A structure of connecting a model support to an X-direction mechanism frame by a four-degree-of-freedom mechanism

Abstract

The application discloses a structure of a model support connected with an X mechanism frame of a four-degree-of-freedom mechanism, which comprises an X mechanism and a model support fixed on the X mechanism frame of the X mechanism, and the upper end of the model support supports a model. The structure of the model support connected with the X mechanism frame of the four-degree-of-freedom mechanism has the characteristics of convenient installation, strong bearing capacity, strong anti-seismic capacity, long support platform, multiple support points and support for large models.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of high-speed aerodynamic test equipment, and more particularly, the application relates to a structure for connecting a model support to an X mechanism frame of a four-degree-of-freedom mechanism. BACKGROUND

[0002] A model support mechanism is a core device of a high-speed wind tunnel, which is used to accurately change the position and posture of a model and bear the aerodynamic load borne by the model. A model support mechanism of a certain high-speed jet flow wind tunnel comprises four degrees of freedom, including an angle of attack, a sideslip angle, Y and X directions. Under conventional conditions, a model support is connected to a bent-knife support on an angle-of-attack mechanism, and the model can freely change the position and posture of the mechanism within the operating range of the four-degree-of-freedom mechanism. However, the bearing capacity of the bent-knife support is not high, the taper hole on the bent-knife support is single support, and it is difficult to support large models, especially some super-long and super-large weak models that need multi-point support, which cannot well meet the support requirements of the certain high-speed jet flow. In a conventional high-speed wind tunnel, the core model support mechanism is usually a single angle-of-attack mechanism, and the expansion of the connection mode of the model support is difficult due to the limitation of the space of the connection part, the flow field and other factors, and the expandability is poor. After the four-degree-of-freedom mechanism is equipped in the certain high-speed jet flow wind tunnel, the degrees of freedom are more, the test cabin space is large, and the expandability is great. In order to meet the support requirements, it is necessary to expand the connection mode of the model support. Expanding the connection mode of the model support on the non-bent-knife support of the four-degree-of-freedom mechanism can increase the size and load of the supported model and reduce the number of motion degrees of freedom of the model support. According to the actual requirements, it is necessary to expand a structure for connecting a model support to an X mechanism frame, so as to realize a super-large support platform and support a super-large and super-long model with strong anti-seismic capacity. SUMMARY

[0003] An object of the present application is to solve at least the above problems and / or defects, and to provide at least the advantages to be described later.

[0004] In order to achieve these objects and other advantages according to the present application, a structure for connecting a model support to an X mechanism frame of a four-degree-of-freedom mechanism is provided, comprising:

[0005] an X mechanism;

[0006] a model support fixed to an X mechanism frame of the X mechanism, and an upper end of the model support supporting a model.

[0007] Preferably, the structure of the model support comprises:

[0008] at least three groups of cross beams fixedly installed on the X mechanism frame;

[0009] a support platform fixedly arranged at an upper end of the cross beam;

[0010] A plurality of support columns are fixedly arranged in pairs at the upper end of the support platform.

[0011] Preferably, the support platform is a frame structure, and a connecting plate is fixedly installed between the two longitudinal beams above the support platform, and the support columns are fixed at both ends of the connecting plate.

[0012] Preferably, the cross section of the support column is a blade structure.

[0013] Preferably, the structure of the X mechanism comprises:

[0014] A base is provided with an X mechanism lower crossbeam in a rectangular frame structure at the upper end, two X mechanism frames are fixedly arranged at the upper end of the X mechanism lower crossbeam, and an X mechanism connecting surface is arranged on the upper surface of the X mechanism frame.

[0015] A plurality of X mechanism front crossbeams are fixedly connected between the front ends of the two X mechanism frames, and a plurality of X mechanism rear crossbeams are fixedly connected between the rear ends of the two X mechanism vertical frames.

[0016] The present application at least includes the following beneficial effects: the structure of the model support connected by the X mechanism frame of the four-degree-of-freedom mechanism provided by the present application utilizes the X mechanism connection model support 2 of the four-degree-of-freedom mechanism, without the need to remove the side sliding base and the angle frame, and has the characteristics of convenient installation, strong bearing capacity, long support platform, multiple support points, and the ability to support large models.

[0017] Other advantages, objects and features of the present application will be apparent from the following description, and will be understood by those skilled in the art through practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0018] Fig. 1 The structure of the model support connected by the X mechanism frame of the four-degree-of-freedom mechanism is shown in the structure diagram.

[0019] Fig. 2 The structure of the model support connected by the X mechanism frame of the four-degree-of-freedom mechanism is shown in the structure diagram.

[0020] Fig. 3 The structure of the model support connected by the X mechanism frame of the four-degree-of-freedom mechanism is shown in the structure diagram. DETAILED DESCRIPTION

[0021] The present application will be further described in detail below with reference to the accompanying drawings, so that those skilled in the art can implement the present application according to the description.

[0022] It should be understood that the terms such as "have", "contain" and "include" used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0023] It should be noted that in the description of this invention, the orientations or positional relationships indicated by terms are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installed", "equipped", "sleeved / connected", "connected", etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] Furthermore, in this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Moreover, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0026] like Figs. 1-3 As shown: A structure of the present invention, employing a four-degree-of-freedom mechanism in the X-direction to connect a model support frame, includes:

[0027] Organization X, 1;

[0028] Model support 2 is fixed to the X mechanism frame 101 of the X mechanism 1, and the upper end of the model support 2 supports the model.

[0029] Working principle: the structure provided by the application adopts four-degree-of-freedom mechanism X mechanism frame connection model support, utilizes the X mechanism connection model support 2 of four-degree-of-freedom mechanism, without removing the side slip base and angle of attack frame, the application has the characteristics of convenient installation, strong bearing capacity, strong anti-seismic ability, large support platform length, many support points and supporting large models. In order to adopt X mechanism 1 to connect model support 2, the middle support of the angle of attack frame is removed, the lower support is reserved, and the lower support is operated to the large angle of attack position, so that the lower support is completely retracted into the angle of attack frame. The Y mechanism and the side slip base are driven by the Y mechanism servo oil cylinder to make the side slip base and the angle of attack frame descend as a whole until the uppermost part of the angle of attack frame is completely submerged below the height of the X mechanism frame 101, so that the beam 201 of the model support 2 is conveniently installed on the X mechanism frame 101.

[0030] In the above technical solution, the structure of the model support 2 comprises:

[0031] Three groups of beams 201 are fixedly installed across the X mechanism frame 101, and the three groups of beams 201 are used to cross the wide X mechanism frame 101 and are connected with the X mechanism frame 101 to provide a bottom support with sufficient strength and rigidity for the support platform 202 to bear the load received by the upper support platform 202; after the beam 201 and the support platform 202 are installed on the X mechanism frame 101, the top plane of the support platform 202 should be far away from the flow field boundary to reduce the blockage, and the farther the better under the condition that the strength and rigidity of the support column meet the requirements. The curved knife support on the angle of attack frame removes the middle support, the lower support is retracted into the angle of attack frame, and the beam 201 and the X mechanism frame 101 are connected and fastened by screws and pins to bear the model load and impact.

[0032] The support platform 202 is fixedly arranged at the upper end of the two groups of beams 201, and the support platform 202 is used to provide a unified, flat and accurate platform for the upper support columns 203, and the support platform 202 is usually processed by welding frame, and the specific determination is based on the test characteristics and requirements; since the support platform 202 is not moved after installation, it will not move in the X direction (horizontal direction) and the Y direction (vertical direction), and it is fixed with the test cabin body through the X mechanism, which significantly improves the anti-seismic ability of the support platform 202.

[0033] Six support columns 203 are fixedly arranged at the upper end of the support platform 202 in pairs, and the cross section of the support column 203 is a blade structure to reduce airflow blockage, and the specific height, size and number of the support column 203 are determined according to the model and test requirements. Generally speaking, the longer the model 3 or the greater the load, the more support columns are needed, and the distance between the support columns is greater.

[0034] In the above technical solution, the support platform 202 is a frame structure, and two longitudinal beams 205 above the support platform 202 are fixedly installed with a connecting plate 204, and the support column 203 is fixed at both ends of the connecting plate 204.

[0035] In the above technical solution, the structure of the X mechanism comprises:

[0036] The base 107 is fixedly provided with an X mechanism lower beam 106 in a rectangular frame structure at the upper end, two X mechanism frames 101 are fixedly arranged at the upper end of the X mechanism lower beam 106, the upper surface of the X mechanism frame 101 is provided with an X mechanism connecting surface 104, and the beam 201 of the model support 2 is fixedly connected with the X mechanism connecting surface 104.

[0037] A plurality of X mechanism front beams 108 are fixedly connected between the front ends of the two X mechanism frames 101, and a plurality of X mechanism rear beams 105 are fixedly connected between the rear ends of the two X mechanism frames 101.

[0038] When the middle support of the four-degree-of-freedom mechanism is connected with the model (i.e., the bending knife support is installed in the angle mechanism, and the model is supported by the middle support of the bending knife support), the load and length of the model are greatly limited. For example, the middle support of the four-degree-of-freedom mechanism of a certain 2-meter-level wind tunnel, the upward lifting force (perpendicular to the model axis direction) and the axial force (parallel to the model axis direction) or the resultant force thereof are not more than 50,000 N, and the length of the supported model is not more than 4 m.

[0039] The length of the model connected with the four-degree-of-freedom Y mechanism provided by the application can be more than 10 m, the maximum axial force allowed to be borne is mainly limited by the strength of the support connection, the strength of the four-degree-of-freedom mechanism body and the base, and is mainly used for reliable connection and support of super-long and super-large models without moving position and attitude, and with large load and large vibration. Such models cannot be supported by traditional middle supports.

[0040] The number of devices and the processing scale described herein are used to simplify the description of the application. The application, modification and change of the application to the person skilled in the art are obvious.

[0041] Although the embodiments of the application have been disclosed as above, they are not limited to the application and implementation listed in the specification, and can be fully applied to various fields suitable for the application, and additional modifications can be easily realized by those skilled in the art, therefore, the application is not limited to specific details and the figures shown and described herein, without departing from the general concept defined by the claims and the equivalent scope.

Claims

1. A structure employing a four-degree-of-freedom X-direction mechanism to connect a model support frame, characterized in that, Comprise: X mechanism; Model support fixed on the X mechanism frame of the X mechanism, the upper end of the model support supporting a model; The structure of the model support comprises: At least three groups of cross beams are fixedly installed across the X mechanism frame; Support platform fixedly arranged at the upper end of the cross beam; A plurality of support columns are fixedly arranged in pairs at the upper end of the support platform; The support platform is a frame structure, and a connecting plate is fixedly installed between the two longitudinal beams above the support platform, and the support columns are fixed at both ends of the connecting plate; The cross section of the support column is a blade structure; The structure of the X mechanism comprises: The base is fixedly provided with an X mechanism lower cross beam in a rectangular frame structure at the upper end, two X mechanism frames are fixedly arranged at the upper end of the X mechanism lower cross beam, and the upper surface of the X mechanism frame is provided with an X mechanism connecting surface; A plurality of X mechanism front cross beams are fixedly connected between the front ends of the two X mechanism frames, and a plurality of X mechanism rear cross beams are fixedly connected between the rear ends of the two X mechanism vertical frames.

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