Taper pin hole reaming device for rotor impeller of steam turbine

Abstract

The utility model discloses a taper pin hole reaming device for a rotor impeller of a steam turbine, and belongs to the field of machining and assembling. A turbine rotor impeller taper pin hole reaming device comprises a transmission box fixed on a tripod, a large gear set connected with a reamer and a small gear set meshed with the large gear set are arranged in the transmission box, and the small gear set is connected with an electric hand drill through an electric hand drill connecting shaft. A cover plate is arranged on the right side of the transmission case, a stud perpendicular to the cover plate is arranged in the center of the cover plate, and the puller nut is in threaded connection with the stud. The taper pin hole reaming device solves the problem that a taper pin hole in a rotor impeller of a steam turbine is difficult to machine, through the large bevel gear and the small bevel gear which are meshed, the force application direction is changed, original manual operation is changed into electric hand drill force application, the taper pin hole in the impeller can be rapidly reamed, reaming quality is guaranteed, manpower can be saved, and machining efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of mechanical processing and assembly, and more specifically, to a device for a turbine rotor impeller hinge tapered pin hole. Background Technology

[0002] After the last blades of the turbine rotor impeller are installed, they are usually fixed with tapered pins. Drilling the pin hole requires drilling and reaming the impeller and the blade together. Since the pin hole is on the side of the impeller, it is not possible to machine ream it. Currently, it is usually reamed by hand by a fitter. However, the distance between the impellers is very small, and the rotor is a large component. It is not possible to adjust the position at will to cooperate with the fitter, making it difficult to apply force by hand reaming. The reaming efficiency is extremely low and it is difficult to guarantee the accuracy.

[0003] Therefore, there is an urgent need for a device for boring conical pins in turbine rotor impellers that can replace hand boring, in order to improve boring accuracy and processing efficiency. Utility Model Content

[0004] The purpose of this invention is to provide a device for boring tapered pin holes in a steam turbine rotor impeller. This device can be placed between two impellers and can quickly drill and boring tapered pin holes on the impeller using a hand drill, saving manpower and increasing efficiency.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A turbine rotor impeller hinge tapered pin hole device includes a transmission box fixed on a tripod. The transmission box contains a large gear set connected to a reamer and a small gear set meshing with the large gear set. The small gear set is connected to an electric drill via a connecting shaft. The right side of the transmission box is provided with a cover plate, and a stud perpendicular to the center of the cover plate is provided. A tightening nut is threadedly connected to the stud.

[0007] A further technical solution includes a bushing spindle, a large bevel gear, and a first angular contact ball bearing. The left end of the bushing spindle has a reamer mounting hole, and one side of the reamer mounting hole has a first threaded hole that mates with a tightening bolt. The center of the right end of the bushing spindle has a second threaded hole, and the middle of the bushing spindle has a first limiting step. A large bevel gear is fitted onto the right side of the first limiting step and fixed to the bushing spindle by a first flat key. The large bevel gear meshes with the small bevel gear in the small gear set. A first angular contact ball bearing is provided between the large bevel gear and the large gear set mounting hole on the transmission box. The first angular contact ball bearing is axially positioned by pressing a first bearing ring with a first screw installed on the transmission box. A first slotted large cylindrical head screw mates with the second threaded hole to lock the large bevel gear and the bushing spindle.

[0008] A further technical solution includes a small gear set comprising a drill connecting shaft, a small bevel gear, and a second angular contact ball bearing. The bottom of the drill connecting shaft is provided with a connecting handle connected to the drill chuck, and a third screw hole is located at the center of its top. A second limiting step is located at the bottom of the drill connecting shaft, and a small bevel gear is fitted above the second limiting step. The small bevel gear is fixed to the drill connecting shaft by a second flat key. The small bevel gear meshes with the large bevel gear in the large gear set. A second angular contact ball bearing is located between the small bevel gear and the small gear set mounting hole on the transmission box. The second angular contact ball bearing is axially positioned by pressing the second bearing retaining ring with a second screw installed on the transmission box. A second slotted large cylindrical head screw engages with the third screw hole to lock the small bevel gear and the drill connecting shaft.

[0009] A further technical solution is that the tightening nut is circular, with a screw hole at its center and an outer screw hole on its outer circumference. A hexagonal bolt is placed in the outer screw hole, and the nut is tightened by rotating the hexagonal bolt. Several straight grooves are provided between adjacent outer screw holes along the axial direction to facilitate wrench clamping during installation or disassembly.

[0010] In a further technical solution, the tripod is a height-adjustable tripod.

[0011] A further technical solution involves providing a sealing ring between the cover plate and the transmission box to ensure airtightness. Beneficial effects

[0012] 1. This utility model solves the problem of difficult machining of tapered pin holes in steam turbine rotor impellers due to the small distance between the impellers. This utility model changes the direction of force application by using two meshing bevel gears of different sizes, changing the original manual operation to the application of force by a hand drill. This allows for rapid reaming of tapered pin holes on the impeller, ensuring the quality of the reaming, saving manpower, and increasing processing efficiency.

[0013] 2. The tripod of this utility model is a height-adjustable tripod, which can be adjusted in height as needed. With the rotation of the top nut to tighten the thrust on the impeller, the perpendicularity of the reamer to the impeller surface can be ensured, making the reaming more accurate and improving the processing efficiency.

[0014] 3. This utility model has a simple structure, is easy to operate, and is highly practical. Attached Figure Description

[0015] Figure 1 This is the front view of this utility model;

[0016] Figure 2 This is a top view of the present invention installed between the steam turbines;

[0017] Figure 3 This is a schematic diagram of the large gear set;

[0018] Figure 4 This is a schematic diagram of the pinion gear set;

[0019] Figure 5 This is the front view of the tightened nut;

[0020] Figure 6 This is the left view of the tightened nut;

[0021] Figure 7 This is an assembly diagram of the tightening nut and the hexagonal bolt;

[0022] The diagram shows the following markings: 1. Transmission box; 2. Cover plate; 3. Tightening nut; 4. Stud; 5. Tripod; 6. Reamer; 7. Large gear set; 8. Small gear set; 9. Electric drill; 10. Steam turbine rotor; 11. Hex bolt; 7-1. Bushing spindle; 7-2. Large bevel gear; 7-3. First angular contact ball bearing; 7-4. Reamer mounting hole; 7-5. First screw hole; 7-6. Tightening bolt; 7-7. Second screw hole; 7-8. First flat key; 7-10. First limit step; 7-11. First screw; 7-12. First bearing pressure ring; 7-13. First slotted large cylindrical head screw; 8-1. Electric drill connecting shaft; 8-2. Small bevel gear; 8-3. Second angular contact ball bearing; 8-4. Connecting handle; 8-5. Third screw hole; 8-6. Second flat key; 8-8, Second limiting step; 8-9, Second screw; 8-10, Second bearing pressure ring; 8-11, Second slotted large cylindrical head screw; 1-1, Large gear set mounting hole; 1-2, Small gear set mounting hole; 3-1, Screw hole; 3-2, External screw hole; 3-3, Straight groove. Detailed Implementation

[0023] The present invention will now be described in detail with reference to embodiments and application examples. It should be noted that the embodiments described are preferred embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. The application and usage of the present invention are not limited to the application examples described. Example

[0024] like Figure 1-7 As shown, a turbine rotor impeller hinge tapered pin hole device includes a transmission box 1 fixed on a tripod 5. The transmission box 1 is provided with a large gear set 7 connected to a reamer 6 and a small gear set 8 meshing with the large gear set 7. The small gear set 8 is connected to a hand drill 9 through a hand drill connecting shaft. A cover plate 2 is provided on the right side of the transmission box 1. A stud 4 perpendicular to the cover plate 2 is provided at the center of the cover plate 2. A tightening nut 3 is threadedly connected to the stud 4.

[0025] The large gear set 7 includes a bushing spindle 7-1, a large bevel gear 7-2, and a first angular contact ball bearing 7-3. The left end of the bushing spindle 7-1 has a reamer mounting hole 7-4, and one side of the reamer mounting hole 7-4 has a first threaded hole 7-5 that mates with a tightening bolt 7-6. The center of the right end of the bushing spindle 7-1 has a second threaded hole 7-7. The middle of the bushing spindle 7-1 has a first limiting step 7-10, and the large bevel gear 7-2 is fitted onto the right side of the first limiting step 7-10 and connected via a first flat key. 7-8 Fix the large bevel gear 7-2 on the bushing spindle 7-1. The large bevel gear 7-2 meshes with the small bevel gear 8-2 in the small gear set 8. A first angular contact ball bearing 7-3 is provided between the large bevel gear 7-2 and the large gear set mounting hole 1-1 on the transmission box 1. The first angular contact ball bearing 7-3 is axially positioned by pressing the first bearing pressure ring 7-12 with the first screw 7-11 installed on the transmission box. The first slotted large cylindrical head screw 7-13 cooperates with the second screw hole 7-7 to lock the large bevel gear 7-2 and the bushing spindle 7-1.

[0026] The pinion gear set 8 includes a drill connecting shaft 8-1, a small bevel gear 8-2, and a second angular contact ball bearing 8-3. The bottom of the drill connecting shaft 8-1 has a connecting handle 8-4 that connects to the drill chuck, and a third screw hole 8-5 at the center of its top. The bottom end of the drill connecting shaft has a second limiting step 8-8, and the small bevel gear 8-2 is fitted onto the second limiting step 8-8. The small bevel gear 8-2 is fixed to the drill connecting shaft 8-1 by a second flat key 8-6. On -1, the small bevel gear 8-2 meshes with the large bevel gear 7-2 in the large gear set 7. A second angular contact ball bearing 8-3 is provided between the small bevel gear 8-2 and the small gear set mounting hole 1-2 on the transmission box 1. The second angular contact ball bearing 8-3 is axially positioned by pressing the second bearing pressure ring 8-10 with the second screw 8-9 installed on the transmission box. The second slotted large cylindrical head screw 8-11 cooperates with the third screw hole 8-5 to lock the small bevel gear 8-2 and the electric drill connecting shaft 8-1.

[0027] The tightening nut 3 is circular, with a screw hole 3-1 at its center and an outer screw hole 3-2 on its outer circumference. A hexagonal bolt 11 is located in the outer screw hole 3-2, and the nut 3 is tightened by rotating the hexagonal bolt 11. Several axially arranged straight grooves 3-3 are provided between adjacent outer screw holes 3-2 to facilitate wrench clamping during installation or disassembly. The hexagonal bolt increases the torque, making it easier to rotate the tightening nut and saving effort.

[0028] The tripod is a height-adjustable tripod, and the height of the tripod can be adjusted as needed to adjust the position of the reamer.

[0029] A sealing ring is provided between the cover plate and the transmission box to ensure airtightness.

[0030] The working method of this utility model is as follows:

[0031] 1. First, install the transmission box on the tripod, install the cover plate on the right side of the transmission box, install the top nut on the stud, and install the hex bolt on the top nut. The large gear set and small gear set inside the transmission box are meshed and connected.

[0032] 2. Move the device between the two impellers of the rotor, install the reamer in the reamer mounting hole of the large gear set, and fix the reamer with the tightening bolt. Control the position of the tightening nut by rotating the hexagonal bolt so that the two ends of the device (i.e., the reamer and the tightening nut) press against the impellers on both sides respectively.

[0033] 3. Insert the drill chuck of the electric drill into the connecting shank of the small gear set, start the electric drill, the electric drill drives the small gear set to rotate, the small gear set drives the large gear set to rotate, so that the reamer can rotate, and the reaming work can be performed. During the reaming process, rotate the tightening nut to make it press against the impeller, so that the reamer is subjected to force perpendicular to the impeller surface, pushing the reamer to drill and ream, so as to ensure the accuracy of the reaming.

Claims

1. A turbine rotor impeller hinge tapered pin hole device, comprising a transmission box fixed on a tripod, characterized in that: The transmission box contains a large gear set connected to the reamer and a small gear set meshing with the large gear set. The small gear set is connected to the electric drill via a connecting shaft. The right side of the transmission box has a cover plate with a stud perpendicular to it at the center. A tightening nut is threadedly connected to the stud.

2. The steam turbine rotor blade wheel hinge cone pin bore arrangement of claim 1, wherein: The large gear set includes a bushing spindle, a large bevel gear, and a first angular contact ball bearing. The left end of the bushing spindle has a reamer mounting hole, and one side of the reamer mounting hole has a first threaded hole that mates with a tightening bolt. The center of the right end of the bushing spindle has a second threaded hole, and the middle of the bushing spindle has a first limiting step. The large bevel gear is fitted onto the right side of the first limiting step and is fixed to the bushing spindle by a first flat key. The large bevel gear meshes with the small bevel gear in the small gear set. A first angular contact ball bearing is provided between the large bevel gear and the large gear set mounting hole on the transmission box. The first angular contact ball bearing is axially positioned by pressing the first bearing ring with a first screw installed on the transmission box. A first slotted large cylindrical head screw mates with the second threaded hole to lock the large bevel gear and the bushing spindle.

3. A steam turbine rotor blade wheel hinge cone pin bore arrangement according to claim 1 or 2 characterised in that: The pinion assembly includes a hand drill connecting shaft, a small bevel gear, and a second angular contact ball bearing. The bottom of the hand drill connecting shaft is provided with a connecting handle that connects to the hand drill chuck, and the top center of the connecting shaft is provided with a third screw hole. The bottom end of the hand drill connecting shaft is provided with a second limiting step, and the small bevel gear is fitted on the top of the second limiting step. The small bevel gear is fixed on the hand drill connecting shaft by a second flat key. The small bevel gear meshes with the large bevel gear in the large gear assembly. A second angular contact ball bearing is provided between the small bevel gear and the pinion assembly mounting hole on the transmission box. The second angular contact ball bearing is axially positioned by pressing the second bearing retaining ring with a second screw installed on the transmission box. A second slotted large cylindrical head screw cooperates with the third screw hole to lock the small bevel gear and the hand drill connecting shaft.

4. The steam turbine rotor blade wheel hinge cone pin bore arrangement of claim 1 wherein: The tightening nut is circular with a screw hole at its center and an outer screw hole on its outer circumference. A hexagonal bolt is placed in the outer screw hole, and the nut is tightened by rotating the hexagonal bolt. Several straight grooves are provided between adjacent outer screw holes along the axial direction.

5. The steam turbine rotor blade wheel hinge cone pin bore arrangement of claim 1 wherein: The tripod in question is a height-adjustable tripod.

6. A steam turbine rotor blade wheel hinge cone pin bore apparatus as defined in claim 1 wherein: A sealing ring is provided between the cover plate and the transmission box.

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