Grading impeller structure of ultrafine grinder

Abstract

The utility model discloses a grading impeller structure of an ultrafine grinder, which comprises a winnowing chamber, a grinding chamber, a grading impeller arranged in the grinding chamber and a mechanical labyrinth seal arranged between the winnowing chamber and the grinding chamber, wherein the grading impeller comprises a bottom plate and a circle of main blades fixedly arranged on the bottom plate; the top of the main blade is further provided with a cleaning blade which extends into a groove of the mechanical labyrinth seal to form concave-convex seal and can rotate in the groove along with the grading impeller. The cleaning blades can rotate at a high speed along with the grading impeller and form concave-convex sealing with the groove of the mechanical labyrinth seal, so that materials with unqualified fineness in the winnowing chamber are strictly prevented from entering a finished product discharge port by mistake, and fine powder settled in a gap between the concave-convex labyrinth at the top can be cleaned by wind power generated in the high-speed rotating process. The blocking phenomenon caused by the fact that fine powder settled on the top is stacked and hardened in the operation process of the grading impeller is avoided.

Description

Technical Field

[0001] The utility model belongs to an ultrafine pulverizer, in particular to a grading impeller structure of an ultrafine pulverizer. Background Art

[0002] Ultrafine pulverizer is a kind of netless pulverizing equipment. Figure 1-Figure 2 As shown, it consists of a frame 1, a crushing spindle seat 2, a crushing chamber 3, a grading assembly 4, a screw conveyor feeder 5, a crushing spindle transmission mechanism and a grading transmission mechanism. The grading motor 6 and the screw conveyor feeder motor 7 are equipped with a variable frequency speed regulator, which can achieve long-distance stepless speed regulation.

[0003] Please combine Figure 3 As shown, the pulverizing chamber 3 contains a pulverizing disc 6, hammers 7, gear ring 8, and guide ring 9. The grading assembly 4 includes an air separation chamber 16, a grading impeller 10, a grading spindle 11, and a discharge port 12. The pulverizing disc 6 rotates as driven by a main motor 13 through a belt 14 to the pulverizing spindle 15. The grading assembly 4 is positioned above the pulverizing chamber 3, with the grading impeller 10 driven by the top grading motor 6. The discharge port of the grading assembly 4 is connected by a pipe to a dual centrifugal discharger, a pulse cloth dust filter, and a high-pressure blower.

[0004] The crushing disc 6 and the classifying impeller 10 are driven separately and independently, so that the crushing and classification are completed in one go, thus reducing the energy loss caused by over-crushing. The crushing fineness is controlled by the speed of the classifying impeller 10. The faster the classifying impeller 10 rotates, the higher the crushing fineness.

[0005] In the process of processing special aquatic feed, when it is necessary to ultrafinely grind some mixtures containing both low bulk density skin-like materials and high content of materials that are easy to adhere to and difficult to grind (such as seaweed, cottonseed meal, etc.), problems such as low grinding output and grinding fineness that do not meet the requirements may occur. Figure 4 As shown, after the improvement, the mechanical labyrinth seal 17 is used between the sorting chamber 16 and the crushing chamber 3, the crushing fineness and output are improved to a certain extent. However, the classifying impeller 10 sometimes has a concave and convex labyrinth at its top ( Figure 4 At point A (between the labyrinth groove and the top of the grading impeller), fine powder accumulated and hardened, causing it to become stuck, which in turn caused the machine to trip and shut down. To continue production, the grading mechanism had to be opened for maintenance and cleaning, which cost a lot of time and manpower. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide a superfine pulverizer grading impeller structure, which can prevent unqualified materials from entering the finished product discharge port by mistake in the strictly sealed air separation chamber through the mechanical labyrinth, and can also clean out the fine powder attached to the gap between the concave and convex labyrinths on the top of the grading impeller, thereby avoiding the jamming phenomenon caused by the accumulation and hardening of fine powder.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0008] A superfine pulverizer grading impeller structure includes an air separation chamber, a grinding chamber, a grading impeller arranged in the grinding chamber, and a mechanical labyrinth seal arranged between the air separation chamber and the grinding chamber. The grading impeller includes a bottom plate and a circle of main blades fixed to the bottom plate. The top of the main blade is also provided with a cleaning blade that extends into the groove of the mechanical labyrinth seal to form a concave-convex seal and can rotate in the groove with the grading impeller.

[0009] The number and arrangement positions of the cleaning blades on the top of the main blade correspond to and match the number of groove stages of the mechanical labyrinth seal.

[0010] Each main blade is provided with a sweeping blade on top.

[0011] The cleaning blade and the main blade are an integrated structure.

[0012] The grading impeller further comprises a fixing ring fixed on the inner edge of the main blade.

[0013] The outer edge of the fixing ring is provided with the same number of slots as the main blades, and the fixing ring is connected with the corresponding main blades through the slots and fixed by welding.

[0014] The utility model adopts a superfine pulverizer grading impeller structure. On the basis of mechanical labyrinth sealing, a cleaning impeller extending into the labyrinth groove is provided on the top of the main impeller of the grading impeller to form the convex part of the concave-convex labyrinth. When pulverizing ultrafine powder, the high-speed rotating grading impeller can not only strictly seal the air separation chamber to prevent unqualified materials from accidentally entering the finished product discharge port, but also effectively clean up the fine powder attached to the gap between the concave-convex labyrinth on the top of the grading impeller through the wind force generated by the top cleaning blades during the high-speed rotation process, thereby avoiding the jamming phenomenon caused by the accumulation and hardening of the fine powder attached to the top. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model is described in detail below with reference to the accompanying drawings and specific embodiments:

[0016] Figure 1 It is a structural diagram of the ultrafine pulverizer of the prior art;

[0017] Figure 2 yes Figure 1 A side view schematic diagram of

[0018] Figure 3 It is a schematic diagram of the prior art graded impeller structure;

[0019] Figure 4 is Figure 3 Schematic diagram of the structure with mechanical labyrinth seal installed on the foundation;

[0020] Figure 5 It is a schematic diagram of the structure of the ultrafine pulverizer classification assembly of the utility model;

[0021] Figure 6 This is a schematic structural diagram of the grading impeller of the utility model;

[0022] Figure 7 yes Figure 6 A top view of

[0023] Figure 8 It is a top view of the fixing ring of the present utility model. DETAILED DESCRIPTION

[0024] The utility model is a superfine pulverizer grading impeller structure as follows Figure 6-8 As shown, it also includes an air separation chamber 16, a crushing chamber, a classifying impeller 10 arranged in the crushing chamber, and a mechanical labyrinth seal 17 arranged between the air separation chamber 16 and the crushing chamber, wherein the classifying impeller 10 includes a bottom plate 20 and a circle of main blades 21 fixed on the bottom plate 20. The bottom plate 20 is a device for connecting the classifying impeller 10 to the classifying main shaft 11. The bottoms of the multiple main blades 21 are respectively welded to the outer side of the upper surface of the bottom plate 20 and are arranged circumferentially.

[0025] The difference is that the top of the main blade 21 of the present invention is also provided with a cleaning blade 22 that extends into the groove of the mechanical labyrinth seal 17 to form a concave-convex seal with it and can rotate in the groove with the grading impeller 10. The number of main blades 21 is the same as that of the prior art and can be 24 or other numbers. The number and location of the cleaning blades 22 on the top of the main blade 21 can correspond to the number of grooves in the mechanical labyrinth seal 17. For example Figure 6 As shown, if the number of grooves is one level, then the number of cleaning blades 22 on the top of the main blade 21 is one. By analogy, if the number of grooves is two levels (i.e., there are two grooves), then two cleaning blades 22 are provided on the top of the main blade 21, respectively extending into the two grooves. In addition, each main blade 21 is provided with a cleaning blade 22 on the top. Of course, cleaning blades 22 can also be provided on some of the main blades 21 or at intervals. However, if all main blades 21 are provided with cleaning blades 22, the cleaning effect and the effect of avoiding powder accumulation will definitely be better. The cleaning blade 22 and its main blade 21 can be an integral structure and processed as a whole. The size of the cleaning blade 22 is made according to the size of the groove, slightly smaller than the size of the groove so that it can rotate in the groove.

[0026] like Figure 8As shown, the classifying impeller 10 further includes a fixing ring 23 fixed to the inner edge of a ring of main blades 21. Specifically, the outer edge of the fixing ring 23 may be provided with the same number of slots 24 as the number of main blades 21. The slots 24 engage with the middle and upper sections of the inner edges of the corresponding main blades 21 and are fixed by welding, thereby providing overall reinforcement between the main blades 21.

[0027] During the processing of ultrafine powder, the above-mentioned cleaning blades 22 can rotate at high speed with the grading impeller 10, not only forming a concave-convex seal with the groove of the mechanical labyrinth seal 17, thereby strictly sealing the air separation chamber to prevent unqualified fineness materials from accidentally entering the finished product discharge port, ensuring the fineness quality, but also through the wind force generated by the cleaning blades 22 during the high-speed rotation, the fine powder settled in the gap between the concave-convex labyrinth on the top is swept away, avoiding the jamming phenomenon caused by the accumulation and hardening of fine powder settled on the top during the operation of the grading impeller 10.

[0028] However, those skilled in the art should recognize that the above embodiments are merely intended to illustrate the present invention and are not intended to limit the present invention. Any changes or modifications to the above embodiments shall fall within the scope of the claims of the present invention as long as they are within the spirit of the present invention.

Claims

1. A superfine pulverizer classifying impeller structure, comprising an air separation chamber, a grinding chamber, a classifying impeller disposed within the grinding chamber, and a mechanical labyrinth seal disposed between the air separation chamber and the grinding chamber, wherein the classifying impeller comprises a base plate and a ring of main blades fixed to the base plate, characterized in that: The top of the main blade is also provided with a sweeping blade which extends into the groove of the mechanical labyrinth seal to form a concave-convex seal and can rotate in the groove along with the grading impeller.

2. The ultrafine pulverizer classification impeller structure according to claim 1, characterized in that: The number and arrangement positions of the cleaning blades on the top of the main blade correspond to and match the number of groove stages of the mechanical labyrinth seal.

3. The ultrafine pulverizer classification impeller structure according to claim 1 or 2, characterized in that: Each main blade is provided with a sweeping blade on top.

4. The ultrafine pulverizer classification impeller structure according to claim 3, characterized in that: The cleaning blade and the main blade are an integrated structure.

5. The ultrafine pulverizer classification impeller structure according to claim 1, characterized in that: The grading impeller further comprises a fixing ring fixed on the inner edge of the main blade.

6. The ultrafine pulverizer classification impeller structure according to claim 5, characterized in that: The outer edge of the fixing ring is provided with the same number of slots as the main blades, and the fixing ring is connected with the corresponding main blades through the slots and fixed by welding.

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