CN113091981A - Sensor with pretightening force and measuring method - Google Patents
Sensor with pretightening force and measuring method Download PDFInfo
- Publication number
- CN113091981A CN113091981A CN202110280839.5A CN202110280839A CN113091981A CN 113091981 A CN113091981 A CN 113091981A CN 202110280839 A CN202110280839 A CN 202110280839A CN 113091981 A CN113091981 A CN 113091981A
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- force
- sensor
- floating platform
- pretightening
- platform
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/24—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for determining value of torque or twisting moment for tightening a nut or other member which is similarly stressed
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/16—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring several components of force
Abstract
The invention discloses a sensor for setting pretightening force, which comprises a floating platform, a fixed platform, a force measuring unit arranged between the floating platform and the fixed platform, and a pretightening force applying device connected with the floating platform, wherein the force measuring unit is used for measuring the stress of the floating platform, the pretightening force applying device comprises a fixed support and a pretightening force device, the pretightening force device comprises a pretightening nut, the fixed support is fixedly connected with the fixed platform, the pretightening force device is connected between the floating platform and the fixed support, and the pretightening force is applied to the floating platform by adjusting the pretightening nut of the pretightening force device. The sensor can realize the separation of the dead weight N of a test object or a large load needing to be balanced from a small load to be measured, so that the load to be measured can be more accurately measured by the force measuring unit of the sensor. The sensor has the advantages of high precision, simple structure, convenient use, adjustable pretightening force and thorough structural decoupling. The invention also discloses a measuring method of the sensor.
Description
Technical Field
The invention relates to a mechanical force transducer, in particular to a transducer with pretightening force and a measuring method.
Background
A multicomponent sensor is a device that detects full force information in three dimensions, typically including three-dimensional force information (F)x，Fy，Fz) And three-dimensional moment information (M)x，My，Mz) The method is mainly applied to the occasions of force and moment position control, such as contour tracking, precision assembly, multi-dimensional force information detection in a test system and the like. The force measuring unit in the Y direction (gravity direction) can measure the dead weight N of a test object and the force applied by the external load F to the sensor in the Y direction, and in an actual test, the dead weight N of the test object is very large, and the applied external load F is relatively small, so that the selection of the measuring range of the force measuring unit is influenced. At the moment, if a conventional multi-component sensor is still selected, not only the measurement of the external load F is inaccurate, but also the large load interferes with other direction components, so that the measurement of other direction components is also inaccurate, and the experimental result is influenced.
Disclosure of Invention
The purpose of the invention is as follows: in view of the above disadvantages, the present invention provides a multi-component sensor for trimming a large load by setting a pre-tightening force to measure a small load.
The invention also provides a measuring method of the sensor.
The technical scheme is as follows: in order to solve the problems, the invention adopts a sensor for setting pretightening force, which comprises a floating platform, a fixed platform, a force measuring unit arranged between the floating platform and the fixed platform, and a pretightening force applying device connected with the floating platform, wherein the force measuring unit is used for measuring the stress of the floating platform, the pretightening force applying device comprises a fixed support and a pretightening force device, the pretightening force device comprises a pretightening nut, the fixed support is fixedly connected with the fixed platform, the pretightening force device is connected between the floating platform and the fixed support, and the pretightening force is applied to the floating platform by adjusting the pretightening nut of the pretighte.
Has the advantages that: compared with the prior art, the invention has the obvious advantages that the separation of the dead weight N of the test object or the large load to be balanced from the small load to be measured can be realized, so that the load to be measured can be more accurately measured by the force measuring unit of the sensor. The sensor has the advantages of high precision, simple structure, convenient use, adjustable pretightening force and thorough structural decoupling.
Furthermore, the force measuring unit comprises a Y-direction force measuring unit for measuring Y-direction stress and moment, an X-direction force measuring unit for measuring X-direction stress and moment, and a Z-direction force measuring unit for measuring Z-direction stress and moment, wherein the X-direction, the Y-direction and the Z-direction are three directions of coordinate axes in a space rectangular coordinate system, and the positive direction of the Y-direction is upward along the gravity direction.
Furthermore, the pre-tightening device further comprises a first single-component force sensor, the first single-component force sensor measures pre-tightening force applied by the pre-tightening nut, and the pre-tightening device is connected with the floating platform and the fixed support through flexible hinges.
Furthermore, the Y-direction force measuring unit comprises a second single-component force sensor, the floating platform is connected with the fixed platform through a first supporting piece, and the second single-component force sensor is arranged between the first supporting piece and the floating platform.
Furthermore, the X-direction force measuring unit comprises a third single-component force sensor, a second supporting piece is fixedly arranged on the fixed platform, the extending direction of the second supporting piece is parallel to the X direction, one end of the second supporting piece is fixedly connected with the fixed platform, the other end of the second supporting piece is connected with the floating platform, and the third single-component force sensor is arranged between the second supporting piece and the floating platform.
Furthermore, the Z-direction force measuring unit comprises a fourth single-component force sensor, a third supporting piece is fixedly arranged on the fixed platform, the extending direction of the third supporting piece is parallel to the Z direction, one end of the third supporting piece is fixedly connected with the fixed platform, the other end of the third supporting piece is connected with the floating platform, and the fourth single-component force sensor is arranged between the third supporting piece and the floating platform.
A measuring method of the sensor comprises the following steps:
(1) presetting the force and the direction of the force which needs to be pre-tightened when an external load is applied;
(2) adjusting a pre-tightening nut in the same direction as the direction of the force preset in the step (1), arranging a single component force sensor matched with the pre-tightening nut, and detecting the real-time pre-tightening force of the pre-tightening nut on the floating platform through the single component force sensor until the pre-tightening force of the pre-tightening nut on the floating platform is equal to the force preset in the step (1);
(3) applying an external load to the floating platform;
(4) the force measuring unit measures the external load.
Drawings
FIG. 1 is a schematic diagram of the construction of a sensor according to the present invention;
FIG. 2 is a front view of the sensor of the present invention;
FIG. 3 is a schematic diagram of the construction of the pretensioning device in the sensor according to the invention;
fig. 4 is a schematic view of the connection relationship between the first support, the second support and the third support of the sensor of the present invention and the fixed platform.
Detailed Description
As shown in fig. 1 and fig. 2, a sensor for setting a pretightening force in this embodiment includes a floating platform 1, a fixed platform 2, a force measuring unit disposed between the floating platform 1 and the fixed platform 2 for measuring a force applied to the floating platform 1, and a pretightening force applying device connected to the floating platform 1, in this embodiment, the force measuring unit includes a Y-direction force measuring unit for measuring a force and a moment in a Y-direction, an X-direction force and a moment in an X-direction, and a Z-direction force measuring unit for measuring a force and a moment in a Z-direction, the sensor is a six-component sensor, the X-direction, the Y-direction, and the Z-direction are three directions of coordinate axes in a spatial rectangular coordinate system, wherein a positive direction of the Y-direction is.
The pretightening force applying device comprises a fixed support and a pretightening force device, and the fixed support comprises a first fixed support 7, a second fixed support 9 and a third fixed support 11; the pre-tightening device comprises a first pre-tightening device 6, a second pre-tightening device 8 and a third pre-tightening device 10; one end of the first pre-tightening device 6 is connected with the first fixed support 7 through a flexible hinge 14, the other end of the first pre-tightening device is connected with the floating platform 1 through the flexible hinge 14, and the first pre-tightening device 6 applies pre-tightening force in the Y direction to the floating platform 1; one end of a second pre-tightening device 8 is connected with a second fixed support 9 through a flexible hinge 14, the other end of the second pre-tightening device is connected with the floating platform 1 through the flexible hinge 14, and the second pre-tightening device 8 applies pre-tightening force in the Z direction to the floating platform 1; one end of a third pre-tightening device 10 is connected with the third fixed support 11 through a flexible hinge 14, the other end of the third pre-tightening device is connected with the floating platform 1 through the flexible hinge 14, and the third pre-tightening device 10 applies pre-tightening force in the X direction to the floating platform 1.
As shown in fig. 3, each of the first pre-tightening device 6, the second pre-tightening device 8, and the third pre-tightening device 10 includes a pre-tightening nut 13 and a first single-component force sensor 12, the pre-tightening force is applied to the floating platform 1 by adjusting the pre-tightening nut 13, and the first single-component force sensor 12 can measure the pre-tightening force applied by the pre-tightening nut 13.
As shown in fig. 4, the Y-direction force measuring unit includes a second single component force sensor 51, the floating platform 1 is connected to the fixed platform 2 through a first support member, in this embodiment, four first support members (31, 32, 33, and 34) are provided, the four first support members are respectively connected to four corners of the floating platform 1, the second single component force sensor 51 is provided between the first support members and the floating platform 1, and the second single component force sensor 51 measures the load in the Y-direction applied to the floating platform 1.
The X-direction force measuring unit comprises a third single-component force sensor 52, the second supporting piece 35 is fixedly arranged on the fixed platform 2, the extending direction of the second supporting piece is parallel to the X direction of the fixed platform 2, one end of the second supporting piece 35 is fixedly connected with the fixed platform 2, the other end of the second supporting piece 35 is connected with the floating platform 1, the third single-component force sensor 52 is arranged between the second supporting piece 35 and the floating platform 1, and the third single-component force sensor 52 measures the load of the floating platform 1 in the X direction.
The Z direction force cell includes fourth simple component force sensor 53, the third support piece is fixed to be set up on fixed platform 2, third support piece extending direction is on a parallel with fixed platform 2's Z direction, be provided with two third support piece (36, 37) in this embodiment, two third support piece (36, 37) one end all with fixed platform 2 fixed connection, the other end all is connected with floating platform 1, all set up fourth simple component force sensor 53 between third support piece (36, 37) and the floating platform, the load of the Z direction that floating platform 1 received is measured to fourth simple component force sensor 53.
The measuring method of the sensor comprises the following steps:
(1) knowing that an external load F to be measured consists of a large load N and a small load N, and presetting the size of the large load N and the direction of the large load N of the external load F to be pre-tightened;
(2) adjusting a pre-tightening nut 13 with the same direction as the large load N preset in the step (1), and measuring that the pre-tightening force of the pre-tightening nut 13 on the floating platform 1 is equal to the large load N in the step (1) through a first single-component sensor 12;
(3) then, applying an external load F to the floating platform 1, wherein a large load N of the external load F is offset by the pretightening nut 13;
(4) the force measuring unit measures an external load; if the external load F applies force in the X direction to the floating platform 1, the large load N of the external load F is counteracted by the pre-tightening nut 13 of the third pre-tightening device 10, the small load N of the external load F is borne by the second supporting piece 35, and the actual external load is measured by the third single-component force sensor 52, so that the accurate measurement of the small load N in the load F in the X direction is realized; if the external load F applies a force in the Y direction to the floating platform 1, the large load N of the external load F is counteracted by the pretightening nut 13 of the first pretightening device 6, the small load N of the external load F is commonly born by the four first supporting pieces (31, 32, 33 and 34), and the actual external load is measured by the second single-component force sensor 51, so that the accurate measurement of the small load N in the load F in the Y direction is realized; if the external load F applies a force in the Z direction to the floating platform 1, the large load N of the external load F is counteracted by the pre-tightening nut 13 of the second pre-tightening device 8, the small load N of the external load F is shared by the two third supporting pieces (36 and 37), and the actual external load is measured by the fourth single-component force sensor 53, so that the accurate measurement of the small load N in the load F in the Z direction is realized.
When the sensor is used for measuring external load, large load N in the external load F can be offset by adjusting the pre-tightening nuts for different external loads F, the pre-tightening amount can be adjusted, the application range is wide, the sensor can accurately measure small load in the large load, and multi-component pre-tightening of the sensor is realized; and the interference of large load to other components can be eliminated, and the mechanical decoupling is more thorough.
Claims (7)
1. The sensor is characterized by further comprising a pretightening force applying device connected with the floating platform, the pretightening force applying device comprises a fixed support and a pretightening device, the pretightening device comprises a pretightening nut, the fixed support is fixedly connected with the fixed platform, the pretightening device is connected between the floating platform and the fixed support, and the pretightening force is applied to the floating platform through the pretightening nut for adjusting the pretightening device.
2. The sensor of claim 1, wherein the force cell comprises a Y-direction force cell for measuring Y-direction force and moment, an X-direction force cell for measuring X-direction force and moment, and a Z-direction force cell for measuring Z-direction force and moment, the X-direction, the Y-direction, and the Z-direction being three directions of coordinate axes in a spatial rectangular coordinate system, wherein the positive direction of the Y-direction is upward along the direction of gravity.
3. The sensor of claim 1, wherein the pretensioning device further comprises a first one-component force sensor that measures the pretensioning force applied by the pretensioning nut, the pretensioning device being connected to the floating platform and the stationary support by flexible hinges.
4. The sensor of claim 2, wherein the Y-direction load cell comprises a second single component force sensor, the floating platform is connected to the fixed platform by a first support, and the second single component force sensor is disposed between the first support and the floating platform.
5. The sensor of claim 2, wherein the X-direction force measuring unit comprises a third single-component force sensor, a second supporting member is fixedly disposed on the fixed platform, and the extending direction of the second supporting member is parallel to the X-direction, one end of the second supporting member is fixedly connected to the fixed platform, the other end of the second supporting member is connected to the floating platform, and the third single-component force sensor is disposed between the second supporting member and the floating platform.
6. The sensor of claim 2, wherein the Z-direction force cell comprises a fourth single component force sensor, a third support member is fixedly disposed on the fixed platform, and the third support member extends in a direction parallel to the Z-direction, one end of the third support member is fixedly connected to the fixed platform, the other end of the third support member is connected to the floating platform, and the fourth single component force sensor is disposed between the third support member and the floating platform.
7. A method of measuring a sensor according to any one of claims 1 to 6, comprising the steps of:
(1) presetting the force and the direction of the force which needs to be pre-tightened when an external load is applied;
(2) adjusting a pre-tightening nut in the same direction as the direction of the force preset in the step (1), arranging a single component force sensor matched with the pre-tightening nut, and detecting the real-time pre-tightening force of the pre-tightening nut on the floating platform through the single component force sensor until the pre-tightening force of the pre-tightening nut on the floating platform is equal to the force preset in the step (1);
(3) applying an external load to the floating platform;
(4) the force measuring unit measures the external load.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110280839.5A CN113091981A (en) | 2021-03-16 | 2021-03-16 | Sensor with pretightening force and measuring method |
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| CN202110280839.5A CN113091981A (en) | 2021-03-16 | 2021-03-16 | Sensor with pretightening force and measuring method |
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| CN113091981A true CN113091981A (en) | 2021-07-09 |
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| CN113739975A (en) * | 2021-08-27 | 2021-12-03 | 南京航空航天大学 | Structure decoupling six-dimensional force sensor |
| CN113739976A (en) * | 2021-08-27 | 2021-12-03 | 南京航空航天大学 | Six-dimensional force sensor with integrated structure decoupling |
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| CN101886961A (en) * | 2010-07-26 | 2010-11-17 | 西安理工大学 | Full-load static characteristic test device and test method of bolt joint surface unit |
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Application publication date: 20210709 |