A hydroelectric power station thrust head deep hole on-site processing mechanism

Abstract

The utility model relates to mechanical processing technical field, concretely relates to a hydroelectric power station thrust head deep hole field processing mechanism, including the drilling machine subassembly and bearing seat fixed frock, the drilling machine subassembly is connected on the end plane of rotor pivot through the adapter plate, the bearing seat fixed frock is detachably connected on the rotor support, the bearing seat fixed frock is threaded in the cutter, the cutter is connected the drilling machine subassembly through the extension rod, the drilling machine subassembly drives the cutter rotation, the bearing seat fixed frock includes at least two fixed flanges, connects several fixed screw rods of several fixed flanges in series, the fixed screw rod is connected the bearing seat through the nut, the utility model has the advantages of simple operation, strong practicality, combines the actual working condition of hydroelectric power station site, solves the problem that the hydroelectric power station site drills and hews large taper pin hole after the large vertical water turbine generator replaces the thrust head.

Description

Technical Field

[0001] This utility model relates to the field of mechanical processing technology, specifically to a deep hole machining mechanism for a hydropower station thrust head. Background Technology

[0002] Replacing the thrust head of a large vertical hydro-generator unit requires assembling the new thrust head with the original rotor support and main shaft, followed by drilling tapered pin holes in both the thrust head and the rotor support. Due to site constraints and the unique location of the tapered pin holes, traditional drilling tools are unsuitable, necessitating the design of an on-site thrust head machining mechanism.

[0003] For example, Chinese patent application CN 109604680 A discloses a deep hole machining fixture suitable for maintenance sites. The fixture includes a support platform with support screws mounted vertically at both ends. A magnetic drill is mounted on the support platform, and a coupling sleeve is mounted on the working end of the magnetic drill. An extension rod is mounted on the end of the coupling sleeve away from the magnetic drill. An upper positioning sleeve is mounted on the support platform, and the extension rod extends vertically through the upper positioning sleeve and downwards. A drill bit and a top rod for fixing the drill bit are mounted on the extension rod, and a lower positioning sleeve is mounted on the drill bit. This invention can achieve deep hole machining at maintenance sites and is adaptable to various complex working environments. However, its shortcomings include the need for multiple movements of the fixture around the rotor support when applying it to the machining of tapered pin holes in the thrust head and rotor support of a hydroelectric power station; the lack of a bearing seat fixing fixture located at the through hole position of the rotor support; and the inability to guarantee the eccentricity of the cutting tool due to the long extension rod. Utility Model Content

[0004] In view of the fact that the existing on-site deep hole machining fixtures cannot well adapt to the working conditions of matching holes between the thrust head and rotor support of large vertical hydro-generator sets, this utility model proposes a mechanism specifically for on-site matching holes of the thrust head of large vertical hydro-generator sets. It eliminates the need to move the fixture separately for each matching hole and has a bearing seat fixing fixture at the through hole of the rotor support to ensure the eccentricity of the cutting tool.

[0005] To achieve the above-mentioned technical effects, this utility model proposes:

[0006] A deep-hole machining mechanism for a hydroelectric power station thrust head includes a drilling machine assembly and a bearing housing fixing fixture. The drilling machine assembly is connected to the end plane of the rotor shaft via an adapter plate. The bearing housing fixing fixture is detachably connected to the rotor support. A cutting tool is inserted through the bearing housing fixing fixture. The cutting tool is connected to the drilling machine assembly via an extension rod. The drilling machine assembly drives the cutting tool to rotate. The bearing housing fixing fixture includes at least two fixing flanges and a plurality of fixing screws that connect the fixing flanges in series. The fixing screws are connected to the bearing housing via nuts.

[0007] The rotor shaft is installed in the rotor support, which has two central flanges, an upper and a lower one. The rotor shaft is fitted with a thrust head, which has two end faces that abut against the two central flanges of the rotor support, respectively.

[0008] The drilling machine assembly of this utility model can remove the base of the existing radial drilling machine, connect the inner column to the end plane of the rotor shaft through the adapter plate, and connect the drill bit through the extension rod. By rotating the drilling machine assembly, the position of the tool can be changed to make holes for the thrust head. The bearing seat fixing fixture can be detachably connected to the through hole of the central flange of the rotor support to radially position the tool, ensure the eccentricity of the tool during rotation, and improve the drilling accuracy.

[0009] The diameter of the central through hole of the fixed flange corresponds to the diameter of the cutting tool, and a number of through holes corresponding to the number of fixed screws are provided around the central through hole, with the fixed screws passing through the through holes.

[0010] The fixing screw includes a cylindrical section and a threaded section. The cylindrical section passes through the fixing flange and is fixedly connected. The threaded section is detachably connected to the bearing seat with a nut. The diameter of the central through hole of the bearing seat corresponds to the diameter of the shank of the tool.

[0011] The fixed flange includes a first flange and a second flange, which are respectively fixedly connected to both ends of the cylindrical section of the fixed screw. The first flange is detachably connected to the rotor bracket.

[0012] The first flange is connected to the rotor support section by welding or electric welding.

[0013] The fixed flange is square and has four through holes around the central through hole.

[0014] The bearing housing contains a ball bearing.

[0015] The drilling machine assembly includes an inner column, an outer column sleeved on the inner column and slidably connected to the inner column, the outer column having a rocker arm, the rocker arm being perpendicular to the inner column, a spindle box being sleeved on the rocker arm, and the spindle box being slidably connected to the rocker arm.

[0016] One end of the inner column is fixedly connected to the end plane of the rotor shaft via an adapter plate, and the other end is equipped with a motor. The motor is connected to a lead screw, which is threadedly connected to the rocker arm. The spindle box is equipped with a spindle motor and a tapered shank drill sleeve.

[0017] The beneficial effects of this utility model are:

[0018] 1. Highly practical, the drilling machine assembly can be a radial drilling machine, which can be easily modified; 2. Small error, the bearing housing fixing fixture reduces the eccentricity of the tool, and its simple structure results in low manufacturing cost; 3. Reduces the need for on-site personnel. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the deep hole machining mechanism for the thrust head of a hydropower station.

[0020] Figure 2 This is a schematic diagram of the bearing housing fixing fixture in Example 1.

[0021] Figure 3 This is a top view of the bearing housing fixing fixture in Embodiment 1.

[0022] Figure 4 This is a schematic diagram of the bearing housing fixing fixture in Example 2.

[0023] Icon labels:

[0024] 1. Bearing housing fixing fixture; 2. Drilling machine assembly; 3. Adapter plate; 4. Extension rod; 5. Cutting tool;

[0025] 6. Rotor support; 7. Rotor shaft; 8. Thrust head;

[0026] 101. First flange; 102. Second flange; 103. Third flange; 104. Fixing bolt; 105. Bearing housing; 106. Nut;

[0027] 201. Inner column; 202. Outer column; 203. Rocker arm; 204. Spindle box; 205. Motor; 206. Lead screw; 207. Spindle motor; 208. Taper shank drill bushing. Detailed Implementation

[0028] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0029] This utility model provides a field machining mechanism for deep holes in the thrust head of a hydropower station. The preferred embodiments of the field machining mechanism for deep holes in the thrust head of a hydropower station are described below.

[0030] Example 1

[0031] Reference Appendix Figure 1In this embodiment, the rotor shaft 7 passes through the rotor support 6, and the rotor shaft 7 is fitted with a thrust head 8. The rotor support 6 has upper and lower central flanges, and the thrust head 8 has upper and lower end faces that respectively abut against the two central flanges of the rotor support 6. The rotor support 6 includes upper and lower layers, each layer having a central flange. The central flange has 16 φ101 tapered pin holes around its central through hole. The upper and lower end faces of the thrust head 8 abut against the upper and lower central flanges of the rotor support 6, respectively, while leaving allowance for the tapered pin holes. The cutting tool 5 includes a reamer and a boring bar, etc.

[0032] In this embodiment, the deep hole machining mechanism for the hydropower station thrust head includes a drilling machine assembly 2 and a bearing seat fixing fixture 1. The drilling machine assembly 2 is connected to the end plane of the rotor shaft 7 via an adapter plate 3. The adapter plate is made of steel. In this embodiment, the drilling machine assembly 2 is a rocker arm 203 drilling machine. After disassembling the base of the rocker arm 203 drilling machine, the adapter plate 3 is connected by high-strength bolts. A bolt hole for bolting to the adapter plate 3 is provided at the end of the rotor shaft 7.

[0033] Reference Appendix Figure 2 and 3 The bearing housing fixing fixture 1 is detachably connected to the rotor support 6. A cutting tool 5 passes through the bearing housing fixing fixture 1. The cutting tool 5 is connected to the drilling assembly 2 via an extension rod 4, and the drilling assembly 2 drives the cutting tool 5 to rotate. One end of the extension rod 4 has an internal thread, and the shank of the cutting tool 5 has an external thread. The cutting tool 5 is threadedly connected to the extension rod 4. The outer diameter of the extension rod 4 is the same as the outer diameter of the shank of the cutting tool 5. The bearing housing fixing fixture 1 includes two fixing flanges, namely the first flange 101 and the second flange 102, which are connected in series by four fixing screws 104. It also includes a bearing housing 105, which is fixed to the fixing screws 104 by a pair of nuts 106 and is close to the second flange 102. The fixing screws 104 include a cylindrical section and a threaded section. The cylindrical section passes through the fixing flange and is fixedly connected. The threaded section is detachably connected to the bearing housing 105 by the pair of nuts 106.

[0034] In this embodiment, the fixing flange is made of square steel plate, and four through holes for the fixing screw 104 are provided around the central through hole. The two flanges are stacked on top of each other during manufacturing, and the central through hole and the four through holes around it are machined simultaneously. Since the first flange 101 needs to be fixed to the rotor support 6, the thickness of the first flange 101 is greater than the thickness of the second flange 102. The diameter of the central through hole of the fixing flange corresponds to the diameter of the cutting tool 5, and is greater than or equal to the diameter of the cutting tool 5. After the four fixing rods connect the first flange 101 and the second flange 102 in series, the first flange 101 and the second flange 102 are located at the two ends of the cylindrical section of the fixing screw 104, respectively, and are welded together as a whole. The first flange 101 is away from the threaded section of the fixing screw 104, and the second flange 102 is close to the threaded section of the fixing screw 104. The first flange 101 is connected to the rotor support 6 by surface welding or spot welding, facilitating removal after machining of individual tapered pin holes.

[0035] The diameter of the central through hole of the bearing housing 105 corresponds to the diameter of the shank of the cutting tool 5. The bearing housing 105 has a built-in ball bearing to ensure that the cutting tool 5 will not have a large radial deviation during hole machining, thus ensuring the accuracy of the tapered pin hole. After the bearing housing 105 is connected to the fixing screw 104, the distance between the end face of the bearing housing 105 away from the first flange 101 and the end face of the first flange 101 away from the bearing housing 105 is less than the overall height of the cutting tool 5. This setting allows the fixing position of the bearing housing fixing fixture 1 on the rotor support 6 to be determined by the cutting tool 5 after the installation of the cutting tool 5 and the bearing housing fixing fixture 1 is completed.

[0036] Drilling machine assembly 2 is a radial arm drilling machine 203 with its base removed. It includes an inner column 201 and an outer column 202 that is sleeved on and slidably connected to the inner column 201. The height of the outer column 202 is adjusted by its slidable connection to the inner column 201. The outer column 202 has a radial arm 203, which is perpendicular to the inner column 201. A spindle box 204 is sleeved on the radial arm 203, and the spindle box 204 is slidably connected to the radial arm 203. One end of the inner column 201 is fixedly connected to the end plane of the rotor shaft 7 via an adapter plate 3, and the other end is equipped with a motor 205. The motor 205 is connected to a lead screw 206, which is threadedly connected to the radial arm 203. The spindle box 204 is equipped with a spindle motor 207 and a taper shank drill sleeve 208. The extension rod 4 is connected to the taper shank drill sleeve 208 using a No. 5 Morse taper shank.

[0037] Taking the machining of the tapered pin hole on the lower end face of the thrust head 8 as an example, firstly, the adapter plate 3 is bolted to the end plane of the rotor shaft 7, and the drilling machine assembly 2 is hoisted onto the adapter plate 3 and bolted to fix it. The drilling machine assembly 2 is connected to the extension rod 4. The first flange 101 and the second flange 102 are threaded through the fixing screw 104 and welded to fix them. The cutting tool 5 is threaded between the first flange 101 and the second flange 102 and positioned on the surface of the hole to be machined. The shank of the cutting tool 5 is threaded through and positioned with the bearing seat 105, and then the bearing seat 105 is fixedly connected to the fixing thread using the paired nuts 106. The position of the cutting tool 5 and the hole to be machined is adjusted, and the extension rod 4 is passed through the reserved hole on the upper end face of the rotor support 6 and fixedly connected to the cutting tool 5. The bearing seat fixing fixture 1 is spot welded to the surface of the rotor support 6, and machining begins. After machining is completed, the extension rod 4 is separated from the tapered shank drill sleeve 208 and the cutting tool 5, respectively. The spot weld connection between the first flange 101 and the surface of the rotor support 6 is removed. The outer column 202 of the drilling machine assembly 2 is rotated, and the position of the cutting tool 5 and the next hole to be machined is adjusted. The bearing seat fixing fixture 1 is spot welded to the surface of the rotor support 6 again for machining. The above sequence is repeated to machine the lower end face of the thrust head 8.

[0038] Example 2

[0039] In this embodiment, the deep hole machining mechanism for the thrust head of the hydropower station includes a drilling machine assembly 2 and a bearing seat fixing fixture 1. In this embodiment, the drilling machine assembly 2 is a radial arm 203 drilling machine. After disassembling the base of the radial arm 203 drilling machine, a high-strength bolt is used to connect the adapter plate 3. A bolt hole for bolting the adapter plate 3 is provided at the end of the rotor shaft 7. The drilling machine assembly 2 is connected to the end plane of the rotor shaft 7 through the adapter plate 3.

[0040] Reference Appendix Figure 4 A cutting tool 5 is inserted into the bearing housing fixing fixture 1. The relative position of the cutting tool 5 to the hole to be machined is determined by the outer diameter of the cutting tool tip. It is spot-welded to the surface of the rotor support 6. The cutting tool 5 is connected to the drilling assembly 2 via an extension rod 4, and the drilling assembly 2 drives the cutting tool 5 to rotate. One end of the extension rod 4 has an internal thread, and the shank of the cutting tool 5 has an external thread. The cutting tool 5 is threadedly connected to the extension rod 4. The outer diameter of the extension rod 4 is the same as the outer diameter of the shank of the cutting tool 5. The bearing housing fixing fixture 1 includes three fixing flanges, which are, from top to bottom, a third flange 103, a second flange 102, and a first flange 101; and four fixing screws 104 that connect the three fixing flanges in series. The fixing screws 104 include a cylindrical section and a threaded section. The cylindrical section is inserted into the fixing flange and fixedly connected, and the threaded section is detachably connected to the bearing housing 105 by a pair of nuts 106. The bearing housing fixing fixture 1 is provided with a bearing housing 105, which is used to limit the radial displacement of the tool 5 during the machining process. It is fixed to the fixing screw 104 by a pair of nuts 106. The bearing housing 105 is close to the third flange 103.

[0041] In this embodiment, the fixing flange is made of square steel plate, and four through holes for the fixing screw 104 are provided around the central through hole. The three flanges are stacked on top of each other during manufacturing, and the central through hole and the four through holes around it are machined simultaneously. The diameter of the central through hole of the fixing flange corresponds to the diameter of the cutting tool 5, and is greater than or equal to the diameter of the cutting tool 5. Four fixing rods connect the first flange 101, the second flange 102, and the third flange 103 in series. The first flange 101 and the third flange 103 are located at the two ends of the cylindrical section of the fixing screw 104, and are welded together as a whole. The thickness of the first flange 101 is greater than that of the second flange 102 and the third flange 103, while the second flange 102 and the third flange 103 have the same thickness. The end face of the first flange 101 is welded to the surface of the rotor support 6, serving as a base; its thickness needs to be greater than that of the other two flanges. The three flanges are evenly spaced, and the second flange 102 and the third flange 103 further enhance the strength and stability of the bearing seat fixing fixture 1. The first flange 101 is located away from the threaded section of the fixing screw 104, while the third flange 103 is located close to the threaded section of the fixing screw 104. The first flange 101 is connected to the rotor support 6 by surface welding or spot welding, which facilitates removal after the individual tapered pin holes have been machined.

[0042] The diameter of the central through hole of the bearing housing 105 corresponds to the diameter of the shank of the tool 5. The bearing housing 105 has a built-in ball bearing to ensure that the tool 5 will not have a large radial deviation during hole machining, thus ensuring the accuracy of the tapered pin hole.

[0043] Drilling machine assembly 2 is a radial arm drilling machine 203 with its base removed. It includes an inner column 201 and an outer column 202 that is sleeved on and slidably connected to the inner column 201. The height of the outer column 202 is adjusted by its slidable connection to the inner column 201. The outer column 202 has a radial arm 203, which is perpendicular to the inner column 201. A spindle box 204 is sleeved on the radial arm 203, and the spindle box 204 is slidably connected to the radial arm 203. One end of the inner column 201 is fixedly connected to the end plane of the rotor shaft 7 via an adapter plate 3, and the other end is equipped with a motor 205. The motor 205 is connected to a lead screw 206, which is threadedly connected to the radial arm 203. The spindle box 204 is equipped with a spindle motor 207 and a taper shank drill sleeve 208. The extension rod 4 is connected to the taper shank drill sleeve 208 using a No. 5 Morse taper shank.

[0044] Taking the enlargement of the through hole in the lower layer of the rotor support 6 as an example, firstly, the adapter plate 3 is bolted to the end plane of the rotor shaft 7. The drilling machine assembly 2 is hoisted onto the adapter plate 3 and bolted in place. The drilling machine assembly 2 is connected to the extension rod 4. The first flange 101, the second flange 102, and the third flange 103 are threaded through the fixing screw 104 and welded in place. The cutting tool 5 is inserted into the central through hole of the three fixing flanges and positioned on the surface of the hole to be machined. The shank of the cutting tool 5 is inserted into and positioned with the bearing seat 105. Then, the bearing seat 105 is fixedly connected to the fixing thread using the paired nuts 106. The position of the cutting tool 5 and the hole to be machined is adjusted. The extension rod 4 is inserted through the reserved hole on the upper end face of the rotor support 6 and fixedly connected to the cutting tool 5. The bearing seat fixing fixture 1 is spot welded to the surface of the rotor support 6, and machining begins. After machining is completed, the extension rod 4 is separated from the tapered shank drill sleeve 208 and the cutting tool 5, respectively. The spot weld connection between the first flange 101 and the surface of the rotor support 6 is removed. The outer column 202 of the drilling machine assembly 2 is rotated, and the position of the cutting tool 5 and the next hole to be machined is adjusted. The bearing seat fixing fixture 1 is spot welded to the surface of the rotor support 6 again for machining. The above sequence is repeated to machine the lower end face of the thrust head 8.

[0045] This utility model is simple to operate and highly practical. Combined with the actual working conditions at hydropower stations, it solves the problem of simultaneously drilling and reaming large tapered pin holes on-site after replacing the thrust head of a large vertical turbine generator. It has advantages such as easy installation, flexible operation, small processing errors, fewer personnel required, and low manufacturing costs.

[0046] The above description is a preferred embodiment of the present utility model, used to illustrate the present utility model and its effects. It should be noted that, for those skilled in the art, for the purpose of making foreseeable improvements and modifications without departing from the principles of the present utility model, such improvements and modifications are also within the protection scope of the present utility model.

Claims

1. A field machining mechanism for deep holes in a hydropower station thrust head, characterized in that, The device includes a drilling assembly and a bearing housing fixing fixture. The drilling assembly is connected to the end plane of the rotor shaft via an adapter plate. The bearing housing fixing fixture is detachably connected to the rotor support. A cutting tool is inserted through the bearing housing fixing fixture. The cutting tool is connected to the drilling assembly via an extension rod. The drilling assembly drives the cutting tool to rotate. The bearing housing fixing fixture includes at least two fixing flanges and a plurality of fixing screws that connect the fixing flanges in series. The fixing screws are connected to the bearing housing via nuts.

2. The deep hole machining mechanism for a hydropower station thrust head according to claim 1, characterized in that, The diameter of the central through hole of the fixed flange corresponds to the diameter of the cutting tool, and a number of through holes corresponding to the number of fixed screws are provided around the central through hole, with the fixed screws passing through the through holes.

3. The deep hole machining mechanism for a hydropower station thrust head according to claim 2, characterized in that, The fixing screw includes a cylindrical section and a threaded section. The cylindrical section passes through the fixing flange and is fixedly connected. The threaded section is detachably connected to the bearing seat with a nut. The diameter of the central through hole of the bearing seat corresponds to the diameter of the shank of the tool.

4. The deep hole machining mechanism for a hydropower station thrust head according to claim 2, characterized in that, The fixed flange includes a first flange and a second flange, which are respectively fixedly connected to both ends of the cylindrical section of the fixed screw. The first flange is detachably connected to the rotor bracket.

5. The deep hole machining mechanism for a hydropower station thrust head according to claim 4, characterized in that, The first flange is connected to the rotor support section by welding or electric welding.

6. A deep-hole machining mechanism for a hydropower station thrust head according to claim 2, 4, or 5, characterized in that, The fixed flange is square and has four through holes around the central through hole.

7. A deep-hole machining mechanism for a hydropower station thrust head according to any one of claims 1 to 5, characterized in that, The bearing housing contains a ball bearing.

8. The deep hole machining mechanism for a hydropower station thrust head according to claim 1, characterized in that, The drilling machine assembly includes an inner column, an outer column sleeved on the inner column and slidably connected to the inner column, the outer column having a rocker arm, the rocker arm being perpendicular to the inner column, a spindle box being sleeved on the rocker arm, and the spindle box being slidably connected to the rocker arm.

9. The deep hole machining mechanism for a hydropower station thrust head according to claim 8, characterized in that, One end of the inner column is fixedly connected to the end plane of the rotor shaft via an adapter plate, and the other end is equipped with a motor. The motor is connected to a lead screw, which is threadedly connected to the rocker arm. The spindle box is equipped with a spindle motor and a tapered shank drill sleeve.

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