An ultrasonic flaw detection device for steel structure inspection

Abstract

The present invention relates to the technical field of steel structure detection, and specifically to an ultrasonic flaw detection device for steel structure detection, comprising a frame, an outer wall on one side of the frame is in contact with the surface of a steel structure to be detected, two groups of mobile frames are movably connected to the frame, and two capsules are arranged on the outer wall on the other side of the frame. When the two mobile frames are close to each other, the capsules are compressed, and the gas inside them will overflow from the connecting pipe; and a plurality of mobile plates elastically connected to the frame, with a lap plate fixedly installed on the inner end of the mobile plate; it also includes a cylindrical part fixedly installed on the mobile plate, and also includes a fixed ring movably arranged in a through groove. Through the provided capsule, the provided mobile ring and the fixed ring, the surface of the steel structure can be cleaned before detection, and at the same time, the stable filling of the filling liquid can be achieved, thereby ensuring the stable contact between the ultrasonic probe and the steel structure, ensuring the accuracy of the detection structure, and improving the detection efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of steel structure detection, and in particular to an ultrasonic flaw detection device for steel structure detection. Background Art

[0002] Steel structure is a structure made of steel materials, and is one of the main types of building structures today. Steel structure is mainly composed of steel beams, steel columns, steel pipes and other components made of steel sections and steel plates. Steel beams and other components are usually fixed by welding, and in order to ensure the stability of the steel structure, the quality of the completed steel structure welds will be inspected. However, due to the large size of the steel structure, the traditional sampling and testing method is not applicable to the completed steel structure, and it is more common to use ultrasonic flaw detectors for testing.

[0003] Ultrasonic flaw detection is a method of inspecting defects in parts by using the characteristics of ultrasonic energy penetrating deep into metal materials and reflecting at the edge of the interface when entering from one section to another. When the ultrasonic beam passes from the surface of the part through the probe to the inside of the metal, it generates reflected waves when encountering defects and the bottom of the part, forming pulse waveforms on the fluorescent screen. The position and size of the defects are determined based on these pulse waveforms, thereby completing the quality inspection of steel structures.

[0004] In the actual detection process, due to defects such as granular protrusions, uneven surface coating, and dust impurities on the surface of the steel structure, the probe cannot fit well on the surface of the steel structure, which leads to inaccurate detection results. Therefore, in order to ensure the accuracy of the detection results, it is usually necessary to apply filling liquid on the detection area to ensure the fit between the ultrasonic probe and the steel structure to be detected. However, since the filling liquid is usually in a fluid state, the filling liquid will flow under the action of gravity, making it impossible for the filling liquid to completely fill the space between the probe and the steel structure to be detected, affecting the accuracy of the detection results. In view of this, we propose an ultrasonic flaw detection device for steel structure detection. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides an ultrasonic flaw detection device for steel structure inspection, which can effectively solve the problem that in the existing steel structure quality inspection process, when using an ultrasonic flaw detector for inspection, during the actual inspection process, due to defects such as granular protrusions, uneven surface coating, and dust impurities on the surface of the steel structure, the probe cannot fit well on the surface of the steel structure, which leads to inaccurate inspection results. Therefore, in order to ensure the accuracy of the inspection results, it is usually necessary to coat a filling liquid in the inspection area to ensure the fit between the ultrasonic probe and the steel structure to be inspected. However, since the filling liquid is usually in a fluid state, the filling liquid will flow under the action of gravity, so that the filling liquid cannot be completely filled between the probe and the steel structure to be inspected, thereby affecting the accuracy of the inspection results.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] The present invention provides an ultrasonic flaw detection device for steel structure detection, comprising a frame, an outer wall of one side of the frame is in contact with the surface of the steel structure to be detected, two groups of movable frames are movably connected to the frame, and two capsules are arranged on the outer wall of the other side of the frame. When the two movable frames are close to each other, the capsules are compressed, and the gas inside the capsules will overflow from the connecting pipe;

[0008] And, multiple movable plates are elastically connected to the frame body, and the multiple movable plates are arranged in a square structure, a lap plate is fixedly installed at the inner end of the movable plate, an inclined surface is opened on the lap plate, and an extrusion plate is fixedly installed at the end of the movable frame. When two movable frames approach each other, the two extrusion plates slide on the inclined surface and make the movable plate move toward the surface of the steel structure to be detected;

[0009] It also includes a cylindrical member fixedly mounted on the movable plate, a through groove is provided inside the cylindrical member, a lap shaft is fixedly mounted in the middle of the through groove, an ultrasonic probe is inserted into the lap shaft, a guide groove is provided on the outer wall of the lap shaft, and a fixed ring movably arranged in the through groove, a liquid inlet pipe is fixedly mounted on the fixed ring, a movable ring is magnetically adsorbed by the liquid inlet pipe on one side of the fixed ring, the liquid inlet pipe is staggered with the through hole provided on the movable ring, a guide rod is fixedly mounted on the inner wall of the movable ring, and the guide rod is slidably matched with the guide groove;

[0010] The through groove is connected with the inside of the capsule through a connecting pipe. When the gas enters the through groove, it drives the fixing ring to move along the axial direction of the cylindrical member, so that the liquid inlet pipe is connected with the through hole, and the filling liquid is filled between the surface of the steel structure to be detected and the middle of the ultrasonic probe.

[0011] Furthermore, a bending plate is installed at the inner end of the movable frame, the inner outer wall of the bending plate is bonded to the outer wall of the bladder body, the bending plate is slidably matched with a slide groove opened on the outer wall of the frame body, a mounting plate is fixedly connected to the middle of the slide groove, the inner side of the bladder body is bonded to the outer wall of the mounting plate, and the mounting plate is used to fix the connecting pipe; a hand-held rod is fixedly installed on the outer wall of the movable frame, and a contact piece is also fixedly installed on the inner outer wall of the movable frame. When the movable frames approach each other and the contact pieces on different movable frames are in contact, the pump body arranged on the liquid inlet pipe will open, and the external filling liquid will flow in the liquid inlet pipe and fill between the ultrasonic probe and the middle part of the surface of the steel structure to be detected.

[0012] Furthermore, limit frames are fixedly installed at the upper and lower ends of the frame body, and a movable groove is opened inside the limit frame. The movable plate is elastically connected to the inner wall of the movable groove through an elastic member, and the extrusion plate fixed at the end position of the movable frame slides with the inner wall of the movable groove; the end of the movable plate is fixedly connected to the cylindrical member through the detection plate, and in the non-detection stage, the outer wall of the detection plate does not contact the surface of the steel structure to be detected. When the movable frames approach each other, allowing the extrusion plate to complete sliding on the inclined surface, the outer wall of the detection plate fits tightly with the surface of the steel structure to be detected.

[0013] Furthermore, the through groove is set to an opening on one side close to the steel structure to be inspected, and the opening corresponds to the position of the circular hole through which the inspection plate is opened. An annular cooling plate is laid on the inner wall of the circular hole. After the inspection is completed, the filling liquid is cooled and solidified by the cooling plate using a control switch arranged on the movable frame; the fixed ring and the movable ring are both mounted on the lap shaft, and the fixed ring is elastically connected to the inner wall of the through groove by a spring, and the outer walls of the fixed ring and the movable ring are both in contact with the inner wall of the through groove, forming a chamber between the fixed ring and the inner wall of the through groove, and the connecting pipe is connected to the chamber, and when the gas in the connecting pipe enters the chamber, the fixed ring will move along the axial direction of the lap shaft.

[0014] Furthermore, the liquid inlet pipe is a metal pipe, and the movable ring is a magnetic ring. The movable ring and the liquid inlet pipe are magnetically adsorbed, and the end of the liquid inlet pipe is overlapped with the outer wall of the movable ring. When the movable ring slides in the through groove, a guide rod fixedly installed on the inner wall of the movable ring will slide in the guide groove, and at this time, the liquid inlet pipe will slide on the surface of the movable ring.

[0015] Furthermore, the guide groove consists of two straight portions and a bent portion, wherein one straight portion is connected to the upper position of the bent portion, and the other straight portion is connected to the lower position of the bent portion; when the guide rod slides to the straight portion at the lower position, the liquid inlet pipe remains connected to the through hole, and the lower side of the movable ring is on the same plane as the lower end of the ultrasonic probe.

[0016] Furthermore, it also includes a telescopic part movably connected to the lower side of the overlap shaft. When the filling liquid is cooled and solidified, the telescopic part will extend out from the overlap shaft to separate the solidified filling liquid from the inner wall of the through groove.

[0017] Furthermore, it also includes a connecting pipe fixedly connected to the outer wall of the cylindrical member, the connecting pipe is connected to the connecting pipe through the shunt pipe, and when the two movable frames approach each other, the gas in the capsule will blow and clean the surface of the steel structure to be inspected through the connecting pipe.

[0018] Beneficial Effects

[0019] Compared with the known public technology, the technical solution provided by the present invention has the following beneficial effects:

[0020] The present invention, through the provision of a sac, in cooperation with the provision of a movable ring and a fixed ring, can clean the surface of the steel structure before detection, while achieving stable filling of the filling liquid, thereby ensuring stable contact between the ultrasonic probe and the steel structure, ensuring the accuracy of the detection structure, and improving detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 It is a schematic diagram of the overall structure of the ultrasonic flaw detection device of the present invention;

[0023] Figure 2 It is a schematic diagram of the overall explosion structure of the ultrasonic flaw detection device of the present invention;

[0024] Figure 3 It is a structural schematic diagram of the present invention when the frame and the moving part are separated;

[0025] Figure 4 It is a structural schematic diagram of the cylindrical member and the detection plate of the present invention when they are separated;

[0026] Figure 5 It is a schematic diagram of the explosion structure of the cylindrical member of the present invention;

[0027] Figure 6 It is a schematic diagram of the cross-sectional structure of the overlap axis of the present invention;

[0028] Figure 7 It is a schematic diagram of the change of the detection position of the ultrasonic probe after the ultrasonic flaw detection device of the present invention changes the detection area.

[0029] Reference numerals

[0030] 100, frame; 101, slide slot; 110, mounting plate; 120, limit frame; 121, movable slot; 130, capsule;

[0031] 200, mobile frame; 201, contact piece; 210, hand-held rod; 220, extrusion plate; 230, bending plate;

[0032] 300, moving plate; 310, overlapping plate; 311, inclined surface; 320, detection plate; 321, round hole;

[0033] 400, cylindrical member; 401, through groove; 410, overlapping shaft; 411, guide groove; 420, telescopic member; 430, connecting pipe; 440, connecting pipe;

[0034] 500, ultrasonic probe;

[0035] 600, fixed ring; 601, spring; 610, liquid inlet pipe; 620, movable ring; 621, guide rod; 622, through hole. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0037] The present invention will be further described below in conjunction with the embodiments.

[0038] Example:

[0039] Refer to the attached Figure 1-7As shown in, an ultrasonic flaw detection device for steel structure detection includes a frame 100, an outer wall of one side of the frame 100 is in contact with the surface of the steel structure to be detected, two groups of mobile frames 200 are movably connected to the frame 100, and two capsules 130 are arranged on the outer wall of the other side of the frame 100. When the two mobile frames 200 are close to each other, the capsules 130 are compressed, and the gas inside them will overflow from the connecting pipe 430; and a plurality of mobile plates 300 elastically connected to the frame 100, and the plurality of mobile plates 300 are arranged in a square structure, a lap plate 310 is fixedly installed at the inner end of the mobile plate 300, and an inclined surface 311 is opened on the lap plate 310, and an extrusion plate 220 is fixedly installed at the end of the mobile frame 200. When the two mobile frames 200 are close to each other, the two extrusion plates 220 slide on the inclined surface 311 and make the mobile plate 300 move toward the surface of the steel structure to be detected; and also includes a cylindrical member 400 fixedly installed on the mobile plate 300, and the inner part of the cylindrical member 400 The lap shaft 410 is provided with a through groove 401, and a lap shaft 410 is fixedly installed in the middle of the through groove 401, an ultrasonic probe 500 is inserted into the lap shaft 410, and a guide groove 411 is provided on the outer wall of the lap shaft 410, and further includes a fixed ring 600 movably arranged in the through groove 401, a liquid inlet pipe 610 is fixedly installed on the fixed ring 600, and a moving ring 620 is magnetically adsorbed on one side of the fixed ring 600 through the liquid inlet pipe 610, and the liquid inlet pipe 610 is connected to the guide groove 411 provided on the moving ring 620. The through hole 622 is staggered, and a guide rod 621 is fixedly installed on the inner wall of the movable ring 620, and the guide rod 621 is slidably matched with the guide groove 411; the through groove 401 is connected with the inside of the capsule 130 through the connecting tube 430, and when the gas enters the through groove 401, it will drive the fixed ring 600 to move axially along the cylindrical member 400, so that the liquid inlet pipe 610 is connected with the through hole 622, and the filling liquid is filled to between the surface of the steel structure to be detected and the middle of the ultrasonic probe 500.

[0040] First of all, it needs to be determined that the steel structure to be inspected mentioned in the present application refers to a steel structure composed of steel plates with a flat surface, and in the actual inspection process, the multiple inspection plates 320 set in the present application are kept in contact with the surface of the steel structure to be inspected. For steel structures with curved surfaces, the technical solution proposed in the present application can also be applied. The difference is that the contact surface between the inspection plate 320 and the steel structure is set to a corresponding curved surface structure.

[0041] Preparation stage: When using the flaw detection device mentioned in this application, the device is placed on the surface of the steel structure to be inspected, and manually supported so that the surface of the frame 100 is in contact with the surface of the steel structure to be inspected, and then the positions of the two movable frames 200 movably connected to the frame 100 are adjusted so that the two are close to each other.

[0042] Specifically, a bending plate 230 is installed at the inner end of the mobile frame 200, and the inner outer wall of the bending plate 230 is bonded to the outer wall of the capsule 130. The bending plate 230 is slidably matched with the slide groove 101 provided on the outer wall of the frame 100. A mounting plate 110 is fixedly connected to the middle of the slide groove 101. The inner side of the capsule 130 is bonded to the outer wall of the mounting plate 110, and the mounting plate 110 is used to fix the connecting tube 430. A hand-held rod 210 is fixedly installed on the outer wall of the mobile frame 200. In the preparation stage, the positions of the two hand-held rods 210 are manually adjusted so that the two hand-held rods 210 are close to each other. In this process, the bending plates 230 installed on the mobile frame 200 will be close to each other accordingly, thereby squeezing the capsule 130 set on one side thereof.

[0043] First of all, it should be explained that in order to ensure the smoothness of the area to be inspected, and then ensure that the subsequent ultrasonic probe 500 can stably contact the steel structure to be inspected, thereby improving the accuracy of the detection results, the flaw detection device mentioned in the present application includes a connecting pipe 440 fixedly connected to the outer wall of the cylindrical member 400, and the connecting pipe 440 is connected to the connecting pipe 430 through a shunt pipe. When the two movable frames 200 approach each other, the gas in the capsule 130 will blow air and clean the surface of the steel structure to be inspected through the connecting pipe 440. When the capsule 130 is squeezed, the gas inside it will enter the connecting pipe 430. Combined with the connection relationship between the connecting pipe 430 and the connecting pipe 440, the gas will overflow from the side wall of the through groove 401, and the area to be inspected on the surface of the steel structure will be blown and cleaned, thereby improving the cleanliness of the area to be inspected and ensuring that the filling liquid can be stably located between the steel structure and the middle of the ultrasonic probe 500.

[0044] As mentioned above, in the preparation stage, when the two mobile racks 200 are close to each other, the area to be inspected will be cleaned, and the cleaned dust needs to be removed from the area to be inspected. In the present application, when the rack 100 is attached to the surface of the steel structure to be inspected, the corresponding inspection plate 320 is not in contact with the surface of the steel structure, and at this time, it can be ensured that the dust can stably overflow from the gap between the inspection plate 320 and the middle part of the steel structure;

[0045] In the actual detection stage, it is necessary to ensure stable contact between the ultrasonic probe 500 and the steel structure. Therefore, in the actual detection, the position of the detection plate 320 needs to be adjusted so that it can stably contact with the surface of the steel structure during the detection process. In the present application, the upper and lower ends of the frame 100 are fixedly installed with a limit frame 120, and a movable groove 121 is opened inside the limit frame 120. The movable plate 300 is elastically connected to the inner wall of the movable groove 121 through an elastic member, and the extrusion plate 220 fixed at the end position of the movable frame 200 is slidably matched with the inner wall of the movable groove 121; the end of the movable plate 300 is fixedly connected to the cylindrical member 400 through the detection plate 320, and in the non-detection stage, the outer wall of the detection plate 320 does not contact the surface of the steel structure to be detected. When the two mobile frames 200 approach each other, the extrusion plate 220 fixedly installed at the end position of the mobile frame 200 will contact the inclined surface 311 opened on the lap plate 310. During this process, the detection plate 320 will approach the surface of the steel structure to be detected. When the extrusion plate 220 completes sliding on the inclined surface 311, the outer wall of the detection plate 320 fits tightly with the surface of the steel structure to be detected. At this time, the detection area can be determined and is in a relatively sealed state.

[0046] Detection stage: As the two moving racks 200 get closer and the detection plate 320 completes the sealing of the detection area, the gas overflowing from the connecting pipe 440 can be considered to be blocked, and then most of the gas enters the connecting pipe 430 and flows into the through groove 401;

[0047] Specifically, in the present application, the through slot 401 is set to be open near the side of the steel structure to be detected, see the attached Figure 4-5 As shown in the figure, the opening corresponds to the position of the circular hole 321 which is penetrated through the detection plate 320. When the outer wall of the detection plate 320 contacts the surface of the steel structure, a relatively sealed space will be formed at this position, and an area to be detected will be formed on the surface of the steel structure. The fixed ring 600 and the movable ring 620 are both mounted on the lap shaft 410, and the fixed ring 600 is elastically connected to the inner wall of the through groove 401 through the spring 601, and the outer walls of the fixed ring 600 and the movable ring 620 are both fitted with the inner wall of the through groove 401, and a chamber is formed between the fixed ring 600 and the inner wall of the through groove 401, and the connecting pipe 430 is connected to the chamber. When the gas in the connecting pipe 430 enters the chamber, the fixed ring 600 will move along the axial direction of the lap shaft 410.

[0048] Furthermore, the liquid inlet pipe 610 is a metal pipe, and the movable ring 620 is a magnetic ring. The movable ring 620 and the liquid inlet pipe 610 are magnetically adsorbed. Due to the magnetic adsorption relationship between the fixed ring 600 and the movable ring 620, the two can be approximately regarded as being fixedly connected. Then, when the fixed ring 600 moves in the through groove 401, the corresponding movable ring 620 will also move synchronously in the through groove 401, and the end of the liquid inlet pipe 610 keeps overlapping with the outer wall of the movable ring 620.

[0049] When the moving ring 620 slides in the through groove 401, the guide rod 621 fixedly mounted on the inner wall of the moving ring 620 will slide in the guide groove 411, and the liquid inlet pipe 610 will slide on the surface of the moving ring 620. The guide groove 411 is composed of two straight portions and a bent portion, one of which is connected to the upper side of the bent portion, and the other is connected to the lower side of the bent portion; when the guide rod 621 slides to the straight portion at the lower side, the liquid inlet pipe 610 remains connected to the through hole 622, and the lower side of the moving ring 620 and the lower end of the ultrasonic probe 500 are on the same plane. It should be noted that the above-mentioned moving ring 620 will also move synchronously in the through groove 401, but since a guide rod 621 is fixedly installed inside the moving ring 620, and a sliding fit connection is adopted between the guide rod 621 and the guide groove 411 provided on the lap shaft 410, when the above-mentioned moving ring 620 moves axially along the lap shaft 410, it will also rotate synchronously in the radial direction of the lap shaft 410. The purpose is to keep the originally blocked liquid inlet pipe 610 connected with the through hole 622, so that the subsequent filling liquid can be stably filled to the lower side of the moving ring 620, that is, within the above-mentioned detection area, and contact with the surface of the steel structure, thereby completing the replenishment of the filling liquid between the ultrasonic probe 500 and the surface of the steel structure.

[0050] Filling stage: that is, the filling stage of the filling liquid. A contact piece 201 is fixedly installed on the inner and outer walls of the mobile frame 200. When the mobile frames 200 are close to each other to a certain position, the contact pieces 201 on different mobile frames 200 will touch each other, and the pump body set on the liquid inlet pipe 610 will open. The external filling liquid will flow in the liquid inlet pipe 610 and fill between the ultrasonic probe 500 and the middle part of the surface of the steel structure to be detected. In order to ensure the filling time, the contact piece 201 mentioned in this application can be set to a curved structure, which does not affect the continuous approach of the subsequent two mobile frames 200. As an embodiment, the contact piece 201 touches During a certain period of time, the pump body is in an open state, and the delay program can be used to ensure the filling amount of the filling liquid. One point that needs to be mentioned is that the lower side position of the guide groove 411 mentioned above is a straight portion. The purpose of setting this part is to be able to squeeze the filling liquid so that the filling liquid can evenly fill the entire detection area. Combined with the above-mentioned delay program, when the guide rod 621 is in the straight portion of the lower position, the corresponding pump body will be in a stopped running state, while the capsule 130 is still in a state of continuous compression. The purpose of this part of gas driving the movement of the moving ring 620 is to squeeze and homogenize the filling liquid to ensure the accuracy of the detection result.

[0051] When the outer walls of the two movable frames 200 are in contact, the guide rod 621 will be at the lowest position of the guide groove 411. At this time, the ultrasonic probe 500 emits an ultrasonic wave. After a unit time, the ultrasonic emission wave is collected by the receiving end set on the detection plate 320, and a pulse waveform is formed on the fluorescent screen. The defect position and size are judged based on these pulse waveforms, and the quality of the steel structure is further judged subsequently. As a prior art, it will not be elaborated in this application.

[0052] When the detection is completed, an annular cooling sheet is laid on the inner wall of the circular hole 321. After the detection is completed, the control switch set on the mobile frame 200 is used to cool and solidify the filling liquid by using the cooling sheet; it also includes a telescopic member 420 movably connected to the lower side of the lap shaft 410. When the filling liquid is cooled and solidified, the telescopic member 420 will extend from the lap shaft 410 to separate the solidified filling liquid from the inner wall of the through groove 401, thus completing the entire detection process. As for the control means of the telescopic member 420 mentioned in the present application, the position of the telescopic member 420 can be adjusted by controlling the electric telescopic rod in an electric control manner, and the filling liquid in a solidified state can be cleaned. The filling liquid mentioned in the present application can be selected according to actual needs, and a filling liquid with colloidal properties can be selected. The filling liquid only serves as a filler, and its physical properties are used as a filler to complete the above-mentioned detection process. There is no limitation on the specific composition of the filling liquid.

[0053] Further, after the above complete test is completed, combined with the attached Figure 7As shown in , in order to obtain the accuracy of data in multiple tests, the position of the flaw detection device can be adjusted and different ultrasonic probes 500 can be used to detect the same area multiple times. As an implementation method, S1 is the position of the first detection, and the detection position S2 is formed by moving the unit distance upward, which is the straight-line distance between two adjacent ultrasonic probes 500 in the vertical direction, and a corresponding re-inspection area will be formed between the parts. Repeated detection is performed on the same detection area, and multiple comparisons are combined to ensure the accuracy of the detection results.

[0054] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. An ultrasonic flaw detection device for steel structure inspection, It is characterized in that include: A frame (100), wherein an outer wall of one side of the frame (100) is in contact with the surface of the steel structure to be inspected, two groups of movable frames (200) are movably connected to the frame (100), and two capsules (130) are arranged on the outer wall of the other side of the frame (100), and when the two movable frames (200) are close to each other, the capsules (130) are compressed, and the gas inside the capsules will overflow from the connecting pipe (430); and, a plurality of movable plates (300) elastically connected to the frame body (100), wherein the plurality of movable plates (300) are arranged in a square structure, a lap plate (310) is fixedly mounted on the inner end of the movable plate (300), an inclined surface (311) is provided on the lap plate (310), and an extrusion plate (220) is fixedly mounted on the end of the movable frame (200), and when two movable frames (200) are brought close to each other, the two extrusion plates (220) slide on the inclined surface (311), and the movable plate (300) moves toward the surface of the steel structure to be inspected; It also includes a cylindrical member (400) fixedly mounted on the movable plate (300), a through groove (401) being provided inside the cylindrical member (400), a lap shaft (410) being fixedly mounted in the middle of the through groove (401), an ultrasonic probe (500) being inserted into the lap shaft (410), a guide groove (411) being provided on the outer wall of the lap shaft (410), and a fixed ring (600) being movably arranged in the through groove (401), a liquid inlet pipe (610) being fixedly mounted on the fixed ring (600), a movable ring (620) being magnetically adsorbed on one side of the fixed ring (600) through the liquid inlet pipe (610), the liquid inlet pipe (610) being staggered with a through hole (622) provided on the movable ring (620), a guide rod (621) being fixedly mounted on the inner wall of the movable ring (620), and the guide rod (621) being slidably matched with the guide groove (411); The through groove (401) is connected to the interior of the capsule (130) via a connecting tube (430). When gas enters the through groove (401), it drives the fixing ring (600) to move axially along the cylindrical member (400), so that the liquid inlet tube (610) is connected to the through hole (622), and the filling liquid is filled between the surface of the steel structure to be detected and the middle of the ultrasonic probe (500).

2. The ultrasonic flaw detection device for steel structure detection according to claim 1, It is characterized in that A bending plate (230) is installed at the inner end of the movable frame (200), the inner outer wall of the bending plate (230) is bonded to the outer wall of the capsule (130), the bending plate (230) is slidably matched with a slide groove (101) provided on the outer wall of the frame (100), a mounting plate (110) is fixedly connected to the middle of the slide groove (101), the inner side of the capsule (130) is bonded to the outer wall of the mounting plate (110), and the mounting plate (110) is used to fix the connecting pipe (430); A hand-held rod (210) is fixedly mounted on the outer wall of the mobile frame (200), and a contact piece (201) is also fixedly mounted on the inner outer wall of the mobile frame (200). When the mobile frames (200) are brought close to each other and the contact pieces (201) on different mobile frames (200) are in contact, the pump body arranged on the liquid inlet pipe (610) is opened, and the external filling liquid flows in the liquid inlet pipe (610) and is filled between the ultrasonic probe (500) and the middle of the surface of the steel structure to be detected.

3. The ultrasonic flaw detection device for steel structure detection according to claim 2, It is characterized in that A limit frame (120) is fixedly installed at the upper and lower ends of the frame body (100), a movable groove (121) is provided inside the limit frame (120), the movable plate (300) is elastically connected to the inner wall of the movable groove (121) through an elastic member, and the extrusion plate (220) fixed at the end position of the movable frame (200) is slidably matched with the inner wall of the movable groove (121); The end of the movable plate (300) is fixedly connected to the cylindrical member (400) via the detection plate (320), and in a non-detection stage, the outer wall of the detection plate (320) does not contact the surface of the steel structure to be detected. When the movable frames (200) are brought closer to each other so that the extrusion plate (220) completes sliding on the inclined surface (311), the outer wall of the detection plate (320) is tightly fitted to the surface of the steel structure to be detected.

4. The ultrasonic flaw detection device for steel structure detection according to claim 3, It is characterized in that The through groove (401) is provided with an opening near a side of the steel structure to be inspected, and the opening corresponds to the position of a circular hole (321) through-opened on the inspection plate (320). An annular cooling sheet is laid on the inner wall of the circular hole (321). After the inspection is completed, the filling liquid is cooled and solidified by the cooling sheet using a control switch provided on the mobile frame (200); The fixed ring (600) and the movable ring (620) are both sleeved on the overlapping shaft (410), and the fixed ring (600) is elastically connected to the inner wall of the through groove (401) through the spring (601), and the outer walls of the fixed ring (600) and the movable ring (620) are both in contact with the inner wall of the through groove (401), and a chamber is formed between the fixed ring (600) and the inner wall of the through groove (401), and the connecting pipe (430) is kept in communication with the chamber. When the gas in the connecting pipe (430) enters the chamber, the fixed ring (600) moves along the axial direction of the overlapping shaft (410).

5. The ultrasonic flaw detection device for steel structure detection according to claim 4, It is characterized in that The liquid inlet pipe (610) is a metal pipe, the movable ring (620) is a magnetic ring, the movable ring (620) and the liquid inlet pipe (610) are magnetically adsorbed, and the end of the liquid inlet pipe (610) is overlapped with the outer wall of the movable ring (620); When the moving ring (620) slides in the through groove (401), the guide rod (621) fixedly mounted on the inner wall of the moving ring (620) will slide in the guide groove (411), and at this time, the liquid inlet pipe (610) will slide on the surface of the moving ring (620).

6. The ultrasonic flaw detection device for steel structure detection according to claim 5, It is characterized in that The guide groove (411) is composed of two straight portions and a bent portion, wherein one straight portion is connected to the upper side of the bent portion, and the other straight portion is connected to the lower side of the bent portion; When the guide rod (621) slides to the straight portion at the lower position, the liquid inlet pipe (610) remains connected to the through hole (622), and the lower side of the movable ring (620) and the lower end of the ultrasonic probe (500) are on the same plane.

7. The ultrasonic flaw detection device for steel structure detection according to claim 6, It is characterized in that It also includes a telescopic member (420) movably connected to the lower side of the overlap shaft (410). When the filling liquid is cooled and solidified, the telescopic member (420) will extend out from the overlap shaft (410) to separate the solidified filling liquid from the inner wall of the through groove (401).

8. The ultrasonic flaw detection device for steel structure detection according to claim 7, It is characterized in that It also includes a connecting pipe (440) fixedly connected to the outer wall of the cylindrical member (400), the connecting pipe (440) being connected to the connecting pipe (430) via a shunt pipe, and when the two movable frames (200) are close to each other, the gas in the capsule (130) will be blown through the connecting pipe (440) to clean the surface of the steel structure to be inspected.

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