A replacement device for a large high-speed wind tunnel model support mechanism and a replacement method thereof

Abstract

The application discloses a large-scale high-speed wind tunnel model support mechanism replacement device and a replacement method thereof, and aims to solve the problems that the current device for model support mechanism replacement has large overall quality, high control difficulty, and cannot realize fine position control and the like. The device comprises a middle support support plate, a support assembly for providing support for the middle support support plate, a baffle, a lifting adjusting device, and a connecting assembly. The support assembly comprises universal wheels, a bottom plate, a vertical plate, and inclined rods. The universal wheels are arranged below the bottom plate and can drive the bottom plate to move. The vertical plate is arranged on the bottom plate and the bottom plate can provide support for the vertical plate. The two ends of the inclined rods are connected with the bottom plate and the vertical plate respectively, and the inclined rods, the bottom plate and the vertical plate are arranged in a triangular shape. The application can realize quick replacement of the model support mechanism and greatly improve work efficiency. Meanwhile, the application can consider the replacement work of various configuration model support mechanisms and has good adaptability.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of aerospace wind tunnel test, in particular to a large high-speed wind tunnel model support mechanism replacement device and its replacement method. The present application can realize the rapid replacement of the model support mechanism, improve the work efficiency, and the replacement device has high adaptability, which can consider the replacement work of model support mechanisms of various configurations. BACKGROUND

[0002] Wind tunnel test is mainly implemented according to the principle of relative motion, that is, compared with actual flight, the aircraft moves at a certain speed in a relatively static atmospheric environment; in the wind tunnel test, the aircraft model is usually installed on a fixed support mechanism, and the airflow upstream of the model flows through the model at a certain speed. The change of the attitude angle of the model relative to the wind tunnel flow can be realized by the movement of the model support mechanism.

[0003] Figure 1 The model support device commonly used in the current high-speed wind tunnel is shown. The basic structure of the model support device is in the form of a curved knife, which is divided into three parts: an upper support, a middle support and a lower support. The middle support is located in the wind tunnel flow field environment, and the model is connected to the middle support through a support rod. The middle support is connected to the upper support and the lower support through screws and pins, respectively, to connect the three parts into a whole. The movement control mechanism drives the piston rod connected to the upper support to perform extension and retraction movement, so that the entire model support device moves along the circular arc guide rail installed on the test section frame, thereby realizing the change of the model pitch angle. Since the model is mainly supported in the wind tunnel through the middle support, the replacement of the model support mechanism mainly refers to the replacement of the middle support, and the upper support and the lower support are generally not replaced. Figure 2 The structure diagram of the middle support is given, which can be seen that: the connection surfaces of the middle support, the upper support and the lower support adopt a stepped lap joint manner; in order to ensure that the model support mechanism has a small cross-sectional area to reduce its blocking effect on the airflow, except that the middle section of the middle support for model support and related cable layout adopts a slightly larger cylindrical structure, the rest adopts a blade structure. At the same time, the upper support and the middle support are connected by pins and screws, and the screws are divided into two rows, one row of screw holes is threaded on the upper support, and the other row of screw holes is threaded on the middle support. The connection between the lower support and the middle support is similar.

[0004] Because different types of wind tunnel tests have different requirements for model support, different middle supports need to be replaced. For example, the middle support requires a large airflow passage in the middle section to achieve a large range of throttle adjustment capability to adjust the inlet flow. The conventional force test often requires the installation of a mechanical structure with roll in the middle section of the middle support to achieve the change of the model lateral angle by cooperating with the pitch angle movement control capability of the model support mechanism.

[0005] On the one hand, the middle support is exposed to the wind tunnel airflow environment for a long time and repeatedly subjected to the impact of aerodynamic load. On the other hand, in order to avoid the interference of the middle support with the flow near the model, the distance between the model and the middle support should be as far as possible, which results in that the aerodynamic load borne by the model will bring a large additional torque to the middle support. Therefore, the middle support needs to have sufficient strength and stiffness, so that its own weight is often large. For wind tunnels with a size of more than 1 meter, the middle support cannot be replaced and installed by manpower, and must be replaced and installed by a special device.

[0006] The current device for replacing the model support mechanism has the structure as shown in Figures 3-5 ; wherein 1 is a universal wheel, 2 is a base, 3 is a left bottom plate, 4 is a guide rail, 5 is a left connecting plate, 6 is a right connecting plate, and 7 is a right bottom plate. In this structure, the universal wheel is installed below the base to realize the overall movement of the device; the base is slotted in the middle to allow the middle support to be inserted therein; the guide rail is installed on the base, and the left connecting plate and the right connecting plate placed on the guide rail can move along the direction of the guide rail; the left connecting plate and the right connecting plate installed on the left bottom plate and the right bottom plate have certain height adjustment capability to align the screw hole positions on the connecting plates with the hole positions of the middle support. The left connecting plate is mainly used to temporarily connect the upper support and the lower support when the current middle support is removed and the new middle support is not installed in place; if there is no left connecting plate, after the middle support is removed, the lower support will be in an uncontrolled state and will slide down along the guide rail under its own weight, which will cause serious accidents. Even if it does not slide much, it will also cause the lower support to have a significant positional deviation from the new middle support after the new middle support is in place, and thus cannot be connected. The right connecting plate is mainly used to connect the middle support and the device as a whole after the middle support is disconnected from the upper support and the lower support, and then transport it to the outside of the tunnel for middle support replacement.

[0007] The steps for replacing the middle support using the device are as follows:

[0008] 1. Remove the positioning pins connecting the middle support with the upper support and the lower support, respectively;

[0009] 2. Adjust the position of the universal wheel adjusting device so that the slot of the base is aligned with the middle support as much as possible to reduce the subsequent adjustment workload of the left and right connecting plates along the guide rail direction;

[0010] 3. Push the device into the position of the middle support so that the middle support is located in the slot of the base;

[0011] 4. Adjust the position of the device along the axis of the wind tunnel so that the screw hole positions on the connecting plates are consistent with the screw hole positions of the upper and lower supports in the axial direction;

[0012] 5. Remove the upper and lower rows of screws used for connecting the supports, which are closer to the center line of the middle support. The screw cap positions of these two rows of screws are located in the middle support, and the threaded positions are located in the upper and lower supports, respectively, which can meet the needs of connecting the left connecting plate to the upper and lower supports through screws;

[0013] 6. Adjust the height of the left connecting plate so that the screw hole positions on the connecting plate are consistent with the screw hole positions of the upper and lower supports;

[0014] 7. Adjust the position of the left connecting plate on the guide rail so that the connecting plate is as close as possible to the upper and lower supports;

[0015] 8. Connect the upper support, left connecting plate, and lower support into one body using screws;

[0016] 9. Remove the upper and lower rows of screws used for connecting the supports, which are far away from the center line of the middle support. The screw cap positions of these two rows of screws are located in the upper and lower supports, respectively, and the threaded positions are located in the middle support, which can meet the needs of connecting the right connecting plate to the middle support through screws;

[0017] 10. Adjust the position of the right connecting plate on the guide rail so that the right connecting plate is as close as possible to the middle support;

[0018] 11. Connect the middle support and the right connecting plate into one body using screws. It should be noted that due to the design of a series of mechanisms for adjusting the height, strengthening the strength and stiffness near the right bottom plate below the right connecting plate, interference is easy to occur, so the screw hole position connected with the screw hole below the middle support is not designed, that is, the middle support and the right connecting plate are connected by the upper row of screw holes;

[0019] 12. Adjust the position of the right connecting plate on the guide rail to move upward so that the middle support is detached from its installation position;

[0020] 13. Move the device as a whole to a relatively open space;

[0021] 14. Use the crane to remove the middle support from the device and hoist the middle support that needs to be replaced to the vicinity of the device;

[0022] 15. Adjust the position of the device and the trolley, align the screw hole positions of the new middle support and the right connecting plate, and connect them with screws. Note that due to the inability of the trolley to achieve precise adjustment, this step often requires repeated adjustment, and sometimes even requires connecting some of the screws first before adjusting the position to finally achieve the connection of all the screws;

[0023] 16. Adjust the position of the device through the universal wheel to make the slot position of the device as close as possible to the installation position of the middle support, so as to reduce the subsequent position adjustment work of the middle support;

[0024] 17. Push the device into the planned installation position of the new middle support;

[0025] 18. Adjust the position of the device along the axis of the wind tunnel to make the axial position of the middle support consistent with its planned installation position;

[0026] 19. Adjust the position of the right connecting plate on the guide rail and the height position of the right connecting plate to gradually make the new middle support enter its planned installation position;

[0027] 20. As mentioned earlier, the middle support and the right connecting plate are not connected by screws below, so adjust the height position of the right connecting plate to make the pin hole of the middle support and the lower support align, and the connecting screw hole positions of the middle support and the lower support away from the middle line of the middle support align, respectively use the pin and the screw to connect the middle support and the lower support, at this time the lower support and the new middle support are basically connected as a whole;

[0028] 21. Since the upper support is connected to the driving device of the model support device, the upper support will not be out of control, so after connecting the left connecting plate with the left bottom plate, loosen the connecting screws of the left connecting plate with the upper support and the lower support, and adjust the position of the left connecting plate on the guide rail to make it away from the middle support, so as to provide enough operation space for the subsequent installation of the screws;

[0029] 22. Adjust the height position of the right connecting plate to make the pin hole of the middle support and the upper support align, and then punch the pin, at this time the upper support, the new middle support and the lower support are basically connected as a whole;

[0030] 23. Install the screws near the middle line of the new middle support for connecting the middle support with the upper support and the lower support;

[0031] 24. Take out the connecting screws of the right connecting plate and the middle support, and use them to connect the middle support and the upper support;

[0032] 25. Adjust the position of the right connecting plate on the guide rail to make it away from the middle support;

[0033] 26. The entire device is moved out of the area where the middle support is located, and at this point, the entire model support mechanism replacement work is completed.

[0034] The current device for model support mechanism replacement mainly has the following problems.

[0035] Firstly, the entire device has a large weight, which makes it difficult to control the position of the entire device, especially the fine position control. The large weight of the entire device mainly comes from the following aspects: 1) the device contains large-size components; 2) the left and right connecting plates have large sizes. For a 2-meter wind tunnel, the middle support is almost the same height as the test section. Therefore, whether it is the left connecting plate connecting the upper and lower supports or the right connecting plate connecting the middle support, the height size is more than 1 meter. In order to ensure the connection of all screws, the width of the connecting plate is also basically the same as the middle support, which is also more than 1 meter.

[0036] Secondly, when the middle support is connected to the device, the center of gravity of the device is relatively high. In order to ensure that the high center of gravity does not cause the entire device to overturn, the distance between the four universal wheels as support points should be as large as possible, which results in a large size of the entire base. Since these large-size components are the main load-bearing components, they cannot be reduced in weight, and in many positions they have to be additionally reinforced, which results in a large weight of these components. In addition, the device is designed with multiple multi-degree-of-freedom adjustment devices, which have limited load bearing capacity. In order to ensure that the components installed on them do not have problems when bearing the large weight structure of the middle support, additional reinforcement ribs and other structures have to be designed, increasing the additional weight. The problem caused by the large weight is that, although there are universal wheels, the entire device is very difficult to control in motion (especially in fine position control), and the following situations often occur: when the device is difficult to insert into the position where the middle support is located, it is found that the position is not suitable, and the device cannot be finely adjusted in position, so the device has to be withdrawn as a whole, and then re-adjusted and pushed in again. Such repeated adjustments increase the workload and make the replacement of the middle support less efficient.

[0037] Further, in order to not interfere with the connection of the left connecting plate to the upper and lower supports through the two rows of screws, the height of the base as the basis of the entire device is small. As mentioned earlier, the middle support occupies most of the height of the test section, that is, the height of the base from the lower wall plate may be only 200-300 mm, and the center of gravity of the device is also relatively low. When the left connecting plate connecting the upper and lower supports is disconnected from the device, and the right connecting plate connecting the middle support is connected, if the middle support tilts, due to the large distance between the center of gravity of the middle support and the center of gravity of the device in the height direction, a large additional torque may be generated, causing the entire device to overturn, seriously affecting the safety of personnel and equipment.

[0038] Again, whether the left connecting plate is connected with the upper support and the lower support when the middle support is removed, or the right connecting plate is connected with the middle support, or the new middle support is connected with the right connecting plate, alignment operation of multiple screw hole positions is required, which is very difficult for devices lacking precise position control. This requires repeated adjustment of each mechanism, which not only tests the experience of the staff, but also is a very time-consuming and labor-consuming work.

[0039] Finally, the current device has poor versatility. The screw hole positions of the middle support of different test sections may be different, so the device needs to be designed to match the left connecting plate and the right connecting plate, otherwise it cannot meet the replacement requirements. In addition, for the model support device of the half-bent knife structure (compared to the model support mechanism shown in the figure, the model support mechanism of the half-bent knife form is similar to only including the part below the middle section of the middle support, the driving device is connected with the lower support, and the lower support moves along the circular arc guide rail), the current device cannot be used. Figure 1

[0040] Therefore, there is an urgent need for a new structure and / or device to solve one of the above problems. SUMMARY

[0041] As described above, the current device for replacing the model support mechanism has the problems of large overall quality, high control difficulty, inability to achieve fine position control; when the middle support is connected with the device, the center of gravity of the device is high, in order to avoid the problem of overturning caused by the center of gravity, a large size base needs to be used, and the replacement efficiency of the middle support is low; when the right connecting plate is connected with the middle support, the center of gravity of the middle support and the center of gravity of the device have a large distance in the height direction, which is likely to generate a large additional torque, so that the whole device is in danger of overturning, and has a large safety hazard; the versatility of the device is poor, and the application range is limited.

[0042] In view of one of the above problems, the present application provides a replacement device for a large-scale high-speed wind tunnel model support mechanism and a replacement method thereof. The present application can realize the rapid replacement of the model support mechanism, and greatly improve the work efficiency. At the same time, the present application can consider the replacement work of various configurations of the model support mechanism, and has good adaptability.

[0043] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0044] A replacement device for a large-scale high-speed wind tunnel model support mechanism, comprising a middle support support plate, a support assembly for providing support for the middle support support plate, a baffle, a lifting adjusting device, and a connecting assembly.

[0045] ​The support assembly comprises a universal wheel, a bottom plate, a vertical plate, and an inclined rib. The universal wheel is arranged below the bottom plate and can drive the bottom plate to move. The vertical plate is arranged on the bottom plate and can be supported by the bottom plate. The two ends of the inclined rib are connected with the bottom plate and the vertical plate, respectively, and the inclined rib, the bottom plate, and the vertical plate are arranged in a triangular shape.

[0046] The middle support support plate is in the shape of a V. A strip-shaped groove is arranged on the middle support support plate and cooperates with the middle support. The middle support can be placed on or removed from the middle support support plate through the strip-shaped groove.

[0047] The baffle is connected with the middle support support plate and can rotate relative to the middle support support plate to open or close the strip-shaped groove on the middle support support plate. The lifting adjusting device is arranged on the middle support support plate and can adjust the position of the middle support placed on the middle support support plate in the vertical direction.

[0048] The support assembly is four. The connecting assembly comprises a first reinforcing rib and a second reinforcing rib. The first reinforcing rib is a group arranged along the axial direction of the strip-shaped groove on the middle support support plate. The two ends of the first reinforcing rib are connected with the support assembly, respectively. Along the direction perpendicular to the axial direction of the strip-shaped groove on the middle support support plate, the second reinforcing rib is a group. The two ends of the second reinforcing rib are connected with the support assembly, respectively. The projection of the first reinforcing rib and the second reinforcing rib in the vertical direction is a quadrilateral.

[0049] The support assembly is arranged below the four vertices of the middle support support plate, respectively. The four support assemblies can support the middle support support plate and drive the middle support support plate to move.

[0050] The width of the strip-shaped groove of the middle support support plate is greater than the thickness of the middle support blade. The width of the strip-shaped groove of the middle support support plate is less than the maximum cross-sectional width of the middle support.

[0051] The length of the strip-shaped groove of the middle support support plate is greater than the length of the middle support.

[0052] The universal wheel is a Mecanum wheel.

[0053] The vertical plate is arranged vertically on the bottom plate. The inclined rib, the bottom plate, and the vertical plate are arranged in a right triangle.

[0054] The first reinforcing rib is a group. The first reinforcing ribs are arranged parallel to each other. The second reinforcing rib is a group. The second reinforcing ribs are arranged parallel to each other.

[0055] The axial direction of the first reinforcing rib is perpendicular to the axial direction of the second reinforcing rib. The projection of the first reinforcing rib and the second reinforcing rib in the vertical direction is a rectangle.

[0056] The four vertices of the middle support plate are arranged at the top end of the vertical plate of the support assembly, and the support assembly can provide support for the middle support plate.

[0057] The middle support plate comprises a middle first support, a middle first connecting piece and a middle second support, the middle first support and the middle second support are parallel to each other, the middle first support and the middle first connecting piece are perpendicular to each other, the middle first support, the middle first connecting piece and the middle second support are sequentially connected and arranged in a V shape, and a strip-shaped groove is formed between the middle first support, the middle first connecting piece and the middle second support.

[0058] The length of the strip-shaped groove of the middle support plate is 1.05-2.0 times the length of the middle support.

[0059] The replacement method using the replacement device comprises the following steps:

[0060] (1) Take out the positioning pins connecting the middle support with the upper support and the lower support respectively;

[0061] (2) Adjust the position of the replacement device so that the strip-shaped groove of the middle support plate is aligned with the middle support as much as possible;

[0062] (3) Open the baffle and push the replacement device into the position of the middle support;

[0063] (4) Adjust the spatial position of the replacement device by controlling the universal wheel so that the middle support is located in the middle position of the replacement device as much as possible after falling;

[0064] (5) Take out the connecting screw of the middle support and the lower support; to prevent the lower support from freely falling due to loss of control after the middle support is detached, use a removed screw to pass through the middle screw hole with threads located in the lower support and an axis located in the middle of the lower support, and ensure that the screw rod does not extend into the middle support, otherwise the middle support cannot be taken out, and the part not passing through is supported by a jack to realize that the position between the lower support and the lower wall plate does not fall due to the detachment of the middle support;

[0065] (6) Use a removed screw to pass through the middle screw hole with threads located in the middle support and an axis located in the middle of the middle support, and ensure that the screw rod does not extend into the lower support, and the part not passing through is connected with the lifting adjusting device;

[0066] (7) Take out the connecting screw of the middle support and the upper support;

[0067] (8) Control the extension amount of the lifting adjusting device to slowly drop the middle support onto the middle support plate of the replacement device;

[0068] (9) The strip-shaped slot of the middle support support plate is connected to the left and right ends by the baffle, which can ensure that the middle support support plate is deformed by force and can also avoid the overturning of the middle support in the pitch direction to a certain extent;

[0069] (10) The spatial position of the replacement device is adjusted by controlling the universal wheel, so that the middle support is appropriately moved horizontally away from the axis position of the upper support and the lower support in the wind tunnel, thereby avoiding interference with the upper support and the lower support when the replacement device is withdrawn;

[0070] (11) The replacement device and the middle support are withdrawn from the position of the model support mechanism to a wide space;

[0071] (12) The middle support is removed from the replacement device by using the crane, and the middle support to be installed is placed on the replacement device;

[0072] (13) The spatial position of the replacement device is adjusted by controlling the universal wheel, so that the middle support is aligned with the planned installation position as much as possible, thereby reducing the workload of adjusting the position of the middle support in the limited space after reaching the expected installation position;

[0073] (14) The spatial position of the replacement device is adjusted by controlling the universal wheel, and the height position of the middle support is adjusted by using the lifting adjusting device, so that the pin hole and screw hole positions of the middle support and the upper support are aligned;

[0074] (15) The upper support and the middle support are connected by using the pin and the screw;

[0075] (16) The pin hole and screw hole positions of the middle support and the lower support are aligned by adjusting the extension amount of the jack;

[0076] (17) The middle support and the lower support are connected by using the pin and the screw;

[0077] (18) The device is moved out of the area where the middle support is located;

[0078] At this point, the replacement work of the entire model support mechanism is completed.

[0079] In view of the foregoing, the application provides a replacement device for a large high-speed wind tunnel model support mechanism and a replacement method thereof. The replacement device comprises a middle support bracket support plate, a support assembly for providing support for the middle support bracket support plate, a baffle, a lifting adjustment device, and a connecting assembly. The support assembly comprises universal wheels, a bottom plate, a vertical plate, and inclined rods. The universal wheels are arranged below the bottom plate and can drive the bottom plate to move. The vertical plate is arranged on the bottom plate and the bottom plate can provide support for the vertical plate. The two ends of the inclined rods are connected to the bottom plate and the vertical plate, respectively, and the inclined rods, the bottom plate, and the vertical plate are arranged in a triangular shape. In the application, the bottom plate, the vertical plate, and the inclined rods are welded together to form an integral whole, which serves as a support (support assembly) of the entire device. Each support has a Mecanum wheel installed at the bottom, and the replacement device has four support assemblies.

[0080] Further, the support assemblies are located below the four vertices of the middle support bracket support plate and can provide support for the middle support bracket support plate and drive the middle support bracket support plate to move. The four vertices of the middle support bracket support plate are arranged at the top ends of the vertical plates of the support assemblies, and the support assemblies can provide support for the middle support bracket support plate. That is, the four supports are installed at the four corner positions of the middle support bracket support plate.

[0081] Further, the middle support bracket support plate has a V-shaped structure, and a strip-shaped groove is arranged on the middle support bracket support plate to cooperate with the middle support bracket. That is, the middle of the middle support bracket support plate is a slotted structure. With this structure, the middle support bracket can be placed on the middle support bracket support plate through the strip-shaped groove or removed from the middle support bracket support plate.

[0082] Meanwhile, the connecting assembly comprises first reinforcing rods and second reinforcing rods. The first reinforcing rods are arranged in a group along the axial direction of the strip-shaped groove on the middle support bracket support plate, and the two ends of each first reinforcing rod are connected to the support assemblies. The second reinforcing rods are arranged in a group along a direction perpendicular to the axial direction of the strip-shaped groove on the middle support bracket support plate, and the two ends of each second reinforcing rod are connected to the support assemblies. The projections of the first reinforcing rods and the second reinforcing rods along the vertical direction form a quadrilateral. Preferably, the first reinforcing rods are arranged in a group and parallel to each other, and the second reinforcing rods are arranged in a group and parallel to each other. The axial direction of the first reinforcing rods is perpendicular to the axial direction of the second reinforcing rods, and the projections of the first reinforcing rods and the second reinforcing rods along the vertical direction form a rectangle. In the application, the first reinforcing rods are used to connect the two supports in the slotting direction to increase the strength of the device in the slotting direction. The second reinforcing rods are used to connect the two supports in the range not subjected to slotting to increase the lateral strength of the device.

[0083] In the application, the baffle is connected with the middle support support plate, and the baffle can rotate relative to the middle support support plate to realize the opening or closing of the strip-shaped slot on the middle support support plate. The lifting adjusting device is arranged on the middle support support plate, and the lifting adjusting device can adjust the position of the middle support placed on the middle support support plate in the vertical direction. In the structure, the lifting adjusting device is used to control the middle support to slowly fall on the middle support support plate after the middle support is separated from the upper support; and when a new middle support is installed, the lifting adjusting device is used to adjust the height position of the new middle support, so as to ensure that the pin hole and screw hole of the middle support are aligned with the pin hole and screw hole of the upper support. The baffle is a movable part, which is kept open when the replacement device is pushed into the middle support installation position to avoid interference with the middle support; when the middle support is pushed out of the installation position with the replacement device, the baffle connects the left and right ends of the slotted slot to increase the structural strength of the position and avoid deformation of the position.

[0084] In the application, the width of the strip-shaped slot of the middle support support plate is greater than the thickness of the middle support blade, so that the device can be smoothly inserted into the position of the middle support through the slot;

[0085] The width of the strip-shaped slot of the middle support support plate is less than the maximum cross-sectional width of the middle support (usually the middle section of the middle support is used as the model connection position, and the diameter of the equal straight cylinder is the maximum cross-sectional width of the middle support), so that the middle support can be smoothly supported on the middle support support plate after being separated from the upper support and the lower support instead of falling down;

[0086] The length of the strip-shaped slot of the middle support support plate is greater than the length of the middle support, so as to ensure that the middle support has as many contact surfaces as possible with the middle support support plate, which is beneficial to increasing the stability of the middle support when the middle support is placed on the device.

[0087] The length of the slotted slot of the middle support support plate should not be too long, and the length of the unslotted part should be kept in a proper proportion to ensure that the middle support support plate has sufficient strength to withstand the weight of the middle support without bending deformation or even breaking; the center of the middle support should be basically located at the center of the entire device, and at this time, the end of the middle support is just the end of the slotted slot, so as to reduce the possibility of the middle support overturning in the direction of the slotted slot. Further, the length of the strip-shaped slot of the middle support support plate is 1.05-2.0 times the length of the middle support.

[0088] The height of the replacement device should be ensured to be not greater than the height between the cross section and the lower wall plate when the cross section width of the middle support and the slot width of the support plate of the middle support are consistent, otherwise, the device cannot be pushed into the position of the middle support due to the interference between the support plate and the middle support. Further, the minimum height of the replacement device should be ensured to be not less than the height between the cross section and the lower wall plate minus 10mm when the cross section width of the middle support and the slot width of the support plate of the middle support are consistent, otherwise, after the middle support is separated from the upper support and the lower support respectively, the middle support may fall onto the support plate of the middle support, which may generate a large impact force on the device.

[0089] The maximum stroke of the lifting adjustment device should be ensured to be able to be connected with the screw installed in the threaded hole of the middle support, otherwise, the purpose of adjusting the height position of the middle support by the lifting device cannot be achieved.

[0090] The transverse position of the lifting adjustment device should be as close to the blade of the middle support as possible to reduce the transverse force arm and further reduce the transverse additional moment borne by the replacement device when adjusting the height position of the middle support. Because the replacement device has large strength in the lifting direction, but the transverse strength is relatively weak.

[0091] In the present application, the four driving wheels of the replacement device all adopt Mecanum wheels, which can realize forward movement, transverse movement, oblique movement, rotation and their combinations, and are very suitable for fine position adjustment in the limited movement space after the device enters the installation position of the middle support.

[0092] By adopting the above technical solutions, the present application has the following beneficial effects:

[0093] (1) The device has simple structure, the main structure adopts a profile, the weight of the device is greatly reduced under the premise of meeting the replacement demand of the model support mechanism, the position adjustment flexibility of the device is effectively improved, a large amount of manpower and time cost is saved, and the replacement efficiency of the model support mechanism is improved;

[0094] (2) The present application has reasonable design, reduces the replacement steps and workload of the model support mechanism, and improves the replacement efficiency of the model support mechanism; when the middle support is placed on the device, compared with the original device, the center of gravity of the present device is closer to the center of gravity of the middle support, which can better avoid the risk of overturning of the middle support or even the device due to the difference in the center of gravity position, and increase the safety of the replacement of the model support mechanism;

[0095] (3) The application has better universality; since the device of the application mainly realizes the replacement of the middle support by placing the middle support on the support plate, it no longer needs the screw hole position matched with the traditional device, so it is not only suitable for the replacement of the model support mechanism of the full bending knife structure, but also can meet the replacement of the model support mechanism of the half bending knife, and even for some special model support mechanisms, as long as the basic structure of the middle support is a middle section of the middle support with a blade and a width greater than the blade, and the middle section position is not lower than the height of the support plate, the device can be replaced or only needs to be slightly modified to realize the replacement. BRIEF DESCRIPTION OF DRAWINGS

[0096] The application will be explained by examples and with reference to the accompanying drawings, in which:

[0097] Figure 1 It is a model support device commonly used in the current high-speed wind tunnel.

[0098] Figure 2 It is a structural diagram of the middle support.

[0099] Figure 3 It is a front view of the existing model support mechanism replacement device.

[0100] Figure 4 It is a rear view of Figure 3 .

[0101] Figure 5 It is a top view of the existing model support mechanism replacement device.

[0102] Figure 6 It is a structural diagram of the replacement device of the large high-speed wind tunnel model support mechanism in Example 1.

[0103] Figure 7 It is a side view of Figure 6 .

[0104] Figure 8 It is a top view of Figure 6 .

[0105] Markings in the figure: 1, universal wheel, 2, base, 3, left bottom plate, 4, guide rail, 5, left connecting plate, 6, right connecting plate, 7, right bottom plate, 11, middle support support plate, 12, inclined rib, 13, bottom plate, 14, vertical plate, 15, Mecanum wheel, 16, first reinforcing rib, 17, second reinforcing rib, 18, lifting adjusting device, 19, baffle, 51, upper support, 52, middle support, 53, lower support, 54, motion control mechanism, 55, model, 56, support rod, 57, guide rail. DETAILED DESCRIPTION

[0106] All features disclosed in this specification, and / or all steps of any methods or processes disclosed in this specification, can be combined in any combination, except combinations where at least some of such features and / or steps are mutually exclusive.

[0107] Any of the features disclosed in this specification, unless explicitly stated otherwise, can be replaced by alternative features serving the same, or a similar, purpose.

[0108] Embodiment 1

[0109] The general quick replacement device structure of the large-scale high-speed wind tunnel model support mechanism of the present embodiment is shown in Figures 6-8 The replacement device includes a middle support support plate, a support assembly for providing support for the middle support support plate, a baffle, a lifting adjustment device, and a connecting assembly. The support assembly is four.

[0110] The support assembly includes a universal wheel, a bottom plate, a vertical plate, and an inclined rib. The universal wheel is arranged below the bottom plate, the vertical plate is arranged vertically on the bottom plate, and the two ends of the inclined rib are connected to the bottom plate and the vertical plate, respectively. As shown in Figure 7 The inclined rib, the bottom plate, and the vertical plate are arranged in a right-angled triangle. In this structure, the universal wheel is preferably a Mecanum wheel; the bottom plate can provide support for the vertical plate. The four Mecanum wheels cooperate with the support assembly to achieve forward movement, lateral movement, diagonal movement, rotation, and combinations thereof, which are very suitable for fine position adjustment of the replacement device in the limited movement space after entering the middle support installation position. In the present embodiment, the inclined rib, the bottom plate, and the vertical plate are welded together to form a whole, and the Mecanum wheel is installed below to form the support assembly.

[0111] The connecting assembly includes a first reinforcing rib and a second reinforcing rib. The first reinforcing rib is a group of parallelly arranged reinforcing ribs, and the two ends of the first reinforcing rib are connected to the support assembly along the axial direction of the slot on the middle support support plate. The second reinforcing rib is a group of parallelly arranged reinforcing ribs along the direction perpendicular to the axial direction of the slot on the middle support support plate, and the two ends of the second reinforcing rib are connected to the support assembly. In the present embodiment, the axial direction of the first reinforcing rib is perpendicular to the axial direction of the second reinforcing rib, and the projection of the first reinforcing rib and the second reinforcing rib along the vertical direction is rectangular. In this structure, the first reinforcing rib is used to connect the two connecting assemblies in the slotting direction to increase the strength of the device in the slotting direction. The second reinforcing rib is used to connect the two connecting assemblies in the range not slotted to enhance the lateral strength of the device.

[0112] The middle support support plate is in the shape of a n, and a strip-shaped groove is arranged on the middle support support plate and matched with the middle support, and the middle support can be placed on or removed from the middle support support plate through the strip-shaped groove. Preferably, the middle support support plate comprises a middle first support, a middle first connecting piece and a middle second support, the middle first support and the middle second support are parallel to each other, the middle first support and the middle first connecting piece are perpendicular to each other, the middle first support, the middle first connecting piece and the middle second support are sequentially connected and arranged in the shape of a n, and the strip-shaped groove is formed between the middle first support, the middle first connecting piece and the middle second support. Further, the width of the strip-shaped groove of the middle support support plate is greater than the thickness of the blade of the middle support, and the width of the strip-shaped groove of the middle support support plate is less than the maximum cross-sectional width of the middle support; the length of the strip-shaped groove of the middle support support plate is greater than the length of the middle support.

[0113] Further, the four vertices of the middle support support plate are arranged at the top ends of the vertical plates of the support assembly respectively; by adopting this structure, the four support assemblies can provide support for the middle support support plate and drive the middle support support plate to move.

[0114] The baffle is connected with the middle support support plate, and the baffle can rotate relative to the middle support support plate to open or close the strip-shaped groove on the middle support support plate. At the same time, the lifting adjusting device is arranged on the middle support support plate; the lifting adjusting device can adjust the position of the middle support placed on the middle support support plate in the vertical direction. In this structure, the lifting adjusting device is used to control the middle support to slowly fall on the middle support support plate after the middle support and the upper support are disengaged; and when a new middle support is installed, the lifting adjusting device is used to adjust the height position of the new middle support to ensure that the pin holes and screw holes of the middle support and the upper support are aligned. The baffle is a movable part, which is kept open when the replacement device is pushed into the middle support installation position to avoid interference with the middle support; when the middle support is pushed out of the installation position with the replacement device, the baffle connects the left and right ends of the slot to increase the structural strength of this position and avoid deformation of this position.

[0115] In this embodiment, the width of the strip-shaped slot of the middle support plate is greater than the thickness of the middle support blade, so as to ensure that the device can be smoothly inserted into the position of the middle support. The width of the strip-shaped slot of the middle support plate is less than the maximum cross-sectional width of the middle support (usually the middle section of the middle support is the model connection position, and the diameter of the equal straight cylindrical shape of this section is the maximum cross-sectional width of the middle support), so as to ensure that after the middle support is separated from the upper support and the lower support respectively, the middle support can be smoothly supported on the middle support plate instead of falling down. The length of the strip-shaped slot of the middle support plate is greater than the length of the middle support, so as to ensure that the middle support has as many contact surfaces with the middle support plate as possible, which is beneficial to increase the stability of the middle support when the middle support is placed on the device. At the same time, the length of the strip-shaped slot of the middle support plate should not be too long, and should maintain a proper proportion with the length of the unslotted part, so as to ensure that the middle support plate has sufficient strength to withstand the weight of the middle support without bending deformation or even breaking; the center of the middle support should be basically located at the center of the entire device, and at this time the end of the middle support is just the end of the slot, so as to reduce the possibility of the middle support overturning along the slot direction.

[0116] The height of the replacement device should be ensured to be not greater than the height between the cross section and the lower wall plate when the cross-sectional width of the middle support is consistent with the slot width of the middle support plate, otherwise, the device cannot be pushed into the position of the middle support due to the interference between the support plate and the middle support. Further, the minimum height of the replacement device should be ensured to be not less than the height between the cross section and the lower wall plate when the cross-sectional width of the middle support is consistent with the slot width of the middle support plate minus 10 mm, otherwise, after the middle support is separated from the upper support and the lower support respectively, the middle support may fall onto the middle support plate, which may generate a large impact force on the device.

[0117] The maximum stroke of the lifting adjustment device should be ensured to be able to connect with the screw installed in the threaded hole of the middle support, otherwise, the purpose of adjusting the height position of the middle support by the lifting device cannot be achieved. The transverse position of the lifting adjustment device should be as close to the middle support blade as possible, so as to reduce the transverse force arm and further reduce the transverse additional moment borne by the replacement device when adjusting the height position of the middle support. Because such replacement device has greater strength in the lifting direction, but weaker strength in the transverse direction.

[0118] The steps of using the device to replace the model support mechanism are as follows.

[0119] 1. Take out the positioning pins connecting the middle support with the upper support and the lower support respectively.

[0120] 2. Adjust the position of the replacement device so that the strip-shaped slot of the middle support plate is as close to the middle support as possible.

[0121] 3. Open the baffle and push the replacement device into the position of the middle support.

[0122] 4. Adjust the spatial position of the replacement device by controlling the universal wheel, so that the middle support falls into the middle position of the replacement device as much as possible.

[0123] 5. Remove the connecting screw between the middle support and the lower support. To prevent the lower support from freely falling due to the loss of control after the middle support is detached, use a removed screw to pass through the screw hole with threads located in the lower support and an axis position in the middle support. Ensure that the screw rod does not extend into the middle support, otherwise the middle support cannot be removed. The part not inserted is supported by a jack to achieve the position between the lower support and the lower wall panel without falling due to the detachment of the middle support.

[0124] 6. Use a removed screw to pass through the middle screw hole with threads located in the middle support and an axis position in the middle support. Ensure that the screw rod does not extend into the lower support, and the part not inserted is connected to the lifting adjustment device.

[0125] 7. Remove the connecting screw between the middle support and the upper support.

[0126] 8. Slowly lower the middle support onto the middle support support plate of the replacement device by controlling the extension amount of the lifting adjustment device.

[0127] 9. Use the baffle to connect the strip-shaped slot position of the middle support support plate to the left and right ends, which can ensure that the middle support support plate deforms by splitting left and right due to stress, and can also to some extent avoid the overturning of the middle support in the pitch direction.

[0128] 10. Adjust the spatial position of the replacement device by controlling the universal wheel, so that the middle support is appropriately moved horizontally away from the wind tunnel axis position of the upper support and the lower support, to avoid interference with the upper support and the lower support when the replacement device is withdrawn.

[0129] 11. Withdraw the replacement device and the middle support from the position of the model support mechanism to the corresponding storage space.

[0130] 12. Use a travelling crane to move the middle support away from the replacement device, and place the middle support to be installed onto the replacement device.

[0131] 13. Adjust the spatial position of the replacement device by controlling the universal wheel, so that the middle support is aligned with the planned installation position as much as possible, to reduce the workload of position adjustment in limited space after the middle support reaches the expected installation position.

[0132] 14. Adjust the spatial position of the replacement device by controlling the universal wheel, and adjust the height position of the middle support by using the lifting adjustment device, so that the pin hole and screw hole of the middle support and the upper support are aligned.

[0133] 15. Connect the upper bracket and the middle bracket by using the pin and the screw.

[0134] 16. Align the pin hole and the screw hole of the middle bracket and the lower bracket by adjusting the extension of the jack.

[0135] 17. Connect the middle bracket and the lower bracket by using the pin and the screw.

[0136] 18. Move the device as a whole out of the area where the middle bracket is located. At this point, the whole model support mechanism replacement work is completed.

[0137] The present application is not limited to the foregoing specific embodiments. The present application extends to any novel one, or any novel combination, of the features disclosed in this specification, and to any novel method or process disclosed, or any novel combination of steps of the disclosed methods or processes.

Claims

1. A replacement device for a support mechanism of a large high-speed wind tunnel model, characterized in that, Includes a central support plate, a support assembly for providing support to the central support plate, a baffle, a lifting and adjusting device, and a connecting assembly; The support assembly includes casters, a base plate, a vertical plate, and diagonal ribs. The casters are located below the base plate and can drive the base plate to move. The vertical plate is located on the base plate and the base plate can provide support for the vertical plate. The two ends of the diagonal ribs are connected to the base plate and the vertical plate respectively, and the diagonal ribs, the base plate, and the vertical plate are arranged in a triangle. The central support plate is U-shaped, and the central support plate is provided with a strip groove that matches the central support, and the central support can be placed on the central support plate or removed from the central support plate through the strip groove. The baffle is connected to the central support plate and can rotate relative to the central support plate to open or close the strip groove on the central support plate; the lifting adjustment device is installed on the central support plate and can adjust the position of the central support placed on the central support plate in the vertical direction. The support assembly comprises four members; the connecting assembly includes a first reinforcing rib and a second reinforcing rib; the first reinforcing rib is a group, extending along the axial direction of the strip groove on the central support plate, with both ends of the first reinforcing rib connected to the support assembly; the second reinforcing rib is a group, extending along the axial direction perpendicular to the strip groove on the central support plate, with both ends of the second reinforcing rib connected to the support assembly; the projections of the first and second reinforcing ribs in the vertical direction form a quadrilateral. The support components are located below the four vertices of the central support plate, and the four support components can provide support for the central support plate and drive the central support plate to move. The width of the groove in the middle support plate is greater than the thickness of the middle support blade, and the width of the groove in the middle support plate is less than the maximum cross-sectional width of the middle support. The length of the groove in the support plate of the central bracket is greater than the length of the central bracket.

2. The replacement device according to claim 1, characterized in that, The upright plate is vertically mounted on the base plate, and the diagonal ribs, the base plate, and the upright plate are arranged in a right-angled triangle.

3. The replacement device according to claim 1, characterized in that, The first reinforcing ribs are arranged in a group, and the first reinforcing ribs are arranged parallel to each other; the second reinforcing ribs are arranged in a group, and the second reinforcing ribs are arranged parallel to each other.

4. The replacement device according to claim 3, characterized in that, The axial direction of the first reinforcing rib is perpendicular to the axial direction of the second reinforcing rib, and the projections of the first and second reinforcing ribs along the vertical direction form a rectangle.

5. The replacement device according to claim 1, characterized in that, The four vertices of the central support plate are respectively located at the top of the vertical plate of the support assembly, and the support assembly can provide support for the central support plate.

6. The replacement device according to any one of claims 1 to 5, characterized in that, The central support plate includes a central first support member, a central first connector, and a central second support member. The central first support member and the central second support member are parallel to each other, and the central first support member and the central first connector are perpendicular to each other. The central first support member, the central first connector, and the central second support member are connected in sequence and arranged in a U-shape. A strip groove is formed between the central first support member, the central first connector, and the central second support member.

7. A replacement method using the replacement device according to any one of claims 1 to 6, characterized in that, Includes the following steps: (1) Remove the positioning pins that connect the middle bracket to the upper bracket and the lower bracket respectively; (2) Adjust the position of the replacement device so that the groove of the middle support plate is aligned with the middle support as much as possible; (3) Open the baffle and push the replacement device into the position of the middle support; (4) Adjust the spatial position of the replacement device by controlling the casters so that the middle support is positioned as close as possible to the middle of the replacement device after it is lowered. (5) Remove the connecting screws between the middle bracket and the lower bracket; to prevent the lower bracket from slipping freely due to loss of control after the middle bracket is detached, use a removed screw to insert it into the screw hole in the middle of the lower bracket where the thread is located and the axis is located. Ensure that the screw does not extend into the middle bracket, otherwise the middle bracket cannot be removed. Use a jack to support the part that is not inserted to ensure that the position between the lower bracket and the lower wall panel does not fall due to the detachment of the middle bracket. (6) Using a removed screw, insert it through the screw hole in the middle of the bracket with the thread located in the middle and the axis located in the middle. Ensure that the screw does not extend into the lower bracket. The part that is not inserted is connected to the lifting adjustment device. (7) Remove the screws connecting the middle bracket and the upper bracket; (8) By controlling the extension and retraction of the lifting adjustment device, the middle support is slowly lowered onto the middle support plate of the replacement device; (9) Use baffles to connect the left and right ends of the strip groove of the middle support plate. This can ensure that the middle support plate will not deform into a bifurcated shape due to the force, and can also prevent the middle support from overturning in the pitch direction to a certain extent. (10) By controlling the universal wheels to adjust the spatial position of the replacement device, the middle support is moved laterally to move away from the wind tunnel axis position where the upper and lower supports are located, so as to avoid interference with the upper and lower supports when the replacement device is withdrawn; (11) Remove the replacement device and the central support from the location of the model support mechanism to a spacious area; (12) Use the crane to remove the middle support from the replacement device and place the middle support to be installed onto the replacement device; (13) By controlling the universal wheels to adjust the spatial position of the replacement device, the middle support is aligned with the planned installation position as much as possible, so as to reduce the workload of adjusting the position of the middle support in the limited space after it reaches the expected installation position. (14) Adjust the spatial position of the replacement device by controlling the universal wheel, and adjust the height position of the middle bracket by using the lifting adjustment device, so that the pin hole and screw hole positions of the middle bracket and the upper bracket are aligned. (15) Connect the upper bracket and the middle bracket using pins and screws; (16) By adjusting the extension and retraction of the jack, the pin holes and screw holes of the middle support and the lower support are aligned. (17) Connect the middle support and the lower support using pins and screws; (18) Move the entire device out of the area where the central support is located; With this, the replacement of the entire model support structure is complete.

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