A vacuum spray coater

Abstract

This utility model discloses a vacuum spraying machine, belonging to the technical field of spraying equipment. The vacuum spraying machine includes a horizontal cylinder with a stirring shaft coaxial with it inside the cylinder. Radially outward-extending support rods are fixed on the circumference of the stirring shaft. Main blades are fixed to the free ends of each support rod. Main blades of the same phase are collectively fixed to an integral main lifting plate, which extends along the entire length of the cylinder and is parallel to the stirring shaft axis. Secondary blades are fixed to the middle sections of each support rod. Secondary blades of the same phase are collectively fixed to an integral secondary lifting plate, which extends along the entire length of the cylinder and is parallel to the stirring shaft axis. This vacuum spraying machine can achieve stable and uniform mixing of materials, significantly reducing the generation of broken material, thereby ensuring the quality of the material and improving production efficiency.

Description

Technical Field

[0001] This utility model relates to a vacuum spraying machine, which can directly spray liquid additives, such as oil, liquid fat or trace elements, onto expanded particles after the drying process, belonging to the technical field of spraying equipment. Background Technology

[0002] With the development of the feed and food industries both domestically and internationally, the nutritional composition, appearance, and taste of food and feed are receiving increasing attention. Often, after drying, feed and food industry pellets need to be coated with oils or trace elements; this work is typically done using a vacuum spraying machine.

[0003] Traditional vacuum spraying machines include a horizontal cylindrical body with a rotor inside the body for stirring materials. The rotor includes a stirring shaft coaxial with the cylindrical body. Multiple radially extending support rods are evenly fixed on the circumference of the stirring shaft, and blades are fixed to the free ends of each support rod. The blades are typically inclined at a 45° angle to the axis of the stirring shaft. Multiple rows of liquid inlets are located along the length of the upper part of the horizontal cylindrical body, and a vacuum port is located on the upper part of the horizontal cylindrical body opposite to the liquid inlets.

[0004] The material enters the inner cavity of the cylinder, and the spraying liquid is sprayed onto the material through various liquid inlets. The material falling to the bottom of the cylinder is repeatedly stirred and lifted by the paddles, distributing evenly within the cylinder while being sprayed with the spraying liquid. Then, a vacuum is created inside the cylinder through the vacuum port, resulting in a vacuum state inside both the cylinder and the material. After the vacuum is created, it is released. During the release process, the spraying liquid on the surface of the material is evenly forced into the material under atmospheric pressure, ensuring the best spraying effect.

[0005] The drawbacks of traditional vacuum spraying machines are: while they can ensure thorough mixing during operation, the gap between the blades and the inner wall of the cylinder cannot be adjusted, causing material particles embedded in the gap to become trapped and wear out; furthermore, the angle of the blades relative to the axis of the mixing shaft cannot be changed. When producing materials with larger particle sizes, the materials are easily sheared by the inclined edge of the blades during the mixing process, resulting in excessive fragments in the material, increased powderiness, and affecting the product's appearance and selling price. Utility Model Content

[0006] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, and such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0007] In view of the problems existing in the above and / or prior art, this utility model is proposed.

[0008] The purpose of this invention is to overcome the problem of excessive breakage and wear of large-diameter material particles during the mixing process in the prior art, and to provide a vacuum spraying machine that reduces the shear force on the material, enables stable and uniform mixing of the material, significantly reduces the generation of broken material, thereby ensuring the quality of the material and improving production efficiency.

[0009] To solve the above technical problems, this utility model provides a vacuum spraying machine, including a horizontal cylinder. The inner cavity of the cylinder is provided with a stirring shaft coaxial with it. Radially outwardly extending support rods are fixed on the circumference of the stirring shaft. The free ends of each support rod are respectively fixed with main blades. The main blades with the same phase are jointly fixed on an integral main plate. Each main plate extends along the entire length of the cylinder and is parallel to the axis of the stirring shaft.

[0010] Furthermore, the main landing plate is provided with multiple rows of waist-shaped grooves extending radially along the cylinder, and the main blades are fixedly connected to the main landing plate by bolts passing through the waist-shaped grooves.

[0011] Furthermore, the main lifting plate has a chamfer on its outer edge near the inner wall of the cylinder, and the end of the chamfer has an arc-shaped head.

[0012] Furthermore, the angle between the bevel of the chamfer and the plane of the main plate is 20°.

[0013] Furthermore, the gap between the main lifting plate and the inner wall of the cylinder is 3-5mm.

[0014] Furthermore, each of the support rods has an auxiliary blade fixed to its middle section. The auxiliary blades with the same phase are fixed together on an integral auxiliary lifting plate. Each auxiliary lifting plate extends along the entire length of the cylinder and is parallel to the axis of the stirring shaft.

[0015] Furthermore, four rows of support rods are evenly distributed on the circumference of the stirring shaft, corresponding to four main lifting plates, with a phase difference of 90° between adjacent main lifting plates.

[0016] Furthermore, the top center of the cylinder is provided with a feed inlet, the upper part of the cylinder is provided with multiple rows of liquid addition ports along the length direction, a vacuum port is provided on the side opposite to the liquid addition ports, the bottom of the cylinder is provided with a discharge port, a hopper is connected below the discharge port, and the stirring shaft is directly driven by a geared motor.

[0017] Furthermore, the top of the cylinder is also provided with a powder addition port.

[0018] Compared to existing technologies, the advantages or beneficial effects of this invention include at least the following: by setting an integrated main and auxiliary lifting plate parallel to the cylinder axis, shearing of material particles is avoided during stirring. This effectively reduces material trapping and breakage, helping customers to produce more conveniently and efficiently, resulting in more uniform mixing, better material coating, improved production efficiency, and reduced labor costs. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments 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. The drawings are provided for reference and illustration only and are not intended to limit this utility model. Wherein: Figure 1 This is a front view of the vacuum spraying machine of this utility model; Figure 2 for Figure 1 The right view; Figure 3 for Figure 1 Top view; Figure 4 This is a front view of the rotor in this utility model; Figure 5 This is an end view of the rotor in this utility model; Figure 6 This is a perspective view of the rotor in this utility model; Reference numerals: 1. Cylinder; 1a. Feed inlet; 1b. Liquid inlet; 1c. Powder inlet; 1d. Vacuum inlet; 2. Gear motor; 3. Stirring shaft; 4. Support rod; 5. Main impeller; 6. Main lifter plate; 6a. Waist-shaped groove of main lifter plate; 7. Auxiliary impeller; 8. Auxiliary lifter plate; 9. Compressed air tank; 10. Discharge hopper. Detailed Implementation

[0020] To make the technical means, creative features, achieved objectives and effects of this utility model easier to understand, the present utility model will be further described below with reference to specific illustrations. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0022] like Figures 1 to 6 As shown, the vacuum spraying machine of this utility model includes a horizontal cylinder 1. A feed inlet 1a is located at the center of the top of the cylinder 1, and a powder inlet 1c is located on one side of the feed inlet 1a. Multiple rows of liquid inlets 1b are located along the length of the upper part of the cylinder 1. At least two vacuum ports 1d are located on the upper part of the cylinder 1 opposite to the liquid inlets 1b. A discharge port is located at the center of the bottom of the cylinder 1, and a hopper 10 is connected below the discharge port. The inner cavity of the cylinder 1 is equipped with a rotor for stirring materials. The rotor includes a stirring shaft 3 coaxial with the cylinder 1, and one end of the stirring shaft 3 is directly driven by a geared motor 2.

[0023] Multiple radially extending support rods 4 are evenly fixed on the circumference of the stirring shaft 3. Each support rod 4 has a main blade 5 fixed to its free end. Each main blade 5 is parallel to the axis of the stirring shaft 3. Each main blade 5 with the same phase is fixed to the integral main lifting plate 6 by bolts. Each main lifting plate 6 extends along the entire length of the cylinder 1 and is parallel to the axis of the stirring shaft 3. The outer edge of the main lifting plate 6 is close to the inner wall of the cylinder 1.

[0024] Each main blade 6 is provided with multiple rows of main blade waist-shaped grooves 6a extending radially along the cylinder 1. The fixing bolts of the main blade 5 pass through the main blade waist-shaped grooves 6a, which facilitates the adjustment of the gap between the outer edge of the main blade 5 and the inner wall of the cylinder 1.

[0025] Typically, a row of support rods 4 is set on each of the four phases of the circumference of the stirring shaft 3, so that the rotor has four main lifting plates 6, and the phase difference between adjacent main lifting plates 6 is 90°.

[0026] Each main lifting plate 6 has a chamfered edge near the inner wall of the cylinder 1. The angle between the chamfered edge and the plane of the main lifting plate 6 is preferably 20°, and the end of the chamfer has an arc-shaped head to avoid damaging the material. The gap between each main lifting plate 6 and the inner wall of the cylinder 1 is controlled at 3-5mm to ensure that the outer edge of the main lifting plate 6 does not stick to the material.

[0027] Each support rod 4 has a secondary blade 7 fixed in the middle section. Each secondary blade 7 with the same phase is fixed to the integral secondary lifting plate 8 by bolts to improve the stirring effect. Each secondary lifting plate 8 extends along the entire length of the cylinder 1 and is parallel to the axis of the stirring shaft 3.

[0028] A compressed air chamber 9 is provided on one side of the cylinder 1 to provide compressed air to each cylinder and pneumatic valve, and to purge the area below the discharge port after material feeding to prevent material accumulation.

[0029] When the geared motor 2 drives the stirring shaft 3 to rotate, the material enters the inner cavity of the cylinder 1 through the feed port 1a at the top center of the cylinder 1. The spraying liquid is sprayed onto the material through the liquid addition ports 1b. Some materials can also be added as powder through the powder addition port 1c. The material falling to the bottom of the cylinder 1 is repeatedly stirred and lifted by the rotor. During the stirring process, each support rod 4 drives each main lifting plate 6 and auxiliary lifting plate 8 to rotate around the axis of the stirring shaft 3. The main lifting plate 6 and auxiliary lifting plate 8 work together to improve the mixing uniformity of the material, which is sprayed with the spraying liquid while being stirred. During the stirring process, the main lifting plate 6 and auxiliary lifting plate 8 only play a stirring role and do not have sharp edges to shear and damage the material, greatly reducing material breakage or wear. Then, the inner cavity of the cylinder 1 is evacuated through the vacuum port 1d, making the inside of the cylinder 1 a vacuum state, and the inside of the material is also a vacuum state. After the vacuum is evacuated, it is released. During the vacuum release process, the spraying liquid on the surface of the material is evenly pressed into the inside of the material under atmospheric pressure, ensuring the spraying effect. Finally, the material is discharged.

[0030] The above description is merely a preferred embodiment of the present utility model, showing and describing the basic principles, main features, and advantages of the present utility model. It is not intended to limit the scope of patent protection of the present utility model. Those skilled in the art should understand that the present utility model is not limited to the above embodiments. In addition to the above embodiments, the present utility model may have other implementations without departing from the spirit and scope of the present utility model. Various changes and improvements to the present utility model are also possible. All technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of protection claimed by the present utility model. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents. Technical features not described in the present utility model can be implemented by or using existing technology, and will not be elaborated here.

Claims

1. A vacuum spraying machine, comprising a horizontal cylinder (1), wherein the inner cavity of the cylinder (1) is provided with a stirring shaft (3) coaxial with it, and a radially outwardly extending support rod (4) is fixed on the circumference of the stirring shaft (3), characterized in that: Each of the support rods (4) has a main blade (5) fixed to its free end. The main blades (5) with the same phase are fixed together on the integral main plate (6). Each main plate (6) extends along the entire length of the cylinder (1) and is parallel to the axis of the stirring shaft (3).

2. The vacuum spraying machine according to claim 1, characterized in that: The main landing plate (6) is provided with multiple rows of main landing plate waist-shaped grooves (6a) extending radially along the cylinder (1), and the main blade (5) is fixedly connected to the main landing plate (6) by bolts passing through the main landing plate waist-shaped grooves (6a).

3. The vacuum spraying machine according to claim 1, characterized in that: The main plate (6) has a chamfer on the outer edge near the inner wall of the cylinder (1), and the end of the chamfer has an arc-shaped head.

4. The vacuum spraying machine according to claim 3, characterized in that: The angle between the hypotenuse of the chamfer and the plane of the main plate (6) is 20°.

5. The vacuum spraying machine according to claim 1, characterized in that: The gap between the main plate (6) and the inner wall of the cylinder (1) is 3-5mm.

6. The vacuum spraying machine according to claim 1, characterized in that: Each of the support rods (4) has a secondary blade (7) fixed in the middle section. The secondary blades (7) with the same phase are fixed together on the integral secondary scraper plate (8). Each secondary scraper plate (8) extends along the entire length of the cylinder (1) and is parallel to the axis of the stirring shaft (3).

7. The vacuum spraying machine according to claim 1, characterized in that: The stirring shaft (3) has four rows of support rods (4) evenly distributed around its circumference, and four main scraping plates (6) are set accordingly. The phase difference between adjacent main scraping plates (6) is 90°.

8. The vacuum spraying machine according to any one of claims 1 to 7, characterized in that: The top center of the cylinder (1) is provided with a feed inlet (1a), the upper part of the cylinder (1) is provided with multiple rows of liquid addition ports (1b) along the length direction, the side opposite to the liquid addition port (1b) is provided with a vacuum port (1d), the bottom of the cylinder (1) is provided with a discharge port, and a feeding hopper (10) is connected below the discharge port. The stirring shaft (3) is directly driven by a geared motor (2).

9. The vacuum spraying machine according to claim 8, characterized in that: The top of the cylinder (1) is also provided with a powder addition port (1c).

Images