CN208847581U - A kind of percentage of total elongation measuring device of large deformation presstressed reinforcing steel - Google Patents

Abstract

The utility model relates to electronic measuring device field, specially a kind of percentage of total elongation measuring device of large deformation presstressed reinforcing steel.A kind of percentage of total elongation measuring device of large deformation presstressed reinforcing steel, it assembles and to be formed including preceding bearing panel, rear bearing panel, lateral reinforcing prop, guide plate, stretcher, load sensor and displacement sensor, it is characterized in that: the transverse direction reinforcing prop is set between preceding bearing panel and rear bearing panel, the guide plate is passed through；The preceding bearing panel, guide plate and rear bearing panel are successively arranged in parallel；Percentage of total elongation measuring device is set between preceding bearing panel and rear bearing panel, and the percentage of total elongation measuring device includes horizontal support, left attachment base, right attachment base, movable axis, hangs and try to stop people from fighting each other, left attachment base, right attachment base.

Description

A kind of percentage of total elongation measuring device of large deformation presstressed reinforcing steel

Technical field

The utility model relates to electronic measuring device field, the percentage of total elongation of specially a kind of large deformation presstressed reinforcing steel is measured Device.

Background technique

China's prestressed concrete technology is quickly grown, cold drawn bar of the deformed bar material from early stage, cold drawn wire, The high strength low relaxed prestress steel strand largely used at present is developed to, prestress anchorage system also develops XM in succession, Large-tonnages group's anchor system such as TM, QVM, VLM, the mating gradual perfection of tensioning equipment, prestressing force new process emerge one after another, promote significantly Into the development of China's pr estressed concrete design and construction technology.Steel strand wires be widely used in building, traffic, the energy, petrochemical industry, The every field such as environmental protection are increasingly connected with daily life closely.With the increase of domestic steel strand wires production capacity, China is Through becoming cable production line big country, 2006, China's steel strand wires crude steel yield reached 5,300,000 tons, was for the first time more than that Japan leaps to generation Boundary first.In addition, China just had become the first in the world steel strand wires consumption big country more than the U.S. early in 2001.In order to ensure The quality of prestress engineering material, from 1985, China promulgated related codes and standards successively, such as the GB/T5224- of early stage 85, GB/T5224-1995 " prestressed concrete steel strand wires " etc. are primary more by regulation on machine with prepared steel wire Root is twisted into twisted wire and claims steel strand wires.Steel streakline is different according to the steel wire of preparation and purposes difference can be divided into: galvanized strand wires is answered in advance Power rod coagulates native steel strand wires, aluminum-cladding stranded wire.

Prestressed concrete steel strand wires: prestress wire be twisted by circular cross section steel wire do prestressed concrete knot The steel strand wires of the purposes such as structure, ground anchorage.Positive facilitation is played to prestressing force industry, is gone out in execution and use Existing problem, these codes and standards are also in continuous revision and improving.Currently, the experimental standard for steel strand wires material is main Referring to " prestressed concrete steel strand wires ".With the development of material processing technique, the continuous improvement of examination criteria, prestress steel twist The loading system of thread test machine；Grasping system, control system, dynamometric system need on the basis of new standard is constantly promoted constantly It improves.Computermatic variation of the metal puller system aiming at national standard and the technical requirements to testing machine and design research and development 's.(within 500mm) test smaller for deflection, it is currently used be the machine of extending (big for deflection not yet This device), the machine of extending is hung on steel strand wires, but when steel strand wires are broken, the biggish vibration generated when being broken due to steel strand wires It is dynamic, and easily lead to elastic machine (in extensometer most expensive the be exactly elastic machine) damage for the machine of extending, secondary can not use, increase at This.

And when measuring the big presstressed reinforcing steel of deflection at present, the distance of anchoring tester both ends stretching is generallyd use as pre- The deflection of stress rib, precision is smaller, and error is larger.

Summary of the invention

The purpose of the utility model is to provide a kind of percentage of total elongation measuring devices of large deformation presstressed reinforcing steel.

The utility model is achieved through the following technical solutions: a kind of percentage of total elongation measurement dress of large deformation presstressed reinforcing steel It sets, including preceding bearing panel 1, rear bearing panel 2, lateral reinforcing prop 3, guide plate 4, stretcher 5, load sensor 6 and position The components such as displacement sensor 7 assemble to be formed, wherein the transverse direction reinforcing prop 3 be set to preceding bearing panel 1 and rear bearing panel 2 it Between, pass through the guide plate 4.The preceding bearing panel 1, guide plate 4 and rear bearing panel 2 are successively arranged in parallel； Safety net 8 is installed in the side of the lateral reinforcing prop 3, top surface is equipped with shield window 9 and baffle 10；Bearing panel front end is set afterwards Oil cylinder fixator 102 is set, load sensor 6 and displacement sensor 7 are set on preceding bearing panel, can be arranged in preceding bearing panel Percentage of total elongation measuring device 101, the percentage of total elongation measurement is arranged in stretcher 5 between preceding bearing panel 1 and rear bearing panel 2 Device include horizontal support 11, left attachment base 12, right attachment base 13, movable axis 14, it is outstanding try to stop people from fighting each other 15, left attachment base 12, right connection Seat 13, between horizontal support is set, movable axis is arranged in horizontal support underhung, and movable axis is hung by the setting suspension of both ends end to end Frame, the tail end of movable axis are connected on right attachment base 13, and the front of left attachment base 12 is arranged in head end, not with left attachment base 12 It is fully connected, suspension hanger includes tail travelling bridge and head travelling bridge, and limit is arranged between tail travelling bridge and head travelling bridge Position slip pipe 16, the tail travelling bridge consistent with head travelling bridge structure is mirror settings relationship each other, and structure includes platform sling, pendulum Dynamic to hang spoon, bearing edge part, screw flexible connection, which is pulled, at the top of platform sling hangs the fixed bearing edge part of spoon screw, bearing edge part top Curved edge is arranged in portion, and downward L shape slice is arranged in two sides, and the center setting of platform sling is additionally provided with more strain gauges, more Suspention is set between strain gauge and more strain gauges or between more strain gauges and platform sling and extends silk 22, the head end Movable axis movable span is arranged in the platform sling bottom of travelling bridge, linear bearing is arranged in movable axis movable span, head end travelling bridge is suitable Movable axis utilizes linear bearing carry out activity sliding；The left attachment base 12, right attachment base 13 include that pedestal and measurement line are fixed Pipe fitting, the fixed pipe fitting of the measurement line include fixed arc pipe and switch cover.

As preferred more strain gauges, it includes signal condition amplifying circuit, D/A converting circuit, central processing Circuit, usb circuit, signal condition amplifying circuit, D/A converting circuit, central processor circuit, usb circuit, letter Number conditioning amplifying circuit is equipped with the connection signal input port with any sensing element, and signal condition amplifying circuit is responsible for collect Signal amplification, signal condition amplifying circuit connect with D/A converting circuit, and D/A converting circuit is connect with central processing circuit, The central processing unit of central processing circuit is equipped with database, and database is equipped with USB both-way communication and sensor chip recycles self-test With self diagnosis, the parameters such as automatically correct and compensate, read when powering on automatically by processor, participate in the operation of central processing unit Journey, entire circuit are powered by the extrapolation equipment of usb circuit；Voltage regulator circuit, pressure stabilizing electricity are equipped in the sensor chip Road guarantees that entire circuit voltage is steady；USB interface is connected on the equipment interface of computer, and electric current is by being this after voltage regulator circuit Product provides power supply；Sensing element uses elastic sensing element in the implementation case, and elastic sensing element is connected to signal tune On the signal input port for managing amplifying circuit, elastic sensing element is by signals such as the load of extraction, pressure through signal input port Signal condition amplifying circuit is passed to, the signal of amplification is input to D/A converting circuit by signal condition amplifying circuit, through digital-to-analogue The A/D converter of conversion circuit converts analog signals into digital signal, then is transferred to central processing circuit, and central processing unit exists Parameter when operation in automatic loading of databases calculates as a result, diagnosing, automatically correcting, compensating automatically automatically；Final result It is transmitted on digital computer or digital indicator by USB interface.

It is linked in extension spring as preferential more strain gauges, and the elastic sensing element of head end and spring are drawn It links and connects, spring pull hook is also connected with suspention and extends silk.

Simultaneously become with the voltage synchronous of more strain gauges as voltage regulator circuit is equipped in the preferably described more strain gauges Change.

As the fixed locked setting of the preferably described head travelling bridge in left 12 head end of attachment base, tail travelling bridge is in movable axis Upper sliding setting.

Include each 1 up and down as the preferably described lateral reinforcing prop, and percentage of total elongation is set between two lateral reinforcing props Measuring device.

By using preceding solution, the beneficial effects of the utility model are: inductor is that the 3 special tunnels used are visited Surveying includes inductor at two be arranged on bearing panel and at the one of direct outstanding upper setting of trying to stop people from fighting each other, in the case where permission, when Two can be so symmetrical arranged, wherein it is outstanding try to stop people from fighting each other on more strain gauges its possess USB collector using dual-cpu structure, One of them CPU aims at usb data transmission and uses, and it is the 10 of other standard serial ports that measured data transfer rate, which is 12Mbps, Times.Another CPU is integrated with 24 AD of two-way, can sample the force value data of two sensors simultaneously.Sample frequency can 5HZ~ It is adjusted within the scope of 200HZ, significant graduation is up to 300,000 or more；Encoder has 4 frequency multiplier circuit of hardware, and improving precision has response Speed.JL-2008 data acquisition controller is the upgraded product of former all card insert type collection plates.Computermatic metal pulling force The host of machine: the equipment of loading is carried out to sample；Control cabinet: it starts, stop the operation that rate of loading is adjusted dress It sets；Hydraulic power source: high pressure oil is provided to hydraulic system, by host steel strand wires are carried out with the power device of loading；Distinctive clamping Mode, the fracture position of sample is all within gauge length；Special edge of a knife support base is semi-open gate up and down, and jaw length is long, It is able to satisfy the thick diameter Method of Steel Strand Stretching mechanical property test requirement of Φ 20mm；Oil pressure sensor dynamometry；It is measured and is tried using extensometer Sample gauge length internal strain is met in new national standard to the measurement request of steel strand wires Non-proportional extension power；Photoelectric encoder measurement displacement； Hydraulic clamping sample；Using computer system, test data is acquired, amplify, show, handle and is printed.It is tried by steel strand wires Test the special edge of a knife support base insufficient rigidity of machine and testing machine fixture defect have to the measurement of steel strand wires maximum, force Fm it is important Influence, and the numerical value of Fm directly influences the calculating of anchorage efficiency coefficient.Certain detection units use full-open type form Special edge of a knife support base, special edge of a knife support base standard-sized sheet, rigidity is small, and deformation is big, causes to open outside clamping jaw, sample is beaten It is sliding；The clamping length of fixture is differed from 80mm to 180mm, and the tooth line of fixture has dotted, closely-pitched etc., these fixtures are to some extent There is " notch effect " to steel strand wires, lead to steel strand wires premature degradation, fracture always occurs in retaining part, and most cases are only There is a steel wire to be pulled off, causes end single wire fracture.Generally existing these when solving the stretching of domestic tension of steel strand machine Problem, steel strand wires in fixture not shear destruction the phenomenon that.The pulling force that steel strand wires are born is that testing machine passes through jaw and steel Frictional force is transmitted between twisted wire cover wire, and frictional force is big, and the big steel wire of contact area can also be born, due to each stock steel wire Friction power is different, and the sliding of inequality can be generated relative to jaw.And the theoretical elongation very little of steel strand wires, only quite In 1/7 or so of common carbon structural steel, therefore, the influence of the difference of slippage to the actual elongation of each stock cover wire is just Seem and more highlights.The big steel wire of actual elongation naturally will the steel wire small prior to actual elongation be pulled off.It can be seen that due to Each stock cover wire of steel strand wires pulling force that it bears different from the contact surface situation of V-type jaw is also different, and reach capacity load Moment is also different, and what the ultimate load of measured steel strand wires must be different degrees of in this way is lower than its practical ultimate load.

Special edge of a knife support base rigidity is strong, and grip size demand used in test is not high, the clamping to steel strand wires Greatly, clamping teeth generate shear stress load greatly to steel strand wires, have to sample holder position and carry out certain " safeguard measure ", substantially Degree improves the uniformity that fixture clamp steel strand wires and reliability is the key that raising testing result accuracy.

Detailed description of the invention

Fig. 1 is overall structure figure.

Fig. 2 is more strain gauge structure charts.

Fig. 3 is suspension hanger structure figure.

Fig. 4 is more strain gauge system construction drawings.

Specific embodiment

Below by embodiment, in conjunction with attached drawing, preferred specific description is used as to the technical solution of the utility model:

As shown in Figs. 1-2, a kind of percentage of total elongation measuring device of large deformation presstressed reinforcing steel, including preceding bearing panel 1, after hold The components such as section plate 2, lateral reinforcing prop 3, guide plate 4, stretcher 5, load sensor 6 and displacement sensor 7 assemble to be formed, Wherein, the lateral reinforcing prop 3 is set between preceding bearing panel 1 and rear bearing panel 2, passes through the guide plate 4.It is described Preceding bearing panel 1, guide plate 4 and rear bearing panel 2 are successively arranged in parallel；Pacify in the side of the lateral reinforcing prop 3 Equipped with safety net 8, top surface is equipped with shield window 9 and baffle 10；Oil cylinder fixator 102, preceding loading end is arranged in bearing panel front end afterwards Load sensor 6 and displacement sensor 7 are set on plate, stretcher 5 can be set in preceding bearing panel, and preceding bearing panel 1 is with after Percentage of total elongation measuring device 101 is set between bearing panel 2, and the percentage of total elongation measuring device includes horizontal support 11, Zuo Lian Joint chair 12, right attachment base 13, movable axis 14, it is outstanding try to stop people from fighting each other 15, left attachment base 12, right attachment base 13, between cross supporting frame is set, it is horizontal Movable axis is arranged in support underhung, and movable axis is connected to the right side by the setting of both ends end to end suspension hanger, the tail end of movable axis On attachment base 13, the front of left attachment base 12 is arranged in head end, is not fully connected with left attachment base 12, and suspension hanger includes tail Travelling bridge and head travelling bridge, setting limit slip pipe 16, the tail travelling bridge between tail travelling bridge and head travelling bridge Consistent with head travelling bridge structure be mirror settings relationship each other, and structure includes platform sling 17, swings and hang spoon 18, bearing edge part 19, the screw flexible connection of platform sling top, which is pulled, hangs the fixed bearing edge part of spoon screw, and curved edge is arranged at the top of bearing edge part, Two sides are arranged downward L shape slice 20, and the center setting of platform sling is additionally provided with more strain gauges 21, more strain gauges and Setting suspention extension silk 22, the head end travelling bridge are hung between more strain gauges or between more strain gauges and platform sling Movable axis movable span 23 is arranged in board bottom portion, linear bearing 24 is arranged in movable axis movable span, head end travelling bridge is along movable axis benefit Activity sliding is carried out with linear bearing；The left attachment base 12, right attachment base 13 include that pedestal and measurement line fix pipe fitting, described Measuring the fixed pipe fitting of line includes fixed arc pipe 25 and switch cover 26.It can make when 25 lower section setting match board is in split With screw rod come adjusting elasticity.

Performance introduction, this structure is maximum not to be both with what prior art scenario used, he is preceding in measurement object It after oil cylinder fixator and cable fixer on section plate and front bearing panel are fixed and then is tested, what is entirely tested Intermediate we increase the subtleer percentage of total elongation measuring device tested, he also uses the openable and closable snapping of itself Pedestal first detains main tester, recycles fixed arc pipe 25 and switch cover 26.Match board is set when split in 25 lower section Screw rod can be used and carry out adjusting elasticity, to fix tester；It recycles percentage of total elongation measuring device to carry out subtle induction simultaneously to survey Amount, method is as described below, as shown in figure 3,15 being slid over using component activity axis 14 in outstanding try to stop people from fighting each other, this sliding mainly exists Tested object carries out the sliding bring of extension test when progress in the device that is stretched, and wherein the movable axis of side can be adjusted in advance It is locked after section, is not allowed it to slide, mainly see that movement and the rectangular of pulling carry out locking rectangular selection, then utilize support Edge pieces are buckled close to tested object, are semi-open gate, and jaw length is long, are able to satisfy the thick diameter steel strand wires of Φ 20mm and are drawn Stretch mechanical property test requirement；Oil pressure sensor dynamometry；Using being deformed in extensometer measurement sample marking distance, meet in new national standard To the measurement request of steel strand wires Non-proportional extension power；Photoelectric encoder measurement displacement；Hydraulic clamping sample；Using computer system, Test data is acquired, amplify, show, handle and is printed.Not by the special edge of a knife support base rigidity of steel strand experiment machine The fixture defect of foot and testing machine has important influence to the measurement of steel strand wires maximum, force Fm, and the numerical value of Fm directly affects To the calculating of anchorage efficiency coefficient.Certain detection units use the special edge of a knife support base of full-open type form, the special edge of a knife Support base standard-sized sheet, rigidity is small, and deformation is big, causes to open outside clamping jaw, sample skids；The clamping length of fixture from 80mm to The tooth line of 180mm etc., fixture have dotted, closely-pitched etc., these fixtures have " notch effect " to steel strand wires to some extent, lead Steel strand wires premature degradation is caused, fracture always occurs in retaining part, and most cases are that only a steel wire is pulled off, and cause end Single wire fracture.

As preferred more strain gauges, it includes signal condition amplifying circuit, D/A converting circuit, central processing Circuit, usb circuit, signal condition amplifying circuit, D/A converting circuit, central processor circuit, usb circuit, letter Number conditioning amplifying circuit is equipped with the connection signal input port with any sensing element, and signal condition amplifying circuit is responsible for collect Signal amplification, signal condition amplifying circuit connect with D/A converting circuit, and D/A converting circuit is connect with central processing circuit, The central processing unit of central processing circuit is equipped with database, and database is equipped with USB both-way communication and sensor circulation self-test and certainly It the parameters such as diagnoses, automatically correct and compensates, read when powering on automatically by processor, participate in the calculating process of central processing unit, Entire circuit is powered by the extrapolation equipment of usb circuit；Voltage regulator circuit is equipped in the sensor, voltage regulator circuit guarantees whole A circuit voltage is steady；USB interface is connected on the equipment interface of computer, and electric current after voltage regulator circuit for this product by providing Power supply；Sensing element uses elastic sensing element in the implementation case, and elastic sensing element is connected to signal condition amplification electricity On the signal input port on road, the signals such as the load of extraction, pressure are passed to letter through signal input port by elastic sensing element Number conditioning amplifying circuit, the signal of amplification is input to D/A converting circuit by signal condition amplifying circuit, through D/A converting circuit A/D converter convert analog signals into digital signal, then be transferred to central processing circuit, central processing unit in operation from Parameter in dynamic loading of databases, calculates as a result, diagnosing, automatically correcting, compensating automatically automatically；Final result passes through USB Interface is transmitted on digital computer or digital indicator.

It is linked in extension spring as preferential more strain gauges, and the elastic sensing element of head end and spring are drawn It links and connects, spring pull hook is also connected with suspention and extends silk.

Simultaneously change with the voltage synchronous of sensor as voltage regulator circuit is equipped in the preferably described sensor.

As the fixed locked setting of the preferably described head travelling bridge in left 12 head end of attachment base, tail travelling bridge is in movable axis Upper sliding setting.

Include each 1 up and down as the preferably described lateral reinforcing prop, and percentage of total elongation is set between two lateral reinforcing props Measuring device.For reinforcing the supporting mechanism of main body.

The specific embodiments described herein are merely examples of the spirit of the present invention.The utility model institute Belonging to those skilled in the art can make various modifications or additions to the described embodiments or using similar Mode substitute, but without departing from the spirit of the present application or beyond the scope of the appended claims.

Claims (6)

1. a kind of percentage of total elongation measuring device of large deformation presstressed reinforcing steel, including preceding bearing panel, rear bearing panel, laterally reinforcement Column, guide plate, stretcher, load sensor and displacement sensor assemble to be formed, it is characterized in that: the transverse direction reinforcing prop setting Between preceding bearing panel and rear bearing panel, the guide plate is passed through；The preceding bearing panel, guide plate and rear carrying Panel is successively arranged in parallel；Safety net is installed in the side of the lateral reinforcing prop, top surface is equipped with shield window and baffle； Oil cylinder fixator is arranged in bearing panel front end afterwards, and load sensor and displacement sensor, preceding carrying is arranged on preceding bearing panel Stretcher can be set in panel, percentage of total elongation measuring device, the general extension are set between preceding bearing panel and rear bearing panel Rate measuring device includes horizontal support, left attachment base, right attachment base, movable axis, hangs and try to stop people from fighting each other, left attachment base, right attachment base, between Cross supporting frame is set, and movable axis is arranged in horizontal support underhung, and movable axis passes through the setting of both ends end to end suspension hanger, movable axis Tail end be connected on right attachment base, the front of left attachment base is arranged in head end, is not fully connected with left attachment base, suspension is hung Frame includes tail travelling bridge and head travelling bridge, and setting limit slip pipe, the tail move between tail travelling bridge and head travelling bridge Dynamic hanger consistent with head travelling bridge structure is mirror settings relationship each other, and structure includes platform sling, swings and hang spoon, bearing edge Part, the screw flexible connection of platform sling top, which is pulled, hangs the fixed bearing edge part of spoon screw, and curved edge is arranged at the top of bearing edge part, Two sides are arranged downward L shape slice, and the center setting of platform sling is additionally provided with more strain gauges, more strain gauges and answer more Suspention is set between force snesor or between more strain gauges and platform sling and extends silk, the platform sling bottom of the head end travelling bridge Movable axis movable span is set, linear bearing is set in movable axis movable span, head end travelling bridge utilizes linear bearing along movable axis Carry out activity sliding；The left attachment base, right attachment base include pedestal and the fixed pipe fitting of measurement line, the fixed pipe fitting of the measurement line Including fixed arc pipe and switch cover, lower section setting match board in split when screw rod can be used carry out adjusting elasticity.

2. the percentage of total elongation measuring device of a kind of large deformation presstressed reinforcing steel according to claim 1, it is characterized in that: described more Strain gauge, it includes signal condition amplifying circuit, D/A converting circuit, central processing circuit, usb circuit, signal Amplifying circuit, D/A converting circuit, central processor circuit, usb circuit are improved, signal condition amplifying circuit is equipped with and appoints The connection signal input port of what sensing element, signal condition amplifying circuit are responsible for the signal that will be collected amplification, and signal condition is put Big circuit is connect with D/A converting circuit, and D/A converting circuit is connect with central processing circuit, the centre of central processing circuit It manages device and is equipped with database, database is equipped with USB both-way communication and sensor chip circulation self-test and self diagnosis, automatically corrects and mend Parameter is repaid, is read when powering on automatically by processor, participates in the calculating process of central processing unit, entire circuit is by USB interface electricity The extrapolation equipment on road is powered；Voltage regulator circuit is equipped in the sensor chip, voltage regulator circuit guarantees that entire circuit voltage is steady； USB interface is connected on the equipment interface of computer, and electric current is by providing power supply after voltage regulator circuit for this product；Sensing element is adopted With elastic sensing element, elastic sensing element is connected on the signal input port of signal condition amplifying circuit, elasticity is sensitive The load of extraction, pressure signal are passed to signal condition amplifying circuit, signal condition amplification electricity through signal input port by element The signal of amplification is input to D/A converting circuit by road, and the A/D converter through D/A converting circuit converts analog signals into number Word signal, then it is transferred to central processing circuit, parameter of the central processing unit in operation in automatic loading of databases calculates knot Fruit diagnoses automatically, automatically corrects, compensates automatically；Final result is transmitted to digital computer by USB interface or number is shown On instrument.

3. the percentage of total elongation measuring device of a kind of large deformation presstressed reinforcing steel according to claim 1 or 2, it is characterized in that: institute It states more strain gauges to be linked in extension spring, and the elastic sensing element of head end is connected with spring pull hook, spring pull hook is also It is connected with suspention and extends silk.

4. the percentage of total elongation measuring device of a kind of large deformation presstressed reinforcing steel according to claim 1 or 2, it is characterized in that: institute It states equipped with voltage regulator circuit in more strain gauges and changes with the voltage synchronous of more strain gauges.

5. the percentage of total elongation measuring device of a kind of large deformation presstressed reinforcing steel according to claim 1, it is characterized in that: the head For the fixed locked setting of travelling bridge in left attachment base head end, tail travelling bridge slides setting on movable axis.

6. the percentage of total elongation measuring device of a kind of large deformation presstressed reinforcing steel according to claim 1, it is characterized in that: the cross Include each 1 up and down to reinforcing prop, and percentage of total elongation measuring device is set between two lateral reinforcing props.