Friction loss testing device of high-altitude wind power ground transmission system

Abstract

The invention relates to the technical field of high-altitude wind power, in particular to a frictional loss testing device of a high-altitude wind power ground transmission system. When the equivalent friction coefficient is tested, the clutch is in a connected state, the second cable is in an unconnected state, the power source can drive a winding drum of the first testing assembly to rotate and a first pulley to keep idling, and therefore the equivalent friction coefficient can be tested through the wrap angle of the first cable and the tension, measured by a first tension sensor, of the first cable. Calculating an equivalent friction coefficient; when the transmission loss efficiency is tested, the clutch is in an unconnected state, the second cable is in a connected state, the brake works, the power source can drive the first pulley to rotate, and the second pulley is driven to rotate through the second cable. Therefore, the rotating speed and the torque of the first pulley can be measured through the first torque rotating speed sensor, and the rotating speed and the torque of the second pulley can be measured through the second torque rotating speed sensor, so that the transmission loss efficiency is calculated.

Description

Technical Field

[0001] The invention relates to the technical field of high-altitude wind power generation, and in particular to a friction loss testing device for a high-altitude wind power generation ground transmission system. Background Art

[0002] High-altitude wind energy is a renewable clean energy with abundant reserves and wide distribution. Compared with offshore and onshore wind energy, it has advantages such as high power density and stable wind direction, and has great potential for development and utilization. For high-altitude wind energy traction and ground components, the development of efficient and reliable air-to-ground energy transmission and power conversion technologies and solutions is the key to achieving long-chain multi-power flow efficient and reliable energy transmission and conversion. Therefore, it is particularly important to explore the friction characteristics of cables and drums / pulleys by designing friction loss test devices. Summary of the invention

[0003] The present invention provides a friction loss testing device for a high-altitude wind power ground transmission system, which can simulate complex working conditions of high-altitude power generation to obtain the equivalent friction coefficient between the cable and the drum and the transmission loss efficiency between the cable and the pulley.

[0004] The present invention provides a friction loss test device for a high-altitude wind power ground transmission system, comprising a first test assembly, a second test assembly and an intermediate transition assembly, wherein the first test assembly is used to measure the equivalent friction coefficient between a first cable and a drum, first tension sensors are arranged at both ends of the first cable, the first cable is wrapped around the drum, the second test assembly is used to measure the transmission loss efficiency between the second cable and the pulley, the intermediate transition assembly comprises a power source, a gear box, a clutch, a first coupling and a first pulley, the power source is connected to the gear box, the clutch is arranged between the gear box and the first test assembly, the gear box is connected to the first pulley through a first coupling, a first torque speed sensor is arranged on the first coupling, the second test assembly comprises a second pulley, a second coupling and a brake connected in sequence, a second torque speed sensor is arranged on the second coupling, and the first pulley can be connected to the second pulley through the second cable;

[0005] When performing the test of the equivalent friction coefficient, the clutch is in a connected state and the second cable is in a disconnected state, and the power source is capable of driving the drum of the first test assembly to rotate and the first pulley to keep idling;

[0006] When testing the transmission loss efficiency, the clutch is in an unconnected state and the second cable is in a connected state, the brake is working, and the power source can drive the first pulley to rotate and drive the second pulley to rotate through the second cable.

[0007] Beneficial effects:

[0008] The friction loss test device of the high-altitude wind power ground transmission system provided by the present invention is provided with a first test component, a second test component and an intermediate transition component, so that when the equivalent friction coefficient is tested, the clutch is in a connected state and the second cable is in an unconnected state, the power source can drive the drum of the first test component to rotate and the first pulley to keep idling, so that the equivalent friction coefficient can be calculated by the wrap angle of the first cable and the tension of the first cable in the current state measured by the first tension sensor; when the transmission loss efficiency is tested, the clutch is in an unconnected state and the second cable is in a connected state, the brake works, the power source can drive the first pulley to rotate, and the second pulley is driven to rotate by the second cable, so that the speed and torque of the first pulley in the current state can be measured by the first torque speed sensor and the speed and torque of the second pulley in the current state can be measured by the second torque speed sensor, so as to calculate the transmission loss efficiency. Therefore, the above technical scheme can realize the simulation of complex working conditions of high-altitude power generation to obtain the equivalent friction coefficient between the cable and the drum and the transmission loss efficiency between the cable and the pulley. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0010] Figure 1 A schematic structural diagram of a friction loss testing device for a high-altitude wind power ground transmission system according to an embodiment is shown;

[0011] Figure 2 for Figure 1 A schematic structural diagram of a first test assembly in the friction loss test device shown;

[0012] Figure 3 for Figure 1 A schematic diagram of the structure of the second test assembly in the friction loss testing device shown.

[0013] Reference numerals:

[0014] 1-First test component;

[0015] 11- First cable;

[0016] 111-briquetting;

[0017] 112-a first tension sensor;

[0018] 113-Hanging block;

[0019] 12-reel;

[0020] 121-fixed block;

[0021] 122-fixing ring;

[0022] 123-washer;

[0023] 13- Wrap angle adjuster;

[0024] 131-adjustment hole;

[0025] 14-Force loader;

[0026] 2- Second test component;

[0027] 21 - second cable;

[0028] 22- second pulley;

[0029] 23- second coupling;

[0030] 24-brake;

[0031] 25- a second torque speed sensor;

[0032] 26- first moving mechanism;

[0033] 27- second moving mechanism;

[0034] 28-One-way slide;

[0035] 3-Intermediate transition component;

[0036] 31- Power source;

[0037] 32-Gear box;

[0038] 33- Clutch;

[0039] 34- first coupling;

[0040] 35-first pulley;

[0041] 36-First torque speed sensor. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0043] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0044] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0045] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", "middle" and the like appear to indicate directions or positional relationships, they are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the product of the invention is usually placed when in use. These 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 direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0046] like Figures 1 to 3 As shown, the embodiment of the present invention provides a friction loss test device for a high-altitude wind power ground transmission system, including a first test component 1, a second test component 2 and an intermediate transition component 3, the first test component 1 is used to measure the equivalent friction coefficient between the first cable 11 and the drum 12, both ends of the first cable 11 are provided with a first tension sensor 112, the first cable 11 is wrapped around the drum 12, the second test component 2 is used to measure the transmission loss efficiency between the second cable 21 and the pulley, the intermediate transition component 3 includes a power source 31, a gear box 32, a clutch 33, a first coupling 34 and a first pulley 35, the power source 31 is connected to the gear box 32, the clutch 33 is arranged between the gear box 32 and the first test assembly 1, the gear box 32 is connected to the first pulley 35 through the first coupling 34, the first coupling 34 is provided with a first torque speed sensor 36, the second test assembly 2 includes a second pulley 22, a second coupling 23 and a brake 24 connected in sequence, the second coupling 23 is provided with a second torque speed sensor 25, and the first pulley 35 can be connected to the second pulley 22 through the second cable 21;

[0047] When testing the equivalent friction coefficient, the clutch 33 is in a connected state and the second cable 21 is in a disconnected state, and the power source 31 can drive the drum 12 of the first test assembly 1 to rotate and the first pulley 35 to keep idling;

[0048] When testing the transmission loss efficiency, the clutch 33 is in an unconnected state and the second cable 21 is in a connected state, the brake 24 is working, and the power source 31 can drive the first pulley 35 to rotate, and drive the second pulley 22 to rotate through the second cable 21.

[0049] In this embodiment, by setting the first test component 1, the second test component 2 and the intermediate transition component 3, when the equivalent friction coefficient is tested, the clutch 33 is in a connected state and the second cable 21 is in an unconnected state, the power source 31 can drive the drum 12 of the first test component 1 to rotate and the first pulley 35 to keep idling, so that the equivalent friction coefficient can be calculated by the wrap angle of the first cable 11 and the tension of the first cable 11 in the current state measured by the first tension sensor 112; when the transmission loss efficiency is tested, the clutch 33 can be in an unconnected state and the second cable 21 is in a connected state, the brake 24 works, the power source 31 can drive the first pulley 35 to rotate, and drive the second pulley 22 to rotate through the second cable 21, so that the speed and torque of the first pulley 35 in the current state can be measured by the first torque speed sensor 36 and the speed and torque of the second pulley 22 in the current state can be measured by the second torque speed sensor 25, so as to calculate the transmission loss efficiency. Therefore, the above technical solution can simulate the complex working conditions of high-altitude power generation to obtain the equivalent friction coefficient between the cable and the drum and the transmission loss efficiency between the cable and the pulley.

[0050] It can be understood that the test device includes a mechanical support part, a power loading part and a measurement and control part, among which: the mechanical support part provides stable support and reasonable layout for the whole to ensure the stability of the test process; the power loading part can provide torque to control the relative motion state between the rope drums, and can flexibly adjust the loading force to simulate the friction and wear conditions under various actual working conditions; the measurement and control part is equipped with high-precision sensors, which can accurately measure key physical quantities such as tension, rotation speed, torque, etc. in real time, and calculate the equivalent friction coefficient and transmission loss efficiency by processing these data.

[0051] In some embodiments, the power source 31 may be a servo motor, or other types of power mechanisms, which are not specifically limited herein.

[0052] In some embodiments, the clutch 33 may be an electromagnetic clutch, or other types of clutches, which are not specifically limited herein.

[0053] In some embodiments, the brake 24 may be a magnetic powder brake, or other types of brakes, which are not specifically limited herein.

[0054] In some embodiments, the gear box 32 may be a bevel gear transmission having a dual-axis output feature.

[0055] In one embodiment of the present invention, the first test assembly 1 includes an angle adjuster 13 disposed on both sides of the drum 12 , both ends of the first cable 11 are fixed on the angle adjuster 13 , and the angle adjuster 13 is used to adjust the angle formed by the first cable 11 .

[0056] In one embodiment of the present invention, both ends of the first cable 11 are provided with a pressure block 111, a first tension sensor 112 and a hanging block 113 which are connected in sequence, and the wrap angle adjuster 13 is provided with a plurality of adjustment holes 131. The hanging block 113 can be clamped in the adjustment hole 131, and the wrap angle formed by the first cable 11 is adjusted by changing the position of the hanging block 113 in the adjustment hole 131.

[0057] In one embodiment of the present invention, the first test assembly 1 further comprises a force loader 14 connected to each wrap angle adjuster 13 , and the force loader 14 can be adjusted up and down to adjust the height of the wrap angle adjuster 13 , thereby changing the tension of the first cable 11 .

[0058] In one embodiment of the present invention, the force loader 14 adopts a hydraulic loading method. Of course, other types of loading methods may also be used, which are not specifically limited here.

[0059] In one embodiment of the present invention, a fixing block 121 is disposed on the outer periphery of the drum 12, the fixing block 121 is used to install a fixing ring 122, the fixing ring 122 is used to install a washer 123, and the washer 123 is used to contact the first cable 11. By providing the fixing block 121, relative sliding between the fixing ring 122 and the drum 12 can be prevented.

[0060] In one embodiment of the present invention, the second test assembly 2 further includes a first moving mechanism 26 and a second moving mechanism 27, wherein the first moving mechanism 26 is used to drive the second pulley 22 to move laterally along the horizontal plane, and the second moving mechanism 27 is used to drive the second pulley 22 to move longitudinally along the horizontal plane.

[0061] In some embodiments, the first moving mechanism 26 and the second moving mechanism 27 are both stepping motors. Of course, they may also be other moving mechanisms, which are not specifically limited here.

[0062] In one embodiment of the present invention, the second pulley 22 is disposed on a one-way slide 28, the one-way slide 28 is provided with a second tension sensor, the sliding direction of the one-way slide 28 is perpendicular to the axis of the second pulley 22, and the second tension sensor is used to detect the tension of the second cable 21 exerted on the one-way slide 28. By providing the one-way slide 28, actual working conditions can be simulated.

[0063] In one embodiment of the present invention, the second coupling 23 is a cross coupling, so as to avoid the problem that the first pulley 35 and the second pulley 22 are not on the same horizontal line due to misalignment.

[0064] The specific working principle of the above device is introduced below:

[0065] 1. When testing the equivalent friction coefficient, start the two-end force loaders 14, and use the force transmission to finally act on the first cable 11, so that the first cable 11 is in a tensioned state and in close contact with the drum 12. At this time, the drum 12 is in a completely static state, and the entire device is in an initial condition of balance and no relative motion. The electromagnetic clutch (i.e., clutch 33) is energized, and the electromagnetic force inside it causes the clutch plate to be tightly combined, thereby accurately transmitting the torque from the output shaft of the gear box 32 to the drum shaft, driving the drum 12 to rotate, and at the same time taking off the second cable 21, at this time the first pulley 35 and the second pulley 22 are in a connected and disconnected state. The servo motor (i.e., power source 31) is started to gradually adjust the motor output torque according to its control signal and operating parameters. The adjustment process of the servo motor output torque can be precisely controlled. Starting from the initial zero torque value, it gradually increases according to the preset step size or change law. The servo motor transmits the torque through the gear box 32. The gear box 32 has a dual-axis output, one of which is connected to the electromagnetic clutch to transmit the torque to the drum end, and the other end is transmitted to the first pulley 35 through the first coupling 34. At this time, the first pulley 35 remains idle. Finally, in the process of gradually increasing the motor torque, the state changes of the drum 12 and the first cable 11 are closely monitored until the drum 12 changes from an absolute static state to a state where relative sliding just begins (i.e., the drum 12 and the first cable 11 produce relative sliding), and the corresponding motor output torque, loading force, cable wrap angle, and physical characteristics of the tension at both ends of the cable are recorded to calculate the equivalent friction coefficient.

[0066] 2. When testing the transmission loss efficiency, the electromagnetic clutch is in a disengaged state, which can effectively block the torque from being transmitted to the drum shaft. The second cable 21 is inserted into the first pulley 35 and the second pulley 22, so that the two ends are in an integrated state. The position of the one-way slide 28 is adjusted to adjust the deflection angle of the two pulleys, that is, the one-way slide 28 is adjusted to make the tension of the second cable reach the predetermined setting. At this time, the magnetic powder brake (i.e., the brake 24) is in a shutdown state. The servo motor (i.e., the power source 31) is started, and the servo motor transmits torque to the first pulley 35. When the speed of the first pulley 35 reaches the preset speed, the second pulley 22 is driven to rotate through the second cable 21. After stable rotation, the speed and torque parameter data transmitted by the torque sensors at both ends are recorded. Finally, after the servo motor is turned off, the magnetic powder brake is energized to provide a load to the magnetic powder brake, and the servo motor is started again. When the speeds of the first pulley 35 and the second pulley 22 are constant, the speed and torque parameter data on the torque sensors at both ends are recorded again to calculate the transmission loss efficiency.

[0067] In summary, the above technical solution has the following advantages:

[0068] 1) The two important functions of rope drum equivalent friction coefficient measurement and cable and wheel transmission loss efficiency test are organically integrated into the same device, avoiding the waste of resources in the traditional way of purchasing multiple sets of equipment due to different test requirements, significantly reducing equipment costs and test site requirements, and improving the comprehensive utilization rate of test resources.

[0069] 2) The electromagnetic clutch plays a key role in this device. When conducting the rope drum friction coefficient measurement test, the electromagnetic clutch can efficiently connect the drum and the gearbox to ensure stable power transmission and smooth test. When conducting the cable and pulley transmission loss efficiency test, the electromagnetic clutch can disconnect the drum, effectively avoiding the additional energy loss caused by unnecessary power transmission to the drum, significantly improving the energy utilization of the test system, and reducing the ineffective wear of the equipment, extending the service life of the equipment, and further reducing the test operation cost and equipment maintenance cost, providing a reliable guarantee for long-term and frequent test operations.

[0070] 3) The setting of the wrap angle adjuster and the one-way slide enables the key parameters in the test process - cable wrap angle, pulley deflection angle and cable tension to be flexibly adjusted according to different test requirements. This flexible adjustment capability greatly expands the scope of application of the device of the present invention, can simulate friction scenarios under various actual working conditions, and provides the possibility for comprehensive research on the changing laws of friction characteristics under different conditions, further enhancing the application value of the present invention in the field of friction testing.

[0071] It should be noted that, in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A friction loss test device for a high-altitude wind power ground transmission system, characterized in that: It includes a first test component, a second test component and an intermediate transition component, the first test component is used to measure the equivalent friction coefficient between the first cable and the drum, the first cable is provided with a first tension sensor at both ends, the first cable is wrapped around the drum, the second test component is used to measure the transmission loss efficiency between the second cable and the pulley, the intermediate transition component includes a power source, a gear box, a clutch, a first coupling and a first pulley, the power source is connected to the gear box, the clutch is arranged between the gear box and the first test component, the gear box is connected to the first pulley through the first coupling, the first coupling is provided with a first torque speed sensor, the second test component includes a second pulley, a second coupling and a brake connected in sequence, the second coupling is provided with a second torque speed sensor, and the first pulley can be connected to the second pulley through the second cable; When performing the test of the equivalent friction coefficient, the clutch is in a connected state and the second cable is in a disconnected state, and the power source is capable of driving the drum of the first test assembly to rotate and the first pulley to keep idling; When testing the transmission loss efficiency, the clutch is in an unconnected state and the second cable is in a connected state, the brake is working, and the power source can drive the first pulley to rotate and drive the second pulley to rotate through the second cable.

2. The friction loss testing device according to claim 1, characterized in that: The first test assembly includes wrap angle adjusters disposed on both sides of the drum, both ends of the first cable are fixed on the wrap angle adjusters, and the wrap angle adjusters are used to adjust the wrap angle formed by the first cable.

3. The friction loss testing device according to claim 2, characterized in that: Both ends of the first cable are provided with a pressure block, the first tension sensor and a hanging block connected in sequence, and the wrap angle adjuster is provided with a plurality of adjustment holes, and the hanging block can be clamped in the adjustment hole. The wrap angle formed by the first cable is adjusted by changing the position of the hanging block in the adjustment hole.

4. The friction loss testing device according to claim 2, characterized in that: The first test assembly further includes a force loader connected to each of the wrap angle adjusters, wherein the force loader can be adjusted up and down to adjust the height of the wrap angle adjuster, thereby changing the tension of the first cable.

5. The friction loss testing device according to claim 4, characterized in that: The force loader adopts a hydraulic loading method.

6. The friction loss testing device according to claim 1, characterized in that: A fixing block is disposed on the outer periphery of the drum, and the fixing block is used to install a fixing ring, and the fixing ring is used to install a washer, and the washer is used to contact the first cable.

7. The friction loss testing device according to claim 1, characterized in that: The second test assembly further includes a first moving mechanism and a second moving mechanism, wherein the first moving mechanism is used to drive the second pulley to move laterally along a horizontal plane, and the second moving mechanism is used to drive the second pulley to move longitudinally along the horizontal plane.

8. The friction loss testing device according to claim 7, characterized in that: The second pulley is arranged on a one-way slide, and the one-way slide is provided with a second tension sensor. The sliding direction of the one-way slide is perpendicular to the axis of the second pulley, and the second tension sensor is used to detect the tension of the second cable acting on the one-way slide.

9. The friction loss testing device according to claim 8, characterized in that: The second coupling is a cross coupling, and the first moving mechanism and the second moving mechanism are both stepping motors.

10. The friction loss testing device according to any one of claims 1 to 9, characterized in that: The power source is a servo motor.

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