An automatic control gamma flaw detector with self-locking function

Abstract

The present invention provides an automatic control type gamma flaw detector with a self-locking function, comprising a small sealed source, a large sealed source, a bent pipe, a radioactive source, a control source connecting end, a source delivery pipe connecting end, and a self-locking transmission component, which are arranged in a main body of the flaw detector. The small sealed source rotates in the large sealed source. When the control end hole of the small sealed source is coaxial with the control end hole of the large sealed source, the source delivery pipe hole of the small sealed source is opposite to the source delivery pipe hole of the large sealed source. The radioactive source moves along the bent pipe and the source delivery pipe of the source delivery pipe connecting end under the drive of a cable passing through the control source connecting end. The self-locking transmission component realizes the locking of the control source connecting end, the source delivery pipe connecting end and the flaw detector main body.

Description

Technical Field

[0001] The invention relates to a flaw detector, in particular to an automatic control type gamma flaw detector with a self-locking function. Background Art

[0002] A gamma flaw detector uses gamma rays for nondestructive testing and is widely used in industry, particularly for detecting internal defects in metal materials. Patent application number 2010206538072 describes an automatically controlled gamma flaw detector comprising a small sealed source, a large sealed source, a motor drive, and a circuit control system. The small sealed source is equipped with a source braid. When the small sealed source rotates under the control of the motor drive and aligns the source braid with the window of the large sealed source, the source braid emits radiation. This structure is suitable for directional exposure of a specific location on a workpiece, but it cannot meet the requirements for simultaneous circumferential exposure of large-diameter welds, i.e., completing flaw detection of the entire weld circumference in one go. Summary of the Invention

[0003] The purpose of the present invention is to provide an automatic control type gamma flaw detector with a self-locking function, comprising a small sealed source, a large sealed source, a bent pipe, a radioactive source, a control source connection end, a source pipe connection end, and a self-locking transmission component arranged in the main body of the flaw detector, the control source connection end includes an end cover gear, a protective cover, and a hollow pipe, the source pipe connection end includes a source pipe, a window is set on the side wall of the flaw detector main body, the large sealed source is fixed in the main body of the flaw detector, a large sealed source control end hole is set at the end of the large sealed source and a large sealed source source pipe hole facing the window is set on the side wall, a small sealed source is rotatably arranged in the large sealed source, a small sealed source control end hole is set at the end of the small sealed source and a small sealed source source pipe hole is set on the side wall, When the sealed source control end hole is coaxial with the large sealed source control end hole, the small sealed source source delivery tube hole is opposite to the large sealed source source delivery tube hole, a bent pipe is arranged between the small sealed source control end hole and the small sealed source source delivery tube hole, the radioactive source is arranged in the bent pipe, the end cover gear is rotatably arranged on the main body shell of the flaw detector, the protective cover is detachably arranged on the end cover gear, one end of the hollow tube passes through the protective cover and the other end is sealedly connected to the cable telescopic mechanism, the cable passes through the hollow tube, one end of the cable is connected to the cable telescopic machine and the other end passes through the end cover gear, the large sealed source control end hole, and the small sealed source control end hole and is detachably connected to the radioactive source, the source delivery tube is connected to the bent pipe, and when the end cover gear rotates, the source delivery tube is locked by the self-locking transmission component.

[0004] Furthermore, the self-locking transmission component includes a self-locking transmission component housing, and a first gear, a bevel gear set, a first threaded rod, a rocker-connecting rod mechanism, a second threaded rod, a gear set, and a fourth gear arranged in the self-locking transmission component housing. The first gear is engaged with the end cover gear, the first gear is connected to the first threaded rod through the bevel gear set, the first threaded rod is connected to the second threaded rod through the rocker-connecting rod mechanism, the second threaded rod is connected to the fourth gear through the gear set, and a mechanism for locking the source pipe locking piece is provided on the fourth gear.

[0005] Furthermore, the rocker-connecting rod mechanism includes a first connecting rod, a second connecting rod, a third connecting rod, a fourth connecting rod, a fifth connecting rod, a first double rocker arm, a second double rocker arm, and a third double rocker arm. One end of the first connecting rod is fixedly connected to the other end of the first threaded rod. The first rocker arm of the first double rocker arm is rotatably connected to the other end of the first connecting rod. The rotation fulcrum of the first double rocker arm is rotatably connected to the inner wall of the self-locking transmission component housing. The first rocker arm end of the first double rocker arm is connected to the inner wall of the self-locking transmission component housing through a first spring. One end of the second connecting rod is rotatably connected to the inner wall of the self-locking transmission component housing. One end of the third connecting rod is The other end of the second connecting rod is rotatably connected, the other end of the third connecting rod is rotatably connected to the other end of the first connecting rod, one end of the fourth connecting rod is rotatably connected to the second rocker arm of the first double rocker arm, the first rocker arm of the second double rocker arm is rotatably connected to the other end of the second connecting rod, the rotation fulcrum of the second double rocker arm is connected to the inner wall of the self-locking transmission component shell, the first rocker arm of the third double rocker arm is rotatably connected to the second rocker arm of the second double rocker arm, the second rocker arm of the third double rocker arm is rotatably connected to the inner wall of the self-locking transmission component shell, one end of the fifth connecting rod is rotatably connected to the rotation fulcrum of the third double rocker arm, and one end of the second threaded rod is fixedly connected to the other end of the third connecting rod.

[0006] Furthermore, the rotating fulcrum of the second double rocker arm is connected to the self-locking transmission component housing through an expansion nut, and a rocker hook is provided on the second double rocker arm; the self-locking transmission component also includes a first crank, one end of the first crank is connected to the inner wall of the self-locking transmission component housing through a second spring, the middle part of the first crank is connected to the inner wall of the self-locking transmission component housing through an expansion nut, and the other end of the first crank is provided with a crank hook matching the rocker hook; a first locking hole and a second locking hole are provided on the side wall of the self-locking transmission component housing, the position of the first locking hole corresponds to the expansion nut of the second double rocker arm, and the second locking hole corresponds to the expansion nut of the first crank.

[0007] Furthermore, the expansion nut includes a fixed end, a bearing end, an expansion airbag and several support rods. The fixed end is rotatably connected to the self-locking transmission component housing. The two ends of each support rod are respectively fixedly connected to the fixed end and the bearing end. The bearing end is arranged in a through hole at the second double rocker arm rotation fulcrum or the first crank rotation axis and is fixedly connected to the second double rocker arm or the first crank. The expansion airbag is circular and fixed in the fence formed by the support rods.

[0008] Furthermore, the control source connection end also includes an end cover, which is sleeved on the protective cover, and a locking buckle is fixed on the end cover, a hook-shaped component is provided at the end of the locking buckle, and an arc groove is provided on the end face of the end cover gear facing the end cover, and a protrusion is provided on the inner wall of the arc groove parallel to the axial direction of the rotation axis of the end cover gear. The protrusion extends from the side wall of the arc groove along the radial direction of the end cover gear to the other side wall until it is away from the other side wall by the diameter of the locking buckle, and the protrusion matches the groove of the hook-shaped component of the locking buckle.

[0009] Furthermore, a mechanism for locking the source pipe locking piece on the fourth gear includes a fourth gear housing, a plurality of locking blocks, a plurality of guide rods, and a plurality of locking columns. The fourth gear housing is fixed to the end face of the fourth gear and is rotatably connected to the inner wall of the self-locking transmission component housing. A plurality of linear guide rails are provided on the inner wall of the fourth gear housing perpendicular to the rotating shaft. A plurality of arc holes are provided on the end face of the fourth gear housing, the same number as the linear guide rails. Each guide rod is provided in a corresponding arc hole. One end of each locking column is fixedly connected to the corresponding guide rod and moves in the corresponding linear guide rail. Each locking block is fixed to the end of the corresponding locking column and is located in the fourth gear shaft hole axially arranged on the fourth gear. The source pipe locking piece is provided in the fourth gear shaft hole.

[0010] Furthermore, five arc-shaped holes are provided, each arc-shaped hole extends outward from a position close to the fourth gear shaft hole, and the extended lines of the arc chords of the five arc-shaped holes intersect and form a regular pentagon.

[0011] Furthermore, a strong magnet at the radiation source end is provided at one end of the radiation source, and a strong magnet at the control source end is provided at the other end of the cable. The strong magnet at the radiation source end and the strong magnet at the control source end are matched and connected, and the diameter of the hole at the control end of the small sealed source is smaller than the diameter of the strong magnet at the radiation source end and larger than the diameter of the strong magnet at the control source end.

[0012] Furthermore, the rotating shaft of the small sealed source is collinear with the axis of the small sealed source, the control end hole of the small sealed source is an eccentric hole, and the control end hole of the large sealed source is an eccentric hole.

[0013] Compared with the prior art, the present invention has the following advantages: (1) a source delivery tube is provided at the window of the large sealed source, and by providing a drive cable and other structures, the gamma flaw detector can be switched from a directional exposure mode to a circumferential exposure mode; (2) the control source connection end and the source delivery tube connection end can be locked at the same time by a self-locking transmission component to prevent radiation leakage.

[0014] The present invention will be further described below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention.

[0016] Figure 2This is a schematic structural diagram from a first perspective of the combination of the control source connection terminal and other components of the present invention.

[0017] Figure 3 This is a schematic diagram of the structure of the present invention after removing the self-locking transmission component.

[0018] Figure 4 Schematic diagram of the connection between the source pipe locking member and the source pipe cover of the present invention.

[0019] Figure 5 This is a schematic diagram of the combined structure of the control source connection end, motor transmission device, and large sealed source.

[0020] Figure 6 Schematic diagram of the connection method between the large sealed source and the small sealed source.

[0021] Figure 7 Schematic diagram of the combined structure of large sealed source and small sealed source.

[0022] Figure 8 This is a structural diagram of the control source connection end of the present invention.

[0023] Figure 9 This is a schematic diagram of the connection between the strong magnetic field at the radiation source end and the strong magnetic field at the control source end of the present invention.

[0024] Figure 10 It is a structural schematic diagram of the self-locking transmission component of the present invention.

[0025] Figure 11 It is a structural schematic diagram of the rocker arm-connecting rod mechanism of the present invention.

[0026] Figure 12 It is a schematic diagram of the gear set and the fourth gear combination structure of the present invention.

[0027] Figure 13 This is a schematic diagram of the structure of the locking block and other parts in the fourth gear of the present invention.

[0028] Figure 14 Schematic diagram of the fourth gear housing mechanism of the present invention.

[0029] Figure 15 This is a structural schematic diagram of the expansion nut of the present invention.

[0030] Among them, the flaw detector body 100, the radiation protection shell 101, the small sealed source 102, the small sealed source control end hole 1021, the small sealed source source pipe hole 1022, the limiting groove 1023, the large sealed source 103, the large sealed source control end hole 1031, the large sealed source source pipe hole 1032, the limiting block 1033, the window 104, the source pipe cover 105, the radiation source through hole 1051, the locking groove 1052, the radiation source cover 106, and the motor transmission device 107 , curved tube 108, radiation source 109, radiation source end strong magnet 1091, control source connection end 200, end cover 201, protective cover 202, locking buckle 203, control source end strong magnet 204, hollow tube 205, end cover gear 206, arc groove 2061, protrusion 2062, cable 207, source pipe connection end 300, source pipe locking member 301, pin 3011, source pipe 302, self-locking transmission component 400, self-locking transmission component housing 480, First locking hole 481, second locking hole 482, mounting hole 483, first gear 401, second gear 402, third gear 403, fourth gear 404, fourth gear shaft hole 4041, locking block 4042, guide rod 4043, locking column 4044, arc hole 4045, fourth gear housing 4046, linear guide rail 4047, first bevel gear 411, second bevel gear 412, first threaded rod 421, second threaded rod 422, first A connecting rod 431, a second connecting rod 432, a third connecting rod 433, a fourth connecting rod 434, a fifth connecting rod 435, a first crank 441, a crank hook 4411, a first double rocker arm 451, a second double rocker arm 452, a rocker hook 4521, a third double rocker arm 453, a first spring 461, a second spring 462, an expansion nut 471, a fixed end 4711, a support rod 4712, an expansion airbag 4713, a bearing end 4714, and a circuit control system 500. DETAILED DESCRIPTION

[0031] Combine Figure 1 、 Figure 2 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 10An automatic control type gamma flaw detector with a self-locking function includes a flaw detector body 100, a control source connection end 200, a source pipe connection end 300, a self-locking transmission component 400, a motor transmission device 107, and a circuit control system 500. A window 104 is provided on the side wall of the flaw detector body 100, and a small sealed source 102 and a large sealed source 103 are provided in the flaw detector body 100. The small sealed source 102 is rotatably arranged in the large sealed source 103, and the circuit control system 500 controls the motor transmission device 107 to drive the small sealed source 102 to rotate. The large sealed source 103 is fixed in the flaw detector body 100, and the large sealed source 103 is cylindrical and hollow inside. The small sealed source 102 is rotatably arranged in the large sealed source 103, and the small sealed source 102 is cylindrical and hollow inside. Large sealed source 103 has a large sealed source control port 1031 at its end and a large sealed source delivery tube port 1032 on its sidewall, facing window 104. Small sealed source 102 has a small sealed source control port 1021 at its end and a small sealed source delivery tube port 1022 on its sidewall. Bend 108 is located between small sealed source control port 1021 and small sealed source delivery tube port 1022, and a radioactive source 109 is housed within bend 108. A self-locking transmission assembly 400 secures the control source connection 200 to the large sealed source 103 and secures the delivery tube connection 300 to the flaw detector body 100.

[0032] Combine Figure 1 、 Figure 3 A source tube cover 105 is provided at the window 104, and a radiation source sealing cover 106 is provided on the source tube cover 105. The source tube connection end 300 includes a source tube locking member 301 and a source tube 302. The source tube locking member 301 is sleeved onto the end of the source tube 302 to provide sealing and shielding. When not in operation, the radiation source sealing cover 106 covers the opening of the source tube cover 105. When in operation, the radiation source sealing cover 106 is opened, and the source tube locking member 301 is inserted into the opening of the source tube cover 105. The radiation source 109 is emitted from the small sealed source 102, passes through the small sealed source source tube hole 1022 and the large sealed source source tube hole 1032, and then enters the source tube 302.

[0033] Combine Figure 4The source tube locking member 301 is provided with a latch 3011 having a hook-shaped end. The source tube housing 105 is provided with a radiation source through hole 1051, through which the radiation source 109 is emitted. A circle of protrusions is provided along the circumference of the inner wall of the radiation source through hole 1051. The end surface of the protrusions facing the source tube 302 is provided with an arc-shaped locking member groove 1052. The locking member groove 1052 is provided with a block perpendicular to the axis of the radiation source through hole 1051, which cooperates with the hook-shaped end of the latch 3011. When the source tube locking member 301 is inserted into the radiation source through hole 1051 of the source tube housing 105, the latch 3011 enters the locking member groove 1052, and the source tube locking member 301 rotates. The hook-shaped structure at the end of the latch 3011 cooperates with the block to lock the source tube locking member 301 and the source tube housing 105.

[0034] Combine Figure 5 、 Figure 6 、 Figure 7 The rotation axis of small sealed source 102 is collinear with its axis. Small sealed source control port 1021 is eccentric, and large sealed source control port 1031 is also eccentric. To align the rotation axis of small sealed source 102 with its axis, several gears are provided to offset the rotational power provided by the rotation axis of motor transmission 107 onto the axis of small sealed source 102. When the gamma flaw detector is not working, the small sealed source control end hole 1021 is not aligned with the large sealed source control end hole 1031, and the large sealed source source delivery tube hole 1032 is facing the window 104, but the small sealed source source delivery tube hole 1022 is not aligned with the large sealed source source delivery tube hole 1032, and the radiation from the radioactive source 109 cannot be radiated out from the window 104 and the large sealed source control end hole 1031; when it needs to work, the motor transmission device 107 drives the small sealed source 102 to rotate, and when the small sealed source source delivery tube hole 1022 is facing the large sealed source source delivery tube hole 1032, the small sealed source control end hole 1021 is aligned with the large sealed source control end hole 1031, and the radioactive source 109 can be emitted from the window 104.

[0035] Combine Figure 6 When the small sealed source 102 rotates, in order to facilitate the alignment of the small sealed source delivery tube hole 1022 and the large sealed source delivery tube hole 1032, the small sealed source control end hole 1021 and the large sealed source control end hole 1031 are aligned, an arc-shaped limiting groove 1023 is provided along the circumferential direction on the outer wall of the small sealed source 102, and a limiting block 1033 matching the limiting groove 1023 is provided on the inner wall of the large sealed source 103. When the inner side wall surfaces of the two end portions of the limiting groove 1023 respectively contact the limiting block 1033, it indicates that the small sealed source delivery tube hole 1022 and the large sealed source delivery tube hole 1032 are aligned or staggered.

[0036] Combine Figure 2 、 Figure 8The control source connection end 200 includes an end cap 201, a protective cover 202, a locking buckle 203, a hollow tube 205, an end cap gear 206, and a cable 207. The end cap gear 206 is rotatably connected to the end of the large sealed source 103. The axis of the end cap gear 206 is defined by a through hole, which is coaxial with the large sealed source control end hole 1031. The end cap 201 is detachably connected to the end cap gear 206 and has an axial through hole. The protective cover 202 is positioned within the axial through hole of the end cap 201 to prevent radiation leakage. One end of the hollow tube 205 passes through the protective cover 202 and the other end is sealedly connected to the cable retractor mechanism. A cable 207 passes through the hollow tube 205. One end of the cable 207 is connected to the cable retractor mechanism, and the other end passes through the end cap gear 206, the large sealed source control end hole 1031, and the small sealed source control end hole 1021 to detachably connect to the radiation source 109.

[0037] Combine Figure 8 A locking buckle 203 is fixedly provided on the front end surface of the end cover 201 facing the small sealing source 102 and the end cover gear 206, and a hook-shaped component is provided at the end of the locking buckle 203. A bearing is provided on the inner wall of the through hole on the axis of the end cover gear 206, and the end cover gear 206 is rotatably connected to the large sealing source 103 through the bearing. An arcuate groove 2061 is provided on the end surface of the end cover gear 206 facing the end cover 201, which is used to match the locking buckle 203. A protrusion 2062 is provided on the inner wall of the arcuate groove 2061 parallel to the axial direction of the rotation axis of the end cover gear 206. The protrusion 2062 extends from the arcuate groove 2061 along the radial side wall of the end cover gear 206 to the other side wall until it is separated from the other side wall by the diameter of the locking buckle 203. During operation, the locking buckle 203 is inserted into the arcuate groove 2061 of the end cover gear 206. As the end cover gear 206 rotates, the groove of the hook-shaped component at the end of the locking buckle 203 engages with the protrusion in the arcuate groove 2061 of the end cover gear 206, locking the locking buckle 203. After the control source connection terminal 200 is fixed to the flaw detector body 100, the circuit control system 500 is fixed to the flaw detector body 100, and the radiation-proof housing 101 covers the control source connection terminal 200, the motor transmission device 107, and other components.

[0038] Combine Figure 8 The protective shield 202 consists of two symmetrical parts, which together form a cylindrical shape with a hollow interior. The bases of the two symmetrical parts of the protective shield 202 are rotatably connected by a rotating shaft. A semicircular hole is provided on the wall surface of the end diameter of each part of the protective shield 202. During operation, the two parts of the protective shield 202 are combined into a cylindrical shape to prevent radiation leakage. A circle of protrusions is provided on the side wall near the end of the protective shield 202. During operation, the protective shield 202 passes through the through-holes of the end cap 201. The end cap 201 moves forward from the base of the protective shield 202 and stops when it reaches the protrusion on the side wall of the protective shield 202. The protective shield 202 is then held in a cylindrical shape by the end cap 201.

[0039] Combine Figure 9 A radiation source end strong magnet 1091 is provided at one end of the radiation source 109, and a control source end strong magnet 204 is provided at the other end of the cable 207. During operation, the control source end strong magnet 204, driven by the cable 207, passes through the through-hole in the end cover gear 206, the large sealed source control end hole 1031, and the small sealed source control end hole 1021, enters the curved pipe 108, and then magnetically connects with the radiation source end strong magnet 1091. When not in operation, the cable 207 retracts the control source end strong magnet 204, which is then separated from the radiation source end strong magnet 1091, leaving the radiation source within the curved pipe 108. To facilitate magnetic attraction and separation between the control-source end strong magnet 204 and the radiation-source end strong magnet 1091, a groove is provided on the end surface of the radiation-source end strong magnet 1091 facing the end cap gear 206, and the circular diameter of this end surface is smaller than the inner diameter of the small sealed source control end hole 1021. The control-source end strong magnet 204 is spherical, and its diameter is smaller than the inner diameter of the small sealed source control end hole 1021. This structure ensures that the control-source end strong magnet 204 can enter the curved tube 108 and magnetically connect with the radiation-source end strong magnet 1091. However, when the radiation-source end strong magnet 1091 moves to the small sealed source control end hole 1021, it is blocked and separated from the control-source end strong magnet 204, remaining in the curved tube 108.

[0040] Combine Figure 10 、 Figure 11The self-locking transmission assembly 400 includes a self-locking transmission assembly housing 480 and several gears, connecting rods, quasi-gears, rocker arms, etc. disposed within the housing 480. The housing 480 is provided with a mounting hole 483 for mounting the source tube locking member 301 and for securing the source tube 302 via the locking device. The rocker arms are double rocker arms, including a first double rocker arm 451, a second double rocker arm 452, and a third double rocker arm 453. Each rocker arm includes a pivot point and rocker arms extending in two directions along the pivot point. The second double rocker arm 452 also includes a rocker arm hook 4521 extending in a third direction along the pivot point. The first gear 401 is rotatably disposed on the inner wall of the self-locking transmission assembly housing 480 and meshes with the end cap gear 206. The first bevel gear 411 is fixed to one end of the rotating shaft of the first gear 401. The second bevel gear 412 meshes with the first bevel gear 411 to change the direction of force transmission. The second bevel gear 412 is provided with an internal thread. The first threaded rod 421 is threadedly connected to the internal thread of the second bevel gear 412, converting rotation into linear motion. One end of the first connecting rod 431 is fixedly connected to the other end of the first threaded rod 421. The other end of the first connecting rod 431 is rotatably connected to the other end of the third connecting rod 433 and one rocker arm of the first double rocker arm 451 via a rotating shaft. One end of the second connecting rod 432 is rotatably connected to the inner wall of the self-locking transmission assembly housing 480. One end of the third connecting rod 433 is rotatably connected to the other end of the second connecting rod 432. The other rocker arm of the first double rocker arm 451 is rotatably connected to one end of the fourth connecting rod 434 via a rotating shaft. The rotation fulcrum of the first double rocker arm 451 is rotatably connected to the self-locking transmission assembly housing 480 via a rotating shaft. One rocker arm of the first double rocker arm 451 is connected to the self-locking transmission assembly housing 480 via a first spring 461. The other end of the fourth connecting rod 434 is rotatably connected to one rocker arm of the second double rocker arm 452 via a rotating shaft. The other rocker arm of the second double rocker arm 452 is rotationally connected to one rocker arm of the third double rocker arm 453 via a rotating shaft. The pivot point of the second double rocker arm 452 is connected to the inner wall of the self-locking transmission assembly housing 480 via an expansion nut 471. The other rocker arm of the third double rocker arm 453 is rotationally connected to the inner wall of the self-locking transmission assembly housing 480 via a rotating shaft. The pivot point of the third double rocker arm 453 is rotationally connected to one end of the fifth connecting rod 435 via a rotating shaft. The other end of the fifth connecting rod 435 is fixedly connected to one end of the second threaded rod 422. The second threaded rod 422 is threadedly connected to the second gear 402, which is rotationally connected to the inner wall of the self-locking transmission assembly housing 480 via a bearing. The second gear 402 converts linear motion into rotational motion again. The third gear 403 meshes with the second gear 402 and is rotationally connected to the inner wall of the self-locking transmission assembly housing 480. The fourth gear 404 is engaged with the third gear 403 . The fourth gear 404 is disposed at the source pipe connection end 300 to lock the source pipe connection end 300 .

[0041] Combine Figure 12 、 Figure 13 、 Figure 14 A coaxial fourth gear housing 4046 is provided on the end face of the fourth gear 404, a circle of bearings is provided on the circumferential side wall of the fourth gear housing 4046 and is rotatably connected to the inner wall of the self-locking transmission component housing 480, and a plurality of linear guide rails 4047 are provided radially on the fourth gear housing 4046. A fourth gear shaft hole 4041 is provided on the axis of the fourth gear 404, and the source tube locking member 301 is installed in the fourth gear shaft hole 4041; a plurality of arc holes 4045 are provided on the end face of the fourth gear 404, and each arc hole 4045 extends outward from a position close to the fourth gear shaft hole 4041; the guide rods 4043 are respectively located in the corresponding arc holes 4045, and a locking column 4044 is fixed at one end of each guide rod 4043; the locking columns 4044 are arranged radially along the fourth gear 404 and are located in the linear guide rail 4047, and a locking block 4042 is fixed at the end of each locking column 4044; the locking block 4042 is located in the fourth gear shaft hole 4041. In this embodiment, there are five arc-shaped holes 4045, five guide rods 4043, five locking posts 4044, five locking blocks 4042, and five linear guide rails 4047. The extended lines of the arc chords of the five arc-shaped holes 4045 intersect to form a regular pentagon. The end surface of the locking block 4042 is designed as an arc to facilitate clamping of the supply tube 302. During operation, the third gear 403 drives the fourth gear 404 to rotate, and the arc-shaped holes 4045 on the fourth gear 404 drive the guide rod 4043 to move. Because the locking post 4044 is located within the linear guide rail 4047, it can only move radially, driving the locking block 4042 to move, thereby locking or releasing the supply tube 302.

[0042] Since the gamma flaw detector involved in this embodiment is used for circumferential detection, the source tube 302 needs to move in a circle. It may become loose if it relies solely on the pin 3011 on the source tube locking member 301 and the locking member groove 1052 on the source tube cover 105. In order to prevent the source tube 302 from loosening, the locking function of the fourth gear 404 is used to ensure that the source tube 302 is stably fixed on the flaw detector body 100.

[0043] By connecting and combining the above components, when the end cover gear 206 is rotated, the fourth gear 404 at the source pipe connection end 300 can be driven to rotate through the self-locking transmission component 400, thereby completing the locking of the locking buckle 203 and the source pipe 302. Specifically, the locking buckle 203 is inserted into the arc groove 2061 of the end cover gear 206, and the end cover gear 206 rotates to lock the locking buckle 203; the end cover gear 206 drives the first gear 401 to rotate, and the first gear 401 drives the first bevel gear 411 and the second bevel gear 412 to rotate. The first bevel gear 411 and the second bevel gear 412 shift the rotation plane by 90°, and the first threaded rod 421 converts the rotational motion into a linear motion. The first connecting rod 431 drives the first double rocker arm 451 to rotate, and the first double rocker arm 451 drives the fourth connecting rod 434 to move linearly and drives the second double rocker arm 452 to rotate. The second double rocker arm 452 drives the third double rocker arm 453 to rotate and drives the fifth connecting rod 435 to move linearly. The fifth connecting rod 435 drives the second gear 402 to rotate, and the second gear 402 converts the linear motion into rotational motion. The second gear 402 drives the third gear 403 and the fourth gear 404 to rotate, and the fourth gear 404 realizes the locking of the source pipe 302.

[0044] When the end cap gear 206 rotates a small angle (e.g., a quarter turn), to achieve better power transmission, the pitch circle diameter and number of teeth of the first gear 401 can be smaller than those of the end cap gear 206, and the pitch circle diameters and numbers of teeth of the second and third gears 402, 403 can be smaller than those of the fourth gear 404. This design allows for greater displacement of the first and second threaded rods 421, 422. The two rocker arms of each double rocker arm are of equal length and have an included angle of 90°.

[0045] Combine Figure 1 、 Figure 2 、 Figure 11 To achieve the self-locking function, the self-locking transmission assembly 400 also includes a first crank 441. The center of the first crank 441 is connected to the inner wall of the self-locking transmission assembly housing 480 via an expansion nut 471. One end of the first crank 441 is connected to the inner wall of the self-locking transmission assembly housing 480 via a second spring 462. A crank hook 4411 is provided at the other end of the first crank 441. In addition, a first locking hole 481 and a second locking hole 482 are formed in the self-locking transmission assembly housing 480. The first locking hole 481 corresponds to the expansion nut 471 on the second double rocker arm 452, and the second locking hole 482 corresponds to the expansion nut 471 on the first crank 441.

[0046] Combine Figure 15The expansion nut 471 includes a fixed end 4711, a bearing end 4714, a plurality of support rods 4712, and an expansion airbag 4713. The bearing end 4714 is provided with a screw channel along the axial direction. The fixed end 4711 is rotatably connected to the inner wall of the self-locking transmission assembly housing 480. The fixed end 4711 and the bearing end 4714 are fixedly connected via a plurality of support rods 4712. The bearing end 4714 is disposed in a through hole of the first crank 441 (or the second double rocker arm 452) and is fixedly connected to the first crank 441 (or the second double rocker arm 452). The support rod 4712 is located in the through hole of the first crank 441 (or the second double rocker arm 452). The expansion airbag 4713 is annular and disposed within a fence formed by the plurality of support rods 4712. When the screw is inserted into the screw channel and the expansion airbag 4713, the expansion airbag 4713 is squeezed outward by the screw. After being squeezed by the support rod 4712, the expansion airbag 4713 partially passes through the gap between the support rods 4712 and is in close contact with the first crank 441 (or the second double rocker arm 452), so that the first crank 441 (or the second double rocker arm 452) moves with the expansion nut 471.

[0047] Before radiation, the screw is first inserted into the first locking hole 481 and connected to the expansion nut 471. The expansion nut 471 expands, keeping the expansion nut 471 stationary, and the second double rocker arm 452 is fixed and no longer rotates. Then the screw is inserted into the second locking hole 482 and the expansion airbag 4713 in the expansion nut 471 is expanded. The first crank 441 rotates with the expansion nut. The screw is rotated, and the expansion nut 471 rotates along the fixed end 4711 relative to the inner wall of the self-locking transmission component housing 480, driving the first crank 441 to rotate until the crank hook 4411 is combined with the rocker hook 4521 of the second double rocker arm 452, and the second double rocker arm 452 is fixed again. Due to the fixation of the second double rocker arm 452, the entire self-locking transmission component 400 is locked, thereby locking the locking buckle 203 and the source pipe locking member 301. After radiation, the screw in the expansion nut 471 is pulled out, and under the action of the first spring 461 and the second spring 462, the self-locking transmission component 400 is unlocked, and the locking buckle 203 and the source pipe locking piece 301 are unlocked.

[0048] The automatic control in this embodiment is embodied in the following operational process: When using the flaw detector, press and hold the power button on the circuit control system 500 for two seconds. The circuit control system 500 powers on and the device enters a self-test state. The software program checks the device's voltage, source position, and other parameters. If any problems arise, prompt troubleshooting is performed, a fault code is displayed, and an alarm sounds. After the device completes the self-test, the exposure time is set via the circuit control system 500. Pressing the exposure button allows the device to enter a delayed mode (the default setting is six seconds). This delay allows staff to quickly evacuate the site. After the delay time expires, the motor drive 107 activates, driving the small sealed source 102 to rotate. The rotation stops when the small sealed source delivery tube hole 1022 in the small sealed source 102 rotates to the large sealed source delivery tube hole 1032. The cable 207 drives the control source end strong magnet 204 to connect with the radiation source end strong magnet 1091, driving the radiation source 109 into the delivery tube 302. The device enters the exposure state, with radiation emitted from the designated position and the indicator light flashing. After the exposure time is over, the cable 207 retracts the radiation source 109, the control source end strong magnet 204 is separated from the radiation source end strong magnet 1091, the motor transmission device 107 drives the small sealed source 102 to rotate, the small sealed source source delivery tube hole 1022 is not aligned with the large sealed source source delivery tube hole 1032, and the radiation source position in the device rotates back to the shielding state.

[0049] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include," "comprise," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, the phrase "includes an element defined by..." does not exclude the presence of other identical elements in the process, method, article, or device that includes the elements.

[0050] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An automatic control type gamma flaw detector with a self-locking function, comprising a small sealed source (102), a large sealed source (103), a bent pipe (108), and a radioactive source (109) arranged in a flaw detector body (100), characterized in that: It also includes a control source connection end (200), a source pipe connection end (300), and a self-locking transmission component (400). The control source connection end (200) includes an end cover gear (206), a protective cover (202), and a hollow tube (205). The source pipe connection end (300) includes a source pipe (302). A window (104) is provided on the side wall of the flaw detector body (100). The large sealed source (103) is fixed in the flaw detector body (100). A large sealed source control end hole (1031) is provided at the end of the large sealed source (103), and a large sealed source delivery pipe hole (1032) facing the window (104) is provided on the side wall. The small sealing source (102) is rotatably disposed in the large sealing source (103). A small sealed source control end hole (1021) is provided at the end of the small sealed source (102) and a small sealed source delivery pipe hole (1022) is provided on the side wall. When the small sealed source control end hole (1021) and the large sealed source control end hole (1031) are coaxial, the small sealed source delivery pipe hole (1022) faces the large sealed source delivery pipe hole (1032). A bend pipe (108) is provided between the small sealed source control end hole (1021) and the small sealed source delivery pipe hole (1022). The radioactive source (109) is disposed in the curved pipe (108). The end cover gear (206) is rotatably mounted on the outer shell of the flaw detector body (100). The protective cover (202) is detachably mounted on the end cover gear (206). One end of the hollow tube (205) passes through the protective cover (202) and the other end is sealed and connected to the cable telescopic mechanism. The cable (207) passes through the hollow tube (205), One end of the cable (207) is connected to the cable retractor and the other end passes through the end cover gear (206), the large sealed source control end hole (1031), and the small sealed source control end hole (1021) to be detachably connected to the radioactive source (109). The source pipe (302) is connected to the elbow (108). The gamma flaw detector performs circumferential detection, and the source tube (302) needs to move in a circular motion. If the source tube (302) becomes loose, the end cover gear (206) rotates to drive the self-locking transmission component (400) to lock the source tube (302).

2. The gamma flaw detector according to claim 1, characterized in that: The self-locking transmission assembly (400) includes a self-locking transmission assembly housing (480), and a first gear (401), a bevel gear set, a first threaded rod (421), a rocker-connecting rod mechanism, a second threaded rod (422), a gear set, and a fourth gear (404) arranged in the self-locking transmission assembly housing (480), wherein The first gear (401) meshes with the end cover gear (206). The first gear (401) is connected to the first threaded rod (421) via a bevel gear set. The first threaded rod (421) is connected to the second threaded rod (422) via a rocker-connecting rod mechanism. The second threaded rod (422) is connected to the fourth gear (404) through a gear set. A mechanism for locking the source pipe locking member (301) is provided on the fourth gear (404).

3. The gamma flaw detector according to claim 2, characterized in that: The rocker-connecting rod mechanism includes a first connecting rod (431), a second connecting rod (432), a third connecting rod (433), a fourth connecting rod (434), a fifth connecting rod (435), a first double rocker arm (451), a second double rocker arm (452), and a third double rocker arm (453), wherein One end of the first connecting rod (431) is fixedly connected to the other end of the first threaded rod (421). The first rocker arm of the first double rocker arm (451) is rotatably connected to the other end of the first connecting rod (431). The first double rocker arm (451) is rotatably connected to the inner wall of the self-locking transmission component housing (480) at its rotational fulcrum. The first rocker arm end of the first double rocker arm (451) is connected to the inner wall of the self-locking transmission assembly housing (480) via a first spring (461). One end of the second connecting rod (432) is rotatably connected to the inner wall of the self-locking transmission component housing (480). One end of the third connecting rod (433) is rotatably connected to the other end of the second connecting rod (432). The other end of the third connecting rod (433) is rotatably connected to the other end of the first connecting rod (431). One end of the fourth connecting rod (434) is rotatably connected to the second rocker arm of the first double rocker arm (451). The first rocker arm of the second double rocker arm (452) is rotatably connected to the other end of the second connecting rod (432). The second double rocker arm (452) has a rotation fulcrum connected to the inner wall of the self-locking transmission assembly housing (480). The first rocker arm of the third double rocker arm (453) is rotatably connected to the second rocker arm of the second double rocker arm (452). The second rocker arm of the third double rocker arm (453) is rotatably connected to the inner wall of the self-locking transmission component housing (480). One end of the fifth connecting rod (435) is rotatably connected to the rotation fulcrum of the third double rocker arm (453). One end of the second threaded rod (422) is fixedly connected to the other end of the third connecting rod (433).

4. The gamma flaw detector according to claim 3, characterized in that: The rotation fulcrum of the second double rocker arm (452) is connected to the self-locking transmission component housing (480) through an expansion nut, and a rocker hook (4521) is provided on the second double rocker arm (452); the self-locking transmission component (400) further includes a first crank (441), one end of the first crank (441) is connected to the inner wall of the self-locking transmission component housing (480) through a second spring (462), the middle of the first crank (441) is connected to the inner wall of the self-locking transmission component housing (480) through an expansion nut, and the other end of the first crank (441) is provided with a crank hook (4411) matching the rocker hook (4521); a first locking hole (481) and a second locking hole (482) are provided on the side wall of the self-locking transmission component housing (480), the first locking hole (481) corresponds to the expansion nut of the second double rocker arm (452), and the second locking hole (482) corresponds to the expansion nut of the first crank (441).

5. The gamma flaw detector according to claim 4, characterized in that: The expansion nut includes a fixed end (4711), a bearing end (4714), an expansion airbag (4713) and a plurality of support rods (4712), wherein The fixed end (4711) is rotatably connected to the self-locking transmission assembly housing (480). The two ends of each support rod (4712) are fixedly connected to the fixed end (4711) and the bearing end (4714). The bearing end (4714) is disposed in a through hole at the rotation fulcrum of the second double rocker arm (452) or the rotation axis of the first crank (441) and is fixedly connected to the second double rocker arm (452) or the first crank (441). The inflatable airbag (4713) is annular and fixed in a fence formed by support rods (4712).

6. The gamma flaw detector according to claim 1, characterized in that: The control source connection end (200) further includes an end cover (201), The end cover (201) is put on the protective cover (202). A locking buckle (203) is fixed on the end cover (201). A hook-shaped component is provided at the end of the locking buckle (203). An arc groove (2061) is provided on the end surface of the end cover gear (206) facing the end cover (201). A protrusion (2062) is provided on the inner wall of the arc groove (2061) parallel to the axial direction of the rotation axis of the end cover gear (206). The protrusion (2062) extends from the arc groove (2061) along the radial direction of the end cover gear (206) to the other side wall until it is away from the other side wall by the diameter of the locking buckle (203). The protrusion (2062) matches the groove of the hook-shaped part of the locking buckle (203).

7. The gamma flaw detector according to claim 2, characterized in that: The mechanism for locking the source pipe locking member on the fourth gear (404) includes a fourth gear housing (4046), a plurality of locking blocks (4042), a plurality of guide rods (4043), and a plurality of locking columns (4044), wherein The fourth gear housing (4046) is fixed to the end surface of the fourth gear (404) and is rotatably connected to the inner wall of the self-locking transmission component housing (480). The fourth gear housing (4046) is provided with a plurality of linear guide rails (4047) on the inner wall perpendicular to the rotating shaft. The end surface of the fourth gear housing (4046) is provided with a number of arc-shaped holes (4045) the same as the number of the linear guide rails (4047). Each guide rod (4043) is disposed in a corresponding arc-shaped hole (4045). One end of each locking column (4044) is fixedly connected to the corresponding guide rod (4043) and moves in the corresponding linear guide rail (4047). Each locking block (4042) is fixed to the end of the corresponding locking column (4044) and is located in the fourth gear shaft hole (4041) arranged axially of the fourth gear (404). The source pipe locking member (301) is disposed in the fourth gear shaft hole (4041).

8. The gamma flaw detector according to claim 7, characterized in that: Five arc-shaped holes (4045) are provided, each arc-shaped hole (4045) extends outward from a position close to the fourth gear shaft hole (4041), and the extended lines of the arc chords of the five arc-shaped holes (4045) intersect and form a regular pentagon.

9. The gamma flaw detector according to claim 1, characterized in that: A radiation source end strong magnet (1091) is provided at one end of the radiation source (109), and a control source end strong magnet (204) is provided at the other end of the cable (207). The radiation source end strong magnet (1091) and the control source end strong magnet (204) are matched and connected. The diameter of the small sealed source control end hole (1021) is smaller than the diameter of the radiation source end strong magnet (1091) and larger than the diameter of the control source end strong magnet (204).

10. The gamma flaw detector according to claim 1, characterized in that: The rotation axis of the small sealing source (102) is collinear with the axis of the small sealing source (102), the control end hole (1021) of the small sealing source is an eccentric hole, and the control end hole (1031) of the large sealing source is an eccentric hole.

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