CN217425297U - Hub bolt flaw detection device - Google Patents

Abstract

The utility model provides a wheel hub bolt device of detecting a flaw belongs to the technical field that detects a flaw. The utility model provides a wheel hub bolt device of detecting a flaw, wheel hub bolt device of detecting a flaw includes: the system comprises an array butt joint tool and a plurality of ultrasonic detectors arranged on the array butt joint tool; the array butt joint tool comprises a base, a support and a locking disc; the lower end of the bracket is connected with the base, and the upper end of the bracket is connected with the locking disc; the locking disc is provided with a plurality of probe mounting holes penetrating through the front surface and the rear surface of the locking disc, and the ultrasonic detector is detachably mounted in the probe mounting holes. Utilize the utility model discloses a two easy-to-break positions on the hub bolt are detected a flaw, and then have realized detecting a flaw comprehensively to can realize that a plurality of non-dismantles the disposable comprehensive detection in batches of labour bolt, improve detection efficiency and accuracy, reduce the maintenance degree of difficulty and work load.

Description

Hub bolt flaw detection device

Technical Field

The utility model belongs to the technical field of detect a flaw, concretely relates to wheel hub bolt device of detecting a flaw especially relates to a method and device that carry out whole detection to aircraft wheel hub bolt under the state of labour.

Background

The hub bolt is a key bearing part of a wheel mechanism, such as a fixing bolt on a hub of an airplane and a transport vehicle, and has important significance for ensuring the safety and stability of the hub bolt.

Taking an airplane as an example, a landing gear hub bolt is a key bearing part of a large civil airplane, and the structure of the landing gear hub bolt is shown as a bolt part in fig. 2. The existing civil aircraft has high running frequency, the impact load born by the hub bolt is high due to frequent take-off and landing, and the fatigue fracture event of the hub bolt happens occasionally. When the vertical acceleration of the aircraft landing is too large, the landing load of the aircraft wheel is too high, the instantaneous stress of the wheel hub is large, so that two positions on the bolt of the wheel hub are easily damaged locally, the first breakable position is the position where the nut is installed on the bolt, namely the installation position of the nut 44, and the second breakable position is the transition arc position of the bolt head 41 and the bolt screw 42, namely the transition arc position of the bolt head. If the damage of the bolt is accumulated or expanded in the subsequent use process, the two easy-to-break positions are broken, and the aviation safety is seriously threatened.

The existing detection method adopts a regular inspection mode, namely, the safety of bolts at the hub of an airplane is detected according to the number of flying rises and falls or the number of flying hours and a maintenance manual. The adopted inspection method is specifically as follows:

the hub bolts are all removed and cleaned and then visually inspected, magnetically inspected or fluorescently inspected. The current inspection scheme is a line inspection work scheme specified based on airworthiness maintenance regulations. The scheme can reduce the probability of accident occurrence to the maximum extent and provide safety margin. However, during routine inspection cycles, hub bolt breakage events may still occur.

Moreover, a large number of bolts are distributed on the hub, and if the bolts are detected one by one, the maintenance cost after the navigation is necessarily greatly prolonged. But if only spot-checked, it may result in some damaged bolts being missed. At present, no relevant technology can realize the detection of the hub bolt in the service state.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to solve the difficult problem that exists among the above-mentioned prior art, provide a wheel hub bolt device of detecting a flaw, can detect a flaw to two easy-to-break positions on the wheel hub bolt simultaneously, and then realize detecting a flaw comprehensively to can realize that a plurality of non-dismantlements once only detect comprehensively in the batch of labour bolt, improve detection efficiency and accuracy, reduce the maintenance degree of difficulty and work load.

The utility model discloses a realize through following technical scheme:

the utility model provides a wheel hub bolt device of detecting a flaw, wheel hub bolt device of detecting a flaw includes: the system comprises an array butt joint tool and a plurality of ultrasonic detectors arranged on the array butt joint tool;

the array butt joint tool comprises a base, a support and a locking disc;

the lower end of the bracket is connected with the base, and the upper end of the bracket is connected with the locking disc;

the locking disc is provided with a plurality of probe mounting holes penetrating through the front surface and the rear surface of the locking disc, and the ultrasonic detector is detachably mounted in the probe mounting holes.

The utility model discloses a further improvement lies in:

the locking disc is disc-shaped, and a central through hole is formed in the center of the locking disc;

the upper part of the bracket is provided with a connecting arm, and the central axis of the connecting arm is parallel to the base;

a bearing is arranged in a central through hole of the locking disc, and the locking disc is arranged at the front end of the connecting arm through the bearing;

the plurality of probe mounting holes are uniformly distributed around the central through hole along the circumference.

The utility model discloses a further improvement lies in:

the ultrasonic detector comprises an ultrasonic probe and a probe clamp; one end of the ultrasonic probe is arranged in the probe clamp;

the outer surface of the probe clamp is provided with external threads, the inner surface of each probe mounting hole in the locking disc is provided with internal threads, and the probe clamp is connected into the probe mounting holes through threads.

The utility model discloses a further improvement lies in:

the hub bolt flaw detection device comprises a gear ring;

the gear ring is of a circular ring structure, and a plurality of teeth which are uniformly distributed along the circumference are arranged on the circular inner wall of the gear ring;

a circular ring coaxial with the locking disc is arranged on the rear side of the locking disc, a bearing is mounted on the inner wall of the circular ring, the circular outer wall of the gear ring is connected with the bearing, and the gear ring is connected to the locking disc through the bearing and can rotate relative to the gear disc;

a driven gear is arranged on the outer wall of each probe clamp;

the teeth on the driven gear on the outer wall of all the probe clamps can be meshed with the teeth on the gear ring at the same time.

The utility model discloses a further improvement lies in:

the hub bolt flaw detection device comprises a spraying part;

the shower part includes: a hydraulic source, a central pressure tube and a multi-head distributor;

one end of the central pressure pipe is connected with a hydraulic source, and the other end of the central pressure pipe is connected with a multi-head distributor;

and each outlet of the multi-head distributor is respectively connected with a hydraulic conveying pipe on the ultrasonic probe.

The utility model discloses a further improvement lies in:

the support adopts telescopic bracket.

The utility model discloses a further improvement lies in:

the bracket is movably mounted on the base.

The utility model discloses a further improvement lies in:

and universal wheels are arranged below the base.

The utility model discloses a further improvement lies in:

and a hydraulic prop, a crawler belt or a sucker is arranged below or at the edge of the base.

Compared with the prior art, the beneficial effects of the utility model are that:

utilize the utility model discloses a two easy-to-break positions on the hub bolt are detected a flaw, and then have realized detecting a flaw comprehensively to can realize that a plurality of non-dismantles the disposable comprehensive detection in batches of labour bolt, improve detection efficiency and accuracy, reduce the maintenance degree of difficulty and work load.

Drawings

FIG. 1 is a schematic view of an aircraft hub structure;

FIG. 2 is a sectional view of the ultrasonic probe of the present invention installed in cooperation with a hub bolt;

FIG. 3 is a schematic view of a hub bolt mounting arrangement;

FIG. 4 is a schematic illustration of an ultrasonic probe test installation;

fig. 5 is a schematic diagram of an array docking tool in the wheel hub bolt flaw detection device of the present invention;

fig. 6 is an assembly schematic diagram of the array docking tool in the wheel hub bolt flaw detection device of the present invention in use;

FIG. 7 is a sectional view taken along the line A-A in FIG. 6;

FIG. 8 is an enlarged partial schematic view of FIG. 7;

fig. 9 is a schematic diagram of the meshing relationship between the gear ring and the ultrasonic detector in the wheel hub bolt flaw detection device of the present invention;

FIG. 10 is an enlarged view of a portion of the ultrasound probe of FIG. 9;

fig. 11 is a schematic structural view of a shower unit in the wheel hub bolt flaw detector of the present invention.

Description of the reference numerals

1. An inboard hub; 2. a tire;

3. an outboard hub, 31, mounting holes;

4. hub bolt, 41, bolt head, 42, bolt screw, 43, bolt thread, 44, nut, 45, thread end;

5. an ultrasonic detector 51, a probe clamping device 52 and an ultrasonic probe;

6. the array butt joint tool comprises an array butt joint tool 61, a probe mounting hole 62, a base 63, a support and a 64 locking disc;

Detailed Description

The hub is a wheel core rotating part formed by connecting the inner profile steel of the tire through an upright post, namely a metal part which supports the center of the tire and is arranged on a shaft, and is widely applied to the fields of vehicles and aviation equipment. The hub is widely applied to transportation equipment such as automobiles and airplanes, serves as a key mechanism for supporting the hub on the ground, and can bear larger pressure in the process of taking off and landing of the airplane. The hub bolt is a bearing key component of the whole hub, and the detection of the use state of the hub bolt plays a crucial role in the safe operation of transportation equipment such as automobiles and airplanes, so that the crack condition of the hub bolt needs to be regularly detected.

Fig. 1 shows a schematic structural view of an aircraft hub comprising two parts, an inboard hub 1 and an outboard hub 3, between which a tyre 2 is mounted, the inboard and outboard hubs being connected together by hub bolts 4.

As shown in fig. 2, one hub bolt 4 sequentially comprises a bolt head 41, a bolt screw section 42, a bolt threaded section 43, and a threaded end 45, and a nut 44 is engaged with the bolt threaded section 43 on the hub bolt to realize fastening.

As shown in fig. 3, during assembly, after the hub bolts 4 sequentially pass through the inner hub 1 and the outer hub 3, the thread end 45 protrudes from the outer hub 3, at this time, the bolt head 41 contacts the inner hub 1, the nut 44 cooperates with the bolt thread section 43 to contact the surface of the outer hub 3 with the nut 44, the inner hub and the outer hub are tightly pressed by the bolt head 41 and the nut 44, and the bearing of the hub screw is realized by the bolt screw section 42 and the bolt thread section 43. In practical application, a plurality of hub bolts 4 are arranged around the periphery of the hub as required, and the hub bolts uniformly arranged on the circumference are used for realizing the tight assembly of the inner hub and the outer hub and meeting the bearing requirement of certain strength.

The actual ultrasonic detection position difference between the two breakable positions at which the hub bolt 4 is easily broken is large at present, the first breakable position is about 20mm from the threaded end 45, and the second breakable position is about 100mm from the threaded end 45. Therefore, the probe can realize simultaneous detection of two easy-to-break positions, and the maintenance difficulty and workload of the course can be greatly reduced.

Secondly, tens of hub bolts are arranged on the circumference of the hub of the airplane, so that even if one probe is used for detecting two dangerous positions of the same bolt, the whole hub is inspected, and the workload is very large. In order to further simplify the detection process and simultaneously realize the purpose of in-service detection. The utility model discloses still need realize once only surveying to all hub bolts on the aircraft wheel hub.

The existing detection method is that after the set number of flight hours is reached, the hub bolts are detached from the airplane, then magnetic powder or fluorescence is used for detection, and after the detection is finished, the hub bolts are installed on the airplane again, so that the working period of the prior art is long, and in the existing detection, the problems that the installation errors occur after the hub bolts are installed again, such as the installation of a gasket is reversed, and further the faults are caused, so that the hub bolts are installed and detached at certain risk. Utilize the utility model discloses can realize detecting in labour, "detecting in labour" indicates that the aircraft is in the parking area or during the overnight that falls to the ground, under the condition of not dismantling the wheel hub bolt, directly develops the detection in the wheel position, and then has avoided the dismouting of wheel hub bolt, has also avoided the mistake that the dismouting in-process appears.

For quick accurate detection, the utility model discloses utilize ultrasonic probe to carry out the detection on labour to the wheel hub bolt of installing on wheel hub to focus depth through adjustment ultrasonic probe surveys two easy-to-break positions on the wheel hub bolt.

The ultrasonic probe is installed on a hub bolt, the detection head end face of the ultrasonic probe is in contact with the thread end portion of the hub bolt, two easily-broken positions on the hub bolt are detected through the focusing depth of the ultrasonic probe, after the detection is finished, the ultrasonic probe is installed on the next hub bolt, the detection head end face of the ultrasonic probe is in contact with the thread end portion of the hub bolt, the two easily-broken positions on the hub bolt are detected through the focusing depth of the ultrasonic probe, and the like until the detection of the last hub bolt on the hub is completed.

Or, respectively installing an ultrasonic probe on each hub bolt of the hub, so that the end surface of the detection head of each ultrasonic probe is respectively contacted with the thread end of the corresponding hub bolt; and aiming at each ultrasonic probe in sequence, detecting two easy-to-break positions on the hub bolt by adjusting the focusing depth of the ultrasonic probe.

During actual operation, the utility model discloses utilize ultrasonic detector 5 to realize surveying two easy-to-break positions of wheel hub bolt 4. After a hub bolt is detected, the ultrasonic probe 52 is mounted on the next hub bolt to complete the detection of the next hub bolt, and so on until the detection of the last hub bolt is completed. In order to improve the efficiency, an ultrasonic probe 52 may be simultaneously mounted on each hub bolt, and the hub bolts may be detected by the ultrasonic probes.

As shown in fig. 2, the ultrasonic probe 5 includes an ultrasonic probe 52 and a probe clamp 51, the ultrasonic probe 52 is fixedly connected to the threaded end 45 of one hub bolt 4 through the probe clamp 51 during detection, then the position of the ultrasonic probe 52 is adjusted to make the detection head end surface of the ultrasonic probe 52 closely contact with the top end surface of the threaded end 45, a coupling agent is coated on the detection head end surface of the ultrasonic probe 52 for introducing an ultrasonic excitation signal into the hub bolt, a reflected signal of a damaged position is received by the ultrasonic probe 52, the position and the size of the damage are determined by analyzing the reflected signal collected by the ultrasonic probe 52, and the method for obtaining the damaged position and the size by analyzing the reflected signal is implemented by using the existing ultrasonic analysis method, which is not described herein again.

The probe clamp 51 can adapt to the diameter of the threaded end 45 so as to be stably clamped at the threaded end 45, and the ultrasonic probe 52 is movably mounted on the probe clamp 51, so that after the probe clamp 51 is fixed on the threaded end 45, the position of the ultrasonic probe 52 can be adjusted to enable the detection head of the ultrasonic probe 52 to be tightly attached to the top end surface of the threaded end 45.

For example, the probe holder 51 may be an elastic sleeve with two open ends, one end of the ultrasonic probe 52 is located in the elastic sleeve, the other end of the ultrasonic probe extends out from one end of the elastic sleeve, the other end of the elastic sleeve is sleeved on the threaded end 45 of the hub bolt, and the distance between the ultrasonic probe 52 and the threaded end 45 is adjusted by adjusting the length of the ultrasonic probe 52 located in the elastic sleeve.

The probe holder 51 may also be an ultrasonic probe holder disclosed in patent CN209372759U, and the mounting structure is shown in fig. 4. The section structure of a single bolt during in-service detection is shown in fig. 2, an ultrasonic probe 52 is tightly attached to the top end face of the threaded end portion 45 of the hub bolt 4 through a coupling agent, an ultrasonic signal is introduced into the hub bolt, a reflected signal of a damaged position is received by the ultrasonic probe 52, and the damaged position and size are judged through analysis of an existing ultrasonic detection instrument. The ultrasonic probe 52 generally uses a bimorph probe which is sensitive to the detection of near-field damage, but has limited judgment capability for the damage of the head position of the bolt 4, so that an appropriate bimorph focusing position must be searched to realize the simultaneous detection of two easy-to-break positions.

In order to realize the damage detection of two easy disconnected positions simultaneously, the utility model discloses a two-crystal ultrasonic probe of ultrasonic detection degree of depth for specific position, this two-crystal ultrasonic probe is current ripe product, through changing gain adjustment focus position to the realization is to the comprehensive detection of two easy disconnected positions. In actual operation, signals at specific positions are amplified by changing the range of extracting the reflected waves, and then damage characteristics at the specific positions can be identified after the signals are extracted, and changing the gain is a basic function of the existing ultrasonic detection equipment and is not described herein again.

In order to be able to detect the defects of the two easily breakable positions of the hub bolt 4 simultaneously, a suitable bimorph focus position needs to be explored to enable simultaneous detection of the two easily breakable positions. According to the structure of the hub bolt 4 and the ultrasonic detection performance, relevant parameters including the length and the diameter of the hub bolt 4 are obtained before detection is started, a focusing position is obtained according to the length and the diameter, then detection is started, the obtained return signal is sent to an existing ultrasonic detector to be analyzed, the crack generation condition of the hub bolt 4 is obtained, and detection is completed.

It can be known from many experiments that for the bolt with the length of L and the diameter of D, the focusing range of the ultrasonic probe 52 is set to L/10 to 9L/10 (in actual operation, the focusing range is realized by adjusting the included angle between the two wafers in the twin-crystal probe, and the method for adjusting the included angle is the prior art and is not described herein), and thus, two easy-to-break positions can be accurately detected at the same time. Since the two wafers emit ultrasonic waves, a focus region is formed in three-dimensional space, and signals are very strong and have high resolution in the range of the focus region, the focus range is preferably set to 1L/5-3L/5 for more accurate and targeted detection.

Specifically, taking a common airbus A320 airplane as an example, which is a single-channel double-engine medium-short range 150-class passenger plane developed and produced by European airbus company, the diameter of the hub bolt 4 is 18mm, the length of the hub bolt is 110mm, the ultrasonic probe 52 adopts a bicrystal longitudinal wave ultrasonic probe, the focusing range is determined to be 11-99mm away from the end part of the thread, and the preferred focusing range is 22-66 mm.

Adopt the utility model discloses can be in under the in service state at aircraft wheel hub, and need not dismantle the wheel hub bolt, realize detecting the crackle of wheel hub bolt, the assembly condition when detecting is shown as figure 4, can install an ultrasonic detector 5 on all wheel hub bolts 4 respectively when detecting, and then detects the wheel hub bolt 4 on the whole aircraft wheel hub.

In the detection installation, because install a plurality of wheel hub bolts 4 on wheel hub, need install ultrasonic detector 5 one in proper order to every wheel hub bolt when detecting under the labour state, for raising the efficiency and installation accuracy to guarantee that quick accurate realization detects comprehensively, the utility model provides a wheel hub bolt device of detecting a flaw.

As shown in fig. 5, the hub bolt flaw detector includes: the array butt joint device comprises an array butt joint tool 6 and a plurality of ultrasonic detectors 5 (the ultrasonic detectors 5 are not shown in fig. 5), wherein the ultrasonic detectors 5 are detachably mounted on the array butt joint tool 6, so that the array butt joint tool 6 is used for finishing butt joint detection of the ultrasonic detectors 5 and service hub bolts at one time.

Specifically, as shown in fig. 6 to 8, the array docking tool 6 includes a base 62, a bracket 63 and a locking plate 64, the lower end of the bracket 63 is connected to the base 62, and the upper end of the bracket 63 is connected to the locking plate 64. The locking plate 64 is provided with a plurality of probe mounting holes 61 penetrating through the front and rear surfaces thereof, and the ultrasonic probe 5 is detachably mounted in the probe mounting holes 61.

In order to adapt to the shape of the outer hub 3, the locking disk 64 may be a disk shape, with a central through hole in its center, with two purposes being provided, the first being to reduce the weight of the entire device, in particular the head. Secondly, space is provided for installing the support, specifically, a connecting arm is arranged on the upper portion of the support 63, the central axis of the connecting arm is parallel to the base, and the front end of the connecting arm is connected with the central through hole of the locking disc.

The probe mounting holes 61 are uniformly distributed around the central through hole along the circumference, and the distribution positions of the probe mounting holes 61 correspond to the distribution positions of the hub bolts 4 on the outer hub 3.

When the in-service hub bolts 4 need to be subjected to flaw detection, a plurality of ultrasonic detectors 5 can be installed in the probe installation holes 61, the ultrasonic detectors correspond to the probe installation holes one by one, then the position of the locking disc 64 relative to the outer hub 3 is adjusted by adjusting the position of the array butt joint tool 6, so that the locking disc 64 enters the inner ring of the outer hub 3, and meanwhile, each hub bolt is inserted into the probe clamp 51 of the corresponding ultrasonic detector 5, thus each ultrasonic detector 5 can be quickly and accurately butted with the hub bolt 3, and then the installation of the plurality of ultrasonic detectors 5 is completed at one time,

then, by adjusting the position of the ultrasonic probe 52 in the probe holder 51 so that the end surface of the detection head of the ultrasonic probe 52 comes into contact with the tip end surface of the threaded end portion 45 of the hub bolt 4, ultrasonic flaw detection can be started.

Further, in order to realize the detachable installation of the ultrasonic detector 5, the outer surface of the probe clamp 51 is provided with an external thread, and correspondingly, the inner surface of each probe installation hole 61 is provided with an internal thread, so that the ultrasonic detector 5 can be rapidly and detachably installed on the locking disc through the matching of the internal thread and the external thread. The threaded connection is relatively stable and accurate, and can be detachably mounted in other modes, such as pneumatic pushing, hydraulic pushing and the like, as long as accurate positioning can be realized.

Specifically, the inside of the probe clamp 51 and the outside surface of the ultrasonic probe 52 can be in sliding fit, that is, the ultrasonic probe 52 can move within the probe clamp 51 to a limited extent, so that the detection head end surface of the ultrasonic probe 52 is in contact with the top end surface of the threaded end 45 (in an ultrasonic detection mode, the detection head of the probe is required to be in contact with a detected object, and then ultrasonic waves can be input into a detected workpiece. For example, the ultrasonic probe 52 and the probe holder 51 may be moved by screw-fitting, that is, a male screw is provided on an outer surface of the ultrasonic probe 52, a female screw is provided on an inner surface of the probe holder 51, and the ultrasonic probe 52 and the probe holder 51 are screwed to adjust relative positions.

In addition, considering that the device detects the in-service hub bolts 4, and the in-service hub is installed on a vehicle or an airplane in a use state, the distribution positions of the hub bolts 4 in the circumferential direction can be changed due to different rotation angles of the hub during each detection, in order to cope with the situation, the locking disc 64 is rotatably installed on the bracket 63, specifically, the installation can be realized by matching a bearing with a locking mechanism, namely, the bearing is installed in a central through hole of the locking disc, the locking disc 64 is connected on a connecting arm through the bearing, the locking disc 64 is fixed by using the locking mechanism after the circumferential angle is adjusted, or an electric mode can be adopted, the locking disc 64 is installed on an output shaft of a rotating motor, and the locking disc is driven by the motor to rotate to adjust the position.

The locking disc 64 is used to ensure the probe is in close contact with the bolt, because if the probe is connected in a virtual way or the contact is not close to the bolt, the ultrasonic signal is attenuated or the reflected signal of the defect position cannot be received. The mode that ensures probe and screw thread head 45 in close contact with has a lot, for example, can use hydraulic pressure or pneumatic mode, promotes the probe and removes to the bolt head, also can the rear side of locking dish sets up the ring gear, and the ring gear sets up with the locking dish coaxial line, and the ring gear is connected with the locking dish through outside bearing, and the ring gear can be rotatory relatively the locking dish through the bearing like this.

Specifically, as shown in fig. 9 and 10, the gear ring is a circular ring structure, and a plurality of teeth are uniformly distributed along the circumference on the inner circular wall of the gear ring. In order to install the gear ring, a ring (not shown in fig. 5 to 8) coaxial with the locking disc is arranged on the rear side of the locking disc, the ring and the locking disc can be integrally formed and can also be welded into a whole with the locking disc, a bearing is installed on the inner wall of the ring, the circular outer wall of the gear ring is connected with the bearing, namely the outer ring of the bearing is connected with the inner wall of the ring on the locking disc, the inner ring of the bearing is connected with the circular outer wall of the gear ring, and therefore the gear ring is connected to the locking disc through the bearing and can rotate relative to the gear disc.

Be provided with driven gear on every probe anchor clamps 51's outer wall, this driven gear can adopt the structure of similar nut, fixed connection can on probe anchor clamps 51's outer wall, the tooth on the driven gear on all probe anchor clamps 51 outer walls can be with the tooth meshing on the ring gear simultaneously, and like this, through the cooperation of tooth and driven gear on the ring gear (being the driving gear), just can drive all probe anchor clamps 51's rotation through rotating the ring gear, and then promote all probe anchor clamps 51 and ultrasonic transducer 52 and carry out the back-and-forth movement, realize the inseparable laminating or the separation of the top terminal surface of the screw thread tip of ultrasonic transducer 52 and bolt.

Specifically, the gear ring can be driven by a motor through a manual drive or an external gear. The gear ring drives the probe clamp 51 to rotate when rotating, and particularly, the gear ring can drive the probe clamp 51 to rotate clockwise when rotating clockwise, the ultrasonic probe 52 moves forwards, namely, moves towards the end part of the screw thread, so that the end surface of the detection head of the ultrasonic probe 52 is close to the top end of the end part of the screw thread, the gear ring is fixed or locked after being jacked, and the probe can be tightly attached to the head part of the screw bolt. When the gear ring rotates counterclockwise, the probe clamp 51 can be driven to rotate counterclockwise, and the ultrasonic probe 52 moves backward to be separated from the end of the thread. For simplicity and clarity, only the teeth on the gear ring and probe holder that engage each other are shown in FIGS. 9 and 10, and the teeth in other positions are not shown.

Further, it is possible to spray water or other coupling agent to the ultrasonic probe 52 and the screw end portion by automatically spraying water (water is an ultrasonic coupling agent) or spraying the coupling agent, thereby providing close contact between the ultrasonic probe 52 and the screw end portion and exhausting air at a gap between the ultrasonic probe 52 and the screw end portion.

The water or couplant can be sprayed in two ways, the first being to spray the water or couplant on the threaded end of the hub bolt and the ultrasonic probe 52 before testing. Alternatively, the coupling agent or water is supplied to the position where each ultrasonic probe 52 and the bolt are in contact by a shower member, thereby further enhancing the contact therebetween.

Specifically, as shown in fig. 11, the shower part includes a central pressure pipe 1101, a hydraulic pressure source and a multi-head distributor 1102, one end of the central pressure pipe 1101 is connected with a hydraulic pressure source (the hydraulic pressure source can be arranged on the base or at other suitable positions), the other end is connected with a multi-head distributor 1102 (the multi-head distributor can be arranged at the rear part of the connecting arm or at other suitable positions), each outlet of the multi-head distributor 1102 is respectively connected with a hydraulic pressure conveying pipe on the probe (the hydraulic pressure conveying pipe is the existing configuration on the ultrasonic probe and is not described in detail here), thus, the liquid in the hydraulic pressure source is conveyed to the rear part of each ultrasonic probe through the central pressure pipe 1101, the multi-head distributor 1102 and the hydraulic conveying pipe, and the liquid enters the joint position of the ultrasonic probe and the bolt under the action of pressure, so that the coupling contact of the ultrasonic probe and the end part of the thread is realized. The hydraulic source, the central pressure pipe, the multi-head distributor and the hydraulic conveying pipe are all conventional products and are not described in detail herein.

In some embodiments, due to the tire pressure or the weight of the aircraft, the support 63 may be designed as a telescopic support, which can be adjusted in the height direction, for example, a hydraulic or pneumatic support can be used, which can be lifted to a certain extent, and then the height of the probe mounting hole can be adjusted, so as to achieve the basic alignment of the probe and the hub bolt.

Further, the support 63 may also be movably mounted on the base 62, for example, by a conventional mounting method in the field of sliding grooves, guide rails, etc., so as to realize the transverse and longitudinal movements of the support 63 in the horizontal plane. Through the arrangement, the three-dimensional position of the locking disc 63 in the space can be freely and flexibly adjusted, so that the locking disc is flexibly butted with the hub, and the alignment of the ultrasonic detector 5 and the hub bolt 4 is realized.

Furthermore, the below of base is provided with the universal wheel that is used for removing, in addition, the below of base or edge are provided with hydraulic prop, track or sucking disc, and the during operation removes the base to the wheel hub position, realizes adjusting the back well basically, packs up the universal wheel, fixes subaerial through modes such as hydraulic prop, track, sucking disc. When the probe is pressed against the root of the bolt, the base needs to ensure ground contact force. Because the contact that is not enough to support whole device behind the pinning universal wheel is stable, so further use the hydraulic pressure mode and closely laminate ground, hydraulic prop, track and sucking disc these three ground friction all are great, all are when the guarantee locking dish leans on tight bolt tip, and reaction force is unlikely to lead to whole device to leave the wheel hub bolt.

The flaw detection method of the hub bolt by using the device comprises the following steps:

the hub bolt flaw detection device is close to a hub, the height of the locking disc is adjusted to be consistent with the height of the hub, then a hydraulic support or a crawler belt or a sucker is discharged to be in contact with the ground, after the complete contact is guaranteed, the locking disc is rotated, hub bolts are aligned with all ultrasonic detectors and enter a probe clamp to drive a gear ring, so that a driving probe is close to the bolts, and after the ultrasonic probes are close to the end portions of the threads, a spraying part is started.

The ultrasonic probes are sequentially started, when one ultrasonic probe is started, firstly, damage detection of a first easily-broken position is carried out, specifically, a near-field signal is used, namely, an ultrasonic echo distance is locked in a near-field area (the focusing depth is 1L/5), echo signals are observed, if an obvious echo signal exists (the ultrasonic echo distance can be realized by adopting the existing instrument and cannot follow the ultrasonic echo distance any more), the defect of the first easily-broken position can be determined, and if the obvious echo signal does not exist, the defect of the first easily-broken position does not exist. And then detecting the damage of the second breakable position, specifically, locking the echo measuring distance in a far field area (focusing depth is at 3L/5 position) by using a far field signal, observing the echo signal, and confirming that the second breakable position has defects if the echo signal is obvious, or not if the echo signal is not obvious. And after the probes are used for completing the inspection in sequence, all the hub bolts are completely inspected.

The above technical solution is only an implementation manner of the present invention, and for those skilled in the art, based on the principle disclosed in the present invention, various modifications or variations can be easily made, and not limited to the structure described in the above specific embodiments of the present invention, so that the foregoing description is only preferred, and not restrictive.

Claims (9)

1. The utility model provides a wheel hub bolt device of detecting a flaw which characterized in that: the hub bolt flaw detection device comprises: the array docking tool comprises an array docking tool and a plurality of ultrasonic detectors arranged on the array docking tool;

the array butt joint tool comprises a base, a support and a locking disc;

the lower end of the bracket is connected with the base, and the upper end of the bracket is connected with the locking disc;

the locking disc is provided with a plurality of probe mounting holes penetrating through the front surface and the rear surface of the locking disc, and the ultrasonic detector is detachably mounted in the probe mounting holes.

2. The hub bolt flaw detection apparatus according to claim 1, characterized in that: the locking disc is disc-shaped, and a central through hole is formed in the center of the locking disc;

the upper part of the bracket is provided with a connecting arm, and the central axis of the connecting arm is parallel to the base;

a bearing is arranged in a central through hole of the locking disc, and the locking disc is arranged at the front end of the connecting arm through the bearing;

the plurality of probe mounting holes are uniformly distributed around the central through hole along the circumference.

3. The hub bolt flaw detection apparatus according to claim 2, characterized in that: the ultrasonic detector comprises an ultrasonic probe and a probe clamp; one end of the ultrasonic probe is arranged in the probe clamp;

the outer surface of the probe clamp is provided with external threads, the inner surface of each probe mounting hole in the locking disc is provided with internal threads, and the probe clamp is connected into the probe mounting holes through threads.

4. The hub bolt flaw detection apparatus according to claim 3, characterized in that: the hub bolt flaw detection device comprises a gear ring;

the gear ring is of a circular ring structure, and a plurality of teeth which are uniformly distributed along the circumference are arranged on the circular inner wall of the gear ring;

a circular ring coaxial with the locking disc is arranged on the rear side of the locking disc, a bearing is mounted on the inner wall of the circular ring, the circular outer wall of the gear ring is connected with the bearing, and the gear ring is connected to the locking disc through the bearing and can rotate relative to the gear disc;

a driven gear is arranged on the outer wall of each probe clamp;

the teeth on the driven gear on the outer wall of all the probe clamps can be meshed with the teeth on the gear ring at the same time.

5. The hub bolt flaw detection apparatus according to claim 4, characterized in that: the hub bolt flaw detection device comprises a spraying component;

the shower part includes: a hydraulic source, a central pressure tube and a multi-head distributor;

one end of the central pressure pipe is connected with a hydraulic source, and the other end of the central pressure pipe is connected with the multi-head distributor;

and each outlet of the multi-head distributor is respectively connected with a hydraulic conveying pipe on the ultrasonic probe.

6. The hub bolt flaw detection apparatus according to claim 1, characterized in that: the support adopts telescopic bracket.

7. The hub bolt flaw detection apparatus according to claim 1, characterized in that: the bracket is movably mounted on the base.

8. The hub bolt flaw detection apparatus according to claim 1, characterized in that: and universal wheels are arranged below the base.

9. The hub bolt flaw detection apparatus according to claim 1, characterized in that: and a hydraulic prop, a crawler belt or a sucker is arranged below or at the edge of the base.

Images