Horizontal cantilever multi-stage telescopic mobile measuring device

Abstract

The invention discloses a horizontal cantilever multistage telescopic mobile measuring device, which relates to the technical field of wind tunnel flow field calibration, can carry a measuring load to move along the axial direction of a wind tunnel during wind tunnel flow field calibration, and adopts a single motor driving mode of a rectangular steel tube section bar, a multistage hollow lead screw and a heavy linear guide rail. The whole structure of the device is compact, the effective stroke is large, the bending resistance is good, and the carrying load is large. A tail end electric cylinder auxiliary supporting mode is adopted, and the center position of the tail end can be automatically compensated. The device is used for driving measurement loads such as a total pressure calandria, a probe and a hot-wire anemometer to move in the axial direction of a wind tunnel during wind tunnel flow field calibration, flow field data of different cross sections are accurately measured, the problems of overlarge deflection and low load of a long cantilever are solved, the blockage degree of the cross sections is reduced, the interference of the flow field measurement data is smaller, and the measurement accuracy is improved. And the measurement process quality is facilitated.

Description

Technical Field

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

[0002] The purpose of wind tunnel flow field calibration test is to test the performance of wind tunnel and test equipment. After each wind tunnel is built, flow field calibration and standard model test must be carried out to measure the performance of the new wind tunnel, the quality of flow field and the accuracy of test data, and to check whether the various indicators specified in the wind tunnel design task book are met. With the development of aircraft development and aerodynamic research, there are more and more types of wind tunnel tests, and the requirements for the accuracy of test results are getting higher and higher. Process quality is the main factor affecting the accuracy and precision of wind tunnel test data. In order to accurately measure the quality of the flow field, the research on related instruments and measuring devices for process calibration is particularly important.

[0003] At present, domestic mobile measurement devices mainly adopt a horizontal telescopic cantilever structure with dual motors. A nitrogen spring is used as an auxiliary support at the end to reduce the horizontal deflection. The end carries various measurement loads and measures flow field data of different cross sections by controlling the motor-driven telescopic mechanism.

[0004] However, the existing mobile measuring device uses a passive auxiliary support of a nitrogen spring at the end. Although it can solve the problem of excessive deflection in the cantilever state to a certain extent, it does not have an active adjustment function and the deflection may be uncontrollable under the interference of high-speed wind loads. 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 the above problems or at least partially solving the above problems.

[0006] The present invention provides the following scheme:

[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 connected in a cooperative manner;

[0009] A telescopic drive unit, the telescopic drive unit is used to drive the multi-stage telescopic arms to perform telescoping;

[0010] An auxiliary support unit, the auxiliary support unit comprises a mounting seat, two support arms and two electric cylinders; one end of the mounting seat is fixedly connected to the front end of the telescopic arm of the last stage, and one end of each of the two support arms is hinged to the other end of the mounting seat; one end of each of the two electric cylinders is hinged to the mounting seat, and the other end of each of the two electric cylinders is hinged to the two support arms in a one-to-one correspondence;

[0011] Among them, the end of the mounting seat away from the telescopic arm unit is used to install the measuring load; the two electric cylinders are used to adjust the angle between the two support arms so that the free ends of the two support arms are in contact with the inner wall of the wind tunnel.

[0012] Preferably, the telescopic arm is made of a rectangular steel tube 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 through a linear guide rail, and the third telescopic arm is connected to the interior of the second telescopic arm through a linear guide rail; the mounting seat 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 arranged inside the first telescopic arm, the second lead screw is arranged inside the second telescopic arm, and the third lead screw is arranged inside the third telescopic arm; the first lead screw is respectively connected to the drive motor and the second lead screw, and the second lead screw is connected to the third lead screw.

[0015] Preferably: a contact roller is provided at each free end of the two support arms.

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

[0017] Preferably: it also includes a middle partition and a middle bracket, both of which are mounted on the outside of the telescopic arm unit and connected to the telescopic arm unit; the middle partition and the middle bracket are used to be connected to the wind tunnel bracket section.

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

[0019] A horizontal cantilever multi-stage telescopic mobile measuring device provided in an embodiment of the present application can carry the measuring load and move along the axial direction of the wind tunnel during the calibration of the wind tunnel flow field. The device adopts a single motor drive method of rectangular steel pipe profile + multi-stage hollow screw + heavy-duty linear guide rail, which can make the overall structure of the device compact, with a large effective stroke, good bending resistance, and can also carry a large load. The end electric cylinder auxiliary support method is adopted to automatically compensate for the end center position. During the wind tunnel flow field calibration, the device is used to drive the total pressure discharge pipe, probe, hot wire anemometer and other measuring loads to move along the axial direction of the wind tunnel, accurately measure the flow field data of different cross sections, solve the problems of excessive deflection and low load of the long cantilever, reduce the blockage of the cross section, make the flow field measurement data less disturbed, and be more conducive to the measurement process quality.

[0020] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 It is a structural schematic diagram of a horizontal cantilever multi-stage telescopic movement measuring device provided by an embodiment of the present invention.

[0023] In the figure: a first telescopic arm 11, a second telescopic arm 12, a third telescopic arm 13, a drive motor 21, a first lead screw 22, a second lead screw 23, a third lead screw 24, a mounting seat 31, a support arm 32, an electric cylinder 33, a contact roller 34, a middle partition plate 41, and a middle bracket 42. DETAILED DESCRIPTION

[0024] The technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all of the embodiments. Based on the embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0025] See also Figure 1 , a horizontal cantilever multi-stage telescopic movement measuring device provided by an embodiment of the present invention, such as Figure 1 As shown, the device may include:

[0026] A telescopic arm unit, wherein the telescopic arm unit comprises a multi-stage telescopic arm connected in a cooperative manner; in specific implementation, the embodiment of the present application may provide that the material of the telescopic arm is a rectangular steel tube profile.

[0027] A telescopic drive unit, the telescopic drive unit is used to drive the multi-stage telescopic arms to perform telescoping;

[0028] Auxiliary support unit, the auxiliary support unit includes a mounting seat 31, two support arms 32 and two electric cylinders 33; one end of the mounting seat 31 is fixedly connected to the front end of the telescopic arm of the last stage, and one end of each of the two support arms 32 is hinged to the other end of the mounting seat 31; one end of each of the two electric cylinders 33 is hinged to the mounting seat 31, and the other end of each of the two electric cylinders 33 is hinged to the two support arms 32 in a one-to-one correspondence;

[0029] Among them, the end of the mounting seat 31 away from the telescopic arm unit is used to install the measuring load; the two electric cylinders 33 are used to adjust the angle between the two support arms 32 so that the free ends of the two support arms 32 are in contact with the inner wall of the wind tunnel.

[0030] The horizontal cantilever multi-stage telescopic mobile measuring device provided in the embodiment of the present application can carry the measuring load and move along the axial direction of the wind tunnel during the wind tunnel flow field calibration. The device adopts a single motor drive mode of rectangular steel tube profile + multi-stage hollow screw + heavy linear guide rail, which can make the overall structure of the device compact, with a large effective stroke, good bending resistance, and a large load. The end electric cylinder auxiliary support method can automatically compensate for the end center position.

[0031] In order to increase the telescopic range of the device, an embodiment of the present application may provide that the multi-stage telescopic arm includes 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 through a linear guide rail, and the third telescopic arm 13 is connected to the interior of the second telescopic arm 12 through a linear guide rail; the mounting seat 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 arranged inside the first telescopic arm 11, the second lead screw 23 is arranged inside the second telescopic arm 12, and the third lead screw 24 is arranged inside the third telescopic arm 13; the first lead screw 22 is respectively connected to the drive motor 21 and the second lead screw 23, and the second lead screw 23 is connected to the third lead screw 24.

[0033] In order to further prevent the two support arms 32 from causing damage to the inner wall of the wind tunnel when adjusting their angles or contacting the inner wall of the wind tunnel, the embodiment of the present application may provide that the free ends of the two support arms 32 are respectively provided with contact rollers 34 .

[0034] In order to understand the respective angles of the two support arms 32 in real time, the embodiment of the present application may further provide that the electric cylinder 33 has a built-in inclination sensor.

[0035] In order to facilitate the connection with the bracket in the wind tunnel, the embodiment of the present application can also provide a middle partition 41 and a middle bracket 42, and the middle partition 41 and the middle bracket 42 are both mounted on the outside of the telescopic arm unit and connected to the telescopic arm unit; the middle partition 41 and the middle bracket 42 are used to connect to the wind tunnel bracket section.

[0036] The device provided by this application is introduced in detail below.

[0037] The device provided in the present application mainly includes: a middle partition 41, a middle bracket 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 41 and the middle bracket 42 are mainly installed on the wind tunnel bracket section, the first telescopic arm 11 is fixed on the middle bracket 42; the motor and the first screw 22 of the telescopic drive unit are fixed to the first telescopic arm 11, the second screw of the telescopic drive unit is fixed to the second telescopic arm 12, and the third screw of the telescopic drive unit is fixed to the third telescopic arm 13; the second telescopic arm 12 is fixed to the first telescopic arm 11 through a linear guide rail; the third telescopic arm 13 is fixed to the second telescopic arm 12 through a linear guide rail; the auxiliary support unit is fixed to the third telescopic arm 13 by screws.

[0039] The telescopic arms are all made of rectangular hollow steel profiles, so that each telescopic arm has better anti-deformation ability. The second lead screw 23 and the third lead screw 24 are both hollow lead screw structures, so that one drive motor 21 can drive the three telescopic arms to telescope at the same time, thereby reducing the overall volume of the device.

[0040] When the device is in use, first install the device on the wind tunnel support section through the middle partition 41 and the middle support 42, then install the measuring load on the front end of the mounting seat 31, and extend and retract the electric cylinder by controlling the forward and reverse rotation of the motor in the telescopic drive unit. Since the wind tunnel has a structure with a gradually changing inner diameter, after the telescopic arm unit moves to carry the measuring load to the specified position, the upper and lower electric cylinders of the auxiliary support unit adjust the terminal center position according to the built-in inclination sensor data feedback, and adjust the angle between the two support arms 32 through two electric poles, so that the free ends of the two support arms 32 are in contact with the inner wall of the wind tunnel. The two support arms 32 can form auxiliary support for the measuring load, ensuring that during the experimental test, even if the measuring load is subjected to a large wind force, the auxiliary support can effectively prevent the telescopic arm unit from disturbing deformation, and the measuring load can still be kept in the center of the wind tunnel, thereby achieving the purpose of improving the measurement accuracy.

[0041] Compared with the traditional passive auxiliary support method using nitrogen springs, the embodiment of the present application uses two electric cylinders 33 to actively adjust the support arm 32. After the adjustment is completed, the electric cylinder 33 can form a stable support structure. 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 causing the measurement load to shake.

[0042] At the same time, the traditional nitrogen spring passive support method will have obvious swing when the wind volume changes, so it will cause damage to the inner wall of the wind tunnel during use. The device provided in the present application uses a stable electric cylinder 33 for support, and there will be no swing due to changes in wind speed, so it will not cause damage to the inner wall of the wind tunnel.

[0043] In addition, a nitrogen spring is used as an auxiliary support. In the process of moving the load position along the axial direction of the wind tunnel, the support force of the nitrogen spring increases as the inner diameter of the wind tunnel decreases. Therefore, in the process of moving from the large inner diameter section to the small inner diameter section of the wind tunnel, it is always in a state similar to interference fit, so the free end of the support arm 32 is easy to scratch the inner wall of the wind tunnel. When the device provided by the present application needs to move from the large diameter section to the small diameter section when measuring the load, the angle between the two support arms 32 can be adjusted to be smaller through the electric cylinder 33, so that the distance between the free ends of the two support arms 32 is less than the inner diameter of the wind tunnel at the specified position. After reaching the specified position, the angle between the two support arms 32 is increased by the electric cylinder 33, so that the free ends of the two support arms 32 can contact the inner wall of the wind tunnel, thereby ensuring that the inner wall of the wind tunnel will not be scratched during the movement.

[0044] In summary, the horizontal cantilever multi-stage telescopic moving measuring device provided in the present application is used to drive the total pressure discharge pipe, probe, hot wire anemometer and other measuring loads to move along the axial direction of the wind tunnel during wind tunnel flow field calibration, accurately measuring the flow field data of different cross sections, solving the problems of excessive deflection and low load of the long cantilever, reducing the blockage of the cross section, making the flow field measurement data less disturbed, and being more conducive to measuring the process quality.

[0045] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0046] It can be known from the description of the above implementation methods that those skilled in the art can clearly understand that the present application can be implemented by means of software plus a necessary general hardware platform. Based on such an understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product can be stored in a storage medium such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in the various embodiments of the present application or certain parts of the embodiments.

[0047] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can refer to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system or system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can refer to the partial description of the method embodiment. The system and system embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without creative work.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A horizontal cantilever multi-stage telescopic movement measuring device, characterized in that: include: A telescopic arm unit, the telescopic arm unit comprising a multi-stage telescopic arm connected in a cooperative manner; A telescopic drive unit, the telescopic drive unit is used to drive the multi-stage telescopic arms to perform telescoping; An auxiliary support unit, the auxiliary support unit comprises a mounting seat, two support arms and two electric cylinders; one end of the mounting seat is fixedly connected to the front end of the telescopic arm of the last stage, and one end of each of the two support arms is hinged to the other end of the mounting seat; one end of each of the two electric cylinders is hinged to the mounting seat, and the other end of each of the two electric cylinders is hinged to the two support arms in a one-to-one correspondence; Among them, the end of the mounting seat away from the telescopic arm unit is used to install the measuring load; the two electric cylinders are used to adjust the angle between the two support arms so that the free ends of the two support arms are in contact with the inner wall of the wind tunnel.

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

3. The horizontal cantilever multi-stage telescopic movement measuring device according to claim 1 is characterized in that: 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 through a linear guide rail, and the third telescopic arm is connected to the interior of the second telescopic arm through a linear guide rail; the mounting seat is connected to the front end of the third telescopic arm.

4. The horizontal cantilever multi-stage telescopic movement measuring device according to claim 3 is characterized in that: 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 arranged inside the first telescopic arm, the second lead screw is arranged inside the second telescopic arm, and the third lead screw is arranged inside the third telescopic arm; the first lead screw is respectively connected to the drive motor and the second lead screw, and the second lead screw is connected to the third lead screw.

5. The horizontal cantilever multi-stage telescopic movement measuring device according to claim 1 is characterized in that: The free ends of the two support arms are respectively provided with contact rollers.

6. The horizontal cantilever multi-stage telescopic movement measuring device according to claim 1 is characterized in that: The electric cylinder is equipped with a built-in inclination sensor.

7. The horizontal cantilever multi-stage telescopic movement measuring device according to claim 1 is characterized in that: It also includes a middle partition and a middle bracket, which are both mounted on the outside of the telescopic arm unit and connected to the telescopic arm unit; the middle partition and the middle bracket are used to be connected to the wind tunnel bracket section.

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