Turbine rotor journal coping device

Abstract

The utility model discloses a steam turbine rotor journal coping device, and belongs to the field of machining and assembling. The steam turbine rotor journal coping device comprises a transmission arm housing and a gear set arranged in the transmission arm housing, a motor drives a grinding wheel through the gear set, and the gear set is fixed in the transmission arm housing through a cover plate; the gear set comprises a main gear set, a plurality of intermediate gear sets and a transmission gear set, the motor is connected with a main shaft of the main gear set, the main gear set, the intermediate gear sets and the transmission gear set are sequentially meshed, and the grinding wheel is arranged on a transmission shaft of the transmission gear set; a tail fin matched with a machine tool cutter holder is arranged at the end, away from the grinding wheel, of the transmission arm housing. According to the utility model, the problem that the steam turbine rotor has a slight ellipse after being cut due to internal stress is solved, and the ellipse condition is eliminated and the jumping is reduced under the condition of ensuring that the size is not out of tolerance.

Description

Technical Field

[0001] This utility model relates to the field of mechanical processing and assembly, and more specifically, to a turbine rotor journal grinding device. Background Technology

[0002] Steam turbine rotors are large components, requiring long machining cycles, large cutting volumes, and high precision. Due to the properties of metallic materials, even after heat treatment, the product can still experience slight deformation due to internal stress caused by cutting or gravity. The journal is the part of the rotor with the highest precision requirements, affecting the runout that occurs during rotor operation. Even slight ellipticity of the journal needs to be corrected. If cutting with a tool is used, the cutting force may generate more internal stress, further affecting the roundness of the journal. If the internal stress problem can be solved by grinding, however, grinding is a technical challenge. Currently, grinding is generally only performed when elliptic runout of the journal diameter is present. Because the motor of a conventional grinding machine is obstructed by the turbine rotor impeller or oil baffle, workers can only manually grind the rotor with a file after it has been removed from the lathe. Manual grinding relies heavily on the operator's experience, and the grinding effect is very unstable when the rotor is static. It requires repeated measurement and constant adjustment of the grinding position, resulting in extremely low grinding efficiency.

[0003] Therefore, there is an urgent need for a turbine rotor journal grinding device that can mechanically grind the turbine rotor journal, ensuring grinding accuracy while solving the technical problem of elliptical deformation. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a turbine rotor journal grinding device. After the turbine rotor is machined on a turbine lathe, the device can be clamped to mechanically grind the elliptical parts of the journal, solving the problem of slight ellipticity caused by internal stress after cutting, so as to meet the drawing requirements, and the processing efficiency is high.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] A turbine rotor journal grinding device includes a transmission arm cover and a gear set disposed within the transmission arm cover. A motor drives a grinding wheel through the gear set, and a cover plate fixes the gear set within the transmission arm cover. The gear set includes a main gear set, several intermediate gear sets, and a transmission gear set. The motor is connected to the main shaft of the main gear set, and the main gear set, intermediate gear sets, and transmission gear sets mesh sequentially. The grinding wheel is disposed on the transmission shaft of the transmission gear set. The transmission arm cover has a tail fin at the end away from the grinding wheel that engages with a machine tool clip.

[0007] A further technical solution is provided in the transmission arm cover, which has a main gear mounting hole, several intermediate gear mounting holes and a transmission gear mounting hole. The main gear mounting hole is used to install the main gear set, the intermediate gear mounting hole is used to install the intermediate gear set, and the transmission gear mounting hole is used to install the transmission gear set.

[0008] A further technical solution includes a main gear set comprising a first deep groove ball bearing, a first bearing retaining ring, a main gear, and a main shaft. The top of the main shaft is provided with a first limiting step, and the bottom center of the main shaft is provided with a first screw hole. The main gear is sleeved on the main shaft and fixed to the main shaft by a first flat key. The main gear meshes with the intermediate gear in the adjacent intermediate gear set. A first deep groove ball bearing is sleeved between the main gear and the first limiting step. The first deep groove ball bearing is located between the main shaft and the main gear mounting hole. The first deep groove ball bearing is axially positioned by pressing the first bearing retaining ring with a first screw installed on the transmission arm cover. The first slotted large cylindrical head screw cooperates with the first screw hole to lock the main gear and the main shaft.

[0009] A further technical solution is that the intermediate gear set includes a second deep groove ball bearing, a positioning post, and an intermediate gear. The positioning post is fixed in the intermediate gear mounting hole by a second screw, and the positioning post extends out of the intermediate gear mounting hole. The second deep groove ball bearing is sleeved on the bottom of the positioning post, and the intermediate gear is sleeved on the second deep groove ball bearing. The intermediate gear meshes with the main gear in the adjacent main gear set, and / or the intermediate gear, and / or the transmission gear in the transmission gear set.

[0010] A further technical solution includes a transmission gear set comprising a first angular contact ball bearing, a second bearing retaining ring, a transmission gear, and a transmission shaft. The transmission shaft has a second threaded hole at its top and a third threaded hole at its bottom. A second limiting step is provided at the top of the transmission shaft. The transmission gear is fitted below the second limiting step and fixed to the transmission shaft by a second flat key. The transmission gear meshes with the intermediate gear of an adjacent intermediate gear set. The first angular contact ball bearing is fitted onto the transmission gear and is located between the mounting hole of the transmission gear and the transmission gear set. The first angular contact ball bearing is axially positioned by pressing the second bearing retaining ring with a third screw installed on the transmission arm cover. The second slotted large cylindrical head screw cooperates with the third threaded hole to lock the transmission gear and the transmission shaft. The internal hexagon screw cooperates with the second threaded hole to fix the grinding wheel to the transmission shaft.

[0011] A further technical solution involves providing a rubber sealing ring between the cover plate and the transmission arm housing to further ensure airtightness.

[0012] A further technical solution is that the transmission arm cover is provided with several lifting holes to facilitate lifting the transmission arm cover and installing it on a lathe.

[0013] In a further technical solution, the intermediate gear set has four sets. Beneficial effects

[0014] Compared with the prior art, the present invention has the following significant advantages:

[0015] 1. This utility model solves the problem of slight ellipticity in turbine rotors caused by internal stress after machining by grinding the rotor journal with a grinding wheel. It eliminates the ellipticity and reduces runout while ensuring that the dimensions are within tolerance.

[0016] 2. By setting up a transmission arm cover, this utility model can not only install the gear set inside it, but also clamp the device on a horizontal lathe, so that the grinding operation can be performed when the rotor is rotating on the horizontal lathe. The structure of the transmission arm cover avoids interference with other parts of the rotor (such as the impeller), and allows for more direct and precise grinding of the rotor shaft journal.

[0017] 3. This utility model has a simple structure, is easy to use, and has high grinding efficiency. Attached Figure Description

[0018] Figure 1 This is a main sectional view of the present invention;

[0019] Figure 2 This is an internal top view of the transmission arm housing;

[0020] Figure 3 This is a schematic diagram of the structure of the transmission arm cover;

[0021] Figure 4 This is a schematic diagram of the main gear set;

[0022] Figure 5 This is a schematic diagram of the intermediate gear set;

[0023] Figure 6 This is a schematic diagram of the transmission gear set.

[0024] Figure 7 This is a schematic diagram of the present invention for grinding rotor journals;

[0025] Markings in the diagram: 1. Transmission arm cover; 2. Motor; 3. Cover plate; 4. Grinding wheel; 5. Main gear set; 6. Intermediate gear set; 7. Transmission gear set; 8. Rubber sealing ring; 9. Lathe tool holder; 10. Rotor journal; 1-1. Tail fin; 1-2. Lifting hole; 1-3. Main gear mounting hole; 1-4. Intermediate gear mounting hole; 1-5. Transmission gear mounting hole; 4-1. Socket head cap screw; 4-2. Grinding wheel disc; 5-1. Main spindle; 5-2. First deep groove ball bearing; 5-3. First limiting step; 5-4. First screw; 5-5. First bearing pressure ring; 5-6. First flat key; 5-7. Main gear; 5-8. First slotted large cylindrical head screw; 5-9, First screw hole; 6-1, Positioning pin; 6-2, Second screw; 6-3, Second deep groove ball bearing; 6-4, Intermediate gear; 7-1, Drive shaft; 7-2, Drive gear; 7-3, First angular contact ball bearing; 7-4, Second limiting step; 7-5, Second bearing pressure ring; 7-6, Third screw; 7-7, Second flat key; 7-8, Second slotted large cylindrical head screw; 7-9, Second screw hole; 7-10, Third screw hole. Detailed Implementation

[0026] 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

[0027] like Figure 1-7 As shown, the turbine rotor journal grinding device includes a transmission arm cover 1 and a gear set disposed within the transmission arm cover 1. A motor 2 drives a grinding wheel 4 through the gear set, and a cover plate 3 fixes the gear set within the transmission arm cover 1. The gear set includes a main gear set 5, several intermediate gear sets 6, and a transmission gear set 7. The motor 2 is connected to the main shaft of the main gear set 5, and the main gear set 5, intermediate gear sets 6, and transmission gear sets 7 mesh sequentially. The grinding wheel 4 is disposed on the transmission shaft of the transmission gear set 7. The transmission arm cover 1 has a tail fin 1-1 at the end away from the grinding wheel 4 that cooperates with a machine tool clip 9.

[0028] The transmission arm cover 1 is provided with a main gear mounting hole 1-3, a number of intermediate gear mounting holes 1-4 and transmission gear mounting holes 1-5. The main gear mounting hole 1-3 is used to install the main gear set 5, the intermediate gear mounting holes 1-4 are used to install the intermediate gear set 6, and the transmission gear mounting holes 1-5 are used to install the transmission gear set 7.

[0029] The main gear set 5 includes a first deep groove ball bearing 5-2, a first bearing pressure ring 5-5, a main gear 5-7, and a main shaft 5-1. The top of the main shaft 5-1 is provided with a first limiting step 5-3, and the bottom center of the main shaft 5-1 is provided with a first screw hole 5-9. The main gear 5-7 is sleeved on the main shaft 5-1 and fixed to the main shaft 5-1 by a first flat key 5-6. The main gear 5-7 meshes with the intermediate gear 6-4 in the adjacent intermediate gear set 6. The first deep groove ball bearing 5-2 is sleeved between the main gear 5-7 and the first limiting step 5-3. The first deep groove ball bearing 5-2 is located between the main shaft 5-1 and the main gear mounting hole 1-3. The first deep groove ball bearing 5-2 is axially positioned by pressing the first bearing pressure ring 5-5 with a first screw 5-4 installed on the transmission arm cover 1. The first slotted large cylindrical head screw 5-8 cooperates with the first screw hole 5-9 to lock the main gear 5-7 and the main shaft 5-1.

[0030] The intermediate gear set 6 includes a second deep groove ball bearing 6-3, a positioning post 6-1, and an intermediate gear 6-4. The positioning post 6-1 is fixed in the intermediate gear mounting hole 1-4 by a second screw 6-2. The positioning post 6-1 extends out of the intermediate gear mounting hole 1-4. The second deep groove ball bearing 6-3 is sleeved on the bottom of the positioning post 6-1. The intermediate gear 6-4 is sleeved on the second deep groove ball bearing 6-3. The intermediate gear 6-4 meshes with the main gear 5-7 in the adjacent main gear set 5, and / or the intermediate gear 6-4, and / or the transmission gear 7-2 in the transmission gear set 7.

[0031] The transmission gear set 7 includes a first angular contact ball bearing 7-3, a second bearing retaining ring 7-5, a transmission gear 7-2, and a transmission shaft 7-1. The transmission shaft 7-1 has a second threaded hole 7-9 at its top and a third threaded hole 7-10 at its bottom. A second limiting step 7-4 is provided on the upper part of the transmission shaft 7-1. The transmission gear 7-2 is fitted below the second limiting step 7-4 and fixed to the transmission shaft 7-1 by a second flat key 7-7. The transmission gear 7-2 meshes with the intermediate gear 6-4 of the adjacent intermediate gear set 6. The first angular contact ball bearing 7-3 is sleeved on the transmission gear 7-2. The first angular contact ball bearing 7-3 is located between the transmission gear 7-2 and the transmission gear set mounting hole 1-5. The first angular contact ball bearing 7-3 is axially positioned by pressing the second bearing pressure ring 7-5 with the third screw 7-6 installed on the transmission arm cover 1. The second slotted large cylindrical head screw 7-8 cooperates with the third screw hole 7-10 to lock the transmission gear 7-2 and the transmission shaft 7-1. The internal hex screw 4-1 cooperates with the second screw hole 7-9 to fix the grinding wheel 4-2 on the transmission shaft 7-1.

[0032] A rubber sealing ring 8 is provided between the cover plate 3 and the transmission arm cover 1 to further ensure airtightness.

[0033] The transmission arm cover 1 is provided with several lifting holes 1-2 to facilitate lifting the transmission arm cover and installing it on a lathe.

[0034] The intermediate gear set has 4 sets.

[0035] The working method of this utility model is as follows:

[0036] 1. Use the lifting holes to lift the device first, and then clamp the tail fin onto the lathe tool holder so that the surface of the grinding wheel and the surface of the rotor journal are parallel and not eccentric;

[0037] 2. Start the motor. The motor drives the grinding wheel to rotate through the main gear set, intermediate gear set, and transmission gear set. Then start the horizontal lathe to make the rotor journal and the grinding wheel rotate in opposite directions. The grinding wheel can then be used to grind the rotor journal.

Claims

1. A turbine rotor journal grinding device, characterized in that: The device includes a transmission arm cover and a gear set housed within the transmission arm cover. A motor drives a grinding wheel through the gear set, and a cover plate fixes the gear set inside the transmission arm cover. The gear set includes a main gear set, several intermediate gear sets, and a transmission gear set. The motor is connected to the main shaft of the main gear set, and the main gear set, intermediate gear sets, and transmission gear sets mesh sequentially. The grinding wheel is mounted on the transmission shaft of the transmission gear set. The transmission arm cover has a tail fin at its end away from the grinding wheel that engages with a machine tool clip.

2. The turbine rotor journal grinding device according to claim 1, characterized in that: The transmission arm housing is provided with a main gear mounting hole, several intermediate gear mounting holes and a transmission gear mounting hole. The main gear mounting hole is used to install the main gear set, the intermediate gear mounting hole is used to install the intermediate gear set, and the transmission gear mounting hole is used to install the transmission gear set.

3. The turbine rotor journal grinding device according to claim 1 or 2, characterized in that: The main gear set includes a first deep groove ball bearing, a first bearing retaining ring, a main gear, and a main shaft. The top of the main shaft is provided with a first limiting step, and the center of the bottom of the main shaft is provided with a first screw hole. The main gear is sleeved on the main shaft and fixed to the main shaft by a first flat key. The main gear meshes with the intermediate gear in the adjacent intermediate gear set. A first deep groove ball bearing is sleeved between the main gear and the first limiting step. The first deep groove ball bearing is located between the main shaft and the main gear mounting hole. The first deep groove ball bearing is axially positioned by pressing the first bearing retaining ring with a first screw installed on the transmission arm cover. A first slotted large cylindrical head screw cooperates with the first screw hole to lock the main gear and the main shaft.

4. The turbine rotor journal grinding device according to claim 1 or 2, characterized in that: The intermediate gear set includes a second deep groove ball bearing, a positioning post, and an intermediate gear. The positioning post is fixed in the intermediate gear mounting hole by a second screw and extends out of the intermediate gear mounting hole. The second deep groove ball bearing is sleeved on the bottom of the positioning post, and the intermediate gear is sleeved on the second deep groove ball bearing. The intermediate gear meshes with the main gear in the adjacent main gear set, and / or the intermediate gear, and / or the transmission gear in the transmission gear set.

5. The turbine rotor journal grinding device according to claim 1 or 2, characterized in that: The transmission gear set includes a first angular contact ball bearing, a second bearing retaining ring, a transmission gear, and a transmission shaft. The transmission shaft has a second threaded hole at its top and a third threaded hole at its bottom. The upper part of the transmission shaft has a second limiting step. The transmission gear is sleeved below the second limiting step and fixed to the transmission shaft by a second flat key. The transmission gear meshes with the intermediate gear of the adjacent intermediate gear set. The first angular contact ball bearing is sleeved on the transmission gear and is located between the transmission gear and the mounting hole of the transmission gear set. The first angular contact ball bearing is axially positioned by pressing the second bearing retaining ring with a third screw installed on the transmission arm cover. A second slotted large cylindrical head screw cooperates with the third threaded hole to lock the transmission gear and the transmission shaft. An internal hexagon screw cooperates with the second threaded hole to fix the grinding wheel to the transmission shaft.

6. The turbine rotor journal grinding device according to claim 1, characterized in that: A rubber sealing ring is provided between the cover plate and the transmission arm cover.

7. The turbine rotor journal grinding device according to claim 1, characterized in that: The transmission arm cover is provided with several lifting holes.

8. The turbine rotor journal grinding device according to claim 1, characterized in that: The intermediate gear set has 4 sets.

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