CN114165686A

CN114165686A - Multi-probe flaw detection device adaptable to complex curved surface of rocket solid engine shell

Info

Publication number: CN114165686A
Application number: CN202111402491.9A
Authority: CN
Inventors: 刘刚; 周泽军; 缪起; 舒畅; 马超
Original assignee: Chongqing One Space Aerospace Technology Co Ltd; Beijing Zero One Space Electronics Co Ltd; Beijing Zero One Space Technology Research Institute Co Ltd; Chongqing Zero One Space Technology Group Co Ltd; Xian Zero One Space Technology Co Ltd
Current assignee: Chongqing One Space Aerospace Technology Co Ltd; Beijing Zero One Space Electronics Co Ltd; Beijing Zero One Space Technology Research Institute Co Ltd; Chongqing Zero One Space Technology Group Co Ltd; Xian Zero One Space Technology Co Ltd
Priority date: 2021-11-24
Filing date: 2021-11-24
Publication date: 2022-03-11

Abstract

The invention relates to the field of workpiece surface detection, and particularly discloses a multi-probe flaw detection device suitable for complex curved surfaces of rocket solid engine shells, which comprises an installation frame, a connecting sheet, a detection probe group, a fixed sleeve, a pin shaft unit and a control unit for controlling the moving direction of the installation frame, wherein an installation hole penetrates through the connecting sheet, an opening is formed in one end, close to the connecting sheet, of the fixed sleeve, and one end of the detection probe group is fixed in the fixed sleeve; the pin shaft unit comprises a pin shaft and a sliding ring, the sliding ring is fixed on one side, close to the mounting frame, of the connecting piece, a sliding hole for the pin shaft to slide along the axial direction of the fixing sleeve is formed in the sliding ring, one end, far away from the sliding ring, of the pin shaft is fixed with the outer wall of the fixing sleeve, and the axis of the pin shaft is perpendicular to the axis of the fixing sleeve. In the scheme, the fixed sleeve synchronously drives the pin shaft and the detection probe group to move up and down along the sliding hole, the detection probe group is in a laminating state with the surface of the engine shell, and accurate flaw detection can be carried out on complex curved surfaces such as the engine shell.

Description

Multi-probe flaw detection device adaptable to complex curved surface of rocket solid engine shell

Technical Field

The invention relates to the technical field of workpiece surface detection, in particular to a multi-probe flaw detection device suitable for complex curved surfaces of rocket solid engine shells.

Background

The heat insulating layer is adhered inside the rocket solid engine, the safety performance of the rocket solid engine is directly influenced by the adhesion compactness of the heat insulating layer, the heat insulating layer is required to detect flaws after the rocket solid engine shell is processed, and one probe or a plurality of probes can be used for detecting flaws on the surface of the rocket solid engine at home and abroad.

When a single probe is used for flaw detection, the contact area between the single probe and the surface is small, so that the detection speed of the single probe is too low in the using process, the problem of low detection efficiency is solved when a small test piece is detected, and the requirement on the detection efficiency cannot be met when a large-size engine shell is detected. Meanwhile, in the use process of the probe, the relative distance between the probe and the surface to be detected is strictly limited, the accuracy degree of the detection of the surface of the engine shell is directly influenced, most of the existing multi-probe arrangement modes are linear, rectangular and the like, the support for connecting the probe is not telescopic, and meanwhile, the surface of the rocket engine shell is in a complex curved surface state, so that the probes which are orderly and hard arranged cannot meet the detection requirement of the complex curved surface, and only simple outer contour detection of a flat surface, the same plane and the like can be carried out.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a multi-probe flaw detection device suitable for complex curved surfaces of rocket solid engine shells, and aims to solve the problem that conventional hard-arranged probes are difficult to meet the detection requirements of complex curved surfaces.

In order to achieve the above object, the basic scheme of the invention is as follows: a multi-probe flaw detection device applicable to complex curved surfaces of rocket solid engine shells comprises a mounting rack, a connecting sheet, three detection probe groups, three groups of fixed sleeves and a control unit for controlling the moving direction of the mounting rack, wherein the mounting rack is fixedly connected with one side of the connecting sheet, three mounting holes penetrate through the connecting sheet, the three mounting holes are arranged in an equilateral triangle shape, one ends of the fixed sleeves penetrate through the mounting holes and are positioned between the connecting sheet and the mounting rack, openings are formed in one ends, close to the connecting sheet, of the fixed sleeves, the detection probe groups correspond to the fixed sleeves one by one, one ends of the detection probe groups penetrate through the mounting holes and the openings and are fixedly mounted in the fixed sleeves, and the other ends of the detection probe groups are coplanar with the opening ends of the fixed sleeves; still including round pin axle unit, round pin axle unit is including round pin axle and the ring that slides, and the ring fixed mounting that slides is equipped with on the ring that slides and supplies round pin axle along the gliding hole that slides of fixed sleeving's axial on the one side that the connection piece is close to the mounting bracket, and the one end and the fixed sleeving's outer wall fixed connection of the ring that slides are kept away from to the round pin axle, and the axis of round pin axle is perpendicular with fixed sleeving's axis.

The technical principle of the invention is as follows: when flaw detection is carried out on the surface of the engine shell, the control unit controls one side, away from the mounting frame, of the connecting sheet to be in contact with the surface of the engine shell, at the moment, the three detection probe groups and the three fixing sleeves move downwards along the mounting holes under the action of self gravity, at the moment, the fixing sleeves synchronously drive the pin shafts to move downwards along the sliding holes, the sliding rings and the pin shafts guide the downward movement of the fixing sleeves, after the detection probe groups to be detected are in contact with the surface of the engine shell, the downward movement of the fixing sleeves is stopped, then, the control unit controls the mounting frame to move, further, the detection probe groups are synchronously driven to move along the surface of the engine shell, and the detection probes carry out flaw detection on the surface of the engine shell; because the three groups of detection probes are in a triangular layout, the scanning area can be completely covered without repeated scanning during comprehensive flaw detection.

When the local surface of the engine shell is fluctuated or curved, the surface of the engine shell can be used for jacking or relaxing the detection probe group and the fixed sleeve, and the fixed sleeve can synchronously drive the pin shaft to move up and down along the sliding hole, so that the detection probe group and the surface of the engine shell are in a close fit state, the local fluctuation or curved part of the surface of the engine shell can be detected conveniently, and the detection efficiency of the local fluctuation or curved part of the surface of the engine shell is improved; therefore, the whole multi-probe flaw detection device suitable for the complex curved surfaces of the rocket solid engine shell can perform accurate flaw detection on the complex curved surfaces such as the engine shell.

Further, the mounting bracket includes first mount pad, a plurality of extension springs and a plurality of connecting rod, the one end of connecting rod and one side fixed connection of first mount pad, the other end of connecting rod and one side fixed connection of connection piece, the side of first mount pad is parallel with the side of connection piece, the one end of extension spring and one side fixed connection that first mount pad is close to the connection piece, the one end fixed connection of connection piece is kept away from with the test probe group to the other end of extension spring, the axis of extension spring is parallel with fixed sheathed tube axis.

When the fixed sleeve and the detection probe group move in a reciprocating manner along the mounting hole, the tension spring is compressed or stretched, so that the positions of the fixed sleeve and the detection probe are more elastic, and the detection probe can conveniently and rapidly move in a reciprocating manner when moving to a complex curved surface of an engine shell; meanwhile, the first mounting seat and the connecting rods can stably support the tension spring.

Further, the detection probe group includes the casing and from taking the probe of magnetic attraction, and probe fixed mounting is in the casing, and extension spring and adapter sleeve all with the outer wall fixed connection of casing.

When detecting a flaw on a complex curved surface of an engine shell, the magnetic attraction of the probe can enable the probe to be attached to the surface of the engine shell more accurately, so that the flaw detection on the local fluctuation or radian of the surface of the engine shell is facilitated, and meanwhile, the local fluctuation or radian of the surface of the engine shell can be improved for the detection efficiency.

The ball bearing fixing device comprises a first mounting seat, a connecting piece and a second mounting seat, wherein the first mounting seat is arranged on the first mounting seat, the second mounting seat is arranged on the second mounting seat, the connecting piece is provided with a first mounting hole, the first mounting hole is arranged on the first mounting seat, the second mounting hole is arranged on the second mounting seat, the connecting piece is provided with a plurality of spherical embedding grooves for embedding the balls, the embedding grooves of the connecting piece are provided with openings for exposing the balls, and the diameter of the openings is smaller than that of the balls; the balls are evenly distributed on the side surface of the connecting piece.

When flaw detection is carried out, the rolling balls are in rolling contact with the surface of the engine shell, and the contact mode is point contact, so that the surface of the engine shell can be effectively protected from rolling damage of the rolling balls; meanwhile, the arrangement of the balls can ensure that the probe is always at the same distance with the surface of the object to be detected, and the flaw detection precision of the probe is improved.

Further, the connection piece is kept away from the side of detecting probe group and is fixed mounting has the anticollision and touches the strake, and the edge of anticollision and touch strake parcel connection piece.

When the connection piece all around with engine housing bumps, the collision avoidance touch strake can cushion the collision between the engine housing who bumps and the connection piece, can effectively avoid engine housing surface to be damaged, also can protect the probe simultaneously.

The switch unit comprises a microswitch, a plurality of telescopic rods, a second mounting seat and a supporting seat, wherein one end of each telescopic rod is fixedly connected with one side of the first mounting seat, which is far away from the fixed sleeve, the other end of each telescopic rod is fixedly connected with one side of the second mounting seat, and the side surface of the second mounting seat is parallel to the side surface of the first mounting seat; one end of the supporting seat is fixedly arranged on one side, close to the telescopic rod, of the second mounting seat, and the micro switch is fixedly arranged on the other end of the supporting seat and can abut against one side, close to the telescopic rod, of the second mounting seat; the microswitch is electrically connected with the control unit.

When running into the local increase in height or the increase in height of radian that appears in engine housing surface, engine housing promotes the connection piece and shifts up, and this pressure passes through the connection piece, connecting rod and first mount pad and transmits to the telescopic link on for the telescopic link compression shortens, and then the upper surface of first mount pad offsets with the micro-gap switch on the supporting seat, and micro-gap switch is pressed the back, and the steerable control unit of micro-gap switch closes, and then lets first mount pad and second mount pad pause, prevents that whole device from continuing to remove and bumping.

And the other end of the pressure spring is fixedly connected with one side of the first mounting seat, which is far away from the fixed sleeve, of the first mounting seat.

When the telescopic rod is compressed and shortened, the pressure spring can be synchronously compressed to store energy; after the pressure between the connecting sheet and the surface of the engine shell is reduced, the pressure spring can rebound, so that the telescopic rod automatically extends, and the subsequent timely closing protection is facilitated.

Furthermore, one end of the pressure spring, which is close to the second mounting seat, is coaxially sleeved outside the supporting seat, and the axes of the pressure spring and the supporting seat are collinear with the axes of the first mounting seat and the second mounting seat.

Through the setting, the pressure spring can be spacing outside the supporting seat steadily, and the pressure spring can provide the support for first mount pad and second mount pad more steadily, and the elasticity of letting the pressure spring supports more stably.

Furthermore, the control unit comprises a fixed seat, a connecting seat, a first connecting arm, a second connecting arm, a third connecting arm, a fourth connecting arm and a fifth connecting arm which are sequentially and rotatably connected, wherein the fixed seat, the connecting seat and the first connecting arm are horizontally arranged, the rotating axis of the rotating position of the connecting seat and the fixed seat is vertical to the rotating axis of the rotating position of the connecting seat and the first connecting arm, the rotating axis of the rotating position of the connecting seat and the first connecting arm is parallel to the rotating axis of the rotating position of the first connecting arm and the second connecting arm, the third connecting arm and the fourth connecting arm are vertically arranged, the second connecting arm, the third connecting arm and the fourth connecting arm are coaxially and rotatably connected, and the rotating axis of the rotating position of the second connecting arm and the third connecting arm is vertical to the rotating axis of the rotating position of the first connecting arm and the second connecting arm; the fifth connecting arm is U-shaped, two ends of the fifth connecting arm are rotatably connected with one end of the fourth connecting arm, which is far away from the third connecting arm, and the rotating axis of the rotating part of the fifth connecting arm and the fourth connecting arm is vertical to the rotating axis of the connecting part of the fourth connecting arm and the third connecting arm; one side of the middle part of the fifth connecting arm, which is far away from the fourth connecting arm, is rotatably connected with the second mounting seat.

When controlling the position of probe, the turned angle or the direction of rotation of control connecting seat, first linking arm, second linking arm, third linking arm, fourth linking arm and fifth linking arm can be to the relative position of probe and engine case, simultaneously under the cooperation of connecting seat, first linking arm, second linking arm, third linking arm, fourth linking arm and fifth linking arm, the rotation that the probe can diversified and multi-angle, and then can be comprehensive detect a flaw to the surface of engine case.

Furthermore, a first motor for controlling the rotation of the connecting seat is fixedly installed between the fixed seat and the connecting seat, a second motor for controlling the rotation of the first connecting arm is fixedly installed between the connecting seat and the first connecting arm, a third motor for controlling the rotation of the second connecting arm is fixedly installed between the first connecting arm and the second connecting arm, a fourth motor for controlling the rotation of the third connecting arm and a fifth motor for controlling the rotation of the fourth connecting arm are fixedly connected to one end, far away from the third connecting arm, of the second connecting arm, and a sixth motor for controlling the rotation of two ends of the fifth connecting arm is arranged on the fifth connecting arm; the system also comprises a processor, a first controller for controlling the first motor, a second controller for controlling the second motor, a third controller for controlling the third motor, a fourth controller for controlling the fourth motor, a fifth controller for controlling the fifth motor and a sixth controller for controlling the sixth motor, wherein the first controller, the second controller, the third controller, the fourth controller, the fifth controller, the sixth controller, the microswitch and the probe are electrically connected with the processor.

When the rotating angles and directions of the connecting seat, the first connecting arm, the second connecting arm, the third connecting arm, the fourth connecting arm and the fifth connecting arm are controlled, an instruction is input into the processor, so that the first controller, the second controller, the third controller, the fourth controller, the fifth controller and the sixth controller respectively control the first motor to drive the connecting seat to rotate corresponding angles relative to the fixed seat, the second motor drives the first connecting arm to rotate corresponding angles relative to the connecting seat, the third motor drives the second connecting arm to rotate corresponding angles relative to the first connecting arm, the fourth motor drives the third connecting arm to coaxially rotate relative to the second connecting arm, the fifth motor also drives the fourth connecting arm to coaxially rotate relative to the third connecting arm, and then the sixth motor drives the two ends of the upper side of the fifth connecting arm to rotate corresponding angles relative to the fourth connecting arm, meanwhile, the sixth motor drives the lower side of the fifth connecting arm to drive the second mounting seat to coaxially rotate relative to the fifth connecting arm; through the control of the rotating angles and the positions of the connecting seat, the first connecting arm, the second connecting arm, the third connecting arm, the fourth connecting arm and the fifth connecting arm, the probe can be ensured to be opposite to the engine shell to be detected.

Drawings

FIG. 1 is a schematic structural diagram of a multi-probe flaw detection device adaptable to complex curved surfaces of rocket solid engine casings in the axial direction in the embodiment of the invention.

FIG. 2 is a schematic structural diagram of a multi-probe flaw detection device for complex curved surfaces of rocket solid engine casings, which is suitable for the axial direction measurement after a control unit is removed, according to the embodiment of the invention.

In the above drawings: the device comprises a first mounting seat 101, a connecting rod 102, a tension spring 103, a connecting piece 20, a mounting hole 201, a mounting groove 202, an anti-collision touch edge strip 203, a ball 301, a mounting ring 302, a blocking column 303, a blocking ring 304, a detection probe set 401, a fixed sleeve 402, a pin shaft 403, a sliding ring 404, a sliding hole 405, a second mounting seat 501, a microswitch 502, a telescopic rod 503, a compression spring 504, a supporting seat 505, a fixed seat 60, a connecting seat 601, a first connecting arm 602, a second connecting arm 603, a third connecting arm 604, a fourth connecting arm 605, a fifth connecting arm 606, a first motor 607, a second motor 608, a third motor 609, a fourth motor 610, a fifth motor 611 and a sixth motor 612.

Detailed Description

The technical solution of the present invention is further explained with reference to the drawings and the embodiments.

The embodiment of the invention provides a multi-probe flaw detection device suitable for complex curved surfaces of rocket solid engine shells, which is basically shown in fig. 1 and fig. 2, and comprises a mounting rack, a connecting sheet 20, three detection probe groups 401, three fixing sleeves 402, three balls 301, a switch unit and a control unit for controlling the moving direction of the mounting rack, wherein the switch unit comprises a microswitch 502, three telescopic rods 503, a second mounting seat 501, a pressure spring 504 and a supporting seat 505, the detection probe group 401 comprises a shell and a probe with magnetic attraction, and the probe is fixedly mounted in the shell.

As shown in fig. 2, the mounting frame includes a first mounting seat 101, three tension springs 103, three connecting rods 102 and three pin units, the upper ends of the connecting rods 102 are welded to the lower side of the first mounting seat 101, the lower ends of the connecting rods 102 are welded to the upper side of the connecting piece 20, the side surface of the first mounting seat 101 is parallel to the side surface of the connecting piece 20, and the lower ends of the three connecting rods 102 are distributed on the connecting piece 20 in a triangular manner; three mounting holes 201 penetrate through the connecting sheet 20, the three mounting holes 201 are arranged in an equilateral triangle and are positioned among the three connecting rods 102, the upper end of the fixed sleeve 402 penetrates through the mounting holes 201 and is positioned between the connecting sheet 20 and the mounting frame, the lower end of the fixed sleeve 402 is provided with an opening, the detection probe groups 401 correspond to the fixed sleeve 402 one by one, the upper ends of the detection probe groups 401 penetrate through the mounting holes 201 and the opening and are welded in the fixed sleeve 402, and the lower ends of the detection probe groups 401 are coplanar with the opening end of the fixed sleeve 402; the pin shaft unit comprises a pin shaft 403 and a sliding ring 404, the sliding ring 404 is welded at the edge of the upper side of the connecting piece 20, a sliding hole 405 for the pin shaft 403 to slide along the axial direction of the fixed sleeve 402 is arranged on the sliding ring 404, one end of the pin shaft 403, which is far away from the sliding ring 404, is welded with the outer wall of the fixed sleeve 402, and the axis of the pin shaft 403 is vertical to the axis of the fixed sleeve 402; meanwhile, the upper end of the tension spring 103 is welded to the lower side of the first mounting seat 101, the lower end of the tension spring 103 is welded to the upper end of the housing, and the axis of the tension spring 103 is parallel to the axis of the fixing sleeve 402.

As shown in fig. 2, a penetrating installation groove 202 is arranged at the edge of the connecting piece 20, an installation ring 302 is arranged in the lower end of the installation groove 202, a spherical caulking groove is arranged in the installation ring 302, a blocking column 303 is arranged in the installation groove 202 of the connecting piece 20, a blocking ring 304 is arranged at the upper end of the blocking column 303 in a buckling manner, the blocking ring 304 abuts against the upper surface of the connecting piece 20, the lower end of the blocking column 303 penetrates through the installation ring 302 and is located in the caulking groove, and the lower end of the blocking column 303 abuts against a ball 301; an opening for exposing the balls 301 is formed in the caulking groove of the mounting ring 302, the diameter of the opening is smaller than that of the balls 301, and the three balls 301 are uniformly distributed at the edge of the lower side surface of the connecting sheet 20; meanwhile, the side edge, far away from the detection probe group 401, of the connecting sheet 20 is glued with the anti-collision touch strip 203, and the edge of the connecting sheet 20 is wrapped by the anti-collision touch strip 203.

Meanwhile, as shown in fig. 2, the lower end of the telescopic rod 503 is welded to the upper side of the first mounting seat 101, the upper end of the telescopic rod 503 is welded to the lower side of the second mounting seat 501, and the side surface of the second mounting seat 501 is parallel to the side surface of the first mounting seat 101; the upper end of the supporting seat 505 is welded on the lower side of the second mounting seat 501, and the micro switch 502 is welded on the lower end of the supporting seat 505 and can be abutted against the upper side of the second mounting seat 501; meanwhile, the upper end of the compressed spring 504 is welded to the lower side of the second mounting seat 501, the lower end of the compressed spring 504 is welded to the upper side of the first mounting seat 101, one end of the compressed spring 504, which is close to the second mounting seat 501, is coaxially sleeved outside the supporting seat 505, and the axes of the compressed spring 504 and the supporting seat 505 are collinear with the axes of the first mounting seat 101 and the second mounting seat 501.

As shown in fig. 1, the control unit includes a fixing base 60, a connecting base 601, a first connecting arm 602, a second connecting arm 603 and a third connecting arm 604 which are rotatably connected in sequence, a fourth connecting arm 605 and a fifth connecting arm 606, wherein the fixed seat 60, the connecting seat 601 and the first connecting arm 602 are horizontally arranged, the rotation axis of the rotation position of the connecting seat 601 and the fixed seat 60 is vertical to the rotation axis of the rotation position of the connecting seat 601 and the first connecting arm 602, the rotation axis of the rotation position of the connecting seat 601 and the first connecting arm 602 is parallel to the rotation axis of the rotation position of the first connecting arm 602 and the second connecting arm 603, the third connecting arm 604 and the fourth connecting arm 605 are vertically arranged, the second connecting arm 603, the third connecting arm 604 and the fourth connecting arm 605 are coaxially and rotatably connected, and the rotation axis of the rotation position of the second connecting arm 603 and the third connecting arm 604 is vertical to the rotation axis of the rotation position of the first connecting arm 602 and the second connecting arm 603; the fifth connecting arm 606 is U-shaped, two ends of the fifth connecting arm 606 are rotatably connected with one end of the fourth connecting arm 605 far away from the third connecting arm 604, and the rotating axis of the rotating position of the fifth connecting arm 606 and the fourth connecting arm 605 is perpendicular to the rotating axis of the connecting position of the fourth connecting arm 605 and the third connecting arm 604; the side of the middle part of the fifth connecting arm 606 away from the fourth connecting arm 605 is rotatably connected with the second mounting seat 501; meanwhile, a first motor 607 for controlling the rotation of the connecting base 601 is fixedly installed between the fixed base 60 and the connecting base 601, a second motor 608 for controlling the rotation of the first connecting arm 602 is fixedly installed between the connecting base 601 and the first connecting arm 602, a third motor 609 for controlling the rotation of the second connecting arm 603 is fixedly installed between the first connecting arm 602 and the second connecting arm 603, a fourth motor 610 for controlling the rotation of the third connecting arm 604 and a fifth motor 611 for controlling the rotation of the fourth connecting arm 605 are fixedly connected to one end of the second connecting arm 603 far away from the third connecting arm 604, and a sixth motor 612 for controlling the rotation of both ends of the fifth connecting arm 606 is arranged on the fifth connecting arm 606.

Further included are a processor, a first controller to control the first motor 607, a second controller to control the second motor 608, a third controller to control the third motor 609, a fourth controller to control the fourth motor 610, a fifth controller to control the fifth motor 611, and a sixth controller to control the sixth motor 612, the first controller, the second controller, the third controller, the fourth controller, the fifth controller, the sixth controller, the microswitch 502, and the probe all being electrically coupled to the processor.

In the embodiment of the multi-probe flaw detection device suitable for the complex curved surface of the rocket solid engine shell, when the device is used, the engine shell to be detected is firstly placed under the connecting sheet 20, and then an instruction can be input into the processor, so that the first controller, the second controller, the third controller, the fourth controller, the fifth controller and the sixth controller respectively control the first motor 607 to drive the connecting seat 601 to rotate by a corresponding angle relative to the fixed seat 60, the second motor 608 drives the first connecting arm 602 to rotate by a corresponding angle relative to the connecting seat 601, the third motor 609 drives the second connecting arm 603 to rotate by a corresponding angle relative to the first connecting arm 602, the fourth motor 610 drives the third connecting arm 604 to coaxially rotate relative to the second connecting arm 603, the fifth motor 611 also drives the fourth connecting arm 605 to coaxially rotate relative to the third connecting arm 604, and then the sixth motor 612 drives the two ends of the upper side of the fifth connecting arm 606 to rotate by a corresponding angle relative to the fourth connecting arm 605, meanwhile, the sixth motor 612 drives the lower side of the fifth connecting arm 606 to drive the second mounting seat 501 to rotate coaxially relative to the fifth connecting arm 606; through the above control of the rotation angles and positions of the connecting seat 601, the first connecting arm 602, the second connecting arm 603, the third connecting arm 604, the fourth connecting arm 605 and the fifth connecting arm 606, it can be ensured that the lower surface of the connecting piece 20 is opposite to the engine housing to be tested, and the ball 301 is in contact with the surface of the engine housing to be tested.

After the balls 301 are contacted with the surface of the engine shell to be detected, the three groups of detection probe groups 401 and the three groups of fixing sleeves 402 move downwards along the mounting hole 201 under the action of self gravity and probe magnetic attraction, the three groups of detection probe groups 401 and the fixing sleeves 402 drive the pin shaft 403 to vertically move downwards along the sliding hole 405, the tension spring 103 is stretched, the probes are attached to the surface of the engine shell, the probes with magnetic attraction are closely attached to the surface of the engine shell, flatness information of the surface of the engine shell is collected, the collected information is transmitted to a processor, and the processor processes and analyzes the surface information of the engine shell to finish flaw detection judgment; in the process, under the driving of the connecting seat 601, the first connecting arm 602, the second connecting arm 603, the third connecting arm 604, the fourth connecting arm 605 and the fifth connecting arm 606, the three groups of detection probe groups 401 and the three groups of fixing sleeves 402 can synchronously move to perform comprehensive flaw detection on the surface of the engine shell, and in the moving process, the rolling ball 301 is in rolling contact with the surface of the engine shell in a point contact mode, so that the surface of the engine shell can be effectively protected from rolling damage of the rolling ball 301; meanwhile, the arrangement of the ball 301 can ensure that the probe is always at the same distance with the surface of the object to be detected, so that the flaw detection precision of the probe is improved; meanwhile, the three detection probe groups 401 are in a triangular layout, so that the scanning area can be completely covered during comprehensive flaw detection without repeated scanning.

When meeting engine case surface local undulation or radian, engine case's surface can carry out roof pressure or relaxation to probe and fixed sleeve 402, and fixed sleeve 402 can drive round pin axle 403 along sliding hole 405 reciprocating in step this moment for the probe is in the state of laminating closely with engine case's surface, is convenient for detect the detection to engine case surface local undulation or radian department, makes engine case surface local undulation or radian department improve detection efficiency.

When the height of the surface of the engine shell is locally increased or the radian of the surface of the engine shell is increased, the edge of the connecting sheet 20 is easy to collide with the protruding part of the engine shell, and at the moment, the anti-collision touch strip 203 can buffer the collision between the collided engine shell and the connecting sheet 20, so that the surface of the engine shell can be effectively prevented from being damaged, and meanwhile, the probe can be protected; meanwhile, the engine housing pushes the connecting piece 20 to move upwards, the pressure is transmitted to the telescopic rod 503 and the compression spring 504 through the connecting piece 20, the connecting rod 102 and the first mounting seat 101, the telescopic rod 503 and the compression spring 504 are compressed and shortened, further, the upper surface of the first mounting seat 101 abuts against the micro switch 502 on the supporting seat 505, after the micro switch 502 is pressed, a closing signal is transmitted to the processor, the processor controls the first controller, the second controller, the third controller, the fourth controller, the fifth controller and the sixth controller to send out a closing signal, so that the rotation and the movement of the connecting seat 601, the first connecting arm 602, the second connecting arm 603, the third connecting arm 604, the fourth connecting arm 605 and the fifth connecting arm 606 are synchronously stopped, and the equipment can be stopped immediately when collision occurs.

Through the process, the whole multi-probe flaw detection device suitable for the complex curved surfaces of the rocket solid engine shell can accurately detect flaws on the complex curved surfaces such as the engine shell, can accurately control the detection position in the detection process, and can protect the surfaces of the probe and the engine shell in time.

Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.

Claims

1. A multi-probe flaw detection device suitable for complex curved surfaces of rocket solid engine shells is characterized by comprising an installation frame, a connecting sheet, three detection probe groups, three fixed sleeves and a control unit for controlling the moving direction of the installation frame, wherein the installation frame is fixedly connected with one side of the connecting sheet, three installation holes penetrate through the connecting sheet and are arranged in an equilateral triangle shape, one end of each fixed sleeve penetrates through the installation holes and is positioned between the connecting sheet and the installation frame, one end of each fixed sleeve, which is close to the connecting sheet, is provided with an opening, the detection probe groups correspond to the fixed sleeves one by one, one end of each detection probe group penetrates through the installation holes and the openings and is fixedly installed in the fixed sleeves, and the other end of each detection probe group is coplanar with the opening end of the corresponding fixed sleeve; still include round pin axle unit, round pin axle unit is including round pin axle and slip ring, and the slip ring fixed mounting is equipped with on the slip ring and supplies round pin axle along the gliding hole that slides of fixed sleeving's axial on the one side that the connection piece is close to the mounting bracket, and the one end and the fixed sleeving's outer wall fixed connection of slip ring are kept away from to the round pin axle, and the axis of round pin axle is perpendicular with fixed sleeving's axis.

2. The multi-probe flaw detection device suitable for the complex curved surface of the rocket solid engine shell as claimed in claim 1, wherein the mounting frame comprises a first mounting seat, a plurality of tension springs and a plurality of connecting rods, one end of each connecting rod is fixedly connected with one side of the first mounting seat, the other end of each connecting rod is fixedly connected with one side of the connecting piece, the side surface of the first mounting seat is parallel to the side surface of the connecting piece, one end of each tension spring is fixedly connected with one side of the first mounting seat close to the connecting piece, the other end of each tension spring is fixedly connected with one end of the detection probe group far away from the connecting piece, and the axis of each tension spring is parallel to the axis of the fixed sleeve.

3. The multi-probe flaw detection device suitable for the complex curved surface of the rocket solid engine shell as claimed in claim 2, wherein the detection probe set comprises a shell and a probe with magnetic attraction, the probe is fixedly installed in the shell, and the tension spring and the fixed sleeve are fixedly connected with the outer wall of the shell.

4. The multi-probe flaw detection device suitable for the complex curved surface of the rocket solid engine shell according to claim 3, further comprising a plurality of balls, wherein a spherical caulking groove for embedding the balls is formed in one side of the connecting sheet away from the first mounting seat, an opening for exposing the balls is formed in the caulking groove of the connecting sheet, and the diameter of the opening is smaller than that of the balls; the plurality of balls are uniformly distributed on the side face of the connecting piece.

5. The multi-probe flaw detection device suitable for the complex curved surface of the rocket solid engine shell as recited in claim 4, wherein an anti-collision touch strip is fixedly mounted on the side of the connecting sheet far away from the detection probe group, and the anti-collision touch strip wraps the edge of the connecting sheet.

6. The multi-probe flaw detection device suitable for the complex curved surface of the rocket solid engine shell according to claim 5, further comprising a switch unit, wherein the switch unit comprises a micro switch, a plurality of telescopic rods, a second mounting seat and a supporting seat, one end of each telescopic rod is fixedly connected with one side of the first mounting seat, which is far away from the fixed sleeve, the other end of each telescopic rod is fixedly connected with one side of the second mounting seat, and the side surface of the second mounting seat is parallel to the side surface of the first mounting seat; one end of the supporting seat is fixedly arranged on one side, close to the telescopic rod, of the second mounting seat, and the micro switch is fixedly arranged on the other end of the supporting seat and can abut against one side, close to the telescopic rod, of the second mounting seat; the micro switch is electrically connected with the control unit.

7. The multi-probe flaw detection device suitable for the complex curved surface of the rocket solid engine shell according to claim 6, further comprising a pressure spring, wherein one end of the pressure spring is fixedly connected with one side of the second mounting seat close to the telescopic rod, and the other end of the pressure spring is fixedly connected with one side of the first mounting seat far away from the fixed sleeve.

8. The multi-probe flaw detection device suitable for the complex curved surface of the rocket solid engine shell as recited in claim 7, wherein an end of the pressure spring close to the second mounting seat is coaxially sleeved outside the supporting seat, and axes of the pressure spring and the supporting seat are collinear with axes of the first mounting seat and the second mounting seat.

9. The multi-probe flaw detection device for the complex curved surface of the rocket solid engine shell according to claim 8, the control unit comprises a fixed seat, a connecting seat, a first connecting arm, a second connecting arm, a third connecting arm, a fourth connecting arm and a fifth connecting arm which are sequentially and rotatably connected, wherein the fixed seat, the connecting seat and the first connecting arm are horizontally arranged, the rotating axis of the rotating position of the connecting seat and the fixed seat is vertical to the rotating axis of the rotating position of the connecting seat and the first connecting arm, the rotating axis of the rotating position of the connecting seat and the first connecting arm is parallel to the rotating axis of the rotating position of the first connecting arm and the second connecting arm, the third connecting arm and the fourth connecting arm are vertically arranged, the second connecting arm, the third connecting arm and the fourth connecting arm are coaxially and rotatably connected, and the rotating axis of the rotating position of the second connecting arm and the third connecting arm is vertical to the rotating axis of the rotating position of the first connecting arm and the second connecting arm; the fifth connecting arm is U-shaped, two ends of the fifth connecting arm are rotatably connected with one end of the fourth connecting arm, which is far away from the third connecting arm, and the rotating axis of the rotating part of the fifth connecting arm and the fourth connecting arm is vertical to the rotating axis of the connecting part of the fourth connecting arm and the third connecting arm; one side of the middle part of the fifth connecting arm, which is far away from the fourth connecting arm, is rotatably connected with the second mounting seat.

10. The multi-probe flaw detection device suitable for the complex curved surface of the rocket solid engine shell as claimed in claim 9, wherein a first motor for controlling the rotation of the connecting seat is fixedly installed between the fixing seat and the connecting seat, a second motor for controlling the rotation of the first connecting arm is fixedly installed between the connecting seat and the first connecting arm, a third motor for controlling the rotation of the second connecting arm is fixedly installed between the first connecting arm and the second connecting arm, a fourth motor for controlling the rotation of the third connecting arm and a fifth motor for controlling the rotation of the fourth connecting arm are fixedly connected to one end of the second connecting arm far away from the third connecting arm, and a sixth motor for controlling the rotation of both ends of the fifth connecting arm is arranged on the fifth connecting arm; the system also comprises a processor, a first controller for controlling the first motor, a second controller for controlling the second motor, a third controller for controlling the third motor, a fourth controller for controlling the fourth motor, a fifth controller for controlling the fifth motor and a sixth controller for controlling the sixth motor, wherein the first controller, the second controller, the third controller, the fourth controller, the fifth controller, the sixth controller, the microswitch and the probe are electrically connected with the processor.