Insulator interface residual stress nondestructive flaw detection device

Abstract

This invention belongs to the field of insulator flaw detection technology, specifically a non-destructive testing device for residual stress at insulator interfaces. Addressing the problem of low detection efficiency in existing technologies where manual adjustment of the flaw detector's irradiation position is required for precise detection, the invention proposes the following solution: It includes two symmetrical convex support frames. Two horizontal and parallel rubber rollers are respectively installed between the shoulders of the two convex support frames. A vertical rod is fixed to the center of the top of each of the two convex support frames. A common crossbeam pressure rod is slidably connected between the tops of the two convex support frames. This invention allows for physical inspection of the surface before ultrasonic testing. Once a dimensional deviation or surface defect is detected, the position information is transmitted to an electric slider, which then drives the ultrasonic testing equipment to the defect location for precise non-destructive testing of internal residual stress, thereby improving detection efficiency.

Description

Technical Field

[0001] This invention relates to the field of insulator flaw detection technology, and in particular to a non-destructive testing device for residual stress at insulator interfaces. Background Technology

[0002] Insulators are critical foundational components of high-voltage power transmission systems, and their manufacturing quality directly determines the safety and stability of the power grid operation. After insulator production, hidden defects such as porosity, microcracks, and delamination can easily exist internally. If these defects are not thoroughly detected and removed, they can easily lead to insulation failure and line faults after the insulators are put into operation and maintenance. Currently, traditional insulator factory inspections mostly employ methods such as manual tapping screening, offline sampling flaw detection, and destructive testing. These methods have low accuracy, high missed detection rates, and the batch offline testing and destructive sampling methods are energy-intensive and consume a lot of materials, which does not meet the requirements of green and low-carbon production development in the manufacturing industry.

[0003] Traditional factory testing equipment requires comprehensive inspection of the entire insulator, resulting in low production efficiency. Destructive testing also leads to waste of finished products, increases carbon emissions and production costs, and hinders the large-scale, high-quality production of insulators. To address these technical shortcomings, the industry urgently needs efficient, low-consumption, and accurate intelligent testing equipment.

[0004] Based on this, online non-destructive testing instruments adapted to insulator production lines have emerged. This equipment can be integrated with production lines to achieve precise location-based flaw detection and non-destructive batch testing of insulators, accurately identifying hidden internal defects and replacing traditional manual and destructive testing methods. Its fully automated testing mode significantly improves the efficiency and pass rate of factory quality inspection, effectively reducing resource waste caused by product scrap and reprocessing, lowering production energy consumption and carbon emissions, and meeting the green, low-carbon, and intelligent production development needs of the power manufacturing industry while ensuring the quality of insulators leaving the factory. Summary of the Invention

[0005] To overcome the problem of low detection efficiency caused by the need for manual adjustment of the flaw detector's irradiation position for accurate detection during insulator flaw detection in existing technologies, the present invention aims to provide a non-destructive testing device for residual stress at insulator interfaces: This invention provides a non-destructive testing device for residual stress at the interface of an insulator, comprising two symmetrical convex support frames. Two horizontal and parallel rubber rollers are respectively installed between the shoulders of the two convex support frames. The overall length of the rubber rollers is greater than the length of the insulator body under test, and the distance between the two rubber rollers is less than the diameter of the insulator body, ensuring that the insulator body is contained within them. A vertical rod is fixed to the middle of the top of each of the two convex support frames. A common crossbeam pressure rod is slidably connected between the top ends of the two convex support frames, and the lower surface of the crossbeam pressure rod is located on the insulator. A drive device and an auxiliary drive device are respectively installed at the top of both ends of the main body, which can drive the insulator body placed on two rubber rollers to rotate slowly for pre-inspection or ultrasonic flaw detection; multiple U-shaped notches are opened in the middle area of ​​the side of the crossbeam pressure rod, and a pre-inspection device is installed in each U-shaped notch. The pre-inspection device includes a probe rod extending vertically downward; a slide rail is fixed between the two convex support frames below the rubber rollers, and an electric slider is slidably connected on the slide rail. An ultrasonic flaw detection device with the shooting direction facing upward is installed on the side of the electric slider.

[0006] Furthermore, the U-shaped notch extends through both the upper and lower sides of the crossbeam pressure bar, and a top abutment block is fixed at the top of the U-shaped notch near the bottom of the groove. An arc-shaped groove is reserved on the side of the top abutment block near the bottom of the U-shaped notch groove. The probe rod is slidably connected between the arc-shaped groove and the bottom of the U-shaped notch groove, and an anti-fall block is fixed at the top of the probe rod. A bottom slider is provided at the opening of the U-shaped notch near the bottom, which slides horizontally towards the bottom of the U-shaped notch groove. An arc-shaped groove is provided on the side of the bottom slider near the probe rod, and the arc-shaped groove has the same diameter as the arc-shaped groove. A guide rail is fixed at the opening of the U-shaped notch to constrain the sliding of the bottom slider. The ends of the four guide rails away from the probe rod are fixed with the same connecting baffle. A pressure sensor is embedded in the middle of the connecting baffle. A protrusion is fixed in the middle of the upper surface of the bottom slider. A compression spring is fixed between the protrusion and the connecting baffle. The bottom slider does not contact the pressure sensor when it is not subjected to lateral thrust.

[0007] Furthermore, an outer cover plate is fixed to the front and top corner of the crossbeam pressure bar near the U-shaped notch, and an indicator light is fixed to the upper surface of the outer cover plate. The control terminal of the indicator light is connected to a processor via a signal line, and the signal output terminal of the pressure sensor is connected to the processor via a signal line. With this setting, the defect location can be quickly displayed in the form of sound and light, so that the staff can make special markings.

[0008] Further, the outer wall of the detection rod close to the two ends of the beam pressing rod and above the beam pressing rod is also clamped with a positioning clamping rod, the positioning clamping rod is made of ductile material, the cross section of the positioning clamping rod is C-shaped structure, the number of the positioning clamping rod is matched with the length of the insulator body, the inner diameter of the positioning clamping rod is smaller than the diameter of the falling prevention block, the overall length of the insulator body can be locked by the pre-detection device within a certain range during detection, so that the device can adapt to more specifications of the insulator body.

[0009] Further, the detection rod is made of ductile metal material, and the tips of two adjacent detection rods will also connect the alarm circuit one after touching, when the rotating insulator body is physically detected, once the insulator body disc is detected to be skewed, the alarm circuit one will be triggered.

[0010] Further, the opposite side of the two vertical rods of the same convex support frame is provided with a sliding groove, and the upper surface of the beam pressing rod is fixed with a double-head roller frame near the two ends, the overall shape of the double-head roller frame is a boat shape with an opening upward, and the two ends of the double-head roller frame are respectively provided with abutting rollers, the two abutting rollers are respectively rollingly connected in the corresponding sliding grooves, the double-head roller frame and the abutting rollers slidingly connected in the corresponding sliding grooves can ensure that the beam pressing rod will not appear transverse movement phenomenon.

[0011] Further, the top end of the two convex support frames between the two vertical rods is fixed with a synchronous telescopic rod, and the top end of the synchronous telescopic rod is fixed to the lower surface of the two ends of the beam pressing rod, the two shoulders of the convex support frame are respectively fixed with an L-shaped roller frame extending to the middle, and two rubber supporting rollers are rotatably connected between the four L-shaped roller frames.

[0012] Further, the front and rear sides of the two convex support frames are respectively provided with equal-height incoming material supporting plates and outgoing material supporting plates, and the upper surface of the incoming material supporting plate is higher than the height of the top roller surface of the rubber supporting roller, the upper surface of the incoming material supporting plate is fixed with a limiting partition strip close to the rubber supporting roller, the limiting partition strip and the incoming material supporting plate can arrange the insulator body to be detected in a good position state before detection, which is convenient for rapid detection later.

[0013] Further, the upper surface of the cross beam pressing rod is provided with self-locking screw holes near both ends, and vertically downward extending adjusting telescopic rods are screwed in the two self-locking screw holes, the adjusting telescopic rod comprises an outer threaded tube screwed in the self-locking screw hole, and an annular groove is reserved on the circumferential inner wall of the outer threaded tube near the middle part, an annular check ring is rotatably connected in the annular groove, a tight spring is fixed on the lower surface of the annular check ring, an inner slide rod is fixed on the bottom end of the tight spring, and a driving device and an auxiliary driving device are respectively fixed on the bottom end of the inner slide rod on the side; the driving device comprises a sliding clamping frame fixed on the bottom end of the inner slide rod, a reduction motor is horizontally slidably connected to the lower surface of the sliding clamping frame, a driving compression roller is fixed on the top end of the output shaft of the reduction motor, the driving compression roller is located directly above the end part of the insulator body, and the sliding direction of the reduction motor is consistent with the center line extension direction of the two rubber rollers; the auxiliary driving device comprises an inclined arm pressing rod fixed on the lower surface of the other inner slide rod, two mutually parallel arc-shaped pressing rods are arranged on the lower surface of one end of the inclined arm pressing rod near the insulator body, two axis center lines mutually parallel and equal height anti-dropping pressing wheels are rotatably connected between the two arc-shaped pressing rods, the anti-dropping pressing wheels are respectively located on both sides of the end of the insulator body, and a soft layer is arranged on the roller body outer wall of the anti-dropping pressing wheel; the effect of anti-skid and anti-hard contact can be achieved, the upper surfaces of the inclined arm pressing rod and the sliding clamping frame are respectively fixed with vertical guide slide rods near one end of the pre-detection device, and guide slide holes with diameters matched with the guide slide rods are respectively arranged on the upper surface of the cross beam pressing rod near both ends; the insulator body can be driven according to the detection speed during use.

[0014] Further, the circumferential outer wall of the two outer threaded tubes is provided with an outer hex near the top end, which is convenient for screwing adjustment.

[0015] The beneficial effects in the application are: 1. The closely arranged pre-detection device arranged above the insulator body can perform physical detection on the surface of the insulator body before ultrasonic flaw detection, once the size deviation or surface defect is detected, the position information can be transmitted to the electric sliding block, and then the ultrasonic flaw detection equipment is driven to the defect position to perform accurate internal residual stress nondestructive detection, thereby improving the detection efficiency and making the overall detection link more energy-saving.

[0016] 2. Once the bottom end of the pre-detection device encounters a defective part, the detection rod will swing to one side of the bottom block, and then the pressure sensor will be actuated, so that the existence of defects at the tip of the detection rod of the insulator body can be quickly determined.

[0017] 3. The driving device and the auxiliary driving device are arranged, and the two rubber rollers can stably drive the insulator body with different outer diameters to rotate, and the surface of the insulator body is not damaged during driving, and the extrusion force on the surface of the insulator body is adjustable, so as to avoid leaving marks on the surface. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the overall structure schematic view of the present application; Figure 2 It is the front view of the present application; Figure 3 It is the bottom view of the present application; Figure 4 It is the overall structure schematic view of the present application when detecting; Figure 5 It is the front view of the present application when detecting; Figure 6 It is the sectional structure schematic view along A-A line in the present application; Figure 5 It is the sectional structure schematic view along A-A line in the present application; Figure 7 Figure 6 It is the enlarged structure schematic view at B in the present application; Figure 8 It is the exploded view of the shell structure side view pre-detection device of the present application; Figure 9 It is the partial sectional view of the present application adjusting telescopic rod; Figure 10 It is the exploded view of the inclined arm pressure rod in the present application; Figure 11 It is the three-dimensional structure schematic view of the positioning clamping rod in the present application.

[0019] In the figure: 1, convex support frame; 101, sliding groove; 102, L-shaped roller frame; 2, rubber carrier roller; 3, limiting partition strip; 4, incoming material supporting plate; 5, speed reducer motor; 6, sliding clamping frame; 7, double-head roller frame; 8, cross beam pressure rod; 801, self-locking screw hole; 802, U-shaped notch; 803, guide sliding hole; 9, adjusting telescopic rod; 91, outer threaded tube; 92, abutting spring; 93, inner sliding rod; 94, annular retainer ring; 10, guide sliding rod; 11, driving pressure roller; 12, pre-detection device; 121, anti-falling block; 122, signal lamp; 123, cover plate; 124, guide rail rod; 125, pressure sensor; 126, compression spring; 127, bottom sliding block one; 128, top abutting block; 13, auxiliary driving device; 131, arc-shaped pressure rod; 132, anti-falling pressure wheel; 14, outgoing material supporting plate; 15, synchronous telescopic rod; 16, sliding rail; 17, ultrasonic flaw detection equipment; 171, electric sliding block; 18, insulator body; 19, positioning clamping rod. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments.

[0021] In the embodiment, refer to Figures 1-11 ​The utility model provides an insulator interface residual stress nondestructive flaw detection device, including setting in the two mutually symmetrical convex support frame 1 of conveying the insulator body 18 of waiting for measuring production line, two convex support frame 1's two shoulders are provided with two horizontal and mutually parallel rubber carrier roller 2 respectively, and the overall length of rubber carrier roller 2 is greater than the length of the insulator body 18 of waiting for measuring, and the interval between two rubber carrier rollers 2 is less than the diameter of the insulator body 18, and it is ensured that can hold the insulator body 18, the top intermediate of two convex support frame 1 is fixed with vertical vertical rod, and the top of two convex support frame 1 is slidably connected with the same beam pressing rod 8 between, and the lower surface of beam pressing rod 8 is located above the both ends of insulator body 18 respectively provided with driving device and auxiliary drive equipment 13, can drive the insulator body 18 placed on two rubber carrier rollers 2 slowly rotate, in order to carry out pre-detection or ultrasonic flaw detection, the lateral surface intermediate region of beam pressing rod 8 is provided with a plurality of equidistant distribution U-shaped notch 802, and each U-shaped notch 802 is provided with pre-detection device 12, and pre-detection device 12 includes the detection rod of vertical downward extension, the below of two convex support frame 1 is fixed with slide rail 16 between rubber carrier roller 2, and the slide rail 16 is slidably connected with electric sliding block 171, and the lateral surface of electric sliding block 171 is provided with ultrasonic flaw detection equipment 17 of the shooting direction upwards, through the close arrangement of pre-detection device 12 arranged above the insulator body 18, can carry out physical detection to its surface before carrying out ultrasonic flaw detection, once detects the size deviation or surface defect, can pass position information to electric sliding block 171, then drives ultrasonic flaw detection equipment 17 to operate to the defect position and carries out accurate internal residual stress nondestructive flaw detection, to improve the detection efficiency.

[0022] Reference Figures 6-8The U-shaped notch 802 penetrates the upper and lower sides of the cross beam pressing rod 8, and the top end of the U-shaped notch 802 is fixed with a top abutting block 128 near the groove bottom, and an arc-shaped groove one is reserved on the side of the top abutting block 128 near the groove bottom of the U-shaped notch 802, a detection rod is slidingly connected between the arc-shaped groove one and the groove bottom of the U-shaped notch 802, and the top end of the detection rod is fixed with a falling prevention block 121; a bottom sliding block one 127 sliding towards the groove bottom of the U-shaped notch 802 is arranged near the opening of the U-shaped notch 802, and an arc-shaped groove two is formed on the side of the bottom sliding block one 127 near the detection rod, and the arc-shaped groove two has the same diameter as the arc-shaped groove one; a guide rail 124 for constraining the sliding of the bottom sliding block one 127 is fixed at the opening of the U-shaped notch 802, one same connecting baffle is fixed at the end of the four guide rails 124 away from the detection rod, a pressure sensor 125 is embedded in the middle of the connecting baffle, a convex block is fixed on the upper surface of the middle part of the bottom sliding block one 127, a compression spring 126 is fixed between the convex block and the connecting baffle, and the bottom sliding block one 127 is not in contact with the pressure sensor 125 in the absence of a transverse thrust; through the pre-detection device 12 arranged, once the bottom end encounters a defective part, the detection rod will swing to one side of the bottom sliding block one 127, and then trigger the pressure sensor 125, so that the existence of the defect at the tip of the detection rod of the insulator body 18 can be quickly determined.

[0023] With reference to Figure 7 and Figure 8 , the front surface and the top corner of the cross beam pressing rod 8 near the U-shaped notch 802 are fixed with an outer cover plate 123, and the upper surface of the outer cover plate 123 is fixed with a signal lamp 122, the control end of the signal lamp 122 is connected with a processor through a signal line, and the signal output end of the pressure sensor 125 is connected with the processor through a signal line; through such a setting, the defect position can be quickly displayed in the form of sound and light, so as to make special marks for the staff.

[0024] With reference to Figure 1 and Figure 11 , a positioning clamping rod 19 is clamped to the outer wall of the detection rod near the two ends of the cross beam pressing rod 8 and above the cross beam pressing rod 8, the positioning clamping rod 19 is made of ductile material, the cross section of the positioning clamping rod 19 is C-shaped structure, the number of the positioning clamping rod 19 is matched with the length of the insulator body 18, and the inner diameter of the positioning clamping rod 19 is smaller than the diameter of the falling prevention block 121; through the positioning clamping rod 19 arranged, the pre-detection device 12 at a certain range of the two ends can be locked during detection, so that it cannot be lowered for detection, so that the device can adapt to more specifications of the insulator body 18.

[0025] In the present application, the detection rod is made of ductile metal material, and the tips of two adjacent detection rods will also connect the alarm circuit one after touching. Through such setting, when the rotating insulator body 18 is physically detected, once the skew of the insulator body 18 is detected, the alarm circuit one will be triggered.

[0026] With reference to Figure 1 and Figure 4 , the opposite sides of the two vertical rods of the same convex support frame 1 are provided with sliding grooves 101, and the upper surfaces of the beam pressing rods 8 near the two ends are fixed with double-head roller frames 7, the whole double-head roller frame 7 is in the shape of a boat with the opening upward, and the two ends of the double-head roller frame 7 are respectively provided with abutting rollers, the two abutting rollers are respectively rollingly connected in the corresponding sliding grooves 101, through the double-head roller frame 7 and the abutting rollers rollingly connected in the corresponding sliding grooves 101, it can be ensured that the beam pressing rod 8 will not appear the phenomenon of transverse movement.

[0027] With reference to Figure 1 and Figure 3 , the top ends of the two convex support frames 1 between the two vertical rods are fixed with synchronous telescopic rods 15, and the top ends of the extension rods of the synchronous telescopic rods 15 are respectively fixed to the lower surfaces of the two ends of the beam pressing rod 8, the two shoulders of the convex support frame 1 are respectively fixed with L-shaped roller frames 102 extending to the middle, and the two rubber carrier rollers 2 are rollingly connected between the four L-shaped roller frames 102.

[0028] With reference to Figure 1 and Figure 3 , the front and rear sides of the two convex support frames 1 are respectively provided with equal-height incoming material supporting plates 4 and outgoing material supporting plates 14, and the upper surface of the incoming material supporting plate 4 is higher than the top end roller surface height of the rubber carrier roller 2, the upper surface of the incoming material supporting plate 4 is fixed with a limiting partition strip 3 near the rubber carrier roller 2, through the limiting partition strip 3 and the incoming material supporting plate 4, the insulator body 18 to be detected can be arranged in position before detection, which is convenient for rapid on-site detection in the later period.

[0029] With reference to Figure 5 , Figures 8-10, the upper surface of the cross beam pressing rod 8 is provided with self-locking screw holes 801 near both ends, and a vertically downward extending adjusting telescopic rod 9 is screwed in each of the self-locking screw holes 801, the adjusting telescopic rod 9 comprises an outer threaded tube 91 screwed in the self-locking screw hole 801, and an annular groove is reserved on the circumferential inner wall of the outer threaded tube 91 near the middle part, an annular check ring 94 is rotatably connected in the annular groove, a bottoming spring 92 is fixed on the lower surface of the annular check ring 94, an inner slide rod 93 is fixed on the bottom end of the bottoming spring 92, and a driving device and an auxiliary driving device 13 are respectively fixed on the bottom end of the inner slide rod 93 on the side; the driving device comprises a sliding clamping frame 6 fixed on the bottom end of the inner slide rod 93, and a reduction motor 5 is horizontally slidably connected to the lower surface of the sliding clamping frame 6, a driving pressing roller 11 is fixed on the top end of the output shaft of the reduction motor 5, the driving pressing roller 11 is located directly above the end part of the insulator body 18, and the sliding direction of the reduction motor 5 is consistent with the center line extension direction of the two rubber supporting rollers 2; the auxiliary driving device 13 comprises an inclined arm pressing rod fixed on the lower surface of the other inner slide rod 93, two arc-shaped pressing rods 131 parallel to each other are arranged on the lower surface of one end of the inclined arm pressing rod near the insulator body 18, two anti-dropping pressing wheels 132 with parallel and equal height shaft center lines are rotatably connected between the two arc-shaped pressing rods 131, the anti-dropping pressing wheels 132 are respectively located on both sides of the end part of the insulator body 18, and a soft layer is arranged on the roller body outer wall of the anti-dropping pressing wheel 132; the inclined arm pressing rod and the upper surface of the sliding clamping frame 6 near one end of the pre-detection device 12 are respectively fixed with a vertical guide slide rod 10, and the upper surface of the cross beam pressing rod 8 near both ends is respectively provided with a guide slide hole 803 with a diameter matched with the guide slide rod 10; the insulator body 18 can be driven according to the detection speed during use.

[0030] Referring to Figure 1 and Figure 9 , the circumferential outer walls of the two outer threaded tubes 91 are provided with outer hexagons near the top ends, facilitating screwing adjustment.

[0031] Working principle: when the device is used, firstly control two synchronous telescopic rods 15 to lift the whole cross beam pressing rod 8 to the highest, then move the to-be-tested insulator body 18 near the limiting partition strip 3 to the middle between the two rubber supporting rollers 2, finally adjust the distance between the driving pressing roller 11 and the auxiliary driving device 13, so that the distance between the two is adapted to the distance between the to-be-tested insulator body 18; then control the whole cross beam pressing rod 8 to slowly descend until the driving pressing roller 11 and the anti-falling pressing wheel 132 are loaded on both ends of the insulator body 18 with appropriate pressure, then according to the length of the insulator body 18, lock the two ends of the unnecessary pre-detection device 12 with the positioning clamping rod 19, then start the speed reducer motor 5 to detect the surface defects of the insulator body 18; once the size deviation or surface defects are detected, the position information is transmitted to the electric sliding block 171, and the electric sliding block 171 drives the ultrasonic flaw detection device 17 to run to the defect position for accurate internal residual stress nondestructive testing; at the same time, the signal lamp 122 at the defect position is turned on, and the insulator body 18 at the position can also be marked.

[0032] The above is only the preferred specific implementation of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A non-destructive testing device for residual stress at the interface of an insulator, comprising two mutually symmetrical convex support frames (1), wherein two horizontal and parallel rubber rollers (2) are respectively arranged between the shoulders of the two convex support frames (1); a vertical rod is fixed at the middle of the top of each of the two convex support frames (1), characterized in that, The top ends of the two convex support frames (1) are slidably connected by the same crossbeam pressure rod (8), and the lower surface of the crossbeam pressure rod (8) is provided with a driving device and an auxiliary driving device (13) above the two ends of the insulator body (18); the middle area of ​​the side of the crossbeam pressure rod (8) is provided with multiple U-shaped notches (802) distributed at equal intervals, and each U-shaped notch (802) is provided with a pre-detection device (12), the pre-detection device (12) includes a probe rod extending vertically downward; a slide rail (16) is fixed between the two convex support frames (1) below the rubber roller (2), an electric slider (171) is slidably connected on the slide rail (16), and an ultrasonic flaw detection device (17) with the shooting direction facing upward is provided on the side of the electric slider (171).

2. The non-destructive testing device for residual stress at the interface of an insulator according to claim 1, characterized in that, The U-shaped notch (802) passes through the upper and lower sides of the crossbeam pressure bar (8), and a top abutment block (128) is fixed at the top of the U-shaped notch (802) near the bottom of the groove. An arc-shaped groove is reserved on the side of the top abutment block (128) near the bottom of the U-shaped notch (802). The probe is slidably connected between the arc-shaped groove and the bottom of the U-shaped notch (802). A fall arrestor block (121) is fixed at the top of the probe. A bottom slider (127) is provided at the opening of the U-shaped notch (802) near the bottom, which slides horizontally toward the bottom of the U-shaped notch (802). A second arc-shaped groove is provided on one side of the probe rod, and the diameter of the second arc-shaped groove is the same as that of the first arc-shaped groove; and a guide rail rod (124) for constraining the sliding of the bottom slider (127) is fixed at the opening of the U-shaped notch (802). The four guide rail rods (124) are fixed with the same connecting baffle at the end away from the probe rod. A pressure sensor (125) is embedded in the middle of the connecting baffle. A protrusion is fixed in the middle of the upper surface of the bottom slider (127). A compression spring (126) is fixed between the protrusion and the connecting baffle. The bottom slider (127) does not contact the pressure sensor (125) when it is not subjected to lateral thrust.

3. The non-destructive testing device for residual stress at the interface of an insulator according to claim 2, characterized in that, The crossbeam pressure bar (8) is fixed with an outer cover plate (123) at the front and top corner of the U-shaped notch (802), and a signal light (122) is fixed on the upper surface of the outer cover plate (123). The control end of the signal light (122) is connected to the processor through a signal line, and the signal output end of the pressure sensor (125) is connected to the processor through a signal line.

4. The non-destructive testing device for residual stress at the interface of an insulator according to claim 2, characterized in that, A positioning rod (19) is also attached to the outer wall of the probe rod near both ends of the crossbeam pressure rod (8) and above the crossbeam pressure rod (8). The positioning rod (19) is made of tough material and has a C-shaped cross section. The number of positioning rods (19) used is adapted to the length of the insulator body (18). The inner diameter of the positioning rod (19) is smaller than the diameter of the anti-fall block (121).

5. The non-destructive testing device for residual stress at the interface of an insulator according to claim 3, characterized in that, The detection rod is made of a tough metal material, and the alarm circuit will be activated when the tips of two adjacent detection rods touch.

6. The non-destructive testing device for residual stress at the interface of an insulator according to claim 1, characterized in that, The two vertical rods of the same convex support frame (1) are provided with grooves (101) on opposite sides, and the upper surface of the crossbeam pressure rod (8) is fixed with double-headed roller frames (7) near both ends. The double-headed roller frame (7) is in the shape of a boat with the opening facing upward, and the two ends of the double-headed roller frame (7) are respectively provided with abutting rollers, and the two abutting rollers are respectively rolled and connected in the corresponding grooves (101).

7. The non-destructive testing device for residual stress at the interface of an insulator according to claim 1, characterized in that, The top of each of the two convex support frames (1) is fixed with a synchronous telescopic rod (15) between the two vertical rods, and the top of the extension rod of the synchronous telescopic rod (15) is fixed to the lower surface of both ends of the crossbeam pressure rod (8). The two shoulders of the convex support frame (1) are respectively fixed with L-shaped roller frames (102) extending towards the middle, and two rubber rollers (2) are rotatably connected between the four L-shaped roller frames (102).

8. The non-destructive testing device for residual stress at the interface of an insulator according to claim 1, characterized in that, The front and rear sides of the two convex support frames (1) are respectively provided with a material receiving plate (4) and a material discharging plate (14) of equal height. The upper surface of the material receiving plate (4) is higher than the top roller surface of the rubber roller (2). A limit strip (3) is fixed on the upper surface of the material receiving plate (4) near the rubber roller (2).

9. The non-destructive testing device for residual stress at the interface of an insulator according to claim 1, characterized in that, The upper surface of the crossbeam pressure bar (8) is provided with self-locking screw holes (801) near both ends, and each of the two self-locking screw holes (801) is screwed with a vertically downward extending adjustment telescopic rod (9). The adjustment telescopic rod (9) includes an external threaded tube (91) screwed into the self-locking screw hole (801), and an annular groove is reserved near the middle of the circumferential inner wall of the external threaded tube (91). An annular retaining ring (94) is rotatably connected in the annular groove. A retaining spring (92) is fixed on the lower surface of the annular retaining ring (94), and an inner sliding rod is fixed at the bottom end of the retaining spring (92). (93), the driving device and the auxiliary driving device (13) are respectively fixed to the bottom end of the inner slide rod (93) on the side; the driving device includes a sliding bracket (6) fixed to the bottom end of the inner slide rod (93), and a reduction motor (5) is horizontally slidably connected to the lower surface of the sliding bracket (6). A driving pressure roller (11) is fixed to the top of the output shaft of the reduction motor (5). The driving pressure roller (11) is located directly above the end of the insulator body (18). The sliding direction of the reduction motor (5) is consistent with the extension direction of the center line of the two rubber rollers (2). The auxiliary drive device (13) includes a slanted arm pressure rod fixed to the lower surface of another inner slide rod (93). Two parallel arc-shaped pressure rods (131) are provided on the lower surface of the slanted arm pressure rod near the insulator body (18). Two anti-detachment pressure rollers (132) with parallel axes and equal height are rotatably connected between the two arc-shaped pressure rods (131). The anti-detachment pressure rollers (132) are located on both sides of the end of the insulator body (18). The outer wall of the roller body of the anti-detachment pressure rollers (132) is provided with a soft layer. Vertical guide slide rods (10) are fixed on the upper surface of the slanted arm pressure rod and the sliding bracket (6) near the end of the pre-detection device (12). Guide slide holes (803) that are adapted to the diameter of the guide slide rods (10) are opened on the upper surface of the crossbeam pressure rod (8) near both ends.

10. The non-destructive testing device for residual stress at the interface of an insulator according to claim 9, characterized in that, Both of the externally threaded tubes (91) have external hexagons on their outer circumference near the top.

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