Horizontal cantilever multi-stage telescopic mobile measuring device

Abstract

This invention discloses a horizontal cantilever multi-stage telescopic moving measuring device, relating to the field of wind tunnel flow field calibration technology. It can carry a measuring load along the axial direction of the wind tunnel during flow field calibration. The device employs a single-motor drive system using a rectangular steel pipe profile, multi-stage hollow screws, and heavy-duty linear guides, resulting in a compact overall structure, large effective stroke, good bending resistance, and a large load capacity. An end-effector auxiliary support system automatically compensates for the end-effector center position. During wind tunnel flow field calibration, this device drives the main pressure pipe, probes, and hot-wire anemometers, among other measuring loads, to move along the wind tunnel axial direction, accurately measuring flow field data at different cross-sections. It solves problems such as excessive deflection and low load capacity associated with long cantilever structures, reduces cross-sectional blockage, minimizes interference in flow field measurement data, and improves measurement process quality.

Description

Technical Field

[0001] This invention relates to the field of wind tunnel flow field calibration technology, and in particular to a horizontal cantilever multi-stage telescopic movement measuring device. Background Technology

[0002] The purpose of wind tunnel flow field calibration testing is to verify the performance of the wind tunnel and the testing equipment. After each wind tunnel is built, flow field calibration and standard model tests must be conducted to measure the performance, flow field quality, and accuracy of the test data, verifying whether the various indicators specified in the wind tunnel design document are met. With the development of aircraft development and aerodynamic research, the types of wind tunnel tests are increasing, and the requirements for the accuracy of test results are becoming increasingly stringent. Flow quality is a major factor affecting the accuracy and precision of wind tunnel test data. Therefore, research on related instruments and measuring devices for flow field calibration is particularly important for accurately measuring flow field quality.

[0003] Currently, domestic mobile measurement devices mainly adopt a dual-motor horizontal telescopic cantilever structure, with nitrogen springs at the end for auxiliary support to reduce horizontal deflection. The end carries various measurement loads, and the flow field data of different cross sections are measured by controlling the motor-driven telescopic mechanism.

[0004] However, the existing mobile measuring device uses a passive auxiliary support of nitrogen springs at the end, which can solve the problem of excessive deflection in the cantilever state to some extent, but it does not have an active adjustment function, and the deflection will become uncontrollable under the interference of high-speed wind load. Summary of the Invention

[0005] In view of the above problems, the present invention provides a horizontal cantilever multi-stage telescopic movement measuring device for overcoming or at least partially solving the above problems.

[0006] This invention provides the following solution:

[0007] A horizontal cantilever multi-stage telescopic movement measuring device, comprising:

[0008] A telescopic arm unit, the telescopic arm unit comprising a multi-stage telescopic arm that is connected in cooperation;

[0009] A telescopic drive unit, which is used to drive the multi-stage telescopic arm to perform telescopic movements;

[0010] An auxiliary support unit includes a mounting base, two support arms, and two electric cylinders. One end of the mounting base is fixedly connected to the front end of the last telescopic arm, and one end of each of the two support arms is hinged to the other end of the mounting base. One end of each of the two electric cylinders is hinged to the mounting base, and the other end of each of the two electric cylinders is hinged to the two support arms respectively.

[0011] The end of the mounting base away from the telescopic arm unit is used to install the measuring load; the two electric cylinders are used to adjust the included angle between the two support arms so that the free ends of the two support arms abut against the inner wall of the wind tunnel.

[0012] Preferably, the telescopic arm is made of rectangular steel pipe profile.

[0013] Preferably, the multi-stage telescopic arm includes a first telescopic arm, a second telescopic arm, and a third telescopic arm. The second telescopic arm is connected to the interior of the first telescopic arm via a linear guide rail, and the third telescopic arm is connected to the interior of the second telescopic arm via a linear guide rail. The mounting base is connected to the front end of the third telescopic arm.

[0014] Preferably, the telescopic drive unit includes a drive motor, a first lead screw, a second lead screw, and a third lead screw; the drive motor and the first lead screw are both disposed inside the first telescopic arm, the second lead screw is disposed inside the second telescopic arm, and the third lead screw is disposed inside the third telescopic arm; the first lead screw is connected to the drive motor and the second lead screw respectively, and the second lead screw is connected to the third lead screw.

[0015] Preferably, each of the two support arms has a contact roller at its free end.

[0016] Preferably, the electric cylinder has a built-in tilt sensor.

[0017] Preferably, the system further includes a central partition and a central support, both of which are fitted onto the outside of the telescopic boom unit and connected to it; the central partition and the central support are used to connect to the wind tunnel support section.

[0018] According to specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0019] This application provides a horizontal cantilever multi-stage telescopic mobile measuring device that can carry a measuring load along the axial direction of a wind tunnel during flow field calibration. The device employs a single-motor drive system using rectangular steel pipe profiles, multi-stage hollow screws, and heavy-duty linear guides. This results in a compact overall structure, a large effective stroke, good bending resistance, and the ability to carry a large load. An end-effector auxiliary support system automatically compensates for the end-effector center position. During wind tunnel flow field calibration, this device drives the total pressure manifold, probes, and hot-wire anemometers to move along the wind tunnel axial direction, accurately measuring flow field data at different cross-sections. It solves problems such as excessive deflection and low load capacity associated with long cantilever structures, reduces cross-sectional blockage, minimizes interference in flow field measurement data, and improves measurement process quality.

[0020] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of a horizontal cantilever multi-stage telescopic moving measurement device provided in an embodiment of the present invention.

[0023] In the figure: First telescopic arm 11, second telescopic arm 12, third telescopic arm 13, drive motor 21, first lead screw 22, second lead screw 23, third lead screw 24, mounting base 31, support arm 32, electric cylinder 33, contact roller 34, middle partition 41, middle bracket 42. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0025] See Figure 1 This invention provides a horizontal cantilever multi-stage telescopic movement measuring device, such as... Figure 1 As shown, the device may include:

[0026] The telescopic arm unit includes a multi-stage telescopic arm that is connected in a cooperative manner; in a specific implementation, the telescopic arm can be made of rectangular steel pipe profile.

[0027] A telescopic drive unit, which is used to drive the multi-stage telescopic arm to perform telescopic movements;

[0028] An auxiliary support unit includes a mounting base 31, two support arms 32, and two electric cylinders 33. One end of the mounting base 31 is fixedly connected to the front end of the last telescopic arm, and one end of each of the two support arms 32 is hinged to the other end of the mounting base 31. One end of each of the two electric cylinders 33 is hinged to the mounting base 31, and the other end of each of the two electric cylinders 33 is hinged to the two support arms 32 respectively.

[0029] The mounting base 31 is used to install the measuring load at the end away from the telescopic arm unit; the two electric cylinders 33 are used to adjust the included angle between the two support arms 32 so that the free ends of the two support arms 32 abut against the inner wall of the wind tunnel.

[0030] The horizontal cantilever multi-stage telescopic mobile measuring device provided in this application embodiment can carry the measuring load and move along the axial direction of the wind tunnel during wind tunnel flow field calibration. The device adopts a single-motor drive method using rectangular steel pipe profiles, multi-stage hollow screws, and heavy-duty linear guides, resulting in a compact overall structure, large effective stroke, good bending resistance, and the ability to carry large loads. The use of an end-effector electric cylinder for auxiliary support automatically compensates for the end-effector center position.

[0031] To improve the telescopic range of the device, embodiments of this application may provide a multi-stage telescopic arm including a first telescopic arm 11, a second telescopic arm 12, and a third telescopic arm 13. The second telescopic arm 12 is connected to the interior of the first telescopic arm 11 via a linear guide rail, and the third telescopic arm 13 is connected to the interior of the second telescopic arm 12 via a linear guide rail. The mounting base 31 is connected to the front end of the third telescopic arm 13.

[0032] Furthermore, the telescopic drive unit includes a drive motor 21, a first lead screw 22, a second lead screw 23, and a third lead screw 24; the drive motor 21 and the first lead screw 22 are both disposed inside the first telescopic arm 11, the second lead screw 23 is disposed inside the second telescopic arm 12, and the third lead screw 24 is disposed inside the third telescopic arm 13; the first lead screw 22 is connected to the drive motor 21 and the second lead screw 23 respectively, and the second lead screw 23 is connected to the third lead screw 24.

[0033] To further prevent damage to the inner wall of the wind tunnel when the two support arms 32 are adjusted at their angles or when they come into contact with the inner wall of the wind tunnel, embodiments of this application may provide contact rollers 34 at the free ends of the two support arms 32 respectively.

[0034] In order to know the angle of each of the two support arms 32 in real time, this embodiment of the application may also provide that the electric cylinder 33 is equipped with an inclination sensor.

[0035] To facilitate connection with the support structure inside the wind tunnel, this embodiment of the application may also provide a central partition 41 and a central support 42. The central partition 41 and the central support 42 are both fitted onto the outside of the telescopic arm unit and connected to the telescopic arm unit; the central partition 41 and the central support 42 are used to connect to the wind tunnel support section.

[0036] The apparatus provided in this application will now be described in detail.

[0037] The device provided in this application mainly includes: a central partition 41, a central support 42, a telescopic drive unit, a first telescopic arm 11, a second telescopic arm 12, a third telescopic arm 13, and an auxiliary support unit.

[0038] The connection relationship is as follows: the middle partition plate 41 and the middle support 42 are mainly installed on the wind tunnel support section, the first telescopic arm 11 is fixed on the middle support 42; the motor and the first lead screw 22 of the telescopic drive unit are fixed on the first telescopic arm 11, the second lead screw of the telescopic drive unit is fixed on the second telescopic arm 12, and the third lead screw telescopic drive unit is fixed on the third telescopic arm 13; the second telescopic arm 12 is fixed on the first telescopic arm 11 through a linear guide rail; the third telescopic arm 13 is fixed on the second telescopic arm 12 through a linear guide rail; the auxiliary support unit is fixed on the third telescopic arm 13 by screws.

[0039] The telescopic arms are all made of rectangular hollow steel profiles, giving each arm better resistance to deformation. The second lead screw 23 and the third lead screw 24 both adopt a hollow lead screw structure, allowing one drive motor 21 to drive all three telescopic arms to extend and retract simultaneously, thereby reducing the overall size of the device.

[0040] In use, the device is first installed on the wind tunnel support section via the partition plate 41 and the central support 42. Then, the measuring load is installed at the front end of the mounting base 31. The extension and retraction of the electric cylinder are controlled by rotating the motor in the telescopic drive unit. Because the wind tunnel has a gradually changing inner diameter, after the telescopic arm unit moves to the designated position carrying the measuring load, the upper and lower electric cylinders of the auxiliary support unit adjust the end-center position based on feedback from the built-in tilt sensor. The angle between the two support arms 32 is adjusted by two electric rods, ensuring that the free ends of both support arms 32 abut against the inner wall of the wind tunnel. The two support arms 32 provide auxiliary support for the measuring load, ensuring that even under strong winds during testing, the telescopic arm unit remains centered in the wind tunnel, preventing disruptive deformation and improving measurement accuracy.

[0041] Compared to the traditional passive auxiliary support method using nitrogen springs, this embodiment uses two electric cylinders 33 to actively adjust the support arm 32. After adjustment, the electric cylinders 33 can form a stable support structure, and the nitrogen spring will not be compressed as the wind speed increases, causing the support arm 32 to separate from the inner wall of the wind tunnel and resulting in the measurement load shaking.

[0042] Meanwhile, the traditional nitrogen spring passive support method will cause obvious swaying when the air volume changes, which will damage the inner wall of the wind tunnel during use. However, the device provided in this application uses a stable electric cylinder 33 for support, and there will be no swaying phenomenon when the wind speed changes, so it will not damage the inner wall of the wind tunnel.

[0043] Furthermore, using nitrogen springs as auxiliary supports presents challenges. During the axial movement of the load along the wind tunnel, the supporting force of the nitrogen springs increases as the wind tunnel's inner diameter decreases. Therefore, the movement from the larger inner diameter section to the smaller inner diameter section of the wind tunnel is always in a state similar to an interference fit, making it easy for the free ends of the support arms 32 to scratch the inner wall of the wind tunnel. The device provided in this application, when measuring the load and needing to move it from the larger diameter section to the smaller diameter section, can first adjust the angle between the two support arms 32 using the electric cylinder 33 to decrease the distance between the free ends of the two support arms 32 to be less than the inner diameter of the wind tunnel at the specified position. Once the specified position is reached, the electric cylinder 33 can then increase the angle between the two support arms 32, ensuring that the free ends of the two support arms 32 contact the inner wall of the wind tunnel, thus preventing scratches on the inner wall of the wind tunnel during movement.

[0044] In summary, the horizontal cantilever multi-stage telescopic moving measurement device provided in this application is used to drive the measurement loads such as the total pressure pipe, probe and hot wire anemometer to move along the wind tunnel axis during wind tunnel flow field calibration, accurately measuring flow field data at different cross sections. It solves the problems of excessive deflection and low load of long cantilever, reduces the blockage of the cross section, makes the flow field measurement data less interfered with, and is more conducive to the quality of the measurement process.

[0045] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0046] As can be seen from the above description of the embodiments, those skilled in the art can clearly understand that this application can be implemented by means of software plus necessary general-purpose hardware platforms. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in various embodiments or some parts of the embodiments of this application.

[0047] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for system or system embodiments, since they are basically similar to method embodiments, the description is relatively simple, and relevant parts can be referred to the descriptions in the method embodiments. The systems and system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0048] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of protection of the present invention.

Claims

1. A horizontal cantilever multi-stage telescopic moving measuring device, characterized in that, include: A telescopic arm unit, the telescopic arm unit comprising a multi-stage telescopic arm that is connected in cooperation; A telescopic drive unit, which is used to drive the multi-stage telescopic arm to perform telescopic movements; An auxiliary support unit includes a mounting base, two support arms, and two electric cylinders. One end of the mounting base is fixedly connected to the front end of the last telescopic arm, and one end of each of the two support arms is hinged to the other end of the mounting base. One end of each of the two electric cylinders is hinged to the mounting base, and the other end of each of the two electric cylinders is hinged to the two support arms respectively. The mounting base, located away from the telescopic arm unit, is used to mount the measuring load; the two electric cylinders are used to adjust the angle between the two support arms, so that the free ends of each support arm abut against the inner wall of the wind tunnel; The multi-stage telescopic boom includes a first telescopic boom, a second telescopic boom, and a third telescopic boom. The second telescopic boom is connected to the interior of the first telescopic boom via a linear guide rail, and the third telescopic boom is connected to the interior of the second telescopic boom via a linear guide rail. The mounting base is connected to the front end of the third telescopic boom. The telescopic drive unit includes a drive motor, a first lead screw, a second lead screw, and a third lead screw; the drive motor and the first lead screw are both disposed inside the first telescopic arm, the second lead screw is disposed inside the second telescopic arm, and the third lead screw is disposed inside the third telescopic arm; the first lead screw is connected to the drive motor and the second lead screw respectively, and the second lead screw is connected to the third lead screw.

2. The horizontal cantilever multi-stage telescopic movement measuring device according to claim 1, characterized in that, The telescopic arm is made of rectangular steel pipe profile.

3. The horizontal cantilever multi-stage telescopic movement measuring device according to claim 1, characterized in that, Each of the two support arms is provided with a contact roller at its free end.

4. The horizontal cantilever multi-stage telescopic movement measuring device according to claim 1, characterized in that, The electric cylinder has a built-in tilt sensor.

5. The horizontal cantilever multi-stage telescopic movement measuring device according to claim 1, characterized in that, It also includes a central partition and a central support, both of which are fitted onto the outside of the telescopic boom unit and connected to the telescopic boom unit; the central partition and the central support are used to connect to the wind tunnel support section.

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