder structure; Figure 8 This is a structural schematic diagram of the wind knife holder from another perspective; Figure 9 It is an exploded view of the air knife holder, air knife gasket, air knife cover, and cover. In the diagram: 1. Electronic scale; 2. Storage bin; 3. Air knife holder; 4. Air knife cover; 5. Air knife gasket; 6. Base; 7. Cover; 8. Fixing plate; 9. Clamping block; 10. Threaded hole; 11. Connector; 12. Pipe; 13. Solenoid valve; 31. Air inlet; 32. Air duct; 33. Insertion hole; 34. Protruding ring; 35. Locking block; 36. Connecting hole; 41. Through hole; 51. Protrusion; 71. Air outlet. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0021] like Figure 1-9 As shown, this utility model discloses a ring-shaped air duct blowing and weighing mechanism, including a base 6, with an electronic scale 1 installed on the upper end of the base 6. A retaining ring is provided at the weighing end of the upper surface of the electronic scale 1, and the storage tank 2 has its opening facing upwards, with its lower end clamped onto the retaining ring. A cover 7 is also provided on the upper surface of the electronic scale 1 to fit the storage tank 2, and a radially protruding, square-shaped fixing plate 8 is provided at the lower end of the cover 7. Two U-shaped clamping blocks 9, with their openings horizontally facing the fixing plate 8, clamp and fix the cover 7, the electronic scale 1, and the base 6. Specifically, the upper side of the lower arm of the clamping block 9 abuts against the lower end of the top plate of the base 6, and the upper arm of the clamping block 9 is higher than the fixing plate 8. The upper arm of the clamping block 9 is provided with a threaded hole 10, and a bolt is threaded downwards into this threaded hole 10 and abuts against the fixing plate 8, thus achieving a fixed connection between the cover 7, the electronic scale 1, and the base 6, and providing a quick assembly and disassembly function.

[0022] This utility model also includes an air knife holder 3, the lower end of which is provided with a raised ring 34, which is inserted into the upper end of the cover 7 to achieve a snap-fit ​​and limit position. The air knife holder 3 is provided with an insertion hole 33 extending from the axis at the center position. The needle for injecting glue passes downward through the insertion hole 33 to inject glue into the storage tank 2.

[0023] like Figure 2 and Figure 3As shown, an air knife gasket 5 and an air knife cover 4 are coaxially connected to the upper end of the air knife holder 3. Locking bolts pass through the air knife cover 4 and the air knife gasket 5, and are threaded into the air knife holder 3, thus fixing the air knife holder 3, air knife gasket 5, and air knife cover 4. The air knife gasket 5 serves as a seal. An axially extending through hole 41, coaxial with the insertion hole 33, is provided at the center of the air knife cover 4, also for needle insertion. The inner diameter of the air knife gasket 5 is larger than the inner diameters of the insertion hole 33 and the through hole 41, thus forming a jet air passage between the upper end face of the air knife holder 3, the lower end face of the air knife cover 4, and the inner side of the air knife gasket 5. This jet air passage is annular, spraying towards the center, with the needle located at the center of the jet air passage. Two symmetrically arranged air inlets 31 are provided on the side wall of the air knife holder 3; the outer ends of the air inlets 31 are connected to the air outlet of the air compressor via a connector 11, a pipe 12, and a solenoid valve 13. The upper end of the air knife holder 3 has two symmetrically arranged, recessed, arc-shaped air grooves 32. A connecting hole 36 extends downwards from the upper end of the air knife holder 3, connecting the air inlet 31 to the air groove 32. The connecting hole 36 is aligned with the center of the air groove 32, and the outer wall of the air groove 32 is flush with the inner wall of the air knife gasket 5. With this configuration, compressed air sequentially passes through the air inlet 31 and the air groove 32 into the injection channel, and is sprayed in a ring towards the needle to remove residual adhesive from the needle.

[0024] The upper part of the shroud 7 is provided with a plurality of evenly spaced air outlets 71, and the air after the injection needle flows outward from the air outlet groove. The setting of the air outlets 71 will reduce the snap-fit ​​strength between the air knife seat 3 and the shroud 7, so the lower end of the protruding ring 34 is also integrally formed with a plurality of evenly distributed snap-fit ​​blocks 35, which are inserted into the area of ​​the shroud 7 located below the air outlets 71.

[0025] The above configuration, by designing the injection air passage as a ring structure and directing compressed air towards the center, ensures that the compressed air covers the ring-shaped area of ​​the needle's outer wall and that the outer wall of the needle is subjected to uniform force circumferentially. This completely eliminates the "low-pressure zone" or "airflow dead zone" caused by uneven airflow distribution in traditional symmetrical nozzle structures. Any glue residue on the outer wall of the needle can be effectively removed, significantly improving the comprehensiveness and reliability of cleaning.

[0026] As air flows into the jet air passage from two oppositely arranged air ducts 32, airflow opposition occurs, causing turbulence at the point of airflow opposition. This reduces the airflow impact force on the area directly opposite the needle, affecting the glue removal efficiency. Therefore, if... Figure 5As shown, the inner wall of the air knife pad 5 is provided with two symmetrical, inwardly protruding protrusions 51; the protrusions 51 are located at the center between the air channels 32. The protrusions 51 are V-shaped, with their tips pointing towards the center of the air knife seat 3; there is a gap between the tip of the protrusion 51 and the wall of the insertion hole 33. The beneficial effects of this arrangement are: 1. The outer surface of the protrusion 51 guides the airflow, directly directing the airflow to the needle, avoiding airflow collision and reducing the impact force on the needle; 2. A narrow spray gap is formed between the tip of the V-shaped protrusion 51 and the outer wall of the needle. According to the principle of fluid mechanics, the airflow velocity increases when passing through this narrow area (Venturi effect), forming a local high-pressure, high-speed airflow impact zone, thereby strengthening the shear force on the adhesive and improving cleaning efficiency.

[0027] The jet air passage is perpendicular to the needle. When air is sprayed onto the needle, glue tends to flow upwards. Therefore, the radial cross-section of the upper end of the insertion hole 33 is a wedge shape with an upward flaring opening, so that the jet air passage is arranged obliquely downwards.

[0028] In this embodiment, the air knife holder 3 adopts a traditional structure with two air inlets 31, and an improvement is made to this structure without the need to manufacture a new air knife holder 3 or change the connection structure between the air knife holder 3 and the air compressor, resulting in low improvement cost.

[0029] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A ring-shaped air duct blowing and weighing mechanism, comprising an electronic scale (1), wherein the weighing end of the upper side of the electronic scale (1) is used to engage a storage tank (2), and the opening of the storage tank (2) faces upward; the upper end face of the electronic scale (1) is also equipped with a spray cleaning component to spray compressed air onto the outer wall of the injection needle, characterized in that: The jet cleaning component is provided with a jet air passage; The jet air passage is annular and sprays towards the center; The needle is located at the center of the jet air passage.

2. The annular air duct blowing and weighing mechanism according to claim 1, characterized in that: The jetting direction of the jetting air passage is arranged obliquely downward.

3. The annular air duct blowing and weighing mechanism according to claim 2, characterized in that: Includes air knife seat (3) and air knife cover (4) connected to the upper end of the air knife seat (3); An air knife gasket (5) is connected between the air knife seat (3) and the air knife cover (4); The area between the upper end face of the air knife seat (3), the lower end face of the air knife cover (4), and the inner side of the air knife pad (5) constitutes the jet air passage.

4. The annular air duct blowing and weighing mechanism according to claim 3, characterized in that: The side wall of the air knife holder (3) is provided with two symmetrically arranged air inlets (31). The upper end of the air knife seat (3) is provided with a recessed air groove (32) that communicates with the air inlet (31). The air duct (32) is connected to the internal area of ​​the air knife gasket (5).

5. The annular air duct blowing and weighing mechanism according to claim 4, characterized in that: The inner wall of the air knife gasket (5) is provided with two symmetrical, inwardly protruding protrusions (51). The protrusion (51) is located at the center between the air ducts (32).

6. The annular air duct blowing and weighing mechanism according to claim 5, characterized in that: The protrusion (51) is V-shaped, with its tip pointing towards the center of the air knife seat (3).

7. The annular air duct blowing and weighing mechanism according to claim 6, characterized in that: A gap is provided between the tip of the protrusion (51) and the wall of the axially extending insertion hole (33) of the air knife seat (3).

8. The annular air duct blowing and weighing mechanism according to claim 7, characterized in that: The radial cross section at the upper end of the insertion hole (33) is a wedge shape with an upward flaring opening.

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