CN106872088B - Adapt to the ultrasonic stress detecting probe device of different curve - Google Patents

Abstract

The present invention relates to a kind of ultrasonic stress detecting probe device for adapting to different curve, including：Intermediate retainer, left side Vltrasonic device, right side Vltrasonic device, left side fixing device and right side fixing device；Intermediate retainer fixes probe apparatus on measured medium surface under magneticaction；Left side Vltrasonic device is connected between on the left of fixing device by pin, can be done fixed-axis rotation in the case where worm screw drives and be adapted to measured medium curved surface, and can launch/receive ultrasonic wave；Right side Vltrasonic device is connected between on the right side of fixing device by pin, can be driven similarly hereinafter to walk in left side Vltrasonic device gear and be done fixed-axis rotation to adapt to measured medium curved surface, can launch/receive ultrasonic wave；Left side fixing device is connected on the left of the Vltrasonic device of left side by threaded hole and square groove, and is fixed on by magnetic force on measured medium surface with making left side Vltrasonic device and is reached stable couple state；Right side fixing device is identical with the 26S Proteasome Structure and Function of left side fixing device.Present invention curved ultrasonic non-destructive control probe using the above structure and fixing device, can in the case of military service sensing equipment plane and quadric stress.

Description

Ultrasonic stress detection probe device adapted to different curved surfaces

Technical field:

The invention belongs to the field of stress detection, and in particular relates to a workpiece curved surface stress detection device. The device is small in size and light in weight, can quantitatively adjust the angle according to needs, adapt to curvatures of different sizes, and can be widely applied to curved surfaces of workpieces with different curvatures. For example: oil and gas pipelines, gas storage tanks, bridges, etc.; the magnetic adsorption force can be adjusted according to needs, and it is widely used in the field of sensor fixation in ultrasonic nondestructive testing.

Background technique:

Residual stress is an important criterion for workpiece quality evaluation, which is very harmful to workpieces in service, for example, accelerating the generation of fatigue cracks, reducing fatigue life, stress corrosion, deformation, instability, etc., so the detection of materials is of great significance . Currently the most widely used strain method and blind hole method have defects such as lossy equipment and large errors, and the device is too large to be carried and not easy to measure.

Ultrasound uses the principle of acoustoelasticity to test the residual stress. The principle of acoustoelasticity refers to the linear relationship between the propagation speed of ultrasonic waves and the stress in the workpiece. At present, the more mature ultrasonic test waveform is the critical refraction longitudinal wave, which is a special mode generated when the longitudinal wave is incident at the first critical angle, and propagates parallel to the surface of the workpiece to be tested. The distance between the transceiver probes is fixed, and the state of residual stress in the workpiece can be tested according to the change of the propagation time of the critical refracted longitudinal wave in the workpiece.

In the field of traditional stress detection, residual stress detection is usually based on planes, and the development of residual stress detection devices for curved surfaces is lacking, especially in the determination of the first critical refraction angle and device fixation.

It can be seen from the principle of acoustoelasticity that the incident angle of the ultrasonic wave must be guaranteed to be the first critical refraction angle. In plane detection, the ultrasonic transceiver probe is fixed on two opposite inclined surfaces of a plexiglass wedge, the test area is fixed, and the inclination angle relative to the surface of the workpiece to be tested is fixed. This fixed tilt angle is the first critical angle of refraction calculated based on workpiece material testing. However, there are many curved surface workpieces in the actual measurement. Since the inclined surface of the plane detection device is fixed and the device itself cannot be adjusted, it is impossible to ensure that the ultrasonic wave is incident at the first critical refraction angle when measuring the surface stress, resulting in large errors and even errors. And because the curvature of the curved surface is different, if the fixing device only adapts to one curvature, it will cause great waste and equipment redundancy. Therefore, for the surface stress detection, the device must be able to accurately adjust according to different curvatures, so that the ultrasonic wave can be accurately adjusted according to the first critical value. Refracted angle of incidence, and can be widely used.

At the same time, curved surface detection, especially in the aspect of non-horizontal curved surface detection, puts forward higher requirements for the fixing of the device. In the traditional field of ultrasonic nondestructive testing, the fixation of the sensor mainly depends on the technician holding it and pressing it on the surface of the workpiece to be tested, or attracting and fixing it with a magnet. Due to the bending characteristics of curved surface workpieces, technicians cannot ensure that the sensor is fully coupled with the surface of the measured workpiece and some curved surfaces cannot be manually fixed, and the error of the measurement results is increased due to problems such as insufficient magnet attraction due to the design, and even mistake.

In view of the above reasons, this paper proposes an ultrasonic stress detection probe device with an adjustable angle and can be effectively fixed on the curved surface of the workpiece.

Invention content:

In order to solve the shortcomings of the prior art that the ultrasonic transducer cannot be stably coupled with the surface of the equipment under test and lacks a measuring device for the curved surface of the equipment, the present invention provides a curved surface ultrasonic nondestructive testing device with high precision, The advantage of simple operation can provide constant coupling pressure, and can detect the curved surface part of the equipment in service state.

To achieve the above object, the present invention adopts the following technical solutions:

Ultrasonic stress detection probe devices adapted to different curved surfaces, including: middle fixing device, left ultrasonic device, right ultrasonic device, left fixing device and right fixing device; among them, the middle fixing device fixes the probe device under the action of magnetic force The surface of the measured medium; the left ultrasonic device is connected to the left side of the middle fixing device through a pin, and can be rotated at a fixed axis under the drive of the worm to adapt to the curved surface of the measured medium. The left ultrasonic device can transmit/receive ultrasonic waves; the right ultrasonic device passes through The pin is connected to the right side of the middle fixing device, which can be rotated synchronously with a fixed axis driven by the gear of the left ultrasonic device to adapt to the curved surface of the measured medium. The right ultrasonic device can transmit/receive ultrasonic waves; the left fixing device passes through threaded holes and square grooves Connected to the left side of the left ultrasonic device, the left fixing device securely fixes the left ultrasonic device on the surface of the measured medium through magnetic force and achieves a stable coupling state; the right fixing device has the same structure and function as the left fixing device.

Compared with the prior art, the beneficial effects of the present invention are as follows: the curved surface ultrasonic nondestructive testing probe and fixing device of the above structure can be used to measure the plane and curved surface parts of the equipment under service conditions, measure its residual stress and evaluate its safety. It can automatically adapt to the curvature of the measured surface, provide stable force, stable coupling state, simple operation, safe and reliable, low requirements for experimental site conditions, and will not cause equipment damage. Use this tool to measure the residual stress of the equipment, and use the temperature detection and correction module to measure the temperature of the measured object and perform temperature compensation, which provides an efficient and accurate method for equipment detection.

Description of drawings:

Fig. 1a is a three-dimensional schematic diagram of an ultrasonic stress detection probe device;

Figure 1b is a schematic front view of the ultrasonic stress detection probe device;

Figure 1c is a schematic cross-sectional view of an ultrasonic stress detection probe device;

Figure 1d is a schematic cross-sectional view of an ultrasonic stress detection probe device;

Fig. 2a is the three-dimensional schematic view of the plexiglass wedge on the left side;

Figure 2b is a perspective view of the left organic glass wedge;

Fig. 3 is the three-dimensional schematic view of the organic glass wedge on the right side;

Fig. 4 is the three-dimensional schematic view of central block;

Fig. 5 is a three-dimensional schematic diagram of the magnet fixing blocks on both sides and their assembly conditions;

Figure 6a is a perspective view of the whole worm;

Figure 6b is a schematic cross-sectional view of the worm as a whole;

Fig. 7a is a schematic perspective view of a worm screwed into a fixed end;

Figure 7b is a cross-sectional view of the worm screwed into the fixed end;

In the figure: 1. Left magnet fixing block, 2. Center block, 3. Left plexiglass wedge, 4. Right plexiglass wedge, 5. Upper end of worm, 6. Screw-in end, 7. Right magnet Fixed block, 8, thermal resistance, 9, boss, 10, bottom plate magnet, 11, square magnet, 12, spring leaf, 13, worm gear of left plexiglass wedge, 14, gear of right plexiglass wedge, 15, bearing, 16, the gear of left plexiglass wedge, 17, ultrasonic transducer, 18, ultrasonic transducer, 19, boss, 20, the lower end of worm.

Detailed ways:

As shown in Figure 1a and Figure 1b, the ultrasonic stress detection probe device adapted to different curved surfaces includes: a middle fixing device, a left ultrasonic device, a right ultrasonic device, a left fixing device and a right fixing device; wherein, the middle fixing device , fix the probe device on the surface of the measured medium under the action of magnetic force; the left ultrasonic device is connected to the left side of the middle fixing device through a pin, and can be rotated at a fixed axis under the drive of the worm to adapt to the curved surface of the measured medium. The left ultrasonic device can emit / Receive ultrasonic waves; the right ultrasonic device is connected to the right side of the middle fixing device through pins, and can be rotated synchronously with a fixed axis driven by the gear of the left ultrasonic device to adapt to the curved surface of the measured medium. The right ultrasonic device can transmit/receive ultrasonic waves; left The side fixing device is connected to the left side of the left ultrasonic device through threaded holes and square grooves. The left fixing device fixes the left ultrasonic device on the surface of the measured medium through magnetic force and achieves a stable coupling state; the right fixing device and the left The structure and function of the side fixing devices are the same.

As shown in Figure 1 and Figure 4, the intermediate fixing device includes: a central block 2, a bottom plate magnet 10, a worm upper end 5, and a worm lower end 20; the main body of the intermediate fixing device is the central block 2, and the top plate of the central block 2 has a circular ladder Through holes, threaded holes and blind holes are opened on the bottom plate, rectangular through holes are opened horizontally on the side, through holes and arc structures engraved with angle discs are on the left and right sides; countersunk holes are opened on the bottom plate magnet 10, through which the countersunk The screws are connected with the threaded holes on the bottom plate of the central block 2, so that the central block 2 is fixed on the surface of the measured object by magnetic force. The circular stepped through hole on the top plate of the central block 2 and the blind hole on the bottom plate are used to place and fix the worm. The worm is formed by screwing the upper end 5 of the worm and the lower end 20 of the worm, the upper end 5 of the worm is connected with a round rod under a square plate, and the lower end 20 of the worm has helical teeth and a protrusion at the bottom. The circular stepped through hole at the upper end of the central block 2 is provided with a bearing 15. The upper end 5 of the worm passes through the circular stepped hole to cooperate with the bearing 15, and the screw-in end 6 is screwed into the central block 2 to compress the bearing 15; the bottom end of the worm lower end 20 The protrusion is placed on the blind hole of the bottom plate of the central block 2, so as to avoid the vertical deviation when the worm rotates, and the worm can only rotate with a fixed axis. The side of the central block 2 has a rectangular through hole horizontally, and the left and right sides of the central block 2 have small through holes respectively, which are used to connect with the left plexiglass wedge 3 and the right plexiglass wedge 4 through pins; There are arc-shaped structures engraved with angle tables on both sides, which cooperate with the arc-shaped grooves on the left plexiglass wedge 3 and right plexiglass wedge 4 to display the rotation angles of the left and right plexiglass wedges .

As shown in Fig. 1 and Fig. 2, the ultrasonic device on the left side comprises: the worm gear 13 of the left side organic glass wedge 3, the left side organic glass wedge, the gear 16 of the left side organic glass wedge, the ultrasonic transducer 17, Boss 9, thermal resistance 8; Its main body left side plexiglass wedge 3 right ends have semicircle protruding, are respectively the worm wheel 13 of left side plexiglass wedge and the gear 16 of left side plexiglass wedge, the upper end has There is a through hole, a boss 9 at the bottom, a threaded hole and a square groove at the left end; the left plexiglass wedge 3 is provided with a 28° slope; the left plexiglass wedge 3 is connected to the center block 2 through a pin, and the left plexiglass The worm gear 13 of the wedge meshes with the lower end 20 of the worm, and when the upper end 5 of the worm rotates, it drives the left organic glass wedge 3 to rotate at a fixed axis; the gear 16 of the left organic glass wedge meshes with the gear of the right organic glass wedge ; The through hole provided at the upper end of the left organic glass wedge 3 is used to place a thermal resistor 8 to measure the temperature of the measured medium for temperature compensation; the transducer 17 is fixed at 28° of the left organic glass wedge 3 by threads On the slope, it is used to transmit/receive ultrasonic waves; the boss 9 on the left plexiglass wedge 3 is in contact with the surface of the measured object to achieve a coupling state; the threaded hole and square groove at the left end of the left plexiglass wedge 3 are used to connect with the Left side fixture connection.

As shown in Fig. 1 and Fig. 3, the ultrasonic device on the right side comprises: the gear 14 of the organic glass wedge 4 on the right side, the organic glass wedge on the right side, the ultrasonic transducer 18, the boss 19; the organic glass on the right side of its main body The semicircular protrusion at the left end of the wedge 4 is the gear 14 of the right plexiglass wedge, the bottom end has a boss 19, and the right end has a threaded hole and a square groove; the right plexiglass wedge 4 is connected to the center block 2 through a pin The gear 14 of the organic glass wedge on the right side meshes with the gear 16 of the organic glass wedge on the left side, and when the worm screw rotates, the organic glass wedge 3 on the left side and the organic glass wedge 4 on the right side will rotate synchronously, making the left side The boss 9 of the ultrasonic device and the boss 19 of the ultrasonic device on the right are in contact with the curved surface of the measured object at the same time to achieve a coupled state; at the same time, the ring scale on the screw-in end 6 can be used as an index to calculate the rotation angle of the worm The angle at which the left side organic glass wedge 3 and the right side organic glass wedge 4 rotate and the curvature of the measured surface; the transducer 18 is fixed on the 28° slope of the right side organic glass wedge 4 by threads for emission/ Receiving ultrasonic waves; the threaded hole and the square groove at the right end of the right side plexiglass wedge 4 are used to connect with the right side fixture.

As shown in Figure 1 and Figure 5, the left fixing device includes: left magnet fixing block 1, spring leaf 12, square magnet 11; the right fixing device consists of right magnet fixing block 4, spring leaf 12, square magnet 11 components; the left and right fixing devices are identical, and only the left fixing device will be described.

As shown in Figure 2 and Figure 5, there are two through holes and two protruding square plates on the left magnet fixing block 1, which are used to connect and fix with the threaded hole and the square groove at the left end of the left plexiglass wedge 3; The side magnet fixing block 1 has a T-shaped groove, which is matched with the spring sheet 12 and the square magnet 11. The spring sheet 12 and the square magnet 11 are all provided with through holes and connected by countersunk bolts; the square magnet 11 is adsorbed on the On the surface of the measured object, the force is transmitted to the spring leaf 12 through the countersunk head bolt, and the spring leaf 12 is pressed on the step of the T-shaped groove and deformed to fix the left magnet fixing block 1 on the surface of the measured object. The left side ultrasonic device is stably fixed on the surface of the measured object by the force provided by the left side magnet fixing block 1, the spring piece 12, and the square magnet 11 to the left side organic glass wedge 3, and the boss 9 is in contact with the measured object. The surface reaches a stable coupled state.

The overall working principle of the above-mentioned device is as follows: firstly, the device is placed on the surface of the measured object, and the central block 2 is fixed on the surface of the measured object by the magnetic force provided by the bottom plate magnet 10; The cooperation of the worm wheel 13 of the wedge makes the left organic glass wedge 3 rotate, and the engagement of the gear 16 of the left organic glass wedge and the gear 14 of the right organic glass wedge makes the left and right organic glass wedges 3 and 4 synchronized Rotate to adapt to the curved surface of the measured object; the force provided by the left magnet fixed block 1 and the right magnet fixed block 7 makes the device stably fixed on the curved surface of the measured object and makes the left and right plexiglass wedges 3, 4 Bosses 9 and 19 reach a stable coupling state with the surface of the measured object; read the angle at which the upper end of the worm 5 turns on the ring scale at the screw-in end 6 to obtain the curvature of the surface of the measured object; measure the measured object through the thermal resistance 8 The temperature of the medium is used for temperature compensation; the ultrasonic transducers 17 and 18 cooperate with other instruments to transmit and receive ultrasonic waves to complete the measurement of the residual stress of the measured medium.

Claims (6)

1. a kind of ultrasonic stress detecting probe device for adapting to different curve, including：Intermediate retainer, left side Vltrasonic device, Right side Vltrasonic device, left side fixing device and right side fixing device；Wherein, intermediate retainer, it is fixed under magneticaction to visit Head device is on measured medium surface；Left side Vltrasonic device is connected between on the left of fixing device by pin, can be driven in worm screw Under do fixed-axis rotation to adapt to measured medium curved surface, left side Vltrasonic device can launch/receive ultrasonic wave；Right side Vltrasonic device passes through Pin is connected between on the right side of fixing device, can left side Vltrasonic device gear drive similarly hereinafter step do fixed-axis rotation to adapt to be tested Medium curved surface, right side Vltrasonic device can launch/receive ultrasonic wave；Left side fixing device is connected to a left side by threaded hole and square groove On the left of the Vltrasonic device of side, left side fixing device makes left side Vltrasonic device be firmly secured on measured medium surface simultaneously by magnetic force Reach stable couple state；Right side fixing device is identical with the 26S Proteasome Structure and Function of left side fixing device.

2. the ultrasonic stress detecting probe device according to claim 1 for adapting to different curve, it is characterised in that centre is solid The main body for determining device is central block, and central block top plate is provided with circular shape through hole, and bottom plate is provided with threaded hole and blind hole, and side is horizontal Rectangular through-hole is provided with, each side has through hole and is carved with the arcuate structure of angle scale；Counter sink is provided with bottom plate magnet, is passed through Sunk screw is connected with the threaded hole on central block bottom plate, so that central block is fixed on testee surface by magnetic force；In The circular shape through hole of heart block top plate and the blind hole of bottom plate are used to placing and fixing worm screw；Worm screw is by worm screw upper end and worm screw lower end It is connected through a screw thread and forms, worm screw upper end is that round bar is connected under a square plate, there is helical tooth and bottom protrusion on worm screw lower end； Bearing is equipped with the circular shape through hole of central block upper end, worm screw upper end passes through circular shape hole and bearing fit, screw terminal rotation Enter central block and compress bearing；The bottom protrusion of worm screw lower end is withstood at the bottom plate blind hole of central block, so that when avoiding the worm screw from rotating The offset of the vertical direction of appearance, worm screw can only do fixed-axis rotation；The side of central block is laterally provided with rectangular through-hole, and central block is left Respectively there are small through hole in right both sides, for being connected with left side organic glass voussoir and right side organic glass voussoir by pin.

3. the ultrasonic stress detecting probe device according to claim 1 or 2 for adapting to different curve, it is characterised in that left Side Vltrasonic device, including：Left side organic glass voussoir, the worm gear of left side organic glass voussoir, the tooth of left side organic glass voussoir Wheel, ultrasonic transducer, boss, thermal resistance；Organic glass voussoir right end has semi-cylindrical hill on the left of main body, is respectively that left side is organic The worm gear of glass voussoir and the gear of left side organic glass voussoir, upper end are provided with through hole, and there is a boss in bottom, left end have threaded hole and Square groove；Left side organic glass voussoir is equipped with 28 ° of inclined-planes；Left side organic glass voussoir is connected by pin with central block, left side The worm gear of organic glass voussoir is meshed with worm screw lower end, drives left side organic glass voussoir to do dead axle when worm screw upper end rotates and turns It is dynamic；The gear of left side organic glass voussoir is meshed with the gear of right side organic glass voussoir；Left side organic glass voussoir upper end The through hole being provided with measures measured medium temperature, to temperature-compensating to place thermal resistance；Transducer is threadedly secured to a left side On 28 ° of inclined-planes of side organic glass voussoir, to launch/receive ultrasonic wave；Boss on the organic glass voussoir of left side is with being tested Body surface contacts, and reaches couple state；The threaded hole and square groove of left side organic glass voussoir left end are used to fix with left side Device connects.

4. the ultrasonic stress detecting probe device according to claim 3 for adapting to different curve, it is characterised in that right side surpasses Acoustic device, including：Gear, ultrasonic transducer, the boss of right side organic glass voussoir, right side organic glass voussoir；Its main body is right The left end semi-cylindrical hill of side organic glass voussoir is the gear of right side organic glass voussoir, and there is boss in bottom, and right end has screw thread Hole and square groove；Right side organic glass voussoir is connected by pin with central block；The gear of right side organic glass voussoir and left side The gear intermeshing of organic glass voussoir, when the worm is rotated, left side organic glass voussoir and right side organic glass voussoir will Rotate synchronously, make the boss of left side Vltrasonic device and the boss of right side Vltrasonic device while be in contact with testee curved surface, reach To couple state；A left side can be calculated by the angle of worm screw rotation using the circular scale ruler on screw terminal as index at the same time The curvature of side organic glass voussoir, the angle that right side organic glass voussoir rotates and surveyed curved surface；Transducer is threadably secured On 28 ° of inclined-planes of right side organic glass voussoir, to launch/receive ultrasonic wave；The screw thread of right side organic glass voussoir right end Hole and square groove are used to be connected with right side fixing device.

5. the ultrasonic stress detecting probe device according to claim 4 for adapting to different curve, it is characterised in that left side is solid Determine device, including：Left side magnet fixed block, spring leaf, square magnet；Right side fixing device, including：Right side magnet fixed block, Spring leaf, square magnet；Left and right sides fixing device is identical, is symmetrical arranged；There are two through holes on the magnet fixed block of left side With two protrusion square plates, fixation is connected to the threaded hole and square groove with left side organic glass voussoir left end；Left side magnet Fixed block is provided with T-slot, is engaged with spring leaf and square magnet, and spring leaf and square magnet are provided with through hole and pass through countersunk head Bolt is connected；Square magnet transmits the force to bullet since the effect of magnetic force is adsorbed on testee surface by dormant bolt Reed, spring pressure is on the ladder of T-slot and produces deformation left side magnet fixed block is fixed on testee surface；Pass through Left side magnet fixed block, spring leaf, square magnet make left side Vltrasonic device stably to the power that left side organic glass voussoir provides It is fixed on the surface of testee and boss is reached stable couple state with testee surface.

6. the ultrasonic stress detecting probe device according to claim 5 for adapting to different curve, it is characterised in that central block Each side there is the arcuate structure for being carved with angle table, with the arc on left side organic glass voussoir and right side organic glass voussoir Fit depressions, can show the rotation angle of left and right sides organic glass voussoir.