Collision type jet mill with double Venturi tubes

Abstract

The utility model belongs to the technical field of powder production, and particularly relates to a double-Venturi-tube collision type jet mill which comprises a smashing cavity and a material distributing cavity formed in the top of the smashing cavity, Venturi tube assemblies are arranged on the two sides of the smashing cavity, material guiding tubes communicated with the Venturi tube assemblies are arranged on the Venturi tube assemblies, and a material bearing shell is arranged on the tops of the material guiding tubes. The Venturi tube assembly comprises a feeding section communicated with the material guiding tube, a contraction section is arranged at one end of the feeding section, a throat part is installed at the end, away from the feeding section, of the contraction section, a spiral pre-smashing tube is installed on one side of the throat part, a discharging section is installed at the end, away from the throat part, of the spiral pre-smashing tube, and the inner diameter of the spiral pre-smashing tube is gradually decreased. And crushing bulges are arranged on the inner wall of the spiral pre-crushing pipe. By means of the device, materials can be preliminarily smashed before entering the smashing cavity, the burden of the smashing cavity is relieved, the overall energy utilization rate is increased, meanwhile, the material treatment speed is increased, and therefore the production efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the powder production technical field, specifically relates to a double Venturi pipe collision type jet mill. BACKGROUND

[0002] In modern industrial production, fine crushing of materials is a crucial process, which is widely used in many fields such as chemical industry, medicine, mineral, electronics and so on. With the continuous progress of technology and the increasing demand for high-quality, fine materials, the research and development of high-efficiency, high-quality crushing equipment becomes particularly critical.

[0003] As a new crushing method, air flow crushing technology has gradually received widespread attention and application due to its unique principles and advantages. For example, the authorized announcement number CN206793847U describes a collision type jet mill, which realizes the convection of gas by setting a Laval nozzle. However, the material is only impacted and crushed by a single high-speed airflow, which can refine the material to a certain extent, but the crushing effect is often not ideal and cannot meet higher fineness requirements.

[0004] In addition, the single crushing method makes the collision and interaction of materials in the crushing chamber insufficient, resulting in insufficient refinement and uniformity of material particles. At the same time, due to the lack of effective pre-crushing link, the material directly enters the crushing chamber, which brings a large burden to the crushing chamber, not only affecting the service life of the equipment, but also limiting the overall processing capacity and efficiency.

[0005] Therefore, we propose a double Venturi pipe collision type jet mill, which not only allows the material to be preliminarily crushed before entering the crushing chamber, reducing the burden on the crushing chamber and improving the overall energy utilization rate, but also speeds up the material processing speed, thereby improving the production efficiency. Secondly, compared with the traditional single crushing method, the utility model can more effectively utilize airflow energy and reduce unnecessary energy loss. Utility model content

[0006] The utility model aims to provide a double Venturi pipe collision type jet mill, which not only allows the material to be preliminarily crushed before entering the crushing chamber, reducing the burden on the crushing chamber and improving the overall energy utilization rate, but also speeds up the material processing speed, thereby improving the production efficiency. Secondly, compared with the traditional single crushing method, the utility model can more effectively utilize airflow energy and reduce unnecessary energy loss.

[0007] The technical scheme adopted by the utility model is as follows:

[0008] A double Venturi pipe collision type airflow mill, including a crushing cavity and a distribution cavity arranged at the top of the crushing cavity, Venturi pipe assemblies are arranged on both sides of the crushing cavity, guide pipes are arranged on the Venturi pipe assemblies and communicate with the Venturi pipe assemblies, material bearing housings are arranged at the top of the guide pipes;

[0009] The Venturi pipe assembly comprises an inlet section in communication with the guide pipe, a contraction section is arranged at one end of the inlet section, a throat is mounted at the end of the contraction section away from the inlet section, a spiral pre-crushing pipe is mounted on one side of the throat, a discharge section is mounted at the end of the spiral pre-crushing pipe away from the throat, the inner diameter of the spiral pre-crushing pipe decreases from large to small, and crushing protrusions are arranged on the inner wall of the spiral pre-crushing pipe.

[0010] Further, the guide pipe is provided with a control valve.

[0011] Further, a fan is arranged on the inlet section.

[0012] Further, a discharge pipe is arranged at the bottom of the crushing cavity.

[0013] Further, a filter plate is arranged inside the distribution cavity.

[0014] Further, a motor and a discharge port are arranged outside the distribution cavity, and a grading wheel is mounted at the output end of the motor.

[0015] The utility model achieves the following technical effects:

[0016] The material is first placed in the material carrying shell, enters the material inlet end of the Venturi tube assembly through the material guide pipe, in the Venturi tube assembly, the material enters the converging section smoothly along with the airflow through the material inlet section, the pipe diameter of the converging section gradually decreases, according to Bernoulli's principle, the airflow speed sharply increases, and the pressure significantly decreases, the high-speed airflow carries the material to accelerate at a very high speed, when the material enters the throat, the airflow speed reaches the maximum value, the material particles obtain huge kinetic energy in the high-speed airflow, then, the material enters the spiral pre-pulverizing pipe, because the inner diameter of the spiral pre-pulverizing pipe gradually decreases from large to small, the flow space of the material is gradually compressed in the process of forward movement, which causes the material to be extruded between each other and subjected to shearing action from the pipe wall, at the same time, the material frequently collides and rubs with the crushing protrusions on the inner wall of the spiral pre-pulverizing pipe, under these multiple actions, the material realizes preliminary pulverization and refinement, the material treated through the spiral pre-pulverizing pipe is sprayed out from the discharge section at a high speed, enters the pulverizing cavity with a very high speed and energy, because the Venturi tube assemblies are arranged on both sides of the pulverizing cavity, the material flows sprayed out from the discharge sections on both sides collide with each other in the pulverizing cavity, at the moment of collision, the material particles produce strong impact and collision between each other, further break the structure of the material particles, and make the material particles more refined and uniform, in the process of collision, the movement direction and speed of the material particles change sharply, the originally larger particles are further broken into smaller particles under the strong interaction, and the collision and friction between different particles also make the shape of the particles more regular and the surface more smooth, the material separation cavity is used for separating and collecting the material treated through the pulverization, and collects the fine particle material meeting the requirements, so that subsequent processing or use is facilitated. The device not only can make the material preliminarily pulverized before entering the pulverizing cavity, reduces the burden of the pulverizing cavity, improves the overall energy utilization rate, and speeds up the material processing speed, thereby improving the production efficiency, and secondly, compared with the traditional single pulverization mode, the device can more effectively utilize the airflow energy and reduce unnecessary energy loss. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is the overall structure schematic diagram of the utility model;

[0018] Figure 2 is the front view of the utility model;

[0019] Figure 3 is the structure schematic diagram of the Venturi tube assembly of the utility model;

[0020] Figure 4 is the structure schematic diagram of the spiral pre-pulverizing pipe of the utility model;

[0021] Figure 5 is the structure schematic diagram of the grading wheel of the utility model.

[0022] The attached diagram lists the components represented by each number as follows:

[0023] 1. Crushing chamber; 2. Distributing chamber; 3. Guide pipe; 4. Material bearing shell; 5. Feeding section; 6. Shrinkage section; 7. Throat; 8. Spiral pre-crushing pipe; 9. Discharge section; 10. Crushing protrusion; 11. Control valve; 12. Fan; 13. Discharge pipe; 14. Filter plate; 15. Motor; 16. Discharge port; 17. Grading wheel. Detailed Implementation

[0024] To make the purpose and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the following text is merely used to describe one or more specific implementations of this utility model and does not strictly limit the scope of protection specifically claimed by this utility model.

[0025] like Figures 1-5 As shown, the technical solution adopted in this utility model is as follows: A double Venturi tube collision type airflow mill includes a crushing chamber 1 and a material distribution chamber 2 set at the top of the crushing chamber 1. Venturi tube assemblies are provided on both sides of the crushing chamber 1. A guide pipe 3 communicating with the Venturi tube assembly is provided on the Venturi tube assembly. A material carrying shell 4 is provided at the top of the guide pipe 3.

[0026] The venturi tube assembly includes an inlet section 5 connected to the feed tube 3. One end of the inlet section 5 is provided with a constriction section 6. A throat 7 is installed at the end of the constriction section 6 away from the inlet section 5. A spiral pre-crushing tube 8 is installed on one side of the throat 7. A discharge section 9 is installed at the end of the spiral pre-crushing tube 8 away from the throat 7. The inner diameter of the spiral pre-crushing tube 8 decreases from large to small, and crushing protrusions 10 are provided on the inner wall of the spiral pre-crushing tube 8.

[0027] The feed pipe 3 is equipped with a control valve 11, which controls the quantitative entry of materials to prevent them from exceeding the processing range. The control valve 11 is an electric flow control valve 11B250, which is existing technology and will not be described in detail here.

[0028] Meanwhile, a blower 12 is installed on the feeding section 5. The blower 12 drives the airflow to transport materials. The blower 12 is a COPPUS blower 12 from the United States, which is existing technology and will not be described in detail here.

[0029] A discharge pipe 13 is provided at the bottom of the crushing chamber 1. The discharge pipe 13 allows excess material to be discharged when the chamber is not in operation, preventing material from accumulating inside the crushing chamber 1.

[0030] The material distribution chamber 2 is equipped with a filter plate 14. The filter plate 14 allows materials that meet the specifications to enter from above, while materials that do not meet the specifications fall into the crushing chamber 1.

[0031] The motor 15 is provided with a stepped wheel 17 at the output end, and the motor 15 is used as a power source to drive the stepped wheel 17 to rotate at high speed in the distribution cavity 2. The material is drawn into the distribution cavity 2 under the action of the fan 12, and interacts with the stepped wheel 17. The centrifugal force generated by the rotation of the stepped wheel 17 causes the coarse and fine particles in the material to separate. The fine particles may pass through the gap between the blades of the stepped wheel 17 into the subsequent collection system (such as a cyclone separator or dust collector) due to the small centrifugal force, while the coarse particles are thrown to the wall of the distribution cavity 2 due to the large centrifugal force, and finally discharged from the discharge port 16.

[0032] It should be noted that the setting of the cyclone separator, the setting of the stepped wheel 17, and the working principle and operating principle are all prior art, and will not be described in detail here.

[0033] The shape of the crushing protrusion 10 can be set according to actual conditions, such as a frosted surface, a circular protrusion, a triangular protrusion, or a trapezoidal protrusion, as long as the crushing effect is achieved.

[0034] The working principle of the utility model is: the material is first placed in the material bearing shell 4, enters the material inlet end of the venturi assembly through the material guide pipe 3, in the venturi assembly, the material enters the converging section 6 stably along with the airflow through the material inlet section 5, the pipe diameter of the converging section 6 gradually reduces, according to Bernoulli's principle, the airflow velocity sharply increases, and the pressure significantly reduces, this high-speed airflow carries the material to accelerate at a very high speed, when the material enters the throat 7, the airflow velocity reaches the maximum value, the material particles obtain huge kinetic energy in the high-speed airflow, then, the material enters the spiral pre-pulverizing pipe 8, because the inner diameter of the spiral pre-pulverizing pipe 8 gradually reduces from big to small, the flow space of the material is gradually compressed in the process of moving forward, which makes the material mutually extrude and is subjected to the shearing action from the pipe wall, at the same time, the material frequently collides and rubs with the crushing protrusions 10 on the inner wall of the spiral pre-pulverizing pipe 8, under these multiple actions, the material realizes preliminary pulverization and refinement, the material treated through the spiral pre-pulverizing pipe 8 is sprayed from the discharge section 9 at high speed, enters the pulverizing cavity 1 at a very high speed and energy, because the venturi assembly is arranged on both sides of the pulverizing cavity 1, the material streams sprayed from the discharge sections 9 on both sides collide with each other in the pulverizing cavity 1, at the moment of collision, the material particles produce strong impact and collision between each other, further break the structure of the material particles, make them more refined and uniform, in the process of collision, the movement direction and speed of the material particles sharply change, the originally larger particles are further broken into smaller particles under this strong interaction, and the collision and friction between different particles also make the shape of the particles more regular and the surface more smooth, the material separating cavity 2 is used for separating and collecting the material treated through the pulverization, collects the fine-particle material meeting the requirements, so as to be used for subsequent processing or use. The device not only can make the material preliminarily pulverized before entering the pulverizing cavity 1, reduces the burden of the pulverizing cavity 1, improves the overall energy utilization rate, and speeds up the material processing speed, thereby improving the production efficiency, secondly, compared with the traditional single pulverization mode, the utility model can more effectively utilize the airflow energy and reduce unnecessary energy loss.

[0035] The above only describes the preferred embodiments of the utility model, it should be pointed out that, for ordinary skilled person in the art, without departing from the principle of the utility model, can make several improvements and refinements, these improvements and refinements also should be regarded as the protection scope of the utility model. The structures, devices and operation methods not specifically described and explained in the utility model, such as no special description and limitation, are implemented according to the conventional means in the field.

Claims

1. A double Venturi tube collision type air jet mill, comprising a grinding chamber (1) and a material distribution chamber (2) disposed at the top of the grinding chamber (1), wherein Venturi tube assemblies are disposed on both sides of the grinding chamber (1), and a guide pipe (3) communicating with the Venturi tube assembly is disposed on the Venturi tube assembly, and a material carrying shell (4) is disposed at the top of the guide pipe (3). Its features are: The Venturi tube assembly includes an inlet section (5) connected to the feed tube (3). One end of the inlet section (5) is provided with a shrinkage section (6). A throat (7) is installed at the end of the shrinkage section (6) away from the inlet section (5). A spiral pre-crushing tube (8) is installed on one side of the throat (7). A discharge section (9) is installed at the end of the spiral pre-crushing tube (8) away from the throat (7). The inner diameter of the spiral pre-crushing tube (8) decreases from large to small, and crushing protrusions (10) are provided on the inner wall of the spiral pre-crushing tube (8).

2. The double Venturi tube impact-type air jet mill according to claim 1, characterized in that: A control valve (11) is provided on the feed pipe (3).

3. The double Venturi tube impact-type air jet mill according to claim 1, characterized in that: A blower (12) is installed on the feeding section (5).

4. The double Venturi tube impact-type air jet mill according to claim 1, characterized in that: The bottom of the crushing chamber (1) is provided with a discharge pipe (13).

5. The double Venturi tube impact-type air jet mill according to claim 1, characterized in that: The material distribution chamber (2) is equipped with a filter plate (14).

6. The double Venturi tube impact-type air jet mill according to claim 1, characterized in that: A motor (15) and a discharge port (16) are provided on the outside of the material distribution chamber (2), and a grading wheel (17) is installed at the output end of the motor (15).

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