Stress detection equipment for wind power inside hexagonal bolt

Abstract

The utility model belongs to the technical field of wind power bolt stress detection, particularly relates to a wind power inner hexagonal bolt stress detection device, and aims to solve the problems that the stress at the joint of a screw and a bolt head cannot be detected and the adjusting capacity of a test part is insufficient in the background technology. An air cylinder is fixedly connected to the outer wall of the top of the machine table through screws, an L-shaped plate is fixedly connected to a piston rod of the air cylinder, and a rack is welded to the outer wall of one side of the L-shaped plate. According to the utility model, through the design of the screw positioning port and the bolt head positioning groove on the double-end fixing seat, the bolt head and the screw of the wind power inside hexagonal bolt can be rapidly tested respectively, the fatigue crack risk can be effectively identified, and through the linkage design of the movable seat and the screw rod, the movable block can slide along the inner wall of the lifting plate, and the fatigue crack risk can be effectively identified. Therefore, the clamping area of the screw is changed, the root or the middle of the thread of the screw is aligned with the tension loading point, different test requirements are met, and the coverage rate and the accuracy of factory detection are improved.

Description

Technical Field

[0001] This utility model relates to the field of wind turbine bolt stress testing technology, and in particular to a stress testing device for wind turbine internal hexagonal bolts. Background Technology

[0002] Wind turbine socket head cap bolts are high-strength fasteners specifically designed for wind power generation equipment. Their structure includes a threaded rod and a one-piece hexagonal bolt head. Because wind turbines are subjected to complex alternating loads (such as wind loads and vibrations) over long periods, the stress distribution of the bolts directly affects the stability and safety of the equipment. These bolts are typically made of high-strength alloy steel and must meet stringent requirements for tensile, shear, and fatigue performance. In wind power equipment, socket head cap bolts are widely used in critical components such as tower connections, blade mounting, and gearbox assembly. Accurate detection of their stress state is crucial for preventing bolt breakage and extending equipment lifespan.

[0003] Currently, the stress testing technology for wind turbine internal hexagonal bolts before they leave the factory has the following shortcomings:

[0004] Unable to detect stress at the connection between the screw and the bolt head: Existing testing equipment mostly uses uniaxial tensile or torque testing, which can only obtain stress data for the screw part. Fatigue cracks at the connection between the bolt head and the screw (stress concentration area) are difficult to detect, affecting the reliability of the products leaving the factory.

[0005] Insufficient adjustability of test areas: The clamping position of the bolts is fixed, making it impossible to adjust the test areas according to actual needs. For example, if it is necessary to test the stress distribution in different sections of the bolt (such as the root of the thread or the middle of the bolt), the clamps must be replaced or the bolts must be reinstalled, which is cumbersome and inefficient, making it difficult to meet the high-efficiency requirements of batch testing before leaving the factory. Utility Model Content

[0006] To address the shortcomings of existing technologies, this utility model provides a stress testing device for hexagonal bolts in wind power systems. This device overcomes the deficiencies of existing technologies and effectively solves the problems of not being able to detect the stress at the connection between the bolt and the bolt head, as well as the insufficient adjustment capability of the testing area.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A stress testing device for hexagonal bolts in wind turbines includes a machine base. A cylinder is fixedly connected to the top outer wall of the machine base by screws, and an L-shaped plate is fixedly connected to the piston rod of the cylinder. A rack is welded to one side outer wall of the L-shaped plate, and a gear meshes on the outer wall of the rack. A rotating shaft is installed through the center of the inner wall of the gear, and a double-headed fixing seat is fixedly connected to the top outer wall of the rotating shaft.

[0009] A movable seat is provided on one side of the double-headed fixed seat, and a movable block is welded to the top outer wall of the movable seat. A lifting plate is slidably connected to the outer wall of the movable block, and a screw is screwed to the inner wall of the movable block. One end of the screw is rotatably connected to the top outer wall of the lifting plate. A U-shaped plate is welded to the top outer wall of the lifting plate, and a hydraulic cylinder is installed on the top outer wall of the U-shaped plate.

[0010] Preferably, a tension sensor is installed at the connection between the U-shaped plate and the hydraulic cylinder.

[0011] Preferably, a wind turbine hexagonal bolt is placed between the double-headed fixed seat and the movable seat, and a nut is screwed onto the outer wall of the wind turbine hexagonal bolt, with the nut tightly attached to the outer wall of the movable seat.

[0012] Preferably, the wind turbine hexagonal bolt includes a screw and a bolt head disposed on the outer wall of one end of the screw, wherein the screw is placed on the inner wall of the double-ended fixed seat and the movable seat.

[0013] Preferably, the outer wall of one side of the double-headed fixing seat is provided with a screw positioning port, and the outer wall of the other side of the double-headed fixing seat is provided with a bolt head positioning groove. The screw is inserted through the inner wall of the screw positioning port, and the bolt head is matched with the size of the bolt head positioning groove.

[0014] Preferably, a connecting plate is fixedly connected to the outer wall of the hydraulic cylinder, and an electrical control cabinet is fixedly connected to one side of the outer wall of the connecting plate by screws. The electrical control cabinet is installed on the top outer wall of the machine tool, and the hydraulic cylinder is connected to the air cylinder, the hydraulic cylinder and the tension sensor by signal lines.

[0015] Preferably, the rotating shaft is rotatably connected to the top outer wall of the machine tool via a bearing, and a limit ring is welded to the bottom outer wall of the rotating shaft, with the limit ring tightly attached to the top inner wall of the machine tool.

[0016] The beneficial effects of this utility model are as follows:

[0017] 1. This design of a stress testing device for wind turbine hexagonal socket head cap screws utilizes the screw positioning port and bolt head positioning groove on the double-headed fixed base to quickly test the bolt head and screw of the wind turbine hexagonal socket head cap screws separately. During pre-shipment testing, after the screw portion is tested, the rotating shaft drives the double-headed fixed base to rotate, allowing the bolt head positioning groove to switch to the testing position. Combined with the synergistic effect of the tension sensor and hydraulic cylinder, precise loads can be applied to the connection between the bolt head and screw, and the stress distribution in this area can be monitored in real time. This effectively identifies the risk of fatigue cracks and ensures the reliability of the product quality.

[0018] 2. This design for a stress testing device for wind turbine hexagonal bolts features a linkage design between the movable seat and the lead screw, allowing the movable block to slide along the inner wall of the lifting plate. By rotating the lead screw, the horizontal position of the movable seat can be freely adjusted, thereby changing the clamping area of ​​the screw. For example, during factory testing, the root or middle of the screw thread can be aligned with the tensile loading point to meet different testing requirements and improve the coverage and accuracy of factory testing. Attached Figure Description

[0019] Figure 1 This utility model presents a three-dimensional schematic diagram of the overall structure of a stress testing device for wind turbine internal hexagonal bolts. Figure 1 ;

[0020] Figure 2 This utility model presents a three-dimensional schematic diagram of the overall structure of a stress testing device for wind turbine internal hexagonal bolts. Figure 2 ;

[0021] Figure 3 This utility model provides a structural schematic diagram of a wind turbine internal hexagonal bolt stress testing device. Figure 1 ;

[0022] Figure 4 This utility model provides a structural schematic diagram of a wind turbine internal hexagonal bolt stress testing device. Figure 2 ;

[0023] Figure 5 This utility model presents a schematic diagram of a double-headed fixed base, a movable base, and a disassembled structure of a wind turbine hexagonal bolt stress testing device.

[0024] In the diagram: 1. Machine base; 2. Cylinder; 3. L-shaped plate; 4. Rack; 5. Gear; 6. Rotating shaft; 7. Double-headed fixed seat; 8. Movable seat; 9. Movable block; 10. Lifting plate; 11. Lead screw; 12. U-shaped plate; 13. Hydraulic cylinder; 14. Wind turbine hexagon socket head cap screw; 141. Screw; 142. Bolt head; 15. Limiting ring; 16. Screw positioning port; 17. Bolt head positioning groove; 18. Connecting plate; 19. Electrical control cabinet. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0026] Reference Figures 1-5Example 1: A stress testing device for hexagonal bolts in wind power equipment includes a machine base 1. A cylinder 2 is fixedly connected to the top outer wall of the machine base 1 by screws. An L-shaped plate 3 is fixedly connected to the piston rod of the cylinder 2. A rack 4 is welded to one side outer wall of the L-shaped plate 3. A gear 5 meshes on the outer wall of the rack 4. A rotating shaft 6 is installed through the center of the inner wall of the gear 5. A double-headed fixing seat 7 is fixedly connected to the top outer wall of the rotating shaft 6. The rotating shaft 6 is rotatably connected to the top outer wall of the machine base 1 through a bearing. A limit ring 15 is welded to the bottom outer wall of the rotating shaft 6. The limit ring 15 is tightly attached to the top inner wall of the machine base 1.

[0027] The machine base 1 serves as the equipment base. The top of the machine base is fixed with a cylinder 2 by screws. The piston rod of the cylinder 2 is connected to an L-shaped plate 3. The L-shaped plate 3 is welded with a rack 4, which meshes with a gear 5 to drive the rotating shaft 6 to rotate. The rotating shaft 6 is fixed to the machine base 1 by bearings. The top of the rotating shaft 6 is fixed with a double-headed fixing seat 7. One side of the double-headed fixing seat 7 is provided with a screw positioning port 16 for fixing the screw 141. The other side of the double-headed fixing seat 7 is provided with a bolt head positioning groove 17, the size of which matches the bolt head 142. The limiting ring 15 at the bottom of the rotating shaft 6 can prevent the rotating shaft 6 from detaching from the machine base 1.

[0028] In embodiment 2, a movable seat 8 is provided on one side of the double-headed fixed seat 7, and a movable block 9 is welded to the top outer wall of the movable seat 8. A lifting plate 10 is slidably connected to the outer wall of the movable block 9, and a screw rod 11 is screwed to the inner wall of the movable block 9. One end of the screw rod 11 is rotatably connected to the top outer wall of the lifting plate 10. A U-shaped plate 12 is welded to the top outer wall of the lifting plate 10, and a hydraulic cylinder 13 is installed on the top outer wall of the U-shaped plate 12. A tension sensor is installed at the connection between the U-shaped plate 12 and the hydraulic cylinder 13.

[0029] Movable seat 8 is welded to movable block 9, which is slidably connected to lifting plate 10. A screw rod 11 is threaded inside movable block 9, with one end of screw rod 11 rotatably connected to the top of lifting plate 10. When screw rod 11 is rotated, movable seat 8 can move horizontally, thereby adjusting the clamping position of screw rod 141. A hydraulic cylinder 13 is mounted on the top of U-shaped plate 12, and a tension sensor is integrated at the connection between hydraulic cylinder 13 and U-shaped plate 12 for real-time load data acquisition.

[0030] A wind turbine hexagon socket head cap 14 is placed between the double-ended fixed seat 7 and the movable seat 8, and a nut is screwed onto the outer wall of the wind turbine hexagon socket head cap 14. The nut is tightly attached to the outer wall of the movable seat 8. The wind turbine hexagon socket head cap 14 includes a screw 141 and a bolt head 142 set on the outer wall of one end of the screw 141. The screw 141 is placed on the inner wall of the double-ended fixed seat 7 and the movable seat 8.

[0031] The double-headed fixing base 7 has a screw positioning port 16 on one side of its outer wall and a bolt head positioning groove 17 on the other side of its outer wall. The screw 141 is inserted through the inner wall of the screw positioning port 16 and the bolt head 142 is matched with the size of the bolt head positioning groove 17.

[0032] A connecting plate 18 is fixedly connected to the outer wall of the hydraulic cylinder 13, and an electrical control cabinet 19 is fixedly connected to one side of the outer wall of the connecting plate 18 by screws. The electrical control cabinet 19 is installed on the top outer wall of the machine base 1, and the hydraulic cylinder 13 is connected to the air cylinder 2, and the hydraulic cylinder 13 and the tension sensor are all connected by signal lines.

[0033] The electrical control cabinet 19 is fixed to the machine base 1 via the connecting plate 18. The electrical control cabinet 19 can integrate a PLC controller and a data acquisition module. The hydraulic cylinder 13, the air cylinder 2, and the tension sensor are connected to the electrical control cabinet 19 via signal lines to realize the automation of load application, rotation control, and data feedback.

[0034] Working principle: The stress testing process for wind turbine internal hexagonal bolts before leaving the factory is as follows:

[0035] Installation and positioning of wind turbine hexagon socket head cap screws 14: Not only can the screw 141 of the wind turbine hexagon socket head cap screw 14 be inserted into the screw positioning port 16 of the double-ended fixing seat 7, but the bolt head 142 can also be embedded in the bolt head positioning groove 17. The movable seat 8 is adjusted to be aligned with the double-ended fixing seat 7 by the screw 11 to ensure that the wind turbine hexagon socket head cap screw 14 is fixed horizontally and meets the clamping efficiency requirements of the factory inspection.

[0036] Screw 141 stress test: Start cylinder 2, push L-shaped plate 3 to drive rack 4 to move horizontally, gear 5 will drive rotating shaft 6 to rotate, switch screw positioning port 16 and bolt head positioning groove 17 on double-headed fixed seat 7 to the test position. When screw positioning port 16 is in the test position, hydraulic cylinder 13 applies axial tension to screw 141 until it breaks. Tension sensor records stress data in real time to ensure that the mechanical properties of the bolts meet the standards.

[0037] Bolt head 142 connection inspection: After the screw 141 test is completed, cylinder 2 resets, and rotating shaft 6 rotates 180 degrees to switch bolt head 142 to the test position. Hydraulic cylinder 13 applies load again to check the stress distribution at the connection between bolt head 142 and screw 141, ensuring that there are no potential defects before leaving the factory.

[0038] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A stress testing device for wind turbine internal hexagonal bolts, comprising a machine base (1), characterized in that, The machine base (1) has a cylinder (2) fixedly connected to the top outer wall by screws, and the piston rod of the cylinder (2) is fixedly connected to an L-shaped plate (3). A rack (4) is welded to one side outer wall of the L-shaped plate (3), and a gear (5) meshes on the outer wall of the rack (4). A rotating shaft (6) is installed through the center of the inner wall of the gear (5), and a double-headed fixing seat (7) is fixedly connected to the top outer wall of the rotating shaft (6). A movable seat (8) is provided on one side of the double-headed fixed seat (7), and a movable block (9) is welded to the top outer wall of the movable seat (8). A lifting plate (10) is slidably connected to the outer wall of the movable block (9), and a screw rod (11) is screwed to the inner wall of the movable block (9). One end of the screw rod (11) is rotatably connected to the top outer wall of the lifting plate (10). A U-shaped plate (12) is welded to the top outer wall of the lifting plate (10), and a hydraulic cylinder (13) is installed on the top outer wall of the U-shaped plate (12).

2. The stress testing equipment for wind turbine internal hexagonal bolts according to claim 1, characterized in that, A tension sensor is installed at the connection between the U-shaped plate (12) and the hydraulic cylinder (13).

3. The stress testing equipment for wind turbine internal hexagonal bolts according to claim 1, characterized in that, A wind turbine hexagonal bolt (14) is placed between the double-headed fixed seat (7) and the movable seat (8), and a nut is screwed onto the outer wall of the wind turbine hexagonal bolt (14), with the nut tightly attached to the outer wall of the movable seat (8).

4. The stress testing equipment for wind turbine internal hexagonal bolts according to claim 3, characterized in that, The wind turbine hexagonal bolt (14) includes a screw (141) and a bolt head (142) disposed on the outer wall of one end of the screw (141), wherein the screw (141) is placed on the inner wall of the double-headed fixed seat (7) and the movable seat (8).

5. The stress testing equipment for wind turbine internal hexagonal bolts according to claim 1, characterized in that, The double-headed fixing seat (7) has a screw positioning port (16) on one side of its outer wall and a bolt head positioning groove (17) on the other side of its outer wall. The screw (141) is inserted through the inner wall of the screw positioning port (16) and the bolt head (142) is matched with the size of the bolt head positioning groove (17).

6. The stress testing equipment for wind turbine internal hexagonal bolts according to claim 1, characterized in that, A connecting plate (18) is fixedly connected to the outer wall of the hydraulic cylinder (13), and an electrical control cabinet (19) is fixedly connected to one side of the outer wall of the connecting plate (18) by screws. The electrical control cabinet (19) is installed on the top outer wall of the machine base (1), and the hydraulic cylinder (13) is connected to the air cylinder (2), the hydraulic cylinder (13) and the tension sensor by signal lines.

7. The stress testing equipment for wind turbine internal hexagonal bolts according to claim 1, characterized in that, The rotating shaft (6) is rotatably connected to the top outer wall of the machine base (1) via a bearing, and a limiting ring (15) is welded to the bottom outer wall of the rotating shaft (6), with the limiting ring (15) tightly attached to the top inner wall of the machine base (1).

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