Welding fixture for positioning tangent plane of paddle and angular direction of eccentric pin

Abstract

The utility model discloses a welding fixture for positioning the tangent plane of a paddle and the angular direction of an eccentric pin. The welding fixture comprises a base, a paddle root clamping and positioning assembly, a sample plate base, a chord sample plate, an adapter block and a positioning pin, the paddle root clamping and positioning assembly is installed on the base, the sample plate base is arranged on the base in a sliding mode and is positioned through scale marks on the base, the sample plate base can be locked on the base through the locking device, and the chord sample plate is arranged on the sample plate base in a sliding mode in the direction perpendicular to the sliding direction of the sample plate base; the adapter block is provided with a positioning pin opening, an eccentric pin opening and a mandrel, the mandrel is used for being inserted into the eccentric pin datum hole, the eccentric pin opening is used for containing and positioning the eccentric pin boss, and the positioning pin penetrates through the positioning pin opening and is inserted into the positioning pin hole in the base to achieve angular positioning of the adapter block. The positioning position of the blade tangent plane and the angular direction of the eccentric pin can be freely changed, the clamping requirement for welding of most blades is met, and the positioning accuracy, reliability and installation convenience are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical processing, in particular to a welding fixture for positioning the angular direction of a blade section and an eccentric pin. Background Art

[0002] The propeller pitch change mechanism often uses an eccentric pin part, which is used to drive the blade to rotate and achieve the blade rotation pitch change. This eccentric pin part is welded to the blade root jacket at the root of the blade. Figure 1 .

[0003] When welding parts with eccentric pins, it is necessary to ensure the angular relationship between the eccentric pin and a certain cross-section chord in the length direction of the blade, which is generally about 45°. The torsion angles of different types of blades are different, and the positions and angles of the eccentric pins are also different. Therefore, the welding tooling also needs to be newly made. Due to the large size of the tooling, it is difficult to manage the tooling. The welding station needs to use a crane to lift the tooling back and forth to weld different types of blades, and continuous processing is impossible. In addition, the traditional welding fixture locates the eccentric pin by placing a vertical block in the rotation direction of the eccentric pin to block the eccentric pin boss. In this method, the angle between the eccentric pin and the cross-section chord is greatly affected by the center distance of the eccentric pin part (the distance between the center line of the eccentric pin and the center line of the eccentric pin boss). When the blade angle is required to be 45°, the center distance theoretically increases by 0.1mm, the angle positioning error is about 0.01°, the eccentric pin positioning is inaccurate, and the reliability is low. Therefore, a universal welding fixture is urgently needed on site to reduce the number of tooling and the frequency of tooling replacement by workers, and to improve positioning accuracy and reliability. Utility Model Content

[0004] The purpose of the utility model is to provide a welding fixture for positioning the blade section and the angular direction of the eccentric pin, so as to solve the problems existing in the above-mentioned prior art. It can freely change the positioning position of the blade section and the angular direction of the eccentric pin, meet the clamping requirements of most blade welding, and improve the positioning accuracy, reliability and installation convenience.

[0005] To achieve the above purpose, the utility model provides the following solutions:

[0006] The utility model provides a welding fixture for positioning the blade section and the angular direction of the eccentric pin, comprising a base, a blade root clamping and positioning assembly, a template base, a chord template, a transfer block and a positioning pin;

[0007] The root clamping and positioning assembly is installed on the base and is used to clamp and position the root of the blade. The root clamping and positioning assembly includes a V-shaped fixed block and a V-shaped clamping block that cooperates with the V-shaped fixed block. On the end face of the open end of the V-shaped fixed block, there is a raised platform on the side away from the template base. The side of the V-shaped fixed block and the raised platform facing away from the template base are coplanar to form a positioning surface for axially positioning the root of the blade. After the outer sleeve of the root of the blade is placed in the V-shaped fixed block, the end face of the outer sleeve of the root of the blade abuts against the positioning surface, and the raised platform is higher than the center line of the root of the blade; on the end face of the open end of the V-shaped clamping block, there is a relief notch for making way for the raised platform;

[0008] The template base is slidably arranged on the base and is positioned by the scale line on the base. The template base can be locked on the base through a locking device. The chord template is slidably arranged on the template base along a direction perpendicular to the sliding direction of the template base, and the profile of the chord template coincides with the chord of the blade section;

[0009] The adapter block is provided with a positioning pin hole, an eccentric pin hole and a mandrel. The mandrel is used to insert into the eccentric pin reference hole, the eccentric pin hole is used to accommodate and position the eccentric pin boss, and the positioning pin passes through the positioning pin hole and inserts into the positioning pin hole on the base to realize the angular positioning of the adapter block.

[0010] Preferably, the V-shaped clamping block is fixedly connected to the V-shaped fixed block through a clamping bolt.

[0011] Preferably, the base is provided with a T-shaped sliding groove, and the template base is provided with a locking groove corresponding to the T-shaped sliding groove. The locking device includes a locking bolt and a locking nut. The nut of the locking bolt is slidably arranged in the T-shaped sliding groove, and the screw of the locking bolt passes through the T-shaped sliding groove and the locking groove and is threadedly connected to the locking nut.

[0012] Preferably, the top surface of the template base is provided with a sliding groove, and the bottom of the chord template is slidably arranged in the sliding groove.

[0013] Preferably, the base is provided with a guide rail, and the template base is provided with a guide groove that slidably cooperates with the guide rail.

[0014] Preferably, the guide rail is a dovetail guide rail, a rectangular guide rail or an optical axis.

[0015] Preferably, there are two guide rails, and the two guide rails are parallel to each other.

[0016] Preferably, the scale line is arranged on the side surface of the base.

[0017] The utility model has achieved the following technical effects compared with the prior art:

[0018] The welding fixture for positioning the blade section and the angular position of the eccentric pin provided by the present utility model has a structure design of a raised boss, which increases the fitting area between the blade root clamping and positioning component and the end face of the blade root outer sleeve. The raised boss exceeds the blade root center line, adding end face positioning on the basis of the original positioning, which can ensure stable clamping of the parts and eliminates the need for jack adjustment at the blade tip. Without the upper half V-shaped clamping block, the blade can be positioned on the fixture, eliminating the need for multiple operators and increasing safety and installation convenience. The template base can slide freely on the base and drive the chord line template to move accordingly, so that the positioning position of the blade section can be freely changed. Its positioning position can be located through the scale line on the base. After inserting the adapter block into the reference hole of the eccentric pin through the mandrel and inserting the eccentric pin boss into the eccentric pin opening at the same time, the angular positioning of the adapter block is achieved by inserting the positioning pin through the positioning pin opening on the adapter block and into the positioning pin hole on the base, and then the angular positioning of the eccentric pin is realized, improving the positioning accuracy and reliability. The present utility model can meet the clamping requirements of most blade welding, improving the positioning accuracy, reliability and installation convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 It is a part drawing of the blade root after welding the eccentric pin in the present utility model;

[0021] Figure 2 It is an isometric view of the welding fixture for positioning the blade section and the angular position of the eccentric pin provided by the present utility model;

[0022] Figure 3 It is an isometric view of the welding fixture for positioning the blade section and the angular position of the eccentric pin provided by the present utility model after clamping the blade and positioning the eccentric pin;

[0023] Figure 4 It is a front view of the welding fixture for positioning the blade section and the angular position of the eccentric pin provided by the present utility model after clamping the blade and positioning the eccentric pin;

[0024] Figure 5 It is a top view of the welding fixture for positioning the blade section and the angular position of the eccentric pin provided by the present utility model after clamping the blade and positioning the eccentric pin;

[0025] Figure 6 It is an isometric view of the adapter block in the present utility model.

[0026] In the figure: 1 - base, 2 - template base, 3 - chord template, 4 - adapter block, 5 - positioning pin, 6 - V-shaped fixing block, 7 - V-shaped clamping block, 8 - raised boss, 9 - positioning surface, 10 - root jacket, 11 - scale line, 12 - blade body, 13 - positioning pin hole, 14 - eccentric pin hole, 15 - mandrel, 16 - eccentric pin reference hole, 17 - eccentric pin boss, 18 - clamping bolt, 19 - T-shaped sliding groove, 20 - locking bolt, 21 - locking nut, 22 - sliding groove, 23 - guide rail, 24 - indicating scale line, 25 - eccentric pin. Detailed implementation manner

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] The purpose of the present invention is to provide a welding fixture for positioning the blade section and the angular direction of the eccentric pin, so as to solve the problems existing in the prior art, be able to freely change the positioning position of the blade section and the angular direction of the eccentric pin, meet the clamping requirements of most blade welding, and improve the positioning accuracy, reliability and installation convenience.

[0029] To make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0030] As Figures 1-6 shown, this embodiment provides a welding fixture for positioning the blade section and the angular direction of the eccentric pin, including a base 1, a root clamping and positioning assembly, a template base 2, a chord template 3, an adapter block 4 and a positioning pin 5;

[0031] The root clamping and positioning assembly is installed on the base 1 and is used for clamping and positioning the root of the blade. The root clamping and positioning assembly includes a V-shaped fixing block 6 and a V-shaped clamping block 7 that cooperates with the V-shaped fixing block 6. On the end face of the open end of the V-shaped fixing block 6, on the side away from the template base 2, there is a raised boss 8. The side of the V-shaped fixing block 6 and the raised boss 8 facing away from the template base 2 are coplanar to form a positioning surface 9 for axially positioning the root of the blade. After the root jacket 10 is placed in the V-shaped fixing block 6, the end face of the root jacket 10 abuts against the positioning surface 9, and the raised boss 8 is higher than the center line of the root of the blade; on the end face of the open end of the V-shaped clamping block 7, there is a relief notch for making way for the raised boss 8;

[0032] The template base 2 is slidably arranged on the base 1 and positioned by the scale line 11 on the base 1. The template base 2 can be locked on the base 1 through a locking device. The chord template 3 is slidably arranged on the template base 2 along a direction perpendicular to the sliding direction of the template base 2, and the profile of the chord template 3 coincides with the chord line of the blade body 12 section;

[0033] The adapter block 4 is provided with a positioning pin hole 13, an eccentric pin hole 14 and a mandrel 15. The mandrel 15 is used to insert into the eccentric pin reference hole 16, and the eccentric pin hole 14 is used to accommodate and position the eccentric pin boss 17. A plurality of eccentric pin holes 14 are distributed in the circumferential direction of the adapter block 4. The positioning pin 5 passes through the positioning pin hole 13 and inserts into the positioning pin hole on the base 1 to realize the angular positioning of the adapter block 4. Different angular positions of the eccentric pin can be realized by the cooperation of the eccentric pin boss 17 and the eccentric pin holes 14 at different positions.

[0034] In this embodiment, the V-shaped clamping block 7 is fixedly connected with the V-shaped fixing block 6 through a clamping bolt 18, which is convenient and fast to install.

[0035] In this embodiment, the base 1 is provided with a T-shaped sliding groove 19, and the template base 2 is provided with a locking groove corresponding to the T-shaped sliding groove 19. The locking device includes a locking bolt 20 and a locking nut 21. The nut of the locking bolt 20 is slidably arranged in the T-shaped sliding groove 19, and the screw rod of the locking bolt 20 passes through the T-shaped sliding groove 19 and the locking groove and is threadedly connected with the locking nut 21, which is convenient to operate.

[0036] In this embodiment, the top surface of the template base 2 is provided with a sliding groove 22, and the bottom of the chord template 3 is slidably arranged in the sliding groove 22, which is convenient to adjust the position of the chord template 3.

[0037] In this embodiment, the base 1 is provided with a guide rail 23, and the template base 2 is provided with a guide groove slidably matched with the guide rail 23. The guide rail 23 is a dovetail guide rail, and can also be set as a rectangular guide rail or a smooth shaft. There are two guide rails 23, and the two guide rails 23 are parallel to each other.

[0038] In this embodiment, the scale line 11 is arranged on the side surface of the base 1, and the side surface of the template base 2 is provided with an indicating scale line 24 for cooperating with the scale line 11. When adjusting the template base 2, align the indicating scale line 24 with the required scale value.

[0039] During use, first align the indicating scale line 24 of the template base 2 with the corresponding length scale line 11 on the base 1 according to the cross-section position required by the design, tighten the locking nut 21 on the template base 2, and lock the template base 2 on the base 1; open the blade root clamping and positioning assembly, place the structure of the blade root outer sleeve 10 in the V-shaped fixing block 6, press the V-shaped clamping block 7, and make the end face of the blade root outer sleeve 10 abut against the positioning surface 9. Slightly tighten the clamping bolt 18, insert the chord template 3 into the sliding groove 22 in the center of the template base 2, adjust the angle of the blade body 12, and after it fits with the curve of the chord template 3, tighten the clamping bolt 18. At this time, the positioning of the blade in the fixture is completed. Install the positioning stop (a shaft with a 0.02 mm clearance from the inner hole of the blade root outer sleeve 10) on the eccentric pin 25 into the blade root outer sleeve 10, insert the core shaft 15 of the adapter block 4 into the reference hole 16 of the eccentric pin, and position the eccentric pin boss 17 at the eccentric pin opening 14. The positioning pin 5 passes through the positioning pin opening 13 on the adapter block 4 and enters the positioning pin hole on the base 1 to realize the angular positioning of the adapter block 4, that is, the angular positioning of the eccentric pin 25 is realized.

[0040] In the present utility model, specific examples are used to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model; at the same time, for those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A welding fixture for positioning the blade section and the angular direction of the eccentric pin, characterized in that: It includes a base, a blade root clamping and positioning assembly, a sample base, a string sample, a transfer block and a positioning pin; The blade root clamping and positioning assembly is installed on the base and is used for clamping and positioning the blade root. The blade root clamping and positioning assembly includes a V-shaped fixing block and a V-shaped clamping block cooperating with the V-shaped fixing block. The open end face of the V-shaped fixing block is provided with a heightened boss on a side away from the template base. The V-shaped fixing block and a side of the heightened boss facing away from the template base coplanarly constitute a positioning surface for axially positioning the blade root. After the blade root jacket is placed in the V-shaped fixing block, the end face of the blade root jacket abuts against the positioning surface, and the heightened boss is higher than the center line of the blade root. A clearance notch is provided on the open end face of the V-shaped clamping block to make way for the heightened boss. The template base is slidably arranged on the base and positioned by the scale lines on the base. The template base can be locked on the base by a locking device. The chord template is slidably arranged on the template base in a direction perpendicular to the sliding direction of the template base. The chord template profile is consistent with the chord of the blade section. The adapter block is provided with a positioning pin opening, an eccentric pin opening and a core shaft, the core shaft is used to insert into the eccentric pin reference hole, the eccentric pin opening is used to accommodate and position the eccentric pin boss, the positioning pin passes through the positioning pin opening and is inserted into the positioning pin hole on the base to realize angular positioning of the adapter block.

2. The welding fixture for positioning the blade section and the eccentric pin angle according to claim 1, characterized in that: The V-shaped clamping block is fixedly connected to the V-shaped fixing block via a clamping bolt.

3. The welding fixture for positioning the blade section and the eccentric pin angle according to claim 1, characterized in that: The base is provided with a T-shaped groove, and the template base is provided with a locking groove corresponding to the T-shaped groove. The locking device includes a locking bolt and a locking nut. The nut of the locking bolt is slidably set in the T-shaped groove, and the screw of the locking bolt passes through the T-shaped groove and the locking groove and is threadedly connected with the locking nut.

4. The welding fixture for positioning the blade section and the eccentric pin angle according to claim 1, characterized in that: The top surface of the template base is provided with a sliding groove, and the bottom of the string template is slidably arranged in the sliding groove.

5. The welding fixture for positioning the blade section and the eccentric pin angle according to claim 1, characterized in that: The base is provided with a guide rail, and the sample base is provided with a guide groove which is slidably matched with the guide rail.

6. The welding fixture for positioning the blade section and the eccentric pin angle according to claim 5, characterized in that: The guide rail is a dovetail guide rail, a rectangular guide rail or an optical axis.

7. The welding fixture for positioning the blade section and the eccentric pin angle according to claim 5, characterized in that: Two guide rails are provided, and the two guide rails are parallel to each other.

8. The welding fixture for positioning the blade section and the eccentric pin angle according to claim 1, characterized in that: The scale lines are arranged on the side surface of the base.

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