A buckle-down fixture for fixing six-dimensional force sensor

Abstract

The present invention relates to the field of sensor installation technology, and discloses a buckle-down clamp for fixing a six-dimensional force sensor, comprising a connecting plate, a base and a clamping jaw; the connecting plate is used to fix and connect the six-dimensional force sensor; the base is connected to the connecting plate, and a clamping jaw is provided on the base; the clamping jaw comprises a left clamping jaw and a right clamping jaw, and both are hinged with the base, and are used to form a clamping cavity for clamping a component to be tested; an ear plate is provided on the side of the left clamping jaw and the right clamping jaw away from the clamping cavity, and a supporting bolt is provided on the base. Compared with the traditional installation method, the buckle-down clamp of the present invention is easier to install, and can improve the efficiency of replacing the model to be tested during the test. At the same time, the light and simple structure effectively reduces the problem of reduction in the effective range of the sensor caused by the connection mechanism itself. Through the unique support bolt setting, a suitable axial preload can be applied during clamping, thereby improving the efficiency and accuracy of the aerodynamic test of the six-dimensional force sensor of the bridge segment model.

Description

Technical Field

[0001] The present invention relates to the technical field of sensor installation, and in particular to a buckle-down clamp for fixing a six-dimensional force sensor. Background Art

[0002] The six-dimensional force sensor is a test equipment for accurately testing the aerodynamic forces of train and bridge models in wind tunnel tests of vehicle-bridge systems. At present, the commonly used bridge models in domestic wind tunnel tests include segment models, tie rod models, and aeroelastic models, among which segment models are the most widely used. Although the segment model has a large scale, detailed components such as main beam railings, maintenance vehicle tracks, and wind barriers can be well simulated, and the test results have a high degree of credibility.

[0003] The existing vehicle-bridge system wind tunnel test six-dimensional force sensor and bridge segment model connection installation method mostly adopts a combination of flange connection plate and expansion connector; when in use, the upper flange of the flange connection plate is placed on the through rod at one end of the bridge segment model, the expansion connector is placed between the upper flange of the flange connection plate and the lower flange of the flange connection plate, the bottom surface of the lower flange of the flange connection plate is bolted and fastened to the six-dimensional force sensor, and the front and rear positions of the expansion connector are adjusted to limit the position of the flange connection plate on the through rod at one end of the bridge segment model. Although the above-mentioned flange connection plate installation method can adjust the exposed length of the segment model through rod to a certain extent during the installation process, this installation method also has many problems: (1) The flange connection plate has a large mass, and when it is used for the connection and installation of the six-dimensional force sensor, it will apply a large stress to the equipment in advance, resulting in a reduction in the effective range of the six-dimensional force sensor during the test; (2) At the same time, the flange connection plate adopts the limit method of the expansion connector, resulting in an axial tension in the through rod direction when the upper and lower flanges of the flange connection plate are engaged and connected, which inevitably applies a pre-tension in the axial direction of the six-dimensional force sensor, which to a certain extent reduces the effective range of the six-dimensional force sensor.

[0004] In summary, there are still many unreasonable aspects in the installation method of six-dimensional force sensors in the wind tunnel process of the vehicle-bridge system at this stage. In order to accurately obtain the aerodynamic characteristics of the railway bridge-train system, it is urgent to find a convenient and accurate equipment connection device to solve the problems in the existing technology. Summary of the invention

[0005] The object of the present invention is to provide a buckle-down clamp for fixing a six-axis force sensor, and the specific technical solution is as follows:

[0006] A buckle-down clamp for fixing a six-dimensional force sensor, comprising a connecting plate, a support platform and a clamping claw;

[0007] The connecting plate is used for fixedly connecting the six-dimensional force sensor;

[0008] The support platform is connected to the connecting plate, and a clamping claw is provided on the support platform;

[0009] The clamping jaw comprises a left clamping jaw and a right clamping jaw, and the left clamping jaw and the right clamping jaw are both hinged to the platform and used to form a clamping cavity for clamping the component to be tested;

[0010] The left clamping jaw and the right clamping jaw are both provided with ear plates on one side away from the clamping cavity, and the support platform is also provided with support bolts matching the ear plates, so that the support bolts can press against the ear plates from the support platform toward the ear plates.

[0011] Preferably, the left clamping jaw, the right clamping jaw and the support platform are all provided with a shaft through hole, and a shaft bolt is movably arranged in the shaft through hole for the left clamping jaw and the right clamping jaw to rotate and open and close relative to the shaft bolt.

[0012] Preferably, a support bolt through hole is further provided on the support platform; the support bolt is threadedly connected to the support bolt through hole and passes through the support bolt through hole to abut against the ear plate.

[0013] Preferably, the connecting disk is a disk structure, one side of the connecting disk is tightly fitted with the force measuring surface of the six-dimensional force sensor, and is fixedly connected by bolts;

[0014] The bolt holes on the connection plate are countersunk on the side facing away from the sensor.

[0015] Preferably, the support platform is a square plate structure, and a square groove is provided on the support platform;

[0016] The four corners of the base are rounded.

[0017] Preferably, the connection between the ear plate and the left clamping jaw and the right clamping jaw adopts an arc-shaped transition, and a corresponding groove is provided on the ear plate at the abutment with the support bolt.

[0018] Preferably, a fastening nut is also provided at the end of the screw rod of the rotating shaft bolt.

[0019] Preferably, the support bolt is a hexagon socket bolt.

[0020] The application of the technical solution of the present invention has the following beneficial effects:

[0021] A buckle-down clamp for fixing a six-dimensional force sensor comprises a connection plate, a support and a clamping claw; the connection plate is used to fix and connect the six-dimensional force sensor; the support is connected to the connection plate, and a clamping claw is arranged on the support; the clamping claw comprises a left clamping claw and a right clamping claw, and the left clamping claw and the right clamping claw are both hinged with the support and used to form a clamping cavity for clamping a component to be tested; an ear plate is arranged on the side of the left clamping claw away from the clamping cavity and the side of the right clamping claw away from the clamping cavity, and a support bolt matching the ear plate is also arranged on the support, and the support bolt is used to press against the ear plate from the support toward the ear plate. Compared with the traditional installation method, the buckle-down clamp for fixing a six-dimensional force sensor of the present invention is easier to install, and can improve the efficiency of replacing the model to be tested during the test. At the same time, the light and simple structure effectively reduces the problem of sensor effective range reduction caused by the connection mechanism itself. Through the unique support bolt setting, a suitable axial preload can be applied during clamping, thereby improving the efficiency and accuracy of the aerodynamic test of the six-dimensional force sensor of the bridge segment model.

[0022] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0024] Figure 1 It is a schematic diagram of the overall structure of the buckle-down clamp of the present invention;

[0025] Figure 2 for Figure 1 A schematic diagram of the structure of the middle connecting plate;

[0026] Figure 3 for Figure 1 Schematic diagram of the structure of the middle bearing platform;

[0027] Figure 4 for Figure 1 Schematic diagram of the structure of the middle clamping jaw;

[0028] Figure 5 for Figure 4 A schematic structural diagram of the left clamping jaw in the clamping jaws from another perspective;

[0029] Figure 6 for Figure 1 Assembly diagram of the central shaft bolt and fastening nut.

[0030] In the figure: 1. Connecting plate; 1.1. Sensor connecting bolt through hole; 1.2. Shaft bolt through hole; 2. Base; 2.1. Support bolt through hole; 2.2. Shaft through hole; 3. Clamp; 3.1. Left clamp; 3.2. Right clamp; 3.3. Shaft connecting ring; 3.4. Ear plate; 3.5. Groove; 4. Support bolt; 5. Shaft bolt; 6. Fastening nut. DETAILED DESCRIPTION

[0031] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0032] refer to Figure 1 A buckle-type clamp for fixing a six-dimensional force sensor comprises a connecting plate 1, a base 2 and a clamping jaw 3; the connecting plate 1 is used to fix the six-dimensional force sensor; the base 2 is connected to the connecting plate 1, and a clamping jaw 3 is provided on the base 2; the clamping jaw 3 comprises a left clamping jaw 3.1 and a right clamping jaw 3.2, both of which are hinged to the base 2 and are used to form a clamping cavity for clamping a component to be measured; an ear plate 3.4 is provided on the side of the left clamping jaw 3.1 away from the clamping cavity and a side of the right clamping jaw 3.2 away from the clamping cavity, and a supporting bolt 4 matching the ear plate 3.4 is further provided on the base 2, which is used for the supporting bolt 4 to press against the ear plate 3.4 from the base 2 toward the ear plate 3.4.

[0033] refer to Figure 2 The bolt holes on the connecting disk 1 include a sensor connecting bolt through hole 1.1 and a shaft bolt through hole 1.2, wherein the sensor connecting bolt through hole 1.1 is arranged at the four corners of the connecting disk corresponding to the six-dimensional force sensor mounting hole positions. In order to avoid limited installation space between the sensor connecting bolt and the clamp 3, the sensor connecting bolt through hole 1.1 is countersunk; the shaft bolt through hole 1.2 is countersunk on the side of the connecting disk 1 close to the six-dimensional force sensor, ensuring that the shaft bolt 5 can be pushed into the shaft bolt through hole 1.2 until the shaft bolt 5 nut is flush with the near-force sensor surface of the connecting disk.

[0034] The buckle-down clamp provided in this embodiment is used to fix the connection between the six-dimensional force sensor and the bridge segment model through rod. Due to differences in parameters such as model size, test method, wind tunnel size and wind speed, different types of six-dimensional force sensors need to be selected when conducting relevant wind tunnel tests to obtain appropriate range and force measurement accuracy. The position of the installation connection hole of the six-dimensional force sensor is different from that provided in this embodiment; for six-dimensional force sensors with larger ranges, when the position of the installation connection hole of the six-dimensional force sensor corresponding to the force measuring surface exceeds the radius of the connecting disk 1 from the center of the force measuring surface, the diameter of the connecting disk 1 can be expanded. In order to minimize the influence of the deadweight of the buckle-down clamp on the effective range of the six-dimensional force sensor, rounded protrusions can also be set at corresponding positions around the connecting disk 1, and the connecting bolt through holes of the six-dimensional force sensor are set at the rounded protrusion positions.

[0035] refer to Figure 3 and Figure 4 The left clamping jaw 3.1, the right clamping jaw 3.2 and the support 2 are all provided with a shaft through hole 2.2, and a shaft bolt 5 is movably arranged in the shaft through hole 2.2, so that the left clamping jaw 3.1 and the right clamping jaw 3.2 can rotate and open relative to the shaft bolt 5.

[0036] The clamp 3 is a key component of the buckle-down clamp, which is used to clamp and fix the bridge segment model through rod; the shape of the clamp 3 is a thick-walled hollow circular tube corresponding to a certain central angle of the circle, and the thick-walled hollow circular tube is cut longitudinally along the axis to be divided into two symmetrical left and right parts, and an opening is cut parallel to the upper surface of the pedestal 2 along the longitudinal axis direction at a distance upward from the center of the thick-walled hollow circular tube to ensure that the bridge segment model through rod can enter the space after the left clamp 3.1 and the right clamp 3.2 are opened and closed when the bridge segment model through rod is lowered; a rotating shaft connecting ring 3.3 is arranged below the center of the clamp 3 to form a rotating shaft through hole on the clamp. The rotating shaft connecting ring 3.3 is not arranged in a full-length manner, and the rotating shaft connecting ring 3.3 is alternately distributed at a fixed length at the lower end of the left clamp 3.1 and the right clamp 3.2, and a certain interval is set between the rotating shaft connecting rings 3.3 at the lower end of the left clamp 3.1 and the right clamp 3.2.

[0037] The support platform 2 is a flat square plate structure, and a square groove is provided on the support platform 2 to avoid interference with the clamping claws; the four corners of the support platform 2 are rounded, and the front and rear ends of the support platform 2 protrude upward to form a shaft bolt through hole for rotatably setting the shaft bolt 5.

[0038] The buckle-down clamp shown in this embodiment is light in weight and small in size, and avoids the components of this embodiment from blocking each other in space. The square groove of the support 2 is set away from the connection plate, and the corresponding clamping claw is also set away from the connection plate. This can prevent the buckle-down clamp from blocking each other in space after the sensor connection bolt is in place during operation, thereby affecting the opening and closing and clamping of the clamping claw 3;

[0039] The support platform 2 and the connecting plate 1 can be cut and processed separately and connected and fixed by fillet welds, or the connecting plate 1 and the support platform 2 can be cut and processed as a whole.

[0040] The ear plates of the left clamping jaw 3.1 and the right clamping jaw 3.2 are located at the height of their center, and the connection between the ear plate 3.4 and the left clamping jaw 3.1 and the right clamping jaw 3.2 adopts an arc transition to avoid stress concentration at the connection between the clamping jaw 3 and the ear plate 3.4 when the clamping jaw 3 is subjected to force.

[0041] refer to Figure 5 , the pedestal 2 is also provided with a support bolt through hole 2.1; a groove 3.5 is provided on the lower bottom surface of the ear plate 3.4 at a position corresponding to the support bolt through hole 2.1, for contacting with the support bolt 4. The support bolt 4 is threadedly connected with the support bolt through hole 2.1, and passes through the support bolt through hole 2.1 to contact the ear plate 3.4. The screw rod at the end of the support bolt 4 is screwed into the bottom surface of the pedestal 2 until the screw rod at the end of the support bolt 4 is pushed into the groove, and pushed up until the inner diameter of the left clamp 3.1 and the right clamp 3.2 are tightly fitted with the inner surface of the bridge segment model, so that the through rod of the bridge segment model is clamped and tightened.

[0042] refer to Figure 6 The screw end of the rotating shaft bolt 5 is also provided with a fastening nut 6.

[0043] The shaft bolt 5 successively passes through the shaft bolt through hole 1.2, the shaft through hole 2.2 at the rear end of the support platform 2, the shaft connecting ring 3.3 at the lower end of the clamp 3 and the shaft through hole 2.2 at the front end of the support platform 2, and then the nut matching the shaft bolt 5 is screwed into the end screw of the shaft bolt 5 until the nut is against the front surface of the support platform 2 and tightened.

[0044] In the above specific implementation manner, a buckle-type clamp for fixing a six-dimensional force sensor provided by the present invention comprises a connecting plate 1, a base 2, a clamping claw 3, a supporting bolt 4, and a rotating shaft bolt 5; when in use, the rotating shaft bolt 5 is first inserted into the rotating shaft bolt through hole reserved in the rear end plane of the connecting plate, and then the rear end plane of the connecting plate 1 is closely attached to the force measuring surface of the six-dimensional force sensor, and the corresponding connecting bolt is screwed into the sensor connecting bolt through hole 1.1 reserved in the front end plane of the connecting plate 1, and the rotating shaft bolt 5 successively passes through the rear end of the base 2, the clamping claw 3, and the front end of the base 2, and the rotating shaft bolt 5 is threaded. The end of the rod protrudes from the front end of the pedestal and is screwed into the corresponding nut for tightening. After the clamp 3 is opened around the rotating shaft bolt, the through rod at one end of the bridge segment model is lowered from the opening to the inner diameter of the clamp 3, and the ear plate 3.4 of the clamp 3 is pushed to drive the clamp 3 back to the equilibrium position so that the inner wall of the clamp 3 is tightly fitted to the outer diameter of the through rod of the segment model. Then the support bolt 4 is screwed into the reserved through hole from the lower bottom surface of the pedestal 2 until the end of the screw rod of the support bolt 4 is pushed to the groove 14 on the lower bottom surface of the clamp ear plate 3.4 to lock the position of the through rod of the segment model, thereby achieving the purpose of connecting the segment model with the six-dimensional force sensor. Different from the traditional installation process, the buckle-type clamp for fixing the six-dimensional force sensor provides a simple instrument and equipment installation method, which reduces the manpower input during the installation process to a certain extent, and can improve the efficiency of model replacement during the test process, effectively reducing the problem of sensor effective range reduction caused by the connection mechanism itself, and improving the efficiency and accuracy of the aerodynamic test of the six-dimensional force sensor of the bridge segment model.

[0045] For wind tunnel tests, it is sometimes necessary to frequently change test conditions. If different test conditions correspond to different test models, the tester needs to frequently change the test models. Due to the installation space limitations at both ends, the traditional wall-mounted six-dimensional force sensor connection method usually requires the connector and the six-dimensional force sensor to be removed as a whole for replacement. During the replacement process, multiple people are usually required to assist, and the replacement process greatly wastes manpower and time resources. The present embodiment provides a buckle-type six-dimensional force sensor connector, which is installed and connected by a pair of clamping claws. The test model can be lifted out of the test bench from above by only unscrewing the clamping claw support bolts. Similarly, the new test model can also be lowered from above to the clamping claw of the buckle-type connector, and then tightened by screwing in the support bolts to complete the replacement, which is convenient and quick.

[0046] The six-dimensional force sensor commonly used in wind tunnel tests often conducted in bridge wind engineering is also called a force balance. It is a test sensor that is sensitive to force changes, responds quickly, and improves test accuracy. Depending on different experimental conditions such as the size of the wind tunnel laboratory, the size of the test model, and the test wind speed range, different types of six-dimensional force sensors can be selected to complete the force measurement; different types of six-dimensional force sensors have different ranges and force measurements. Generally, the smaller the range, the higher the test accuracy of the six-dimensional force sensor; for different test objects, the installation and connection methods of the six-dimensional force sensor are also different, usually divided into horizontal installation and wall-mounted installation; the six-dimensional force sensor buckle clamp provided by this embodiment is suitable for wall-mounted installation of the six-dimensional force sensor. The existing six-dimensional force sensor wall-mounted installation usually adopts a flange connection, and the flange It includes three parts: an upper flange, a lower flange and an expansion connector. When the above-mentioned flange connection is used, the three parts themselves have a large mass. Before the six-axis force sensor officially works, a large gravity has been applied in the vertical direction. Even if the six-axis force sensor can be reset during the experiment, its test absolute range will be reduced by the corresponding value. At the same time, due to the existence of the expansion connector, when the upper flange is connected to the lower flange by tightening, tension will be generated between the upper and lower flanges. The tension will be transmitted to the force measuring surface of the six-axis force sensor through the lower flange. The existence of this tension will lead to a reduction in the effective range of the six-axis force sensor in the axial degree of freedom.

[0047] The connecting disk 1 is a circular disk structure, and one side of the connecting disk 1 is tightly fitted with the force measuring surface of the six-dimensional force sensor and is fixedly connected by bolts.

[0048] In order to improve the clamping and tightening ability of the clamp 3 and prevent the bridge segment model through rod and the clamp 3 from rotating relative to each other, this embodiment adheres a rubber anti-skid layer to the inner diameter surface of the clamp 3 to increase the friction between the clamp 3 and the segment model through rod and enhance the clamping ability of the clamp.

[0049] The supporting bolt 4 is a hexagon socket bolt.

[0050] The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be modified and varied in various ways within the spirit and principles of the present invention.

Claims

1. A buckle-type fixture for fixing a six-dimensional force sensor, characterized in that: It comprises a connecting plate (1), a support platform (2) and a clamping claw (3); The connection plate (1) is used for fixedly connecting the six-dimensional force sensor; The support platform (2) is connected to the connecting plate (1), and a clamping claw (3) is provided on the support platform (2); The clamping jaw (3) comprises a left clamping jaw (3.1) and a right clamping jaw (3.2); the left clamping jaw (3.1) and the right clamping jaw (3.2) are both hinged to the support platform (2) and are used to form a clamping cavity for clamping the component to be tested; The left clamping jaw (3.1) and the right clamping jaw (3.2) are both provided with ear plates (3.4) on one side away from the clamping cavity, and the support platform (2) is also provided with support bolts (4) matching the ear plates (3.4) so ​​that the support bolts (4) can abut against the ear plates (3.4) from the support platform (2) toward the ear plates (3.4); The left clamping jaw (3.1), the right clamping jaw (3.2) and the support platform (2) are all provided with a rotation axis through hole (2.2), and a rotation axis bolt (5) is movably arranged in the rotation axis through hole (2.2) for rotating the left clamping jaw (3.1) and the right clamping jaw (3.2) relative to the rotation axis bolt (5) to open and close; The buckle-down fixture is used to connect the test model and the six-dimensional force sensor in a wind tunnel test.

2. A buckle-down clamp for fixing a six-dimensional force sensor according to claim 1, characterized in that: The connection between the ear plate (3.4) and the left clamping jaw (3.1) and the right clamping jaw (3.2) adopts an arc-shaped transition, and a corresponding groove (3.5) is provided on the ear plate (3.4) at the abutment with the support bolt (4).

3. A buckle-down clamp for fixing a six-dimensional force sensor according to claim 1, characterized in that: The end of the screw rod of the rotating shaft bolt (5) is also provided with a fastening nut (6).

4. A buckle-down clamp for fixing a six-dimensional force sensor according to claim 1, characterized in that: A support bolt through hole (2.1) is also provided on the support platform (2); the support bolt (4) is threadedly connected to the support bolt through hole (2.1) and passes through the support bolt through hole (2.1) to abut against the ear plate (3.4).

5. The buckle-down clamp for fixing a six-dimensional force sensor according to claim 1, characterized in that: The connection disk (1) is a circular disk structure, and one side of the connection disk (1) is tightly fitted with the force measuring surface of the six-dimensional force sensor and is fixedly connected by bolts.

6. A buckle-down clamp for fixing a six-dimensional force sensor according to claim 5, characterized in that: The bolt holes on the connection plate (1) are countersunk on the side facing away from the sensor.

7. A buckle-down clamp for fixing a six-dimensional force sensor according to claim 1, characterized in that: The support platform (2) is a square plate structure, and a square groove is provided on the support platform (2).

8. The buckle-down clamp for fixing a six-dimensional force sensor according to claim 7, characterized in that: The four corners of the support platform (2) are rounded.

9. The buckle-down clamp for fixing a six-dimensional force sensor according to claim 1, characterized in that: The supporting bolt (4) is a hexagon socket bolt.

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