A force test device for fixing two-stage branches in a wind tunnel and adjusting angles

Abstract

A force test device for fixing secondary branches in a wind tunnel and adjusting the angle, relates to the wind resistance research of street trees. It comprises a force measuring component, a branch fixing component, a sleeve fixing component and a base component. The force measuring component comprises six force gauges and protective shells for protecting the force gauges. The branch fixing component comprises a sleeve, an arc-shaped ring and corresponding sleeve adjusting screws. The sleeve fixing component comprises a large cylinder with a scale disc and a pointer, four friction blocks on the side and a base at the lower part with friction blocks. The base component comprises a base with considerable mass and volume, and a rotating disc on the base. The device has simple structure and is convenient to use, can be repeatedly used for many times, can meet the requirement of fixing secondary branches of different sizes in the wind tunnel experiment, and can adjust the wind attack angle and the wind inclination angle to obtain the wind tunnel test data of secondary branches under different growth directions and different incoming flow directions.

Description

Technical Field

[0001] This invention relates to the field of wind resistance research technology for roadside trees, and in particular to a force measuring test device for fixing secondary branches of roadside trees in a wind tunnel and being able to adjust the wind attack angle and wind tilt angle as required, thereby measuring the wind force data of the secondary branches under the corresponding conditions. Background Technology

[0002] Street trees are often prone to falling over in strong winds, or even being snapped in half or uprooted. However, the theoretical analysis of the mechanical mechanism of street trees under wind pressure is not yet complete. Wind tunnel tests can simplify complex systems and are an effective means of studying the effects of wind on street trees under controlled conditions.

[0003] The existing wind tunnel size is insufficient to place the entire street tree in it for wind tunnel testing. Therefore, we consider conducting wind tunnel tests on the secondary branches to obtain the stress on the branch ends, and then further calculate the stress on the entire plant under the action of wind.

[0004] How to fix secondary branches in a wind tunnel is a prerequisite for accurately studying the relationship between branches and wind. Existing wind tunnel model fixing frame technology has the following problems: the existing wind tunnel model fixing frame cannot properly fix the end according to the size of the fixed model, nor can it adjust the tilt angle of the object being measured, which is very troublesome to use. Moreover, it cannot measure the wind force data of secondary branches under different growth directions. Summary of the Invention

[0005] The purpose of this invention is to address the problems of existing wind tunnel model fixing frames being cumbersome to use and unable to fully meet the requirements of experiments. It provides a force-measuring test device for fixing secondary branches of roadside trees in a wind tunnel, which allows for adjustment of the wind attack angle and wind tilt angle as required, thereby measuring the wind force data experienced by the secondary branches under corresponding conditions. Furthermore, it provides a fixing frame for secondary branches in a wind tunnel that can adjust the tilt angle of the secondary branches according to experimental requirements, simulating the growth direction of the secondary branches, and can also meet the fixing needs of secondary branches of different sizes.

[0006] A force-measuring test device for fixing secondary tree branches in a wind tunnel with adjustable angle, comprising:

[0007] A force measuring assembly, comprising a plurality of force gauges and a protective housing for the force gauges;

[0008] A tree branch fixing assembly, comprising a sleeve, an arc-shaped ring, and sleeve adjusting screws corresponding to the number and position of the rings;

[0009] The sleeve fixing assembly comprises a cylinder, the cylinder is provided with a scale disc and a pointer, the side of the cylinder is provided with four friction blocks, and the lower part of the cylinder is provided with a base, and the base is provided with a bottom friction block.

[0010] The base assembly comprises a base, the base is provided with a rotating disc, and the force meter is fixed above the rotating disc.

[0011] Preferably, the sleeve in the sleeve fixing assembly and the cylinder in the sleeve fixing assembly are fixedly connected through welding, and the center line of the sleeve should be in the same straight line with the diameter of the middle circular section of the bottom cylinder.

[0012] Preferably, the connection between the cylinder in the sleeve fixing assembly and the base is achieved through a connector at the central axis of the cylinder, so as to ensure that the cylinder can rotate and not deviate from the central axis. Meanwhile, the pointer at the central axis of the cylinder indicates the scale, which is marked on the cylinder, to meet the requirements of different inclination angles of the branches.

[0013] Preferably, the fixing of the cylinder in the sleeve fixing assembly is achieved through four friction blocks on the side of the cylinder, and each friction block is provided with four adjusting screws.

[0014] Preferably, the arc-shaped rings in the branch fixing assembly are eight in total, i.e. two layers, four in each layer, and the arc-shaped rings are fixed with the adjusting screws and adjusted in position through the adjusting screws.

[0015] Through the above scheme, the present application at least has the following beneficial effects:

[0016] 1. The rotating cylinder of the branch fixing frame of the wind tunnel drives the sleeve to rotate, and after reaching a certain angle, the friction blocks are tightened, so that the secondary branch wind force test under different wind inclination angles can be adjusted according to different needs, and thus the wind tunnel test data of the secondary branches in different growth directions can be obtained.

[0017] 2. The branch fixing frame of the wind tunnel is placed at the base and provided with a rotating disc, and the secondary branch wind force test under different wind attack angles can be adjusted according to different needs through adjusting the rotating disc, so that the wind tunnel test data of the secondary branches under different incoming flow wind directions can be obtained.

[0018] 3. The branch fixing frame of the wind tunnel adjusts the position of the arc-shaped rings in the sleeve to meet the situation that the shapes of the secondary branches are not necessarily regular and the sizes are not necessarily definite, and thus the secondary branches can be easily adjusted and used according to needs, so that the secondary branches are not easy to fall off during the wind tunnel test.

[0019] 4. The present application has the advantages of simple structure, convenient use, repeated use, meeting the requirements of fixing secondary branches of different sizes in the wind tunnel experiment, and being capable of adjusting the wind attack angle and the wind inclination angle to obtain the wind tunnel test data of the secondary branches in different growth directions and under different incoming flow wind directions.BRIEF DESCRIPTION OF DRAWINGS BRIEF DESCRIPTION OF DRAWINGS

[0020] Fig. 1 A cross-sectional structure diagram of a two-stage branch fixing frame of a wind tunnel is provided.

[0021] Fig. 2 A structure diagram of a branch fixing assembly is provided.

[0022] Fig. 3 A structure diagram of a sleeve fixing assembly is provided. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0024] Referring to Figs. 1-3 , the present application is a test device embodiment for fixing two-stage branches and adjusting angles of a wind tunnel, comprising:

[0025] The force measuring assembly comprises six force gauges 10, and the six force gauges 10 are externally provided with a force gauge protection shell 15.

[0026] The branch fixing assembly comprises a sleeve 1, eight arc-shaped rings 14, and eight corresponding sleeve adjusting screws 2.

[0027] The sleeve fixing assembly comprises a cylinder 4, the side of the cylinder 4 is provided with four friction blocks 5, the cylinder 4 is fixed through the four friction blocks 5 on the side, and each friction block 5 is provided with four friction block fixing screws 6; the friction block 5 is connected with the force gauge protection shell 15 below through a crank 9 and a pin 11; the lower part of the cylinder 4 is provided with a bottom friction block 8, which serves as the base of the cylinder 4; the bottom surface of the bottom friction block 8 is connected with the upper surface of the force gauge protection shell 15. The connection between the cylinder 4 and the bottom friction block 8 is achieved through a connecting piece 7 at the center axis of the cylinder, so as to ensure that the cylinder can rotate without deviation from the central axis. A pointer 3 is further arranged at the center axis of the cylinder 4 for indicating a scale arranged on the cylinder 4.

[0028] The base assembly comprises a base 13 and a turntable 12, both of which have considerable mass and volume. The turntable 12 is fixed on the base 13 through screws; the force gauges 10 are fixed above the turntable 12, and the central lines of the turntable 12, the base 13 and the force gauge protection shell are on the same straight line, so as to be placed stably and accurately read out data of the force gauges.

[0029] The cylinder 4 and the sleeve 1 are fixedly connected by welding, and the sleeve center line should be in line with the middle circular section diameter of the bottom cylinder; the arc-shaped annular rings 14 are provided with 8, i.e. two layers, each layer has 4, the arc-shaped annular rings 14 are fixed with the sleeve adjusting screws 2, and the positions of the arc-shaped annular rings 14 are adjusted through the sleeve adjusting screws 2. The sleeve 1 adjusts the positions of the arc-shaped annular rings 14 through the sleeve adjusting screws 2 to fix the secondary branches of different shapes and sizes.

[0030] The cylinder 4 adjusts the friction block 5 through the friction block fixing screw 6, so as to fix the positions of the cylinder 4 and the sleeve 1, and meet the requirements of different inclination angles.

[0031] In use, after the device is installed, the friction block fixing screw 6 is loosened, then the cylinder 4 is rotated, the angle between the secondary branch and the trunk, i.e. the wind inclination angle, is determined according to the scale on the cylinder 4 pointed by the pointer 3, after the determination, the friction block fixing screw 6 is tightened to fix the wind inclination angle. The secondary branch is placed into the sleeve 1, the eight sleeve adjusting screws 2 are adjusted according to the shape and size of the branch to fix the branch, so that the branch is not easy to fall off in the wind tunnel test. After the wind attack angle is adjusted, the turntable 12 is fixed to meet the requirements of different wind attack angles. Through the above steps, the secondary branches of different sizes and shapes can be conveniently and efficiently adjusted to different wind attack angles and wind inclination angles in the wind tunnel, so as to perform the wind power test.

[0032] The above-described embodiments are only used to describe the preferred modes of the present application, and do not limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements of the technical solutions of the present application made by those skilled in the art should fall within the protection scope determined by the claims of the present application.

Claims

1. A force test device for fixing two-stage branches and adjusting angles in a wind tunnel, characterized in that, It comprises: a force measurement assembly comprising several force gauges and a force gauge protection shell; a branch fixing assembly comprising a sleeve, a plurality of arc-shaped rings and sleeve adjusting screws corresponding to the positions of the arc-shaped rings; the arc-shaped rings are fixed with the sleeve adjusting screws, and the positions of the arc-shaped rings are adjusted through the sleeve adjusting screws; a sleeve fixing assembly comprising a cylinder, a scale disc and a pointer arranged on the cylinder, a plurality of friction blocks arranged on the side of the cylinder, the cylinder being fixed through the plurality of friction blocks, a bottom friction block arranged at the lower part of the cylinder, the bottom friction block serving as the base of the cylinder; the friction blocks are connected with the force gauge protection shell below through a crank and a pin; the sleeve and the cylinder are fixedly connected through welding; the cylinder and the base are connected through a connecting piece at the central axis of the cylinder to ensure that the cylinder can rotate without deviating from the central axis; a base assembly comprising a base, a turntable arranged on the base, and a force gauge fixed above the turntable.

2. The force testing device of claim 1, wherein, The central line of the sleeve and the diameter of the middle circular section of the cylinder are on the same straight line.

3. The force testing device of claim 1, wherein the second branch is fixed in the wind tunnel and the angle is adjustable. The side of the cylinder in the sleeve fixing assembly is provided with four friction blocks, and each friction block is provided with four friction block fixing screws.

4. The force testing device of claim 1, wherein the second branch is fixed in the wind tunnel and the angle is adjustable. The arc-shaped rings in the branch fixing assembly are a total of eight, i.e. two layers, four in each layer.

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