CN220084558U - Loading measurement system of key connection force detection experiment system - Google Patents
Loading measurement system of key connection force detection experiment system Download PDFInfo
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- CN220084558U CN220084558U CN202321444585.7U CN202321444585U CN220084558U CN 220084558 U CN220084558 U CN 220084558U CN 202321444585 U CN202321444585 U CN 202321444585U CN 220084558 U CN220084558 U CN 220084558U
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Abstract
The loading measurement system of the key connection force detection experiment system is characterized in that a supporting plate and a loading mechanism are arranged on a base, one end of a loading force arm is connected with the loading mechanism, the other end of the loading force arm is connected with the supporting plate through the key connection mechanism, an industrial camera is arranged at a position opposite to the key connection mechanism, and the industrial camera is connected with a computer through a data transmission line; the outer support fixedly arranged in the loading mechanism is provided with a second pulley, the supporting plate is provided with a third pulley, and a steel wire rope positioned between the second pulley and the third pulley is parallel to the moving plane of the loading force arm and is close to one section of the key connecting mechanism for digital speckle treatment. The utility model improves the prior art, increases the steel wire rope and carries out digital speckle treatment on the steel wire rope, obtains a theoretical value of the applied force through the displacement of the steel wire rope, measures the actual value of the key stress through the key deformation, compares the theoretical value with the actual value, and verifies the scientificity and the accuracy of the key connection force detection experiment system.
Description
Technical Field
The utility model relates to a mechanical design experiment teaching instrument, in particular to a loading measurement system of a key connection force detection experiment system.
Background
In the existing CN110261027a key connection force detection experiment system, the stress condition of key connection is measured by analyzing the image shot at high speed, when the camera shoots the key strain image, the lens can only be pulled as close as possible due to the smaller spline and flat key, so that the picture can be conveniently amplified and then analyzed. But the shooting area becomes smaller at this time, the image data of the loading arm of force can not be shot, and because the stress deformation of the key is very small in the process of applying force, in order to clearly shoot the deformation, the industrial camera can only shoot the image of the local working condition at the key connection position in the whole system so as to realize clear shooting of the stress deformation of the key connection, therefore, when the stress deformation of the key connection occurs at any moment, the deformation corresponding to the stress loading arm of force generated by the loading force can not be displayed in the image.
Disclosure of Invention
In order to solve the technical problems, the utility model provides a loading measurement system of a key connection force detection experiment system.
The aim of the utility model is realized by adopting the following technical scheme. The utility model provides a loading measurement system of a key connection force detection experiment system, which comprises a base, a loading force arm, a supporting plate, a loading mechanism and a key connection mechanism, wherein the supporting plate and the loading mechanism are arranged on the base; the outer support fixedly arranged in the loading mechanism is provided with a second pulley, the support plate is provided with a third pulley, one end of the steel wire rope is fixed at the end part of the loading force arm, the other end of the steel wire rope is provided with a weight for tensioning the steel wire rope, the steel wire rope passes through the second pulley and the third pulley, and the steel wire rope between the second pulley and the third pulley is parallel to the moving plane of the loading force arm and is close to one section of the key connecting mechanism for digital speckle treatment.
Further, the loading mechanism comprises a loading bolt, the loading bolt is in threaded connection with an outer support of the loading mechanism, the outer support is fixed on a base, an intermediate frame is arranged in the outer support in a vertically free sliding mode, balls are nested at the lower end of the loading bolt and abut against the top of the intermediate frame, a sensor and an inner support are arranged in the intermediate frame, the top of the sensor is fixedly connected with the bottom of the inner support, the inner support is hung in a groove at the end part of a loading force arm, and the bottom of the sensor is arranged at the bottom of the intermediate frame; in the formal measurement, the middle frame is directly connected with the inner bracket.
Furthermore, a cushion block is arranged in the groove at the end part of the loading arm so as to adjust the height of the inner bracket lifted in the groove.
Further, the key connection mechanism comprises an outer ring installed at the other end part of the loading force arm, and an inner ring nested in the outer ring and connected with the outer ring through a flat key, wherein the inner ring is connected with a spline key to be measured, and the spline to be measured is arranged on the supporting plate through a hollow shaft.
Further, the end part of the loading arm is provided with a first pulley for fixing the steel wire rope, the second pulley and the third pulley are positioned at the same height, and the plane where the sliding grooves on the second pulley and the third pulley are together positioned is parallel to the moving plane of the loading arm.
Further, the loading mechanism is provided with a sensor for detecting loading force and a dial indicator for measuring loading displacement, and the sensor is connected with the computer through a data transmission line.
Compared with the prior art, the utility model has the following advantages: the utility model improves the prior art, adds the steel wire rope and carries out digital speckle treatment on the steel wire rope, one end of the steel wire rope is arranged at the end part of the loading arm of force, the other end of the steel wire rope is tensioned by using the counterweight, and the digital speckle mark of the steel wire rope is close to the key, so that an industrial camera can shoot the displacement of the steel wire rope and the stress deformation condition of the key at the same time, and then the deformation of the applied arm of force can be calculated through analysis and calculation of the applied force by the existing detection data processing system.
The foregoing description is only an overview of the present utility model, and is intended to be implemented in accordance with the teachings of the present utility model, as well as the preferred embodiments thereof, together with the following detailed description of the utility model, given by way of illustration only, together with the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of an embodiment of a loading measurement system of a key connection force detection experiment system according to the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
An embodiment of a load measurement system of a key connection force detection experiment system of the present utility model is shown in fig. 1.
The utility model improves on the basis of the traditional CN110261027A key connection force detection experimental system, and adds three pulleys, a steel wire rope subjected to digital speckle treatment and weights serving as counter weights on the basis of the key connection force detection experimental system. The key connection force detection experimental system can be used for enabling each image shot by the industrial camera to contain deformation of keys and loading force arms caused by the application of force by the loading mechanism during experiments.
The existing key connection force detection experiment system comprises a base 1, a loading force arm 3, a supporting plate 2, a loading mechanism 4 and a key connection mechanism 5, wherein the supporting plate 2 and the loading mechanism 4 are arranged on the base 1, one end of the loading force arm 3 is connected with the loading mechanism 4, and the other end of the loading force arm is connected with the supporting plate 2 through the key connection mechanism 5.
An industrial camera is arranged at the position opposite to the key connection mechanism 5, and the industrial camera is connected with a computer through a data transmission line. The loading bolt 44 is screwed to the outer bracket 41 of the loading mechanism 4, and the outer bracket 41 is fixed to the base 1. The lower end of the loading bolt 44 is nested with balls, the balls are abutted against the top of the intermediate frame 42, the intermediate frame 42 is arranged in the outer bracket 41 in a vertically free sliding manner, and the sensor 46 and the inner bracket 43 are arranged in the intermediate frame 42. The top of the sensor 46 is fixedly connected with the bottom of the inner bracket 43, the inner bracket 43 is hoisted in the groove at the end part of the loading arm 3, and the height of the inner bracket 43 hoisted in the groove can be adjusted by additionally arranging a cushion block in the groove, and the bottom of the sensor 46 is arranged at the bottom of the middle frame 42. The sensor 46 is connected to a computer.
The key connection mechanism 5 comprises an outer ring 51 arranged at the other end part of the loading arm 3, and an inner ring 52 nested in the outer ring 51 and connected with the outer ring 51 through a flat key 58, wherein the inner ring 52 is in key connection with a spline 59 to be measured, and the spline 59 to be measured is arranged on the supporting plate 2 through the hollow shaft 21.
Other specific structures of the system are disclosed in the conventional CN110261027a key connection force detection experimental system, and are not described herein.
With this system, the force deformation of the key connection 5 and the force deformation of the loading arm 3 can be measured. Before formal measurement, firstly setting parameters such as an angle, an aperture and the like of an industrial camera, opening the industrial camera and a computer, and rotating a loading bolt 44 to enable the loading bolt 44 to move downwards; during downward movement of the load bolt 44, a downward force is applied to the intermediate frame 42 by the balls. Under the action of the loading bolt 44, the middle frame 42 drives the inner bracket 43 to move downwards through the sensor 46, and since the inner bracket 43 is installed in the groove of the loading arm 3, the inner bracket 43 applies downward action to the end of the loading arm 3, and the sensor 46 measures the force and displays the force on the computer display. Before formal measurement, the loading mechanism 4 is further provided with a dial indicator for measuring the displacement of the end part of the loading arm 3, in this embodiment, the contact of the dial indicator may be abutted against the outer support 41 or the base 1, the body of the dial indicator may be disposed in a part of the middle frame, the inner support, the end part of the loading arm, and the like, which moves along with the loading force, and the movable part is driven to move under the action of the loading force, so as to drive the body of the dial indicator to move, and further, the moving amount may be read from the dial indicator, and the displacement of the end part of the loading arm 3 is measured.
In other embodiments of the utility model, the sensor 46 may be positioned between a load arm and a load bolt, the load bolt applying a load force to the sensor, the sensor transmitting the force to the load arm, the sensor transmitting the load force to the computer. The contact of the dial indicator can be propped against the lower end face of the end part of the loading force arm, the body of the dial indicator is fixed on the outer support, and the displacement can be read out on the dial indicator along with the downward movement of the loading force arm. In other embodiments of the present utility model, the present utility model may be not limited to the above-described structure, as long as the force applied by the loading bolt 44 to the loading arm 3 passes through the sensor 46, and one of the body and the contact of the dial indicator is fixed, and the other may move along with the end of the loading arm.
During formal measurement, the sensor and the dial indicator are removed, and in the embodiment, the middle frame can be directly connected with the inner bracket for applying loading force to the loading force arm; in other embodiments, the load bolt may be directly abutted against the load arm.
During formal measurement, the loading force drives the outer ring 51 mounted on the loading arm 3 to rotate relatively around the inner ring 52, and the flat key 58 blocks the relative movement of the inner ring 52 and the outer ring 51, so that under the action of the acting force, the two sides of the flat key 58 are strained, and at the moment, the inner ring 52 can generate a force for blocking the movement of the outer ring 51, the force is transmitted to the spline 59 to be measured through the inner ring 52, and the spline 59 to be measured is fixedly connected on the hollow shaft 21 and cannot rotate relative to the hollow shaft, so that under the action of the acting force, the strain is generated on the two sides of the spline 59 to be measured, and an image of the deformation process of the flat key 58, the inner ring 52, the outer ring 51 and the spline 59 to be measured is shot by an industrial camera. And analyzing the image data by the existing detection data processing system to obtain the deformation. The detection data processing system is based on the existing digital speckle correlation method, and the images of the whole process before and after the stress of the key connection are compared and calculated to obtain a strain result.
The improvement scheme of the utility model can solve the problem that each image shot by the industrial camera in the prior art can not record the force applied by the loading device in the experiment. The stress condition of the key connection is measured by analyzing the image shot at high speed, and when the camera shoots the key strain image, the lens can only be pulled as close as possible due to the fact that the spline and the flat key are smaller, so that the image can be conveniently amplified and then analyzed. However, the shooting area is smaller at this time, the data of the loading moment arm cannot be shot, and because the stress deformation of the key is very small in the process of applying force, in order to clearly shoot the deformation, the industrial camera can only shoot the image of the local working condition at the key connection position in the whole system so as to clearly shoot the stress deformation of the key connection, so that the size of the loading force applied to the loading moment arm corresponds to the situation that the stress of the key connection cannot be displayed at any moment in the image. Therefore, the prior art is improved, a steel wire rope is added, digital speckle processing is carried out on the steel wire rope, one end of the steel wire rope is arranged at the end part of a loading force arm, the other end of the steel wire rope is tensioned by a counterweight, the digital speckle mark of the steel wire rope is close to a key, and an industrial camera can shoot the displacement of the steel wire rope and the stress deformation condition of the key at the same time, so that the displacement of the applied force arm can be analyzed and calculated through the existing detection data processing system, and the applied force can be calculated. Therefore, each image can correspond the stress condition of the key connection to the force applied by the loading device, the theoretical value of the applied force is obtained through the displacement of the steel wire rope, the actual value of the stress of the key is measured through the deformation of the key, the theoretical value and the actual value are compared, and the scientificity and the accuracy of the key connection force detection experimental system are verified.
The specific structure of the embodiment of the utility model is as follows: on the basis of the existing key connection force detection experiment system, a first pulley 6 is welded at the end part of a loading force arm 3, a second pulley 7 is fixed on an outer support 41, a third pulley 8 is fixed on a supporting plate 2, the second pulley 7 and the third pulley 8 are positioned at equal height positions, and the planes of sliding grooves on the second pulley 7 and the third pulley 8 are parallel to the moving plane of the loading force arm 3. One end of the steel wire rope 9 is fixed on the first pulley 6, and the other end is tied with a weight (weight 10) and sequentially passes through the sliding grooves of the second pulley 7 and the third pulley 8, so that the horizontal section of the steel wire rope 9 is parallel to the moving plane of the loading arm 3. One of the horizontal sections of the wire rope 9, which is close to the key, is subjected to digital speckle processing. The weight at the other end of the steel wire rope 9 tightens the steel wire rope.
When the loading arm of force receives loading force and takes place deformation, drive wire rope 9's one end down to make wire rope's horizontal segment take place the displacement, thereby drive the digital speckle mark on the wire rope 9 and remove, the industry camera also can shoot wire rope 9's displacement when the shooting key warp.
The measuring working principle process of the utility model is as follows: before a formal experiment, the original key connection force detection experiment system is utilized to apply force on the loading force arm 3, the readings of the sensor 46 and the dial indicator are recorded, and the rigidity K of the loading force arm is calculated. In the formal experiment, the sensor 46 and the dial indicator are detached, the steel wire rope 9 is installed on each pulley, the horizontal section of the steel wire rope 9 is parallel to the moving plane of the loading arm 3, the angle, focal length, aperture, exposure rate and other parameters of the industrial camera are set, the industrial camera can shoot digital speckle marks on keys and the steel wire rope at the same time, and the computer display can display the keys and the digital speckle marks of the steel wire rope at the same time. The loading bolt 44 is rotated, so that the loading bolt 44 applies downward pressure to the loading arm 3, one end of the wire rope 9 moves downward along with the loading arm 3, the wire rope 9 sprayed with the digital speckle marks generates displacement (illustrated by the azimuth of fig. 1 as an example) with equal length and leftwards, and the industrial camera shoots the digital speckle marks of the keys and the wire rope in the whole loading process. The computer is provided with an existing detection data processing system, and the system can analyze the position change of the digital speckle marks of the steel wire rope and the keys and calculate the displacement based on a digital speckle correlation method.
The calculation formula of the applied force applied to the structure subjected to the stress deformation is as follows:
K＝P/δ
wherein: the stiffness of the K-structure, which refers to the ability of the elastomer to resist deformation and stretching, N/mm;
p-constant force acting on the structure N;
delta-deformation due to force, mm.
Before a formal experiment, using a sensor and a dial indicator to record the value of force and displacement value applied each time, and calculating the rigidity K of a loading arm;
during formal experiments, the sensor and the dial indicator are removed, a steel wire rope is arranged, loading, shooting and analysis are carried out, the deformation displacement delta of the descending of the loading arm is obtained according to the horizontal displacement of the digital speckle marking position of the steel wire rope obtained through analysis, the rigidity K of the manufactured loading arm is obtained through the method, and the following formula is adopted:
P＝K·δ
the force P applied to the loading arm can be calculated.
The steel wire rope is displaced by applying force to the loading arm of force, is shot by an industrial camera, and is analyzed and calculated by utilizing the existing detection data processing system to obtain the displacement of the steel wire rope and the deformation displacement of the loading arm of force, so that the theoretical value of the applied force is obtained; the deformation generated by the stress of the key is shot, then the deformation is obtained through analysis and calculation of a detection data processing system, and further the measured value of the force is obtained, the theoretical value and the measured value are compared, and the scientificity and the accuracy of the key connection force detection experiment system are verified.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the spirit and scope of the utility model as defined by the appended claims and their equivalents.
Claims (6)
1. The utility model provides a load measurement system of key connection power detection experiment system, includes base, load arm of force, backup pad, loading mechanism, key connection mechanism, backup pad, loading mechanism set up on the base, and the one end and the loading mechanism of load arm of force are connected, and the other end passes through key connection mechanism and is connected its characterized in that with the backup pad: setting an industrial camera at the position opposite to the key connecting mechanism, wherein the industrial camera is connected with a computer through a data transmission line; the outer support fixedly arranged in the loading mechanism is provided with a second pulley, the support plate is provided with a third pulley, one end of the steel wire rope is fixed at the end part of the loading force arm, the other end of the steel wire rope is provided with a weight for tensioning the steel wire rope, the steel wire rope passes through the second pulley and the third pulley, and the steel wire rope between the second pulley and the third pulley is parallel to the moving plane of the loading force arm and is close to one section of the key connecting mechanism for digital speckle treatment.
2. The load measurement system of a key joint force detection experiment system according to claim 1, wherein: the loading mechanism comprises a loading bolt, the loading bolt is in threaded connection with an outer support of the loading mechanism, the outer support is fixed on a base, an intermediate frame is arranged in the outer support in a vertically free sliding mode, balls are nested at the lower end of the loading bolt and abut against the top of the intermediate frame, a sensor and an inner support are arranged in the intermediate frame, the top of the sensor is fixedly connected with the bottom of the inner support, the inner support is hung in an end groove of a loading force arm, and the bottom of the sensor is arranged at the bottom of the intermediate frame; in the formal measurement, the middle frame is directly connected with the inner bracket.
3. The load measurement system of a key joint force detection experiment system according to claim 2, wherein: and a cushion block is arranged in the groove at the end part of the loading arm so as to adjust the height of the inner bracket lifted in the groove.
4. The load measurement system of a key joint force detection experiment system according to claim 1, wherein: the key connection mechanism comprises an outer ring arranged at the other end part of the loading arm, and an inner ring nested in the outer ring and connected with the outer ring through a flat key, wherein the inner ring is connected with a spline key to be measured, and the spline to be measured is arranged on the supporting plate through a hollow shaft.
5. The load measurement system of a key joint force detection experiment system according to claim 1, wherein: the end part of the loading arm is provided with a first pulley for fixing the steel wire rope, the second pulley and the third pulley are positioned at equal height positions, and the plane where the sliding grooves on the second pulley and the third pulley are positioned together is parallel to the moving plane of the loading arm.
6. The load measurement system of a key joint force detection experiment system according to claim 1, wherein: the loading mechanism is provided with a sensor for detecting loading force and a dial indicator for measuring loading displacement, and the sensor is connected with the computer through a data transmission line.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321444585.7U CN220084558U (en) | 2023-06-07 | 2023-06-07 | Loading measurement system of key connection force detection experiment system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202321444585.7U CN220084558U (en) | 2023-06-07 | 2023-06-07 | Loading measurement system of key connection force detection experiment system |
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| CN220084558U true CN220084558U (en) | 2023-11-24 |
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| CN202321444585.7U Active CN220084558U (en) | 2023-06-07 | 2023-06-07 | Loading measurement system of key connection force detection experiment system |
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- 2023-06-07 CN CN202321444585.7U patent/CN220084558U/en active Active
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