Pneumatic mixing device

Abstract

The utility model discloses a pneumatic mixing device. The pneumatic mixing device comprises a discharge hopper, an air chamber, an injection disc, a conical valve and a valve jacking device, the discharging hopper is arranged at the bottom of the stock bin, the air cavity is arranged on the periphery of the discharging hopper, and an air storage interlayer is formed between the air cavity and the outer wall of the discharging hopper. The injection disc is embedded in the middle of the inverted circular truncated cone discharging part, and a plurality of pulse nozzles are distributed on the injection disc in the circumferential direction; each pulse nozzle comprises a spraying hole and a pulse electromagnetic valve; the pulse electromagnetic valves can enable the corresponding spraying holes to form pulse airflow spraying; the conical valve is arranged in the discharging hopper, the pinnacle end of the conical valve extends into the bottom of the stock bin, and the circular bottom edge is in sealed sliding connection with an injection disc or a circular truncated cone discharging part located below the spraying hole; the valve jacking device can jack the conical valve upwards. Compressed air is introduced to form obliquely upward airflow, and the airflow is lifted upwards along the conical valve and falls back under gravity, so that the mixing efficiency is improved, large-batch material mixing within 70 m < 3 > can be realized, and the duration time of the whole mixing process does not exceed 10 min.

Description

Technical Field

[0001] The utility model relates to a material mixing device, in particular to a pneumatic mixing device. Background Art

[0002] In the industrial production process, it is often necessary to go through the process of mixing a large number of fluid materials, that is, to mix a batch of fluid materials uniformly to ensure that the quality of each material is the same when it is finally packaged. This requires large-scale mixing equipment, and the existing traditional mechanical mixers, such as the mixing and mixing by stirring parts, still have the following deficiencies, which need to be improved:

[0003] 1. The volume of materials mixed at one time is small. Due to the limitation of the existing motor power, it can only reach 40m3 at most. 3 .

[0004] 2. Due to mechanical stirring, a long mixing time is required to achieve uniform mixing, even more than several hours, and the mixing efficiency is poor.

[0005] 3. To achieve uniform mixing of materials, the stirring parts are arranged along the axial direction and exceed half of the axial length of the silo. Therefore, when encountering abrasive materials, the longer stirring parts interact with the materials, which will not only reduce the life of the mixer, but also cause pollution to the materials due to corrosion of the stirring parts. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide a pneumatic mixing device in view of the shortcomings of the above-mentioned prior art, which forms an oblique upward airflow by introducing compressed air, and lifts it upward along the conical valve, and falls back due to gravity, thereby improving the mixing efficiency and achieving 70m 3 Large batches of materials can be mixed within 10 minutes, and the entire mixing process will not last more than 10 minutes.

[0007] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0008] A pneumatic mixing device comprises a discharge hopper, an air chamber, an injection plate, a cone valve and a valve lifting device.

[0009] The discharge hopper is arranged at the bottom of the silo, and comprises a frustum-shaped discharge part and a discharge port coaxially arranged at the bottom of the frustum-shaped discharge part.

[0010] The air chamber is arranged on the outer periphery of the discharge hopper and forms a sealed air storage interlayer with the outer wall of the discharge hopper; high-pressure compressed air is stored in the air storage interlayer.

[0011] The injection disk is embedded in the middle of the discharging part of the inverted frustum, and a plurality of pulse nozzles are arranged along the circumference of the injection disk; each pulse nozzle includes a spray hole and a pulse solenoid valve; wherein the spray holes can be connected with the air storage interlayer; the pulse solenoid valve can make the corresponding spray holes form a pulse airflow injection.

[0012] The conical valve is arranged in the discharge hopper, the pointed top of the conical valve extends into the bottom of the silo, and the circular bottom edge of the conical valve is sealingly and slidingly connected with the injection disk or the truncated table discharge part located below the spray hole.

[0013] The valve lifting device can lift the conical valve upward.

[0014] Each spray hole is inclined toward the conical generatrix of the conical valve.

[0015] The angle A between the central axis of each nozzle and the vertical line is -5~10°.

[0016] The number of pulse nozzles is 10~20.

[0017] The opening time of each pulse solenoid valve in each pulse cycle is shorter than the closing time; two adjacent pulse solenoid valves are opened alternately in a cycle.

[0018] Each pulse cycle of each pulse solenoid valve shall not exceed 10s.

[0019] The valve lifting device is a lifting cylinder.

[0020] The bottom of the lifting cylinder is installed on the injection disk or the truncated cone discharge part below the spray hole through the mounting bottom plate, and a plurality of discharge cavities are arranged circumferentially on the outer periphery of the mounting bottom plate; a lifting plate is arranged on the top of the piston of the lifting cylinder, and the lifting plate cooperates with the inner wall of the conical valve.

[0021] The conical valve also includes a guide guard plate and a sliding plate; the sliding plate is arranged on the inner wall surface of the conical valve, located directly above the discharge cavity and arranged horizontally; the guide guard plate is arranged on the top surface of the mounting base plate on the inner side of the discharge cavity; the outer wall surface of the guide guard plate is slidably matched with the inner wall surface of the sliding plate; the height of the guide guard plate is greater than the lifting stroke of the lifting cylinder.

[0022] A pressure sensor is arranged in the gas storage interlayer.

[0023] The utility model has the following beneficial effects:

[0024] 1. This application can achieve large batch material mixing, such as 70m 3 Mixing of materials within.

[0025] 2. The present application forms an upward oblique airflow by introducing compressed air, and lifts it upward along the conical valve, and falls back due to gravity, thereby improving the mixing efficiency. The entire mixing process of the present application will not last more than 10 minutes. The larger mechanical mixer greatly shortens the mixing time while also reducing energy consumption and reducing the wear of the equipment by the material.

[0026] 3. This application uses a pulse solenoid valve to achieve instantaneous high-speed movement of airflow to improve the mixing effect.

[0027] 4. This application can be applied to various powder / granular materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram showing the installation position and airflow direction of a pneumatic mixing device of the utility model.

[0029] Figure 2 An overall three-dimensional line drawing of a pneumatic mixing device of the utility model is shown.

[0030] Figure 3 A two-dimensional line drawing of a longitudinal section of a pneumatic mixing device of the utility model is shown.

[0031] Figure 4 A three-dimensional longitudinal section of a pneumatic mixing device of the utility model is shown.

[0032] Among them are:

[0033] 10. Material silo; 11. Dust removal and filtering device; 12. Cylindrical material storage section; 13. Frustum storage section;

[0034] 20. Discharge hopper; 21. Discharge part of inverted round table; 22. Discharge port;

[0035] 30. Air chamber; 31. Air storage interlayer; 32. Compressed air inlet; 33. Pressure sensor;

[0036] 40. Injection plate; 41. Spray hole; 42. Pulse solenoid valve;

[0037] 50. Conical valve; 51. Guide guard plate; 52. Sliding plate;

[0038] 60. Valve lifting device; 61. Lifting plate; 62. Lifting cylinder; 63. Mounting base plate; 64. Discharge chamber. DETAILED DESCRIPTION

[0039] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific preferred embodiments.

[0040] In the description of the present invention, it should be understood that the terms "left side", "right side", "upper part", "lower part", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. "First", "second", etc. do not indicate the importance of the components, and therefore cannot be understood as a limitation on the present invention. The specific dimensions used in this embodiment are only for illustrating the technical solution, and do not limit the scope of protection of the present invention.

[0041] like Figure 1 As shown, a pneumatic mixing device is arranged at the bottom of a silo 10, and the volume of the silo 10 is 14m 3 Up to 111m 3 A dust removal and filtering device 11 is preferably provided on the top of the silo, and the silo includes a cylindrical storage portion 12 and a frustum storage portion 13 which are integrally arranged from top to bottom.

[0042] like Figure 2 , Figure 3 and Figure 4 As shown, a pneumatic mixing device includes a discharge hopper 20, an air chamber 30, an injection disk 40, a conical valve 50 and a valve lifting device 60.

[0043] The discharge hopper is arranged at the bottom of the frustum storage part, and comprises a frustum discharge part 21 and a discharge port 22 coaxially arranged at the bottom of the frustum discharge part.

[0044] The air chamber is arranged at the outer periphery of the discharge hopper, and forms a sealed air storage interlayer 31 with the outer wall of the discharge hopper.

[0045] The air chamber is preferably a cylindrical tube, and the top is preferably connected to the outer periphery of the bottom of the truncated cone storage part by a flange; the side wall of the air chamber is provided with a compressed air inlet 32 ​​and a pressure sensor 33. The compressed air inlet is used to pass high-pressure compressed air into the air storage interlayer; the pressure sensor is used to detect the air pressure in the air storage interlayer.

[0046] The injection disk is embedded in the middle of the inverted truncated cone discharge portion, and the inner wall surface of the injection disk is preferably flush with the inner wall surface of the truncated cone discharge portion, that is, it is in the shape of an inverted truncated cone.

[0047] The injection disk is provided with a plurality of pulse nozzles along the circumferential direction, preferably 10 to 20; each pulse nozzle comprises a spray hole 41 and a pulse solenoid valve 42.

[0048] The above-mentioned nozzles can all be connected to the gas storage interlayer, and each nozzle is preferably inclined toward the conical generatrix direction of the conical valve; each nozzle is preferably a direct current spray, and since the outlet divergence angle of the jet is not less than 20°, the angle A between the central axis of each nozzle and the vertical line is preferably -5~10°, and is further preferably a positive value.

[0049] The pulse solenoid valve can form a pulse airflow jet at the corresponding nozzle, and each pulse cycle of each pulse solenoid valve is preferably no more than 10s. Furthermore, the opening time of each pulse solenoid valve in each pulse cycle is less than the closing time; two adjacent pulse solenoid valves are opened alternately in a cycle. In this embodiment, the opening time of each pulse solenoid valve in each pulse cycle is 2s, and the closing time is 5s.

[0050] The conical valve is arranged in the discharge hopper, the pointed top of the conical valve extends into the bottom of the silo, and the circular bottom edge of the conical valve is sealed and slidably connected with the injection disk or the truncated cone discharge part located below the spray hole. In this embodiment, the cone angle of the conical valve is preferably 20-30°, and the generatrix length is preferably 0.6-1m, so that the volume is small and will not cause pollution to the material.

[0051] The conical valve preferably further comprises a guide guard plate 51 and a sliding plate 52; the sliding plate is arranged on the inner wall surface of the conical valve, preferably arranged horizontally.

[0052] The valve lifting device can lift the conical valve upward.

[0053] The valve lifting device is preferably a lifting cylinder 62; the bottom of the lifting cylinder is installed on the injection disk or the conical discharge part below the spray hole through the mounting base plate 63, and a plurality of discharge cavities 64 are arranged circumferentially on the outer periphery of the mounting base plate, preferably located directly below the sliding plate; a lifting plate 61 is provided on the top of the piston of the lifting cylinder, and the lifting plate cooperates with the inner wall of the conical valve.

[0054] The guide guard plate is arranged on the top surface of the installation bottom plate inside the discharge wall; the outer wall surface of the guide guard plate is slidably matched with the inner wall surface of the sliding plate; the height of the guide guard plate is greater than the lifting stroke of the lifting cylinder.

[0055] As an alternative, the valve lifting device may also adopt other lifting devices known in the prior art, such as a motor or an electric cylinder.

[0056] The working principle of a pneumatic mixing device preferably includes the following steps.

[0057] Step 1: Feeding: The material can be fed into the silo by pneumatic conveying or feeding, and the volume of the material shall not exceed 70% of the total volume of the silo.

[0058] Step 2, start the pulse nozzle: divide the pulse nozzles in the injection plate into two groups, and the two groups of pulse nozzles are arranged alternately, namely pulse nozzle group one and pulse nozzle group two.

[0059] Step 2-1, start the pulse nozzle group 1: open all the pulse solenoid valves corresponding to the pulse nozzle group 1, and perform pulse injection according to the set pulse frequency. In this embodiment, all of them are opened for 2s.

[0060] Step 2-2, start the pulse nozzle group 2: close the pulse nozzle group 1 for 5 seconds; after the pulse nozzle group 1 is closed, it is preferred to replenish air at an interval of 3 seconds, and then open the pulse nozzle group 2 for 2 seconds.

[0061] Step 2-3: Repeat step 2-1 to step 2-2 to make the two groups of pulse nozzles operate alternately in a cycle.

[0062] Step 3, mixing: When the corresponding pulse solenoid valve is opened, each pulse nozzle sprays the compressed air in the air storage interlayer into the discharge hopper above the injection plate at high pressure and high speed, carrying the materials in the discharge hopper and silo, and making turbulent upward movement along the conical surface of the conical valve. The surrounding materials will fall to the vicinity of the nozzle due to gravity and then be carried up by the compressed air for mixing. The specific airflow and material mixing flow diagram is shown in the figure below. Figure 1 shown.

[0063] The entire mixing process will not last more than 10 minutes. Larger mechanical mixers greatly shorten the mixing time and also reduce energy consumption.

[0064] Step 4, discharging: After the mixing effect is achieved, the lifting cylinder is started, the lifting plate pushes the cone valve upward, and the sliding plate at the bottom of the cone valve slides with the outer wall of the guide guard plate to guide the lifting of the cone valve; the lifting cylinder further lifts to create a discharge gap between the cone valve and the discharging part of the inverted frustum. At this time, the material in the silo will fall along the discharge gap and the discharge cavity on the outer periphery of the injection plate to the discharge port, and be discharged from the discharge port. The setting of the guide guard plate can also prevent the falling powder from polluting the lifting cylinder and other parts with dust.

[0065] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various equivalent transformations can be made to the technical scheme of the present invention, and these equivalent transformations all belong to the protection scope of the present invention.

Claims

1. A pneumatic mixing device, characterized in that: It includes a discharge hopper, an air chamber, an injection plate, a conical valve and a valve lifting device; the discharge hopper is arranged at the bottom of the silo, and includes a frustum-shaped discharge part and a discharge port coaxially arranged at the bottom of the frustum-shaped discharge part; The air chamber is arranged on the outer periphery of the discharge hopper, and forms a sealed air storage interlayer with the outer wall of the discharge hopper; the air storage interlayer stores high-pressure compressed air; The injection plate is embedded in the middle of the discharging part of the inverted truncated table, and a plurality of pulse nozzles are arranged along the circumference of the injection plate; each pulse nozzle includes a spray hole and a pulse solenoid valve; wherein the spray holes can be connected with the gas storage interlayer; the pulse solenoid valve can make the corresponding spray holes form a pulse airflow injection; The conical valve is arranged in the discharge hopper, the pointed top of the conical valve extends into the bottom of the silo, and the circular bottom edge of the conical valve is sealingly and slidably connected with the injection disk or the truncated table discharge part located below the spray hole; The valve lifting device can lift the conical valve upward.

2. The pneumatic mixing device according to claim 1, characterized in that: Each spray hole is inclined toward the conical generatrix of the conical valve.

3. The pneumatic mixing device according to claim 2, characterized in that: The included angle A between the central axis of each spray hole and the vertical line is -5 to 10 degrees.

4. The pneumatic mixing device according to claim 1, characterized in that: The number of pulse nozzles is 10 to 20.

5. The pneumatic mixing device according to claim 1, characterized in that: The opening time of each pulse solenoid valve in each pulse cycle is shorter than the closing time; two adjacent pulse solenoid valves are opened alternately in a cycle.

6. The pneumatic mixing device according to claim 1, characterized in that: Each pulse cycle of each pulse solenoid valve shall not exceed 10s.

7. The pneumatic mixing device according to claim 1, characterized in that: The valve lifting device is a lifting cylinder.

8. The pneumatic mixing device according to claim 7, characterized in that: The bottom of the lifting cylinder is installed on the injection disk or the truncated cone discharge part below the spray hole through the mounting bottom plate, and a plurality of discharge cavities are arranged circumferentially on the outer periphery of the mounting bottom plate; a lifting plate is arranged on the top of the piston of the lifting cylinder, and the lifting plate cooperates with the inner wall of the conical valve.

9. The pneumatic mixing device according to claim 8, characterized in that: The conical valve also includes a guide guard plate and a sliding plate; the sliding plate is arranged on the inner wall surface of the conical valve, located directly above the discharge cavity and arranged horizontally; the guide guard plate is arranged on the top surface of the mounting base plate on the inner side of the discharge cavity; the outer wall surface of the guide guard plate is slidably matched with the inner wall surface of the sliding plate; the height of the guide guard plate is greater than the lifting stroke of the lifting cylinder.

10. The pneumatic mixing device according to claim 1, characterized in that: A pressure sensor is arranged in the gas storage interlayer.

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