CN217953846U - Multistage static loading test system and control system for fan blade - Google Patents

Abstract

A fan blade multistage static force loading test system and a control system adopt a control feedback unit to acquire tension in real time as force feedback, and realize automatic acquisition of information such as displacement, strain and the like; adopt a plurality of static loading test passageways respectively through mounting fixture to each static loading point of blade exerts force, has realized the coordination of the multistage synchronous static test of 100 meters high-power blade 8 points, steady, synchronous loading, can realize that the wind-powered electricity generation blade is not based on the self-adaptation control method of model, need not consider the force coupling condition of a plurality of loading points of blade in the loading process, realize that the load pulling force of every loading point is synchronous, steady change at the uniform velocity, guarantee the loading synchronization process mutual independence of every loading point simultaneously, have certain commonality, the utility model discloses a predictive control + fuzzy PID control algorithm adopts the speed control mode to servo motor, has improved work efficiency greatly when guaranteeing loading stability and security, has alleviateed workman intensity of labour and work load.

Description

Multistage static force loading test system and control system for fan blade

Technical Field

The utility model relates to a fan blade static loading control field, concretely relates to fan blade multistage static loading test system and control system.

Background

Wind power is becoming one of the hot spots for the development of new energy fields, and the size of a wind power blade is getting larger and larger in order to capture more energy. The fan blade is an important component of a fan unit and is also a component which is easy to damage in the fan unit, the efficiency, the service life and the performance of a wind generating set are directly influenced by the quality of the blade, and the development and the production of the blade relate to multiple disciplines and are high-tech products of the multiple disciplines. With the development and specification of wind power blade technology, for the autonomous design and production of megawatt wind power blades, the productization of the wind power blades must be certified by corresponding international organizations, and the static certification of the wind power blades is one of the indispensable certification projects of the wind power blades.

The fan blade static force loading test mainly aims at verifying the limit load borne by the fan blade, determining the actual rigidity of each section of the blade, checking and verifying the strength limit and rigidity performance of the fan blade and providing necessary test data and analysis results for structural optimization. The test load currently applied to the blade is based on two reasons: firstly, in order to verify the aging behavior of the blade, a full-scale failure test is carried out on the blade, the geometric nonlinearity of large deformation is emphasized, and the Brazier effect is found to induce the large deformation and further layered buckling on a spar cap to be the cause of structural failure; and secondly, in order to obtain the leave-factory authentication of the blade, a static loading test must be carried out on the blade.

The static test data is used for comparing the design calculation results, the calculated blade frequency value and the strain at the sensitive position of the blade are generally required to be respectively within the range of +/-5% and +/-10%, the design and manufacturing consistency can be determined only after the test value and the design calculation value reach the allowable range, and meanwhile, the design reliability and feasibility can be determined.

The static force loading test of the megawatt-level fan blade is mostly realized by adopting a multipoint synchronous loading method, namely, a multipoint synchronous loading mode is adopted, the load tension of each loading point is ensured to change at a constant speed in the loading process of the load tension so as to ensure that the load distribution is kept along with the increase of the load tension, and the load coupling phenomenon exists among control points in the multipoint loading process, so that the tension of the loading points is easy to change suddenly, and the blade is damaged due to the nonuniform change of stress. Due to the particularity of blade materials and structures, a blade model changes at any moment in the loading process, the coupling among a plurality of loading points is relatively complex, the difficulty is relatively high when rigid body coupling control is adopted, and the problem of the coupling among the loading points is difficult to completely eliminate by adopting a traditional decoupling control method. The method has no universality for the static force loading test of the megawatt fan blade.

The loading mode mainly adopts the vertical loading of a crane or the transverse side pulling mode of a winch. The loading mode of the crane has the defects that the loading force cannot be well coordinated and controlled, test data is inaccurate and the like, and the transverse side pulling mode is mainly applied to static tests of low-power blades at present because the space is limited. With the gradual development of the blade towards high power, the transverse side pulling has the defects of insufficient loading capacity, insufficient loading space and the like, and is gradually exposed. At present, a static loading test of a megawatt fan blade is usually completed by adopting a mode of vertically loading a plurality of cranes at multiple points, but the method has the defects of low loading and measuring precision, uneven load change, manual experience assistance for loading time and great limitation.

In the existing testing technology of the static force authentication test of the blade, the following problems mainly exist:

the utility model patent CN101949770.B, "wind turbine blade static force authentication test system" applied by eastern Electrical group eastern steam turbine Limited company 2010, 08.14 discloses a wind turbine blade static force authentication test system, which mainly comprises a signal detection element and a signal processing device, wherein the signal detection element consists of a force transducer and a strain gauge with temperature self-compensation, and the signal processing device is provided with a shunting calibration module and can recalibrate the sensitivity of the strain gauge; the remote distance detection module is arranged and can compensate the line loss of the internal resistance of the signal cable of the force transducer to the working voltage of the force transducer bridge; the device is provided with a leveling load and strain value zeroing module, and can automatically zero the load initial value and the strain initial value generated when the blade is leveled; the high-speed synchronous data acquisition card is provided, and can synchronously acquire and maintain the output signals of the signal detection element at a high speed. The utility model discloses a precision in only detecting has compensated, but does not introduce the aspect of the synchronous coordination uniformity of control.

The utility model patent CN108798995.B 'wind power blade static force control method, unit and system' applied by Beijing aerospace stada science and technology Limited company 2017, 05 and 5 discloses a wind power blade static force control method, unit and system all the time, including: acquiring the feedback tension of a loading point in real time, and determining the upper limit and the lower limit of a loading rate error according to the feedback tension of the loading point; and calculating the loading rate and the loading rate error of the real-time tension of the loading point according to the upper limit and the lower limit of the loading rate error, comparing the loading rate error with the upper limit and the lower limit of the loading rate error, and outputting a displacement parameter and a driving instruction in real time to realize static control on the wind power blade. When a plurality of loading points are loaded simultaneously, the utility model changes the loading rate of real-time tension by adjusting the rotating speed and the direction of the servo motor in real time, realizes the synchronous and uniform stable change of each loading point, does not need to consider the force coupling condition among the loading points of different wind power blades in the loading process, and the loading processes of the loading points are mutually independent; the method has the advantages of long operation process, low loading speed, long time and small tension, the completion of a loading and unloading test probably needs about 1 hour, the tension can only reach 100KN, the loading stage is only three, the maximum number of loading points is 5, and the oscillation error is large.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem that exists among the prior art, the utility model provides a multistage static force loading test system of fan blade, include: the device comprises a plurality of static force loading test channels, a plurality of fixing clamps, a fixing device and a control feedback unit;

the fixing device is vertically arranged on the ground, the blade to be measured is horizontally arranged on the ground, and one end of the blade to be measured is arranged on the fixing device;

one end of each static force loading test channel is arranged on the ground, and the other end of each static force loading test channel is fixed on each static force loading point of the blade through each fixing clamp;

in the multistage static loading test process, a plurality of loading test channels in the plurality are controlled to apply force to each static loading point of the blade through a fixed clamp respectively, and the blade is monitored through a control feedback unit to obtain stress data of the blade.

Preferably, the static loading test channel comprises: a loading device and a force transmission device;

the loading device is arranged on the ground; the force transmission device is respectively connected with the loading device and the fixed clamp;

and the static force loading work is finished by driving a loading device, and the static force is transmitted to the fixed clamp through the force transmission device.

Preferably, the force transmission device includes: a movable pulley block, a steel wire rope and a fixed pulley block; the assay system further comprises: hooking;

the hook is fixed with the tension sensor and then connected with the movable pulley block; and the steel wire rope sequentially passes through the movable pulley block and the fixed pulley block and then enters the loading device.

Preferably, the movable pulley group comprises one or more movable pulleys; the fixed pulley group comprises one or more fixed pulleys;

the number of the movable pulleys and the fixed pulleys is determined by the force and the displacement set by the multistage static loading test.

Preferably, the test system further comprises: a truss and a ground beam; the ground beam is pre-buried in advance, and the loading device is connected to the ground beam in a threaded mode through the truss; the fixed pulleys are fixed on the truss.

Preferably, the loading device includes: the device comprises a servo motor, a reduction gearbox, a winding drum, a baffle plate, a wire arrangement device and a fixed support;

the inlet end of the reduction gearbox is connected with the servo motor, and the outlet end of the reduction gearbox is connected with the winding drum;

the steel wire rope is wound in the winding drum;

the fixed support is of a concave structure, and one side of the winding drum is connected with the reduction gearbox and then arranged on the inner side of the concave part of the concave structure of the support in parallel with the wire arranging device; and the traverse unit axially rotates along the traverse unit;

the winding drum is connected with the wire arranging device gear;

the two reel baffles are arranged on two sides of the reel;

preferably, a plurality of guide slots have evenly been arranged on the winding displacement ware, the quantity of guide slot is unanimous with the number of turns of reel winding wire rope, loading attachment still includes the wire guide, the wire guide install in on the winding displacement ware, the wire guide is used for guaranteeing the guide slot motion on wire rope along the winding displacement ware.

Preferably, the control feedback unit comprises a three-coordinate displacement measuring instrument, a tension sensor and a strain gauge;

the tension sensors are multiple and the number of the tension sensors is consistent with that of the static force loading test channels, and the tension sensors are respectively arranged on the fixed clamps and connected with the force transmission device; the tension sensor is used for acquiring tension of the static loading channel in real time; outputting the tension through analog quantity signals;

the three-coordinate displacement measuring instrument is arranged on one side of all the force transmission devices and is positioned above the loading device; the three-coordinate displacement measuring instrument is used for collecting displacement information of the measured blade and converting the displacement information into a displacement signal for outputting;

the strain gauge is attached to the acquisition position of the measured blade process requirement and used for acquiring strain information of the measured blade and outputting the strain information;

wherein the blade stress data comprises: tension and displacement.

Preferably, the fixing clamp is made of wood; the fixture has a contoured configuration that cooperates with the blade.

Based on the same utility model discloses think, the utility model also provides a multistage static force loading test control system, include: the system comprises a multistage static force loading test system, a loading control unit and a data acquisition unit;

the multistage static force loading test system is the multistage static force loading test system for the fan blade provided by the utility model;

the loading control unit is in communication connection with the data acquisition unit and each static loading test channel in each multi-stage static loading test system and is used for controlling the appointed loading test channel to apply multi-stage static to a static loading point of the measured blade based on the stress data of the measured blade monitored at the last moment;

the data acquisition unit is also in communication connection with a control feedback unit in the multistage static force loading test system, and is used for acquiring stress data of the tested blade under the current multistage static force effect, which is monitored by the control feedback unit at the current moment, and transmitting the stress data to the loading control unit.

Preferably, the load control unit includes: comprises a PLC and a servo control cabinet;

the PLC is connected with a servo control cabinet through a bus, the servo control cabinet is connected with a servo motor of a loading device in the static force loading test channel and used for driving the servo motor to act so as to drive a hook in the force transmission device to complete loading of static force of the static force loading test channel.

Preferably, the test control system further comprises: the 24V weak current control cabinet and the strong current incoming line cabinet are operated in a moving mode; the mobile operation 24V weak current control cabinet is connected with the strong current incoming line cabinet through a 220V power line and a control line, and the servo control cabinet is connected with the mobile operation 24V weak current cabinet through a network cable; the servo control cabinet is connected with the strong current incoming cabinet through a 380V power supply.

Preferably, the test control system further comprises a plurality of switch buttons, and the switch buttons are arranged outside the mobile operation 24V weak current control cabinet;

the switch button includes: a working gear knob switch and a channel control knob switch;

the working position knob switch is provided with a plurality of positions and at least comprises: manual, automatic, and suspended modes;

the channel control knob switch includes: a selection knob switch and a speed knob switch;

and the control knob switches of the channels are respectively connected with the servo motors of the loading devices of the static loading test channels.

Preferably, the data acquisition unit includes: the intelligent end and the collector are in communication connection;

the collector is also connected with a tension sensor, a displacement sensor and a PLC; the intelligent end is used for acquiring signals output by the tension sensor and the displacement sensor and sending the analog quantity signals to the intelligent end and the PLC.

Preferably, the number of the designated loading test channels is 1 or more.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model provides a fan blade multistage static force loading test system which adopts a plurality of static force loading test channels, a plurality of fixed clamps, a fixing device and a control feedback unit; in the multistage static loading test process, the automatic acquisition of information is realized by monitoring the blade through a control feedback unit to obtain stress data of the blade, different torque outputs are realized by controlling a plurality of loading test channels to apply force to each static loading point of the blade through a fixed clamp respectively, and the loading stages, the loading time and the unloading time of each loading test channel can be independently set;

the utility model provides a multistage static force loading test control system, include based on the stress data control multistage static force loading test system of blade measured last time appointed static force loading test passageway to the static force loading point of blade measured exerts multistage static force; the method comprises the steps of collecting stress data of a measured blade under the current multistage static force effect, controlling a single loading test channel or simultaneously controlling a plurality of loading test channels by collecting tension in real time as force feedback to realize model-free self-adaptive control of the wind power blade without model decoupling, not considering the force coupling condition of a plurality of loading points of the blade in the loading process, realizing synchronous and uniform-speed stable change of the loading tension of each loading point, and simultaneously ensuring that the loading synchronous processes of each loading point are mutually independent and have certain universality; the loading consistency is controlled within 1 percent, and the single-stage loading and unloading only needs 2 minutes at the fastest speed, so that the working efficiency is greatly improved, and the labor intensity and the workload of workers are reduced.

Drawings

FIG. 1 is a schematic view of a blade system loading;

FIG. 2 is a schematic view of a spool organizer;

FIG. 3 is a schematic structural diagram of a multistage static loading test control system;

FIG. 4 is a diagram of 8-channel control hardware architecture;

FIG. 5 is a topology diagram of an 8-channel network in embodiment 4;

FIG. 6 is a control cabinet group diagram;

FIG. 7 is a graph showing the tensile force setting in example 4;

FIG. 8 is a graph of the feedback force of the tension sensor in practical loading in example 4;

fig. 9 is a force feedback plot for example 4 at 60% loading.

In FIG. 1, 1-1: blade, 1-2: fixing clamp, 1-3: tension sensor, 1-4: hook, 1-5: movable pulley block, 1-6: steel wire rope, 1-7: three-coordinate displacement measuring instrument, 1-8: a fixed pulley block, 1-9: truss, 1-10: ground beam, 1-11: strain gauge, 1-12: connecting device, 1-13: base, 1-15: loading device (1), 1-16: loading device (2), 1-17: loading device (3), 1-18: loading device (4), 1-19: loading device (5), 1-20: loading device (6), 1-21: loading device (7), 1-22: a loading device (8);

in FIG. 2, 2-1: servo control cabinet, 2-2: servo motor, 2-3: reduction gearbox, 2-4: roll blind, 2-5: reel, 2-6: bracket, 2-7: wire guide, 2-8: wire arranging device, 2-9: driven gear, 2-10: separator, 2-11: adjusting hand wheel, 2-12: chain, 2-13: driving gear, 2-14: and fixing the bracket.

Detailed Description

In order to overcome above-mentioned prior art not enough, the utility model provides a multistage static loading test system of fan blade can apply multistage static loading uninstallation test to a plurality of measurement stations of hectometer fan blade, the utility model discloses a loading device vertical loading's mode, great saving area on the basis that satisfies experimental requirement, the utility model discloses still provide a multistage static loading test control system, every loading point is as independent control object, does not consider the coupling nature problem between each loading point, load pulling force value through the feedback, real-time adjustment servo motor rotational speed to change load pulling force in real time, realize that the load pulling force of every loading point is synchronous, at the uniform velocity stable change, control accuracy is within 1%, has solved the multistage synchronous loading's of big blade problem. The utility model discloses an equipment fixing is convenient, and interference immunity is strong, and the operation is convenient, and interface modularization, this equipment and method except can be used to wind-powered electricity generation blade static force loading field, but still wide application in the static force loading test of other field large-scale structures. For a better understanding of the present invention, reference is made to the accompanying drawings and examples, which are incorporated in and constitute a part of this specification.

Example 1:

the utility model provides a multistage static force loading test system of fan blade, it is shown including as figure 1 and 2: the device comprises a plurality of static force loading test channels, a plurality of fixing clamps 1-2, a fixing device and a monitoring unit;

the fixing device is vertically arranged on the ground, the tested blade 1-1 is horizontally arranged with the ground, and one end of the tested blade is arranged on the fixing device;

one end of each static force loading test channel is arranged on the ground, and the other end of each static force loading test channel is fixed on each static force loading point of the blade through each fixing clamp;

in the multi-stage static loading test process, the plurality of loading test channels are controlled to apply force to each static loading point of the blade through the fixed clamp respectively, and the blade is monitored through the monitoring unit to obtain stress data of the blade.

The application of this embodiment is exemplified by 8 sets of loading devices and signal acquisition devices, but is not limited to 8 sets, and the specific number of sets 8 is used only for the sake of more clear description of the present invention; the number of sets installed can be determined based on the size of the blade, the fineness of the test algorithm, and the cost. Each static loading test channel comprises: a loading device and a force transmission device; wherein, loading device includes: loading device (1)'s 1-15, loading device (2)'s 1-16, loading device (3)'s 1-17, loading device (4)'s 1-18, loading device (5)'s 1-19, loading device (6)'s 1-20, loading device (7)'s 1-21, loading device (8); the force transmission device includes: 1-5 parts of movable pulley block, 1-6 parts of steel wire rope and 1-8 parts of fixed pulley block; the monitoring unit includes: 1-3 parts of a tension sensor, 1-7 parts of a three-coordinate displacement measuring instrument and 1-11 parts of a strain gauge; the fixing device includes: connecting device 1-12, base 1-13; in addition, the experimental device further comprises: 1-4 hooks, 1-9 trusses and 1-10 ground beams.

The base 1-13 and the ground beam 1-10 are pre-embedded in advance and the strength is guaranteed, the blade 1-1 is installed on the base 1-13 through the fixing device 1-2, 8 loading points and loading devices are available on the blade in total, and the loading devices are in threaded connection with the ground beam 1-10 through the truss 1-9.

The blade 1-1 loading point is provided with a fixed clamp 1-2, in order to ensure the loading strength and not damage the blade, the fixed clamp 1-2 is a wood profiling structure, a tension sensor 1-3 is arranged below the fixed clamp to ensure real-time monitoring of tension, a hook 1-4 is fixed below the tension sensor 1-3, the lower part of the hook is matched with a movable pulley block 1-5 which is penetrated with a steel wire rope 1-6, the movable pulley block 1-5 is formed by combining a plurality of pulleys 1, 2, 3, 4, 5 and the like, and a plurality of groups of pulleys can be selected to realize the optimal matching of force and displacement;

similarly, the movable pulley blocks 1-5 are connected with the fixed pulley blocks 1-8 fixed on the loading device through steel wire ropes 1-6, and similarly, the fixed pulley blocks 1-8 have various specifications such as 1, 2, 3, 4 and 5 sheets and the like which can be selected and are matched with the movable pulley blocks to form various combinations such as 1 x 1,1 x 2 8230, 82305 and 5 x 5.

The tension sensor 1-3 has a calibration function and an overvoltage protection function, and outputs an analog quantity 4-20mA signal, and the displacement sensor 1-7 outputs the analog quantity in a network communication mode; the strain gauge 1-11 is attached to the process requirement acquisition position of the blade 1-1, and the strain information of the blade is acquired and transmitted through each static loading test channel.

The loading device adopts a winch for vertical loading, so that the occupied area and civil engineering construction can be greatly saved. The wire guide device comprises 2-2 parts of a servo motor, 2-3 parts of a reduction gearbox, 2-4 parts of a winding drum baffle, 2-5 parts of a winding drum, 2-6 parts of a bracket, 2-7 parts of a wire guide, 2-8 parts of a wire arranging device, 2-9 parts of a driven gear, 2-10 parts of a separator, 2-11 parts of an adjusting hand wheel, 2-12 parts of a chain, 2-13 parts of a driving gear and 2-14 parts of a fixed support.

A reduction box 2-3 and a winding drum 2-5 are fixed on a fixed support 2-14, the inlet end of the reduction box 2-3 is connected with a servo motor 2-2, the outlet end of the reduction box 2-3 is connected with the winding drum 2-5, a steel wire rope 1-6 is wound in the winding drum 2-5, and winding drum baffles 2-4 are arranged on two sides of the winding drum 2-5 to prevent the steel wire rope from deviating.

The wire arranging device comprises a fixed support 2-14, a winding drum 2-5, a wire guider 2-7 and a wire guider 2-7, wherein the wire guider 2-8 is arranged on the fixed support 2-14 in parallel with the winding drum 2-5, guide grooves are uniformly distributed in the wire arranging device 2-8, the number of the guide grooves is consistent with the number of turns of steel wire wound on the winding drum 2-5, the wire guider can adapt to forward rotation and overturning, and the steel wire 1-6 can be guaranteed to move along the guide grooves in the wire arranging device 2-8 by the wire guider 2-7.

A driving gear 2-13 is mounted at the shaft end of the winding drum 2-5, a driven gear 2-9 is mounted at the shaft end of the wire arranging device 2-8, the driving gear 2-13 is connected with the driven gear 2-9 through a chain 2-12, so that the wire arranging device 2-8 can be ensured to move synchronously along with the winding drum, and the steel wire ropes 1-6 can be ensured to be orderly and tightly arranged when being output when the winding drum 2-5 rotates; an adjusting hand wheel 2-11 is fixedly arranged on the outer side of the driven wheel 2-9, a separator 2-10 is arranged between the adjusting hand wheel 2-11 and the driven wheel 2-9, the driven wheel 2-9 can be separated from the wire arranging device 2-8, and therefore the position of the wire guiding device 2-7 can be adjusted under the action of the adjusting hand wheel 2-11, and the position of the steel wire rope 1-6 on the winding drum 2-5 and the wire arranging device 2-8 is guaranteed to be consistent.

Example 2

Based on the same utility model concept, the utility model also provides a multistage static force loading test control system, as shown in fig. 3, comprising a multistage static force loading test system, a loading control unit, a control feedback unit and a data acquisition unit;

here, the multistage static force loading test system is the fan blade multistage static force loading test system provided by the utility model; the specific structure is shown in embodiment 1, and is not described herein again.

The loading control unit is in communication connection with the data acquisition unit and each static loading test channel in each multi-stage static loading test system and is used for controlling the appointed loading test channel to apply multi-stage static force to the static loading point of the tested blade based on the stress data of the tested blade monitored at the last moment;

the data acquisition unit is also in communication connection with a control feedback unit in the multistage static force loading test system and is used for acquiring stress data of the tested blade under the current multistage static force action, which is monitored by the control feedback unit at the current moment, and transmitting the stress data to the loading control unit.

The loading control unit completes static loading work and comprises a PLC (programmable logic controller) and a servo controller. The PLC is arranged in the mobile operation 24V weak current control cabinet; the servo controller is arranged in the servo control cabinet 2-1, and network equipment and a power supply device are also arranged in the servo control cabinet; the PLC selects Siemens S7-1500, the servo driver selects Siemens V90, the servo motor adopts a speed mode, the PLC drives the servo motor to rotate forwards and backwards and operate at high and low speeds through a bus by using an FB284 block, and the servo motor drives a steel wire rope through a reduction gearbox so as to drive a hook to complete force loading.

The signal acquisition module acquires a tension signal output by the tension sensor and a displacement signal output by the displacement sensor and then transmits the tension signal and the displacement signal to the PLC so as to facilitate the control of the servo motor.

Fig. 4 is a control hardware structure diagram, each loading point is an independent servo control system, the PLC is accessed through a switch, displacement information is measured through a three-coordinate measuring instrument, the displacement information also enters the PLC control system through network communication, a strain gauge and tension force enter a computer acquisition channel through an acquisition system, a tension sensor is also accessed into the PLC system to be controlled as feedback, and other information such as a working gear knob, a loading and unloading button, an acceleration and deceleration button, a status lamp and an alarm lamp enter the PLC control system.

The data acquisition unit comprises an intelligent end, and data acquisition software and an acquisition device which are installed on the intelligent end. The intelligent terminal can be a computer or intelligent equipment; the collector is a high-speed synchronous data collector. And in the loading process, the collector collects the data of the strain gauge, the tension data and the displacement data in a high-frequency real-time manner and records the data into a computer or an intelligent terminal by using data collection software.

The static loading test control system also comprises a strong current incoming cabinet, and the weak current and the strong current are separated, so that the interference can be effectively avoided; an isolation transformer, a circuit breaker, a motor protector and a filter are arranged in the strong current inlet cabinet, the isolation transformer can be isolated from an external power supply to prevent interference, the filter can ensure the quality of the power supply, and the motor protector can protect the motor; the servo driver mainly completes loaded power output; the 24V weak current control cabinet is provided with a touch screen, a PLC, a working gear knob, a loading and unloading button, an acceleration and deceleration button, a status lamp, an alarm lamp, a 24V power supply, a collection module and the like.

The mobile operation 24V weak current control cabinet is connected with the strong current inlet cabinet through a 220V power line and a control line, the field servo control cabinet is only connected with the mobile operation 24V weak current cabinet through a network cable, and the field servo control cabinet is only connected with the strong current inlet cabinet through a 380V power supply.

A plurality of switch buttons, comprising: a working gear knob switch, a control knob switch of each channel and the like;

the working gear knob switch is provided with three gears which respectively correspond to a manual operation mode, an automatic operation mode and a suspension mode;

and the control knob switches of the channels are respectively connected with the servo motors of the loading devices of the static loading test channels.

When the working gear knob corresponds to manual operation, controlling knob switches to execute a multistage static force loading test based on each channel connected with a servo motor of a loading device of each static force loading test channel;

when the working gear knob corresponds to a suspension mode, only acquisition can be carried out, and loading and unloading cannot be carried out; namely, only the stress data of the tested blade under the current multistage static force action can be acquired.

When corresponding automatic operation when unsettled mode with the work gear knob, can be according to preset's procedure automatic execution the utility model provides a pair of multistage static force loading test control. The preset program is a control method prepared in advance to meet the necessary experimental operation, and includes setting some experimental parameters and the like.

The utility model discloses well each channel control knob switch includes two following switches at least: a loading and unloading button and an acceleration and deceleration button;

wherein, the loading and unloading button has two gears: a loading gear and an unloading gear;

the acceleration and deceleration button also has two gears: an upshift and a downshift; when an acceleration gear is selected, the speed is increased by one unit speed (for example, 10% of the maximum force of the channel) at the current value every time the acceleration gear is selected until the maximum speed is reached; similarly, when the deceleration gear is selected, every time the deceleration gear is selected, the speed is reduced by one unit speed (for example, 10% of the maximum force of the channel) at the current value until the speed reaches 0; of course, the present embodiment also supports other speed control methods, and here, it is only illustrated as an example that the multi-stage speed adjustment can be performed, and as long as the multi-stage speed adjustment can be achieved, the present invention is within the protection scope of the present invention, and these are not listed here.

Static loading of any point number of 1-8 points (such as 5-point loading) is selected according to actual requirements. The maximum load, the loading stage number, the target value, the stable range and the stable load-holding time of each stage of the system channel can be freely set.

All cable joints adopt quick plugs and are waterproof and dustproof.

Example 3:

it is right to adopt 7 five grades of static loading static test control as an example below with 95 meters wind-powered electricity generation blades of certain 10MW unit the utility model provides a multistage static loading test system of fan blade, control system and control method introduce.

The five-stage loading static test setting parameters of 7 loading points in the implementation are shown in table 1:

TABLE 1

Here, the five-stage loading static test at the loading point comprises: sequentially according to the proportion of 20% -40% -60% -80% -100% -80% -60% -40% -20%.

The embodiment comprises a fan blade multistage static loading test system shown in figures 1 and 2 and a multistage static loading test control system shown in figure 3.

In the present embodiment, the network topology shown in fig. 5 is adopted, wherein the address of the PLC is 192.168.0.1, the man-machine interface is 192.168.0.2, the computer is 192.168.0.3, the loading points are 192.168.0.11-192.168.0.18, respectively, and the displacement measurement system is 192.168.0.21.

This embodiment adopts the utility model provides a pair of multistage static loading test control method, including the mode that predictive control + PID control combined together, when the pulling force of feedback and target pulling force when more than 5%, adopt predictive control, utilize average speed steady operation, when arbitrary passageway feedback pulling force and target pulling force when within 5%, all passageways start PID control (proportion-integral-differential controller), calculate motor speed according to feedback pulling force and settlement pulling force, can guarantee the loading precision like this when guaranteeing loading speed, and not based on the model, need not to carry out complicated force control decoupling zero operation.

The pulling force and the motor speed are both in percentage form, wherein the pulling force f (k) is the percentage of the real-time feedback pulling force to the pulling force when 100% loading is set, and the motor speed is the percentage of the real-time rotating speed to 1500 full revolutions, so that the consistency of Kp, ki and Kd of each loading point is ensured.

When loading, the motor speed cannot be less than 0, if the motor speed is less than 0, the motor speed is set to 0, and stepping is performed in situ; similarly, the motor speed cannot be greater than 0 during unloading, if the motor speed is greater than 0, the motor speed is set to be 0, and stepping is performed in situ.

FIG. 6 is a control cabinet grouping diagram, a control system is divided into a mobile operation 24V weak current control cabinet, a strong current incoming cabinet and a field servo control cabinet, and weak current and strong current are separated to effectively avoid interference; the strong-current incoming cabinet comprises an isolation transformer, a circuit breaker, a motor protector and a filter, wherein the isolation transformer can be isolated from an external power supply to prevent interference, the filter can ensure the quality of the power supply, and the motor protector can protect the motor; the field servo control cabinet comprises a servo motor and a servo driver and mainly completes loaded power output. The mobile operation 24V weak current control cabinet is connected with the strong current inlet cabinet through a 220V power line and a control line, the field servo control cabinet is only connected with the mobile operation 24V weak current cabinet through a network line, and the field servo control cabinet is only connected with the strong current inlet cabinet through a 380V power supply.

FIG. 7 is a graph of tension setting, which can set the number of stages, the range of each stage of force and the inter-stage load retention time, such as the load retention time t1 (from one stage to two stages), t2, t3, until t9.

Fig. 8 is a graph of a feedback force of the tension sensor during actual loading, and it can be seen from the graph that the loading curve is smooth and the loading consistency is good.

Fig. 9 is a force feedback diagram when the load is 60%, and it can be seen from the diagram that the force control accuracy is within 1%.

The system is provided with 8 sets of loading devices and signal acquisition devices, static loading of any number of 1-8 points (such as 5-point loading) can be selected according to actual requirements, 7 channels are selected in the embodiment, and the maximum load, the loading stage number, the target value, the stable range and the stable load-holding time t1-t9 of each stage of the system channel can be freely set. The system has a calibration function of the tension sensor.

Example 4:

the wind power blade of 85 meters is controlled by adopting a 6-point five-level static loading static test, and the setting parameters of the 6-point five-level static loading static test are shown in the table 2:

TABLE 2

Here, the five-stage loading static test at the loading point comprises: sequentially according to the proportion of 20% -40% -60% -80% -100% -80% -60% -40% -20%. In the embodiment, a high-precision tension sensor is adopted to collect tension in real time at high frequency as force feedback, a servo motor adopts a speed control mode, a specially developed automatic wire arranging structure of a steel wire reel can realize orderly winding and unwinding of steel wire ropes, different torque outputs are realized through different combinations of a movable pulley and a fixed pulley, a vertical loading control system integrates an intelligent control technology, a network communication technology and a servo technology, the floor area is saved while the loading stability and safety are ensured, the coordination, the stability and the synchronous loading and unloading of a 7-point multistage static test of a 95-meter high-power blade are realized through a predictive control and fuzzy PID control algorithm, the wind power blade can be subjected to model-based self-adaptive control without model decoupling without considering the force coupling condition of multiple loading points of the blade in the loading process, the synchronous and uniform-speed stable change of the loading tension of each loading point is realized, the loading synchronous and synchronous processes of each loading point are mutually independent, certain universality is realized, the modularized interface operation and installation are convenient, the anti-interference is strong, the loading stages are loaded, the loading, the unloading and the load-holding time can be independently set, the automatic collection of information such as displacement and strain is realized, the loading consistency is controlled within 1%, the single-stage labor intensity is greatly improved by 2 minutes, and the loading efficiency is greatly reduced, and the loading efficiency of workers is greatly improved. The technology can be used in the field of static loading of the wind power blade, and can also be widely applied to static loading tests of large-scale structures in other fields. It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention, and it is intended that the invention cover such modifications and modifications as fall within the scope of the appended claims and their equivalents.

It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The foregoing is illustrative of the present invention and is not to be construed as limiting thereof, and any modifications, equivalent alterations, improvements and the like which are made within the spirit and scope of the invention are intended to be encompassed by the claims which are appended hereto.

Claims (15)

1. The utility model provides a fan blade multistage static loading test system which characterized in that includes: the device comprises a plurality of static force loading test channels, a plurality of fixing clamps, a fixing device and a monitoring unit;

the fixing device is vertically arranged on the ground, the blade to be detected is horizontally arranged with the ground, and one end of the blade to be detected is arranged on the fixing device;

one end of each static loading test channel is arranged on the ground, and the other end of each static loading test channel is fixed on each static loading point of the blade through each fixing clamp;

in the multi-stage static loading test process, the plurality of loading test channels are controlled to apply force to each static loading point of the blade through the fixed clamp respectively, and the blade is monitored through the monitoring unit to obtain stress data of the blade.

2. The loading test system of claim 1, wherein the static loading test channel comprises: a loading device and a force transmission device;

the loading device is arranged on the ground; the force transmission device is respectively connected with the loading device and the fixed clamp;

and the static force loading work is finished by driving a loading device, and the static force is transmitted to the fixed clamp through the force transmission device.

3. The loading test system of claim 2, wherein the monitoring unit comprises a three-coordinate displacement gauge, a tension sensor, and a strain gauge;

the tension sensors are multiple and the number of the tension sensors is consistent with that of the static force loading test channels, and the tension sensors are respectively arranged on the fixed clamps and connected with the force transmission device; the tension sensor is used for acquiring the tension of the static loading channel in real time; outputting the tension through analog quantity signals;

the three-coordinate displacement measuring instrument is arranged on one side of all the force transmission devices and is positioned above the loading device; the three-coordinate displacement measuring instrument is used for collecting displacement information of the measured blade and converting the displacement information into a displacement signal to be output;

the strain gauge is attached to the acquisition position of the technological requirement of the measured blade and used for acquiring and outputting strain information of the measured blade;

wherein the blade force data comprises: tension and displacement.

4. The load testing system of claim 3, wherein the force transmission device comprises: a movable pulley block, a steel wire rope and a fixed pulley block; the assay system further comprises: hooking;

the hook is fixed with the tension sensor and then connected with the movable pulley block; and the steel wire rope sequentially passes through the movable pulley block and the fixed pulley block and then enters the loading device.

5. The load testing system of claim 4, wherein the set of movable pulleys comprises one or more movable pulleys; the fixed pulley group comprises one or more fixed pulleys;

the number of the movable pulleys and the fixed pulleys is determined by the force and the displacement set by the multistage static loading test.

6. The load testing system of claim 5, wherein the load testing system further comprises: a truss and a ground beam; the ground beam is pre-buried in advance, and the loading device is connected to the ground beam in a threaded mode through the truss; the fixed pulleys are fixed on the truss.

7. The loading test system of claim 4, wherein the loading device comprises: the device comprises a servo motor, a reduction box, a winding drum, a baffle plate, a wire arranging device and a fixed support;

the inlet end of the reduction gearbox is connected with the servo motor, and the outlet end of the reduction gearbox is connected with the winding drum;

the steel wire rope is wound in the winding drum;

the fixed support is of a concave structure, and one side of the winding drum is connected with the reduction gearbox and then is arranged inside a concave part of the concave structure of the fixed support in parallel with the wire arranging device; and the traverse unit axially rotates along the traverse unit;

the winding drum is connected with the wire arranging device gear;

the reel baffle is two and sets up in the reel both sides.

8. The loading test system of claim 7, wherein a plurality of guide slots are uniformly arranged on the wire arranging device, the number of the guide slots is consistent with the number of turns of the steel wire rope wound by the winding drum, and the loading device further comprises a wire guider, the wire guider is mounted on the wire arranging device, and the wire guider is used for ensuring that the steel wire rope moves along the guide slots on the wire arranging device.

9. The loading test system of claim 1, wherein the fixture is made of wood; the fixture has a contoured configuration that cooperates with the blade.

10. A multi-stage static loading test control system, comprising: the system comprises a multistage static loading test system, a loading control unit and a control feedback unit;

the multistage static loading test system is a fan blade multistage static loading test system as claimed in any one of claims 1 to 9;

the loading control unit is in communication connection with the control feedback unit and each static loading test channel in each multi-stage static loading test system and is used for controlling the appointed static loading test channel to apply multi-stage static to a static loading point of the tested blade based on the stress data of the tested blade monitored at the last moment;

the control feedback unit is also in communication connection with a monitoring unit in the multistage static force loading test system and is used for acquiring stress data of the tested blade under the current multistage static force effect, which is monitored by the monitoring unit at the current moment, and transmitting the stress data to the loading control unit.

11. The test control system of claim 10, wherein the load control unit comprises: the system comprises a PLC and a servo controller;

the PLC is connected with a servo controller through a bus, the servo controller is connected with a servo motor of a loading device in the static force loading test channel and used for driving the servo motor to act so as to drive a hook in a force transmission device of the static force loading test channel in the multistage static force loading test system to complete static force loading on the static force loading test channel.

12. The test control system of claim 11, further comprising: the system comprises a 24V weak current control cabinet, a servo control cabinet and a strong current incoming cabinet which are operated movably; the mobile operation 24V weak current control cabinet is connected with the strong current incoming line cabinet through a 220V power line and a control line, and the servo control cabinet is connected with the mobile operation 24V weak current cabinet through a network cable; the servo control cabinet is connected with the strong current incoming cabinet through a 380V power supply; the PLC is arranged in a mobile operation 24V weak current control cabinet; the servo controller is arranged in the servo control cabinet.

13. The test control system of claim 12, wherein a plurality of switch buttons are provided on the outside of the mobile operating 24V low-current control cabinet;

the switch button includes at least: a working gear knob switch and a channel control knob switch;

the gear of the working gear knob switch comprises: manual operation, automatic operation and suspension mode;

the channel control knob switch includes: loading and unloading buttons and acceleration and deceleration buttons;

and the control knob switches of the channels are respectively connected with the servo motors of the loading devices of the static loading test channels.

14. The test control system of claim 10, wherein the control feedback unit comprises a signal acquisition module connected to the tension sensor, the displacement sensor, and the PLC; the PLC is used for acquiring signals output by the tension sensor and the displacement sensor and sending the acquired signals to the PLC.

15. The test control system of claim 10, wherein the number of designated load test channels is 1 or more.

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