CN203287140U - Pretightening force measuring mechanism - Google Patents
Pretightening force measuring mechanism Download PDFInfo
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- CN203287140U CN203287140U CN2013203601129U CN201320360112U CN203287140U CN 203287140 U CN203287140 U CN 203287140U CN 2013203601129 U CN2013203601129 U CN 2013203601129U CN 201320360112 U CN201320360112 U CN 201320360112U CN 203287140 U CN203287140 U CN 203287140U
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Abstract
The utility model provides a pretightning force measurement mechanism, include measuring device, drive arrangement and for the power device that drive arrangement provided power, wherein, drive arrangement includes: a drive section; a first end of the driving rod is pivotally connected with one end of the driving part; the tightening part is connected with the second end of the driving rod and is used for connecting a tested part; the measuring device is fixedly connected with the driving rod, and the pretightening force of the measured component is measured through the strain of the driving rod. According to the utility model discloses a pretightning force measurement mechanism is measuring when being surveyed the pretightning force that the part received, drives the actuating lever through the drive division and rotates to exert the pretightning force to being surveyed the part, and through the value of the measurement device of fixed connection on the actuating lever according to the strain measurement pretightning force of actuating lever. The utility model discloses a pretightning force measuring mechanism is effective, accurate and practical, can make the online dynamic determination of high strength bolt pretightning force realize.
Description
Technical field
The utility model relates to mechanical field, more specifically, relates to a kind of pretightning force measuring mechanism.
Background technology
Bolt is widely used link in mechanical field, wherein, high-strength bolt because its construction is simple, stress performance is good, endurance and the advantage that is not easy to become flexible under dynamic load be widely used in engineering machinery field, tower-body standard section as tower crane is connected with pivoting support, being connected etc. between crane rotation platform and chassis.In order to strengthen the reliability of connection, prevent from being connected to generation under operating load and become flexible, when mounted high-strength bolt has all been applied certain pretightning force.
Find according to Field Research, at present, the engineering truck installation is connected with reinforcing process and is connected with high-strength bolt ubiquity pretightning force less than normally, and even there is the phenomenon without pretension in minority.Due to the understanding of construction and installation personnel shortage to this kind connected mode, do not control in accordance with regulations pretightning force, then connecting portion draws, presses alternation repeatedly in the process of work, causes high-strength bolt and nut day by day lax.The factor of this two aspect gently makes the rigidity of equipment weaken, and is heavy can cause bolt failure, causes the accident.
In engineering reality, the fitting operation personnel do not have special-purpose instrument to control and measure the pretightning force of high-strength bolt, and what usually adopt is several empirical formula methods, such as measuring bolt elongate amount method, corner determination method and calibrated wrench method etc.But due to the restriction of means, these methods are all restrictions to some extent in the engineering application.
As depicted in figs. 1 and 2, be connected by bolt 101 between two connected pieces 102, in Fig. 1, h2 tightens the head lower end of rear bolt 101 and the distance between connected piece 102, and in Fig. 2, h2 tightens the head lower end of front bolt 101 and the distance between connected piece 102.Measure bolt elongate amount method and adopt the method for measuring bolt 101 elongations to control and measure pretightning force, be usually used in Standard Component Factory and bolt guaranteed the mensuration of load.For the bolt that is contained on plant equipment or engineering truck, owing to arranging limitation or request for utilization inconvenience measurement usually, the use occasion of surveying bolt elongate amount method is very restricted.And the bolt elongate method is also inapplicable for mounted high-strength bolt, easily bolt is produced and destroys.
As shown in Figure 3, the corner determination method is controlled the axial tension of bolt by the anglec of rotation a that measures bolt head, thereby pretightning force is controlled in allowed band.This method relies on stronger to experience, and because other factors are disturbed, easily produces erroneous judgement.In addition, because the number of plies of coupled is different, tightening degree is different, and after bolt rotated to an angle, the pulling force of bolt also was difficult to measure accurately.
As shown in Figure 4, when tightening, control the method for pretightning force of bolt 101 with the control torque size calibrated wrench method.The most of measuring spanner for force moment that adopts of the method, torque wrench and Ding Liding arm spanner are controlled pretightning force.Also have and adopt the method that test unit is combined with equipment to measure pretightning force,, such as utilizing the equipment such as strain data collecting device or axle power meter, with hydraulic torque wrench, be combined, directly measure the pretightning force of bolt on specific frock.Calibrated wrench method often needs to adopt torque spanner or data acquisition equipment, and is stronger to the dependence of equipment.And utilize these class methods to measure the value of coming on machinery or engineering truck and just put on the torque value of bolt, measured value is not directly perceived, and often not accurate enough, can not demonstrate the pretightning force present situation of high-strength bolt authentic and validly, can't reach the effect of online dynamic test.
The utility model content
The utility model purpose is to provide a kind of measurement accurate pretightning force measuring mechanism.
The utility model provides a kind of pretightning force measuring mechanism, comprises measurement mechanism, drive unit and the propulsion system of power are provided for drive unit, and wherein, drive unit comprises: drive division; Driving stem, its first end is connected with an end pivotable of drive division; Tighten section, with the second end of driving stem, be connected and be used to be connected unit under test; Wherein, measurement mechanism is fixedly connected with driving stem, and passes through the pretightning force of the strain measurement unit under test of driving stem.
Further, measurement mechanism comprises strain gauge transducer, and strain gauge transducer is fixedly installed on driving stem and arranges at intervals on driving stem.
Further, measurement mechanism comprises strain gauge transducer and sensor force rod, and strain gauge transducer is fixedly installed on the sensor force rod and arranges at intervals on the sensor force rod.
Further, driving stem comprises the first bar section and the second bar section, and the two ends of sensor force rod are connected with the second bar section with the first bar section respectively.
Further, the two ends of sensor force rod have respectively connecting portion, and connecting portion is threaded rod, and connecting portion stretches in driving stem and with driving stem, is threaded.
Further, driving stem drives the section of tightening and rotates, and the section of tightening comprises sleeve, and jacket casing is located at the upper end of unit under test.
Further, the section of tightening also comprises coupling shaft, and an end of coupling shaft is fixedly connected with sleeve, and driving stem drives and is connected by gear structure with coupling shaft.
Further, drive unit also comprises ratchet section, and ratchet section is connected with coupling shaft.
Further, drive division comprises driving cylinder and the piston rod that stretches out from an end of driving cylinder, and an end of piston rod is connected with the driving stem pivotable.
Further, drive division also comprises cylinder joint, and the one end is connected with driving cylinder, and its other end is connected with propulsion system.
Further, the pressure feeding mechanism of propulsion system for driving cylinder, being connected.
Further, the pretightning force measuring mechanism also comprises the counter-force bar, and an end of counter-force bar is connected with drive division, and its other end is connected with driving stem.
Further, the pretightning force measuring mechanism also comprises adsorption section, and adsorption section is arranged on drive unit.
According to pretightning force measuring mechanism of the present utility model, when measuring the suffered pretightning force of unit under test, drive driving stem by drive division and rotate, thereby unit under test is applied pretightning force, and by being fixedly connected on measurement mechanism on driving stem according to the value of the strain measurement pretightning force of driving stem.The utility model provides a kind of effective, accurate, practical pretightning force measuring mechanism, thereby makes the online dynamic measurement of high-strength bolt pretightning force be achieved.
Description of drawings
The accompanying drawing that forms the application's a part is used to provide further understanding of the present utility model, and illustrative examples of the present utility model and explanation thereof are used for explaining the utility model, do not form improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the existing structural representation of bolt after tightening of measuring bolt pretightening by the bolt elongate method;
Fig. 2 is the existing structural representation of bolt before tightening of measuring bolt pretightening by the bolt elongate method;
Fig. 3 is the existing structural representation of measuring the bolt of bolt pretightening by the corner method;
Fig. 4 is the existing structural representation of measuring the bolt of bolt pretightening by calibrated wrench method;
Fig. 5 is the structural representation of facing according to pretightning force measuring mechanism of the present utility model;
Fig. 6 is the plan structure schematic diagram according to pretightning force measuring mechanism of the present utility model;
Fig. 7 is the structural representation according to the drive unit of pretightning force measuring mechanism of the present utility model;
Fig. 8 is the side-looking structural representation according to the measurement mechanism of pretightning force measuring mechanism of the present utility model;
Fig. 9 is the plan structure schematic diagram according to the measurement mechanism of pretightning force measuring mechanism of the present utility model; And
Figure 10 is according to the driving stem of pretightning force measuring mechanism of the present utility model and the force diagram of measurement mechanism.
Embodiment
Describe below with reference to the accompanying drawings and in conjunction with the embodiments the utility model in detail.
As shown in Figure 5 and Figure 6, the utility model provides a kind of pretightning force measuring mechanism, comprises measurement mechanism 30, drive unit and the propulsion system 40 of power are provided for drive unit, and wherein, drive unit comprises: drive division 10; Driving stem 60, its first end is connected with an end pivotable of drive division 10; Tighten section 70, with the second end of driving stem 60, be connected and be used to be connected unit under test 101; Wherein, measurement mechanism 30 is fixedly connected with driving stem 60, and passes through the pretightning force of the strain measurement unit under test 101 of driving stem 60.
According to pretightning force measuring mechanism of the present utility model, drive division 10 comprises driving cylinder 11 and the piston rod 13 that stretches out from an end of driving cylinder 11, and an end of piston rod 13 is connected with the first end pivotable of driving stem 60, to drive driving stem 60, rotates.The second end of driving stem 60 is connected with the section of tightening 70, with unit under test 101, is connected, and drives unit under test 101 and rotates.When measuring the suffered pretightning force of unit under test 101, driving driving stem 60 by drive division 10 rotates, thereby unit under test 101 is applied pretightning force, and by being fixedly connected on measurement mechanism 30 on driving stem 60 according to the value of the strain measurement pretightning force of driving stem 60.The utility model provides a kind of effective, accurate, practical pretightning force measuring mechanism, thereby makes the online dynamic measurement of high-strength bolt pretightning force be achieved.For example in engineering truck installation and use process, can effectively to the pretightning force of high-strength bolt, carry out Numerical Control.
Wherein, the first end of driving stem 60 has bolt 20.Drive division 10 also comprises cylinder joint 12, and the one end is connected with driving cylinder 11, and its other end is connected with propulsion system 40.Cylinder joint 12 in the present embodiment is oil cylinder rapid-acting coupling, can be connected fast with propulsion system 40, for hydraulic cylinder provides power.The pressure feeding mechanism of propulsion system 40 for driving cylinder 11, being connected, propulsion system 40 in the present embodiment adopt the power source of hydraulic hand-pump as this drive unit, propulsion system 40 comprise valve piece 43, press rods 44 and fuel tank 45, wherein 43 of valve pieces at one end have tensimeter 41 and joint 42.The hydraulic hand-pump maximal pressure can reach 70MPa, can meet online detection high-strength bolt pretightning force demand.Wherein, propulsion system 40 also can adopt electric hydraulic pump, and the pretightning force that can meet like this high-strength bolt that torque value is had relatively high expectations is measured.
In addition,, because this pretightning force measuring mechanism only has and meets the requirement that drives for driving force, therefore also can adopt pneumatic type or mechanical type driving apparatus.
According to an embodiment of the present utility model, as shown in Figure 8, measurement mechanism 30 comprises strain gauge transducer 34 and sensor force rod 35, and strain gauge transducer 34 is fixedly installed on sensor force rod 35 and arranges at intervals on sensor force rod 35.In the present embodiment, unit under test 101 is high-strength bolt, is used for the connection of web member 102.
As Fig. 8, Fig. 9 and shown in Figure 10, apply driving force P by 11 pairs of driving stems 60 of driving cylinder, bolt is subject to moment T under the effect of driving force P, driving stem 60 is subject to moment M, according to equilibrium relation, the suffered torsional moment T of bolt and driving stem 60 should equate with the moment M 0 of the interactional neutral surface of bolt.Then pass through the moment curve of driving stem 60 under power P effect as shown in figure 10, get surely the equidistantly beam section of L on the strain gauge transducer 34 on driving stem 60, establishing its moment of flexure is M1, M2, has:
T=M0=2M1-M2。
Can be drawn by bolt pretightening F=2T/d:
F=52M1-M2/d。
F=5EW(2ε1-ε2)/d。
Can directly draw F=C Δ V in strain gauge transducer 34 internal circuit conversions, wherein C is the pretightning force coefficient, and Δ V is the sensor bridge output voltage.Bolt for the different size diameter, also need strain gauge transducer 34 is increased the setting button of a diameter of bolt d value, like this when driving stem 60 is rotated by the effect of driving force, the mensuration that strain gauge transducer 34 internal circuits are very fast and calculate the pretightning force value and in time by potential difference meter, export.By pretightning force measuring mechanism of the present utility model, can be not by means of laboratory equipment and frock, directly in time at the use scene or construction site determine the engineering machinery key position and connect the pretightning force situation of the high-strength bolt of use.
In the present embodiment, measurement mechanism also comprises shell 32 and the display screen 31 that is arranged on shell 32, can read at any time the size of pretightning force in bolt by display screen 31.
As shown in Figure 8 and Figure 9, driving stem 60 comprises the first bar section and the second bar section, the two ends of sensor force rod 35 are connected with the second bar section with the first bar section respectively, thereby sensor force rod 35 forms an integral body with driving stem 60, is convenient to the stress measurement to driving stem 60.
Wherein, the two ends of sensor force rod 35 have respectively connecting portion 33, and connecting portion 33 is threaded rod, and connecting portion 33 stretches in driving stem 60 and with driving stem 60, is threaded.
According to another embodiment of the present utility model, as shown in Figure 8, measurement mechanism 30 comprises strain gauge transducer 34, and strain gauge transducer 34 is fixedly installed on driving stem 60 and arranges at intervals on driving stem 60.
In the present embodiment, strain gauge transducer 34 directly sticks on the two ends of driving stem 60, and the strain stress 1 of measuring by two strain gauge transducers 34 and ε 2 measure the value of pretightning forces., in order to prevent that external environment condition from impacting measurement, at strain gauge transducer 34 outer setting protective seams, strain gauge transducer 34 is protected.
As Fig. 5 and shown in Figure 7, driving stem 60 drives the section of tightening 70 and rotates, and tightens section 70 and comprises sleeve, and jacket casing is located at the upper end of unit under test 101.Sleeve is connected with high-strength bolt to be measured, by sleeve, bolt to be measured is applied acting force P as shown in Figure 10.
Wherein, tighten section 70 and also comprise coupling shaft, an end of coupling shaft is fixedly connected with sleeve, and driving stem 60 drives and is connected by gear structure with coupling shaft.As shown in Figure 5, the inner ring of the second end of driving stem 60 is provided with inner gear structure, has the outer rotor structure on the outer ring of sleeve, and driving stem 60 drives coupling shaft by the engagement between gear and rotates, thereby the band moving sleeve rotates.
Preferably, drive unit also comprises ratchet section, and ratchet section is accurate ratchet, and with coupling shaft, by gear pair, is connected.In the process of measuring bolt pretightening, sometimes need first bolt to be measured to be applied first pretightning force, continue subsequently bolt to be measured is applied second pretightning force on the basis of this first pretightning force.For this reason, be provided with ratchet section in the present embodiment, be used for the first pretightning force is kept, be provided with a ratchet that is fixedly connected with driving stem 60 in the present embodiment, its ratchet adopts stressed uniform serration structure, after the first pretightning force has applied, ratchet and gear closely mesh, discharge driving force and can keep pretightning force value constant, and the second pretightning force continues to apply on original basis, thereby guarantee to stablize, accurate pretightning force control.To its Accuracy, the ratchet portions of drive unit is by 50 coverings of ratchet lid for fear of foreign matter.
The pretightning force measuring mechanism also comprises counter-force bar 80, and an end of counter-force bar 80 is connected with drive division 10, and its other end is connected with driving stem 60.Wherein an end of an end of counter-force bar 80 and drive division is hinged, is connected by aforesaid coupling shaft pivotable between the other end of counter-force bar 80 and sleeve.
Preferably, the pretightning force measuring mechanism also comprises adsorption section 90, and adsorption section 90 is arranged on drive unit.In the present embodiment, adsorption section 90 is absorption magnet, when this device of the on-the-spot use of engineering truck, can play fixation.
As can be seen from the above description, the utility model the above embodiments have realized following technique effect:
1, pretightning force measuring mechanism of the present utility model can directly be exported the pretightning force value of high-strength bolt, adopt super-sensitive resistance strain gage sensor and pot, measuring accuracy can be controlled within 0.5%, so pretightning force measuring mechanism of the present utility model more directly, accurately;
2, pretightning force measuring mechanism of the present utility model requires lowly to the user of service, and the external interference factor is few, and structure is light, and is small and exquisite, is fit to high-altitude (such as tower machine, panoramic table etc.) operation, and is practical.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.
Claims (13)
1. a pretightning force measuring mechanism, is characterized in that, comprises measurement mechanism (30), drive unit and the propulsion system (40) of power are provided for described drive unit, and wherein, described drive unit comprises:
Drive division (10);
Driving stem (60), its first end is connected with an end pivotable of described drive division (10);
Tighten section (70), with the second end of described driving stem (60), be connected and be used to be connected unit under test (101);
Wherein, described measurement mechanism (30) is fixedly connected with described driving stem (60), and the pretightning force by the described unit under test of the strain measurement of described driving stem 60 (101).
2. pretightning force measuring mechanism according to claim 1, it is characterized in that, described measurement mechanism (30) comprises strain gauge transducer (34), and described strain gauge transducer (34) is fixedly installed on described driving stem (60) and upward and on described driving stem (60) arranges at intervals.
3. pretightning force measuring mechanism according to claim 1, it is characterized in that, described measurement mechanism (30) comprises strain gauge transducer (34) and sensor force rod (35), and described strain gauge transducer (34) is fixedly installed on described sensor force rod (35) and upward and on described sensor force rod (35) arranges at intervals.
4. pretightning force measuring mechanism according to claim 3, is characterized in that, described driving stem (60) comprises the first bar section and the second bar section, and the two ends of described sensor force rod (35) are connected with described the second bar section with described the first bar section respectively.
5. pretightning force measuring mechanism according to claim 4, it is characterized in that, the two ends of described sensor force rod (35) have respectively connecting portion (33), described connecting portion (33) is threaded rod, and described connecting portion (33) stretches in described driving stem (60) and with described driving stem (60), is threaded.
6. pretightning force measuring mechanism according to claim 1, is characterized in that, described driving stem (60) drives the described section (70) of tightening and rotates, and the described section (70) of tightening comprises sleeve, and described jacket casing is located at the upper end of described unit under test (101).
7. pretightning force measuring mechanism according to claim 6, it is characterized in that, the described section (70) of tightening also comprises coupling shaft, and an end of described coupling shaft is fixedly connected with described sleeve, and described driving stem (60) drives and is connected by gear structure with described coupling shaft.
8. pretightning force measuring mechanism according to claim 7, is characterized in that, described drive unit also comprises ratchet section, and described ratchet section is connected with described coupling shaft.
9. pretightning force measuring mechanism according to claim 1, it is characterized in that, described drive division (10) comprises driving cylinder (11) and the piston rod (13) that stretches out from an end of described driving cylinder (11), and an end of described piston rod (13) is connected with described driving stem (60) pivotable.
10. pretightning force measuring mechanism according to claim 9, is characterized in that, described drive division (10) also comprises cylinder joint (12), and the one end is connected with described driving cylinder (11), and its other end is connected with described propulsion system (40).
11. pretightning force measuring mechanism according to claim 9, is characterized in that, the pressure feeding mechanism of described propulsion system (40) for described driving cylinder (11), being connected.
12. pretightning force measuring mechanism according to claim 1, is characterized in that, also comprises counter-force bar (80), an end of described counter-force bar (80) is connected with described drive division (10), and its other end is connected with described driving stem (60).
13. pretightning force measuring mechanism according to claim 1, is characterized in that, also comprises adsorption section (90), described adsorption section (90) are arranged on described drive unit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013203601129U CN203287140U (en) | 2013-06-21 | 2013-06-21 | Pretightening force measuring mechanism |
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| CN2013203601129U CN203287140U (en) | 2013-06-21 | 2013-06-21 | Pretightening force measuring mechanism |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104614111A (en) * | 2015-02-09 | 2015-05-13 | 中联重科股份有限公司 | Calibration device and calibration method for bolt pretightening force measurement and pretightening force control method |
| CN106050811A (en) * | 2016-08-09 | 2016-10-26 | 中国石油大学(北京) | Direct detection device of load of piston rod of oil-free reciprocation equipment |
| CN108181037A (en) * | 2017-11-20 | 2018-06-19 | 上海宏予测试仪器有限公司 | A kind of pretightening force measuring apparatus for oil connection threaded fastener |
| CN113720514A (en) * | 2021-10-27 | 2021-11-30 | 凯钲五金制品(南通)有限公司 | Ratchet spanner ratchet part stress detection equipment |
-
2013
- 2013-06-21 CN CN2013203601129U patent/CN203287140U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104614111A (en) * | 2015-02-09 | 2015-05-13 | 中联重科股份有限公司 | Calibration device and calibration method for bolt pretightening force measurement and pretightening force control method |
| CN104614111B (en) * | 2015-02-09 | 2017-09-26 | 中联重科股份有限公司 | Calibration device and calibration method for bolt pretightening force measurement and pretightening force control method |
| CN106050811A (en) * | 2016-08-09 | 2016-10-26 | 中国石油大学(北京) | Direct detection device of load of piston rod of oil-free reciprocation equipment |
| CN106050811B (en) * | 2016-08-09 | 2017-10-20 | 中国石油大学(北京) | A kind of piston rod load direct detection means of oil-free shuttling device |
| CN108181037A (en) * | 2017-11-20 | 2018-06-19 | 上海宏予测试仪器有限公司 | A kind of pretightening force measuring apparatus for oil connection threaded fastener |
| CN113720514A (en) * | 2021-10-27 | 2021-11-30 | 凯钲五金制品(南通)有限公司 | Ratchet spanner ratchet part stress detection equipment |
| CN113720514B (en) * | 2021-10-27 | 2022-02-11 | 凯钲五金制品(南通)有限公司 | Ratchet spanner ratchet part stress detection equipment |
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Granted publication date: 20131113 Termination date: 20160621 |