CN114235260A - System and method for measuring assembling pretightening force of key parts of space unfolding mechanism in real time - Google Patents
System and method for measuring assembling pretightening force of key parts of space unfolding mechanism in real time Download PDFInfo
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- CN114235260A CN114235260A CN202111368758.7A CN202111368758A CN114235260A CN 114235260 A CN114235260 A CN 114235260A CN 202111368758 A CN202111368758 A CN 202111368758A CN 114235260 A CN114235260 A CN 114235260A
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- 230000007246 mechanism Effects 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000012545 processing Methods 0.000 claims abstract description 22
- 230000003750 conditioning effect Effects 0.000 claims abstract description 9
- 238000005259 measurement Methods 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims 1
- 230000036316 preload Effects 0.000 claims 1
- 238000012544 monitoring process Methods 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
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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
- G01L5/243—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 using washers
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Abstract
The invention relates to a system and a method for measuring the assembling pretightening force of key parts of a space unfolding mechanism in real time, belonging to the technical field of assembly and adjustment of the space unfolding mechanism. The system comprises: the device comprises a plurality of gasket type force sensors (3), a multi-channel data acquisition module (2) and a data processing module (1), wherein the gasket type force sensors (3) are used for acquiring pre-tightening force original signals of connecting pieces arranged on the gasket type force sensors (3); the multichannel data acquisition module (2) is used for providing driving voltage for the gasket type force sensors (3), conditioning and acquiring the pre-tightening force original signal, and converting the pre-tightening force original signal into a readable pre-tightening force electric signal; the data processing module (1) is used for processing, displaying and storing the pre-tightening force electric signal. By the invention, the real-time monitoring of the pretightening force can be realized, so that the pretightening force is accurately controlled, and the assembling precision and the performance of the space unfolding mechanism are ensured.
Description
Technical Field
The invention relates to the technical field of assembly and adjustment of space unfolding mechanisms, in particular to a system and a method for measuring the assembling pretightening force of key parts of a space unfolding mechanism in real time.
Background
In the assembling process of the space unfolding mechanism, a plurality of links of bolt connection pre-tightening exist. Taking the assembly of the unfolding arm as an example, each joint is connected with the arm rod through a bolt. In the current assembly process, a certain torque is applied to the bolt mainly through a torque wrench in the pre-tightening process, however, due to uncertainty of the bolt torsion-tension relationship and instability of manual operation, accurate control of the pre-tightening force is difficult to achieve in the actual assembly process. Due to the existence of bolt pretightening force and the accumulation of assembly errors in the assembly process, the non-uniform stress field formed inside the structure enables all parts to deform, so that the assembly state of the whole structure changes, and the assembly precision and reliability of the unfolding arm are affected. Therefore, the requirement of high-precision assembly of key links of the space unfolding mechanism cannot be met by a bolt pre-tightening mode which depends on manual experience and lacks quantitative control. Aiming at the defects of the existing means, a real-time measuring method for the assembling pretightening force of the key parts of the space unfolding mechanism is urgently needed.
Disclosure of Invention
In order to overcome the defects of the existing means, the invention aims to provide a method for measuring the assembling pretightening force of the key parts of the space unfolding mechanism in real time, so that the pretightening force is monitored in real time, the pretightening force is accurately controlled, and the assembling precision and the assembling performance of the space unfolding mechanism are ensured.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the invention provides a system for measuring the assembly pretightening force of key parts of a space unfolding mechanism in real time, which comprises: the device comprises a plurality of gasket type force sensors, a multi-channel data acquisition module and a data processing module, wherein the gasket type force sensors are used for acquiring pre-tightening force original signals of connecting pieces arranged on the gasket type force sensors; the multichannel data acquisition module is used for providing driving voltage for the gasket type force sensors, conditioning and acquiring the pre-tightening force original signal, and converting the pre-tightening force original signal into a readable pre-tightening force electric signal; and the data processing module is used for carrying out data processing, displaying and storing on the pre-tightening force electric signal.
According to one aspect of the invention, the shim-type force sensor is of a cylindrical structure, and a through hole for the connecting piece to pass through is arranged in the middle of the shim-type force sensor.
According to an aspect of the present invention, when the diameter of the through hole is larger than the diameter of the connection member, a bushing having a height lower than that of the shim type force sensor is provided in the through hole.
According to one aspect of the invention, a plurality of strain gauges are disposed around the shim force sensor to form a balanced bridge.
According to one aspect of the invention, when a pretightening force is generated in the connecting piece, the balance bridge is out of balance, and the gasket type force sensor feeds back a generated electric signal to the multichannel data acquisition module.
According to one aspect of the invention, anti-wear washers are respectively arranged at both ends of the shim-type force sensor;
a fitting washer is provided on the head side of the connecting member.
According to one aspect of the invention, the connector is a bolt.
The invention also provides a method for measuring the assembling pretightening force of the key parts of the space unfolding mechanism in real time by using the system for measuring the assembling pretightening force of the key parts of the space unfolding mechanism in real time, which comprises the following steps:
a. acquiring pre-tightening force original signals of connecting pieces arranged on a plurality of gasket type force sensors by using the gasket type force sensors;
b. a multichannel data acquisition module is used for providing driving voltage for the gasket type force sensors, conditioning and acquiring the pre-tightening force original signal, and converting the pre-tightening force original signal into a readable pre-tightening force signal;
c. and carrying out data processing, displaying and storing on the pretightening force signal by using a data processing module.
According to an aspect of the present invention, in the step a, a fitting washer, a wear washer and the shim force sensor are sequentially penetratingly disposed on the coupling member before the coupling member is tightened.
According to one aspect of the invention, the pretension original signal comprises a pretension original electrical signal of the connection piece during and after tightening.
Has the advantages that:
according to the scheme of the invention, compared with a torque control method in the prior assembly process, the system and the method for measuring the pretightening force in real time can more accurately control the applied pretightening force.
By utilizing the system and the method for measuring the pretightening force in real time, the pretightening force of the bolts with multiple channels and specifications can be measured in real time, and the measured data can be displayed and stored in real time.
By utilizing the real-time measuring system and method for the pretightening force, the pretightening force loading process can be technically verified and improved, and the uniform pretightening error of each connecting bolt connected by the group of bolts is less than or equal to 5 percent by optimizing the bolt tightening process.
Drawings
FIG. 1 is a schematic diagram showing the general structure of a system for measuring the assembly pretension of key components of a space deployment mechanism in real time according to an embodiment of the invention;
FIG. 2 is a schematic diagram illustrating the installation of a shim-type sensor of a system for measuring the pre-tightening force of the key components of a space expansion mechanism in real time according to an embodiment of the invention;
FIG. 3 is a schematic diagram illustrating an operation of a system for measuring an assembly pretension of key components of a space expansion mechanism in real time according to an embodiment of the present invention;
fig. 4 schematically shows a flowchart of a method for measuring the assembling pre-tightening force of key parts of a space deployment mechanism in real time according to an embodiment of the invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
The present invention is described in detail below with reference to the drawings and the specific embodiments, which are not repeated herein, but the embodiments of the present invention are not limited to the following embodiments.
Fig. 1 schematically shows an overall structural diagram of a real-time assembly pretension force measuring system for key components of a space deployment mechanism according to the embodiment. As shown in fig. 1, the system for measuring the assembling pretightening force of the key components of the space expanding mechanism in real time in the embodiment includes: the device comprises a plurality of gasket type force sensors 3, a multi-channel data acquisition module 2 and a data processing module 1. The plurality of shim force sensors 3 are used for acquiring a pretension force raw signal of a connecting piece arranged on each shim force sensor 3. The multichannel data acquisition module 2 is used for providing driving voltage for the plurality of gasket type force sensors 3, conditioning and acquiring the pre-tightening force original signal, and converting the pre-tightening force original signal into a readable pre-tightening force electric signal. The data processing module 1 is used for processing, displaying and storing the pre-tightening force electric signals. According to the concept of the invention, the real-time monitoring of the assembling pretightening force of key parts of the space expansion mechanism, such as the connecting piece on the gasket type force sensor 3, is realized through the measurement system consisting of the plurality of gasket type force sensors 3, the multi-channel data acquisition module 2 and the data processing module 1 and the interaction and the action among the modules, so that the pretightening force is accurately controlled, and the assembling precision and the performance of the space expansion mechanism are ensured.
As shown in fig. 1, the cylindrical structure of the shim-type force sensor 3 is provided with a through hole in the middle for the connection piece to pass through. Furthermore, the cylindrical structure is an elastic body, and a plurality of strain gauges are attached to the periphery of the elastic body to form a balance bridge. The multichannel data acquisition module 2 supplies a driving voltage of the gasket type force sensor 3, and the voltage is 5V. When the pretightening force is generated in the connecting piece, the balance bridge loses balance, the gasket type force sensor 3 feeds back the generated electric signal to the multichannel data acquisition module 2, and the multichannel data acquisition module 2 has the original electric signal of the pretightening force of the connecting piece.
The elastomer of shim force sensor 3 is very stiff and a maximum force of 54kN can be measured with a shim force sensor 3 having an outer diameter of about 25 mm. The sensor has small volume, relatively concentrated strain gauge distribution and sensitivity to unbalance loading. Therefore, when the sensor is used, the sensor model that the through hole of the gasket type force sensor 3 is slightly larger than the outer diameter of the connecting piece is selected. When the through hole of the gasket type force sensor 3 is larger than the outer diameter of the connecting piece, in order to avoid unbalance loading, the through hole can be matched with a precision bushing, the bushing is arranged in the through hole, the height of the bushing is lower than that of the gasket type force sensor 3, and otherwise, the gasket type force sensor 3 cannot work normally.
Fig. 2 schematically shows an installation schematic diagram of a shim-type sensor of the system for measuring the assembly pretension of the key components of the space deployment mechanism in real time according to the embodiment. As shown in fig. 2, in order to protect the shim-type force sensor 3 from being worn during the test and ensure that the shim-type force sensor 3 is not subjected to unbalanced loading, high-hardness wear-resistant washers 5 are installed on two sides of the shim-type force sensor 3 for cooperation when the shim-type force sensor 3 is used. The same assembly washer 7 is used on the side of the wear washer 5 close to the head of the coupling piece as is actually assembled, thus ensuring that the friction of the support surfaces during the assembly of the coupling piece is not changed.
Fig. 3 schematically shows an operation schematic diagram of the real-time measuring system for the assembling pretension force of the key components of the space deployment mechanism in the embodiment. Fig. 4 schematically shows a flowchart of the method for measuring the assembling pretension force of the key components of the space deployment mechanism in real time according to the embodiment.
As shown in fig. 3 and 4, on the other hand, in the present embodiment, the real-time measuring system of the assembling pre-tightening force of the key component of the space deployment mechanism and the working principle thereof are utilized to implement the real-time measuring method of the assembling pre-tightening force of the key component of the space deployment mechanism. The method specifically comprises the following steps:
a. acquiring pretightening force original signals of connecting pieces arranged on the gasket type force sensors by using a plurality of gasket type force sensors;
b. the multichannel data acquisition module is used for providing driving voltage for the gasket type force sensors, conditioning and acquiring the pre-tightening force original signals, and converting the pre-tightening force original signals into readable pre-tightening force electric signals;
c. and the data processing module is used for processing, displaying and storing the pre-tightening force electric signal.
Preferably, the connecting member of the present embodiment is a bolt 4. The original pre-tightening force signals of all the bolts 4 in the bolt group are collected through the gasket type force sensors. As shown in fig. 2, all the assembly washers 7, the wear washers 5 and the shim force sensors 3 are inserted in this order through the shaft of the bolt 4 before the bolt 4 is tightened. The gasket type force sensor 3 has another characteristic that the self resonant frequency is higher, up to dozens of kHz, the data can be collected at higher sampling frequency, and the gasket type force sensor is suitable for being used in environments such as vibration. Therefore, the real-time measurement of the pretightening force of the bolts 4 with multiple channels and specifications can be realized, and the real-time display and storage of the measurement data are realized.
The gasket type force sensor 3 obtains pre-tightening force original signals of a plurality of bolts 4 in the tightening process and after the bolts are tightened, the signals can be collected only by conditioning, and then the signals are further converted into readable pre-tightening force electric signals, and the collected pre-tightening force electric signals are displayed and stored after data processing such as filtering. The signal conditioning and data acquisition are completed by the multi-channel data acquisition module 2, the data processing, display and storage are completed by the data processing module 1, and the working principle is shown in fig. 3.
The above description is only one embodiment of the present invention, and is not intended to limit the present invention, and it is apparent to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a real-time measurement system of key spare part assembly pretightning force of space deployment mechanism which characterized in that includes: a plurality of gasket type force sensors (3), a multi-channel data acquisition module (2) and a data processing module (1),
the gasket type force sensors (3) are used for acquiring pre-tightening force original signals of connecting pieces arranged on the gasket type force sensors (3);
the multichannel data acquisition module (2) is used for providing driving voltage for the gasket type force sensors (3), conditioning and acquiring the pre-tightening force original signal, and converting the pre-tightening force original signal into a readable pre-tightening force electric signal;
the data processing module (1) is used for processing, displaying and storing the pre-tightening force electric signal.
2. System according to claim 1, characterized in that the shim force sensor (3) is of cylindrical construction, with a through hole in the middle for the connection piece to pass through.
3. System according to claim 2, characterized in that, when the diameter of the through hole is larger than the outer diameter of the connection piece, a bushing is arranged in the through hole, the height of which bushing is lower than the height of the shim force sensor (3).
4. A system according to claim 1, wherein a plurality of strain gauges are arranged around the shim force sensor (3) to form a balanced bridge.
5. The system according to claim 4, characterized in that when a pre-load is generated in the connection piece, the balance bridge is out of balance, and the shim force sensor (3) feeds back the generated electrical signal to the multichannel data acquisition module (2).
6. System according to claim 1, characterized in that at both ends of the shim force sensor (3) a wear washer (5) is provided, respectively;
a mounting washer (7) is provided on the head side of the connecting piece.
7. System according to claim 1, characterized in that the connection is a bolt (4).
8. The method for measuring the assembling pretightening force of the key parts of the space expansion mechanism in real time by using the system for measuring the assembling pretightening force of the key parts of the space expansion mechanism in real time as claimed in claims 1 to 7 comprises the following steps:
a. acquiring pre-tightening force original signals of connecting pieces arranged on a plurality of gasket type force sensors by using the gasket type force sensors;
b. a multichannel data acquisition module is used for providing driving voltage for the gasket type force sensors, conditioning and acquiring the pre-tightening force original signal, and converting the pre-tightening force original signal into a readable pre-tightening force electric signal;
c. and the data processing module is used for carrying out data processing, displaying and storing on the pre-tightening force electric signal.
9. The method as claimed in claim 8, wherein in the step a, a fitting washer, a wear washer and the shim force sensor are sequentially disposed through the connecting member before the connecting member is tightened.
10. The method of claim 8, wherein the pretension raw signal comprises a pretension raw electrical signal of the connection during and after tightening.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111368758.7A CN114235260A (en) | 2021-11-18 | 2021-11-18 | System and method for measuring assembling pretightening force of key parts of space unfolding mechanism in real time |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111368758.7A CN114235260A (en) | 2021-11-18 | 2021-11-18 | System and method for measuring assembling pretightening force of key parts of space unfolding mechanism in real time |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103323170A (en) * | 2013-06-14 | 2013-09-25 | 内蒙古第一机械集团有限公司 | Pretightening force measuring system and method of bolt set connection |
| WO2019024174A1 (en) * | 2017-08-02 | 2019-02-07 | 大连理工大学 | Closed-loop control method for screw loosening tester capable of precisely controlling lateral load |
| CN110985023A (en) * | 2019-12-30 | 2020-04-10 | 中铁工程装备集团有限公司 | Cutter head unbalance loading detection device and detection method thereof |
| CN113567031A (en) * | 2020-12-01 | 2021-10-29 | 杭州雷恩智能制造有限公司 | Bolt pretightening force monitoring system |
-
2021
- 2021-11-18 CN CN202111368758.7A patent/CN114235260A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103323170A (en) * | 2013-06-14 | 2013-09-25 | 内蒙古第一机械集团有限公司 | Pretightening force measuring system and method of bolt set connection |
| WO2019024174A1 (en) * | 2017-08-02 | 2019-02-07 | 大连理工大学 | Closed-loop control method for screw loosening tester capable of precisely controlling lateral load |
| CN110985023A (en) * | 2019-12-30 | 2020-04-10 | 中铁工程装备集团有限公司 | Cutter head unbalance loading detection device and detection method thereof |
| CN113567031A (en) * | 2020-12-01 | 2021-10-29 | 杭州雷恩智能制造有限公司 | Bolt pretightening force monitoring system |
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