Post insulator electrified ultrasonic detection equipment and detection method

Abstract

The invention discloses post insulator electrified ultrasonic detection equipment and a detection method, the post insulator electrified ultrasonic detection equipment comprises a supporting seat and a swing frame arranged at the top of the supporting seat, the swing frame comprises a rectangular central shell, the two ends of the central shell are rotatably connected with driving screw rods, and the two driving screw rods are in transmission connection with a transmission belt through transmission wheels; the second motor drives any driving screw rod to rotate, and the two driving screw rods are in threaded connection with the two sides of the bearing plate; a detection ring frame is arranged on the bearing plate, a plurality of guide frames are evenly arranged on the first ring plate, each guide frame comprises a connecting cylinder, a push column and a spring, the connecting cylinders are fixed to the inner wall of the first ring plate, the push columns are slidably connected into the connecting cylinders, the springs are arranged between the push columns and the inner walls of the connecting cylinders, and the ends of the push columns extend out of the connecting cylinders and are fixedly connected with arc-shaped frames; and the arc-shaped frame can be coupled with the post insulator. The problem that in the prior art, supporting column detection equipment cannot adapt to ultrasonic detection of supporting column insulators with different inclination angles is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power equipment detection, and particularly relates to a kind of support insulator live ultrasonic detection equipment and detection method. BACKGROUND

[0002] In the electrical system of power grid and power plant, support porcelain insulator and porcelain sleeve as the core support and insulation components, its operation reliability is directly related to the safe and stable and economic operation of power grid. However, such components are prone to mechanical stress impact during installation, construction, routine maintenance and repair process, and are exposed to outdoor harsh environment for a long time (such as high and low temperature alternation, rain and snow erosion, wind and sand abrasion, etc.), and improper gluing process may cause initial cracks on the surface and near-surface of porcelain body in cast iron flange due to excessive expansion stress. These factors will all cause the gradual expansion of internal micro-defects and damage, and eventually may lead to component failure and fracture, which brings serious safety hazards to power grid operation. Therefore, accurate and comprehensive defect detection and quality evaluation of in-service support porcelain insulator and porcelain sleeve become the key link to ensure the reliable operation of power system. Ultrasonic detection technology has been widely recognized as an effective means for defect detection of support porcelain insulator and porcelain sleeve due to its high sensitivity to internal defects. A-scan technology can convert the reflected echo into one-dimensional time domain signal by emitting pulse sound wave and receiving reflected echo, and can judge the size of defect or interface reflection intensity according to the echo amplitude, and calculate the distance of defect from the surface according to the sound wave propagation time, which provides quantitative basis for defect detection. In the practical application of A-scan technology, creeping wave and small-angle longitudinal wave are two types of core waveforms that are paid special attention to: as a special longitudinal wave detection method, creeping wave is incident on the surface of solid medium slightly smaller than the first critical angle, and the energy is concentrated in the range of several wavelengths below the surface, which is sensitive to surface and near-surface cracks, interlayer and other defects, and can effectively avoid the missed detection problem caused by poor surface coupling or blind area in conventional longitudinal wave or transverse wave detection; small-angle longitudinal wave technology controls the incidence angle of longitudinal wave by special oblique probe, so that the longitudinal wave propagates in the detected material at a small angle, and uses the refracted longitudinal wave near the first critical angle to realize defect detection, and the complementary application of the two technologies provides technical support for defect coverage detection. Although the ultrasonic detection technology can meet the demand of the detection of the defects of the post insulator and the porcelain sleeve in principle, the installation environment of the post insulator in the power grid and the power plant is complex, and is affected by the installation position, the construction precision, the mechanical deformation in the long-term operation and other factors, the tilt directions of different post insulators are obviously different, and some posts even present irregular tilt state. The current mainstream ultrasonic detection equipment is designed with fixed angle, and the installation posture and the detection angle of the probe cannot be flexibly adjusted according to the actual tilt direction of the post insulator: when the detection tilt direction does not match the preset angle of the equipment, the propagation path of the creeping wave and the small-angle longitudinal wave deviates from the ideal detection track, which leads to the decline of the sound wave coupling effect, the weakening or distortion of the defect reflection echo signal, and the detection result cannot accurately capture the subtle defects on the surface and near the surface, and the deep defect hidden danger may be missed due to the detection blind area; at the same time, the detection equipment with fixed angle cannot adapt to the detection requirements of the post insulator with different tilt degrees and different installation postures, which leads to obvious coverage blind area in the detection process, and cannot realize the comprehensive detection of the post insulator in full surface and full dimension, which affects the accuracy and integrity of the detection result. SUMMARY

[0003] The purpose of the present application is to solve the problem that the existing post detection equipment cannot adapt to the ultrasonic detection of post insulators with different tilt angles, and to provide a post insulator live ultrasonic detection equipment and a detection method.

[0004] In order to solve the above technical problems, the technical scheme adopted by the present application is as follows: a post insulator live ultrasonic detection equipment, comprising a support seat and a swing frame arranged on the top of the support seat, the swing frame comprises a rectangular center shell, drive screws are rotatably connected to both ends of the center shell, the two drive screws are drivingly connected through a transmission belt and a transmission wheel, and a second motor drives any one of the drive screws to rotate, and the two drive screws are threadedly connected to both sides of a bearing plate; A detection ring frame is arranged on the bearing plate, the detection ring frame comprises a transmission seat arranged on the bearing plate, a first ring plate is fixedly connected to the top of the transmission seat, a rotary gear ring is arranged between the first ring plate and the transmission seat, the transmission seat, the first ring plate and the rotary gear ring are all arranged in a C-shaped structure, the rotary gear ring is driven by a power source arranged on the transmission seat, the movement track of the rotary gear ring is limited by a guide roller arranged on the transmission seat, and a detection probe is fixedly arranged on the rotary gear ring; A plurality of guide frames are uniformly arranged on the first ring plate, the guide frame comprises a connecting cylinder, a push column and a spring, the connecting cylinder is fixed to the inner wall of the first ring plate, the push column is slidingly connected in the connecting cylinder, the spring is arranged between the push column and the inner wall of the connecting cylinder, the end of the push column extends out of the connecting cylinder and is fixedly connected with an arc-shaped frame, the area of the arc-shaped frame is greater than the gap between two adjacent insulators of the post insulator, and the arc-shaped frame can be coupled with the post insulator.

[0005] As a further optimization of the charged ultrasonic detection equipment for a support insulator of the application, the bearing plate and the transmission seat are connected together through a fine adjustment truss, the fine adjustment truss comprises a second adjusting frame arranged on the bearing plate and a transmission block connected together with the transmission seat, the transmission block is driven by the first adjusting frame, and the second adjusting frame drives the first adjusting frame.

[0006] As a further optimization of the charged ultrasonic detection equipment for a support insulator of the application, the center shell and the top of the support seat are connected together through a translation frame, the translation frame comprises a sliding rail, a sliding block, a control screw and a first motor, the sliding rail is fixedly connected with the top of the support seat, the sliding block is slidingly connected in the sliding rail and is fixedly connected with the center shell, the control screw is rotatably arranged in the sliding rail and is threadedly connected with the sliding block, and the first motor is arranged on the sliding rail and can drive the control screw to rotate.

[0007] As a further optimization of the charged ultrasonic detection equipment for a support insulator of the application, the support seat comprises an extension rod, an energy source body and a stabilizing frame, the fixed end bottom of the extension rod is connected with the energy source body, the stabilizing frame is fixed to the outer periphery of the extension rod, the stabilizing frame is composed of three triangular plates, and universal wheels are arranged at the top corners of the stabilizing frame.

[0008] As a further optimization of the charged ultrasonic detection equipment for a support insulator of the application, the extension rod is provided with a positioning clamp, the positioning clamp comprises a connecting hoop, an extension rod and a top pressing clamp, the connecting hoop is fixedly connected with the extension rod, and the extension rod is fixedly connected with the connecting hoop and the top pressing clamp through screws at both ends.

[0009] As a further optimization of the charged ultrasonic detection equipment for a support insulator of the application, the bearing plate is fixedly connected with a buffer block, and the buffer block can be clamped with the center shell.

[0010] As a further optimization of the charged ultrasonic detection equipment for a support insulator of the application, the rotating gear ring and the detection probe are connected together through an L-shaped connecting frame, and a first camera is fixedly connected at the top end of the vertical section of the L-shaped connecting frame.

[0011] As a further optimization of the charged ultrasonic detection equipment for a support insulator of the application, the power source comprises two drive columns rotatably arranged on the transmission seat, the two drive columns are driven by a synchronous belt at one end of the transmission seat, and any drive column is driven by a third motor, and the drive column is fixedly connected with a drive gear meshing with the rotating gear ring at one end of the transmission seat.

[0012] As a further optimization of the charged ultrasonic detection equipment for a support insulator of the application, the guide roller comprises an inner roller and an outer pressing roller arranged on the transmission seat, the cross section of the inner roller is V-shaped, the recess of the inner roller is rotatably connected with the inner wall of the rotating gear ring, and the outer pressing roller is a rubber wheel pressed on the upper and lower sides of the rotating gear ring.

[0013] A kind of support insulator live ultrasonic detection method, comprising the following steps: S1, by universal wheel mobile device to target position, and utilize positioning clamp to press the fixed equipment of steel frame; S2, by swing frame lateral displacement of translation frame drive, make detection ring frame align the support insulator to be detected; S3, utilize fine adjustment truss fine adjustment detection ring frame transverse and longitudinal position, and make the arc-shaped frame of guide frame adhere to the surface of support insulator, and cooperate swing frame to make detection ring frame overturn to the position of the inclination angle of adaptation support insulator, and make detection ring frame move along the length direction of support insulator; S4, detection ring frame rotates during movement, to make detection probe included in detection ring frame emit ultrasonic wave, carry out defect detection in combination with A scanning technique, creeping wave technique and small-angle longitudinal wave technique.

[0014] Compared with prior art, the present application has the following beneficial effects: The present application is provided with the telescopic adjustment function of support seat, the balance calibration function of stabilizer and the flexible fixing function of positioning clamp, combined with the multi-angle overturning design of swing frame, the lateral displacement design of translation frame and the coupling structure of guide frame and support insulator, so that swing frame can realize swing tilting action along the length direction of support insulator to be detected, so that the equipment can adapt to support insulator with different installation height, different inclination direction and different position, to a certain extent, solve the problem of angle fixation and narrow adaptation range of traditional detection equipment, realize comprehensive coverage detection of support insulator under complex working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the schematic diagram of the shaft side structure of the present application; Figure 2 It is the schematic diagram of the overhead structure of the present application; Figure 3 It is the schematic diagram of the D-D section structure of the present application; Figure 4 It is the schematic diagram of the local enlarged structure of the present application; Figure 5 It is the schematic diagram of the front view structure of the present application; Figure 6 It is the schematic diagram of the side view structure of the present application; Figure 7 It is the schematic diagram of the rear view structure of the present application; Marked in the figure: 1, support seat; 101, universal wheel; 102, balance column; 103, stabilizing frame; 104, energy main body; 105, telescopic rod; 2, positioning clamp; 201, connecting hoop; 202, extension rod; 203, top pressing clamp; 3, translation frame; 301, sliding rail; 302, first motor; 303, sliding block; 304, control screw; 4, swing frame; 401, center shell; 402, bearing plate; 403, drive screw; 404, auxiliary column; 405, buffer block; 406, second motor; 407, transmission wheel; 408, transmission belt; 5, fine adjustment truss; 501, first adjusting frame; 502, transmission block; 503, second adjusting frame; 6, detection ring frame; 601, first ring plate; 602, rotating tooth ring; 603, drive gear; 604, guide roller; 6041, inner roller; 6042, outer pressing wheel; 605, transmission seat; 606, L connecting frame; 607, first camera; 608, detection probe; 609, synchronous belt; 7, guide frame; 701, reinforcing rib; 702, connecting barrel; 703, push column; 704, arc-shaped frame; 705, spring; 8, control main body; 9, second camera. DETAILED DESCRIPTION

[0016] In order to better understand the present application, the content of the present application is further illustrated below in combination with examples, but the content of the present application is not limited to the following examples.

[0017] As Figure 1 , Figure 2 , Figure 5 , Figure 6 and Figure 7 indicated, a kind of post insulator live ultrasonic detection equipment, through the coordination of linkage of support seat 1, translation frame 3, swing frame 4, fine adjustment truss 5 and detection ring frame 6, in combination with ultrasonic A scanning core technology and wave climbing, small-angle longitudinal wave special detection technology, realize the comprehensive coverage detection of post insulator in different tilt directions, different installation positions. Each component is cooperated by mechanical transmission and electric control system, solve the pain points of traditional detection equipment angle fixed, poor adaptability, many detection blind areas, ensure that in live working scene, both can flexibly adjust posture and adapt to complex working conditions, can also capture the surface and internal defects of insulator by high-precision ultrasonic detection, provide reliable technical support for power grid safe operation.

[0018] The support base 1 is the bearing and positioning center of the whole device, which ensures the stability of the detection process of the post insulator. The support base 1 includes an electric push rod as a telescopic rod 105 with an electrically controllable telescopic amount, and the telescopic rod 105 is fixedly connected to the bottom of the energy source body 104. The energy source body 104 is an integrated shell with a built-in battery and an electric control structure, which not only provides continuous power for the telescopic rod 105, the detection ring frame 6 and each drive motor, but also simplifies the device layout through integrated design, and assists in maintaining the vertical stability of the telescopic rod 105. The telescopic rod 105 can flexibly adjust the telescopic amount according to the installation height of the post insulator, and adapt to the detection needs of different heights. The telescopic rod 105 is fixedly connected to the outer periphery of the stabilizing frame 103 composed of three triangular plates, which improves the overall structural strength of the device by using the stability principle of the triangle. The universal wheel 101 at the top corner of the stabilizing frame 103 can assist the operator to move the device flexibly, and realize the detection coverage of the post insulator at different positions. At the same time, the three bottom edges of the stabilizing frame 103 are screw-connected with the balance column 102, and the screw rod with the bottom pad can adjust the height of the pad by rotating. After the device is moved to the target position, the verticality of the telescopic rod 105 can be quickly calibrated to avoid detection deviation caused by uneven ground.

[0019] The telescopic rod 105 is provided with a positioning clamp 2 at the top of the fixed segment, which is used to press the steel frame holding the post insulator with the top pressing clamp 203 after the telescopic rod 105 is adjusted in place, further limiting the verticality of the telescopic rod 105. The positioning clamp 2 is fixedly connected to the telescopic rod 105 through the connecting hoop 201, and is extended to the top pressing clamp 203 through the extension rod 202. The length of the extension rod 202 and the angle of the top pressing clamp 203 can be adjusted through the screw, which is suitable for different specifications of steel frame structure, and ensures the stable detection posture of the detection ring frame 6 to the post insulator.

[0020] As shown in Figure 3 and Figure 4 , the cooperative work of the translation frame 3 and the swing frame 4 can realize the lateral displacement and multi-angle inclination adjustment of the detection ring frame 6, thereby solving the problem that the traditional detection structure cannot adapt to the post insulator with different inclination directions. The translation frame 3 includes a sliding rail 301 fixedly connected to the telescopic end of the telescopic rod 105, a sliding block 303 slidably connected in the sliding rail 301 and rigidly connected with the swing frame 4, and a screw rod 304 driven and controlled by a first motor 302 to rotate the sliding block 303 along the sliding rail 301. The first motor 302 is a stepping motor so that the operator can control the rotation amount of the first motor 302 to realize the lateral displacement of the swing frame 4, so that the detection ring frame 6 can be aligned with the multiple post insulators uniformly distributed on the top of the steel frame in sequence, without the need to move the whole device to complete multi-target detection, thereby improving the detection efficiency.

[0021] The swing frame 4 comprises a hollow shell in the shape of a rectangle, both ends of which are rotatably connected with driving screws 403, and the two driving screws 403 are synchronously driven through transmission wheels 407 and a transmission belt 408, and any driving screw 403 is driven to rotate by a second motor 406; the driving screw 403 is threadedly connected with a bearing plate 402, and both sides of the bearing plate 402 are provided with auxiliary columns 404 which are rotatably connected with the central shell 401, the auxiliary columns 404 can play a guiding and stabilizing role, when the driving screw 403 rotates, the bearing plate 402 can be driven to vertically displace while being turned to different angles, thereby realizing the adjustment of the inclination angle of the detection ring frame 6, and adapting to the support insulator in different inclination directions. The bottom of the bearing plate 402 is fixedly connected with a buffer block 405 which can be clamped with the center, thereby positioning the initial position of the bearing plate 402.

[0022] The fine adjustment truss 5 comprises a second adjusting frame 503 fixed on the bearing plate 402, the second adjusting frame 503 drives a first adjusting frame 501, the first adjusting frame 501 drives a transmission block 502, the transmission block 502 can drive the detection ring frame 6 connected with the transmission block 502 to horizontally and vertically displace through the cooperative action of the first adjusting frame 501 and the second adjusting frame 503, thereby realizing the fine adjustment of the position of the detection ring frame 6. The fine adjustment truss 5 can correct the slight deviation of the translation frame 3 and the swing frame 4 after adjustment, and ensure that the support insulator to be detected is accurately located at the center of the detection ring frame 6, thereby providing a guarantee for the effectiveness of ultrasonic detection. The fine adjustment truss 5 can cooperate with the positioning of the buffer block 405 to make the transmission seat 605, the first ring plate 601 and the rotating gear ring included in the detection ring frame 6 fit to the support insulator, and make the support insulator approximately located at the center of the transmission seat 605, the first ring plate 601 and the rotating gear ring, so that the detection ring frame 6 rotates around the support insulator and displaces along the length direction of the support insulator, thereby stably and comprehensively performing the ultrasonic detection on the support insulator.

[0023] The detection ring frame 6 is a core execution component for realizing ultrasonic detection. The detection ring frame 6 adopts a C-shaped structure design. Specifically, the detection ring frame 6 includes a first ring plate 601, a rotating tooth ring 602 and a transmission seat 605, all of which are C-shaped. Thus, the first ring plate 601 and the rotating tooth ring 602 can be sleeved on the support insulator without disassembling the equipment. The transmission seat 605 is provided with a third motor. The third motor drives two drive columns rotatingly arranged on the transmission seat 605 through a synchronous belt 609. The top of the drive column penetrates through the transmission seat 605 and is fixedly connected with a drive gear 603. The drive gear 603 is engaged with the rotating tooth ring 602, so as to drive the rotating tooth ring 602 to rotate around the first ring plate 601. The rotating tooth ring 602 is limited and guided by guide rollers 604 arranged on the first ring plate 601 to ensure the rotating stability of the rotating tooth ring 602. In the rotating process of the rotating tooth ring 602, the synchronous belt 609 drives an L-shaped connecting frame 606 on the rotating tooth ring 602 to rotate with the rotating tooth ring 602, so as to make a detection probe 608 arranged on the L-shaped connecting frame 606 and a first camera 607 rotate around the support insulator to realize no dead angle detection. The guide rollers 604 include a plurality of outer pressing wheels 6042 and a plurality of inner rollers 6041. The cross section of the inner roller 6041 is V-shaped, and the recess of the inner roller 6041 is rotationally connected with the inner wall of the rotating tooth ring 602. The outer pressing wheel 6042 is a rubber wheel pressed on the upper and lower sides of the rotating tooth ring 602. Thus, the rotating tooth ring 602 can stably rotate around the center of the transmission seat 605, so as to drive the detection probe 608 and the first camera 607 to rotate around the support insulator to perform ultrasonic detection on the support insulator.

[0024] Specifically, the detection probe 608 can emit pulsed acoustic waves, and when the acoustic waves propagate inside the post insulator, they will produce reflected echoes when encountering defects or medium interfaces; the probe converts the echoes into a one-dimensional time domain signal after receiving the echoes, with the horizontal axis being the time sound path and the vertical axis being the echo amplitude. Through the calculation of the sound path and the sound propagation speed, the acoustic waves need to propagate back and forth, and the distance of the defect from the surface can be accurately located; the strength of the echo amplitude directly reflects the size of the defect or the interface reflection strength. The higher the amplitude, the stronger the defect or bottom reflection, combined with the typical peak waveform characteristics, the qualitative analysis of the defect is realized. As a special form of longitudinal wave detection, the detection probe 608 can generate surface longitudinal waves, i.e. creeping waves, by incidenting acoustic waves at an angle slightly smaller than the first critical angle on the surface of the insulator. The energy of the creeping waves is mainly concentrated in the surface within a few wavelengths, usually ≤10 mm, and propagates along the surface in parallel. The detection probe 608 has extremely high sensitivity to surface and near-surface defects of the post insulator, such as flange porcelain body cracks caused by improper gluing process and surface cracks caused by wind and sand abrasion, which can effectively avoid the missed detection problem caused by poor surface coupling or blind area in conventional longitudinal and transverse wave detection. The elastic fitting design of the detection probe 608 in cooperation with the guide frame 7 ensures stable coupling of the probe and the surface of the insulator, reduces the influence of surface roughness on the propagation of the creeping wave, and improves the detection accuracy of shallow defects. The small-angle longitudinal wave special technology adopts a specially-made small-angle longitudinal wave probe, which controls the longitudinal wave incident angle near the first critical angle through a wedge, so that the acoustic wave propagates inside the insulator at a small angle. At this time, there are refracted longitudinal waves and transverse waves in the medium, and the small-angle longitudinal wave is used. This makes the detection probe 608 able to reduce the influence of defect orientation on detection, especially for the detection of deep defects such as closed cracks and internal fine layers, which has outstanding detection effect. It is suitable for internal damage expansion of post insulators due to long-term operation. Combined with the full-circle rotation and multi-angle tilt adjustment of the detection ring frame 6, it can ensure that the small-angle longitudinal wave can incident on the defect from different directions, further improving the defect recognition rate. The collaborative application of the three technologies enables the device to capture surface and near-surface defects through creeping waves, detect deep defects through small-angle longitudinal waves, and realize accurate positioning and qualitative analysis of defects through A-scan technology, forming a full-scene defect detection capability, and perfectly adapting to the detection needs of post insulators with different inclination angles and different defect types.

[0025] Three guide frames 7 are uniformly distributed on the inner wall of the first ring plate 601. The guide frame 7 comprises a connecting cylinder 702 fixedly connected with the inner wall of the first ring plate 601, and a reinforcing rib 701 connected between the connecting cylinder 702 and the upper and lower sides of the first ring plate 601. A push column 703 is slidably arranged in the connecting cylinder 702. A spring 705 between the push column 703 and the inner wall of the connecting cylinder 702 provides elastic pressing force, so that the arc-shaped frame 704 fixedly arranged at the end of the push column 703 tightly contacts the surface of the post insulator. The area of the arc-shaped frame 704 is larger than the gap between two adjacent insulators of the post insulator, which not only ensures the guiding stability when the detection ring frame 6 moves along the length direction of the post insulator, but also compensates the deviation caused by the inclination or irregular surface of the post insulator through elastic self-adaptive adjustment, so as to ensure the coupling effect between the detection probe 608 and the surface of the insulator. The second camera 9 arranged at the edge of the transmission seat 605 cooperates with the control body 8. The control body 8 is internally provided with a wireless transmission module, which can transmit the real-time pictures of the insulator surface details shot by the first camera 607 and the equipment operation posture shot by the second camera 9 to the display screen of the ground controller, so as to facilitate the remote observation and adjustment of the operation personnel and improve the detection safety and accuracy. The specific embodiments of the application are described above. It should be understood that the application is not limited to the above specific embodiments, and various modifications or changes can be made by those skilled in the art within the scope of the claims, which does not affect the essential content of the application.

Claims

1. A live-line ultrasonic testing apparatus for a post insulator, characterized by: Including support seat (1) and be located in support seat (1) top swing frame (4), swing frame (4) includes rectangular center shell (401), both ends of center shell (401) are rotatably connected with drive screw (403), two drive screws (403) are drivenly connected through transmission wheel (407) and transmission belt (408), second motor (406) drives any drive screw (403) to rotate, and two drive screws (403) are screw connected with both sides of bearing plate (402); The bearing plate (402) is provided with a detection ring frame (6), the detection ring frame (6) includes a transmission seat (605) arranged on the bearing plate (402), the transmission seat (605) is fixedly connected with a first ring plate (601) on the top, a rotating gear ring (602) is arranged between the transmission seat (605) and the first ring plate (601), the transmission seat (605), the first ring plate (601) and the rotating gear ring (602) are all arranged in a C-shaped structure, the rotating gear ring (602) is driven by a power source arranged on the transmission seat (605), the rotating gear ring (602) is limited in its movement track by a guide roller (604) arranged on the transmission seat (605), and a detection probe (608) is fixedly arranged on the rotating gear ring (602); A plurality of guide frames (7) are uniformly arranged on the first ring plate (601), the guide frame (7) includes a connecting cylinder (702), a push column (703) and a spring (705), the connecting cylinder (702) is fixedly arranged on the inner wall of the first ring plate (601), the push column (703) is slidably connected in the connecting cylinder (702), the spring (705) is arranged between the push column (703) and the inner wall of the connecting cylinder (702), the end of the push column (703) extends out of the connecting cylinder (702) and is fixedly connected with an arc-shaped frame (704), the area of the arc-shaped frame (704) is greater than the gap between the adjacent two insulators of the post insulator, and the arc-shaped frame (704) can be coupled with the post insulator.

2. A live-line ultrasonic testing apparatus for a post insulator as claimed in claim 1, characterized in that: The bearing plate (402) and the transmission seat (605) are connected together through a fine adjustment truss (5), the fine adjustment truss (5) includes a second adjusting frame (503) arranged on the bearing plate (402) and a transmission block (502) connected together with the transmission seat (605), the transmission block (502) is driven by a first adjusting frame (501), and the second adjusting frame (503) drives the first adjusting frame (501).

3. A live-line ultrasonic testing apparatus for a post insulator as claimed in claim 1, wherein: The center shell (401) and the top of the support seat (1) are connected together through a translation frame (3), the translation frame (3) includes a sliding rail (301), a sliding block (303), a control screw (304) and a first motor (302), the sliding rail (301) is fixedly connected with the top of the support seat (1), the sliding block (303) is slidably connected in the sliding rail (301) and is fixedly connected with the center shell (401), the control screw (304) is rotatably arranged in the sliding rail (301) and is screwedly connected with the sliding block (303), and the first motor (302) is arranged on the sliding rail (301) and can drive the control screw (304) to rotate.

4. A live-line ultrasonic testing apparatus for a post insulator as claimed in claim 1, wherein: The support seat (1) comprises a telescopic rod (105), an energy source body (104) and a stabilizing frame (103), the telescopic rod (105) is connected with the energy source body (104) at the bottom of the fixed end, the stabilizing frame (103) is fixed on the outer periphery of the telescopic rod (105), the stabilizing frame (103) is composed of three triangular plates, and universal wheels (101) are arranged at the top corners of the stabilizing frame (103).

5. A live-line ultrasonic testing apparatus for a post insulator as claimed in claim 4, characterized in that: The telescopic rod (105) is provided with a positioning clamp (2), the positioning clamp (2) comprises a connecting hoop (201), an extension rod (202) and a pressing clamp (203), the connecting hoop (201) is fixedly connected with the telescopic rod (105), and the extension rod (202) is fixedly connected with the connecting hoop (201) and the pressing clamp (203) through screws at two ends.

6. A live-line ultrasonic testing apparatus for a post insulator as claimed in claim 1, wherein: The bearing plate (402) is fixedly connected with a buffer block (405), and the buffer block (405) can be clamped with the center shell (401).

7. A live-line ultrasonic testing apparatus for a post insulator as claimed in claim 1, wherein: The rotating tooth ring (602) and the detection probe (608) are connected through the L-shaped bracket (606), and the vertical section of the L-shaped bracket (606) is fixedly connected with the first camera (607) at the top end.

8. A live-line ultrasonic testing apparatus for a post insulator as claimed in claim 1, wherein: The power source comprises two driving columns rotatably arranged on the transmission seat (605), the two driving columns are arranged at one end of the transmission seat (605) and are driven through a synchronous belt (609), any one driving column is driven by a third motor, and one end of the driving column extending out of the transmission seat (605) is fixedly connected with a driving gear (603) engaged with the rotating tooth ring (602).

9. A live-line ultrasonic testing apparatus for a post insulator as claimed in claim 1, wherein: The guide roller (604) comprises an inner roller (6041) and an outer pressing roller (6042) arranged on the transmission seat (605), the cross section of the inner roller (6041) is V-shaped, the recessed part of the inner roller (6041) is rotatably connected with the inner wall of the rotating tooth ring (602), and the outer pressing roller (6042) is a rubber roller covering the upper and lower side surfaces of the rotating tooth ring (602).

10. A method of live ultrasonic testing of a post insulator, characterized by: The steps of using the column insulator live-line ultrasonic detection equipment of any one of claims 1-9 are as follows: S1, moving the equipment to the target position through the universal wheels (101), and fixing the equipment by pressing the steel frame with the positioning clamp (2); S2, driving the swing frame (4) to move horizontally through the translation frame (3), so that the detection ring frame (6) is aligned with the column insulator to be detected; S3, finely adjusting the horizontal and vertical positions of the detection ring frame (6) by using the fine adjustment truss (5), and making the arc-shaped frame (704) of the guide frame (7) adhere to the surface of the column insulator, and cooperating with the swing frame (4) to make the detection ring frame (6) flip to the position suitable for the inclination angle of the column insulator, and making the detection ring frame (6) move along the length direction of the column insulator; S4, during the movement of the detection ring frame (6), self-rotating to make the detection probe (608) included in the detection ring frame (6) emit ultrasonic waves, and combining A-scan technology, creeping wave technology and small-angle longitudinal wave technology to detect defects.

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