Discharging impeller structure of flour mill

Abstract

The utility model provides a discharging impeller structure of a flour mill, which comprises a mounting seat, a discharging channel arranged above the mounting seat and an impeller arranged below the mounting seat, and the impeller comprises an impeller body, a first sealing element and a second sealing element which are sequentially arranged from bottom to top, a first auxiliary sealing piece and a second auxiliary sealing piece are arranged at the positions, corresponding to the first sealing piece and the second sealing piece, of the mounting base correspondingly, and the first sealing piece and the first auxiliary sealing piece as well as the second sealing piece and the second auxiliary sealing piece form rotary sealing structures parallel to the rotating direction of the impeller correspondingly. According to the utility model, the inner and outer layers of independent sealing structures are arranged, so that a better sealing effect is obtained, and the problem that large-particle powder passes through to influence the product quality is avoided; the two groups of sealing structures respectively form a rotary sealing structure parallel to the rotating direction of the impeller, and the rotating shaft is not easy to cause friction and blockage at the sealing part during rotation, so that the equipment runs more smoothly, and the maintenance and repair cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a grinding machine technical field especially relates to a flour mill discharge impeller structure. BACKGROUND

[0002] Powder manufacturing is a very important part in modern industry, such as calcium carbonate, barium sulfate and a variety of ores in the fine processing, all need to be made into powder by pre-processing, and then subsequent processing. At the same time, the fine development of modern industry, also to the requirement of powder products is constantly improved. The existing powder production line by using ball mill, Raymond mill and other grinding host, with conveyor belt to transport powder products and into the storage room to save.

[0003] Among them, Raymond mill is the most common one kind of fine powder large scale grinding equipment, widely used in barite, calcite, potassium feldspar, talc, marble, limestone, dolomite, fluorite, lime, activated white clay, activated carbon, bentonite, kaolin, cement, phosphate rock, gypsum, glass, thermal insulation materials and other mohs hardness is not more than 9.3 level, humidity in 6% below, non flammable and explosive mineral, chemical, building industry 280 kinds of materials of high fine grinding processing, Raymond mill finished particle size 80-325 mesh range of arbitrary adjustment, some materials can be up to 600 mesh.

[0004] Raymond mill mainly by the shell, host, analyzer, fan, discharge pipe, wherein the discharge pipe is located at the top, because the fan continuously into the air, so that the shell internal pressure is larger, so that the light powder flow upward with air, through the discharge pipe to the storage warehouse. And the inlet of the discharge pipe is provided with a grading impeller, so as to screen the powder, only let the particle size of the powder product through.

[0005] As shown in Figure 1 The current impeller is directly rotating installed at the top of the shell, the front end corresponds to the lower grinding chamber, and the rear end corresponds to the discharge pipe. However, because the impeller is a rotating structure, there is inevitably a certain gap between the edge of the impeller and the mounting seat. If the gap is set too large, it will cause the unqualified materials with large particles to pass through, affecting the quality of the discharged powder. If the gap is set too small, the friction and collision between the impeller and the mounting seat will occur, causing damage to the impeller, and even causing the impeller to be stuck, affecting the normal production. Therefore, a more reasonable sealing structure of the edge of the impeller is needed. UTILITY MODEL CONTENTS

[0006] In view of the deficiencies in the prior art, the utility model provides a flour mill discharge impeller structure, which solves the problem of the gap between the edge of the impeller and the fixing seat in the prior art, and the sealing structure effect is not good.

[0007] According to an embodiment of this utility model, a grinding mill discharge impeller structure includes a mounting base, a discharge channel disposed above the mounting base, and an impeller disposed below the mounting base. A rotating shaft is fixedly disposed in the middle of the impeller. An opening is provided on the mounting base. The discharge channel and the corresponding opening of the impeller are configured to form a discharge path that is connected vertically. The impeller includes an impeller body, a first seal, and a second seal arranged sequentially from bottom to top. The impeller body, the first seal, and the second seal form an integral structure fixed along the rotation direction of the impeller. A first auxiliary seal and a second auxiliary seal are respectively disposed on the mounting base at positions corresponding to the first and second seals. The first seal, the first auxiliary seal, the second seal, and the second auxiliary seal respectively form a rotational sealing structure parallel to the rotation direction of the impeller.

[0008] Furthermore, the inner diameter of the top end face of the impeller body is not less than the diameter of the opening, and both the first and second seals are annular structures with inner diameters not less than the diameter of the opening.

[0009] Furthermore, the mounting base is provided with an annular connecting frame protruding towards the impeller side. The first secondary seal is disposed on the connecting frame and extends towards the center of the mounting base, thereby connecting with the first seal. The second secondary seal is disposed on the surface of the mounting base between the connecting frame and the opening, and faces the impeller direction.

[0010] Furthermore, the second seal is connected to the inner edge of the surface of the first seal near the center, so that the first seal is connected to the first auxiliary seal through its outer edge, while the end of the second seal near the discharge channel is connected to the second auxiliary seal.

[0011] Furthermore, the connecting frame has protruding blocks symmetrically arranged on the inner side of the impeller shaft and the second seal has protruding blocks symmetrically arranged on the outer side of the impeller shaft. A rotating bearing is provided on the side of the block near the impeller. The first seal and the first auxiliary seal have corresponding protrusions on the side surfaces near the discharge channel, thereby limiting and fixing the rotating part and the fixed part of the rotating bearing respectively.

[0012] Furthermore, the first seal and the first auxiliary seal, as well as the second seal and the second auxiliary seal, are connected by labyrinth sealing rings.

[0013] Furthermore, the first sealing element has several protruding locking heads on its surface near the impeller body, and the impeller has corresponding locking slots, so that the locking heads and the locking slots are engaged in a direction parallel to the impeller shaft, thus fixing them relative to the impeller rotation direction.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. This utility model has two independent sealing structures, inner and outer, which provides better sealing effect and avoids the problem of large powder particles passing through and affecting product quality. Furthermore, the first sealing element and the first secondary sealing element, the second sealing element and the second secondary sealing element respectively form a rotating sealing structure parallel to the impeller rotation direction. Therefore, the rotating shaft is less likely to cause friction or jamming at the sealing point when rotating, making the equipment run more smoothly and reducing maintenance and repair costs.

[0016] 2. In this utility model, the impeller and the mounting base have two sets of sealing connection structures, one upper and one lower, and one lower and one upper sealing elements, and a rotating bearing located between them. This seals and limits the connection between the impeller and the mounting base in three directions, making it less prone to vibration and skew when the impeller is affected by the vibration generated by the grinding equipment below during operation. This makes the impeller rotate more smoothly and further reduces the friction with the mounting base.

[0017] 3. In this utility model, a detachable, fully enclosed structure is formed by the connecting frame, the first seal, and the second seal to fix the rotating bearing. This achieves the installation of the rotating bearing in a non-fixed connection manner, making it easier to replace the easily worn rotating bearing. Furthermore, all components are connected in a detachable manner, thereby accelerating the efficiency of parts replacement and maintenance. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the impeller mounting structure in the prior art.

[0019] Figure 2 This is a schematic diagram of the axial cross-section of an embodiment of the present invention.

[0020] Figure 3 for Figure 2 An enlarged schematic diagram of part A in the middle.

[0021] In the above figures: 1. Mounting base; 2. Discharge channel; 3. Impeller; 4. Shaft; 5. Stop; 6. Protrusion; 7. Shaft; 8. Clamp; 11. Connecting frame; 12. First sealing element; 13. Second sealing element; 31. Impeller body; 32. First sealing element; 33. Second sealing element. Detailed Implementation

[0022] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0023] like Figure 1As shown in the figure, this utility model embodiment proposes a mill discharge impeller 3 structure, including a mounting base 1, a discharge channel 2 disposed above the mounting base 1, and an impeller 3 disposed below the mounting base 1. The mounting base 1 is fixed to the top of the mill, the impeller 3 is the only outlet at the top of the mill, and the discharge channel 2 is connected to a storage bin via a pipe.

[0024] In this embodiment, a rotating shaft 74 is fixedly mounted in the middle of the impeller 3. The rotating shaft 74 extends through the discharge channel 2 and is connected to a motor, thereby driving the impeller 3 to rotate. The bottom end of the rotating shaft 74 is detachably connected to the impeller 3. In this embodiment, a screw is preferably used to fix the impeller 3 to the rotating shaft 74 through the mounting hole in the center of the impeller 3. The mounting base 1 is provided with an opening, and the discharge channel 2 and the impeller 3 are arranged with corresponding openings to form a vertically connected discharge path. It should be noted that the inner diameter of the top end face of the impeller body 31 is not less than the diameter of the opening to maintain a sufficient feeding area.

[0025] The impeller 3 includes an impeller body 31, a first seal 32, and a second seal 33 arranged sequentially from bottom to top. The impeller body 31, the first seal 32, and the second seal 33 form an integral structure fixed along the rotation direction of the impeller 3. It should be noted that these three components are detachable along the rotation axis 74, remaining fixed only in the rotation direction perpendicular to the rotation axis 74. A first auxiliary seal 12 and a second auxiliary seal 13 are respectively provided on the mounting base 1 at positions corresponding to the first seal 32 and the second seal 33. The first seal 32 and the first auxiliary seal 12, the second seal 33, and the second auxiliary seal 13 respectively form a rotational sealing structure parallel to the rotation direction of the impeller 3. Preferably, the first seal 32 and the first auxiliary seal 12, the second seal 33, and the second auxiliary seal 13 are connected by labyrinth sealing rings, thereby maintaining a rotational connection while providing excellent sealing performance and preventing dust passage.

[0026] like Figure 2As shown, in a further embodiment, both the first seal 32 and the second seal 33 are annular structures, and their inner diameters are not less than the diameter of the opening. The mounting base 1 is provided with an annular connecting frame 11 protruding towards the impeller 3. The first auxiliary seal 12 is disposed on the connecting frame 11 and extends towards the center of the mounting base 1, thereby connecting with the first seal 32. In this embodiment, the first auxiliary seal 12 is detachably connected to the bottom end of the connecting frame 11 via a screw. The second auxiliary seal 13 is disposed on the surface of the mounting base 1 between the connecting frame 11 and the opening, facing the impeller 3. The second seal 33 is connected to the inner edge of the surface of the first seal 32 near the center, allowing the first seal 32 to be detachably connected to the first auxiliary seal 12 via a screw through its outer edge, while the end of the second seal 33 near the discharge channel 2 is connected to the second auxiliary seal 13. In this embodiment, the first sealing element 32 is a horizontal annular structure, the second sealing element 33 is a vertical annular structure, and the first auxiliary sealing element 12 is a horizontal annular structure disposed inside the connecting frame 11, thereby being vertically connected to the first sealing element 32. The top end of the second sealing element 33 is connected to the second auxiliary sealing element 13 disposed inside the mounting base 1 along the bottom surface.

[0027] In this preferred embodiment, the connecting frame 11 has protruding blocks 5 symmetrically arranged on the inner side of the impeller 3 shaft 74 parallel to the connecting frame 11 and the outer side of the second seal 33 parallel to the impeller 3 shaft 74. A rotary bearing is provided on the side of the block 5 near the impeller 3. The first seal 32 and the first auxiliary seal 12 have protrusions 6 corresponding to the blocks 5 on their surfaces near the discharge channel 2, thereby limiting and fixing the rotating part and the fixed part of the rotary bearing respectively. The rotary bearing can provide horizontal support for the impeller 3, and at the same time lubricate the rotational contact between the first seal 32 and the first auxiliary seal 12, the second seal 33 and the second auxiliary seal 13, so as to avoid contact friction of the toothed structure of the sealing ring when the impeller 3 vibrates radially.

[0028] Furthermore, the first sealing element 32 has several protruding locking heads 8 on its surface near the impeller body 31, and the impeller 3 has corresponding locking heads 8 with locking grooves, so that the locking heads 8 and the locking grooves are engaged in a direction parallel to the impeller 3's rotation axis 74, forming a fixation relative to the impeller 3's rotation direction. In this way, the first sealing element 32 is pressed and fixed by the impeller body 31 upwards to the bottom of the first secondary sealing element 12 and the second sealing element 33, realizing a detachable connection, which facilitates subsequent disassembly and assembly, and allows for faster replacement of parts.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A discharge impeller structure for a grinding mill, characterized in that: The device includes a mounting base, a discharge channel above the mounting base, and an impeller below the mounting base. A rotating shaft is fixedly mounted in the middle of the impeller. The mounting base has an opening. The discharge channel and the corresponding opening of the impeller form a vertically connected discharge path. The impeller includes an impeller body, a first seal, and a second seal arranged sequentially from bottom to top. The impeller body, the first seal, and the second seal form an integral structure fixed along the impeller rotation direction. The mounting base has a first auxiliary seal and a second auxiliary seal respectively positioned corresponding to the first and second seals. The first seal, the first auxiliary seal, the second seal, and the second auxiliary seal each form a rotational sealing structure parallel to the impeller rotation direction.

2. The mill discharge impeller structure as described in claim 1, characterized in that: The inner diameter of the top end face of the impeller body is not less than the diameter of the opening, and both the first seal and the second seal are annular structures, and their inner diameters are not less than the diameter of the opening.

3. The discharge impeller structure of a grinding mill as described in claim 1, characterized in that: The mounting base is provided with an annular connecting frame protruding towards the impeller side. The first secondary seal is disposed on the connecting frame and extends towards the center of the mounting base, thereby connecting with the first seal. The second secondary seal is disposed on the surface of the mounting base between the connecting frame and the opening, and faces the impeller direction.

4. The discharge impeller structure of a grinding mill as described in claim 3, characterized in that: The second seal is connected to the inner edge of the surface of the first seal near the center, so that the first seal is connected to the first auxiliary seal through the outer edge, while the end of the second seal near the discharge channel is connected to the second auxiliary seal.

5. The discharge impeller structure of a grinding mill as described in claim 1, characterized in that: The connecting frame is parallel to the inner side of the impeller shaft and the second seal is parallel to the outer side of the impeller shaft. A rotating bearing is provided on the side of the block near the impeller. The first seal and the first auxiliary seal are respectively provided with protrusions corresponding to the blocks on the side surface near the discharge channel, thereby limiting and fixing the rotating part and the fixed part of the rotating bearing respectively.

6. The discharge impeller structure of a grinding mill as described in claim 1, characterized in that: The first seal and the first auxiliary seal, as well as the second seal and the second auxiliary seal, are connected by labyrinth sealing rings.

7. The discharge impeller structure of a grinding mill as described in claim 2, characterized in that: The first sealing element has several protruding locking heads on its surface near the impeller body. The impeller has corresponding locking slots, so that the locking heads and the locking slots are engaged in a direction parallel to the impeller shaft, thus fixing them relative to the impeller rotation direction.

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