CN110976953B - Narrow space axial pinhole processingequipment - Google Patents
Narrow space axial pinhole processingequipment Download PDFInfo
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- CN110976953B CN110976953B CN201911292615.5A CN201911292615A CN110976953B CN 110976953 B CN110976953 B CN 110976953B CN 201911292615 A CN201911292615 A CN 201911292615A CN 110976953 B CN110976953 B CN 110976953B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B41/00—Boring or drilling machines or devices specially adapted for particular work; Accessories specially adapted therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2215/00—Details of workpieces
- B23B2215/76—Components for turbines
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Abstract
The invention relates to a narrow-space axial pin hole machining device which comprises a supporting structure, a transmission structure, a drill arm and a drill bit, wherein the supporting structure is used for connecting the machining device with a tool rest of a machine tool; the transmission structure transmits torque to the drill bit through three transmission modes, namely belt transmission, main shaft transmission and chain transmission. The drill boom is used for clamping a drill bit, the drill boom is a closed shell with a hollow interior, and a chain transmission assembly and a fixed drill bit are arranged in the shell; the thickness of the shell of the drill boom is 30 mm; the drill boom is capable of rotation and movement. The invention has the beneficial effects that: the axial pinhole processing that can realize the steam turbine rim plate in the narrow space between the rim plate, workable minimum space scope is 40mm, and simple structure is compact, economy practices thrift, uses comparatively in a flexible way, easy and simple to handle, suitability is strong, and the range of processing is wider.
Description
Technical Field
The invention belongs to the technical field of drilling of steam turbines, and particularly relates to a narrow-space axial pin hole machining device.
Background
As an important component of a steam turbine, a steam turbine rotor is mainly composed of a main shaft, blades, a multi-stage disk, and the like. When the steam turbine rotor is installed, the blades need to be installed in the wheel disc grooves, and then the blades and the wheel disc are locked and fixed through the axial positioning pin holes in the wheel disc, so that sliding is prevented, and the working faults of the steam turbine rotor caused by loosening and falling of the blades are prevented. But the wheel discs are usually in multiple stages, the distance between the wheel discs is narrow, and the distance between the wheel discs of each stage is about 70 mm; drilling or reaming is done in such narrow spaces, which cannot be done with conventional drilling equipment.
In the prior art, the axial positioning pin hole processing of the steam turbine rotor disc is required to be realized in a narrow space, a special drilling machine needs to be customized, but most of the special drilling machines in the prior art are in gear transmission, the structure is complex, and the whole equipment is expensive.
Therefore, it is highly desirable to design a device capable of performing axial drilling of a turbine disk in a narrow space.
Disclosure of Invention
Technical problem to be solved
The invention provides a narrow-space axial pin hole machining device, which aims to solve the problems that in the prior art, the distance between turbine rotor impellers is narrow, the axial drilling operation of the impellers is difficult to complete, the structure of a special drilling machine is complex, and equipment is expensive.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
a narrow-space axial pin hole machining device comprises a supporting structure, a transmission structure, a drill arm and a drill bit, wherein the supporting structure is used for connecting the machining device with a machine tool rest, and the machine tool rest controls the machining device to move integrally;
the transmission structure is used for providing power to the drill bit;
the drill boom is used for clamping a drill bit, one end of the drill boom is connected with the supporting structure, and the other end of the drill boom is fixedly connected with the drill bit;
the drill boom is of a closed shell structure with a hollow interior.
The thickness of the shell of the drill boom is 30 mm.
The supporting structure comprises a machine tool connecting plate, a first spindle bracket and a second spindle bracket;
the first spindle support and the second spindle support are connected with the machine tool connecting plate through welding; the machine tool connecting plate is connected with the machine tool rest.
The transmission structure comprises a motor, a belt transmission assembly, a main shaft transmission assembly and a chain transmission assembly;
the output end of the motor is connected with the input end of the belt transmission assembly, the output end of the belt transmission assembly is connected with the input end of the main shaft transmission assembly, and the input end of the main shaft transmission assembly is connected with the input end of the chain transmission assembly; the chain transmission assembly transmits power to the drill bit;
the belt transmission component comprises a motor, a small belt pulley, a large belt pulley and a belt;
the motor is connected with the machine tool connecting plate through a screw; the small belt pulley is connected with the motor;
the big belt pulley and the small belt pulley are connected through the belt.
The main shaft transmission assembly comprises a main shaft and a main shaft bearing; the main shaft bearing is arranged on the main shaft; one end of the main shaft is connected with the large belt pulley, and the other end of the main shaft is connected with the small chain wheel.
The chain transmission assembly comprises a small chain wheel, a chain and a large chain wheel; the small chain wheel is connected with one end of the main shaft; the small chain wheel is connected with the large chain wheel through a chain.
The drill arm is provided with a T-shaped bolt groove, and the T-shaped bolt groove is matched with a T-shaped bolt; one end of the T-shaped bolt is fixed inside the second spindle bracket;
in the pin hole machining process, the drill arm is fastened to the second spindle support through a nut of a T-shaped bolt;
after the nut of the T-shaped bolt is loosened, the drill boom can integrally rotate by taking the main shaft as an axis and can also integrally move along the direction of the main shaft.
The large chain wheel and the chain are sealed in the shell of the drill boom;
the drill bit is fixed in the through hole in the center of the large chain wheel through a taper sleeve, and the taper sleeve is locked by a locking nut.
The drill boom is fixedly provided with a balance block, and an included angle formed by the balance block and the drill boom is larger than 90 degrees.
The processing device also comprises a housing, wherein the housing comprises a large housing and a small housing and is used for safety protection; the big housing is connected with the first main shaft bracket through a screw; the small cover shell is connected with the drill boom through screws.
(III) advantageous effects
The invention has the beneficial effects that: the narrow-space pin hole processing device can realize the axial pin hole processing of the turbine wheel disc in a narrow space, and the minimum processable space range is 40 mm; according to the invention, the drill bit has the most suitable pin hole processing speed through the three groups of transmission assembly structures; the pin hole is more convenient to process by the integral rotatable and movable design of the drill boom; in addition, the narrow-space pin hole machining device is simple and compact in structure, economical, flexible to use, simple and convenient to operate, high in applicability and wide in machining range.
Drawings
FIG. 1 is a top view of the overall structure of a narrow space axial pin hole machining device according to the present invention;
FIG. 2 is a schematic elevation view of a narrow space axial pin hole machining apparatus according to the present invention;
FIG. 3 is a side view of the narrow space axial pin bore forming apparatus of the present invention;
FIG. 4 is an enlarged view of a drill bit of the present invention;
FIG. 5 is a schematic view of a drill bit according to the present invention.
[ description of reference ]
11: connecting a machine tool board; 12: a motor; 13: a compression cover; 14: a small belt pulley; 15: a belt; 16: a large belt pulley; 17: a first spindle support; 18: a main shaft; 19: a second spindle support; 110: a small sprocket; 111: a chain; 21: a specialty attachment screw; 22: a large housing; 23: a main shaft bearing end cover; 24: a main shaft bearing; 25: a small housing; 26: a T-bolt; 31: drilling a plate end cover; 32: drilling a plate; 33: a counterbalance; 41: a large sprocket; 42: a large sprocket bearing end cover; 43: a large sprocket bearing; 44: locking a nut; 45: a taper sleeve; 46: a drill bit.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.
The embodiment provides a narrow-space axial pin hole machining device which can complete the machining of an axial pin hole in the space of each stage of wheel disc of about 70 mm. The narrow-space axial pin hole machining device comprises a supporting structure, a transmission structure, a drill boom, a drill bit and a housing, and is integrally connected with a horizontal lathe tool rest.
The supporting structure comprises a machine tool connecting plate 11, a first spindle bracket 17 and a second spindle bracket 19; the first spindle support 17 and the second spindle support 19 are connected with the machine tool connecting plate in a welding mode; the machine tool connecting plate 11 is connected with the machine tool rest through a special connecting screw.
The support structure enables the machining device to be integrally connected to the machine tool rest, and the machining device can be integrally moved by operating the machine tool rest.
The transmission structure comprises a motor 12, a belt transmission assembly, a main shaft transmission assembly and a chain transmission assembly;
the output end of the motor 12 is connected with the input end of a belt transmission assembly, the output end of the belt transmission assembly is connected with the input end of the main shaft transmission assembly, and the input end of the main shaft transmission assembly is connected with the input end of the chain transmission assembly; the chain drive assembly transmits power to the drill bit.
The belt transmission component comprises a motor 12, a small belt pulley 14, a large belt pulley 16 and a belt 15;
the motor 12 is connected with the machine tool connecting plate 11 through a screw; the pressing cover 13 connects the small belt pulley 14 with the motor 12 through a motor positioning key and a screw; the large pulley 16 and the small pulley 14 are connected by the belt 15.
The motor 12, after starting, has a fixed rotational speed, i.e. torque; the small pulley 14 and the large pulley 16 can receive the torque transmitted by the motor 12 under the connection of the belt 15 and the pressing cover 13 and the screw.
The spindle drive assembly includes a spindle 18 and a spindle bearing 24; further, as shown in fig. 1, in the present embodiment, the two main shaft bearings 24 are distributed on the left and right of the main shaft 18. The main shaft bearing end cover 23 is installed outside the main shaft bearing 24 and fixed to the first main shaft bracket 17 and the second main shaft bracket 19 by screws respectively, so as to prevent grease on the surface of the main shaft bearing 24 from running off and prevent dust and impurities from entering the main shaft bearing to cause damage.
One end of the main shaft 18 is connected with the large belt pulley 16 through a double lock nut, and the other end is connected with the small chain wheel 110 through a double lock nut. Torque is further transmitted to the main shaft by the connection of the main shaft 18 with the large pulley 16.
The chain transmission assembly comprises a small chain wheel 110, a chain 111 and a large chain wheel 41;
the small chain wheel 110 is connected with one end of the main shaft 18; the small sprocket 110 is connected to the large sprocket 41 by a chain 111. By the mutual cooperation of the chain drive components, the torque is transmitted from the main shaft 18 to the small sprocket 110 and then further to the large sprocket 41 via the chain.
The drill boom comprises a drill plate end cover 31 and a drill plate 32, the drill plate 32 is a long-strip-shaped half shell, the drill plate end cover 31 and the drill plate 32 are matched with screws through positioning pin holes in the drill plate 32 to realize fixed connection, and a closed and hollow shell is formed. The thickness of the shell formed by the drill plate end cover 31 and the drill plate 32 is 30 mm. Will the thickness control of casing is at 30mm, can realize accomplishing the processing of axial pinhole in 70 mm's narrow space, and casing thickness is far less than the average distance between the rim plate at each level of steam turbine simultaneously, and through the experiment, the processingequipment of this embodiment can realize that the minimum 40mm narrow space in pinhole processing.
The large chain wheel 41 and the chain 111 are integrally enclosed in a shell formed by the drill plate end cover 31 and the drill plate 32; the large sprocket 41 and the drill 46 are fixed together, so that the moment of the large sprocket 41 can be obtained, and the pin hole can be machined in a rotating manner.
A large sprocket bearing 43 is mounted on the large sprocket 41, and as shown in fig. 4, a large sprocket bearing end cover 42 is fixed on the drill plate 32 and the drill plate end cover 31 by screws to prevent grease on the bearing surface from running off and prevent dust and impurities from entering the bearing and causing damage.
The middle of the large chain wheel 41 is provided with a circular through hole, and the taper sleeve 45 fixes the drill 46 and the large chain wheel 41, which is embodied as follows: the taper sleeve 45 is sleeved in the large chain wheel 41; the tail shank of the drill bit 46 is sleeved with the taper sleeve 45.
The drill bit 46 is fixed with the large chain wheel 41 into a whole through the taper sleeve 45, and the taper sleeve 45 is locked by the locking nut 44 to prevent loosening; the end of the drill 46 is designed to be flat to prevent the drill 46 from rotating relative to the large sprocket 41. The torque received by the chain drive assembly can be brought to the drill bit 46 to effect the machining of the axial pin hole in the turbine disk.
For the positioning pin hole on the turbine wheel disc, the diameter is not large under general conditions, so that the drill bit of the embodiment can meet the requirement for processing the pin hole by selecting a short Morse 1-degree taper shank drill; of course, if a machining pin hole with a larger diameter appears in actual conditions, the drill bit can be replaced by a plurality of sizes and lengths to meet machining requirements, and therefore operation in a narrow space is achieved.
The drill boom is rotated and moved by a T-bolt 26, specifically:
t-shaped bolt grooves 26 are formed in the drill plate 32 and the drill plate end cover 31; one end of the T-bolt 26 is fixed inside the second spindle bracket 19;
the drill boom is fastened to the second spindle bracket 19 through a nut of a T-shaped bolt in a pin hole machining process; after the nut of the T-bolt is loosened, the drill boom may be integrally rotated around the spindle 18 or integrally moved in the direction of the spindle.
After a pin hole is machined, the next wheel disc is required to be machined, and the drill arm can be moved out of a machining groove formed between two adjacent wheel discs in the previous two stages. In addition, in the actual pin hole processing, the processing device is used for limiting the travel of the horizontal lathe, and although the whole processing device can be moved by operating the tool rest of the machine tool, the processing device cannot be directly moved out of the processing groove formed between two adjacent wheel discs.
Based on the above situation, this embodiment designs into rotatable structure with the drilling plate 32, and the drill boom is whole also can rotate, can dodge the space, moves out the drill boom whole outside the processing trench that forms between the adjacent rim plate of two-stage.
The specific operation steps are as follows: loosening the T-shaped bolt 26, manually moving the drill plate 32, and rotating by taking the main shaft as an axis to avoid a space; when necessary, the tool rest of the machine tool can be manually controlled to enable the whole machining device to move for a certain distance until the next machining groove formed between the two adjacent stages of wheel discs is moved. After the movement is finished, the T-shaped bolt is screwed down, and then new pin hole machining can be carried out.
In the process of space avoidance, when the drill boom is rotated or moved manually, the drill boom needs to rotate by a certain angle or move by a certain distance; and because the drill boom has a large mass, the operator is forced to rotate or move, and in order to make the operation of the operator more convenient and labor-saving, a balance weight 33 is fixedly arranged on the drill plate 32 through a screw in the embodiment. The included angle formed by the balance weight 33 and the drill boom is larger than 90 degrees, and the balance weight and the drill boom move and rotate synchronously. When the drill boom is rotated or moved, the balance weight 33 has a certain weight, so that a part of the weight can be offset with the gravity of the drill boom, and the working progress and the processing efficiency of an operator are facilitated.
In the embodiment, a certain reduction ratio is designed between the large belt pulley 16 and the small belt pulley 14, specifically, the large belt pulley 16 and the small belt pulley 14 have a certain diameter ratio; a certain reduction ratio is designed between the large belt pulley 16 and the small chain wheel 110; a certain reduction ratio is designed between the small chain wheel and the large chain wheel, and the specific expression is that the large chain wheel 41 and the small chain wheel 110 have a certain diameter ratio.
Because the rotating speed of the power source motor is higher, a certain reduction ratio is arranged in the belt transmission assembly, the spindle transmission assembly and the chain transmission assembly, so that the drill bit finally obtains the rotating speed which is most suitable for machining.
For the drill bit in the machining process, the linear velocity V of the edge of the drill bit when the drill bit rotates is limited to 12-18m/min according to the formula S ═ V × 1000/pi d, where V is the linear velocity of the drill bit, d is the diameter of the drill bit, and the diameter of the drill bit can also be selected according to actual requirements; the range of the rotation speed S of the drill bit can be calculated through a formula; therefore, the speed reduction ratio of the belt transmission assembly, the main shaft transmission assembly and the chain transmission assembly is set in the embodiment, and the reduction ratio is specifically represented by the diameter proportion of the chain wheel, the belt wheel and the like, so that the processing speed of the drill bit is kept in the most appropriate range, the cutting process is stable, and the processing quality is ensured.
The casing comprises a large casing 22 and a small casing 25; the big housing 22 is connected with the first main shaft bracket 17 through screws; the small housing 25 is connected to the drill plate end cap 31 by screws. The enclosure is used to safeguard an operator.
The operation and use method of the narrow-space axial pin hole processing device of the steam turbine comprises the following steps:
the whole machining device is fixed on a tool rest of the machine tool, the machining device is moved to a pin hole machining position, and an operator shakes the tool rest through a hand wheel to perform alignment so that a drill bit is concentric with the center of a pin hole;
after the position is found accurately, the power supply is started, the motor rotates, the tool rest of the machine tool is shaken to process a feeding pin hole, and after drilling is completed, the power supply is turned off to withdraw the drill bit. If the machine tool is limited in space movement, the nut of the T-shaped bolt of the drill plate can be loosened, and the whole drill arm is moved to rotate for a certain angle by taking the main shaft as an axis or move for a certain distance along the direction of the main shaft to perform space avoidance.
When the next pin hole is machined, the machining device is integrally connected with the horizontal lathe tool rest, so that the machining device can be integrally moved by only operating the lathe tool rest, and then the operations of position alignment, drilling, drill withdrawal, space avoidance and the like are repeated.
The drill bit can be designed into various sizes and lengths to meet the processing requirements, so that the operation in a narrow space is realized.
The above embodiments are merely illustrative, and not restrictive, of the scope of the invention, and those skilled in the art will be able to make various changes and modifications within the scope of the appended claims without departing from the spirit of the invention.
Claims (8)
1. A narrow-space axial pin hole processing device comprises a supporting structure, a transmission structure, a drill arm and a drill bit, and is characterized in that,
the supporting structure is used for connecting the machining device with a machine tool rest, and the machine tool rest controls the machining device to move integrally;
the transmission structure is used for providing power to the drill bit;
the drill boom is used for clamping a drill bit, one end of the drill boom is connected with the supporting structure, and the other end of the drill boom is fixedly connected with the drill bit;
the drill boom is of a closed shell structure with a hollow interior;
the supporting structure comprises a machine tool connecting plate, a first spindle bracket and a second spindle bracket;
the drill arm is provided with a T-shaped bolt groove, and the T-shaped bolt groove is matched with a T-shaped bolt; one end of the T-shaped bolt is fixed inside the second spindle bracket;
in the pin hole machining process, the drill arm is fastened to the second spindle support through a nut of a T-shaped bolt;
after the nut of the T-shaped bolt is loosened, the drill boom can integrally rotate by taking the main shaft as an axis and can also integrally move along the direction of the main shaft;
the drill boom is fixedly provided with a balance block, and an included angle formed by the balance block and the drill boom is larger than 90 degrees.
2. The narrow space axial pin hole machining apparatus of claim 1 wherein the casing thickness of the drill boom is 30 mm.
3. The narrow space axial pin bore machining apparatus of claim 1,
the first spindle support and the second spindle support are connected with the machine tool connecting plate through welding; the machine tool connecting plate is connected with the machine tool rest.
4. The narrow space axial pin hole machining apparatus of claim 1 wherein said drive structure includes a motor, a belt drive assembly, a spindle drive assembly and a chain drive assembly;
the output end of the motor is connected with the input end of the belt transmission assembly, the output end of the belt transmission assembly is connected with the input end of the main shaft transmission assembly, and the input end of the main shaft transmission assembly is connected with the input end of the chain transmission assembly; the chain transmission assembly transmits power to the drill bit;
the belt transmission component comprises a motor, a small belt pulley, a large belt pulley and a belt;
the motor is connected with the machine tool connecting plate through a screw; the small belt pulley is connected with the motor;
the big belt pulley and the small belt pulley are connected through the belt.
5. The narrow space axial pin bore machining apparatus of claim 1 wherein said spindle drive assembly includes a spindle and a spindle bearing; the main shaft bearing is arranged on the main shaft; one end of the main shaft is connected with the large belt pulley, and the other end of the main shaft is connected with the small chain wheel.
6. The narrow space axial pin hole machining apparatus of claim 1 wherein said chain drive assembly comprises a small sprocket, a chain, a large sprocket; the small chain wheel is connected with one end of the main shaft; the small chain wheel is connected with the large chain wheel through a chain.
7. The narrow space axial pin bore machining apparatus of claim 1,
the large chain wheel and the chain are sealed in the shell of the drill boom;
the drill bit is fixed in the through hole in the center of the large chain wheel through a taper sleeve, and the taper sleeve is locked by a locking nut; the taper shank of the drill bit is a short Morse 1-degree taper shank; the tail end of the drill bit is flat.
8. The narrow space axial pin bore machining apparatus of claim 1 further including a housing comprising a large housing and a small housing for safety; the big housing is connected with the first main shaft bracket through a screw; the small cover shell is connected with the drill boom through screws.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911292615.5A CN110976953B (en) | 2019-12-16 | 2019-12-16 | Narrow space axial pinhole processingequipment |
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| CN201911292615.5A CN110976953B (en) | 2019-12-16 | 2019-12-16 | Narrow space axial pinhole processingequipment |
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| CN110976953A CN110976953A (en) | 2020-04-10 |
| CN110976953B true CN110976953B (en) | 2021-10-19 |
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| CN113182548B (en) * | 2021-03-31 | 2022-08-12 | 成都飞机工业（集团）有限责任公司 | Method for drilling hole by point-to-point cutting at preset angle |
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| CN108971552A (en) * | 2018-07-29 | 2018-12-11 | 任大龙 | A kind of component of machine drilling equipment |
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| US6732627B2 (en) * | 2002-08-22 | 2004-05-11 | Black & Decker Inc. | Carrying mechanism for power tools |
| CN203292493U (en) * | 2013-05-23 | 2013-11-20 | 山东豪迈机械制造有限公司 | Portable in-tank flange end face processing machine |
| CN103752898B (en) * | 2014-01-27 | 2016-06-08 | 上海应用技术学院 | Embedded bearing inwall blind hole lathe drilling processing dynamics device |
| CN205128990U (en) * | 2015-12-04 | 2016-04-06 | 哈尔滨汽轮机厂有限责任公司 | A horizontal lathe is rolled over to brill for processing rotor hole in last years of a century |
| CN205571413U (en) * | 2016-02-18 | 2016-09-14 | 诸城市圣阳机械有限公司 | Portable numerical control method is processingequipment even |
| CN206356601U (en) * | 2016-12-22 | 2017-07-28 | 东方电气集团东方汽轮机有限公司 | Lateral drilling machine is used in the pin-and-hole processing of narrow gap space |
| CN107344249B (en) * | 2017-08-13 | 2019-04-12 | 浙江峰邦机械科技有限公司 | A kind of full automatic feeding drilling machine of pipe fitting |
| CN208743712U (en) * | 2018-09-10 | 2019-04-16 | 南京英田光学工程股份有限公司 | Two-axle interlocking lathe |
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| CN203778801U (en) * | 2014-01-14 | 2014-08-20 | 诸暨市启德机械有限公司 | 90-degree turning corner hole drilling device |
| CN108971552A (en) * | 2018-07-29 | 2018-12-11 | 任大龙 | A kind of component of machine drilling equipment |
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