Profile adjusting mechanism for large wind tunnel

Abstract

The invention discloses a molded surface adjusting mechanism for a large wind tunnel, belongs to the field of wind tunnels, and aims to solve the problems that in the wind tunnel blowing process, the requirement for molded surfaces is very high, and the left-right height difference of molded surfaces perpendicular to the wind tunnel blowing direction is not consistent. The device comprises a suspension beam, a driving motor, a linkage shaft, a first positioning unit, a working cross beam, a second driving unit, a third self-adaptive unit and a control system, the first positioning unit comprises a first positioning support, a first worm, a first worm gear, a first bearing, a first transmission lead screw, a first lead screw nut matched with the first transmission lead screw, a first baffle, a first contact switch base, a first fixed cylinder, a first movable cylinder, a first travel switch and a first guide piece. The requirement for profile adjustment can be well met, the problem that the left-right height difference of the profile is inconsistent in the adjustment process is effectively solved, the adjustment precision is high, blowing data are accurate, and the stability and reliability of the profile in the test process can be effectively guaranteed.

Description

Technical Field

[0001] The present application relates to the field of wind tunnels, especially the field of wind tunnel equipment, and specifically to a profile adjustment mechanism for a large wind tunnel. Background Art

[0002] On the one hand, the profile adjustment process is very strict. During the adjustment of the upper and lower profiles, the gap between the left and right side walls and the upper and lower sides is less than 0.2 mm, and the left and right side walls are fixed. In this way, there must be no situation where the left - right height difference is inconsistent during the adjustment of the upper and lower profiles. If there is a certain height difference, it will cause scratching or jamming of the profile side walls, damaging the upper and lower profiles.

[0003] On the other hand, during the wind tunnel blowing process, high requirements are imposed on the profile. Especially if the left - right height difference is inconsistent, it will lead to unreliable blowing data and air flow disorder. Furthermore, after the air flow passes through the model area, the model will vibrate strongly. In severe cases, it will lead to a safety accident where the model is blown away.

[0004] Therefore, there is an urgent need for a new device and / or method to solve the above problems. Summary of the Invention

[0005] The invention object of the present application is: aiming at the above - mentioned problems, to provide a profile adjustment mechanism for a large wind tunnel. The present application can be used for rapid and precise adjustment of the profile, effectively solve the aforementioned problems, and has the advantage of high adjustment efficiency.

[0006] To achieve the above object, the present application adopts the following technical solutions: A profile adjustment mechanism for a large wind tunnel, comprising a suspension beam for connecting with the wind tunnel, a driving motor, a linkage shaft, a first positioning unit, a working cross - beam, a second driving unit, a third adaptive unit, and a control system; The first positioning unit includes a first positioning support, a first worm, a first worm gear, a first bearing, a first transmission lead screw, a first lead screw nut cooperating with the first transmission lead screw, a first baffle, a first contact switch seat, a first fixed cylinder, a first movable cylinder, a first travel switch, and a first guide member; The first positioning support is connected to the suspension beam and the suspension beam can provide support for the first positioning support. The first worm and the first worm gear are respectively arranged in the first positioning support and can rotate relative to the first positioning support respectively. The first worm meshes with the first worm gear and the first worm can drive the first worm gear to rotate; There are two first positioning units and two second driving units respectively. The two first positioning units are arranged in parallel; the first positioning unit close to the driving motor is denoted as the first positioning unit on the near - motor side, and the first positioning unit far from the driving motor is denoted as the first positioning unit on the far - motor side; The output shaft of the drive motor, the first worm of the first positioning unit on the near-motor side, the linkage shaft, and the first worm of the first positioning unit on the far-motor side are connected in sequence, and the drive motor can drive the first worm of the first positioning unit on the near-motor side and the first worm of the first positioning unit on the far-motor side to rotate synchronously through the linkage shaft; A first through hole matching with the first transmission lead screw is arranged in the suspension beam. The first bearing is arranged in the first through hole. The first transmission lead screw passes through the first through hole. The first transmission lead screw is connected with the first bearing and the first transmission lead screw can rotate relative to the first bearing. The first lead screw nut is arranged on the first transmission lead screw and the first lead screw nut can move along the axial direction of the first transmission lead screw; One end of the first transmission lead screw is connected with the first worm gear and the first worm gear can drive the first transmission lead screw to rotate synchronously. The first baffle is arranged at the other end of the first transmission lead screw and the first baffle can limit the first lead screw nut; One end of the first fixed cylinder is connected with the suspension beam. The other end of the first fixed cylinder is sleeved with the first movable cylinder and the first movable cylinder can move axially relative to the first fixed cylinder. The other end of the first movable cylinder is connected with the working cross beam. The first movable cylinder and the first fixed cylinder form a first telescopic assembly and the working cross beam can move relative to the suspension beam through the first telescopic assembly; The first transmission lead screw is located inside the first movable cylinder and the first movable cylinder can move along the axial direction of the first transmission lead screw. The first movable cylinder is located inside the first fixed cylinder. A first inner guiding through hole is arranged along the axial direction of the first movable cylinder. A first outer guiding through hole matching with the first inner guiding through hole is arranged along the axial direction of the first fixed cylinder; The first contact switch seat is connected with the first lead screw nut and the first lead screw nut can drive the first contact switch seat to move synchronously. The first contact switch seat passes through the first inner guiding through hole and the first outer guiding through hole in sequence, and the first inner guiding through hole and the first outer guiding through hole can respectively limit the first contact switch seat. The first travel switch is connected with the first contact switch seat and the first contact switch seat can provide support for the first travel switch; The first guiding member is connected with the first movable cylinder and the first movable cylinder can drive the first guiding member to move synchronously. The first guiding member passes through the first outer guiding through hole. The first guiding member can move axially relative to the first outer guiding through hole along the first movable cylinder and the first guiding member can contact with the first travel switch and trigger the first travel switch; The two second driving units are arranged in parallel with each other. The second driving unit includes a second driving oil cylinder, a second oil cylinder ear seat, and a second connecting member. The second driving oil cylinder is connected to the suspension beam, and the suspension beam can provide support for the second driving oil cylinder. The second connecting member is connected to the working cross beam, and the working cross beam can provide support for the second connecting member. The second driving oil cylinder, the second oil cylinder ear seat, and the second connecting member are connected in sequence, and the second driving oil cylinder can drive the suspension beam to move synchronously through the second oil cylinder ear seat and the second connecting member in sequence; The third adaptive unit includes at least two third adaptive components. The third adaptive component includes a third linear member, a third T-shaped rotating member, a first rotating connecting member, a second rotating connecting member, a third rotating connecting member, a first fixed connecting member, a second fixed connecting member, and a third flexible plate for cooperating with the wall plate of the flexible nozzle section of the wind tunnel; The third T-shaped rotating member is composed of a first horizontal connecting portion and a first vertical connecting portion. The first horizontal connecting portion and the first vertical connecting portion are connected as a whole and arranged in an inverted T shape. The first horizontal connecting portion of the third T-shaped rotating member is arranged with unequal arms; one end of the third linear member is connected to the working cross beam, and the working cross beam can drive the third linear member to move synchronously. The other end of the third linear member is hinged to the first vertical connecting portion, and the third T-shaped rotating member can rotate relative to the third linear member through the first vertical connecting portion; The short arm on the first horizontal connecting portion is denoted as the first horizontal connecting arm, and the long arm on the first horizontal connecting portion is denoted as the second horizontal connecting arm; The first fixed connecting member is connected to the third flexible plate. One end of the first rotating connecting member is hinged to the first horizontal connecting arm, and the other end of the first rotating connecting member is hinged to the first fixed connecting member; The second fixed connecting member is connected to the third flexible plate; one end of the second rotating connecting member is hinged to the second horizontal connecting arm, and the other end of the second rotating connecting member is hinged to the second fixed connecting member; one end of the third rotating connecting member is hinged to the second horizontal connecting arm, and the other end of the third rotating connecting member is hinged to the second fixed connecting member; the second rotating connecting member is located between the first rotating connecting member and the third rotating connecting member, and the central axis of the third rotating connecting member is inclined relative to the central axis of the second rotating connecting member; The driving motor, the first travel switch, and the second driving oil cylinder are respectively connected to the control system.

[0007] It further includes a motor seat. The motor seat is connected to the first positioning support of the first positioning unit near the motor side, and the first positioning support can provide support for the motor seat. The driving motor is connected to the motor seat, and the motor seat can provide support for the driving motor.

[0008] The cross-section of the first movable cylinder along its axial direction is circular or polygonal. The cross-section of the first fixed cylinder along its axial direction is circular or polygonal.

[0009] The cross-section of the first movable cylinder along its axial direction and the cross-section of the first fixed cylinder along its axial direction are respectively circular, and the inner diameter of the first fixed cylinder is larger than the outer diameter of the first movable cylinder.

[0010] The first inner guiding through-hole and the first outer guiding through-hole are respectively strip-shaped holes.

[0011] The first positioning unit further includes a first counter that cooperates with the first worm gear, and the first counter can count the rotation of the first worm gear.

[0012] The first counter is a five-digit mechanical counter or an electronic counter.

[0013] The first counter is connected to the control system, and the first counter can transmit the measured information to the control system.

[0014] There is one first counter, and the first counter is used to count the rotation of the first worm gear in the first positioning unit on the far side of the motor; Or there are two first counters, and the two first counters can respectively count the rotation of the two first worm gears.

[0015] The first counter is an absolute encoder.

[0016] The second driving units are evenly distributed between the two first positioning units.

[0017] The first positioning unit, the second driving unit, the second driving unit, and the first positioning unit are arranged in sequence.

[0018] A plurality of process holes are provided on the working crossbeam.

[0019] The second driving unit further includes a second retaining ring and a second pin shaft, and the second oil cylinder ear seat and the second connecting member are connected by the second retaining ring and the second pin shaft.

[0020] The first movable cylinder includes a first movable cylinder section and a second movable cylinder section, and the first movable cylinder section and the second movable cylinder section are connected as a whole to form the first movable cylinder.

[0021] One side of the first horizontal connecting portion close to the suspension beam is arc-shaped.

[0022] The first fixed connecting member is in the shape of a right-angled triangle.

[0023] The central axis of the first rotating connecting member is arranged parallel to the central axis of the second rotating connecting member.

[0024] The application of the foregoing profile adjusting mechanism.

[0025] For the adjustment of the wind tunnel wall panel.

[0026] Used to adjust the corresponding Mach number of the wind tunnel wall panel.

[0027] The adjustment method using the aforementioned profile adjustment mechanism includes the following steps: (1) Set the profile adjustment mechanism on the back of the wall panel of the flexible nozzle section of the wind tunnel, and make the third flexible plate contact the back of the wall panel of the flexible nozzle section of the wind tunnel; (2) In the initial state, the second driving oil cylinder is in a contracted state; (3) When the wall panel of the flexible nozzle section of the wind tunnel needs to be bent, the control system sends a command to the driving motor to make the driving motor rotate; the driving motor can drive the first worm of the first positioning unit near the motor side and the first worm of the first positioning unit on the far motor side to rotate synchronously through the linkage shaft; due to the existence of the linkage shaft, the number of rotation circles of the first worm wheels at both ends of the linkage shaft is the same; through the first counter, the rotation of the first worm wheel in the first positioning unit on the far motor side is counted to ensure that the number of rotation circles of the two first worm wheels is the same, and then the rotation of the first transmission lead screw is precisely controlled; (4) The first transmission lead screw drives the first lead screw nut on it to rotate. Due to the existence of the first contact switch seat and the mutual cooperation between the first contact switch seat and the first inner guiding through hole and the first outer guiding through hole, after the first transmission lead screw rotates to the set number of circles, the first lead screw nut moves axially along the first transmission lead screw to the set position under the action of the first contact switch seat; (5) The control system sends a working command to the second driving oil cylinder to make the telescopic rod of the second driving oil cylinder extend; during the process of the telescopic rod of the second driving oil cylinder extending and retracting, the third adaptive unit frequently changes its posture to ensure that the jacking force of the second driving oil cylinder adapts to the bending change process of the wall panel of the flexible nozzle section of the wind tunnel and prevent the wall panel from being damaged; during the process of the second driving oil cylinder driving the working crossbeam to jack up, the working crossbeam drives the first movable cylinder to move synchronously; the first movable cylinder is connected to the first guiding member, and the first movable cylinder can drive the first guiding member to move synchronously; (6) When the first guiding member touches the first contact switch seat, the first travel switch is triggered; the first travel switch sends the touch signal to the control system. After receiving the touch signal, the control system sends a command to the second driving oil cylinder to make the second driving oil cylinder stop moving; at this time, the position of the profile at this place is accurately adjusted.

[0028] It also includes the following steps: (7) When it is necessary to return to the initial position, the control system sends a working command to the second driving oil cylinder to make the telescopic rod of the second driving oil cylinder contract until the telescopic rod of the second driving oil cylinder returns to the initial position; then, the control system sends a command to the driving motor to make the driving motor rotate in the reverse direction until the first lead screw nut returns to the initial position.

[0029] The use of this adjustment mechanism can accurately adjust the wall panel profile of the flexible nozzle section of the wind tunnel, thus meeting the requirements of precise and controllable adjustment.

[0030] As mentioned above, during the wind tunnel blowing process, very high requirements are placed on the profile. If the left-right height difference of the profile perpendicular to the wind tunnel blowing direction is inconsistent, it will lead to unreliable blowing data and may also cause air flow disorder, resulting in strong vibration of the model. Further, during the blowing process, due to the very high pressure of the air flow on the profile position, if there is no high-strength mechanism support, the profile will change during the blowing process, resulting in unreliable blowing data, scrapping of the blowing, and waste of energy.

[0031] Therefore, the present application provides a profile adjustment mechanism for a large wind tunnel to solve the above problems. The present application adopts the structural design of a symmetric first positioning unit and a second driving unit. The two first positioning units and the two second driving units respectively use components and designs of the same specification and model, which provides a basic hardware guarantee for profile adjustment; further, through the mutual cooperation between the linkage shaft, the first positioning unit, the working cross beam and the second driving unit, the present application can ensure that during the profile adjustment process, the left and right wall panels of the profile can move up and down simultaneously, and the left and right movement dimensions are exactly the same, effectively solving the problem of scraping or jamming with the side wall surface, and also avoiding the air flow disorder phenomenon in the model area caused by inconsistent left and right movement dimensions; further, when the profile adjustment mechanisms of the present application are fixed side by side, the entire profile can be accurately adjusted, and through the mutual cooperation between the profile adjustment mechanisms, the support strength of each part of the profile can be ensured, so that during the blowing test, the air flow rate in the model area is consistent, ensuring the reliability of the blowing data. Further, the present application adopts a new third adaptive unit, which can transmit the resultant force of the oil cylinder jacking to the flexible plate of the flexible nozzle section of the wind tunnel and effectively adapt to the bending change of the profile.

[0032] Further, the present application claims protection for the adjustment method of the foregoing profile adjustment mechanism, which can make the curve of the wind tunnel wall panel profile precisely controllable, with high adjustment efficiency, and at the same time solve the problem of the profile being unable to be adjusted quickly and accurately.

[0033] In summary, the present application can well meet the needs of profile adjustment, effectively solve the situation of inconsistent left-right height difference of the profile during the adjustment process, with high adjustment accuracy and accurate blowing data, and can effectively ensure the stability and reliability of the profile during the test process. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The present invention will be described by way of examples with reference to the accompanying drawings, wherein: Figure 1 is the overall structural schematic diagram of the profile adjustment mechanism of the present invention.

[0035] Figure 2 is Figure 1Combined schematic diagram of the second driving unit, suspension beam, working crossbeam and the third adaptive component.

[0036] Figure 3 is Figure 1 A-A view of

[0037] Figure 4 is Figure 1 B-B view of

[0038] Figure 5 is Figure 1 C-C view of

[0039] Figure 6 is Figure 1 Partial enlarged schematic diagram of I in

[0040] Figure 7 is Figure 1 Partial enlarged schematic diagram of II in

[0041] Figure 8 is Figure 1 Partial enlarged schematic diagram of III in

[0042] Markings in the figure: 1. Suspension beam, 2. Driving motor, 3. Linkage shaft, 4. Working crossbeam, 5. Third adaptive unit, 6. First positioning support, 7. First transmission lead screw, 8. First lead screw nut, 9. First baffle, 10. First contact switch seat, 11. First fixed cylinder, 12. First movable cylinder, 13. First travel switch, 14. First guide, 15. Second driving oil cylinder, 16. Second oil cylinder ear seat, 17. Second connecting piece, 18. Third linear piece, 19. Third T-shaped rotating piece, 20. First rotating connecting piece, 21. Second rotating connecting piece, 22. Third rotating connecting piece, 23. First fixed connecting piece, 24. Second fixed connecting piece, 25. Third flexible plate, 26. First counter, 27. First worm, 28. First worm gear. Specific implementation mode

[0043] All features disclosed in this specification, or all steps in the disclosed methods or processes, except for mutually exclusive features and / or steps, can be combined in any way.

[0044] Any feature disclosed in this specification, unless specifically described, can be replaced by other equivalent or similar-purpose alternative features. That is, unless specifically described, each feature is only an example of a series of equivalent or similar features.

[0045] Embodiment 1 This embodiment provides a profile adjustment mechanism for a large wind tunnel, including a suspension beam for connecting with the wind tunnel, a driving motor, a linkage shaft, a first positioning unit, a working crossbeam, a second driving unit, a third adaptive unit, and a control system. A number of process holes are provided on the working crossbeam. As shown in the figure, there are two first positioning units and two second driving units respectively. In this application, the sizes and specifications of the two first positioning units are all the same, and the sizes and specifications of the two second driving units are all the same to ensure that there is no vertical displacement difference between the left and right profiles relative to the axis of the wind tunnel.

[0046] Among them, the first positioning unit includes a first positioning support, a first worm, a first worm gear, a first bearing, a first transmission lead screw, a first lead screw nut cooperating with the first transmission lead screw, a first baffle, a first contact switch seat, a first fixed cylinder, a first movable cylinder, a first travel switch, and a first guide member.

[0047] The first positioning support is connected to the suspension beam, and the suspension beam can provide support for the first positioning support. The first worm meshes with the first worm gear to form a worm and worm gear assembly, and the first worm can drive the first worm gear to rotate. The first worm and the first worm gear are respectively arranged in the first positioning support, and the first worm and the first worm gear can respectively rotate relative to the first positioning support (that is, the worm and worm gear assembly is arranged in the first positioning support, and the first positioning support can provide support for the worm and worm gear assembly, and the first worm and the first worm gear can respectively rotate relative to the first positioning support).

[0048] As shown in the figure, the two first positioning units are arranged parallel to each other, and the two second driving units are arranged parallel to each other; the two second driving units are evenly distributed between the two first positioning units, that is, the first positioning unit, the second driving unit, the second driving unit, and the first positioning unit are arranged in sequence.

[0049] The first positioning unit close to the driving motor is denoted as the first positioning unit on the near-motor side, and the first positioning unit far from the driving motor is denoted as the first positioning unit on the far-motor side. The output shaft of the driving motor, the first worm of the first positioning unit on the near-motor side, the linkage shaft, and the first worm of the first positioning unit on the far-motor side are connected in sequence, and the driving motor can drive the first worm of the first positioning unit on the near-motor side and the first worm of the first positioning unit on the far-motor side to rotate synchronously through the linkage shaft. In a specific example, it further includes a motor base; the motor base is connected to the first positioning support of the first positioning unit on the near-motor side, and the first positioning support can provide support for the motor base; the driving motor is connected to the motor base, and the motor base can provide support for the driving motor.

[0050] A first through hole that mates with the first drive lead screw is provided in the suspension beam. The first bearing is disposed within the first through hole, and the first drive lead screw passes through the first through hole. The first drive lead screw is connected to the first bearing, and the first drive lead screw can rotate relative to the first bearing. The first lead screw nut is disposed on the first drive lead screw, and the first lead screw nut can move axially along the first drive lead screw. One end of the first drive lead screw is connected to the first worm gear, and the first worm gear can drive the first drive lead screw to rotate synchronously. A first baffle is disposed at the other end of the first drive lead screw, and the first baffle can limit the position of the first lead screw nut.

[0051] One end of the first fixed cylinder is connected to the suspension beam. The other end of the first fixed cylinder is sleeved with the first movable cylinder, and the first movable cylinder can move axially relative to the first fixed cylinder. The other end of the first movable cylinder is connected to the working cross beam. The first movable cylinder and the first fixed cylinder form a first telescopic assembly, and the working cross beam can move relative to the suspension beam through the first telescopic assembly. In this application, the first movable cylinder and the first fixed cylinder are respectively straight cylinders, effectively ensuring the displacement value. In a specific example, the cross-section of the first movable cylinder along its axial direction and the cross-section of the first fixed cylinder along its axial direction are respectively circular. The inner diameter of the first fixed cylinder is slightly larger than the outer diameter of the first movable cylinder, so that the first movable cylinder can be sleeved inside the first fixed cylinder.

[0052] The first drive lead screw is located inside the first movable cylinder, and the first movable cylinder can move along the axial direction of the first drive lead screw; the first movable cylinder is located inside the first fixed cylinder. A first inner guiding through hole is provided along the axial direction on the first movable cylinder, and a first outer guiding through hole that cooperates with the first inner guiding through hole is provided along the axial direction on the first fixed cylinder. The first contact switch seat is connected to the first lead screw nut, and the first lead screw nut can drive the first contact switch seat to move synchronously; the first contact switch seat sequentially passes through the first inner guiding through hole and the first outer guiding through hole, and the first inner guiding through hole and the first outer guiding through hole can respectively limit the first contact switch seat; the first travel switch is connected to the first contact switch seat, and the first contact switch seat can provide support for the first travel switch. At the same time, the first guiding member is connected to the first movable cylinder, and the first movable cylinder can drive the first guiding member to move synchronously; the first guiding member passes through the first outer guiding through hole; the first guiding member can move relative to the first outer guiding through hole along the axial direction of the first movable cylinder, and the first guiding member can contact the first travel switch and trigger the first travel switch. In a specific example, the first inner guiding through hole and the first outer guiding through hole are respectively strip-shaped holes. Further, the first positioning unit further includes a first counter that cooperates with the first worm gear, and the first counter can count the rotation of the first worm gear. In a specific example, the first counter is a five-digit mechanical counter, and the first counter is used to count the rotation of the first worm gear in the first positioning unit on the far motor side. In this application, the first guiding member and the first contact switch seat are on the same vertical line to ensure that after the second driving oil cylinder is ejected to the set value, the first travel switch can contact the first guiding member and trigger the first travel switch.

[0053] The second driving unit includes a second driving oil cylinder, a second oil cylinder ear seat, and a second connecting member. Among them, the second driving oil cylinder is connected to the suspension beam, and the suspension beam can provide support for the second driving oil cylinder. The second connecting member is connected to the working cross beam, and the working cross beam can provide support for the second connecting member; the second driving oil cylinder, the second oil cylinder ear seat, and the second connecting member are sequentially connected, and the second driving oil cylinder can drive the suspension beam to move synchronously through the second oil cylinder ear seat and the second connecting member in sequence.

[0054] Both ends of the linkage shaft are respectively connected to two first worm gears, thereby realizing the linkage of the two first positioning units; during assembly, the first lead screw nut on the first worm gear in the first positioning unit on the near motor side and the first lead screw nut on the first worm gear in the first positioning unit on the far motor side should be rotated to the same position before the linkage shaft can be installed; at the same time, when the working cross beam is installed later, the second driving oil cylinder needs to be fully retracted to ensure that during use, when the two first drive lead screws drive the motors to rotate and drive, the up and down displacements on the left and right sides are the same, and further ensure that during the ejection process of the second driving oil cylinder, the movement displacements of the first movable cylinders on the left and right are the same.

[0055] The third adaptive unit includes at least two third adaptive components. In this application, within the width range of the working crossbeam, several third adaptive components are evenly distributed. The third adaptive component includes a third linear member, a third T-shaped rotating member, a first rotating connecting member, a second rotating connecting member, a third rotating connecting member, a first fixed connecting member, a second fixed connecting member, and a third flexible plate for cooperating with the wall plate of the flexible nozzle section of the wind tunnel. As shown in the figure, the third T-shaped rotating member is composed of a first horizontal connecting portion and a first vertical connecting portion. The first horizontal connecting portion and the first vertical connecting portion are connected as a whole and arranged in an inverted T shape. The first horizontal connecting portion of the third T-shaped rotating member is arranged with unequal arms. One end of the third linear member is connected to the working crossbeam, and the working crossbeam can drive the third linear member to move synchronously; the other end of the third linear member is hinged to the first vertical connecting portion, and the third T-shaped rotating member can rotate relative to the third linear member through the first vertical connecting portion. In a specific example, the side of the first horizontal connecting portion close to the suspension beam is arc-shaped.

[0056] The short arm on the first horizontal connecting portion is denoted as the first horizontal connecting arm, and the long arm on the first horizontal connecting portion is denoted as the second horizontal connecting arm. The first fixed connecting member is connected to the third flexible plate. One end of the first rotating connecting member is hinged to the first horizontal connecting arm, and the other end of the first rotating connecting member is hinged to the first fixed connecting member. As shown in the figure, the first fixed connecting member is in the shape of a quasi-right triangle. The second fixed connecting member is connected to the third flexible plate; one end of the second rotating connecting member is hinged to the second horizontal connecting arm, and the other end of the second rotating connecting member is hinged to the second fixed connecting member; one end of the third rotating connecting member is hinged to the second horizontal connecting arm, and the other end of the third rotating connecting member is hinged to the second fixed connecting member; the second rotating connecting member is located between the first rotating connecting member and the third rotating connecting member, and the central axis of the third rotating connecting member is inclined relative to the central axis of the second rotating connecting member. Further, the central axis of the first rotating connecting member is parallel to the central axis of the second rotating connecting member. In this application, the third adaptive component can perform rotational motion within a set range, which better ensures the support accuracy and support strength at this point.

[0057] Further, the drive motor, the first travel switch, and the second drive cylinder are respectively connected to the control system. In a specific example, a single third adaptive unit is composed of 5 third adaptive components.

[0058] With this structure, the first positioning support is supported by the suspension beam, the worm and worm gear assembly is supported by the first positioning support, the first worm and the first worm gear can rotate relative to the first positioning support, and the two first worms are linked by a linkage shaft; the output shaft of the drive motor drives the first transmission lead screw to rotate through the first worm and the first worm gear in sequence; under the limiting action of the first contact switch seat and the first inner guiding through hole and the first outer guiding through hole, the first lead screw nut, the first contact switch seat connected to the first lead screw nut, and the first travel switch can move synchronously along the axial direction of the first transmission lead screw; the first travel switch is moved to the set position through the first transmission lead screw, thereby completing the initial positioning of the profile adjustment. The second drive oil cylinder is supported by the suspension beam, and the second drive oil cylinder drives the suspension beam to move synchronously through the second oil cylinder ear seat and the second connecting member in sequence; the first movable cylinder can move relative to the first fixed cylinder, the first movable cylinder is connected to the working cross beam, and the cooperation between the first movable cylinder and the first fixed cylinder can limit the working cross beam; the second drive oil cylinder drives the working cross beam to the set position.

[0059] Further, the second drive unit further includes a second retaining ring and a second pin shaft, and the second oil cylinder ear seat and the second connecting member are connected by the second retaining ring and the second pin shaft; the first movable cylinder includes a first section of the movable cylinder and a second section of the movable cylinder, and the first section of the movable cylinder and the second section of the movable cylinder are connected as a whole to form the first movable cylinder. In this application, the segmented design is adopted, which is beneficial to simplifying the corresponding structure and ensuring the accuracy and reliability of the regulation.

[0060] Further, this embodiment provides an adjustment method for the foregoing profile adjustment mechanism, including the following steps.

[0061] (1) Set the profile adjustment mechanism on the back of the wall plate of the flexible nozzle section of the wind tunnel, and make the third flexure plate contact the back of the wall plate of the flexible nozzle section of the wind tunnel.

[0062] (2) In the initial state, the second drive oil cylinder is in a contracted state.

[0063] (3) When the wall plate of the flexible nozzle section of the wind tunnel needs to be bent, the control system issues an instruction to the drive motor to make the drive motor rotate; the drive motor can drive the first worm of the first positioning unit near the motor side and the first worm of the first positioning unit far from the motor side to rotate synchronously through the linkage shaft; due to the existence of the linkage shaft, the number of rotation circles of the first worm gears at both ends of the linkage shaft is the same; through the first counter, the rotation of the first worm gear in the first positioning unit far from the motor side is counted to ensure that the number of rotation circles of the two first worm gears is the same, and then the rotation of the first transmission lead screw is accurately controlled.

[0064] (4) The first driving lead screw drives the first lead screw nut thereon to rotate. Based on the existence of the first contact switch seat and the mutual cooperation between the first contact switch seat, the first inner guiding through hole, and the first outer guiding through hole, after the first driving lead screw rotates to a set number of turns, the first lead screw nut moves axially along the first driving lead screw to a set position under the action of the first contact switch seat.

[0065] (5) The control system issues a working instruction to the second driving oil cylinder to make the telescopic rod of the second driving oil cylinder extend; during the process of the telescopic rod of the second driving oil cylinder telescoping, the third adaptive unit frequently changes its posture to ensure that the jacking force of the second driving oil cylinder adapts to the bending change process of the wall plate of the flexible nozzle section of the wind tunnel and prevent the wall plate from being damaged; during the process of the second driving oil cylinder driving the working crossbeam to jack up, the working crossbeam drives the first movable cylinder to move synchronously; the first movable cylinder is connected to the first guiding member, and the first movable cylinder can drive the first guiding member to move synchronously.

[0066] (6) When the first guiding member touches the first contact switch seat, the first travel switch is triggered; the first travel switch sends the touch signal to the control system. After receiving the touch signal, the control system issues an instruction to the second driving oil cylinder to make the second driving oil cylinder stop moving; at this time, the position of the profile is accurately adjusted.

[0067] (7) When it is necessary to return to the initial position, the control system issues a working instruction to the second driving oil cylinder to make the telescopic rod of the second driving oil cylinder contract until the telescopic rod of the second driving oil cylinder returns to the initial position; then, the control system issues an instruction to the driving motor to make the driving motor rotate in the reverse direction until the first lead screw nut returns to the initial position.

[0068] When the profile adjusting mechanism is installed, in a specific example, its operation is as follows: (a) By setting the number of turns of the driving motor to reach the position that needs to be jacked out; (b) Automatically record the number of turns of rotation through a five - digit mechanical counter; (c) During the rotation of the driving motor, driven by the linkage shaft, the first driving lead screws in the two first positioning units rotate together to ensure that the number of turns of rotation of the two first driving lead screws is the same. The number of turns of rotation of the first driving lead screw is precisely controlled by an absolute encoder (i.e., a five - digit mechanical counter); (d) The first driving lead screw drives the first lead screw nut thereon to rotate. Based on the existence of the first contact switch seat and the mutual cooperation between the first contact switch seat, the first inner guiding through hole, and the first outer guiding through hole, after the first driving lead screw rotates to a set number of turns, the first lead screw nut moves axially along the first driving lead screw to a set position under the action of the first contact switch seat; (e)The control system issues a working instruction to the second driving oil cylinders, causing the telescopic rods of the two second driving oil cylinders to extend simultaneously; during the process of the telescopic rods of the second driving oil cylinders extending and retracting, the third adaptive unit frequently changes its posture to ensure that the jacking force of the second driving oil cylinders adapts to the bending change process of the wall panel of the flexible nozzle section of the wind tunnel, preventing damage to the wall panel; during the process of the second driving oil cylinders driving the working crossbeam to jack up, the working crossbeam drives the first movable cylinder to move synchronously; the first movable cylinder is connected to the first guiding member, and the first movable cylinder can drive the first guiding member to move synchronously. (f)When the first guiding member touches the first contact switch seat, the first travel switch is triggered; the first travel switch sends the touch signal to the control system, and after receiving the touch signal, the control system issues an instruction to the second driving oil cylinders to stop their movement; at this time, the position of the profile at this place is accurately adjusted.

[0069] In the actual application process, using this adjustment mechanism can accurately adjust the wall panel profile of the flexible nozzle section of the wind tunnel, thus meeting the requirements of precise and controllable adjustment. By adopting the adjustment method of the present application, the entire profile curve can be accurately controlled.

[0070] The present invention is not limited to the foregoing specific embodiments. The present invention extends to any new feature or any new combination disclosed in this specification, as well as any new method or process step or any new combination disclosed.

Claims

1. A profile adjustment mechanism for a large wind tunnel, characterized in that It includes a suspension beam, a driving motor, a linkage shaft, a first positioning unit, a working cross beam, a second driving unit, a third adaptive unit, and a control system for connecting to a wind tunnel; The first positioning unit includes a first positioning support, a first worm, a first worm gear, a first bearing, a first transmission lead screw, a first lead screw nut mating with the first transmission lead screw, a first baffle, a first contact switch base, a first fixed cylinder, a first movable cylinder, a first travel switch, and a first guide; The first positioning support is connected to the suspension beam and the suspension beam can provide support for the first positioning support. The first worm and the first worm gear are respectively arranged in the first positioning support and the first worm and the first worm gear can respectively rotate relative to the first positioning support. The first worm meshes with the first worm gear and the first worm can drive the first worm gear to rotate; There are two first positioning units and two second driving units respectively. The two first positioning units are arranged in parallel. The first positioning unit close to the driving motor is denoted as the first positioning unit on the near-motor side, and the first positioning unit far from the driving motor is denoted as the first positioning unit on the far-motor side; The output shaft of the driving motor, the first worm of the first positioning unit on the near-motor side, the linkage shaft, and the first worm of the first positioning unit on the far-motor side are connected in sequence, and the driving motor can drive the first worm of the first positioning unit on the near-motor side and the first worm of the first positioning unit on the far-motor side to rotate synchronously through the linkage shaft; A first through hole mating with the first transmission lead screw is arranged in the suspension beam. The first bearing is arranged in the first through hole. The first transmission lead screw passes through the first through hole. The first transmission lead screw is connected to the first bearing and the first transmission lead screw can rotate relative to the first bearing. The first lead screw nut is arranged on the first transmission lead screw and the first lead screw nut can move along the axial direction of the first transmission lead screw; One end of the first transmission lead screw is connected to the first worm gear and the first worm gear can drive the first transmission lead screw to rotate synchronously. The first baffle is arranged at the other end of the first transmission lead screw and the first baffle can limit the first lead screw nut; One end of the first fixed cylinder is connected to the suspension beam. The other end of the first fixed cylinder is sleeved with the first movable cylinder and the first movable cylinder can move axially relative to the first fixed cylinder. The other end of the first movable cylinder is connected to the working cross beam. The first movable cylinder and the first fixed cylinder form a first telescopic assembly and the working cross beam can move relative to the suspension beam through the first telescopic assembly; The first transmission lead screw is located inside the first movable cylinder and the first movable cylinder can move along the axial direction of the first transmission lead screw. The first movable cylinder is located inside the first fixed cylinder. A first inner guiding through hole is arranged axially on the first movable cylinder, and a first outer guiding through hole mating with the first inner guiding through hole is arranged axially on the first fixed cylinder; The first contact switch base is connected to the first lead screw nut, and the first lead screw nut can drive the first contact switch base to move synchronously. The first contact switch base sequentially passes through the first inner guiding through hole and the first outer guiding through hole, and the first inner guiding through hole and the first outer guiding through hole can respectively limit the first contact switch base. The first travel switch is connected to the first contact switch base, and the first contact switch base can provide support for the first travel switch; The first guiding member is connected to the first movable cylinder, and the first movable cylinder can drive the first guiding member to move synchronously. The first guiding member passes through the first outer guiding through hole. The first guiding member can move relative to the first outer guiding through hole along the axial direction of the first movable cylinder, and the first guiding member can contact and trigger the first travel switch; The two second driving units are arranged in parallel. The second driving unit includes a second driving oil cylinder, a second oil cylinder ear seat, and a second connecting member. The second driving oil cylinder is connected to the suspension beam, and the suspension beam can provide support for the second driving oil cylinder. The second connecting member is connected to the working cross beam, and the working cross beam can provide support for the second connecting member. The second driving oil cylinder, the second oil cylinder ear seat, and the second connecting member are sequentially connected, and the second driving oil cylinder can drive the suspension beam to move synchronously through the second oil cylinder ear seat and the second connecting member in sequence; The third adaptive unit includes at least two third adaptive components. The third adaptive component includes a third linear member, a third T-shaped rotating member, a rotating connecting member one, a rotating connecting member two, a rotating connecting member three, a fixed connecting member one, a fixed connecting member two, and a third flexible plate for cooperating with the wall plate of the flexible nozzle section of the wind tunnel; The third T-shaped rotating member is composed of a horizontal connecting portion one and a vertical connecting portion one. The horizontal connecting portion one and the vertical connecting portion one are connected as a whole and are arranged in an inverted T shape. The horizontal connecting portion one of the third T-shaped rotating member adopts a non-equal-arm arrangement. One end of the third linear member is connected to the working cross beam, and the working cross beam can drive the third linear member to move synchronously. The other end of the third linear member is hinged to the vertical connecting portion one, and the third T-shaped rotating member can rotate relative to the third linear member through the vertical connecting portion one; The short arm on the horizontal connecting portion one is denoted as the horizontal connecting arm one, and the long arm on the horizontal connecting portion one is denoted as the horizontal connecting arm two; The fixed connecting member one is connected to the third flexible plate. One end of the rotating connecting member one is hinged to the horizontal connecting arm one, and the other end of the rotating connecting member one is hinged to the fixed connecting member one; The fixed connecting member two is connected to the third flexible plate. One end of the rotating connecting member two is hinged to the horizontal connecting arm two, and the other end of the rotating connecting member two is hinged to the fixed connecting member two. One end of the rotating connecting member three is hinged to the horizontal connecting arm two, and the other end of the rotating connecting member three is hinged to the fixed connecting member two. The rotating connecting member two is located between the rotating connecting member one and the rotating connecting member three, and the central axis of the rotating connecting member three is inclined relative to the central axis of the rotating connecting member two; The driving motor, the first travel switch, and the second driving oil cylinder are respectively connected to the control system.

2. The profiled surface adjusting mechanism according to claim 1, wherein It further includes a motor base, the motor base is connected to the first positioning support of the first positioning unit on the side near the motor, and the first positioning support can provide support for the motor base. The driving motor is connected to the motor base, and the motor base can provide support for the driving motor.

3. The profile adjusting mechanism according to claim 1, characterized in that, The cross-section of the first movable cylinder along its axial direction is circular or polygonal, and the cross-section of the first fixed cylinder along its axial direction is circular or polygonal.

4. The profile adjusting mechanism according to claim 3, characterized in that, The cross-section of the first movable cylinder along its axial direction and the cross-section of the first fixed cylinder along its axial direction are respectively circular, and the inner diameter of the first fixed cylinder is greater than the outer diameter of the first movable cylinder.

5. The profiled surface adjusting mechanism according to claim 1, characterized in that, The first inner guiding through hole and the first outer guiding through hole are respectively strip-shaped holes.

6. The profile adjusting mechanism according to claim 1, wherein The first positioning unit further includes a first counter that cooperates with the first worm gear, and the first counter can count the rotation of the first worm gear.

7. The profile adjusting mechanism according to claim 6, characterized in that, The first counter is connected to the control system, and the first counter can transmit the measured information to the control system.

8. The profiled surface adjusting mechanism according to claim 6, characterized in that, There is one first counter, and the first counter is used to count the rotation of the first worm gear in the first positioning unit on the side far from the motor; or there are two first counters, and the two first counters can respectively count the rotation of the two first worm gears.

9. The profiled surface adjusting mechanism according to claim 1, characterized in that, The first movable cylinder includes a first section of the movable cylinder and a second section of the movable cylinder. The first section of the movable cylinder and the second section of the movable cylinder are connected as a whole to form the first movable cylinder.

10. The profiled surface adjusting mechanism according to claim 1, characterized in that, The central axis of the first rotating connecting piece is arranged parallel to the central axis of the second rotating connecting piece.

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