CN209706785U - Survey round frame and the roundness measuring system with it - Google Patents

Abstract

The utility model provides a kind of survey round frame and the roundness measuring system with it, and surveying round frame includes positioning pedestal, and central axis extends vertically and has multiple location holes of the opposite central axis rotational symmetry；Shaft can around the center axis thereof be installed on it, and have positioning pin；Motor is rotated for drive shaft；Linking arm is fixed on shaft；Measurement arm top is detachably secured to linking arm, is used for mounting distance sensing device；It surveys round frame to be configured to: being turned manually shaft, often turn to when keeping positioning pin opposite with default location hole, positioning pin is made to be inserted into location hole, to forbid shaft to rotate, so that distance sensing device detects the radial spacing of itself and tested circle parts surface；Or positioning pin is made to be detached from location hole, so that motor is driven measurement arm continuous rotation, distance sensing device is made continuously to detect the radial spacing of itself and tested round parts surface.The survey round frame of the utility model and with its roundness measuring system scope of application it is very wide.

Description

Survey round frame and the roundness measuring system with it

Technical field

The utility model relates to Roundness Measuring Technique fields, more particularly to a kind of survey round frame and with its roundness measurement System.

Background technique

Hydro-electric power generating equipment includes many central portions, such as the seat ring of the hydraulic turbine, the seal ring of top cover and base ring, power generation Machine stator, generator upper and lower straightening machine frame, generator unit stator, rotor, mixed-flow water turbine runner seal ring up and down, each guide bearing of unit Axle journal, big shaft flange etc..

It needs to measure circularity in processing, the installation of these central portions.But since the volume of central portion is big, type is more And installation site and height are different, each not phase of roundness measurement demand (including measurement accuracy demand and measurement method demand) Together, need to design different survey circle devices for different central portions and survey circle method, higher cost and to survey crew with Carry out big inconvenience.

Utility model content

The purpose of this utility model is to overcome the drawbacks described above of the prior art, provide a kind of wider array of survey of the scope of application Round frame and roundness measuring system with it.

The utility model further objective is that using survey round frame the higher central portion of installation site is justified Degree measurement operation.

On the one hand, the utility model provides a kind of survey round frame comprising:

Positioning pedestal, for positioning with tested round element coaxial, the central axis of positioning pedestal extends along the vertical direction And offer multiple location holes of the opposite central axis rotational symmetry；

Shaft, it is axially mounted on thereon with positioning pedestal, and can be provided with around the center axis thereof of positioning pedestal, shaft One positioning pin moving up and down；

Motor, for controllably directly or indirectly driving the shaft to rotate；

Linking arm, it is horizontally extending and be installed on the shaft top；With

Arm is measured, vertically extends and top is detachably secured to the linking arm, for mounting distance sensing Device；Round frame is surveyed to be configured to:

It is turned manually shaft, and when often turning to the angle for keeping positioning pin opposite with default location hole, makes to position Pin moves down insertion location hole, to forbid shaft to rotate, so that distance sensing device detects the diameter of itself and tested round parts surface To spacing；Or

So that positioning pin is maintained at the position for being detached from location hole, so that motor operation is driven measurement arm continuous rotation, make distance perception Survey the radial spacing that device continuously detects itself and tested round parts surface.

Optionally, round frame is surveyed further include: electric lock, after positioning pin moves up and is detached from location hole, controllably locking positioning Pin；Elastic element applies downward elastic pre-stress, to positioning pin after positioning pin is locked to unlock in electric lock Afterwards, positioning pin is promoted to move down insertion location hole.

Optionally, shaft and linking arm respectively offer the limit hole that positioning pin passes through；Elastic element is to cover on positioning pin Pressure spring, the upper end is resisted against linking arm bottom surface, and lower end is resisted against the shaft shoulder top surface of positioning pin；Axis is offered at the top of positioning pin Horizontal-extending lockhole；And electric lock is installed on linking arm comprising the lock pin that can be moved horizontally by driving makes to lock will pass through Pin insertion is detached from lockhole, completes the locking and unlocking to positioning pin.

Optionally, round frame is surveyed further include: drawstring is connected to the top of positioning pin；With at least one fixed pulley, it is installed on Linking arm, so that drawstring pulls drawstring downwards around extending downwardly after fixed pulley, to pass through in the lower section for surveying round frame to drive Positioning pin moves up.

Optionally, electric lock includes signal wire, extends to and is surveyed below round frame with the binding of institute's drawstring；Signal wire end connects It is connected to control switch component, so as to the opening and closing of user's far distance control electric lock.

Optionally, the first tooth that positioning pedestal includes the sleeve being vertically arranged and is coaxially fixable at the top of sleeve with sleeve Wheel, multiple location holes are opened in the end face of first gear；Shaft lower end is rotatably inserted sleeve；And motor is vertically arranged and consolidates Due to being equipped with second gear engaged with the first gear on linking arm, output shaft, to make second gear in motor operation Motor is driven to rotate around first gear, so that motor be made to drive linking arm rotation.

Optionally, round frame is surveyed further include: the upper end of multiple support rods, each support rod supports linking arm；Arc sliding hoop, It is connect with the lower end of each support rod, and surrounds the cylindrical outer surface with the cylindrical outer surface compartment of terrain of positioning pedestal, and Arc sliding hoop offers multiple openings, and each opening is equipped with an idler wheel, to drive support rod and arc in linking arm When sliding hoop rotation, roll idler wheel on the cylindrical outer surface of positioning pedestal.

Optionally, linking arm is fixed on the top of each support rod, and the tie point of the two is adjustable to connection arm lengths The different parts in direction；Each support rod includes that both ends open up internal thread bidirectional helical sleeve and are screwed in respectively two-way Two screw rods at screw shell both ends, will pass through the length for being adjusted to the screw-in depth for lacking a screw rod to adjust support rod, To adjust linking arm to horizontal attitude.

Optionally, round frame is surveyed further include: clump weight is respectively arranged in linking arm both ends with measurement arm.

On the other hand, the utility model additionally provides a kind of roundness measuring system comprising:

Round frame is surveyed, for the survey round frame such as any of the above item；

Distance sensing device is installed on measurement arm, is configured to rotate with measurement arm and is detected itself and tested central portion The radial spacing on surface；

Data acquisition and conditioning device, are communicated with distance sensing device with predetermined manner, to acquire, improve distance sensing dress The detection signal set forms detection data；With

Data processing equipment is communicated with predetermined manner with data acquisition and conditioning device, to receive detection data, and is utilized Pre-set programs calculate the circularities of tested central portion.

The survey round frame of the utility model and with its roundness measuring system have manual measurement mode and automatic measurement mould Formula has wide range of applications so that user selects according to different measurement demands.Manual measurement mode measuring point can be free, surveys Point is few, and speed is fast.Under automatic measurement mode, distance sensing device is motor driven to be rotated incessantly, continuous to central portion Measurement, will finally obtain the profile of whole circumference, so that roundness calculation value is more accurate, and high degree of automation, it is easy to operate. Using the survey round frame of the utility model, then without according to the design of different central portions, production, carrying and operation plurality of classes Circle device is surveyed, the cost of each link is reduced, very big convenience is equally also brought to survey crew.

Further, the survey round frame of the utility model is provided with positioning pin and along circumferentially distributed multiple fixed of positioning pedestal Position hole.Under manual measurement mode, when measuring each measuring point, positioning pin is set to be inserted into a location hole, to constrain the rotation of shaft Freedom degree rotate measurement arm can not, keep measurement result more accurate.Moreover, because angle locating for each location hole is to set in advance It has been counted that, very convenient survey crew determines angle position locating for each measuring point.

Further, the survey round frame of the utility model is convenient by structures such as electric lock, elastic element, drawstring, fixed pulleys Survey crew is in the lower section remote control positioning pin for surveying round frame.It is highly convenient for the measurement higher central portion of installation site.Water Some components are up to ten meters or more away from ground level in power generating equipment.

Further, the survey round frame of the utility model is provided with support rod and arc sliding hoop, has both realized to linking arm Support, avoid its from generating biggish deflection deformation, and do not influence the rotation of linking arm, this design is very cleverly.This Outside, the utility model also makes the tie point of support rod and linking arm adjustable, and also makes the length of support rod adjustable, is so convenient for By adjusting the length of support rod and adjusting the position of linking arm with the tie point position of linking arm, it is made to remain at water Flat posture.

According to the accompanying drawings to the detailed description of the utility model specific embodiment, those skilled in the art will be more Add the above-mentioned and other purposes, advantages and features of clear the utility model.

Detailed description of the invention

Some specific realities of the utility model are described in detail by way of example and not limitation with reference to the accompanying drawings hereinafter Apply example.Identical appended drawing reference denotes same or similar part or part in attached drawing.It should be appreciated by those skilled in the art that The drawings are not necessarily drawn to scale.In attached drawing:

Fig. 1 is the schematic block diagram of the roundness measuring system of the utility model one embodiment；

Fig. 2 is the structural schematic diagram of the survey round frame of the utility model one embodiment；

Fig. 3 is the status diagram that round frame is surveyed shown in Fig. 2 after positioning pin moves down one location hole of insertion；

Fig. 4 is enlarged drawing at the A of Fig. 3.

Specific embodiment

The utility model embodiment provides a kind of roundness measuring system, especially suitable for measuring the circularity of central portion Roundness measurement for circle shaft parts various in hydro-electric power generating equipment.

Fig. 1 is the schematic block diagram of the roundness measuring system of the utility model one embodiment.As shown in Figure 1, circularity Measuring system generally may include survey round frame 10, distance sensing device 20, data acquisition and conditioning device 30 and data at Manage device 40.

Wherein, it surveys round frame 10 and is used for mounting distance sensing device 20, and can be by manual operation or by motor 510 drivingly Distance sensing device 20 is driven to surround tested central portion rotation.

There is gap between distance sensing device 20 and the circumferential surface of tested central portion.Distance sensing device 20 is used for Its radial spacing (radial spacing of the induction end apart from circumferential surface) with the circumferential surface of tested central portion is detected, and is formed Corresponding detection signal.Radial direction refers to the radial direction of tested central portion.A kind of measurement method is, before measuring, in advance It is set at multiple measuring points of different location on one circumference of central portion.When measurement, successively distance sensing device 20 is rotated To the position opposite with each measuring point, to be detected one by one to each measuring point.Another measurement method is to fill distance sensing It sets 20 uninterruptedly to rotate, so that it continuously detects a circumference.Distance sensing device 20 can be contactless Displacement sensor, such as non-contact electric eddy shift sensor.

Data acquisition and conditioning device 30 are communicated with distance sensing device 20 with predetermined manner, to acquire, improve distance perception The detection signal generated of device 20 is surveyed, detection data is formed.Data acquisition and conditioning device 30 are acquired by Ethernet interface to be examined Signal is surveyed, inputs acquisition module after conditioning, reads and analyzes for data processing equipment 40.Data acquisition and conditioning device 30 can wrap Include sensor front end power supply module, sensor analog signals input module and data acquisition module.

Data processing equipment 40 is acquired with data and conditioning device 30 is communicated with predetermined manner, to receive data acquisition and adjust Manage the above-mentioned detection data of device 30.Data processing equipment 40 is equipped with according to designed by the Circularity error evaluation method of regulation Pre-set programs, the pre-set programs calculate the radius of multiple measuring points of tested central portion according to above-mentioned detection data, and Angle locating for each measuring point, and circularities are finally calculated accordingly, and export final result.Digital information processing device can be meter Calculation machine, the pre-set programs can be the software being installed on computer.

Circularity error evaluation have 4 kinds of main methods, including minimum area method, minimum two-multiply law, minimum circumscribed circle method with And maximum inscribed circle method etc., these belong to the standards and specifications in roundness measurement field, and details are not described herein.

Fig. 2 is the structural schematic diagram of the survey round frame 10 of the utility model one embodiment；Fig. 3 is that round frame 10 is surveyed shown in Fig. 2 Status diagram after positioning pin 310 moves down one location hole 121 of insertion；Fig. 4 is enlarged drawing at the A of Fig. 3.Referring to figure 2 to Fig. 4 describe to the structure of the survey round frame 10 of the present embodiment in detail.

As shown in Figures 2 and 3, the survey round frame 10 of the utility model embodiment generally may include positioning pedestal 100, turn Axis 200, motor 510, linking arm 400 and measurement arm 600.

For the central axis of positioning pedestal 100 along extending along the vertical direction, center axis thereof is designated as X-axis in figure.Position base Seat 100 is used for and tested central portion (when measurement its axis need to also extended vertically) coaxial positioning.Coaxial positioning herein refers to Be when surveying round frame 10 and working, the position of positioning pedestal 100 is fixed, and will not be mobile relative to tested central portion or be turned It is dynamic, but also positioning pedestal 100 and tested round element coaxial need to be made, in other words make the central axis of X-axis Yu tested central portion Line is conllinear (theory calls, when actual test are difficult to ensure without guaranteeing that 100% is conllinear).Phase is offered in positioning pedestal 100 To multiple location holes 121 of central axis (X-axis) rotational symmetry.In other words, multiple location holes 121 divide on a distribution circle The center of circle of cloth, distribution circle is fallen in X-axis.

Shaft 200 and positioning pedestal 100 are axially mounted on thereon, and can turn around the central axis (X-axis) of positioning pedestal 100 It is dynamic.Shaft 200 is provided with a positioning pin 310 moving up and down.

Motor 510 is turned about the X axis for controllably direct or indirect drive shaft 200.Linking arm 400 prolongs in the horizontal direction Stretch and be installed on the top of shaft 200.Also, make the tilt adjustable of linking arm 400, so as to when its levelness is unsatisfactory for requiring It is adjusted, is locked again after adjusting.Measurement arm 600 vertically extends, and top is detachably secured to connect Arm 400 is connect, mounting distance sensing device 20 is used for.Can make measure arm 600 multiple mounting holes are set along its length, so as to make away from There are multiple installation sites from sensing device 20.It can also make to measure 600 top of arm and the fixation position of linking arm 400 is adjustable.Tool Body, with reference to Fig. 1, the top for measuring arm 600 can be made to be connected on a clamping piece 610, clamping piece 610 is U-typed structure, with folder On linking arm 400.One fastening screw 620 is installed on clamping piece 610.The top of measurement arm 600 is adjusted to a certain connection position It postpones, tightens fastening screw, so that the end of fastening screw 620 stands tightly against 400 surface of linking arm, make the top for measuring arm 600 End is locked.

When survey crew measures product circularity using the survey round frame 10 of the present embodiment, it can be selected according to different measurement demands With one of following two measurement pattern.

(1) manual measurement mode

Survey crew presets the measuring point number and point position of central portion, is then detected one by one.Each survey Point is in same angle with a location hole 121, these location holes are known as default location hole.

Remain off motor 510, shaft 200, linking arm 400 or measurement arm 600 is manually operated in survey crew, makes It is turned about the X axis.It often turns to when making positioning pin 310 with an opposite angle of default location hole 121, makes under positioning pin 310 It moves and is inserted into the location hole 121, to forbid shaft 200 to rotate, with reference to Fig. 2.Survey crew can carry out tested central portion Spot measurement, that is, make distance sensing device 20 detect its radial direction with the measuring point of tested central portion circumferential surface between Away from.After the measurement for completing first measuring point, moves up positioning pin 310 and be detached from the location hole 121, with reference to Fig. 1.It then proceedes to operate Shaft 200 rotates, and turns to when making positioning pin 310 with second opposite angle of default location hole 121, keeps positioning pin 310 slotting Enter the location hole 121, then carries out second of spot measurement.It so repeats the operation several times, completes the measurement of multiple measuring points.

Manual measurement mode measuring point can be free, and measuring point is few, and speed is fast.The effect of positioning pin 310 and location hole 121 is about The rotational freedom of beam shaft 200 rotate measurement arm 600 can not, keep measurement result more accurate.Moreover, because each positioning Angle locating for hole 121 can be pre-designed and indicate, and survey crew very convenient in this way determines angle position locating for each measuring point. It is preferred that keeping multiple location holes 121 uniformly distributed on its distribution circle, a location hole 121 is set, and adjacent positioned hole 121 is separated by angle and is 360°/a。

(2) automatic measurement mode

So that positioning pin 310 is remained at the position of disengaging location hole 121 as shown in Figure 1, opens motor 510, make electricity The operation of machine 510 drives measurement 600 continuous rotation of arm, and distance sensing device 20 is made continuously to detect the surface of itself and tested central portion Radial spacing.The radius value of this final available whole circumference of continuous detection, can draw out a circumference profile, make circularity meter Calculation value is more accurate.And it is not necessarily to the manual operation of survey crew, the degree of automation is higher, moreover it is possible to the improper operation of manpower be avoided to lead It causes the unnecessary displacement of distance sensing device 20 and influences measurement accuracy.

Using the survey round frame of the utility model embodiment, without according to the design of different central portions, production, carrying and behaviour Make the survey circle device of plurality of classes.The cost of each link is reduced, very big convenience is equally also brought to survey crew.It is very suitable For being similar to the large industry equipment that this central portion type of water generating equipment is more, measurement demand is different.

When tested central portion is not especially high for circularity requirement, it is only necessary to carry out rough or general precision survey to circularity Manual measurement mode can be selected in amount.When needing the certain crucial measuring points of remeasurement, manual measurement mode also can be selected.

When tested central portion requires height to circularity, needs to carry out circularity more accurate measurement, automatic survey can be used Amount mode promotes the gentle roundness measurement precision of Automated water.

In some embodiments, as shown in Figures 2 to 4, surveying round frame 10 further includes electric lock 350 and elastic element 320.In After positioning pin 310 moves up disengaging location hole 121, electric lock 350 controllably locks positioning pin 310, so that its is immovable.Fixed After position pin 310 is locked by electric lock 350, elastic element 320 applies downward elastic pre-stress to positioning pin 310.In electric lock After 350 unlocks, which promotes positioning pin 310 to move down insertion location hole 121, this makes only to need survey crew to positioning pin 310 apply upward power, convenient for design force application structure.Specifically as shown in figure 4, shaft 200 and linking arm 400 respectively offer positioning The limit hole that pin 310 passes through, respectively limit hole 201 and limit hole 401.Elastic element 320 is the pressure covered on positioning pin 310 Spring, the upper end are resisted against 400 bottom surface of linking arm, and lower end is resisted against the top surface of the shaft shoulder 311 of positioning pin 310.The top of positioning pin 310 Portion offers the lockhole 315 of axis horizontal extension.Electric lock 350 is installed on linking arm 400 comprising can be moved horizontally by driving Lock pin 355 completed with will pass through the insertion of driving lock pin 355 or be detached from lockhole 315 to the locking and unlocking of positioning pin 310.Electricity Dynamic lock 350 using than wide, herein no longer repeats its specific structure in the prior art.

As shown in Figure 2 and Figure 4, surveying round frame 10 further includes drawstring 340 and at least one fixed pulley 330.Drawstring 340 is connected to The top of positioning pin 310.Fixed pulley 330 is installed on linking arm 400, and quantity can be one or more, such as setting three.It draws Rope 340 when drawstring 340 is mobile, drives fixed pulley 330 to rotate around extending downwardly after fixed pulley 330.So convenient in survey round frame 10 lower section is by pulling drawstring 340 downwards to drive positioning pin 310 to move up.In hydro-electric power generating equipment, some central portions It is higher away from ground level, up to several meters even ten meters or more.The utility model embodiment facilitates remote control by drawstring 340 Positioning pin 310 is particularly suitable for the measurement higher central portion of installation site.

In addition, also remote controlled electric lock 350.Such as shown in Fig. 2 and Fig. 4, making electric lock 350 includes signal wire 351. Signal wire 351 and rope are extended to and are surveyed under round frame 10 with bundling, its end can be made to arrive at 340 end of drawstring.The end of signal wire 351 It is connected with control switch component 352, control switch component 352 is used to control the opening and closing of electric lock 350.Certainly, one In a little alternate embodiments, the mode of settable remote controler or other wireless communications controls electric lock 350.

In some embodiments, as shown in Fig. 2, surveying round frame 10 further includes multiple support rods 710 and an arc sliding hoop 720.The upper end of each support rod 710 supports linking arm 400, and lower end is connected to arc sliding hoop 720.Positioning pedestal 100 is extremely Small part outer surface is cylindrical outer surface.The cylindrical outer surface compartment of terrain of arc sliding hoop 720 and positioning pedestal 100 surrounds The cylindrical outer surface, and arc sliding hoop 720 offers multiple openings 721, is equipped with an idler wheel at each opening 721 730.When linking arm 400 drives support rod 710 and arc sliding hoop 720 rotates, make idler wheel 730 in the circle of positioning pedestal 100 It is rolled in cylindrical outer surface.

Specifically, the top of each support rod 710 can be made to be fixed on linking arm 400, and the tie point of the two is adjustable to The different parts of 400 length direction of linking arm.As shown in Fig. 2, 710 top of support rod is connected on a clamping piece 760, clamping piece 760 be U-typed structure, to be clipped on linking arm 400.One fastening screw 740 is installed on clamping piece 760.710 top quilt of support rod After adjusting a certain link position, fastening screw 740 is tightened, so that the end of fastening screw 740 stands tightly against 400 table of linking arm Face makes 710 top of support rod be locked.Each support rod 710 includes that both ends open up internal thread bidirectional helical sleeve 711 Two screw rods 712 at 711 both ends of bidirectional helical sleeve are screwed in, respectively will pass through the rotation for being adjusted to a few screw rod 712 Enter depth to adjust the length of support rod 710.

By setting support rod 710 and arc sliding hoop 720, the support to linking arm 400 was both realized, its generation is avoided Biggish deflection deformation, and the rotation of linking arm 400 is not influenced, it designs very ingenious.In addition, making support rod 710 and linking arm 400 tie point is adjustable, and keeps the length of support rod 710 adjustable, convenient for passing through the length and and linking arm that adjust support rod 710 400 tie point position adjusts the position of linking arm 400, so that it is remained at horizontal attitude, to keep measurement more smart Really.

In some embodiments, as shown in Fig. 2, positioning pedestal 100 includes sleeve 110 and first gear 120.Sleeve 110 It is vertically arranged (its axis X-axis i.e. above-mentioned).First gear 120 is fixed on the top of sleeve 110, and coaxially sets with sleeve 110 It sets.Multiple location holes 121 above-mentioned are the end face for being opened in first gear 120.Shaft 200 can be cylindrical-shaped structure, lower end It is rotatably inserted sleeve 110, to realize being rotatably connected for the two.Motor 510 is vertically arranged (the i.e. output shaft of motor 510 It is vertical to extend) and it is fixed on linking arm 400.Second gear 520, second gear 520 and are installed on the output shaft of motor 510 The engagement of one gear 120, rotate second gear 520 around first gear 120 with motor 510 when motor 510 is run, from And make motor 510 that linking arm 400 be driven to rotate.The diameter of second gear 520 is less than the diameter of first gear 120, is subtracted with reaching The purpose of speed.Certainly, in some alternate embodiments, the output shaft of motor 510 can also be made to be directly connected in shaft 200, with Directly drive shaft 200.

In some embodiments, as shown in Fig. 2, surveying round frame 10 further includes clump weight 800.So that pivot center two sides connect The stress of arm 400 reaches balance, and linking arm 400 is made to preferably keep horizontal attitude, improving measurement accuracy.Clump weight 800 and survey Amount arm 600 is respectively arranged in the both ends of linking arm 400, and motor 510 may be provided at the ipsilateral of measurement arm 600.

The end of linking arm 400 may be provided with a thread spindle 410, can be equipped with multiple cricoid clump weights 800, as needed The quantity for determining clump weight 800 is sleeved on thread spindle 410, and then nut 810 is tightened on thread spindle 410, with locking The position of clump weight 800.

So far, although those skilled in the art will appreciate that the more of the utility model have been shown and described in detail herein A exemplary embodiment still, still can be according to the utility model public affairs in the case where not departing from the spirit and scope of the utility model The content opened directly determines or derives many other variations or modifications for meeting the utility model principle.Therefore, this is practical new The range of type is understood that and regards as to cover all such other variations or modifications.

Claims (10)

1. a kind of survey round frame, characterized by comprising:

Positioning pedestal, for positioning with tested round element coaxial, the central axis of the positioning pedestal extends along the vertical direction And offer multiple location holes of the opposite central axis rotational symmetry；

Shaft, it is axially mounted on thereon with the positioning pedestal, and can be around the center axis thereof of the positioning pedestal, described turn Axis is provided with a positioning pin moving up and down；

Motor, for controllably directly or indirectly driving the shaft to rotate；

Linking arm, it is horizontally extending and be installed on the shaft top；With

Arm is measured, vertically extends and top is detachably secured to the linking arm, for mounting distance sensing device； The survey round frame is configured to:

It is turned manually the shaft, and is often turning to the angle for keeping the positioning pin opposite with the preset location hole When, so that the positioning pin is moved down the insertion location hole, to forbid the shaft to rotate, so as to distance sensing device detection The radial spacing of itself and the surface of tested central portion；Or

So that the positioning pin is maintained at the position for being detached from the location hole, makes the motor operation that the measurement arm be driven continuously to turn It is dynamic, so that the distance sensing device is continuously detected the radial spacing of itself and the surface of tested central portion.

2. survey round frame according to claim 1, it is characterised in that further include:

Electric lock controllably locks the positioning pin after the positioning pin moves up and is detached from the location hole；

Elastic element applies downward elastic pre-stress, to the positioning pin after the positioning pin is locked so as in institute After stating electric lock unlock, the positioning pin is promoted to move down the insertion location hole.

3. survey round frame according to claim 2, which is characterized in that

The shaft and the linking arm respectively offer the limit hole that the positioning pin passes through；

The elastic element is the pressure spring covered on the positioning pin, and the upper end is resisted against the linking arm bottom surface, lower end against In the shaft shoulder top surface of the positioning pin；

The lockhole of axis horizontal extension is offered at the top of the positioning pin；And

The electric lock is installed on the linking arm comprising the lock pin that can be moved horizontally by driving makes the lock will pass through Pin insertion is detached from the lockhole, completes the locking and unlocking to the positioning pin.

4. survey round frame according to claim 2, it is characterised in that further include:

Drawstring is connected to the top of the positioning pin；With

At least one fixed pulley is installed on the linking arm, so that the drawstring extends downwardly after bypassing the fixed pulley, so as to The positioning pin is driven to move up by pulling the drawstring downwards in the lower section for surveying round frame.

5. survey round frame according to claim 4, which is characterized in that

The electric lock includes signal wire, is extended to below the survey round frame with the binding of institute's drawstring；

The signal wire end is connected with control switch component, unlatching and pass so as to electric lock described in user's far distance control It closes.

6. survey round frame according to claim 1, which is characterized in that

The positioning pedestal includes the sleeve being vertically arranged and is coaxially fixable to first at the top of the sleeve with the sleeve Gear, the multiple location hole are opened in the end face of the first gear；

The shaft lower end is rotatably inserted the sleeve；And

The motor is vertically arranged and is fixed on the linking arm, and engaged with the first gear is equipped on output shaft Two gears, in the motor operation, to make the second gear that the motor be driven to rotate around the first gear, to make The motor drives the linking arm rotation.

7. survey round frame according to claim 1, it is characterised in that further include:

The upper end of multiple support rods, each support rod supports the linking arm；

Arc sliding hoop is connect with the lower end of each support rod, and the cylindrical outer surface face interval with the positioning pedestal Ground surrounds the cylindrical outer surface, and

The arc sliding hoop offers multiple openings, and each opening is equipped with an idler wheel, in the linking arm When the support rod and the arc sliding hoop being driven to rotate, make the idler wheel on the cylindrical outer surface of the positioning pedestal It rolls.

8. survey round frame according to claim 7, which is characterized in that

The linking arm is fixed on the top of each support rod, and the tie point of the two is adjustable to the connection arm lengths The different parts in direction；

Each support rod includes that both ends open up internal thread bidirectional helical sleeve and are screwed in the two-way spiral shell respectively Two screw rods at line sleeve both ends are adjusted to the screw-in depth of a few screw rod and adjust the support rod will pass through Length, to adjusting the linking arm to horizontal attitude.

9. survey round frame according to claim 1, it is characterised in that further include:

Clump weight is respectively arranged in the linking arm both ends with the measurement arm.

10. a kind of roundness measuring system, characterized by comprising:

Round frame is surveyed, to survey round frame as claimed in any one of claims 1-9 wherein；

Distance sensing device is installed on the measurement arm, is configured to rotate with the measurement arm and is detected itself and tested circle The radial spacing of parts surface；

Data acquisition and conditioning device, are communicated with the distance sensing device with predetermined manner, to acquire, improve the distance perception The detection signal of device is surveyed, detection data is formed；With

Data processing equipment is communicated with data acquisition and conditioning device with predetermined manner, to receive the detection data, and The circularities of tested central portion are calculated using pre-set programs.