A high and low temperature test chamber for calibrating temperature-affected parameters of wind tunnel balance

Abstract

The present invention discloses a high and low temperature test chamber for calibrating the temperature-influencing parameters of a wind tunnel balance, which belongs to a sensor environment simulation test device. Specifically, it includes six parts: a temperature control box, a temperature control box support frame, a balance support device, a six-degree-of-freedom adjustment loading head, and a weight plate; the calibrated wind tunnel balance is installed in the temperature control box, and the ambient temperature around the wind tunnel balance can be adjusted through the temperature control box. The temperature control box support frame is welded from square steel, and its main function is to reserve loading space and facilitate manual installation and operation. The balance support device and the six-degree-of-freedom adjustment loading head can realize the adjustment of the six-degree-of-freedom posture and load matching relationship of the balance, and adjust the connecting rod of the weight plate to a suitable position. The six-degree-of-freedom adjustment loading head realizes the simultaneous loading of 6-component loads on the balance.

Description

Technical Field

[0001] The invention belongs to the technical field of aerospace aerodynamics experimental testing, and is a complete wind tunnel balance temperature influence parameter calibration and detection system. Background Art

[0002] The wind tunnel strain balance is the core instrument and equipment for wind tunnel force testing of aerospace vehicles. It measures the aerodynamic force on the aircraft model in the wind tunnel flow field. Conventional wind tunnel balances are used to measure the aerodynamic force of the entire aircraft / bomb, and special balances are generally used to measure the aerodynamic force on the wing surface, rudder surface, external attachments, or aerodynamic force under special working conditions such as jets. In order to accurately simulate the flow field of the aircraft, the total flow field temperature of the wind tunnel is generally -50℃~1500℃. The wind tunnel balance is inside the model, and the ambient temperature of the surrounding environment generally varies by -50℃~100℃, which causes the elastic modulus of the wind tunnel balance material and the resistivity of the strain gauge and wire to change, and the zero load reading and sensitivity of the wind tunnel balance will have a large drift. Temperature changes have a great influence on the wind tunnel balance force test. The accuracy and reliability of temperature correction directly affect the accuracy and reliability of the wind tunnel balance force test.

[0003] The development of aerospace technology is inseparable from the support of wind tunnel aerodynamic test technology. At present, in order to obtain the stress conditions of aircraft in more environments, more and more experiments require that the wind tunnel balance can accurately measure the stress conditions of aircraft at various temperatures. Therefore, the present invention develops a high and low temperature test system for calibrating the signal drift parameters and sensitivity drift coefficient of the wind tunnel balance at different temperatures, which can be used to correct the test data of the wind tunnel balance at different temperatures.

[0004] The correction of wind tunnel balance temperature effect is an important part of the wind tunnel balance development work. In the past, the temperature drift of the wind tunnel balance reading was reduced by adding temperature compensation resistor wire, without special calibration, ignoring the drift of the balance sensitivity coefficient, and the wind tunnel balance temperature correction method had certain systematic errors. With the increasing requirements for the accuracy of wind tunnel test data in aerospace aircraft design, the temperature effect of the wind tunnel has become an important factor that cannot be ignored in aircraft wind tunnel tests, and the calibration of wind tunnel balance temperature effect has gradually been carried out at home and abroad. The practice of the Langley Center in the United States and ETW in Germany is to place the loading head and balance in the static calibration system of the wind tunnel balance in a temperature test chamber and carry out balance calibration at different temperatures; the practice of JAXA in Japan is to place the entire wind tunnel balance static calibration system in a controllable temperature environment, adjust the temperature of the entire space, and then calibrate the balance. The disadvantages of the American and German practices are that the calibration system structure is complex and the calibration efficiency is low; the disadvantage of the Japanese practice is that the mass and temperature control load of the entire calibration system are too large, the energy consumption is high, and the efficiency is low. In 2015, the China Academy of Aerospace Aerodynamics was authorized to develop a strain gauge balance temperature effect calibration system (patent number: 201310718447.8). Using low-temperature motors and mechanical devices, the temperature effect calibration of the axial force and rolling moment of the wind tunnel balance can be performed in a low-temperature test chamber. The disadvantage is that the motor power and mechanical efficiency of the equipment are severely reduced below -50°C, and it cannot operate normally. No other domestic units have publicly published a mature wind tunnel balance temperature effect coefficient calibration system. Summary of the invention

[0005] The technical problem solved by the present invention is to overcome the deficiencies of the prior art and provide a calibration and detection system for temperature-affected parameters of a wind tunnel balance, which can effectively and accurately obtain the influence coefficient of temperature on the zero-load reading and sensitivity coefficient of the wind tunnel balance.

[0006] The technical solution of the present invention is: a high and low temperature test box for calibrating the temperature-affected parameters of a wind tunnel balance, the test box comprising a temperature control box, a temperature control box support frame, a balance support device, a six-degree-of-freedom adjustment loading head, and a weight plate;

[0007] The temperature control box is used to adjust the ambient temperature of the wind tunnel balance being tested. The temperature control box support frame is used to support the temperature control box so that the bottom of the temperature control box is higher than the ground, leaving loading space and facilitating manual installation and operation. The base of the balance support device is located outside the temperature control box, and extends into the temperature control box through the reserved holes on the side and bottom of the temperature control box, and forms a four-degree-of-freedom mechanism in the temperature control box. One end of the calibrated wind tunnel balance is fixedly installed at the output end of the four-degree-of-freedom mechanism. The four degrees of freedom include the horizontal direction and the axial translational freedom of the calibrated wind tunnel balance perpendicular to the horizontal direction, the axial translational freedom of the calibrated wind tunnel balance around the horizontal direction and around the horizontal direction The axial rotational freedom of the quasi-wind tunnel balance; the six-degree-of-freedom adjustment loading head is installed on the calibrated wind tunnel balance, and the weight disk is suspended directly below the six-degree-of-freedom adjustment loading head through a connecting rod. The connecting rod passes through the bottom of the temperature control box, so that the weight disk is located outside the temperature control box, and the six-degree-of-freedom adjustment loading head cooperates with the four-degree-of-freedom mechanism to keep the position of the weight disk unchanged; by adjusting the relative position and posture of the six-degree-of-freedom adjustment loading head and the calibrated wind tunnel balance, the load in the direction of gravity provided by the weight disk perpendicular to the ground is decomposed, providing separate loading and simultaneous loading in 6 degrees of freedom directions for the calibrated wind tunnel balance.

[0008] The high and low temperature test box for calibrating the temperature-influenced parameters of a wind tunnel balance also includes a weight loading device, which automatically rises and falls to lift the automatically loaded weights, thereby realizing automatic loading of the weights on the weight plate.

[0009] The temperature adjustment range of the temperature adjustment box is -80°C to 130°C.

[0010] The temperature control box support frame is welded from square steel.

[0011] The balance support device includes a base, a welding bracket, a first linear module, a first support, a first worm gear reducer, a horizontal cylindrical shaft, an upper column, a lower column, a second support, a second linear module, a right-angle support, and a second worm gear reducer; the first linear module and the second linear module each include a guide rail and a slider, and the slider can slide along a straight line relative to the guide rail;

[0012] Among them, the base, the welding bracket, the first linear module, the first support, the first worm gear reducer and the lower column are located outside the temperature control box; the welding bracket is fixedly installed on the base, the first linear module guide rail is fixedly installed on the upper surface of the welding bracket, the first support is installed on the first linear module slider, the first worm gear reducer is fixedly installed on the first support, the first end of the horizontal cylindrical shaft is fixedly connected to the output shaft of the first worm gear reducer, and the second end passes through the central through hole of the first support and the through hole on the side of the temperature control box in sequence to enter the interior of the temperature control box, and then passes through the second support and is connected to the second support through a bearing;

[0013] The lower column is vertically fixedly installed on the base, one end of the upper column is fixedly connected to the lower column, and the other end of the upper column passes through the bottom surface of the temperature control box into the temperature control box and is fixedly connected to the second support;

[0014] The guide rail of the second linear module is fixedly connected to the second end face of the horizontal cylindrical shaft, the right-angle support includes two mutually perpendicular plates, which are denoted as the first plate and the second plate, the first plate is fixedly mounted on the slider of the second linear module, the second worm gear reducer is a flange output type, which is mounted on the second plate, and the calibrated wind tunnel balance is mounted on the output shaft of the second worm gear reducer;

[0015] The first linear module provides the calibrated wind tunnel balance with horizontal translational freedom, the first worm gear reducer and the horizontal cylindrical shaft provide the calibrated wind tunnel balance with horizontal rotational freedom, the second linear module provides the calibrated wind tunnel balance with axial translational freedom, and the second worm gear reducer provides the calibrated wind tunnel balance with rotational freedom around its axial direction.

[0016] The weight loading device comprises a weight loading base plate, a spiral elevator, a first cylindrical shaft, a second cylindrical shaft, a third cylindrical shaft, a fourth cylindrical shaft, and a weight loading top plate; the weight loading base plate is used to fix and support the entire device, the base of the spiral elevator is fixedly installed on the upper surface of the weight loading base plate, the movable end of the spiral elevator comprises a lead screw and a nut, the nut is fixedly installed on the lower surface of the weight loading top plate, one end of the first cylindrical shaft, the second cylindrical shaft, the third cylindrical shaft, and the fourth cylindrical shaft are fixedly connected to the base plate, and the other ends pass through guide holes on the four corners of the weight loading top plate, the shaft body is connected to the weight loading top plate through a linear bearing, the lead screw of the spiral elevator rotates to drive the weight loading top plate to rise and fall, and the weight is automatically loaded on the weight loading top plate.

[0017] The six-degree-of-freedom adjustment loading head includes a center sleeve, a three-degree-of-freedom bearing assembly, and a transfer adapter;

[0018] The calibrated wind tunnel balance is fixed in the central sleeve, and the three-degree-of-freedom bearing assembly includes an inner ring flange, an outer ring flange, and a U-shaped frame. The outer ring of the inner ring flange is connected to the inner ring of the outer ring flange through a bearing and can rotate relatively. The outer ring flange is connected to the two ends of the U-shaped frame through a bearing at the opposite positions on the outside in the diameter direction, and the U-shaped frame can rotate around the diameter of the outer ring flange. The central sleeve equipped with the calibrated wind tunnel balance passes through the central hole of the inner ring flange and is fixedly connected to the inner ring flange through an adapter. By replacing the adapter or using different adapter mounting holes, the relative positions of the three axial directions of the central sleeve relative to the three-degree-of-freedom bearing assembly can be adjusted. By adjusting the first worm gear reducer and the second worm gear reducer of the balance support device, the spatial attitude angle of the central sleeve and the wind tunnel balance inside it can be changed, thereby changing the angle and distance between the gravity direction and the axes of the wind tunnel balance body coordinate system, resulting in changes in the projection components of the weight gravity on the axes of the wind tunnel balance body coordinate system and the torques around the axes of the body coordinate system, that is, the six-degree-of-freedom load components.

[0019] The beneficial effects of the present invention compared with the prior art are:

[0020] (1) The present invention can flexibly and quickly calibrate the zero load reading temperature drift and sensitivity coefficient temperature drift of a six-component wind tunnel balance;

[0021] (2) The present invention adopts a method of installing a wind tunnel balance in a temperature control box and loading it outside the temperature control box, thereby avoiding the technical difficulties of high / low temperature operation of the electromechanical system, reducing the load of temperature regulation, and realizing temperature effect calibration in a larger temperature range;

[0022] (3) The present invention can flexibly adjust the posture and position of the amplitude balance through the combination of the balance support device and the six-degree-of-freedom adjustment loading head, and use a loading tool to complete the simultaneous loading of six components of the load, and the loading point is located directly above the weight loading device;

[0023] (4) The weight loading device of the present invention is located outside the temperature control box, which is more flexible to operate and can temporarily add or subtract weights manually. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A three-dimensional isometric view of a high and low temperature test chamber for calibrating temperature-affected parameters of a wind tunnel balance according to an embodiment of the present invention;

[0025] Figure 2 This is a schematic structural diagram of a balance support device according to an embodiment of the present invention;

[0026] Figure 3 This is a schematic structural diagram of a weight loading device according to an embodiment of the present invention;

[0027] Figure 4This is a schematic diagram of the structure of the six-degree-of-freedom adjustment loading head and the weight plate according to an embodiment of the present invention. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the embodiments.

[0029] like Figure 1 As shown, the present invention provides a high and low temperature test chamber for calibrating temperature influence parameters of a wind tunnel balance, which includes a temperature control box 1, a temperature control box support frame 2, a balance support device 3, a six-degree-of-freedom adjustment loading head 5, a weight plate, and a weight loading device 4.

[0030] The temperature control box 1 is used to adjust the ambient temperature of the wind tunnel balance being tested. The temperature control box support frame 2 is used to support the temperature control box 1 so that the bottom of the temperature control box 1 is higher than the ground, leaving loading space and facilitating manual installation and operation. The base of the balance support device 3 is located outside the temperature control box 1, and extends into the temperature control box through the reserved holes on the side and bottom of the temperature control box, and forms a four-degree-of-freedom mechanism in the temperature control box. One end of the calibrated wind tunnel balance is fixedly installed at the output end of the four-degree-of-freedom mechanism. The four degrees of freedom include the horizontal direction and the axial translational freedom of the calibrated wind tunnel balance perpendicular to the horizontal direction, the axial translational freedom of the calibrated wind tunnel balance around the horizontal direction and around the vertical direction. The axial rotational degree of freedom of the quasi-wind tunnel balance; the six-degree-of-freedom adjustment loading head 5 is installed on the calibrated wind tunnel balance, and the weight disk is suspended directly below the six-degree-of-freedom adjustment loading head 5 through a connecting rod. The connecting rod passes through the bottom of the temperature control box, so that the weight disk is located outside the temperature control box 1, and the six-degree-of-freedom adjustment loading head 5 cooperates with the four-degree-of-freedom mechanism to keep the position of the weight disk unchanged; by adjusting the relative position and posture of the six-degree-of-freedom adjustment loading head 5 and the calibrated wind tunnel balance, the load in the direction of gravity provided by the weight disk perpendicular to the ground is decomposed, providing separate loading and simultaneous loading in 6 degrees of freedom directions for the calibrated wind tunnel balance.

[0031] The weight loading device 4 automatically rises and falls to lift the automatically loaded weights, thereby realizing automatic loading of the weights on the weight plate.

[0032] In the above test chamber, the temperature control chamber 1 needs to be customized according to the mechanical interface of the balance support device 3 and the weight loading device 4. The internal working space size of the test chamber is recommended to be no less than 1500mmx1500mmx1500mm, which is convenient for arranging a larger wind tunnel balance and loading head, and performing internal operations. The temperature adjustment range and other technical indicators of the temperature control chamber can be customized according to the calibration requirements.

[0033] Preferably, the temperature control box support frame 2 is welded from square steel, and its temperature adjustment range is -80°C to 130°C, and the temperature adjustment rate is 2°C / minute. The size and structure of the temperature control box support frame 2 can be adjusted according to the size parameters of the temperature control box 1 and the weight loading device 4 and the calibration load range.

[0034] like Figure 2 As shown, the balance support device 3 includes a base, a welding bracket, a first linear module, a first support, a first worm gear reducer, a horizontal cylindrical shaft, an upper column, a lower column, a second support, a second linear module, a right-angle support, and a second worm gear reducer; the first linear module and the second linear module both include a guide rail and a slider, and the slider can slide along a straight line relative to the guide rail;

[0035] Among them, the base, the welding bracket, the first linear module, the first support, the first worm gear reducer and the lower column are located outside the temperature control box 1; the welding bracket is fixedly installed on the base, the first linear module guide rail is fixedly installed on the upper surface of the welding bracket, the first support is installed on the first linear module slider, the first worm gear reducer is fixedly installed on the first support, the first end of the horizontal cylindrical shaft is fixedly connected to the output shaft of the first worm gear reducer, and the second end passes through the central through hole of the first support and the through hole on the side of the temperature control box in sequence to enter the interior of the temperature control box, and then passes through the second support and is connected to the second support through a bearing;

[0036] The lower column is vertically fixedly installed on the base, one end of the upper column is fixedly connected to the lower column, and the other end of the upper column passes through the bottom surface of the temperature control box into the temperature control box and is fixedly connected to the second support;

[0037] The guide rail of the second linear module is fixedly connected to the second end face of the horizontal cylindrical shaft, the right-angle support includes two mutually perpendicular plates, which are denoted as the first plate and the second plate, the first plate is fixedly mounted on the slider of the second linear module, the second worm gear reducer is a flange output type, which is mounted on the second plate, and the calibrated wind tunnel balance is mounted on the output shaft of the second worm gear reducer;

[0038] The first linear module provides the calibrated wind tunnel balance with horizontal translational freedom, the first worm gear reducer and the horizontal cylindrical shaft provide the calibrated wind tunnel balance with horizontal rotational freedom, the second linear module provides the calibrated wind tunnel balance with axial translational freedom, and the second worm gear reducer provides the calibrated wind tunnel balance with rotational freedom around its axial direction.

[0039] The balance support device 3 can provide the balance with four degrees of freedom of movement, namely, axial, lateral, pitch, and roll. The structural rigidity can be effectively improved by increasing the diameters of the horizontal cylindrical axis, the upper column, and the lower column.

[0040] like Figure 3As shown, the weight loading device 4 includes a weight loading base plate, a spiral elevator, a first cylindrical shaft, a second cylindrical shaft, a third cylindrical shaft, a fourth cylindrical shaft, and a weight loading top plate; the weight loading base plate is used to fix and support the entire device, the base of the spiral elevator is fixedly installed on the upper surface of the weight loading base plate, the movable end of the spiral elevator includes a lead screw and a nut, the nut is fixedly installed on the lower surface of the weight loading top plate, one end of the first cylindrical shaft, the second cylindrical shaft, the third cylindrical shaft, and the fourth cylindrical shaft are fixedly connected to the base plate, and the other ends pass through the guide holes on the four corners of the weight loading top plate, the shaft body is connected to the weight loading top plate through a linear bearing, the lead screw of the spiral elevator rotates to drive the weight loading top plate to rise and fall, and the weight is automatically loaded on the weight loading top plate.

[0041] like Figure 4 As shown, the six-degree-of-freedom adjustment loading head 5 includes a center sleeve, a three-degree-of-freedom bearing assembly, and a transfer adapter;

[0042] The calibrated wind tunnel balance is fixed in the central sleeve, and the three-degree-of-freedom bearing assembly includes an inner ring flange, an outer ring flange, and a U-shaped frame. The outer ring of the inner ring flange is connected to the inner ring of the outer ring flange through a bearing and can rotate relatively. The outer ring flange is connected to the two ends of the U-shaped frame through a bearing at the opposite positions on the outside in the diameter direction, and the U-shaped frame can rotate around the diameter of the outer ring flange. The central sleeve equipped with the calibrated wind tunnel balance passes through the central hole of the inner ring flange and is fixedly connected to the inner ring flange through an adapter. By replacing the adapter or using different adapter mounting holes, the relative positions of the three axial directions of the central sleeve relative to the three-degree-of-freedom bearing assembly can be adjusted. By adjusting the first worm gear reducer and the second worm gear reducer of the balance support device, the spatial attitude angle of the central sleeve and the wind tunnel balance inside it can be changed, thereby changing the angle and distance between the gravity direction and the axes of the wind tunnel balance body coordinate system, resulting in changes in the projection components of the weight gravity on the axes of the wind tunnel balance body coordinate system and the torques around the axes of the body coordinate system, that is, the six-degree-of-freedom load components. The connecting rod with the weight plate suspended thereon is connected at the midpoint of the bottom of the U-shaped frame.

[0043] The weight loading device 4 can be as follows Figure 3 The automatic loading device shown can also be replaced by a simple hanging plate to form a manual loading device.

[0044] The six-degree-of-freedom adjustment loading head 5 can be made by referring to the American single vector method Figure 4 The loading head of the structure shown uses one loading point to perform six-component loading on the wind tunnel balance and can also be simplified in design.

[0045] The specific operation method of the high and low temperature test chamber for calibrating the temperature influence parameters of the wind tunnel balance includes the following steps:

[0046] Step 1: In the experimental box 1, install the calibrated wind tunnel balance on the supporting end of the balance supporting device 3, and install the six-degree-of-freedom adjustment loading head 5 on the other end of the calibrated wind tunnel balance;

[0047] Step 2: Adjust the first worm gear reducer and the second worm gear reducer of the balance support device 3, adjust the horizontal mounting hole of the six-degree-of-freedom adjustment loading head 5, and change the matching relationship between the six components of the load;

[0048] Step three: adjust the first linear module slider and the second linear module slider of the balance support device 3 so that the connecting rod connected to the six-degree-of-freedom adjustment loading head 5 is aligned with the reserved hole of the temperature control box, and connect the weight loading device;

[0049] Step 4: Under room temperature conditions, a set of loads is applied to the balance through the weight loading device 4, and the temperature value and the increment of the balance output voltage signal are recorded simultaneously;

[0050] Step 5: Adjust the temperature of the temperature control box 1, apply the same load group as that at room temperature to the balance through the weight loading device 4 at different temperatures, and record the temperature value and the increment of the balance output signal;

[0051] Step 6: Use mathematical methods such as least squares method and Gaussian elimination method to process the temperature, load, and balance signal increment data together to obtain the influence coefficient of temperature on zero load reading and balance sensitivity coefficient.

[0052] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A high and low temperature test chamber for calibrating temperature influence parameters of a wind tunnel balance, characterized in that It comprises a temperature control box (1), a temperature control box support frame (2), a balance support device (3), a six-degree-of-freedom adjustment loading head (5), a weight plate, and a weight loading device (4); The temperature control box (1) is used to adjust the ambient temperature of the wind tunnel balance to be measured, and the temperature control box support frame (2) is used to support the temperature control box (1) so that the bottom of the temperature control box (1) is higher than the ground, leaving a loading space and facilitating manual installation and operation; the base of the balance support device (3) is located outside the temperature control box (1), extends into the temperature control box through reserved holes on the side and bottom of the temperature control box, and forms a four-degree-of-freedom mechanism in the temperature control box, and one end of the calibrated wind tunnel balance is fixedly mounted on the output end of the four-degree-of-freedom mechanism, and the four degrees of freedom include a translational degree of freedom in a horizontal direction and an axial direction of the calibrated wind tunnel balance perpendicular to the horizontal direction, and a rotational degree of freedom around a horizontal direction and around an axial direction of the calibrated wind tunnel balance perpendicular to the horizontal direction; The six-degree-of-freedom adjustment loading head (5) is installed on the calibrated wind tunnel balance, the weight plate is suspended directly below the six-degree-of-freedom adjustment loading head (5) through a connecting rod, the connecting rod passes through the bottom of the temperature control box, so that the weight plate is located outside the temperature control box (1), and the six-degree-of-freedom adjustment loading head (5) cooperates with the four-degree-of-freedom mechanism to keep the position of the weight plate unchanged; by adjusting the relative position and posture of the six-degree-of-freedom adjustment loading head (5) and the calibrated wind tunnel balance, the load in the gravity direction provided by the weight plate perpendicular to the ground is decomposed, so as to provide separate loading and simultaneous loading in the six-degree-of-freedom directions for the calibrated wind tunnel balance; The weight loading device (4) automatically rises and falls to lift the automatically loaded weights, thereby realizing automatic loading of the weights on the weight plate; The balance support device (3) comprises a base, a welding bracket, a first linear module, a first support, a first worm gear reducer, a horizontal cylindrical shaft, an upper column, a lower column, a second support, a second linear module, a right-angle support, and a second worm gear reducer; the first linear module and the second linear module both comprise a guide rail and a slider, and the slider can slide along a straight line relative to the guide rail; The base, the welding bracket, the first linear module, the first support, the first worm gear reducer and the lower column are located outside the temperature control box (1); the welding bracket is fixedly mounted on the base, the first linear module guide rail is fixedly mounted on the upper surface of the welding bracket, the first support is mounted on the first linear module slider, the first worm gear reducer is fixedly mounted on the first support, the first end of the horizontal cylindrical shaft is fixedly connected to the output shaft of the first worm gear reducer, and the second end passes through the central through hole of the first support and the through hole on the side of the temperature control box in sequence to enter the interior of the temperature control box, and then passes through the second support and is connected to the second support via a bearing; The lower column is vertically fixedly installed on the base, one end of the upper column is fixedly connected to the lower column, and the other end of the upper column passes through the bottom surface of the temperature control box into the temperature control box and is fixedly connected to the second support; The guide rail of the second linear module is fixedly connected to the second end face of the horizontal cylindrical shaft, the right-angle support includes two mutually perpendicular plates, which are denoted as the first plate and the second plate, the first plate is fixedly mounted on the slider of the second linear module, the second worm gear reducer is a flange output type, which is mounted on the second plate, and the calibrated wind tunnel balance is mounted on the output shaft of the second worm gear reducer; The first linear module provides the calibrated wind tunnel balance with horizontal translational freedom, the first worm gear reducer and the horizontal cylindrical shaft provide the calibrated wind tunnel balance with horizontal rotational freedom, the second linear module provides the calibrated wind tunnel balance with axial translational freedom, and the second worm gear reducer provides the calibrated wind tunnel balance with rotational freedom around its axial direction.

2. A high and low temperature test chamber for calibrating temperature influence parameters of a wind tunnel balance according to claim 1, characterized in that The temperature control box (1) has a temperature adjustment range of -80°C to 130°C.

3. A high and low temperature test chamber for calibrating temperature influence parameters of a wind tunnel balance according to claim 1, characterized in that The temperature control box support frame (2) is welded from square steel.

4. A high and low temperature test chamber for calibrating temperature influence parameters of a wind tunnel balance according to claim 1, characterized in that The weight loading device (4) comprises a weight loading bottom plate, a spiral elevator, a first cylindrical shaft, a second cylindrical shaft, a third cylindrical shaft, a fourth cylindrical shaft, and a weight loading top plate; the weight loading bottom plate is used to fix and support the entire device, the base of the spiral elevator is fixedly installed on the upper surface of the weight loading bottom plate, the movable end of the spiral elevator comprises a lead screw and a nut, the nut is fixedly installed on the lower surface of the weight loading top plate, one end of the first cylindrical shaft, the second cylindrical shaft, the third cylindrical shaft, and the fourth cylindrical shaft are fixedly connected to the bottom plate, and the other ends pass through the guide holes on the four corners of the weight loading top plate, the shaft body is connected to the weight loading top plate through a linear bearing, the lead screw of the spiral elevator rotates to drive the weight loading top plate to rise and fall, and the weight is automatically loaded on the weight loading top plate.

5. The high and low temperature test chamber for calibrating the temperature influence parameters of a wind tunnel balance according to claim 1, characterized in that The six-degree-of-freedom adjustment loading head (5) comprises a central sleeve, a three-degree-of-freedom bearing assembly, and a transfer adapter; The calibrated wind tunnel balance is fixed in the central sleeve, and the three-degree-of-freedom bearing assembly includes an inner ring flange, an outer ring flange, and a U-shaped frame. The outer ring of the inner ring flange is connected to the inner ring of the outer ring flange through a bearing and can rotate relatively. The outer ring flange is connected to the two ends of the U-shaped frame through a bearing at the opposite positions on the outside in the diameter direction, and the U-shaped frame can rotate around the diameter of the outer ring flange. The central sleeve equipped with the calibrated wind tunnel balance passes through the central hole of the inner ring flange and is fixedly connected to the inner ring flange through an adapter. By replacing the adapter or using different adapter mounting holes, the relative positions of the three axial directions of the central sleeve relative to the three-degree-of-freedom bearing assembly can be adjusted. By adjusting the first worm gear reducer and the second worm gear reducer of the balance support device, the spatial attitude angle of the central sleeve and the wind tunnel balance inside it can be changed, thereby changing the angle and distance between the gravity direction and the axes of the wind tunnel balance body coordinate system, resulting in changes in the projection components of the weight gravity on the axes of the wind tunnel balance body coordinate system and the torques around the axes of the body coordinate system, that is, the six-degree-of-freedom load components.

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