CN210719502U - Device for measuring relation between screw pre-tightening torque and pre-tightening force - Google Patents

Device for measuring relation between screw pre-tightening torque and pre-tightening force Download PDF

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Publication number
CN210719502U
CN210719502U CN201921457021.0U CN201921457021U CN210719502U CN 210719502 U CN210719502 U CN 210719502U CN 201921457021 U CN201921457021 U CN 201921457021U CN 210719502 U CN210719502 U CN 210719502U
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China
Prior art keywords
screw
force
tightening
measuring
torque
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CN201921457021.0U
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Chinese (zh)
Inventor
吴炜
陈虎林
杨娜
黄益民
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China Airborne Missile Academy
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China Airborne Missile Academy
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Priority to CN201921457021.0U priority Critical patent/CN210719502U/en
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Abstract

A device for measuring the relation between the pretightening force and the pretightening force of a screw comprises a force bearing frame, a lower screw connector, a lower screw chuck, a force sensor, an upper screw connector, an upper screw chuck, a torque wrench and a data acquisition and storage device; the torque wrench is used for applying torque to the screw head, the force sensor can measure corresponding pre-tightening force, and the pre-tightening force can be transmitted into the data acquisition and storage module in real time, so that the pre-tightening force curve relation of different connection structures is obtained; the screw is adopted for connection test, the integrity of the test screw structure is not damaged, the test tool is simple, the pre-tightening torque and the corresponding pre-tightening force can be stored in the acquisition and storage module in real time, and data analysis is facilitated.

Description

Device for measuring relation between screw pre-tightening torque and pre-tightening force
Technical Field
The invention belongs to the technical field of structural test application, and particularly relates to a device for measuring the relation between a screw pre-tightening torque and a pre-tightening force.
Background
The threaded connection is the most common connection mode of a mechanical structure, a common screw can give a reference pre-tightening torque when connecting a structural member, the reference pre-tightening torque is very practical for the threaded connection of a plurality of standard parts, however, in the actual use process of engineering, particularly in the aviation field, a plurality of non-standard parts are provided, the pre-tightening torque is determined according to the thread size, the root of the screw is twisted off under the action of the reference pre-tightening torque, or the screw is broken under the structural working environment, so that unexpected connection failure occurs.
For increasingly complex non-standard part threaded connection and a severe vibration environment of an aircraft in the flying process, the relationship between the screw pre-tightening torque and the pre-tightening force is increasingly complex, and factors influencing the relationship between the screw pre-tightening torque and the pre-tightening force are more and more.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a device for measuring the relation between the screw pre-tightening torque and the pre-tightening force, and the relation between the pre-tightening torque and the pre-tightening force of a threaded connection structure is researched through the device for measuring the relation between the screw pre-tightening torque and the pre-tightening force, so that the optimal pre-tightening torque during threaded connection is optimized, the structural connection strength is ensured, and the service life is prolonged.
In order to achieve the purpose, the invention adopts the following technical scheme:
a device for measuring the relation between the pretightening force and the pretightening force of a screw comprises a force bearing frame, a lower screw connector, a lower screw chuck, a force sensor, an upper screw connector, an upper screw chuck, a torque wrench and a data acquisition and storage device; the lower screw connector is fixed on the inner side of the beam at the lower part of the bearing frame; one end of the force sensor is connected with the upper screw connector, and the other end of the force sensor is connected with the lower screw chuck; the upper screw chuck is arranged in a round hole of an upper beam of the bearing frame; the device for measuring the relationship between the pretightening torque and the pretightening force of the screw further comprises an upper screw and a lower screw, one end of the upper screw is connected with the upper screw connector, and the other end of the upper screw is connected with the upper screw chuck in a matching way; one end of the lower screw is connected with the lower screw connector, and the other end of the lower screw is connected with the lower screw chuck in a matching way; the torque wrench is clamped at the head of the upper screw.
Preferably, the connecting holes of the upper screw connector and the lower screw connector are threaded holes and are respectively matched and connected with the screw rod parts of the upper screw and the lower screw.
Preferably, the upper screw and the lower screw are two screws with the same type and size, and the central axes of the two screws are in the same straight line.
Preferably, the device for measuring the relationship between the screw pre-tightening torque and the pre-tightening force is powered by an external power supply.
Preferably, the signal output end of the force sensor is connected with a data acquisition and storage device, and the measured pretightening force is transmitted to the data acquisition and storage device.
Preferably, the signal output end of the torque wrench is connected with a data acquisition and storage device, and the measured pre-tightening torque is transmitted to the data acquisition and storage device.
Preferably, the bearing frame is of a rectangular structure, the round hole of the upper cross beam is a smooth through hole, and the inner diameter of the hole is larger than the outer diameter of the upper screw chuck.
According to the device for measuring the relationship between the screw pre-tightening torque and the pre-tightening force, the screw is used for connection test, the structural integrity of the test screw is not damaged, a test tool is simple and easy to obtain, a test result is clear, the pre-tightening torque and the corresponding pre-tightening force can be stored in the acquisition and storage module in real time, and data analysis is facilitated.
Drawings
FIG. 1 is a schematic diagram of a device for measuring the relationship between the pre-tightening torque and the pre-tightening force of a screw according to the present invention.
In the figure: 1. a force bearing frame; 2. a lower screw connector; 3. a lower screw; 4. a lower screw clamp; 5. a force sensor; 6. an upper screw connector; 7. an upper screw; 8. an upper screw clamp; 9. a torque wrench; 10. and a data acquisition and storage device.
Detailed Description
The present invention will be explained in detail by the following examples, which are disclosed for the purpose of protecting all technical improvements within the scope of the present invention.
A device for measuring the relation between the pretightening force and the pretightening force of a screw comprises a force bearing frame 1, a lower screw connector 2, a lower screw chuck 4, a force sensor 5, an upper screw connector 6, an upper screw chuck 8, a torque wrench 9 and a data acquisition and storage device 10; the bearing frame 1 is of a rectangular structure, and the lower screw connector 2 is fixed on the inner side of a lower cross beam of the bearing frame 1; the lower screw chuck 2 is arranged at the lower side of the force sensor 5, and the upper screw connector 6 is arranged at the upper side of the force sensor 5; the upper screw chuck 8 is arranged in a round hole of an upper beam of the bearing frame 1; when a test is needed, two screws with the same type and size are adopted, the head of the lower screw 3 is arranged in the lower screw chuck 4, and the screw rod part of the lower screw 3 is arranged in the lower screw connector 2; the screw rod part of the upper screw 7 is arranged in the upper screw connector 6, and the head part of the upper screw 7 is connected with the upper screw chuck 8 in a matching way; the torque wrench 9 is clamped at the head of the upper screw 7, and the signal output end of the torque wrench is connected with the data acquisition and storage device 10.
The device for measuring the relationship between the pretightening force and the pretightening force of the screw is powered by an external power supply, the signal output end of the force sensor 5 is connected with the data acquisition and storage device 10, and the pretightening force load measured by the force sensor 5 and the applied pretightening force are stored in the data acquisition and storage device 10.
According to the device for measuring the relationship between the pre-tightening torque and the pre-tightening force of the screw, the torque is applied to the screw head through the torque wrench 9, the corresponding pre-tightening force can be measured by the force sensor 5, and both the pre-tightening torque and the pre-tightening force can be transmitted into the data acquisition and storage device 10 in real time, so that the relationship between the pre-tightening torque and the pre-tightening force curves of different connection structures is obtained.
According to the device for measuring the relationship between the pretightening force and the pretightening force of the screw, the screw is adopted for connection test, the structural integrity of the test screw is not damaged, a test tool is simple and easy to obtain, a test result is clear, the pretightening force and the corresponding pretightening force can be stored in the acquisition and storage device 10 in real time, and data analysis is facilitated.
The present invention is not described in detail in the prior art.

Claims (7)

1. A device for measuring the relation between the pretightening force and the pretightening force of a screw is characterized in that: the device comprises a bearing frame (1), a lower screw connector (2), a lower screw chuck (4), a force sensor (5), an upper screw connector (6), an upper screw chuck (8), a torque wrench (9) and a data acquisition and storage device (10); the lower screw connector (2) is fixed on the inner side of a lower cross beam of the bearing frame (1); the upper side of the force sensor (5) is connected with an upper screw connector (6), and the lower side of the force sensor is connected with a lower screw chuck (4); the upper screw chuck (8) is arranged in a round hole of an upper beam of the bearing frame (1); the device also comprises a lower screw (3) and an upper screw (7), wherein one end of the lower screw (3) is connected with the lower screw connector (2), and the other end of the lower screw (3) is connected with the lower screw chuck (4) in a matching way; one end of the upper screw (7) is connected with the upper screw connector (6), and the other end of the upper screw is connected with the upper screw chuck (8) in a matching way; the torque wrench (9) is clamped at the head of the upper screw (7).
2. The apparatus for measuring the relationship between the tightening torque and the tightening force of a screw as claimed in claim 1, wherein: and the connecting holes of the lower screw connector (2) and the upper screw connector (6) are threaded holes and are respectively matched and connected with the screw rod parts of the lower screw (3) and the upper screw (7).
3. The apparatus for measuring the relationship between the tightening torque and the tightening force of a screw as claimed in claim 1, wherein: the lower screw (3) and the upper screw (7) are two screws with the same type and size, and the central axes of the two screws are in the same straight line.
4. The apparatus for measuring the relationship between the tightening torque and the tightening force of a screw as claimed in claim 1, wherein: the device for measuring the relationship between the pretightening force and the pretightening force of the screw is powered by an external power supply.
5. The apparatus for measuring the relationship between the tightening torque and the tightening force of a screw as claimed in claim 1, wherein: and the signal output end of the force sensor (5) is connected with a data acquisition and storage device (10).
6. The apparatus for measuring the relationship between the tightening torque and the tightening force of a screw as claimed in claim 1, wherein: and the signal output end of the torque wrench (9) is connected with a data acquisition and storage device (10).
7. The apparatus for measuring the relationship between the tightening torque and the tightening force of a screw as claimed in claim 1, wherein: the bearing frame (1) is of a rectangular structure, a round hole of a cross beam at the upper part of the bearing frame is a smooth through hole, and the inner diameter of the hole is larger than the outer diameter of an upper screw chuck (8).
CN201921457021.0U 2019-09-03 2019-09-03 Device for measuring relation between screw pre-tightening torque and pre-tightening force Active CN210719502U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201921457021.0U CN210719502U (en) 2019-09-03 2019-09-03 Device for measuring relation between screw pre-tightening torque and pre-tightening force

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201921457021.0U CN210719502U (en) 2019-09-03 2019-09-03 Device for measuring relation between screw pre-tightening torque and pre-tightening force

Publications (1)

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CN210719502U true CN210719502U (en) 2020-06-09

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110657911A (en) * 2019-09-03 2020-01-07 中国空空导弹研究院 Device for measuring relation between screw pre-tightening torque and pre-tightening force

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110657911A (en) * 2019-09-03 2020-01-07 中国空空导弹研究院 Device for measuring relation between screw pre-tightening torque and pre-tightening force

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