Accurate repeated positioning device for movable wind tunnel test equipment and debugging method

Abstract

The invention discloses a movable wind tunnel test equipment accurate repeated positioning device and a debugging method, and belongs to the field of wind tunnel test equipment. The device comprises a front test section, a mobile test section, a rear test section, an equipment pre-positioning structure, an equipment inlet end positioning structure and an equipment outlet end positioning structure, the front test section and the rear test section are arranged on the front side and the rear side of the mobile test section respectively, and the equipment pre-positioning structure is arranged at the bottom of the mobile test section; the inlet end of the mobile test section is in positioning connection with the front test section through an equipment inlet end positioning structure, and the outlet end of the mobile test section is in positioning connection with the rear test section through an equipment outlet end positioning structure. The objective of the invention is to solve the problem of accurate and repeated positioning of the mobile wind tunnel test equipment, can bear the aerodynamic force of the wind tunnel test, is simple and reliable in structure, can achieve the function of accurate and repeated positioning of the test equipment, and can bear the aerodynamic force of the test equipment.

Description

Technical Field

[0001] The present invention relates to a precise repetitive positioning device and debugging method for a movable wind tunnel test equipment, belonging to the field of wind tunnel test equipment. Background Art

[0002] In wind tunnel tests, under the condition of having multiple identical test equipments, according to the test requirements, a suitable equipment is selected, which involves the replacement of the equipment. At the same time, there are high-precision requirements for the positioning of the equipment. For example, some wind tunnels are equipped with multiple nozzles to meet different test requirements. The positioning accuracy requirements for the nozzle and the front and rear sections are relatively high, and it is required that there is no reverse air flow step difference, and the forward air flow step difference is not greater than 0.2 mm. After the nozzle is replaced, it should be able to conveniently achieve precise repetitive positioning. The test equipment will be subjected to a large axial aerodynamic force and a lateral impact during the test, and the foundation or the equipment connected to the foundation needs to bear the aerodynamic force to fix the test equipment. In view of such a situation, there is an urgent need to propose a precise repetitive positioning device and debugging method for a movable wind tunnel test equipment, which can, through debugging, achieve the function of precise repetitive positioning of the test equipment and can bear the aerodynamic force of the test equipment. Summary of the Invention

[0003] The research and development purpose of the present invention is to solve the problem of precise repetitive positioning of the movable wind tunnel test equipment, and at the same time meet the requirement of bearing the aerodynamic force of the wind tunnel test. A brief overview of the present invention is given below to provide a basic understanding of certain aspects of the present invention. It should be understood that this overview is not an exhaustive overview of the present invention. It is not intended to identify the key or important parts of the present invention, nor is it intended to limit the scope of the present invention.

[0004] Technical Solution of the Present Invention: Solution 1: A precise repetitive positioning device for a movable wind tunnel test equipment, including a front test section, a movable test section, a rear test section, an equipment pre-positioning structure, an equipment inlet end positioning structure and an equipment outlet end positioning structure. The front test section and the rear test section are respectively arranged on the front and rear sides of the movable test section. The equipment pre-positioning structure is arranged at the bottom of the movable test section. The inlet end of the movable test section is connected to the front test section through the equipment inlet end positioning structure, and the outlet end of the movable test section is connected to the rear test section through the equipment outlet end positioning structure; The pre-positioning structure of the device includes a limit switch, a stop block, a lateral deceleration motor, a lateral rail, and lateral wheels. The lateral rail is arranged along the axial direction of the vertical movement test section. Lateral wheels are rotatably installed on the movement test section. A lateral deceleration motor is installed below the movement test section. The output end of the lateral deceleration motor is connected to the lateral wheels and drives the lateral wheels to travel on the lateral rail. A stop block is installed on the lateral rail, and a limit switch is installed on the stop block. When the lateral wheels are driven to a preset distance from the limit switch, the limit switch senses and emits a signal to control the lateral deceleration motor to stop rotating.

[0005] Preferably: The stop block is provided with an arc surface, the upper part of the arc surface is a vertical surface, the radius of the arc surface is greater than the radius of the lateral wheels, the limit switch is installed on the vertical surface and does not protrude from the vertical surface.

[0006] Preferably: The pre-positioning structure of the device further includes an axial deceleration motor, a longitudinal rail, and longitudinal wheels. The longitudinal rail is arranged along the direction parallel to the axis of the movement test section. Longitudinal wheels are rotatably installed at the bottom of the movement test section. An axial deceleration motor is installed at the bottom of the movement test section. The output end of the axial deceleration motor is connected to the longitudinal rail and drives the longitudinal wheels to travel on the longitudinal rail. The lateral deceleration motor is fixedly installed at the bottom of the longitudinal rail. The lateral wheels are rotatably installed at the bottom of the longitudinal rail. The lateral rail is vertically arranged below the longitudinal rail.

[0007] Preferably: The positioning structure at the inlet end of the device includes two limit blocks, screws, and pins. A limit block is fixedly installed on each of the left and right sides of the outlet end of the front test section through screws and pins. A continuous front alignment plane and a front adjustment inclined plane are machined on the end face of the limit block close to the inlet end of the movement test section. A continuous rear adjustment inclined plane and a rear alignment plane are machined on the end face of the inlet end of the movement test section close to the limit block. The front adjustment inclined plane and the rear adjustment inclined plane are parallel, and the front alignment plane and the rear alignment plane are in sliding fit.

[0008] Preferably: The positioning structure at the outlet end of the device includes a support, a rectangular hole, a double inclined plane pin, a lift and a deceleration motor, a lift fixing seat, and a load-bearing frame. A support is symmetrically arranged on each of the left and right sides below the outlet end of the movement test section. A rectangular hole is machined on the support. A double inclined plane pin is arranged directly below the rectangular hole. One inclined plane of the double inclined plane pin is located on the side close to the axis of the movement test section, and the other inclined plane of the double inclined plane pin faces the inlet end of the movement test section. Corresponding to the two inclined planes of the double inclined plane pin, the inner side surface at the bottom of the rectangular hole is also machined into an inclined plane aligned and parallel to the two inclined planes of the double inclined plane pin. A lift is fixedly installed at the bottom of the double inclined plane pin. The lift is connected to the deceleration motor, and the deceleration motor drives the double inclined plane pin to perform a lifting movement through the lift.

[0009] Preferably, the middle part of the double inclined plane pin is a square column, the lower part of the double inclined plane pin is a cylinder, the end of the cross-section of the cylinder is processed into a single lug, a hole is opened in the single lug, and a pin is inserted into the hole for connecting the elevator. A cylindrical hole is processed in the upper part of the elevator fixing seat. The double inclined plane pin is located in the cylindrical hole, and the side surface of the cylinder of the double inclined plane pin is in clearance fit with the cylindrical hole. The elevator fixing seat is fixedly installed on the bearing frame, and the bearing frame is fixed on the ground foundation.

[0010] Solution 2: A precise repeated debugging method for a movable wind tunnel test device is realized relying on the precise repeated positioning device for a movable wind tunnel test device described in Solution 1, and includes the following steps: Step 1, the front test section is fixedly arranged as a positioning basis, and the bottom of the rear test section is provided with a moving device, and the moving device drives the rear test section to move along the direction parallel to the axis of the front test section; Step 2, control the lateral deceleration motor to make the moving test section enter the test station along the lateral track and approach the limit switch. The limit switch senses and emits a signal. After the lateral deceleration motor receives the signal, it stops rotating, and the lateral wheels smoothly transition to the stop block. The vertical surface of the stop block completely blocks the lateral wheels, so that the moving test section stops moving, and the preliminary positioning of the moving test section is completed; Step 3, control the axial deceleration motor to make the moving test section move forward along the longitudinal track to the front test section until their end faces are in contact. During the process of the moving test section approaching the front test section, the front adjustment inclined surface of the limit block gradually guides the inlet end of the moving test section to a predetermined position to achieve secondary positioning; Step 4, when the deceleration motor drives the double inclined plane pin to rise through the elevator, the two inclined surfaces of the double inclined plane pin act simultaneously, applying a force forward and towards the middle to the device. The forward force makes the moving test section fit tightly with the front test section. The two double inclined plane pins apply a force towards the middle simultaneously to fix the outlet of the moving test section. Through the inclined surface transition of the double inclined plane pin, when the double inclined plane pin fits with the inner side wall of the rectangular hole, the double inclined plane pin can laterally position the outlet of the moving test section. At the same time, the forward force, in cooperation with the front test section in front, realizes the function of fixing the position of the moving test section in the axial direction and bears its aerodynamic load to achieve the final positioning.

[0011] The present invention has the following beneficial effects: 1. After the equipment pre-positioning structure, the equipment inlet end positioning structure and the equipment outlet end positioning structure of the present invention are debugged and positioned to meet the positioning accuracy requirements of the test equipment, when repeatedly entering the working position, the limit switch preliminarily positions the test equipment, and the deviation between the moving test section and the front test section and the rear test section can be reduced and controlled. The repeated positioning accuracy is high, the structure is simple, and the operation is convenient; 2. The positioning structure at the inlet end and the positioning structure at the outlet end of the device of the present invention further precisely adjust the lateral position of the movable test section, so that there is no reverse air flow step difference at the interfaces with the front test section and the rear test section; 3. The positioning structure at the outlet end of the device of the present invention provides a certain axial force to make the movable test section tightly attached to the front test section, thereby realizing the axial fixation of the movable test section; 4. The present invention controls the reduction motor to drive the elevator, extends the double inclined plane pin into the rectangular hole, and the side walls of the two are completely attached, so as to realize the lateral and axial positioning and load bearing of the device, with a simple, reliable and convenient operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic structural diagram of a precise repetitive positioning device for a movable wind tunnel test equipment; Figure 2 is a usage state diagram of a precise repetitive positioning device for a movable wind tunnel test equipment; Figure 3 is a mating installation diagram of a precise repetitive positioning device for a movable wind tunnel test equipment; Figure 4 is Figure 3 the B-B sectional view of; Figure 5 is a mating installation diagram of the lateral track and the lateral wheels of the present invention; Figure 6 is Figure 5 the side view of; Figure 7 is Figure 5 the top view of; Figure 8 is Figure 7 the A-A sectional view of; Figure 9 is Figure 2 the enlarged view of part Ⅰ of; Figure 10 is Figure 3 the enlarged view of part Ⅱ of; Figure 11 is Figure 3 the H-direction view of; Figure 12 is Figure 4 the C-C sectional view of; Figure 13 is Figure 12 the D-D sectional view of; Figure 14 is Figure 4 the enlarged view of part E of.

[0013] In the figure: 1 - front test section, 2 - moving test section, 3 - rear test section, 4 - limit switch, 5 - stop block, 6 - lateral deceleration motor, 7 - lateral track, 8 - lateral wheel, 9 - axial deceleration motor, 10 - longitudinal track, 11 - longitudinal wheel, 12 - limit block, 13 - pin, 14 - support, 15 - rectangular hole, 16 - double-bevel pin, 17 - elevator, 18 - deceleration motor, 19 - elevator fixing seat, 20 - load-bearing frame, 21 - rear adjustment bevel, 22 - rear alignment plane, 51 - arc surface, 52 - vertical surface, 121 - front alignment plane, 122 - front adjustment bevel. Specific embodiments

[0014] To make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be described below through specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present invention. In addition, in the following description, the descriptions of well-known structures and technologies are omitted to avoid unnecessarily confusing the concepts of the present invention.

[0015] The connections mentioned in the present invention are divided into fixed connections and detachable connections. The fixed connections are non-detachable connections, including but not limited to conventional fixed connection methods such as hemming connection, rivet connection, bonding connection and welding connection. The detachable connections include but not limited to conventional disassembly methods such as threaded connection, snap connection, pin connection and hinge connection. When the specific connection method is not clearly defined, it is defaulted that at least one connection method can always be found among the existing connection methods to achieve this function, and those skilled in the art can select according to their needs. For example: welding connection is selected for fixed connection, and hinge connection is selected for detachable connection.

[0016] Specific embodiment 1: In combination with Figures 1 - 14 Describe this embodiment. A precise repetitive positioning device for a movable wind tunnel test equipment in this embodiment includes a front test section 1, a moving test section 2, a rear test section 3, an equipment pre-positioning structure, an equipment inlet end positioning structure and an equipment outlet end positioning structure. The front test section 1 and the rear test section 3 are respectively arranged on the front and rear sides of the moving test section 2. The bottom of the moving test section 2 is provided with an equipment pre-positioning structure. The inlet end of the moving test section 2 is positioned and connected to the front test section 1 through the equipment inlet end positioning structure, and the outlet end of the moving test section 2 is positioned and connected to the rear test section 3 through the equipment outlet end positioning structure; The front test section 1 is fixedly arranged. The moving test section 2 can move along its axial direction and perpendicular to its axial direction. Considering the need to repetitively position the moving test section 2, the rear test section 3 can move along the direction parallel to the axis of the moving test section 2. After adjustment and accurate positioning, no further adjustment is required in the later stage.

[0017] The pre-positioning structure of the device includes a limit switch 4, a stop block 5, a lateral deceleration motor 6, a lateral rail 7, and lateral wheels 8. The lateral rail 7 is arranged along the axial direction of the vertical movement test section 2. Lateral wheels 8 are rotatably installed below the movement test section 2. A lateral deceleration motor 6 is installed below the movement test section 2. The output end of the lateral deceleration motor 6 is connected to the lateral wheels 8 and drives the lateral wheels 8 to travel on the lateral rail 7. A stop block 5 is installed on the lateral rail 7, and a limit switch 4 is installed on the stop block 5. When the lateral wheels 8 are driven to move to the preset distance of the limit switch 4, the limit switch 4 senses and emits a signal to control the lateral deceleration motor 6 to stop rotating.

[0018] The limit switch 4 is inductive and has an external thread. The movement test section 2 maintains a certain distance from the front test section 1 and the rear test section 3. The lateral deceleration motor 6 is controlled to enter the test station along the lateral rail 7. When installing the movement test section 2, the stop position of the movement test section 2 is manually controlled to align it with the front test section 1 and the rear test section 3. Based on this position, the position of the limit switch 4 is determined. If it is verified that the position deviation of the movement test section 2 when it stops is within the expected range, the position of the limit switch 4 is considered appropriate.

[0019] The stop block 5 is provided with an arc surface 51. The radius of the arc surface 51 is greater than the radius of the lateral wheels 8. The arc surface 51 of the stop block 5 is tangent to the lateral rail 7. The lateral wheels 8 can smoothly transition to the arc surface 51 of the stop block 5. As the movement test section 2 moves further, the resistance on the arc surface 51 gradually increases. Above the arc surface 51 is a vertical surface 52, and the vertical surface 52 completely blocks the movement of the movement test section 2. The limit switch 4 is installed on the vertical surface 52 and does not protrude from the vertical surface 52. That is, a threaded hole is opened on the vertical surface 52 of the stop block 5, and the limit switch 4 is directly screwed into the threaded hole without being exposed. When the lateral wheels 8 contact the vertical surface 52, they will not hit the limit switch 4. In addition to being used for installing the limit switch 4, the stop block 5 also serves to prevent the movement test section 2 from continuing to move after the limit switch 4 fails.

[0020] The pre-positioning structure of the device further includes an axial deceleration motor 9, a longitudinal rail 10, and longitudinal wheels 11. The longitudinal rail 10 is arranged along the direction parallel to the axis of the movement test section 2. Longitudinal wheels 11 are rotatably installed at the bottom of the movement test section 2. An axial deceleration motor 9 is installed at the bottom of the movement test section 2. The output end of the axial deceleration motor 9 is connected to the longitudinal rail 10 and drives the longitudinal wheels 11 to travel on the longitudinal rail 10. The lateral deceleration motor 6 is fixedly installed at the bottom of the longitudinal rail 10. The lateral wheels 8 are rotatably installed at the bottom of the longitudinal rail 10. The lateral rail 7 is vertically arranged below the longitudinal rail 10.

[0021] The positioning structure at the inlet end of the device includes two limit blocks 12, screws, and a pin 13. On the left and right sides of the outlet end of the front test section 1, a limit block 12 is fixedly installed through screws and the pin 13 respectively. On one side end face of the limit block 12 close to the inlet end of the moving test section 2, a continuous front alignment plane 121 and a front adjustment inclined plane 122 are machined. On one side end face of the inlet end of the moving test section 2 close to the limit block 12, a continuous rear adjustment inclined plane 21 and a rear alignment plane 22 are machined. The front adjustment inclined plane 122 and the rear adjustment inclined plane 21 are parallel and a certain spacing is reserved. This spacing needs to be greater than the deviation of the inductive positioning of the limit switch 4. The front alignment plane 121 and the rear alignment plane 22 are in sliding fit. During the process of the moving test section 2 approaching the front test section 1 along the axial direction, the front adjustment inclined plane 122 and the rear adjustment inclined plane 21 gradually guide the inlet end of the moving test section 2 to a predetermined position.

[0022] When installing the limit block 12, control the axial deceleration motor 9 to make the moving test section 2 move forward along the longitudinal track 10 towards the front test section 1 until their end faces are in contact. Fine-tune the interface between the moving test section 2 and the front test section 1 to make the step difference of the left and right two sides of their end faces uniform. Taking the upper and lower sides of the front test section 1 as the reference, the height of the moving test section 2 can be adjusted by methods such as adding gaskets to make the deviation of their upper and lower sides uniform. Taking this state as the reference, install and fix the two limit blocks 12 to ensure that the front alignment plane 121 of the limit block 12 and the rear alignment plane 22 of the moving test section 2 are in good contact.

[0023] The positioning structure at the outlet end of the device includes a support 14, a rectangular hole 15, a double inclined plane pin 16, a lift 17, a deceleration motor 18, a lift fixing seat 19, and a load-bearing frame 20. On the left and right sides symmetrically below the outlet end of the moving test section 2, a support 14 is provided. A rectangular hole 15 is machined on the support 14. The double inclined plane pin 16 is arranged directly below the rectangular hole 15. One inclined plane of the double inclined plane pin 16 is on the side close to the axis of the moving test section 2, and the other inclined plane of the double inclined plane pin 16 faces the inlet end of the moving test section 2. Corresponding to the two inclined planes of the double inclined plane pin 16, the inner side surface at the bottom of the rectangular hole 15 is also machined into inclined planes aligned and parallel to the two inclined planes of the double inclined plane pin 16. The lift 17 is fixedly installed at the bottom of the double inclined plane pin 16. The lift 17 is connected to the deceleration motor 18, and the deceleration motor 18 drives the double inclined plane pin 16 to make a lifting motion through the lift 17. During installation, when the position of the 2# test equipment 2 is adjusted and the inlet end is accurately positioned and in contact with the front test section 1, the position of the double inclined plane pin 16 is positioned and adjusted. The lifting of the double inclined plane pin 16 is driven by the lift 17 and the supporting deceleration motor 18.

[0024] The middle part of the double bevel pin 16 is a square column, and the lower part of the double bevel pin 16 is a cylinder. The end of the cross-section of the cylinder is processed into a single lug, and a hole is drilled in the single lug. A pin is inserted into the hole for connecting the double lugs at the lever end of the elevator 17. A cylindrical hole is processed in the upper part of the elevator fixing seat 19. The double bevel pin 16 is located in the cylindrical hole. There is a clearance fit between the cylindrical side surface of the double bevel pin 16 and the cylindrical hole. The elevator fixing seat 19 is fixedly installed on the load-bearing frame 20, and the load-bearing frame 20 is fixed on the ground foundation.

[0025] Specific implementation method 2: Combining Figures 1 - 14 To illustrate this implementation method, a precise repetitive debugging method for a movable wind tunnel test device in this implementation method is realized relying on the precise repetitive positioning device for a movable wind tunnel test device described in Specific implementation method 1, and includes the following steps: Step 1, the front test section 1 is fixedly arranged as the positioning basis. The bottom of the rear test section 3 is provided with a moving device, and the moving device drives the rear test section 3 to move along the direction parallel to the axis of the front test section 1. Step 2, control the lateral deceleration motor 6 to make the moving test section 2 enter the test station along the lateral track 7 and approach the limit switch 4. The limit switch 4 senses and emits a signal. After receiving the signal, the lateral deceleration motor 6 stops rotating, and the lateral wheels 8 smoothly transition to the stop block 5. The vertical surface of the stop block 5 completely blocks the lateral wheels 8, so that the moving test section 2 stops moving, completing the preliminary positioning of the moving test section 2. Step 3, control the axial deceleration motor 9 to make the moving test section 2 move forward along the longitudinal track 10 towards the front test section 1 until their end faces are in contact. During the process of the moving test section 2 approaching the front test section 1, the front adjustment inclined surface 122 of the limit block 12 gradually guides the inlet end of the moving test section 2 to a predetermined position, realizing secondary positioning.

[0026] Step 4, when the deceleration motor 18 drives the double bevel pin 16 to rise through the elevator 17, the two inclined surfaces of the double bevel pin 16 act simultaneously, applying a force to the device forward and towards the middle. The forward force makes the moving test section 2 fit tightly with the front test section 1. The two double bevel pins 16 apply a force towards the middle simultaneously to fix the outlet of the moving test section 2. Through the inclined surface transition of the double bevel pin 16, when the double bevel pin 16 fits with the inner side wall of the rectangular hole 15, the double bevel pin 16 can laterally position the outlet of the moving test section 2. At the same time, the forward force, in cooperation with the front test section 1 in front, realizes the function of fixing the position of the moving test section 2 in the axial direction and bears its aerodynamic load, realizing the final positioning.

[0027] It should be noted that in the above embodiments, as long as the technical solutions are not contradictory, they can be permuted and combined. Those skilled in the art can exhaust all possibilities based on the mathematical knowledge of permutation and combination. Therefore, the present invention will not describe the technical solutions after permutation and combination one by one, but it should be understood that the technical solutions after permutation and combination have been disclosed by the present invention.

[0028] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A precise and repeated positioning device for a movable wind tunnel test equipment, characterized in that: The invention comprises a front test section (1), a mobile test section (2), a rear test section (3), a device pre-positioning structure, a device inlet end positioning structure and a device outlet end positioning structure, wherein the front test section (1) and the rear test section (3) are respectively arranged on the front and rear sides of the mobile test section (2), the bottom of the mobile test section (2) is provided with the device pre-positioning structure, the inlet end of the mobile test section (2) is connected to the front test section (1) via the device inlet end positioning structure, and the outlet end of the mobile test section (2) is connected to the rear test section (3) via the device outlet end positioning structure; The equipment pre-positioning structure comprises a limit switch (4), a stopper (5), a transverse reduction motor (6), a transverse track (7) and a transverse wheel (8), wherein the transverse track (7) is arranged along the axial direction of the vertical moving test section (2), a transverse wheel (8) is rotatably mounted below the moving test section (2), a transverse reduction motor (6) is mounted on the moving test section (2), an output end of the transverse reduction motor (6) is connected to the transverse wheel (8), and drives the transverse wheel (8) to move on the transverse track (7), a stopper (5) is mounted on the transverse track (7), and a limit switch (4) is mounted on the stopper (5), and when the transverse wheel (8) is driven to move to a preset distance of the limit switch (4), the limit switch (4) senses and sends a signal to control the transverse reduction motor (6) to stop rotating.

2. The precise and repeated positioning device for movable wind tunnel test equipment according to claim 1, characterized in that: The stopper (5) is provided with an arc surface (51), the upper side of the arc surface (51) is a vertical surface (52), the radius of the arc surface (51) is greater than the radius of the transverse wheel (8), and the limit switch (4) is mounted on the vertical surface (52) and does not protrude from the vertical surface (52).

3. The precise and repeated positioning device for movable wind tunnel test equipment according to claim 2, characterized in that: The equipment pre-positioning structure also includes an axial reduction motor (9), a longitudinal track (10) and a longitudinal wheel (11), wherein the longitudinal track (10) is arranged in a direction parallel to the axis of the moving test section (2), the longitudinal wheel (11) is rotatably mounted at the bottom of the moving test section (2), the axial reduction motor (9) is mounted at the bottom of the moving test section (2), the output end of the axial reduction motor (9) is connected to the longitudinal track (10), and drives the longitudinal wheel (11) to move and transport on the longitudinal track (10), the transverse reduction motor (6) is fixedly mounted at the bottom of the longitudinal track (10), the transverse wheel (8) is rotatably mounted at the bottom of the longitudinal track (10), and the transverse track (7) is vertically arranged below the longitudinal track (10).

4. The precise and repeated positioning device for movable wind tunnel test equipment according to claim 3, characterized in that: The device inlet end positioning structure comprises two limit blocks (12), screws and pins (13); a limit block (12) is fixedly installed on the left and right sides of the outlet end of the front test section (1) by means of screws and pins (13); a continuous front alignment plane (121) and a front adjustment inclined plane (122) are machined on the end surface of one side of the limit block (12) close to the inlet end of the moving test section (2); a continuous rear adjustment inclined plane (21) and a rear alignment plane (22) are machined on the end surface of one side of the inlet end of the moving test section (2) close to the limit block (12); the front adjustment inclined plane (122) and the rear adjustment inclined plane (21) are parallel, and the front alignment plane (121) and the rear alignment plane (22) are slidably fitted.

5. The precise and repeated positioning device for movable wind tunnel test equipment according to claim 4, characterized in that: The equipment outlet end positioning structure comprises a support (14), a rectangular hole (15), a double bevel pin (16), an elevator (17), a reduction motor (18), an elevator fixing seat (19) and a load-bearing frame (20), wherein a support (14) is symmetrically arranged on the left and right sides below the outlet end of the mobile test section (2), a rectangular hole (15) is processed on the support (14), and a double bevel pin (16) is arranged directly below the rectangular hole (15), and one bevel of the double bevel pin (16) is located close to the mobile test section. On one side of the axis of the test section (2), the other inclined surface of the double-bevel pin (16) faces the entrance end of the movable test section (2). Corresponding to the two inclined surfaces of the double-bevel pin (16), the inner side surface of the bottom of the rectangular hole (15) is also processed into an inclined surface that is aligned and parallel to the two inclined surfaces of the double-bevel pin (16). A lifter (17) is fixedly installed at the bottom of the double-bevel pin (16). The lifter (17) is connected to a reduction motor (18). The reduction motor (18) drives the double-bevel pin (16) to perform lifting and lowering movements through the lifter (17).

6. The precise and repeated positioning device for movable wind tunnel test equipment according to claim 5, characterized in that: The middle part of the double bevel pin (16) is a square column, the lower part of the double bevel pin (16) is a cylinder, the cross-sectional end of the cylinder is processed into a single ear piece, a hole is opened on the single ear piece, and the pin is inserted into the hole for connecting the elevator (17), a cylindrical hole is processed on the upper part of the elevator fixing seat (19), the double bevel pin (16) is located in the cylindrical hole, the cylindrical side surface of the double bevel pin (16) and the cylindrical hole are clearance-matched, the elevator fixing seat (19) is fixedly mounted on the load-bearing frame (20), and the load-bearing frame (20) is fixed on the ground foundation.

7. A method for accurate and repeated debugging of a movable wind tunnel test equipment, which is realized by relying on the accurate and repeated positioning device for movable wind tunnel test equipment according to claim 6, characterized in that: The following steps are involved: Step 1, the front test section (1) is fixedly arranged as a positioning basis, and a mobile device is provided at the bottom of the rear test section (3), and the mobile device drives the rear test section (3) to move in a direction parallel to the axis of the front test section (1); Step 2, control the transverse reduction motor (6) so that the mobile test section (2) enters the test station along the transverse track (7) and approaches the limit switch (4). The limit switch (4) senses and sends a signal. After receiving the signal, the transverse reduction motor (6) stops rotating, and the transverse wheel (8) smoothly transitions to the stopper (5). The vertical surface of the stopper (5) completely blocks the transverse wheel (8), so that the mobile test section (2) stops moving, and the preliminary positioning of the mobile test section (2) is completed; Step 3, controlling the axial reduction motor (9) to move the movable test section (2) along the longitudinal track (10) toward the front test section (1) until the end faces of the two sections are in contact with each other. In the process of the movable test section (2) approaching the front test section (1), the front adjustment inclined surface (122) of the limit block (12) gradually guides the entrance end of the movable test section (2) to a predetermined position, thereby realizing secondary positioning; Step 4, when the reduction motor (18) drives the double bevel pin (16) to rise through the elevator (17), the two bevels of the double bevel pin (16) act simultaneously to apply a force to the device forward and to the middle. The forward force makes the movable test section (2) fit tightly with the front test section (1). The two double bevel pins (16) simultaneously apply a force to the middle to fix the outlet of the movable test section (2). The bevels of the double bevel pins (16) transition to the inner wall of the double bevel pins (16) and the rectangular hole (15). The double bevel pins (16) can laterally position the outlet of the movable test section (2). At the same time, the forward force cooperates with the front test section (1) in front to achieve the function of fixing the position of the movable test section (2) in the axial direction, and bear its aerodynamic load to achieve the final positioning.

Images