Universal expansion shaft clamp for wind wheel dynamic balance test

Abstract

The utility model relates to the technical field of air conditioner wind wheel testing, in particular to a universal expansion shaft clamp for a wind wheel dynamic balance test, which comprises a clamp shaft, an expansion shaft, an expansion shaft sleeve and an expansion shaft sleeve, the push rod penetrates into the clamp shaft in the axial direction to be movably assembled and connected, and after the push rod penetrates into the clamp shaft, the end, located in the containing cavity, of the push rod is a conical surface with the front portion narrow and the rear portion wide; the expansion block is arranged in the containing cavity and provided with a wedging face in sliding fit with the conical face, and when the expansion block is ejected out of the containing cavity by the push rod, the expansion block and the expansion portion of the clamp shaft are fixed in the inner hole of the workpiece in an expansion mode. According to the universal clamp, the expansion block and the push rod are contained in the clamp shaft, wedging guiding is formed between the expansion block and the push rod, the expansion block is ejected out of the containing cavity of the clamp shaft through the push rod and is matched with the part, extending into the inner hole of the wind wheel workpiece, of the clamp shaft for expansion, and the inner hole of the round workpiece is filled with the expansion block for fixation; or other approximately circular workpiece inner holes can also be suitable for the expansion shaft clamp, and the applicability is high.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioner wind wheel testing, in particular to a universal expansion shaft fixture for wind wheel dynamic balance testing. Background Art

[0002] When testing the dynamic balance performance of the cross-flow impeller of an air conditioner, the impeller needs to be installed on a testing machine. The existing technology is to first fix the workpiece to the fixture with screws. Before the test, the screws need to be manually installed on the workpiece, and the screws need to be aligned with the grooves on the fixture shaft and tightened to prevent the workpiece from shifting or misaligning relative to the fixture. The above method uses a screw fixing part for hard fixation, which can easily cause deviation between the center axis of the impeller workpiece and the axis of the fixture during the dynamic balance test. In addition, this installation method requires manual assistance, which is labor-intensive and does not meet the requirements of automation. On the other hand, the inner hole shape of the impeller workpiece commonly fixed on the current market is mostly circular or approximately circular. Fixing the fixture in the inner hole to meet the dynamic balance test requirements of the impeller has become a problem that needs to be solved urgently in both technology and the market. Utility Model Content

[0003] In order to solve the problems in the above-mentioned background technology, the present application provides a universal expansion shaft fixture for wind wheel dynamic balancing test, which can be firmly assembled in the inner hole of the wind wheel workpiece and adapt to most of the market requirements for the inner hole shape. It has stable installation, low replacement cost and strong applicability.

[0004] To achieve the above objectives, the technical solutions provided by this application are as follows:

[0005] A universal expansion shaft fixture for wind turbine dynamic balancing test, comprising:

[0006] The fixture shaft is a cylindrical through shaft as a whole, hollow in the axial direction, one end of which is radially concave to form a receiving cavity, and the shaft body extending into the inner hole of the wind wheel is the expansion part;

[0007] A push rod, which is axially inserted into the fixture shaft for movable assembly connection, and has a conical surface at one end of the accommodating cavity that is narrow in front and wide in the back after being inserted into the fixture shaft;

[0008] An expansion block is arranged in the accommodating cavity and has a wedging surface that slides with the conical surface. When the expansion block is pushed out of the accommodating cavity by the push rod, it is expanded and fixed with the expansion part of the clamp shaft in the inner hole of the workpiece.

[0009] Compared with the existing technology, the present application adopts a technical solution in which the expansion block set in the push rod is pushed out by the push rod through the wedging cooperation of the two end surfaces in contact, so that the expansion block is tightened and fixed to the fixture shaft part that passes into the inner hole of the workpiece, thereby achieving the technical effect of firmly assembling the fixture and the workpiece and adapting to the use of inner holes of most shapes.

[0010] Preferably, the expansion block is ejected from the workpiece inner hole to form a tightening surface, which has an arc-shaped cross-section and a curvature identical to that of the clamp axis of the tightening portion. Based on this solution, when the expansion block is tightened and fixed in the workpiece inner hole, it has more complete contact with the inner hole surface and a smaller gap between it and the clamp axis, resulting in a better tightening and fixing effect.

[0011] Specifically, a slide rail is integrally formed and fixed along the axial direction on the conical surface, and the wedging surface of the expansion block is concave inward along the axial direction to form a slideway. The slide rail is embedded in the slideway to guide the movable connection, and the expansion block moves along the conical surface along the slide rail. The embedded cooperation between the slide rail and the slideway ensures that the expansion block slides more firmly along the conical surface, and the expansion block is ejected more smoothly and is not easily deflected.

[0012] Furthermore, the slide rail has a T-shaped cross-section, and the slideway is T-shaped to match the shape of the slide rail. After the slide rail and slideway are assembled, a gap is left for the expansion block to be ejected. Using a T-shaped slide rail and slideway allows for a tighter fit between the expansion block and the fixture shaft, more direct transmission of force during ejection. The gap left after assembly reduces resistance caused by hard contact. Accordingly, the T-shaped design is exemplary and can be modified to other similarly shaped rails and slideways that offer similar stability and stability.

[0013] Furthermore, a sleeve is provided on the outer circumference of the fixture shaft. The sleeve comprises a sleeve housing and a bearing, wherein the bearing is disposed between the inner wall of the sleeve housing and the outer circumferential wall of the fixture shaft. The sleeve provided on the exterior of the fixture shaft allows for better adaptation to workstations of varying sizes on testing machines. The sleeve size can be selected based on the size of the workstation, reducing replacement costs. The bearing ensures a more stable engagement between the sleeve housing and the fixture shaft, ensuring that movement of the fixture shaft during testing does not affect the stability of the sleeve housing.

[0014] Furthermore, the other end of the push rod is expanded to form an integrally formed clamping block, and further includes a force guide member, one end of which is provided with a clamping slot for receiving the clamping block for detachable engagement and fixation. One end of the force guide member limits the clamping block at the end of the push rod, and power is transmitted to the clamping block through the force guide member, causing the push rod to reciprocate axially, thereby controlling the ejection and retraction of the expansion block into the receiving chamber.

[0015] Furthermore, the apparatus further includes an electric cylinder, the output shaft of which is fixedly connected to the end of the force guide, and the electric cylinder is connected and controlled by the testing machine system. The testing machine system can control the electric cylinder to provide power to the push rod through the force guide. The model of the electric cylinder can be adjusted and selected according to the requirements of the workpiece to be tested.

[0016] Furthermore, a fixing seat is provided at the end of the electric cylinder and is fixedly connected to the electric cylinder via a connecting shaft. The installation of the fixing seat can better fix the electric cylinder on the test machine, and other similar fixing seats can also be added to the connecting shaft to stabilize the parts.

[0017] Furthermore, the clamp shaft, push rod and expansion block are made of metal alloy materials.

[0018] The beneficial effects of the present invention are as follows: by accommodating the expansion block and the push rod in the fixture shaft, a wedge guide is formed between the expansion block and the push rod, the expansion block is pushed out of the accommodating cavity of the fixture shaft by the push rod, and cooperates with the inner hole part of the fixture shaft extending into the wind wheel workpiece for expansion and tightening. The inner hole of the workpiece that is full of circles can be fixed, or the inner holes of other workpieces that are approximately circular can also be used for the expansion shaft fixture, which has strong applicability; other components such as sleeves, force guides, electrical cylinders and bases can be selected in different specifications or quantities to adapt to different testing machines for stable installation, easy replacement, stable operation and low cost of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is an overall structural diagram of a universal expansion shaft fixture in an embodiment of the present utility model;

[0020] Figure 2 This is an overall axial cross-sectional view of the universal expansion shaft fixture in the embodiment of the utility model;

[0021] Figure 3 This is an exploded view of the expansion block, fixture shaft, sleeve and push rod in the embodiment of the utility model;

[0022] Figure 4 This is an overall structural diagram of the fixture shaft in an embodiment of the present utility model;

[0023] Figure 5 This is an exploded view of the assembly of the expansion block and the push rod in the embodiment of the utility model;

[0024] Figure 6 It is an assembly diagram of the expansion block and the push rod in the embodiment of the utility model.

[0025] In the figure, marks 1-clamp shaft, 101-accommodating cavity, 102-hollow through shaft, 2-expansion block, 201-wedge surface, 202-slideway, 203-expansion surface, 3-push rod, 301-conical surface, 302-slide rail, 303-fastener, 4-sleeve, 401-sleeve shell, 402-bearing, 5-force guide, 501-slot, 502-force-bearing part, 6-electric cylinder, 601-output shaft, 7-fixed seat, 8-connecting shaft, A-expansion part. DETAILED DESCRIPTION

[0026] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the present invention. The components of the present invention generally described and shown in the drawings herein can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative efforts are within the scope of protection of the present invention.

[0027] Example

[0028] In order to solve the technical problems in the background technology, a universal fixture is provided for testing the dynamic balance of the wind turbine, which can be firmly installed in the inner hole of the wind turbine workpiece and has strong applicability. Figure 1-2 The overall structure diagram of the fixture and the cross-sectional view along the axial direction, the utility model provides a universal expansion shaft fixture for wind turbine dynamic balancing test, which at least includes a fixture shaft 1, an expansion block 2 arranged in a receiving cavity 101 at one end of the fixture shaft 1, and a push rod 3 for pushing the expansion block 2 out of the fixture shaft 1 and cooperating with the expansion part A. In addition, it also includes a sleeve 4 fixed on the outer circumference of the fixture shaft 1 by a variable diameter circumference clamp, which is used to facilitate the installation and fixation of the universal fixture on the testing machine, and the sleeves 4 of different sizes can be replaced according to the installation position; wherein the end of the push rod 3 is a block 303 integrally formed by expanding the diameter, and the block 303 forms a limit with the groove 501 formed by the concave front end of the force-guiding member 5, and the block 303 can be detachably removed in the groove 501, and the force-bearing part 502 at the end of the force-guiding member 5 is connected to the output of the electric cylinder 6 through a thread. The shaft 601 is fixedly connected, and the end of the electric cylinder 6 is fixed in the fixing seat 7 at the bottom through the connecting shaft 8; thus, the electric cylinder 6 is controlled by the testing machine system to provide power, and the output shaft 601 pushes or pulls back the force-guiding member 5, and the power is used to drive the push rod 3 to move back and forth along the axial direction through the clamp block 303, and the wedging contact surface formed by the expansion block 2 and the front end of the push rod 3 is used to push out or retract the clamp shaft 1 in the accommodating cavity 101 to complete the fixation of the expansion part A in the inner hole of the circular or approximately circular wind wheel workpiece.

[0029] See also Figure 3-6Regarding the relevant structural diagrams of the expansion block 2, the clamp shaft 1 and the push rod 3, the clamp shaft 1 as a whole is roughly a cylindrical shaft body, and has a hollow through shaft 102 in the axial direction, which is used to accommodate the push rod 3 so that it can move freely in the hollow through shaft 102. The clamp shaft 1 extends into the expansion portion A of the wind wheel inner hole and is concave inward to form an accommodating cavity 101, and the accommodating cavity 101 is connected to the hollow through-shaft 102. The push rod 3 passes through the hollow through-shaft 102 and extends into the accommodating cavity 101. Its longitudinal section presents a conical surface 301 that is narrow in front and wide in the back. A T-shaped slide rail 302 integrally formed with the push rod 3 is axially arranged on the conical surface 301, and the slide rail 302 extends to the end of the conical surface 301; the lump 2 arranged in the accommodating cavity 101 has a wedge surface 201 that is slidably matched with the conical surface 301. The wedging surface 201 is concave inward along the axial direction to form a T-shaped slideway 202 that cooperates with the slide rail 302. The push rod 3 is in the power When pushed downward to move toward the accommodating cavity 101, the T-shaped slide rail 302 slides along the T-shaped slide 202, causing the wedging surface 201 of the expansion block 2 to be relatively displaced along the conical surface 301 of the push rod 3, and the expansion surface 203 on the top of the expansion block 2 is ejected from the accommodating cavity 101, and is expanded and fixed with the expansion part A of the clamp shaft 1 in the inner hole of the workpiece, wherein the longitudinal cross-section of the expansion surface 203 is arc-shaped, and its curvature is the same as that of the clamp shaft 1 of the expansion part A, so that when the expansion block 2 is expanded and fixed in the inner hole of the workpiece, it has more complete contact with the inner hole surface and a smaller gap with the clamp shaft 1, resulting in a better expansion and fixing effect, and according to the amount of the ejected expansion block 2, it can adapt to the inner hole shape of different wind wheel workpieces.

[0030] The use of T-shaped slide rails 302 and slideways 202 can make the embedding between the expansion block 2 and the clamp shaft 1 tighter, and the transmission force during ejection is more direct. The gap left after the two are assembled can reduce the resistance caused by hard contact. Accordingly, the T-shaped shape is exemplary and can also be changed to other special-shaped rails and slideways with similar limiting stability.

[0031] To improve the adaptability and cost-effectiveness of the universal fixture on the testing machine, the outer circumference of the fixture shaft 1 is expanded to form a stepped shaft for easy engagement. A sleeve 4 is provided on the shaft body for engagement. The sleeve 4 includes a sleeve shell 401 and a bearing 402, wherein the bearing 402 is provided between the inner wall of the sleeve shell 401 and the outer circumferential wall of the fixture shaft 1. Sleeving the sleeve 4 on the outside of the fixture shaft 1 can better adapt to the workstations of testing machines of different sizes. The size of the sleeve 4 can be selected according to the size of the workstation, making replacement costs lower. The provision of the bearing 402 can make the engagement between the sleeve shell 401 and the fixture shaft 1 more stable, and the movement of the fixture shaft 1 during testing does not affect the stability of the sleeve shell 401.

[0032] On the other hand, in order to further enhance the stability of the assembly of the entire universal fixture on different testing machines, other parts for fixing the entire universal fixture on the testing machine can be selectively added between the force guide 5 and the electric cylinder 6, and between the electric cylinder 6 and the fixed seat 7. The connection method can be fixed by detachable threads or bolts.

[0033] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved. In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A universal expansion shaft fixture for wind turbine dynamic balance test, characterized by The universal expansion shaft fixture includes: A fixture shaft (1), wherein the fixture shaft (1) is a cylindrical through shaft as a whole, is hollow in the axial direction, and one end thereof is radially concave to form an accommodating cavity (101), and the shaft body extending into the inner hole of the wind wheel workpiece is an expansion portion (A); A push rod (3), the push rod (3) is inserted into the clamp shaft (1) along the axial direction for movable assembly connection, and after the push rod is inserted into the accommodating cavity (101), one end of the push rod (3) forms a tapered surface (301) that is narrow in front and wide in the back; An expansion block (2) is arranged in the accommodating cavity (101) and has a wedging surface (201) that is slidably matched with the conical surface (301). When the expansion block (2) is pushed out of the accommodating cavity (101) by the push rod (3), the expansion block (2) and the expansion portion (A) of the clamp shaft (1) are expanded and fixed in the inner hole of the wind wheel workpiece.

2. The universal expansion shaft fixture according to claim 1, characterized in that The expansion block (2) is pushed out to contact the inner hole of the workpiece, which is the expansion surface (203), and its cross section is arc-shaped, and its curvature is the same as that of the clamp shaft (1) of the expansion part (A).

3. The universal expansion shaft fixture according to claim 1, characterized in that A fixed slide rail (302) is integrally formed along the axial direction on the conical surface (301), and the wedging surface (201) of the expansion block (2) is concave inward along the axial direction to form a slideway (202). The slide rail (302) is embedded in the slideway (202) for movably connection, and the expansion block (2) is displaced on the conical surface (301) along the slide rail (302).

4. The universal expansion shaft fixture according to claim 3, characterized in that The cross section of the slide rail (302) is T-shaped, and the slideway (202) is T-shaped to match the shape of the slide rail (302). A gap is left between the slide rail (302) and the slideway (202) after assembly.

5. The universal expansion shaft fixture according to claim 1, characterized in that A shaft sleeve (4) is provided on the outer circumference of the clamp shaft (1), and the shaft sleeve (4) comprises a shaft sleeve shell (401) and a bearing (402), wherein the bearing (402) is arranged between the inner wall of the shaft sleeve shell (401) and the outer circumferential wall of the clamp shaft (1).

6. The universal expansion shaft fixture according to claim 1, characterized in that The other end of the push rod (3) is expanded to form an integrally formed clamping block (303), and further comprises a force guide member (5). One end of the force guide member (5) is provided with a clamping groove (501) for accommodating the clamping block (303) for detachable clamping and fixing.

7. The universal expansion shaft fixture according to claim 6, characterized in that It also includes an electric cylinder (6), the output shaft (601) of the electric cylinder (6) is fixedly connected to the end of the force guide (5), and the electric cylinder (6) is connected and controlled by the system of the testing machine.

8. The universal expansion shaft fixture according to claim 7, characterized in that It also includes a fixing seat (7), which is arranged at the end of the electric cylinder (6), and a connecting shaft (8) is arranged between the two for fixed connection.

9. The universal expansion shaft fixture according to claim 1, characterized in that The clamp shaft (1), push rod (3) and expansion block (2) are made of metal alloy material.

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