Drilling tool for narrow space of steam turbine cylinder

Abstract

The utility model discloses a drilling tool for a narrow space of a steam turbine cylinder, which relates to the technical field of machining, solves the problem that the narrow space of the steam turbine cylinder is difficult to drill, and comprises a main shaft connecting mechanism and a lengthened transmission base, and the main shaft connecting mechanism is arranged on the lengthened transmission base and is used for being connected with a main shaft sleeve and a drilling machine main shaft; according to the drilling machine spindle, the shaft sleeve of the drilling machine spindle does not rotate, the drilling machine spindle rotates to drive the connecting rod to rotate, the connecting rod drives the adapter shaft, the adapter shaft drives the driving gear, the driving gear drives the transmission gear, the transmission gear drives the drill bit in the shaft sleeve to rotate, and the drilling machine spindle conducts axial feeding, so that the drilling tool can be used for drilling holes in places where the drilling machine spindle cannot reach.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of machining, especially to a steam turbine cylinder narrow space drilling tool. BACKGROUND

[0002] The steam turbine cylinder is an important part of the steam turbine, which plays a positioning role to ensure the correct installation of the internal components of the steam turbine. Some screw hole machining spaces are narrow during installation, and the main shaft of the drilling machine interferes with the inner wall of the cylinder during drilling, which cannot be directly machined and requires a special drilling tool. UTILITY MODEL CONTENTS

[0003] In view of the above-mentioned problem of steam turbine cylinder narrow space drilling difficulty, the utility model aims to provide a steam turbine cylinder narrow space drilling tool. The steam turbine cylinder is an important part of the steam turbine, which plays a positioning role to ensure the correct installation of the internal components of the steam turbine. Some screw hole machining spaces are narrow during installation, and the main shaft of the drilling machine interferes with the inner wall of the cylinder during drilling, which cannot be directly machined. The use of the patent can solve the problem of steam turbine cylinder narrow space drilling difficulty.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the technical scheme that:

[0005] A steam turbine cylinder narrow space drilling tool, comprising: a main shaft connecting mechanism and an extended transmission base, the main shaft connecting mechanism is installed on the extended transmission base and is used for connecting with the main shaft sleeve and the main shaft of the drilling machine;

[0006] The main shaft connecting mechanism comprises: a shell, a connecting rod 3 and a tapered roller bearing 5, the connecting rod 3 is installed in the shell through the tapered roller bearing 5; the main shaft of the drilling machine and the upper end of the connecting rod 3 are connected and drive the connecting rod 3 to rotate around the axis thereof;

[0007] The extended transmission base comprises: an adapter shaft 6, an extended body 7, a transmission mechanism assembly and a sleeve 14, the lower end of the shell is connected with the extended body 7, the lower end of the connecting rod 3 is connected with the upper end of the adapter shaft 6, the sleeve 14 is rotatably installed on the extended body 7, and an assembly groove for assembling the drilling tool is formed in the lower end of the sleeve 14; the transmission mechanism assembly is installed in the extended body 7, the adapter shaft 6 and the sleeve 14 are drivingly connected through the transmission mechanism assembly; the connecting rod 3 drives the adapter shaft 6 to rotate and in turn drives the sleeve 14 to rotate around the axis thereof.

[0008] The steam turbine cylinder narrow space drilling tool, wherein the transmission mechanism assembly comprises: a driving gear 8 and a key 10, a key groove is formed in the adapter shaft 6, and the adapter shaft 6 and the driving gear 8 are connected through the key 10.

[0009] The turbine cylinder narrow space drilling tool, wherein the transmission mechanism assembly further comprises a transmission gear 11, a transmission shaft 12 and a copper sleeve 13, a plurality of transmission shafts 12 are installed in the extension body 7 and arranged in parallel with each other, a copper sleeve 13 is sleeved on each transmission shaft 12, and a transmission gear 11 is installed on each copper sleeve 13.

[0010] The turbine cylinder narrow space drilling tool, wherein the outer periphery of the shaft sleeve 14 is provided with external teeth, the external teeth of the shaft sleeve 14 are in meshing transmission connection with the transmission gear 11 at one end, and the transmission gear 11 at the other end is in meshing transmission connection with the driving gear 8.

[0011] The turbine cylinder narrow space drilling tool, wherein the extension transmission base further comprises a hexagonal bolt 15, the extension body 7 comprises an extension body main body and an extension body gland, the extension body main body and the extension body gland are connected through a plurality of hexagonal bolts 15, and the driving gear 8 and the plurality of transmission gears 11 are arranged between the extension body main body and the extension body gland.

[0012] The turbine cylinder narrow space drilling tool, wherein the extension transmission base further comprises a ball bearing 9, the adapter shaft 6 is installed in the extension body 7 through two ball bearings 9, and the two ball bearings 9 are arranged on the upper side and the lower side of the driving gear 8 respectively.

[0013] The turbine cylinder narrow space drilling tool, wherein the extension transmission base further comprises a thrust bearing 16, and the shaft sleeve 14 is rotatably installed in the extension body 7 through at least one thrust bearing 16.

[0014] The turbine cylinder narrow space drilling tool, wherein the upper part of the connecting rod 3 is in a circular truncated cone type structure with the outer diameter of the upper part being larger than that of the lower part, the middle part of the connecting rod 3 is provided with a reduced diameter structure with a reduced outer diameter, the tapered roller bearing 5 is installed on the reduced diameter structure, the lower part of the connecting rod 3 is a long shaft with an equal cross section, and the lower end of the connecting rod 3 is provided with a clamping structure matched with the upper end of the adapter shaft 6.

[0015] The turbine cylinder narrow space drilling tool, wherein the upper end of the shell is provided with a clamping sleeve 1 matched with the main shaft sleeve, a plurality of tightening screws 2 are assembled on the clamping sleeve 1, and the assembly of the clamping sleeve 1 and the main shaft sleeve is achieved by tightening the plurality of tightening screws 2; the upper part of the connecting rod 3 is provided with an inclined iron 4, and the main shaft of the drilling machine and the upper part of the connecting rod 3 are in transmission connection through the inclined iron 4.

[0016] The turbine cylinder narrow space drilling tool, wherein the lower part of the shell is provided with a transition section structure with a reduced inner diameter, the tapered roller bearing 5 is installed in the transition section structure, and a plurality of reinforcing ribs are welded on the shell.

[0017] The utility model discloses have the positive effect that compared with the prior art is that

[0018] (1) in the utility model, the drill press spindle shaft sleeve does not rotate, and the drill press spindle rotation drives the connecting rod rotation, and the connecting rod drives the adapter shaft, and the adapter shaft drives the driving gear, and the driving gear drives the transmission gear, and the transmission gear drives the drill bit in the shaft sleeve rotation, and the drill press spindle axial feed can use the drilling tool to drill in the place where the drill press spindle cannot reach. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structure schematic view of a turbine cylinder narrow space drilling tool of the utility model.

[0020] Figure 2 It is a partial enlarged view of a turbine cylinder narrow space drilling tool of Figure 1 .

[0021] Figure 3 It is a bottom view of a turbine cylinder narrow space drilling tool of the utility model.

[0022] In the drawings: 1, clamping sleeve, 2, tightening screw, 3, connecting rod, 4, inclined iron, 5, tapered roller bearing, 6, adapter shaft, 7, lengthening body, 8, driving gear, 9, ball bearing, 10, key, 11, transmission gear, 12, transmission shaft, 13, copper sleeve, 14, shaft sleeve, 15, hexagon bolt, 16, thrust bearing. DETAILED DESCRIPTION

[0023] The utility model will be further described below in connection with the drawings and specific embodiment, but not as the limitation of the utility model.

[0024] Please refer to Figures 1 to 3 It is shown that a turbine cylinder narrow space drilling tool, wherein, include: clamping sleeve 1, tightening screw 2, connecting rod 3, inclined iron 4, tapered roller bearing 5, adapter shaft 6, lengthening body 7, driving gear 8, ball bearing 9, key 10, transmission gear 11, transmission shaft 12, copper sleeve 13, shaft sleeve 14, hexagon bolt 15, thrust bearing 16.

[0025] The use method is that the thrust bearing 16 is installed on the lengthened body 7, the outer circle of the shaft sleeve 14 is installed in the inner hole of the thrust bearing 16, the copper sleeve 13 is installed on the other end of the shaft sleeve 14, the transmission gear 11 is engaged with the outer tooth of the shaft sleeve 14, the transmission shaft 12 is inserted into the inner hole of the transmission gear 11, one end of the transmission shaft 12 is installed into the positioning hole of the lengthened body 7, the transmission gear 11 is engaged with the driving gear 8, the inner hole of the driving gear 8 is fixed with the adapter shaft 6 through the key 10, the adapter shaft 6 is installed with the ball bearing 9 at both ends, the lengthened body gland is fastened by the hexagonal bolt 15, and then becomes an integrated body. The adapter shaft 6 is connected with the connecting rod 3 through the tooth-shaped key, the lengthened body 7 is installed with the clamping sleeve 1 on the surface, the tapered roller bearing 5 is installed in the inner hole of the clamping sleeve 1, one end of the connecting rod 3 is installed in the inner hole of the tapered roller bearing 5, the taper handle at the other end is installed in the inner hole of the main shaft of the drilling machine, and the inclined iron 4 is used for fixing. At the same time, the clamping sleeve 1 is installed on the shaft sleeve of the main shaft of the drilling machine, the upper part of the clamping sleeve 1 is provided with a radial gap, a light hole is drilled on one side of the gap, a screw hole is processed on the other side, the tightening screw 2 is screwed into the screw hole through the light hole, the radial deformation of the gap is generated, and the clamping sleeve 1 is fixed on the shaft sleeve of the main shaft of the drilling machine. When working, the shaft sleeve of the main shaft of the drilling machine does not rotate, the main shaft of the drilling machine rotates to drive the connecting rod 3 to rotate, the connecting rod 3 drives the adapter shaft 6 to rotate, the adapter shaft 6 drives the driving gear 8 to rotate, the driving gear 8 drives the transmission gear 11 to rotate, and the transmission gear 11 drives the drill bit in the shaft sleeve 14 to rotate. At the same time, the main shaft of the drilling machine is axially fed, so that the drilling tool can be used to drill holes in places where the main shaft of the drilling machine cannot reach.

[0026] Further, in a preferred embodiment, the thrust bearing is installed on the lengthened body to install the outer circle of the shaft sleeve in the inner hole of the thrust bearing, and the copper sleeve is installed on the other end of the shaft sleeve.

[0027] Further, in a preferred embodiment, the transmission gear is engaged with the outer tooth of the shaft sleeve, the transmission shaft is inserted into the inner hole of the transmission gear, one end of the transmission shaft is installed into the positioning hole of the lengthened body, and the transmission gear is engaged with the driving gear.

[0028] Further, in a preferred embodiment, the inner hole of the driving gear is fixed with the adapter shaft through the key, the ball bearing is installed at both ends of the adapter shaft, and the lengthened body gland is fastened by the hexagonal bolt to become an integrated body.

[0029] Further, in a preferred embodiment, the adapter shaft is connected with the connecting rod through the tooth-shaped key, the clamping sleeve is installed on the upper surface of the lengthened body, the tapered roller bearing is installed in the inner hole of the clamping sleeve, one end of the connecting rod is installed in the inner hole of the tapered roller bearing, the taper handle at the other end is installed in the inner hole of the main shaft of the drilling machine, and the inclined iron is used for fixing.

[0030] Further, in a preferred embodiment, the clamping sleeve is installed on the shaft sleeve of the main shaft of the drilling machine, the upper part of the clamping sleeve is provided with a radial gap, a light hole is drilled on one side of the gap, a screw hole is processed on the other side, the tightening screw is screwed into the screw hole through the light hole, the radial deformation of the gap is generated, and the clamping sleeve is fixed on the shaft sleeve of the main shaft of the drilling machine.

[0031] Further, in a preferred embodiment, the drill spindle sleeve does not rotate, the drill spindle rotates to drive the connecting rod to rotate, the connecting rod drives the adapter shaft, the adapter shaft drives the driving gear, the driving gear drives the transmission gear, and the transmission gear drives the drill bit in the sleeve to rotate.

[0032] Further, in a preferred embodiment, the drill spindle sleeve does not rotate, the drill spindle rotates to drive the connecting rod to rotate, the connecting rod drives the adapter shaft, the adapter shaft drives the driving gear, the driving gear drives the transmission gear, and the transmission gear drives the drill bit in the sleeve to rotate.

[0033] The utility model discloses simple structure, safe operation can drill in the part that the drill spindle reaches.

[0034] The above is only the preferred embodiment of the utility model, and does not limit the implementation mode and protection scope of the utility model.

[0035] The utility model discloses still have the following implementation mode on the basis above:

[0036] In the further embodiment of the utility model, the upper outer wall of the connecting rod 3 is provided with an inclined iron 4, and the drill spindle and the upper part of the connecting rod 3 are drivingly connected through the inclined iron 4, which is similar to key connection in connection and transmission mode. The connecting rod 3 is driven to rotate by the drill spindle, and is driven by the transmission mechanism assembly, so that the sleeve 14 rotates. The drill bit is installed in the sleeve 14, and the rotation of the drill bit realizes the function of hole opening.

[0037] In the further embodiment of the utility model, the axis of the sleeve 14 and the axis of the connecting rod 3 are parallel to each other, which realizes the function of applying power at the connecting rod 3 and opening holes at the sleeve 14. The lengthened transmission base has small size and can realize drilling in the narrow space of the steam turbine cylinder.

[0038] In the further embodiment of the utility model, the transmission mechanism assembly is a gear meshing transmission assembly, which has high strength and stable gear transmission, and has high strength and precision to realize transmission and further realize the function of the drill bit in the sleeve 14 rotating and opening holes.

[0039] In the further embodiment of the utility model, each transmission gear 11 is assembled on a transmission shaft 12 through a copper sleeve 13, which effectively reduces the wear of the transmission gear 11 and the copper sleeve 13. Compared with key connection, the copper sleeve 13 does not need to be installed on the transmission shaft 12 and the transmission gear 11 to process key grooves, avoiding the problem of reduced shaft strength caused by slotting, saving the precise machining step of the key groove, reducing the manufacturing cost and time, and the copper sleeve 13 transmits load through sliding friction. Compared with the local contact of key connection, the stress distribution is more uniform, the risk of stress concentration is reduced, the copper material has self-lubricating property, the friction loss can be reduced, the service life is prolonged, and it is suitable for low-speed or intermittent operation scene.

[0040] In the further embodiment of the utility model, the upper part of the connecting rod 3 is a circular truncated cone structure with the outer diameter of the cross section increasing from top to bottom, the upper end of the connecting rod 3 is thin, the connection of the main shaft of the drilling machine and the connecting rod 3 is facilitated, meanwhile, the circular truncated cone structure increases the contact area between the two, avoiding the breakage of the connecting rod 3 in the high-speed rotation process driven by the main shaft of the drilling machine.

[0041] In the further embodiment of the utility model, the upper end of the shell is provided with a clamping sleeve 1 matched with the main shaft sleeve, a plurality of tightening screws 2 are assembled on the clamping sleeve 1, the assembly between the clamping sleeve 1 and the main shaft sleeve is realized by screwing the plurality of tightening screws 2, the structure is more suitable for the assembly between the two, meanwhile, the coaxial transmission of the main shaft of the drilling machine and the connecting rod 3 is ensured.

[0042] The above is only the preferable embodiment of the utility model, and does not limit the implementation mode and protection scope of the utility model, for the person skilled in the art, it should be realized that the scheme obtained by the equivalent replacement and obvious change of the utility model specification and drawing content should be contained in the protection scope of the utility model.

Claims

1. A drilling tool for the confined space of a steam turbine cylinder, characterized in that, include: The spindle connection mechanism and the extended transmission base are mounted on the extended transmission base and are used to connect with the spindle bushing and the drill spindle. The spindle connection mechanism includes: a housing, a connecting rod (3) and a tapered roller bearing (5). The connecting rod (3) is installed in the housing through the tapered roller bearing (5). The upper end of the drilling machine spindle and the connecting rod (3) are connected and drive the connecting rod (3) to rotate around its own axis. The extended transmission base includes: a transition shaft (6), an extended body (7), a transmission mechanism assembly, and a bushing (14). The lower end of the housing is connected to the extended body (7), the lower end of the connecting rod (3) is connected to the upper end of the transition shaft (6), and the bushing (14) is rotatably mounted on the extended body (7). The lower end of the bushing (14) is provided with an assembly groove for mounting drilling tools. The transmission mechanism assembly is installed inside the extended body (7), and the transition shaft (6) and the bushing (14) are connected by transmission through the transmission mechanism assembly. The connecting rod (3) drives the transition shaft (6) to rotate, thereby driving the bushing (14) to rotate around its own axis.

2. The drilling tool for confined spaces in a steam turbine cylinder according to claim 1, characterized in that, The transmission mechanism assembly includes a drive gear (8) and a key (10). A keyway is provided on the adapter shaft (6), and the adapter shaft (6) and the drive gear (8) are connected by the key (10).

3. The drilling tool for confined spaces in a steam turbine cylinder according to claim 2, characterized in that, The transmission mechanism assembly also includes: a transmission gear (11), a transmission shaft (12), and a copper sleeve (13). Multiple transmission shafts (12) are installed inside the extended body (7) and arranged parallel to each other. A copper sleeve (13) is fitted on each transmission shaft (12), and a transmission gear (11) is installed on each copper sleeve (13). Any two adjacent transmission gears (11) are meshed and connected for transmission.

4. The drilling tool for confined spaces in a steam turbine cylinder according to claim 3, characterized in that, The bushing (14) has external teeth on its outer periphery. The external teeth of the bushing (14) mesh with the transmission gear (11) at one end and are connected to the drive gear (8) at the other end.

5. The drilling tool for confined spaces in a steam turbine cylinder according to claim 4, characterized in that, The extended transmission base also includes: hexagonal bolts (15), the extended body (7) includes: an extended body body and an extended body cover, the extended body body and the extended body cover are connected by multiple hexagonal bolts (15), and the drive gear (8) and multiple transmission gears (11) are located between the extended body body and the extended body cover.

6. The drilling tool for confined spaces in a steam turbine cylinder according to claim 2, characterized in that, The extended transmission base also includes: ball bearings (9), and the adapter shaft (6) is installed in the extended body (7) through two ball bearings (9), with the two ball bearings (9) respectively located on the upper and lower sides of the drive gear (8).

7. The drilling tool for confined spaces in a steam turbine cylinder according to claim 2, characterized in that, The extended transmission base also includes a thrust bearing (16), and the bushing (14) is rotatably mounted in the extended body (7) via at least one thrust bearing (16).

8. The drilling tool for confined spaces in a steam turbine cylinder according to claim 2, characterized in that, The upper part of the connecting rod (3) is a frustum-shaped structure with the outer diameter of the cross section increasing from top to bottom. The middle part of the connecting rod (3) is provided with a reduced diameter structure with a decreasing outer diameter. The tapered roller bearing (5) is installed on the reduced diameter structure. The lower part of the connecting rod (3) is a long shaft with a uniform cross section. The lower end of the connecting rod (3) is provided with a snap-fit ​​structure that matches the upper end of the adapter shaft (6).

9. The drilling tool for confined spaces in a steam turbine cylinder according to claim 8, characterized in that, The upper end of the housing is provided with a clamping sleeve (1) that matches the spindle bushing. The clamping sleeve (1) is equipped with multiple tightening screws (2). The clamping sleeve (1) and the spindle bushing are assembled by tightening the multiple tightening screws (2). The upper outer wall of the connecting rod (3) is provided with a wedge (4). The upper part of the drill spindle and the upper part of the connecting rod (3) are connected by the wedge (4).

10. The drilling tool for confined spaces in a steam turbine cylinder according to claim 8, characterized in that, The lower part of the housing is provided with a transition section structure with a reduced inner diameter. The tapered roller bearing (5) is installed in the transition section structure. Multiple reinforcing ribs are also welded on the housing.

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