Positioning machining device and method for variable pitch shaft key groove in cabin

Abstract

The machining method of the positioning machining device based on the variable pitch shaft key groove in the cabin comprises the steps that (1) the small vertical milling machine is arranged in the cabin; (2) the machining device is placed on a working table top of the small vertical milling machine, and the machining datum plane is horizontally placed on the working table top; (3) the shaft is rotated to the fixed position, the key groove faces downwards, and the existing key groove of the shaft is located below and matched with the positioning block for positioning; (4) the shaft is pressed and fixed through a left pressing block and a right pressing block by means of rotation of the screw rod; 5) selecting a milling cutter, and adjusting the position of the center of the milling cutter to enable the center line of the key slot, the center line of the milling cutter and the center line of the shaft to be in the same vertical plane; (6) a key groove above the shaft is machined; (7) after machining is completed, the pressing block is loosened, and the machining device and the small vertical milling machine are removed; key groove machining transformation is carried out on the output shaft of the variable-pitch motor in an existing fan, on-site machining in a cabin is facilitated by adopting convenient machining equipment, the machining efficiency is improved, and the operation reliability is improved after double grooves are adopted.

Description

Technical Field

[0001] The invention relates to the technical field of wind turbine generator sets, and in particular to a positioning and processing device and a processing method for a keyway of a variable pitch shaft in a cabin. Background Art

[0002] At present, the variable pitch system of Haizhuang 2000KW wind turbines in operation uses a flat key and keyway connection method for connecting the variable pitch motor and the variable speed gearbox. A keyway is opened on one side of the variable pitch motor output shaft and a flat key is inserted. A groove is opened on the gearbox input shaft. The two are rigidly connected. During the operation of the variable pitch system, the variable pitch motor drives the variable speed gearbox to reciprocate. It is often the case that the keyway of the variable pitch motor or the groove on the side of the gearbox is rubbed and squeezed by the stronger key, causing the keyway and groove brush to deform and damage. The rotation of the variable pitch motor cannot be linked to the rotation of the variable pitch gearbox, and a slipping situation occurs. At this time, the wind turbine reports a variable pitch fault and stops, and the variable pitch angle is usually beyond the normal range. This greatly increases the difficulty of maintenance, delays the maintenance progress, and causes a lot of power loss. Summary of the invention

[0003] The present invention aims to modify the keyway of the output shaft of the variable pitch motor in the existing wind turbine, and proposes a positioning and processing device and a processing method for the keyway of the variable pitch shaft in the cabin.

[0004] A positioning and processing device for a keyway of a variable pitch shaft in a cabin, comprising a bottom plate, a left pressing block, and a right pressing block, characterized in that:

[0005] Positioning grooves are provided on the left and right pressing blocks;

[0006] The two positioning grooves are used to press and fix the shaft. After fixation, each side of the positioning groove is tangent to the outer circle of the shaft.

[0007] The positioning groove is used to press and fix the shaft, and an opening is formed above the shaft and between the left pressing block and the right pressing block above the shaft;

[0008] The lower opening is used as a positioning process opening, and the upper opening is used as a machining process opening; the original keyway of the shaft is used for positioning at the positioning process opening, and a new keyway is machined on the shaft at the machining process opening.

[0009] A processing method based on a positioning processing device for a keyway of a variable pitch shaft in a cabin, characterized in that:

[0010] 1) Place a small vertical milling machine in the engine room;

[0011] 2) The processing device is placed on the working table of a small vertical milling machine, and the processing reference surface is placed flat on the working table;

[0012] 3) Rotate the shaft to a fixed position with the keyway facing downwards, and the existing keyway of the shaft cooperates with the positioning block at the bottom for positioning;

[0013] 4) Use the screw to rotate to press the left and right pressing blocks on the shaft;

[0014] 5) Select a milling cutter and adjust the position of the milling cutter center so that the center line of the keyway, the center line of the milling cutter and the center line of the shaft are in the same vertical plane;

[0015] 6) Process the keyway on the shaft;

[0016] 7) After the processing is completed, release the clamping block and remove the processing device and small vertical milling machine.

[0017] Advantages of this application's technical solution:

[0018] Open a common flat key of the same size on the symmetrical back of the single-side groove of the original variable pitch system shaft, open a groove of the same size symmetrically on the opposite side of the groove on the original gearbox side, and then purchase a common flat key to complete the transformation. Through analysis, the double keyway + double groove method is adopted, and the force of the key connection is changed from the original single-sided rigid connection to a double-sided connection, which reduces the force on the keyway by half. In addition, the keyway is opened on both sides, and both sides are subjected to force at the same time, and the force is evenly balanced, which greatly reduces the friction, extrusion damage, and deformation of the brush mouth of the variable pitch motor keyway or the gearbox side groove due to reciprocating motion. The resulting variable pitch failure is greatly reduced, the number of shutdowns and downtime are reduced, and the availability index of the wind turbine is improved, bringing obvious economic benefits. The keyway processing and transformation of the output shaft of the variable pitch motor in the existing wind turbine is carried out, and convenient processing equipment is used to facilitate on-site processing in the cabin, which improves the processing efficiency, and the operation reliability is improved after the double groove is changed. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is the structural diagram of the processing device;

[0020] In the figure: 1. clamping hand wheel, 2. screw seat, 3. side plate, 4. screw, 51. left clamping block, 52. right clamping block head, 6. output shaft, 7. processing port, 8. bottom plate, 9. positioning block, 10. positioning plate. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] For the current Haizhuang 2000KW wind turbine pitch system, the pitch motor is connected to the speed gearbox using a flat key and keyway connection. A keyway is opened on one side of the pitch motor output shaft and a flat key is inserted, and a groove is opened on the gearbox input shaft. The two are rigidly connected. During the operation of the pitch system, the pitch motor drives the speed gearbox to reciprocate. It is often the case that the pitch motor keyway or the gearbox side groove is rubbed and squeezed by the stronger key, causing the keyway and groove brush mouth to deform. The rotation of the pitch motor cannot drive the pitch gearbox to rotate, resulting in a slipping situation. At this time, the wind turbine reports a pitch failure and shuts down, and the pitch angle is usually beyond the normal range. According to the above situation, through analysis, the double keyway and double groove method is adopted, so that the force of the key connection is changed from the original single-sided rigid connection to a double-sided connection, so that the force on the keyway is reduced by half, and the keyways are opened on both sides, and both sides are subjected to force at the same time, and the force is evenly balanced, which greatly reduces the friction, extrusion damage, and deformation of the brush mouth of the variable pitch motor keyway or the gearbox side groove due to reciprocating motion, and the resulting variable pitch failures are greatly reduced.

[0023] In order to realize the keyway processing and modification of the output shaft of the variable pitch motor in the existing wind turbines, it is necessary to conveniently use processing equipment in the cabin.

[0024] like Figure 1 As shown, a positioning and processing device for a keyway of a variable pitch shaft in a cabin comprises a bottom plate 8, a left pressing block 51, and a right pressing block 52. A positioning groove is provided on the left pressing block.

[0025] The positioning groove adopts a V-shaped groove with an angle of 90°-150°.

[0026] The two locating grooves are used to press and fix the shaft. After fixation, each side of the locating groove is tangent to the outer circle of the shaft.

[0027] The depth of the positioning groove is 0.8-1.5 times the radius of the shaft.

[0028] The positioning groove is used to press and fix the shaft, and an opening is formed above the shaft and between the left pressing block and the right pressing block above.

[0029] The lower opening is used as a positioning process opening, and the upper opening is used as a processing process opening 7.

[0030] The left clamping block and the right clamping block are installed on the left and right side plates 3, and are connected to the screw seats 2 on the left and right side plates through screws 4. When the screw 4 is rotated by the hand wheel 1, the left clamping block and the right clamping block move toward or away from each other.

[0031] The middle part of the bottom plate 8 is used as a positioning area for installing and fixing the positioning plate 10. The positioning plate 10 is processed with a square groove, and the center line of the square groove is aligned with the center line of the shaft.

[0032] A positioning block 9 can be movably inserted into the square groove.

[0033] The width of the positioning block 9 is equal to the width of the keyway on the shaft 6, and the length of the positioning block is less than the length of the shaft keyway.

[0034] A clearance fit is formed between the positioning block 9 and the shaft keyway and the square groove.

[0035] The height of the positioning plate 10 can be selected in different sizes to match different shaft diameters.

[0036] The lower surface of the bottom plate 8 is processed to form a processing reference surface.

[0037] A positioning processing method for a keyway of a variable pitch shaft in a cabin comprises the following steps:

[0038] 1. Arrange a small vertical milling machine in the engine room.

[0039] 2. The processing device is placed on the work surface of the small vertical milling machine, and the processing reference surface is placed flat on the work surface for installation and fixation.

[0040] 3. Rotate the shaft to a fixed position with the keyway facing downward and the existing keyway of the shaft cooperating with the positioning block at the bottom.

[0041] Fixed positioning plates of different heights are selected according to the shaft diameter, and different positioning blocks are selected according to the keyway width of the shaft.

[0042] 4. Use the screw to rotate to press the left and right clamping blocks on the shaft to fix it.

[0043] 5. Select the milling cutter and adjust the position of the milling cutter center so that the center line of the keyway, the center line of the milling cutter and the center line of the shaft are in the same vertical plane;

[0044] 6. Process the keyway on the shaft.

[0045] 7. After processing is completed, release the clamping block and remove the processing device and small vertical milling machine.

[0046] After processing, the shaft of the variable pitch system is grooved on both sides, and can be keyed on both sides. At the same time, the coupling on the gearbox side can also be processed with grooves on both sides, so that the left and right double keyways and double grooves are used, so that the force of the key connection is changed from the original single-sided rigid connection to a double-sided connection, which reduces the force on the keyway by half. In addition, the keyways are opened on both sides, and the forces are applied on both sides at the same time, and the forces are evenly balanced, which greatly reduces the friction, extrusion damage, and deformation of the brush mouth of the variable pitch motor keyway or the groove on the gearbox side due to reciprocating motion, and the resulting variable pitch faults are greatly reduced.

[0047] In this application, the processing device is used to eliminate the need to remove the variable pitch system shaft and move it to the factory for processing. The original installation position inside the cabin is used for pressing and positioning and processing the opposite keyway, which improves the processing efficiency. After changing to a double groove, the operating reliability is improved.

[0048] In the description of the present invention, it is necessary to understand that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the orientations or positional relationships 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, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0049] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0050] Finally, it should be noted that the above description is only an explanation of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail, those skilled in the art can still modify the technical solutions described above or replace some of the technical features with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A positioning and processing device for a keyway of a variable pitch shaft in a cabin, comprising a bottom plate, a left pressing block, and a right pressing block, characterized in that: Positioning grooves are provided on the left and right pressing blocks; The two positioning grooves are used to press and fix the shaft. After fixation, each side of the positioning groove is tangent to the outer circle of the shaft. The positioning groove is used to press and fix the shaft, and an opening is formed above the shaft and between the left pressing block and the right pressing block above the shaft; The lower opening is used as the positioning process opening, and the upper opening is used as the processing process opening; The original keyway of the shaft is used for positioning at the positioning process opening, and a new keyway is processed on the shaft at the processing process opening.

2. According to claim 1, a positioning and processing device for a keyway of a variable pitch shaft in a cabin, characterized in that: The middle part of the bottom plate is used as a positioning area for installing a fixed positioning plate. The positioning plate is processed with a square groove, and a positioning block can be movably inserted into the square groove. The positioning block cooperates with the shaft keyway to position the shaft.

3. According to claim 2, a positioning and processing device for a keyway of a variable pitch shaft in a cabin, characterized in that: A clearance fit is formed between the positioning block and the shaft keyway and the square groove.

4. According to claim 2, a positioning and processing device for a keyway of a variable pitch shaft in a cabin, characterized in that: The height of the positioning plate 10 can be selected in different sizes to match different shaft diameters.

5. The positioning and processing device for the keyway of a variable pitch shaft in a cabin according to claim 1, characterized in that: The left clamping block and the right clamping block are installed on the left and right side plates and connected to the screw seats on the left and right side plates through screws. When the screws rotate, the left clamping block and the right clamping block move toward or away from each other.

6. The positioning and processing device for the keyway of a variable pitch shaft in a cabin according to claim 1, characterized in that: The positioning groove is a V-shaped groove with an angle of 90°-150°; the depth of the positioning groove is 0.8-1.5 times the radius of the shaft.

7. The positioning and processing device for the keyway of a variable pitch shaft in a cabin according to claim 2, characterized in that: The centerline of the square slot is aligned with the centerline of the shaft.

8. The positioning and processing device for the keyway of a variable pitch shaft in a cabin according to claim 1, characterized in that: The lower surface of the base plate is processed to become the processing reference surface.

9. A processing method for positioning and processing a keyway of a variable pitch shaft in a cabin based on the positioning and processing device of claim 1, characterized in that: 1) Place a small vertical milling machine in the engine room; 2) The processing device is placed on the working table of a small vertical milling machine, and the processing reference surface is placed flat on the working table; 3) Rotate the shaft to a fixed position with the keyway facing downwards, and the existing keyway of the shaft cooperates with the positioning block at the bottom for positioning; 4) Use the screw to rotate to press the left and right pressing blocks on the shaft; 5) Select a milling cutter and adjust the position of the milling cutter center so that the center line of the keyway, the center line of the milling cutter and the center line of the shaft are in the same vertical plane; 6) Process the keyway on the shaft; 7) After the processing is completed, release the clamping block and remove the processing device and small vertical milling machine.

10. The processing method according to claim 9, characterized in that: In step 3), Fixed positioning plates of different heights are selected according to the shaft diameter, and different positioning blocks are selected according to the keyway width of the shaft.

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