Integral clamping tool for processing box body of wind power gear box
By designing an integrated clamping fixture, the problems of unstable clamping and low precision in the processing of wind turbine gearbox housings were solved, achieving more efficient and higher precision processing results and reducing labor costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NANJING AVIS TRANSMISSION TECH
- Filing Date
- 2025-06-04
- Publication Date
- 2026-05-19
AI Technical Summary
The existing tooling fixtures used for processing wind turbine gearbox housings are not stable enough, have low clamping efficiency, are difficult to guarantee processing accuracy, and are costly.
An integrated clamping fixture is adopted. Through the design of an integrated fixture plate and fixture base, it is fixed to the machine tool worktable using T-type fixture bolts and round nuts. Combined with a pull-down process step to fix the box body, it is ensured that the box body does not shift or deform during processing.
It achieves more stable clamping, improves machining accuracy, reduces labor costs, simplifies the operation process, and improves machining efficiency and accuracy.
Smart Images
Figure CN224254787U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of wind turbine gearbox processing, specifically an integral clamping fixture for processing wind turbine gearbox housings. Background Technology
[0002] Due to its advantages such as being pollution-free and having low construction costs, wind power generation has experienced rapid development in recent years.
[0003] Gears, as one of the most common components in mechanical products, are crucial to these products. Gearboxes, as protective and supporting components of gear assemblies, also hold a vital position. The gearbox structure is generally divided into upper and lower structures or front and rear structures. In wind turbine gearboxes, the bearing holes and end faces require rough and fine machining after the upper and lower housings are assembled, or after the front cover and middle housing are assembled. Therefore, tooling fixtures are needed to clamp and secure the gearbox housing.
[0004] The existing tooling for processing upper and lower box structures generally uses shims and pressure plates to press the upper sides of the upper box and then fix it to the workbench. This method is inefficient.
[0005] The technical solution of existing technology 1 is as follows:
[0006] Based on the height of the gearbox's process steps provided by the designers, and according to the machine tool's machining stroke, the height of the shims is calculated. The height of the shims is determined by the height of the gearbox's process steps. If the process steps of the gearbox are of uniform height, then the height of the corresponding shims will also be uniform. If there is a certain height difference between the process steps on the left and right sides of the gearbox, then the corresponding shims must also have a corresponding height difference. The shims mentioned above are in direct contact with the process steps of the gearbox and serve as supports. The gearbox is clamped by pressure plates on both sides using long screws to press the outer contour of the upper gearbox.
[0007] The disadvantages of existing technology 1 are:
[0008] 1. The shim block contacts the process step of the box body. The box body is clamped by pressing the outer contour of the two sides of the box body with long screws and pressure plates. This clamping method is not stable enough.
[0009] 2. The method of clamping the box body by pressing it with long screws and pressure plates on both sides is time-consuming and labor-intensive. Generally, it is necessary to press two points on each side. If the force is uneven on one side, it is necessary to re-press it.
[0010] 3. The calibration fails after the chamber is tightened, and the bolts on both sides need to be loosened before adjustment can be made, which makes the calibration very inefficient.
[0011] 4. Since the pressure plate clamps the outer shell of the housing, the parts are processed under pressure. After the housing is machined, the bearing holes, after precision boring, will experience stress release after the bolts at the pressure plate are loosened, resulting in a certain decrease in the machining accuracy of the parts. Utility Model Content
[0012] This utility model provides an integral clamping fixture for processing wind turbine gearbox housings. Its purpose is to overcome the shortcomings of the existing technology, providing stable clamping, high processing accuracy, and low cost.
[0013] The technical solution adopted by this utility model to solve its technical problem is:
[0014] An integral clamping fixture for machining wind turbine gearbox housings is characterized by:
[0015] The integrated tooling plate is fixedly connected to the machine tool worktable;
[0016] After the tooling base fixing bolts pass through the through holes opened at the bottom of the left tooling base and the right tooling base respectively, they are screwed into the corresponding threaded holes of the integral tooling plate, thus fixing the left tooling base and the right tooling base to the integral tooling plate respectively.
[0017] The lower and upper boxes are combined to form the box body;
[0018] The left process step below the lower box is placed on the left tooling base. The tooling base connecting bolt passes through the through hole on the upper surface of the left tooling base and is screwed into the threaded hole on the lower surface of the left process step to fix the lower box to the left tooling base.
[0019] The right process step below the lower box is placed on the right tooling base. The tooling base connecting bolt passes through the through hole on the upper surface of the right tooling base and is screwed into the threaded hole on the lower surface of the right process step to fix the lower box to the right tooling base.
[0020] Both the left and right tooling bases have more than two cavities, and the bolt heads of the tooling base fixing bolts and the tooling base connecting bolts are located inside the internal cavities.
[0021] The right tooling base is higher than the left tooling base, and each internal cavity of the right tooling base is provided with reinforcing ribs connecting the two sides and the bottom.
[0022] The integral tooling plate is placed on the machine tool worktable. The T-shaped head of the T-shaped tooling bolt passes through the T-slot on the machine tool worktable, and the other side passes through the through hole on the integral tooling plate. The round nut is screwed onto the T-shaped tooling bolt and presses the integral tooling plate, thus pressing and fixing the integral tooling plate to the machine tool worktable.
[0023] Each T-type tooling bolt is fitted with two round nuts.
[0024] The advantages of this utility model are:
[0025] 1) In response to the inconsistent height of the process steps on the left and right sides of the box, corresponding tooling bases are prefabricated according to the height difference of the process steps on both sides. Furthermore, the tooling bases on both sides of this utility model are integral with each other, and the box is fixed by a pull-down method, making the clamping more stable.
[0026] 2) The pull-down tooling only applies force to the process step, while the bearing holes in the housing are not subjected to force or deformation. The pull-down tooling offers higher machining precision. Because it prevents stress deformation, the dimensions of the bearing holes can be better guaranteed after the housing is machined.
[0027] 3) The pull-down tooling structure is simpler, allowing for operation by a single person and reducing labor costs. Disassembly and assembly of parts before and after processing are also more convenient, saving time and effort. Attached Figure Description
[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0029] Figure 1 A simplified diagram of the tooling structure used for machining the upper and lower structural box bodies;
[0030] Figure 2 for Figure 1 A partial view;
[0031] Figure 3 for Figure 1 The partial view from direction B. Detailed Implementation
[0032] To more clearly illustrate the technical solution of this utility model, the accompanying drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort. To facilitate understanding of this utility model, a more detailed description of this utility model will be provided below in conjunction with the accompanying drawings and specific embodiments.
[0033] It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as being "connected" to another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "upper," "lower," "inner," "outer," "bottom," etc., used in this specification indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0034] like Figure 1 , Figure 2 , Figure 3 As shown:
[0035] This utility model provides an integral tooling for machining when the height of the process steps on the left and right sides of the upper and lower box structure is inconsistent.
[0036] There are four process steps at the bottom of the lower housing 1. These four process steps are divided into two groups, which are distributed on the left and right sides of the lower housing 1 respectively. Figure 1 The process steps on the left and right sides of the lower box 1 are not of equal height. The two process steps on the left side, 200, have the same height, and the two process steps on the right side, 300, also have the same height. Therefore, the four process steps of the lower box 1 have two different heights.
[0037] Each process step has a pre-machined threaded hole at its center. Since the bearing holes of the housing are distributed on the upper housing 2 and the lower housing 1 respectively, in order to ensure the cylindricity of the bearing holes, the upper housing 2 and the lower housing 1 need to be machined together.
[0038] The integral tooling plate 4 is placed on the machine tool worktable 3. Eight through holes 41 are pre-machined on the integral tooling plate 4 for installing T-bolts 5. The T-shaped head 51 of the T-bolt 5 passes through the T-slot 31 on the machine tool worktable 3, and the other side passes through the pre-drilled through holes 41 on the integral tooling plate 4. After all the T-bolts 5 are installed on the integral tooling plate 4, two round nuts 6 are screwed onto the T-bolts 5. The two round nuts 6 act as a loosening mechanism, pressing the integral tooling plate 4 firmly onto the machine tool worktable 3. A total of eight T-bolts 5 are needed to secure the integral tooling plate 4 on both the front and back sides.
[0039] Both the left tooling base 7 and the right tooling base 10 are integral castings. The biggest difference between these two tooling bases is that their heights and internal rib structures are different. The way these two tooling bases fix the process steps below the box is the same.
[0040] Before use, the upper and lower planes of the left tooling base 7 and the right tooling base 10 need to be pre-processed into flat surfaces to ensure the flatness of these two surfaces.
[0041] The left fixture base 7 resembles a box structure with three internal cavities 70. These cavities are primarily designed to provide space for the installation of the fixture base fixing bolts 8 and fixture base connecting bolts 9. The bolt heads of both the fixture base fixing bolts 8 and the fixture base connecting bolts 9 are located within the internal cavities 70. A total of 12 fixture base fixing bolts 8 are required for securing the left fixture base 7 to its lower left and right sides.
[0042] The right fixture base 10 is similar to a box structure, with three internal cavities 100. These cavities are primarily to provide space for the installation of the fixture base fixing bolts 8 and fixture base connecting bolts 9. The bolt heads of both the fixture base fixing bolts 8 and the fixture base connecting bolts 9 are located within the internal cavities 100. A total of 12 fixture base fixing bolts 8 are required for fixation on the lower left and right sides of the right fixture base 10.
[0043] The right tooling base 10 is higher than the left tooling base 7. Each internal cavity 100 of the right tooling base 10 is provided with reinforcing ribs 102 that connect the two sides and the bottom to improve the structural strength.
[0044] The lower part of the left tooling base 7 has 12 through holes 72 pre-drilled, with 6 holes on each side. The integral tooling plate 4 has 12 threaded holes 42 pre-drilled in the area where the left tooling base 7 is placed. After the 12 tooling base fixing bolts 8 are passed through the 12 through holes 72 pre-drilled in the lower part of the left tooling base 7, they are screwed into the corresponding threaded holes 42 of the integral tooling plate 4 to fix the left tooling base 7 onto the integral tooling plate 4.
[0045] Similarly, 12 through holes 102 are pre-drilled in the lower part of the right tooling base 10, with 6 holes on each side. 12 threaded holes 42 are pre-drilled in the area where the right tooling base 10 is placed on the integral tooling plate 4. After passing through the 12 through holes 102 pre-drilled in the lower part of the right tooling base 10, the 12 tooling base fixing bolts 8 are screwed into the corresponding threaded holes 42 of the integral tooling plate to fix the right tooling base 10 onto the integral tooling plate 4.
[0046] After the two tooling bases are fixed, place the assembled box body 1 and upper box body 2 onto the left tooling base 7 and the right tooling base 10.
[0047] The left-side process step 200 below the lower housing 1 is placed on the left tooling base 7.
[0048] Two through holes 71 are pre-drilled on the upper surface of the left tooling base 7, and a threaded hole 201 is pre-drilled on the lower surface of the left process step 200. The positions of the through holes 71 and the threaded holes 201 correspond to each other. After passing through the pre-drilled through holes 71 on the upper surface of the left tooling base 7, the two tooling base connecting bolts 9 are tightened onto the pre-drilled threaded holes 201 on the lower surface of the left process step 200 of the lower housing. The lower housing 1 is fixed to the left tooling base 7 by tightening the tooling base connecting bolts 9.
[0049] The right-side process step 300 below the lower housing 1 is placed on the right tooling base 10.
[0050] Two through holes 101 are pre-drilled on the upper surface of the right tooling base 10. The positions of the through holes correspond to the positions of the threaded holes 301 on the lower surface of the right process step 300 below the lower housing 1. After passing through the pre-drilled through holes 101 on the upper surface of the right tooling base 10, the two tooling base connecting bolts 9 are tightened onto the pre-drilled threaded holes 301 on the lower surface of the right process step 300 below the lower housing. The lower housing 1 is fixed to the right tooling base 10 by tightening the tooling base connecting bolts 9.
[0051] Finally, once all four process steps of the enclosure are fixed, the enclosure can proceed with subsequent processing.
[0052] The existing tooling uses the height of the gearbox's process steps provided by the designers to calculate the height of the shims based on the machine tool's machining stroke. The height of the shims is determined by the height of the gearbox's process steps. If the process steps of the gearbox are of uniform height, the height of the matching shims will also be uniform. If there is a height difference between the process steps on the left and right sides of the gearbox, the matching shims must also have a corresponding height difference. The shims mentioned above are in direct contact with the process steps below the gearbox and serve as support. The gearbox is clamped by pressing the outer contours of the upper two sides of the gearbox with long screws on both sides. After the pressure plates on both sides are clamped, the machine tool is calibrated. If the calibration data is not up to standard, both pressure plates must be removed before adjustment can be made, which is very inefficient.
[0053] This fixture is an optimized and improved version of the original fixture. Because the process steps on the left and right sides of the box to be machined are at different heights, this invention requires two separate fixture bases. These two separate bases are fixed to an integral fixture base plate, thus making the fixture a single unit. Simultaneously, through holes for bolts are added to the top cover of the fixture bases. Bolts are passed through these pre-drilled holes on the top cover of the fixture, and tightening the bolts generates a downward tension, ensuring that the box does not easily shift during machine tool processing. Secondly, the original fixture, by pressing the outer contours of the upper two sides of the box, caused deformation of the precision boring bearing holes after the box was machined if the bolts on both sides were loosened. This fixture, however, fixes the box by pulling down the process steps on the lower two sides of the box, preventing precision errors caused by deformation. Furthermore, this fixture is mainly suitable for machining boxes with upper and lower box structures and inconsistent process step heights on the left and right sides.
[0054] The various embodiments described in this specification are presented in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The above description of the disclosed embodiments enables those skilled in the art to implement or use this invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this invention. Therefore, this invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. An integral clamping fixture for machining wind turbine gearbox housings, characterized in that: The integrated tooling plate is fixedly connected to the machine tool worktable; After the tooling base fixing bolts pass through the through holes opened at the bottom of the left tooling base and the right tooling base respectively, they are screwed into the corresponding threaded holes of the integral tooling plate, thus fixing the left tooling base and the right tooling base to the integral tooling plate respectively. The lower and upper boxes are combined to form the box body; The left process step below the lower box is placed on the left tooling base. The tooling base connecting bolt passes through the through hole on the upper surface of the left tooling base and is screwed into the threaded hole on the lower surface of the left process step to fix the lower box to the left tooling base. The right process step below the lower box is placed on the right tooling base. The tooling base connecting bolt passes through the through hole on the upper surface of the right tooling base and is screwed into the threaded hole on the lower surface of the right process step to fix the lower box to the right tooling base. Both the left and right tooling bases have more than two cavities, and the bolt heads of the tooling base fixing bolts and the tooling base connecting bolts are located inside the internal cavities.
2. The integral clamping fixture for processing wind turbine gearbox housing as described in claim 1, characterized in that: The right tooling base is higher than the left tooling base, and each internal cavity of the right tooling base is provided with reinforcing ribs connecting the two sides and the bottom.
3. The integral clamping fixture for processing wind turbine gearbox housing as described in claim 1, characterized in that: The integral tooling plate is placed on the machine tool worktable. The T-shaped head of the T-shaped tooling bolt passes through the T-slot on the machine tool worktable, and the other side passes through the through hole on the integral tooling plate. The round nut is screwed onto the T-shaped tooling bolt and presses the integral tooling plate, thus pressing and fixing the integral tooling plate to the machine tool worktable.
4. The integral clamping fixture for processing wind turbine gearbox housing as described in claim 3, characterized in that: Each T-type tooling bolt is fitted with two round nuts.