Spray head of coating machine spray gun

Abstract

The utility model relates to a spray head of a spray gun of a coating machine, which is characterized in that a gas cap at the front part of the spray head is provided with a first-stage gasification hole, a second-stage gasification hole, a third-stage gasification hole and an anti-dripping gasification hole, the second-stage gasification hole, the third-stage gasification hole and the anti-dripping gasification hole are sequentially positioned on the periphery of the first-stage gasification hole and form a certain oblique angle with the axial direction of the liquid outlet of the nozzle; and the first-stage gasification hole, the second-stage gasification hole, the third-stage gasification hole and the anti-dripping gasification hole are respectively connected with a compressed gas interface on the spray gun through pipelines. By the adoption of the technical scheme, the airflow direction is changed through the anti-dripping gasified flow, accumulation and dripping are reduced by applying upward force to atomized liquid, then the atomized liquid is evenly atomized through the second-stage porous gasified flow, and spraying of the atomized body can be controlled within a certain atomization range. Sprayed liquid can be uniformly dispersed and cannot be accumulated and dripped; according to the utility model, the requirements of a film coating process of a pharmaceutical factory can be well met, and the yield of a coating procedure is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of coating machine equipment, specifically to a nozzle for a coating machine spray gun. Background Technology

[0002] A coating machine is a device used to coat materials. It typically consists of a spray gun and a roller mechanism. The material to be coated is placed in the roller, and then the coating liquid is sprayed in through the spray gun, so that the material is fully and evenly coated with the coating liquid inside the roller, forming a strong and smooth surface film.

[0003] A Chinese patent with publication number CN205199760U discloses a novel nozzle for a coating machine spray gun. The nozzle's front cap is equipped with primary, secondary, and tertiary atomization holes, optimizing the uniformity of the atomized material.

[0004] The problem with the aforementioned technologies is that during prolonged spraying operations, the coating solution tends to accumulate at the nozzle, forming droplets that fall and cause the drugs to stick together, affecting the coating effect and yield. Summary of the Invention

[0005] The purpose of this invention is to provide a spray nozzle for a coating machine used for coating pharmaceuticals. By using this device, the problem of coating liquid gradually accumulating at the nozzle, forming droplets, and falling down, causing the pharmaceuticals to stick together, is solved.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a spray gun nozzle for preventing adhesion in pharmaceutical coating, wherein the air cap at the front of the nozzle is provided with a primary vaporization hole, a secondary vaporization hole, a tertiary vaporization hole, and an anti-drip vaporization hole, wherein the primary vaporization hole is located close to the nozzle outlet, the secondary and tertiary vaporization holes are located sequentially around the primary vaporization hole and at a certain angle to the axial direction of the nozzle outlet, and the anti-drip vaporization hole is located directly below the nozzle and at a certain angle to the axial direction of the nozzle outlet. The primary, secondary, tertiary, and anti-drip vaporization holes are respectively connected to the compressed gas interface on the spray gun through pipelines. The gas cap is provided with anti-drip vaporization holes distributed directly below the nozzle; the gas cap is provided with four secondary vaporization holes, which are evenly spaced and circumferentially distributed; the gas cap is provided with two tertiary vaporization holes, which are symmetrically distributed on both sides of the nozzle outlet; in order to prevent the gradual accumulation of droplets at the nozzle, the present invention provides anti-drip vaporization holes, which are distributed directly below the nozzle and tilted towards the nozzle to increase atomization capacity and change the atomization distribution direction.

[0007] The high-pressure airflow from the first-stage atomization orifice creates negative pressure at the liquid inlet, drawing out the liquid for primary atomization to form an atomized liquid. Because coating powder accumulates and forms droplets in the first-stage atomization flow, an anti-drip atomization flow changes the airflow direction and applies an upward force to the atomized liquid, reducing accumulation and dripping. The second-stage porous atomization flow then further atomizes the liquid evenly, ensuring the atomized spray is controlled within a specific atomization range. Finally, a third-stage atomization flow alters the atomization shape, ultimately achieving optimal atomization and reducing adhesion.

[0008] The beneficial effects of this invention are as follows: by adopting the above technical solution, the sprayed liquid can be evenly dispersed without accumulating and dripping; this invention can well meet the requirements of the film coating process in pharmaceutical factories and improve the yield of the coating process.

[0009] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the overall design of this utility model.

[0011] Figure 2 This is a schematic diagram of the pore distribution of this utility model;

[0012] In the diagram: 1. Spray gun body, 2. Compressed air interface, 3. Nozzle outlet, 4. Nozzle head, 5. Needle valve, 6. Secondary vaporization orifice, 7. Primary vaporization orifice, 8. Tertiary vaporization orifice, 9. Anti-drip vaporization orifice, 10. Connecting cap, 11. Valve needle, 12. Primary / secondary vaporization orifice pipeline, 13. Tertiary vaporization orifice pipeline, 14. Anti-drip vaporization orifice pipeline, 15. Liquid inlet, 16. Needle valve air interface, 17. Air cap Detailed Implementation

[0013] like Figure 1 , Figure 2 As shown, this utility model discloses a spray nozzle for a coating machine. The nozzle 4 has a cap 17 at its front end with a primary aeration hole 7, a secondary aeration hole 6, a tertiary aeration hole 8, and an anti-drip aeration hole 9. The primary aeration hole is located immediately adjacent to the nozzle outlet 3. The secondary and tertiary aeration holes 6 and 8 are sequentially located around the primary aeration hole and form a certain angle with the axial direction of the nozzle outlet 3. The anti-drip aeration hole 9 is located below the nozzle and forms a certain angle with the axial direction of the nozzle outlet 3. The primary aeration hole 7, secondary aeration hole 6, tertiary aeration hole 8, and anti-drip aeration hole 9 are connected to the compressed gas interface 2 on the spray gun via primary / secondary aeration hole pipes 12, tertiary aeration hole pipes 13, and anti-drip aeration hole pipes 14, respectively. The nozzle 4 is fixed to the spray gun body 1 by a cap 10.

[0014] To prevent droplets from gradually accumulating at the nozzle, the nozzle of this utility model is provided with an anti-drip atomization hole 9 located below the nozzle and at a certain angle to the axial direction of the nozzle outlet 3. The anti-drip atomization flow changes the airflow direction and applies an upward force to the atomized liquid to reduce accumulation and dripping. Then, the liquid is atomized uniformly again through a second-stage porous atomization flow.

[0015] In use: 1. First, connect the compressed air interface 2 and needle valve air interface 16 to the compressed air plastic tube, connecting them to the equipment's air source; connect the liquid inlet 15 to the liquid pipe. 2. Open the compressed air control valve, simultaneously introducing compressed air into the primary vaporization hole 7, secondary vaporization hole 6, tertiary vaporization hole 8, and anti-drip vaporization hole 9. 3. Open the needle valve 5, then open the liquid control valve, allowing the liquid to enter the sealing sleeve and be sprayed out through the nozzle at the front end of the sealing sleeve. 4. The sprayed liquid is atomized under the vaporization action of the primary, secondary, and tertiary vaporization holes and the anti-drip hole, achieving the effect of preventing the accumulation of droplets at the nozzle and causing the medicine to adhere, while also ensuring uniform atomization. The entire atomization process is controlled by a PLC program.

Claims

1. A nozzle for a coating machine spray gun, characterized in that: The nozzle's front cap is equipped with a primary vaporization hole, a secondary vaporization hole, a tertiary vaporization hole, and an anti-drip vaporization hole. The primary vaporization hole is located close to the nozzle's liquid outlet. The secondary and tertiary vaporization holes are located sequentially around the primary vaporization hole and are at a certain angle to the nozzle's liquid outlet axis. The anti-drip vaporization hole is located directly below the nozzle and is at a certain angle to the nozzle's liquid outlet axis. The primary, secondary, tertiary, and anti-drip vaporization holes are connected to the compressed gas interface on the spray gun via pipelines.

2. The nozzle of a coating machine spray gun according to claim 1, characterized in that: The gas cap is provided with anti-drip vaporization holes and is distributed directly below the nozzle.

3. The nozzle of a coating machine spray gun according to claim 1 or 2, characterized in that: The gas cap is provided with four secondary vaporization holes, which are evenly spaced and distributed in a circular pattern.

4. The nozzle of a coating machine spray gun according to claim 1 or 2, characterized in that: The gas cap is provided with two three-stage vaporization holes, which are symmetrically distributed on both sides of the nozzle liquid outlet.

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