CN221347781U - Assembled large gear - Google Patents
Assembled large gear Download PDFInfo
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- CN221347781U CN221347781U CN202323311185.1U CN202323311185U CN221347781U CN 221347781 U CN221347781 U CN 221347781U CN 202323311185 U CN202323311185 U CN 202323311185U CN 221347781 U CN221347781 U CN 221347781U
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- large gear
- assembled
- ball mill
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- 230000005540 biological transmission Effects 0.000 claims abstract description 10
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 abstract description 16
- 229910045601 alloy Inorganic materials 0.000 abstract description 16
- 239000000956 alloy Substances 0.000 abstract description 16
- 239000010959 steel Substances 0.000 abstract description 16
- 229910001208 Crucible steel Inorganic materials 0.000 abstract description 12
- 239000000463 material Substances 0.000 abstract description 10
- 238000010438 heat treatment Methods 0.000 description 21
- 238000005452 bending Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000003754 machining Methods 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005242 forging Methods 0.000 description 2
- 239000012761 high-performance material Substances 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 238000005496 tempering Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001568 sexual effect Effects 0.000 description 1
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Abstract
The utility model relates to the technical field of ball mill transmission, in particular to an assembled large gear, which comprises a ball mill, wherein the outer wall of the ball mill is provided with a large gear for driving a cylinder body of the ball mill to rotate, the large gear is driven by a transmission system, and the large gear comprises: the assembled gear rings are connected in an annular mode to form a large gear, and the number of the assembled gear rings is 14-18. According to the assembled large gear, the working part is separated from other parts, the tooth arc of the working part is made of the low-alloy forged steel, the material of the working part is improved to the low-alloy forged steel from the original low-alloy cast steel, the weight of the large gear is reduced, and therefore the power consumption of the ball mill is reduced.
Description
Technical Field
The utility model relates to the technical field of ball mill transmission, in particular to an assembled large gear.
Background
The ball mill is driven by main bearings at two ends of the cylinder, a large gear is arranged at one end of the cylinder, a small gear is arranged on two small gear bearing seats, a main motor transmits torque to the small gear through a speed reducer and an input shaft, and the small gear is meshed with the large gear to drive the cylinder to rotate.
The large gear is an important component part in the ball mill transmission structure, and is arranged outside the cylinder body, the diameter of the large gear is usually 6-8 meters, and the weight of the large gear is 20-30 tons. The large gear consists of two half gears, and the two half gears are connected into a complete large gear through connecting bolts, as shown in figure 2. Because the structural size of the large gear is too large, the large gear cannot be manufactured by adopting a forging piece, and cast steel with mechanical properties inferior to those of forged steel can only be used as a blank of the large gear. For a soft tooth surface open gear of a ball mill, the main form of gear failure is tooth thickness reduction caused by tooth surface abrasion, and finally tooth breakage is caused. The higher the contact fatigue limit of the test gear, the stronger the abrasion resistance of the tooth surface; the higher the bending fatigue limit of the test gear is, the stronger the fracture resistance of the gear is, so that the contact fatigue limit and the bending fatigue limit of the gear material are improved, and the structural size and the weight of the gear can be obviously reduced on the premise of the same service life. The comparison of contact fatigue limit of the quenched and tempered alloy forged steel and the cast steel test gear is shown in fig. 3, when the heat treatment grade of the material is MQ and the hardness HB=250, the contact fatigue limit sigma Hlim =701 Mpa of the quenched and tempered alloy forged steel test gear and the contact fatigue limit sigma Hlim =617 Mpa of the quenched and tempered alloy cast steel test gear are obtained. The comparison of bending fatigue limit of the test gear of quenched and tempered alloy forged steel and cast steel is shown in fig. 4, when the heat treatment grade of the material is MQ and the hardness is hb=250, the bending fatigue limit sigma flim=293 Mpa of the test gear of quenched and tempered alloy forged steel, and the contact fatigue limit sigma flim=252 Mpa of the test gear of quenched and tempered alloy cast steel. It can be seen that the performance of wrought steel is much higher than cast steel, so that the modulus and the tooth width of the cast large gear are much larger than those of the forged piece when the same load is met, and the weight of the whole cast large gear is also much heavier. The disadvantages thus brought are as follows:
1. High power consumption of ball mill
The large gear is arranged on the cylinder body and rotates along with the cylinder body, and the weight of the large gear increases the rotating load, so that the weight of the large gear can bring about the increase of the current of the ball mill.
2. The heat treatment difficulty is high and the hardness deviation of the tooth surface is high
Because the structural size of the large gear is overlarge, the deformation generated in the heat treatment process is increased, and even heat treatment of each part is difficult, the processing amounts of tooth surfaces at different positions are greatly different in finish machining after heat treatment, and the hardness of the tooth surfaces is uneven.
3. Big difficulty in processing and manufacturing large gear
Because the diameter of the large gear reaches 6-8 meters, a large enough gear machining machine tool is needed, so that the machining and manufacturing difficulty is high, and the manufacturing cost is increased.
4. Big gear has high transportation difficulty and high transportation cost
Even though the large gear is split into two half gears, the transportation width of the half gears is up to more than 3 meters, which exceeds the normal transportation width of the highway.
Disclosure of utility model
The utility model aims to provide an assembled large gear to solve the problems in the prior art.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
the utility model provides an pin-connected panel gear wheel, includes the ball mill, the outer wall of ball mill is provided with the gear wheel that drives its barrel pivoted, and the gear wheel passes through transmission system and drives, the gear wheel includes: the assembled gear rings are connected in an annular mode to form a large gear, and the number of the assembled gear rings is 14-18.
Preferably, each of the fabricated ring gears includes: the gear ring comprises a gear ring body, a tooth arc connecting bolt and a key; the tooth arcs are respectively arranged on two sides of each gear ring body, and are identical to tooth grooves of the gear ring bodies, wherein the gear ring bodies are made of common carbon steel, for example, are formed by welding or casting common Q235A steel plates, and the tooth arcs are made of forged low alloy steel with better performance, for example, 35CrMo.
Preferably, four tooth arc connecting bolt holes are formed in the gear ring body and the two tooth arcs, and the tooth arc connecting bolt is in threaded connection with the inner wall of the tooth arc connecting bolt hole.
Preferably, the key groove is formed in two side faces of the gear ring body and the two tooth arcs, and a key is inserted into the inner wall of the key groove and used for reinforcing connection of the gear ring body and the two tooth arcs.
Preferably, the key is provided with a counter bore, and the key is arranged on the gear ring body through a screw.
Preferably, when the assembled gear rings are spliced in an annular mode, the assembled gear rings are connected through four groups of gear ring connecting bolts in sequence.
Compared with the prior art, the utility model has the beneficial effects that:
According to the assembled large gear, the working part is separated from other parts, the tooth arcs of the working part are made of low alloy forged steel, the material of the working part is improved from original low alloy cast steel to low alloy forged steel, the weight of the large gear is reduced, and therefore the power consumption of the ball mill is reduced;
The assembled large gear has the advantages that the heat treatment cost is greatly reduced, and the assembled large gear is assembled, so that the assembled large gear is convenient to put in a furnace for carrying out the sexual heat treatment, meanwhile, the tooth arc and the gear ring body are separated for carrying out the heat treatment, the tooth arc has high performance requirements, the high standard is adopted for carrying out the heat treatment, the gear ring body has low performance requirements, and the low standard is adopted for carrying out the heat treatment, so that the heat treatment cost is further reduced;
The assembled large gear can be separately processed, so that the size requirement of a processing machine tool is reduced, and the manufacturing cost is reduced; the assembled large gear can be separately packaged and transported, and the transportation difficulty and cost are reduced.
Drawings
FIG. 1 is a schematic diagram of the ball mill drive of the present utility model;
FIG. 2 is a comparison of contact fatigue limits for a forged steel and cast steel test gear of the present utility model.
FIG. 3 is a graph comparing bending fatigue limits of a forged steel and cast steel test gear;
FIG. 4 is a schematic view of a fabricated gearwheel according to the utility model;
FIG. 5 is a schematic view of an assembled ring gear of the present utility model;
FIG. 6 is a schematic view of a ring gear body according to the present utility model;
FIG. 7 is a schematic view of a rack of the present utility model;
FIG. 8 is a schematic diagram of a key of the present utility model.
In the figure: 1. ball mill; 2. a transmission system; 3. a large gear; 31. a fabricated gear ring; 32. tooth arc; 33. a gear ring body; 34. a key; 35. a screw; 36. tooth arc connecting bolts; 37. a key slot; 38. countersink; 39. tooth arc connecting bolt hole.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the prior art, the large gear 3 is a heavy-duty transmission part, and the tooth surfaces and teeth of the gear are working parts, which account for about 50% of the total weight. Compared with other parts, the working part has higher requirements on the performance of materials. The working part of the conventional large gear and other parts are integrated, and only the same material can be selected. And because the structural size of the large gear is very large, the use of high-performance materials is limited, and even if the high-performance materials are used for overcoming the factors of the structural size, the manufacturing cost is greatly increased, so that the conventional large gear generally adopts low-alloy cast steel materials, and the hardness HB=220-260 after quenching and tempering treatment.
The embodiment of the invention is as follows:
As shown in fig. 1 to 8, an assembled large gear comprises a ball mill 1, wherein a large gear 3 for driving a cylinder body of the ball mill 1 to rotate is arranged on the outer wall of the ball mill 1, the large gear 3 is driven by a transmission system 2, and the large gear 3 comprises: the assembled gear rings 31 are connected in an annular mode to form the large gear 3, the number of the assembled gear rings 31 is 14-18, and when the assembled gear rings 31 are spliced in an annular mode, the assembled gear rings are connected through four groups of gear ring connecting bolts 4 in sequence.
Each of the fabricated ring gears 31 includes: a ring gear body 33, a tooth arc connecting bolt 36 and a key 34; the tooth arcs 32 are respectively installed on two sides of each gear ring body 33, and the tooth arcs 32 are the same as tooth grooves of the gear ring bodies 33, wherein the gear ring bodies 33 are made of common carbon steel, for example, are formed by welding or casting common Q235A steel plates, and the tooth arcs 32 are made of forged low alloy steel with better performance, for example, 35CrMo.
Four tooth arc connecting bolt holes 39 are formed in the gear ring body 33 and the two tooth arcs 32, and then the tooth arcs 32 on two sides of the gear ring body 33 are fixed through the tooth arc connecting bolts 36 in a threaded connection mode on the inner wall of each tooth arc connecting bolt hole 39.
Key grooves 37 are formed in both side surfaces of the gear ring body 33 and the two tooth arcs 32, and keys 34 are inserted into the inner wall of each key groove 37 for reinforcing connection of the gear ring body 33 and the two tooth arcs 32. A counterbore 38 is then provided in the key 34 and the key 34 is mounted to the ring gear body 33 using screws 35.
It should be noted that, in this embodiment, the transmission system 3 includes a motor, a speed reducer, an input shaft, a pinion bearing seat, and a main bearing ball mill installed on two sides of the ball mill, which are all prior art, and are not main innovation points, and are not described in detail herein.
According to the assembled large gear, the working part is separated from other parts, the tooth arc of the working part is made of low alloy forged steel, the hardness after quenching and tempering can reach HB not less than 300, and the contact fatigue limit sigma Hlim of the test gear is not less than 767Mpa, and the contact fatigue limit sigma Flim of the test gear is not less than 315Mpa, which is obtained by table lookup 3 and table 4. The material of the working part is improved to low alloy forging steel from original low alloy cast steel, the performance of the material is improved by about 25%, and under the condition of meeting the same use condition and the same gear modulus, the tooth width of the large gear device provided by the invention can be reduced by 20%, and the whole weight of the large gear is reduced by more than 10%;
the assembled large gear greatly reduces the heat treatment cost, and firstly, the original large gear needs to be capable of accommodating a heat treatment furnace with a lower size of 4x8 m workpiece, and only needs to be capable of accommodating a heat treatment furnace with a lower size of 1x 2m workpiece. The larger the workpiece, the greater the heat treatment difficulty and the higher the heat treatment cost. The second reason is that the tooth arc and the gear ring body are separately subjected to heat treatment, the tooth arc has high performance requirements, the high standard is adopted for heat treatment, the gear ring body has low performance requirements, and the low standard is adopted for heat treatment, so that the cost of heat treatment is further reduced.
The working principle of the utility model is as follows:
When the large gear 3 is installed, the tooth arcs 32 are sequentially installed on two sides of the gear ring body 33, four tooth arc connecting bolts 36 sequentially penetrate through the tooth arc connecting bolt holes 39 to be fixed, then two keys 34 are respectively placed in key grooves 37, screws 35 penetrate through counter bores 38 and are connected with the gear ring body 33 in a threaded mode to be fixed, then a plurality of gear ring bodies 33 are annularly combined, and head-to-tail connection is achieved through the gear ring connecting bolts 4.
The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the above-described embodiments, and that the above-described embodiments and descriptions are only preferred embodiments of the present utility model, and are not intended to limit the utility model, and that various changes and modifications may be made therein without departing from the spirit and scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (6)
1. The utility model provides an pin-connected panel gear wheel, includes ball mill (1), the outer wall of ball mill (1) is provided with its barrel pivoted gear wheel (3), and gear wheel (3) are driven through transmission system (2), its characterized in that: the gearwheel (3) comprises: the gear comprises assembled gear rings (31), wherein the assembled gear rings (31) are connected in an annular mode to form a large gear (3), and the number of the assembled gear rings (31) is 14-18.
2. The fabricated large gear according to claim 1, wherein: each of the fabricated ring gears (31) includes: a gear ring body (33), a tooth arc connecting bolt (36) and a key (34);
Tooth arcs (32) are respectively arranged on two sides of each gear ring body (33), and the tooth arcs (32) are identical to tooth grooves of the gear ring bodies (33).
3. The fabricated large gear according to claim 2, wherein: four tooth arc connecting bolt holes (39) are formed in the gear ring body (33) and the two tooth arcs (32), and the tooth arc connecting bolts (36) are in threaded connection with the inner walls of the tooth arc connecting bolt holes (39).
4. A split big gear according to claim 3, wherein: key grooves (37) are formed in the two side faces of the gear ring body (33) and the two tooth arcs (32), and keys (34) are inserted into the inner walls of the key grooves (37) and used for reinforcing connection of the gear ring body (33) and the two tooth arcs (32).
5. The split big gear of claim 4, wherein: the key (34) is provided with a counter bore (38), and the key (34) is arranged on the gear ring body (33) through a screw (35).
6. The fabricated large gear according to claim 1, wherein: when the assembled gear rings (31) are spliced in an annular mode, the assembled gear rings are connected through four groups of gear ring connecting bolts (4) in sequence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323311185.1U CN221347781U (en) | 2023-12-06 | 2023-12-06 | Assembled large gear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323311185.1U CN221347781U (en) | 2023-12-06 | 2023-12-06 | Assembled large gear |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221347781U true CN221347781U (en) | 2024-07-16 |
Family
ID=91834237
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202323311185.1U Active CN221347781U (en) | 2023-12-06 | 2023-12-06 | Assembled large gear |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221347781U (en) |
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2023
- 2023-12-06 CN CN202323311185.1U patent/CN221347781U/en active Active
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