CN204085765U - Tools for bolts ' pretension force measuring device - Google Patents
Tools for bolts ' pretension force measuring device Download PDFInfo
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- CN204085765U CN204085765U CN201420479013.7U CN201420479013U CN204085765U CN 204085765 U CN204085765 U CN 204085765U CN 201420479013 U CN201420479013 U CN 201420479013U CN 204085765 U CN204085765 U CN 204085765U
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- packing ring
- tools
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- grooves
- measuring device
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Abstract
The utility model belongs to Aero-Space field of measuring technique, is specifically related to a kind of tools for bolts ' pretension force measuring device.This device comprises the packing ring of annular, and packing ring upper and lower end face processes an annular boss respectively; Packing ring is processed with four grooves by crook, pastes foil gauge respectively at the upper surface of packing ring four grooves and lower surface, and paste 8 altogether, R1-R4 is at upper surface, and R5-R8 is at lower surface; Four brachium pontis R1R2, R3R4, R5R6, R7R8 form full-bridge circuit.Described packing ring upper surface is different from the boss diameter of lower surface.Described packing ring uniform is processed with four grooves by crook with 90 °.The true pretightning force of the securing member that is threaded effectively can be measured by tools for bolts ' pretension force measuring device described in the utility model, and adopt the means of test specific bolt to be carried out to the demarcation of screw-down torque and pretightning force, provide the term of reference of screw-down torque when being threaded installation.
Description
Technical field
The utility model belongs to Aero-Space field of measuring technique, is specifically related to a kind of tools for bolts ' pretension force measuring device.
Background technology
In the cabin body and portion's section of Aerospace Products, screw connection structure is adopted to account for as connection securing member in large quantities, being most widely used wherein especially with bolt in portion's section interface.Producing pretightning force by applying screw-down torque to bolt, reaching the intersegmental connection in portion and fastening.Whether the intersegmental web member Prestress design in portion is reasonable, directly has influence on portion's section connection reliability, as strength of joint, rigidity and locking etc.
The Prestress design that is threaded in the past is all calculated by experimental formula, and its real load has no way of learning.This makes formal product there is certain potential safety hazard, and the too low meeting of pretightning force does not reach and connects and fastening effect, and pretightning force is too high, can damage interface.
Summary of the invention
The purpose of this utility model is to provide a kind of tools for bolts ' pretension force measuring device, effectively to measure the true pretightning force of the securing member that is threaded.
For achieving the above object, technical solution adopted in the utility model is:
A kind of tools for bolts ' pretension force measuring device, comprise the packing ring of annular, packing ring upper and lower end face processes an annular boss respectively; Packing ring is processed with four grooves by crook, pastes foil gauge respectively at the upper surface of packing ring four grooves and lower surface, and paste 8 altogether, R1-R4 is at upper surface, and R5-R8 is at lower surface; Four brachium pontis R1R2, R3R4, R5R6, R7R8 form full-bridge circuit.
Described packing ring upper surface is different from the boss diameter of lower surface.
Described packing ring uniform is processed with four grooves by crook with 90 °.
Beneficial effect acquired by the utility model is:
The true pretightning force of the securing member that is threaded effectively can be measured by tools for bolts ' pretension force measuring device described in the utility model, and adopt the means of test specific bolt to be carried out to the demarcation of screw-down torque and pretightning force, provide the term of reference of screw-down torque when being threaded installation.
Accompanying drawing explanation
Fig. 1 is packing ring sectional view;
Fig. 2 is full-bridge circuit figure;
Fig. 3 is the upper surface foil gauge scheme of installation of packing ring four grooves;
Fig. 4 is the lower surface foil gauge scheme of installation of packing ring four grooves;
Fig. 5 is screw-down torque and pretightning force graph of a relation.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in detail.
As shown in Figure 1, tools for bolts ' pretension force measuring device described in the utility model comprises ring washer, and ring washer upper and lower end face processes an annular boss respectively, and upper surface is different from the boss diameter of lower surface; When packing ring is subject to axle pressure, can produce additional bending moment between two boss, make its upper surface produce stretching strain, lower surface produces compressive strain; As shown in Figure 3, Figure 4, packing ring uniform is processed with four grooves by crook with 90 °, and paste foil gauge respectively at the upper surface of packing ring four grooves and lower surface, paste 8 altogether, R1-R4 is at upper surface, and R5-R8 is at lower surface; As shown in Figure 2, install full-bridge circuit to packing ring welding lead, four brachium pontis are respectively R1R2, R3R4, R5R6, R7R8;
When concrete enforcement, carry out according to following steps:
Step one: as shown in Figure 1, processes a ring washer, and its upper and lower end face processes an annular boss respectively, and upper surface is different from the boss diameter of lower surface.When packing ring is subject to axle pressure, can produce additional bending moment between two boss, make its upper surface produce stretching strain, lower surface produces compressive strain;
Step 2: be subject to crook with 90 ° of uniform processing, four grooves at packing ring, weaken its local stiffness, make it produce larger strain when pressurized, increases sensitivity when it is measured;
Step 3: as shown in Figure 3, Figure 4, pastes foil gauge respectively at the upper surface of packing ring four grooves and lower surface, and paste 8 altogether, R1-R4 is at upper surface, and R5-R8 is at lower surface;
Step 4: as shown in Figure 2, install full-bridge circuit to packing ring welding lead, four brachium pontis are respectively R1R2, R3R4, R5R6, R7R8, U
ifor input voltage, U
ofor output voltage, both relations are as follows:
Wherein R is foil gauge resistance value, and △ R is foil gauge resistance change amount;
Step 5: the packing ring completed is delivered to the First Astronautic Research Institute for Measurement and Test with relevant qualification and demarcates, obtains the corresponding relation that pretightning force and voltage exports and namely demarcates certificate; Obtain the corresponding relation of pretightning force and output voltage, as follows:
P＝21.29U
o
P is pretightning force, and unit is KN; U
ofor output voltage, unit is V.
Step 6: during measurement, by screw bolt passes packing ring and interface, and with nut, the wire that packing ring is drawn connects constant voltage dc source and voltage table respectively; Apply screw-down torque by torque spanner to bolt, the pretightning force produced when tighting a bolt is applied on packing ring, and voltage table reads corresponding magnitude of voltage, and contrast is demarcated certificate and obtained bolt pretightening;
Step 7: a point rank applies screw-down torque to bolt, loads 25Nm, 50Nm, 75Nm, 100Nm, 125Nm successively; The corresponding output voltage of packing ring is measured, by calculating the pretension force value that packing ring records with time stage.
Step 8: matching bolt tightening moment and packing ring record pretightning force relation, as shown in Figure 5, show that formula is as follows:
P＝0.5159M+0.3436
Note: P is bolt pretightening (KN), M is screw-down torque (Nm).
Claims (3)
1. a tools for bolts ' pretension force measuring device, is characterized in that: this device comprises the packing ring of annular, and packing ring upper and lower end face processes an annular boss respectively; Packing ring is processed with four grooves by crook, pastes foil gauge respectively at the upper surface of packing ring four grooves and lower surface, and paste 8 altogether, R1-R4 is at upper surface, and R5-R8 is at lower surface; Four brachium pontis R1R2, R3R4, R5R6, R7R8 form full-bridge circuit.
2. tools for bolts ' pretension force measuring device according to claim 1, is characterized in that: described packing ring upper surface is different from the boss diameter of lower surface.
3. tools for bolts ' pretension force measuring device according to claim 1, is characterized in that: described packing ring uniform is processed with four grooves by crook with 90 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420479013.7U CN204085765U (en) | 2014-08-22 | 2014-08-22 | Tools for bolts ' pretension force measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420479013.7U CN204085765U (en) | 2014-08-22 | 2014-08-22 | Tools for bolts ' pretension force measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204085765U true CN204085765U (en) | 2015-01-07 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420479013.7U Active CN204085765U (en) | 2014-08-22 | 2014-08-22 | Tools for bolts ' pretension force measuring device |
Country Status (1)
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| CN (1) | CN204085765U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106092423A (en) * | 2016-07-13 | 2016-11-09 | 浙江华电器材检测研究所 | A kind of fastener shaft power on-line monitoring system |
| CN106383001A (en) * | 2015-07-31 | 2017-02-08 | 上海宝钢工业技术服务有限公司 | Steam-turbine high-pressure main-throttle-valve equilibrated valve spring pretightening force measurement tool |
| CN109372882A (en) * | 2018-11-21 | 2019-02-22 | 中国航空工业集团公司北京航空精密机械研究所 | It is a kind of can be with the washer of monitoring bolt pretightning force |
| CN109489888A (en) * | 2018-12-24 | 2019-03-19 | 江苏徐工工程机械研究院有限公司 | A kind of ring structure connection tools for bolts ' pretension force detection system |
| CN109780029A (en) * | 2019-01-09 | 2019-05-21 | 烟台中天连接技术研究院 | A kind of mechanoluminescence type intelligent bolt with pretightning force instruction |
| CN110608839A (en) * | 2019-02-26 | 2019-12-24 | 蚌埠学院 | Wireless bolt pretightening force sensor |
-
2014
- 2014-08-22 CN CN201420479013.7U patent/CN204085765U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106383001A (en) * | 2015-07-31 | 2017-02-08 | 上海宝钢工业技术服务有限公司 | Steam-turbine high-pressure main-throttle-valve equilibrated valve spring pretightening force measurement tool |
| CN106092423A (en) * | 2016-07-13 | 2016-11-09 | 浙江华电器材检测研究所 | A kind of fastener shaft power on-line monitoring system |
| CN109372882A (en) * | 2018-11-21 | 2019-02-22 | 中国航空工业集团公司北京航空精密机械研究所 | It is a kind of can be with the washer of monitoring bolt pretightning force |
| CN109489888A (en) * | 2018-12-24 | 2019-03-19 | 江苏徐工工程机械研究院有限公司 | A kind of ring structure connection tools for bolts ' pretension force detection system |
| CN109489888B (en) * | 2018-12-24 | 2023-10-03 | 江苏徐工工程机械研究院有限公司 | Annular structure connecting bolt pretightening force detecting system |
| CN109780029A (en) * | 2019-01-09 | 2019-05-21 | 烟台中天连接技术研究院 | A kind of mechanoluminescence type intelligent bolt with pretightning force instruction |
| CN110608839A (en) * | 2019-02-26 | 2019-12-24 | 蚌埠学院 | Wireless bolt pretightening force sensor |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |