CN115343015B - Connecting structure of small-rod-diameter balance and multi-pyramid profile of support rod and dismounting method - Google Patents
Connecting structure of small-rod-diameter balance and multi-pyramid profile of support rod and dismounting method Download PDFInfo
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- CN115343015B CN115343015B CN202211276119.2A CN202211276119A CN115343015B CN 115343015 B CN115343015 B CN 115343015B CN 202211276119 A CN202211276119 A CN 202211276119A CN 115343015 B CN115343015 B CN 115343015B
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000012360 testing method Methods 0.000 abstract description 17
- 238000005096 rolling process Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/02—Wind tunnels
- G01M9/04—Details
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B7/00—Connections of rods or tubes, e.g. of non-circular section, mutually, including resilient connections
- F16B7/18—Connections of rods or tubes, e.g. of non-circular section, mutually, including resilient connections using screw-thread elements
- F16B7/182—Connections of rods or tubes, e.g. of non-circular section, mutually, including resilient connections using screw-thread elements for coaxial connections of two rods or tubes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/06—Measuring arrangements specially adapted for aerodynamic testing
- G01M9/062—Wind tunnel balances; Holding devices combined with measuring arrangements
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Abstract
A small rod diameter balance and support rod multi-pyramid profile connecting structure and a disassembling and assembling method belong to the technical field of aerospace wind tunnel tests. The invention solves the problems that the balance and the support rod used for the wind tunnel test at present are inconvenient to disassemble and assemble when connected through a cone, and the balance is easy to damage when connected. The tail end of the balance is connected with a support rod, the support rod is connected with a wind tunnel supporting device, the tail end of the balance is provided with a hexagonal pyramid, the taper of a bus of the hexagonal pyramid relative to an axis is 1. The connecting structure of the small-rod-diameter balance and the multi-pyramid profile of the support rod is convenient to disassemble and assemble and is suitable for repeated assembly and disassembly.
Description
Technical Field
The invention belongs to the technical field of aerospace wind tunnel tests, and particularly relates to a connecting structure of a small-rod-diameter balance and a supporting rod multi-pyramid profile and a disassembling and assembling method.
Background
The wind tunnel test is an important means for the aeronautical and astronautic aircraft to carry out aerodynamic research, the wind tunnel balance is a precise measuring device used for measuring the aerodynamic force/moment of an aircraft test model in the wind tunnel test and is key equipment of a force measurement test, and the support rod is an important supporting device of the aircraft test model and the balance. In order to ensure the accurate measurement of the pneumatic load of the wind tunnel test model, the reliable connection between the wind tunnel balance and the support rod must be ensured.
The connection mode of the wind tunnel balance and the support rod mainly comprises cylindrical connection, flange connection and conical connection. When the cylinders are connected, the cylinders are connected by reasonably designing the matching tolerance of the cylinders and fastening the cylinders through pins or screws, the occupation of the connecting space of the cylinders is small, but the matching sections of the cylinders cannot be used after being worn, and the conventional main force wind tunnel rarely uses a cylinder connecting mode; when the flanges are connected, the balance and the support rod are connected together through the flange plate, when the flange plate is large enough, the connection is reliable, but the occupied space is large, and the flange plate is not suitable for wind tunnels with the magnitude of 1 meter and below; the balance and the supporting rod are connected together through interference fit when the cones are connected, and the wind tunnel balance is a commonly adopted connection mode of the wind tunnel balance-supporting rod below 1 meter level at present;
for the wind tunnel tail boom force measurement test of 1 meter magnitude and below, the model inner space is limited, the radial clearance of model bottom and branch generally is 5mm, therefore balance and branch diameter are less, the circular cone connection passes through interference fit and transmits roll moment, this connected mode is very suitable for connecting under the condition of little pole footpath, not only the model space occupies for a short time, but also can guarantee the axiality of balance and branch, the requirement on processing quality is lower, can satisfy the not big and stable experimental requirement of operating mode of roll moment, however, according to the wind tunnel application practice of many years, the circular cone connected mode still has following several problems at present:
1. the existing conical connection mounting and dismounting adopts wedge key tensioning and loosening, and the process of tightening the wedge key is easy to cause damage to a balance;
2. for wind tunnel tests with large display ratio layout, flying wing layout and novel layout models, the wind tunnel tests have the advantages that the rolling torque is large, the models are easy to vibrate, the reliability is poor when cone connection is adopted, the balance and the support rod are easy to rotate, and the test accuracy and the test efficiency are influenced;
3. in order to improve the transmission reliability of the rolling torque, an anti-rotation positioning key is arranged between an inner cone and an outer cone sometimes, but because the rod diameter is small, a 1' corner error can be formed only by a key fit clearance of 0.02mm for a rod diameter of 30mm, if the tight fit key connection is used, the balance and the support rod are extremely difficult to install, and the increase of the corner error can be aggravated by key abrasion after repeated use;
4. the rated rolling torque transmitted by the conical connection mode is small, and the zero return performance of the balance is poor when forward and reverse rolling torque loading is carried out.
In order to solve the problems, the wind tunnel balance-strut connecting structure is suitable for the small-rod-diameter requirement of the wind tunnel tail boom force measurement test with the magnitude of 1 meter and below, convenient and reliable in connection, and improves the accuracy and efficiency of current wind tunnel test data.
Disclosure of Invention
The present invention has been developed in order to solve the problems that a balance and a strut currently used in a wind tunnel test are inconvenient to disassemble and assemble when they are connected by a cone and easily cause damage to the balance when they are connected, and a brief summary of the present invention is given below in order to provide a basic understanding of some aspects of the present invention. It should be understood that this summary is not an exhaustive overview of the invention. It is not intended to determine the key or critical elements of the present invention, nor is it intended to limit the scope of the present invention.
The technical scheme of the invention is as follows:
the first scheme is as follows: a small-rod-diameter balance and supporting rod multi-pyramid molded surface connecting structure comprises a balance, a supporting rod and a model, wherein the front end of the balance is connected with the model, the tail end of the balance is connected with the supporting rod, the supporting rod is connected with wind tunnel supporting equipment, the tail end of the balance is provided with a hexagonal pyramid, a bus of the hexagonal pyramid is opposite to an axis, the taper of the bus of the hexagonal pyramid is 1.
Furthermore, the tail end of the hexagonal pyramid is provided with a circumferential chamfer, a second inclined threaded hole is formed in an inner hole of the hexagonal pyramid, the second inclined threaded hole is formed in the right side of the first inclined threaded hole, and a dismounting screw is screwed into the second inclined threaded hole and pushes the circumferential chamfer to disassemble the balance and the support rod which are connected.
Furthermore, the inclination angle of the inclined counter bore and the first inclined threaded hole is 30 degrees, the inclination angle of the second inclined threaded hole is opposite to the first inclined threaded hole by 30 degrees, the angle of the annular chamfer is 30 degrees, and the aperture of the inclined counter bore is larger than that of the first inclined threaded hole.
Furthermore, the number of the inclined counter bores is 4, the number of the first inclined threaded holes is 4, and the number of the second inclined threaded holes is 2.
Further, the length of the hexagonal pyramid is 1.5-2.5 times of the diameter of a polygon circumscribed circle at the large end of the pyramid.
Further, the balance is connected with the model through a tensioning screw.
Scheme II: according to the first scheme, the method for disassembling and assembling the small-rod-diameter balance and support rod multi-pyramid profile connecting structure comprises a method for connecting the balance and the support rod and a method for disassembling the balance and the support rod:
the connection method of the balance and the support rod comprises the following steps: inserting the hexagonal pyramid at the tail end of the balance into the hexagonal pyramid inner hole at the end part of the support rod until the first inclined threaded hole is aligned with the inclined counter bore, screwing a set screw into the first inclined threaded hole and pushing the inclined counter bore, and further connecting and tensioning the hexagonal pyramid through the molded surface to realize the connection of the balance and the support rod;
the disassembling method of the balance and the support rod comprises the following steps: and screwing the disassembling screw into the second inclined threaded hole and pushing the annular chamfer on the hexagonal pyramid, so that the hexagonal pyramid is pushed out of the hexagonal pyramid inner hole, and the balance and the support rod are disassembled.
The invention has the following beneficial effects:
1. according to the connecting structure of the small-rod-diameter balance and the multi-pyramid profile of the supporting rod, the polygon profile is in close contact during connection by utilizing the polygon profile limiting function and the interference function of cone fit, the self-locking property of connection is guaranteed by adopting 1;
2. the polygonal profile limiting and cone interference fit of the small-rod-diameter balance and support rod polygonal pyramid profile connecting structure provided by the invention can double guarantee the reliable connection of the balance and the support rod, and the connection performance can be guaranteed even if the surfaces of the pyramids are abraded;
3. compared with conical connection, the connecting structure of the small-rod-diameter balance and the multi-pyramid profile of the support rod can ensure any rolling torque in the strength envelope, and due to the adoption of gapless interference fit, the forward and reverse directions have no back gap, and the torque transmission is accurate;
4. the multi-pyramid profile connection of the small-rod-diameter balance and the multi-pyramid profile connection structure of the support rod still maintains the coaxial positioning of conical connection, and the accuracy of the initial installation angle of the balance in the wind tunnel is guaranteed.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a small-rod-diameter balance and a multi-pyramid profile connecting structure of a strut;
FIG. 2 is a schematic structural view of a balance;
FIG. 3 is a schematic structural view of a strut;
FIG. 4 is a schematic view of the portion of FIG. 2 taken from the direction A;
FIG. 5 is a cross-sectional view B-B of FIG. 4;
FIG. 6 is a cross-sectional view taken along line C-C of FIG. 3;
fig. 7 is a sectional view taken along line D-D of fig. 6.
In the figure, 1-a balance, 2-a supporting rod, 3-a hexagonal pyramid, 4-an inclined counter bore, 5-a circumferential chamfer, 6-a hexagonal pyramid inner hole, 7-a first inclined threaded hole, 8-a second inclined threaded hole, 9-a set screw, 10-a disassembly screw, 11-a tensioning screw and 12-a model.
Detailed Description
In order that the objects, aspects and advantages of the invention will become more apparent, the invention will be described by way of example only, and in connection with the accompanying drawings. It is to be understood that such description is merely illustrative and not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
The connection mentioned in the present invention is divided into a fixed connection and a detachable connection, the fixed connection (i.e. the non-detachable connection) includes but is not limited to a folding connection, a rivet connection, an adhesive connection, a welding connection, and other conventional fixed connection methods, the detachable connection includes but is not limited to a screw connection, a snap connection, a pin connection, a hinge connection, and other conventional detachment methods, when the specific connection method is not clearly defined, the function can be realized by always finding at least one connection method from the existing connection methods by default, and a person skilled in the art can select the connection method according to needs. For example: the fixed connection selects welding connection, and the detachable connection selects hinge connection.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Embodiment 1, the embodiment is described with reference to fig. 1 to 7, and a small rod diameter balance and strut multi-pyramid profile connecting structure of the embodiment includes a balance 1, a strut 2, and a model 12, a front end of the balance 1 is connected to the model 12, a tail end of the balance 1 is connected to the strut 2, the strut 2 is connected to a wind tunnel supporting device, the diameter of the balance 1 is 40mm, a taper of a bus of the hexagonal pyramid 3 relative to an axis is 1% 10, the tail end of the balance 1 is in a hexagonal pyramid structure, a diameter of a large end hexagon circumscribed circle of the hexagonal pyramid 3 is 36.7mm, a length of the hexagonal pyramid 3 is 2 times of a diameter of a large end circumscribed circle of the pyramid, a length of the hexagonal pyramid 3 is 73.4mm, 4 inclined counter bores 4 with an inclination angle of 30 ° are processed in a middle portion of the hexagonal pyramid 3, a diameter of the inclined counter bores 4 is 6.6mm, a front end of the strut 2 is processed with a hexagonal inner bore 6, a large end circumscribed circle of the hexagonal inner bore 6 of the hexagonal pyramid is processed with a diameter of the hexagonal inner bore 6 is 36.7mm, and 4 first inclined threaded holes with an inclination angle of 30 ° are processed in corresponding positions on the hexagonal inner bore 6;
inserting a hexagonal pyramid 3 of a balance 1 into a hexagonal pyramid inner hole 6 of a support rod 2, respectively screwing the hexagonal pyramid 3 into each first inclined threaded hole 7 on the support rod 2 through 4 set screws 9, pushing 4 inclined counter bores 4 on the surface of the hexagonal pyramid 3, further tensioning the balance 1 and the support rod 2, then connecting the balance 1 with a model 12 through M10 tensioning screws 11, and installing the support rod 2 on a 1.2M wind tunnel bracket;
specifically, the tail end of hexagonal pyramid 3 is provided with hoop chamfer 5, and the angle of hoop chamfer 5 is 30, and processing has 2 second slope screw holes 8 on hexagonal pyramid hole 6, and second slope screw hole 8 arranges on the right side of first slope screw hole 7, and its inclination is reverse 30 for first slope screw hole 7, when dismantling between this peaceful 1 and branch 2, screw in second slope screw hole 8 respectively through 2M 6 disassembly screw 10 in, push up 30 of the ring direction chamfer 5 on the hexagonal pyramid 3, and then unpack apart 1 and branch 2 balance face.
inserting a hexagonal pyramid 3 of a balance 1 into a hexagonal pyramid inner hole 6 of a support rod 2, respectively screwing the hexagonal pyramid 3 into each first inclined threaded hole 7 on the support rod 2 through 4 set screws 9, pushing 4 inclined counter bores 4 on the surface of the hexagonal pyramid 3, further tensioning the balance 1 and the support rod 2, then connecting the balance 1 with a model 12 through M10 tensioning screws 11, and installing the support rod 2 on a 1.2M wind tunnel bracket;
specifically, the tail end of hexagonal pyramid 3 is provided with hoop chamfer 5, and the angle of hoop chamfer 5 is 30, and processing has 2 second slope screw holes 8 on hexagonal pyramid hole 6, and second slope screw hole 8 arranges on the right side of first slope screw hole 7, and its inclination is reverse 30 for first slope screw hole 7, when dismantling between this peaceful 1 and branch 2, screw in second slope screw hole 8 respectively through 2M 6 disassembly screw 10 in, push up 30 of the ring direction chamfer 5 on the hexagonal pyramid 3, and then unpack apart 1 and branch 2 balance face.
inserting a hexagonal pyramid 3 of a balance 1 into a hexagonal pyramid inner hole 6 of a support rod 2, respectively screwing the hexagonal pyramid 3 into each first inclined threaded hole 7 on the support rod 2 through 4 set screws 9, pushing 4 inclined counter bores 4 on the surface of the hexagonal pyramid 3, further tensioning the balance 1 and the support rod 2, then connecting the balance 1 with a model 12 through M10 tensioning screws 11, and installing the support rod 2 on a 1.2M wind tunnel bracket;
specifically, the tail end of the hexagonal pyramid 3 is provided with a circumferential chamfer 5, the angle of the circumferential chamfer 5 is 30 degrees, 2 second inclined threaded holes 8 are machined in a hexagonal pyramid inner hole 6, the second inclined threaded holes 8 are arranged on the right side of the first inclined threaded hole 7, the inclination angle of the second inclined threaded holes is reverse 30 degrees relative to the first inclined threaded hole 7, when the balance 1 and the support rod 2 are disassembled, 2M 6 disassembling screws 10 are respectively screwed into the second inclined threaded holes 8, 30-degree chamfer surfaces of the circumferential chamfer 5 on the hexagonal pyramid 3 are pushed, and then the balance 1 and the support rod 2 are disassembled.
the connection method of the balance 1 and the support rod 2 comprises the following steps: inserting the hexagonal pyramid 3 at the tail end of the balance 1 into a hexagonal pyramid inner hole 6 at the end part of the support rod 2 until the first inclined threaded hole 7 is aligned with the inclined counter bore 4, screwing a set screw 9 into the first inclined threaded hole 7 and pushing the inclined counter bore 4, and further connecting and tensioning the hexagonal pyramid 3 through a molded surface to realize the connection of the balance 1 and the support rod 2;
the method for disassembling the balance 1 and the support rod 2 comprises the following steps: and screwing the disassembling screw 10 into the second inclined threaded hole 8 and pushing the annular chamfer 5 on the hexagonal pyramid 3, and further pushing the hexagonal pyramid 3 out of the hexagonal pyramid inner hole 6 to realize the disassembly of the balance 1 and the support rod 2.
The present embodiment is only illustrative of the patent and does not limit the scope of protection thereof, and those skilled in the art can make modifications to the part thereof without departing from the spirit of the patent.
Claims (6)
1. The utility model provides a little rod footpath balance and branch polygon pyramid profile connection structure, includes balance (1), branch (2) and model (12), and the front end and the model (12) of balance (1) are connected, and the tail end and branch (2) of balance (1) are established and are connected, and branch (2) are connected its characterized in that with wind-tunnel support equipment: the tail end of the balance (1) is provided with a hexagonal pyramid (3), the relative conicity of a bus of the hexagonal pyramid (3) and an axis is 1;
the tail end of the hexagonal pyramid (3) is provided with a circumferential chamfer (5), a second inclined threaded hole (8) is formed in a hexagonal pyramid inner hole (6), the second inclined threaded hole (8) is arranged on the right side of the first inclined threaded hole (7), a dismounting screw (10) is screwed into the second inclined threaded hole (8) and pushes the circumferential chamfer (5) to disassemble the balance (1) and the supporting rod (2) which are connected.
2. The small-rod-diameter balance and support rod multi-pyramid profile connecting structure according to claim 1, wherein: the inclination angle of the inclined counter bore (4) and the first inclined threaded hole (7) is 30 degrees, the inclination angle of the second inclined threaded hole (8) is reverse 30 degrees relative to the first inclined threaded hole (7), the angle of the annular chamfer (5) is 30 degrees, and the aperture of the inclined counter bore (4) is larger than that of the first inclined threaded hole (7).
3. The small-rod-diameter balance and support rod multi-pyramid profile connecting structure according to claim 2, wherein: the number of the inclined counter bores (4) is 4, the number of the first inclined threaded holes (7) is 4, and the number of the second inclined threaded holes (8) is 2.
4. The small-rod-diameter balance and rod multi-pyramid profile connection structure as claimed in claim 1 or 3, wherein: the length of the hexagonal pyramid (3) is 1.5-2.5 times of the diameter of a polygon circumscribed circle at the large end of the pyramid.
5. The small-rod-diameter balance and support rod multi-pyramid profile connection structure according to claim 4, wherein: the balance (1) is connected with the model (12) through a tensioning screw (11).
6. The method for dismounting the connecting structure of the small-rod-diameter balance and the multi-edge profile of the support rod according to claim 3 is characterized by comprising a method for connecting the balance (1) and the support rod (2) and a method for dismounting the balance (1) and the support rod (2):
the connection method of the balance (1) and the support rod (2) comprises the following steps: inserting a hexagonal pyramid (3) at the tail end of the balance (1) into a hexagonal pyramid inner hole (6) at the end part of the support rod (2) until a first inclined threaded hole (7) is aligned with the inclined counter bore (4), screwing a set screw (9) into the first inclined threaded hole (7) and pushing the inclined counter bore (4), and further connecting and tensioning the hexagonal pyramid (3) through a molded surface to realize the connection of the balance (1) and the support rod (2);
the method for disassembling the balance (1) and the support rod (2) comprises the following steps: and screwing a disassembling screw (10) into the second inclined threaded hole (8) and pushing the annular chamfer (5) on the hexagonal pyramid (3), so that the hexagonal pyramid (3) is pushed out from the hexagonal pyramid inner hole (6), and the balance (1) and the support rod (2) are disassembled.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211276119.2A CN115343015B (en) | 2022-10-19 | 2022-10-19 | Connecting structure of small-rod-diameter balance and multi-pyramid profile of support rod and dismounting method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211276119.2A CN115343015B (en) | 2022-10-19 | 2022-10-19 | Connecting structure of small-rod-diameter balance and multi-pyramid profile of support rod and dismounting method |
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| CN115343015A CN115343015A (en) | 2022-11-15 |
| CN115343015B true CN115343015B (en) | 2022-12-27 |
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