Friction coefficient measuring device for wind power yaw brake

Abstract

The utility model discloses a friction coefficient measuring device for a wind power yaw brake. The friction coefficient measuring device comprises a test bed tool, a friction plate tool, a driving tool and a pressure tool, the driving tool is installed at the top of the test bed tool, an actuating rod of the driving tool is vertically downward and is detachably connected with the friction plate tool, and the pressure tool is integrally vertically upward and is detachably connected with the bottom of the test bed tool. A U-shaped pressure applying position for applying pressure to the friction plate tool is formed in the pressure tool, and the friction plate tool can extend into the U-shaped pressure applying position; the device can simulate and measure the friction coefficient between the yaw brake of the wind turbine generator and the contact surface of the gear ring under different positive pressure conditions, so as to solve the problem that the friction coefficient is difficult to accurately estimate due to the change of working conditions in the prior art.

Description

Technical Field

[0001] The utility model relates to the technical field of measuring the friction coefficient of a yaw brake of a wind turbine, in particular to a device for measuring the friction coefficient of a wind power yaw brake. Background Art

[0002] The yaw brake plays a crucial role in a wind power generation unit. After the wind turbine is aligned with the wind, the yaw brake will apply sufficient braking torque to bite the gear ring, lock the position of the nacelle, and ensure that the wind turbine rotor will not deviate from the optimal windward angle due to factors such as wind force. In order to design and select a suitable yaw brake, engineers need to perform simulation calculations, and the friction coefficient is one of the key input parameters.

[0003] Theoretically, under ideal conditions, the frictional force between the yaw brake and the surface of the gear ring follows Amonton's law, that is, the product of the frictional force f and the normal pressure N is equal to the product of the friction coefficient μ and the normal pressure N, expressed as f = μN. The magnitude of the friction coefficient μ is closely related to conditions such as the material properties of the contact surface and the surface roughness. Although it does not directly change with the normal pressure theoretically, in actual engineering applications, the normal pressure borne by the wind turbine under different operating conditions varies greatly, which may cause different degrees of deformation of the interacting brake and gear ring, and thus lead to changes in the contact state and friction characteristics between the two.

[0004] Therefore, it is particularly important to design a device that can measure the true friction coefficient between the yaw brake and the gear ring under various working conditions, which helps to more accurately simulate and predict the performance and safety of wind turbines in complex environments. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a device for measuring the friction coefficient of a wind power yaw brake to solve the deficiencies in the prior art. The device can simulate and measure the friction coefficient between the yaw brake of the wind turbine and the contact surface of the gear ring under different normal pressure conditions, so as to solve the problem that it is difficult to accurately estimate the friction coefficient due to the change of working conditions in the prior art.

[0006] To achieve the above object, the technical solution provided by the present utility model is: a friction coefficient measuring device for a wind power yaw brake, including a test bench tooling, a friction plate tooling, a driving tooling, and a pressure tooling; the driving tooling is installed on the top of the test bench tooling, the actuating rod of the driving tooling is vertically downward and forms a detachable connection with the friction plate tooling, and the pressure tooling is vertically upward as a whole and forms a detachable connection with the bottom of the test bench tooling; wherein, the pressure tooling includes a pressing member, a bearing member, and an intermediate fixing member, concave portions are provided at the bottom ends of the pressing member and the bearing member, convex portions are provided on both sides of the top end of the intermediate fixing member, and the convex portions of the intermediate fixing member form an interference fit with the concave portions of the pressing member and the bearing member. A first friction member is telescopically installed on one side surface of the pressing member, and a second friction member is fixedly installed on the side surface of the bearing member facing the first friction member, so that the first friction member, the second friction member, and the top surface of the intermediate fixing member form a U-shaped pressing position for pressing the friction plate tooling, and the friction plate tooling can extend into the U-shaped pressing position and contact the first friction member and the second friction member respectively.

[0007] Further, the driving tooling includes an actuating rod and a driving assembly, the driving assembly is connected to the actuating rod and is used to drive the actuating rod to perform vertical telescopic movement, the driving assembly is also connected to an industrial control computer for controlling the movement mode of the actuating rod, the free end of the actuating rod is connected with an upper chuck for forming a detachable connection with the friction plate tooling, and a force sensor and a displacement sensor are also installed in the driving tooling for monitoring the driving condition.

[0008] Further, the friction plate tooling includes an upper rod and a metal friction plate, one end of the upper rod is connected to the metal friction plate, and the other end of the upper rod forms a detachable connection with the actuating rod of the driving tooling through the upper chuck.

[0009] Further, the test bench tooling includes a base, columns, and an upper cross beam; the base and the upper cross beam are connected by multiple columns, a lower chuck is provided on the top of the base, and the lower chuck forms a detachable connection with the bottom end of the intermediate fixing member.

[0010] Further, the pressing member is provided with an adjusting bolt, a rotation stopping member, a guiding column, and a disc spring. An installation position for installing the first friction member is provided on one side surface of the pressing member, the first friction member is arranged in the installation position, the stud end of the adjusting bolt sequentially passes through the rotation stopping member, the other side surface of the pressing member, and the guiding column and then is connected to the first friction member, and the disc spring is arranged between the first friction member and the inner wall of the installation position.

[0011] Further, an installation position for installing a second friction member is provided on one side surface of the pressure-bearing member. The second friction member is arranged in this installation position and is connected with a pressure sensor, and the pressure sensor is equipped with a display for monitoring the pressure application situation of the pressure tooling.

[0012] Further, both the first friction member and the second friction member are cylindrical friction members.

[0013] Further, a high-strength bolt is also installed through the boss part of the intermediate fixing member and the concave parts of the pressure-applying member and the pressure-bearing member to prevent relative rotation among the three.

[0014] Compared with the prior art, the present utility model has the following advantages and beneficial effects:

[0015] 1. Good stability. In the present utility model, an uneven stepped shear-resistant structure is formed by the boss part of the intermediate fixing member and the concave parts of the pressure-applying member and the pressure-bearing member, ensuring that there is no relative movement among the toolings, thereby realizing stability, ensuring that only the relative friction movement of the yaw brake occurs in the overall device, and connecting and fastening the toolings with high-strength bolts to prevent relative rotation.

[0016] 2. Good adjustability. The present utility model can freely adjust the applied pressure magnitude according to the test requirements by adjusting the tightness of the bolts. The manual adjustment of the pressure is convenient, reducing the cost of the oil pressure device, and the pressure is collected in real time through the pressure sensor and displayed through the supporting sensor display, and then the applied pressure is increased or decreased by adjusting the bolts according to the sensor data.

[0017] 3. Good usability. The present utility model is small in size, light in weight, convenient to install and disassemble, and easy to apply positive pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of the present utility model.

[0019] Figure 2 is a structural sectional view of the pressure-applying member.

[0020] Figure 3 is a structural sectional view of the pressure-bearing member.

[0021] Figure 4 is a schematic connection structural diagram of the pressure-applying member, the pressure-bearing member and the intermediate fixing member. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The present utility model will be further described below in conjunction with specific embodiments.

[0023] See Figures 1 to 4As shown in the figure, the friction coefficient measuring device for a wind power yaw brake provided in this embodiment includes a test bench tooling 1, a driving tooling, a friction plate tooling, and a pressure tooling;

[0024] The test bench tooling 1 includes an upper cross beam 101, a base 102, and columns 103. The upper cross beam 101 is located above the base 102, and a preset distance is maintained between the upper cross beam 101 and the base 102 and they are connected by the columns 103;

[0025] The driving tooling is installed at the upper cross beam 101. The driving tooling includes an actuating rod 3 and a driving assembly 2. The driving assembly 2 is connected to the actuating rod 3 and is used to drive the actuating rod 3 to perform vertical telescopic movement. The driving assembly 2 is also connected to an industrial control computer 11, which is used to control the movement mode of the actuating rod 3. The free end of the actuating rod 3 is vertically downward and is connected to an upper chuck 4, which is used to form a detachable connection with the friction plate tooling. A force sensor and a displacement sensor are also installed in the driving tooling to monitor the driving condition;

[0026] The friction plate tooling includes an upper rod 5 and a metal friction plate 6. One end of the upper rod 5 is connected to the metal friction plate 6, and the other end of the upper rod 5 is detachably connected to the actuating rod 3 of the driving tooling through the upper chuck 4. The metal friction plate 6 is of the same thickness as the yaw gear ring of the actual wind turbine and is made of the same metal material, and is used to simulate the yaw gear ring of the actual wind turbine;

[0027] The overall pressure tooling is vertically upward and is detachably connected to the base 102; the pressure tooling includes a pressing member 7, a bearing member 8 and an intermediate fixing member 9. Concave portions 12 are provided at the bottom ends of both the pressing member 7 and the bearing member 8, and convex portions 13 are provided on both sides of the top end of the intermediate fixing member 9. The convex portions 13 of the intermediate fixing member are in interference fit with the concave portions 12 of the pressing member and the bearing member, forming a concave-convex stepped shear-resistant structure 91. A high-strength bolt 14 is installed through the three members, and a pre-tightening force is applied to the high-strength bolt 14 to prevent relative rotation; a first friction member 75 is telescopically installed on one side surface of the pressing member 7, and a second friction member 81 is fixedly installed on the side surface of the bearing member 8 facing the first friction member 75. The first friction member 75, the second friction member 81 and the top surface of the intermediate fixing member 9 form a U-shaped pressing position for pressing the friction plate tooling. The metal friction plate 6 of the friction plate tooling can extend into the U-shaped pressing position and contact the first friction member 75 and the second friction member 81 respectively; among them, an adjusting bolt 71, a rotation-preventing member 72, a guide post 73 and a disc spring 74 are provided in the pressing member. An installation position for installing the first friction member 75 is provided on one side surface of the pressing member 7, and the first friction member 75 is arranged in the installation position. The stud end of the adjusting bolt 71 sequentially passes through the rotation-preventing member 72, the other side surface of the pressing member 7 and the guide post 73 and then is connected to the first friction member 75. The disc spring 74 is arranged between the first friction member 75 and the inner wall of the installation position; an installation position for installing the second friction member 81 is provided on one side surface of the bearing member 8, and the second friction member 81 is arranged in the installation position and is connected with a pressure sensor 82. The pressure sensor 82 is equipped with a display 15 for monitoring the pressing condition of the pressure tooling.

[0028] In the use of this embodiment, first clamp the friction plate tooling to the upper chuck 4 and adjust its perpendicularity. Then clamp the pressure tooling to the lower chuck 10 to vertically fix the pressure tooling, ensuring that the friction plate tooling and the pressure tooling are on the same vertical axis during the test. Adjust the nut end of the adjusting bolt of the pressure-applying member 7 to apply pressure to the metal friction plate 6, and determine the adjustment amount according to the target pressure and the pressure sensor reading table built in the load-bearing member 8. Control the driving tooling through the industrial control computer 11, adopt a control mode of constant motion output, so that the driving assembly 2 drives the actuating rod 3, drives the metal friction plate 6 to move through the upper chuck 4 and the upper rod 5, and record the data of the change of the pulling force of the actuating rod 3 with displacement through the force sensor and displacement sensor built in the driving device. At the moment when relative motion just occurs, record the pulling force data Fs, then the static friction coefficient μs of the contact surface between the first friction member 75 and the second friction member 81 of the simulated yaw brake and the metal friction plate 6 = Fs / 2 / N; during the process of stable relative motion, record the pulling force data Fk in the stable state, then the dynamic friction coefficient μk of the contact surface between the first friction member 75 and the second friction member 81 of the simulated yaw brake and the metal friction plate 6 = Fk / 2 / N.

[0029] In the present utility model, by adjusting the adjusting bolt 71 of the pressure-applying member 7, the disc spring 74 generates compressive deformation, so that a normal pressure is generated between the first friction member 75 and the metal friction plate 6, and the magnitude N of the normal pressure can be measured by the pressure sensor 82 built in the load-bearing member. The adjustment amount of the adjusting bolt 71 can be freely adjusted according to the required pressure magnitude. After the adjusting bolt 71 is adjusted in place, it is locked by installing the anti-rotation member 72 to prevent the adjusting bolt 71 from loosening during the measurement of the friction coefficient. Adopt a stable displacement speed control method, apply a pulling force to the upper rod 5 through the driving assembly 2 and the actuating rod 3, and drive the metal friction plate 6 to slide relative to the first friction member 75 and the second friction member 81, so as to simulate the braking process of the yaw brake, and at the same time record the data of the change of the pulling force of the actuating rod 3 with displacement for friction coefficient analysis.

[0030] The above-described embodiments are only the preferred embodiments of the present utility model, and do not limit the scope of implementation of the present utility model. Therefore, all changes made according to the shape and principle of the present utility model should be covered within the protection scope of the present utility model.

Claims

1. A wind turbine yaw brake friction coefficient measuring device, characterized in that: The invention comprises a test bench tooling, a friction plate tooling, a driving tooling and a pressure tooling; the driving tooling is installed on the top of the test bench tooling, the actuating rod of the driving tooling is vertically downward and forms a detachable connection with the friction plate tooling, and the pressure tooling is vertically upward as a whole and forms a detachable connection with the bottom of the test bench tooling; wherein the pressure tooling comprises a pressure-applying member, a pressure-bearing member and an intermediate fixing member, the bottom ends of the pressure-applying member and the pressure-bearing member are both provided with a concave platform portion, the top ends of the intermediate fixing member are both provided with a convex platform portion, the convex platform portion of the intermediate fixing member forms an interference fit with the concave platform portion of the pressure-applying member and the pressure-bearing member, a first friction member is telescopically installed at one side of the pressure-applying member, and a second friction member is fixedly installed at the side of the pressure-bearing member facing the first friction member, so that the top surfaces of the first friction member, the second friction member and the intermediate fixing member form a U-shaped pressure position for applying pressure to the friction plate tooling, and the friction plate tooling can extend into the U-shaped pressure position and contact the first friction member and the second friction member respectively.

2. The device for measuring friction coefficient of wind turbine yaw brake according to claim 1, characterized in that: The driving tooling includes an actuating rod and a driving assembly. The driving assembly is connected to the actuating rod and is used to drive the actuating rod to perform upward and downward telescopic movements. The driving assembly is also connected to an industrial computer for controlling the movement mode of the actuating rod. The free end of the actuating rod is connected to an upper chuck for forming a detachable connection with the friction plate tooling. A force sensor and a displacement sensor are also installed in the driving tooling for monitoring the driving condition.

3. The device for measuring friction coefficient of wind turbine yaw brake according to claim 2, characterized in that: The friction plate tooling comprises an upper rod and a metal friction plate, one end of the upper rod is connected to the metal friction plate, and the other end of the upper rod is detachably connected to an actuating rod of the driving tooling through an upper clamp.

4. The device for measuring friction coefficient of wind turbine yaw brake according to claim 1, characterized in that: The test bench tooling includes a base, columns and an upper crossbeam; the base and the upper crossbeam are connected by a plurality of columns, a lower clamp is provided on the top of the base, and the lower clamp is detachably connected to the bottom end of the intermediate fixing piece.

5. The device for measuring friction coefficient of wind turbine yaw brake according to claim 1, characterized in that: The pressure member is provided with an adjusting bolt, a stop member, a guide column and a disc spring. A mounting position for mounting a first friction member is provided on one side of the pressure member. The first friction member is arranged in the mounting position. The stud end of the adjusting bolt passes through the stop member, the other side of the pressure member and the guide column in sequence and is connected to the first friction member. The disc spring is arranged between the first friction member and the inner wall of the mounting position.

6. The device for measuring friction coefficient of wind turbine yaw brake according to claim 1, characterized in that: A mounting position for mounting a second friction member is provided on one side of the pressure-bearing member. The second friction member is arranged in the mounting position and is connected to a pressure sensor. The pressure sensor is equipped with an indicator for monitoring the pressure of the pressure tooling.

7. The device for measuring friction coefficient of wind turbine yaw brake according to claim 1, characterized in that: The first friction member and the second friction member are both cylindrical friction members.

8. The device for measuring friction coefficient of wind turbine yaw brake according to claim 1, characterized in that: A high-strength bolt is also installed between the boss portion of the intermediate fixing member and the concave portions of the pressure-applying member and the pressure-bearing member to prevent the three from rotating relative to each other.

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