Ultrasonic detection probe and detector for welding defects of metal tank body

Abstract

The invention relates to the technical field of ultrasonic detection, in particular to a metal tank welding defect ultrasonic detection probe and detector which comprises a fixing frame, a fixing ring, a steering mechanism, a first telescopic rod, a second telescopic rod, a rotating disc, a third telescopic rod, a torsion mechanism, a base, a detection device, a driving assembly and a triggering assembly. The fixing frame is provided with a steering mechanism, the steering mechanism is hinged to one end of a second telescopic rod through a first telescopic rod, the other end of the second telescopic rod is connected with a torsion mechanism, the torsion mechanism is connected with a rotary disc, and a plurality of third telescopic rods are arranged on the side wall of the rotary disc. The support is provided with the driving assembly and the triggering assembly, the supporting rod is locked and released through the triggering assembly according to the flatness of the tank body, the driving assembly is used for lifting the supporting rod, the situation that the accuracy is lowered due to vibration when the detection device passes through an intersecting welding line is avoided, and the detection accuracy is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of ultrasonic detection, and in particular to a metal tank welding defect ultrasonic detection probe and detector. Background Art

[0002] Welding is a vital link in the connection of workpieces, involving the process of fixing two or more parts together to form an integral structure. Problems such as pores, cracks, slag inclusions and unfusion may occur during the welding process. These problems may affect the welding quality, connection strength and the performance of the final product. Therefore, quality inspection of welding is crucial. Ultrasonic testing is a non-destructive testing technology for metal welding inspection. It uses high-frequency sound waves to propagate in the material and detect echoes to find defects and problems inside the material. When performing ultrasonic testing on the inner wall of a normal pressure storage tank, personnel have to enter the box, which will lead to the risk of hypoxia. In addition, some entrances and exits are small, and personnel cannot enter, which increases the difficulty of weld inspection.

[0003] In response to the above problems, the prior art provides a solution. For example, patent application number CN202311238574.8 provides an ultrasonic flaw detection device. The patent provides a solution including a bracket and a guide frame. The bracket has two vertically arranged adjustable length telescopic rods. The guide frame consists of two connected guide support rods connected to a driving source. The detection mechanism includes a mounting base and a mounting plate, on which a weld scanner, a detection head and a coating component are arranged, and an adjustment component is used to adjust the coating direction of the coating component. The invention controls the detection head to fit the weld by a telescopic rod, and controls the telescopic rod to rotate along the axis of the tank body by a driving source, so as to realize automatic detection of weld defects. This ultrasonic flaw detection device is suitable for the detection of welds on horizontal storage tanks, which improves the detection efficiency and reliability. However, during the operation of the telescopic rod, the mounting base cannot play a supporting role. Due to the effect of gravity, the telescopic rod will bend, causing the position of the probe to shift. Therefore, a support component can be opened on the mounting base to solve the problem of the telescopic rod bending due to gravity. However, in the production process of the storage tank, the metal plate is bent and welded into a round tube, and then multiple sections of the round tube are welded again, and arc-shaped cover plates are welded at both ends, which causes the welding lines to intersect in some places. Since the probe can only perform linear detection on a single welding line, when the mounting base passes through these intersections, the ultrasonic probe will be vibrated because the welding line is uneven, thereby affecting the accuracy of the detection head. Summary of the invention

[0004] The purpose of the present invention is to provide a metal tank welding defect ultrasonic detection probe and detector to solve the problem that the bending of the telescopic rod causes the probe position to shift and the vibration caused when the detection device passes through the intersecting welding line, which reduces the accuracy of the detection head.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A metal tank welding defect ultrasonic detection detector comprises a fixing frame, a fixing ring, a steering mechanism, a No. 1 telescopic rod, a No. 2 telescopic rod, a turntable, a No. 3 telescopic rod, a torsion mechanism, a base, a detection device, a brush wheel, a bracket, a support rod and a turntable, wherein the outer ring of the fixing frame is provided with a fixing ring, the center of the fixing frame is provided with a steering mechanism, the steering mechanism is connected to one end of the No. 1 telescopic rod, the other end of the No. 1 telescopic rod is hinged to one end of the No. 2 telescopic rod, the other end of the No. 2 telescopic rod is connected to the torsion mechanism, the torsion mechanism is rotatably connected to the center of the turntable, a plurality of No. 3 telescopic rods are evenly connected to the side wall of the turntable, the other end of the No. 3 telescopic rod is connected to the base, a detection device is installed at the center of the lower end surface of the base, and brush wheels are installed at the front and back of the detection device.

[0007] Specifically, the bracket is provided with a driving assembly and a trigger assembly, the driving assembly includes a bracket, a support rod and a rotating wheel, the bracket is installed on both sides of the base, the support rod is movably installed on the bracket, and a rotating wheel is rotatably installed on one end of the support rod. The trigger assembly locks the support rod or releases the lock of the support rod according to the flatness of the tank body, and the driving assembly is used to lift the support rod when the trigger assembly releases the lock of the support rod.

[0008] It is easy to understand that when detecting the welding line inside the tank body, the fixing frame is placed horizontally at the opening of the tank body. The outer ring of the fixing frame is provided with a fixing ring to clamp the wall of the tank body opening, which is used to fix the fixing frame to ensure the stable operation of the subsequent equipment. A steering mechanism is provided at the center of the fixing frame. The rotation of the steering mechanism drives the No. 1 telescopic rod to swing. The No. 2 telescopic rod is parallel to the axis of the tank body through the extension and contraction of the No. 1 telescopic rod and the rotation of the steering mechanism. The No. 2 telescopic rod is connected to the torsion mechanism. The extension and contraction of the No. 2 telescopic rod makes the torsion mechanism move in the axial direction. The rotating shaft of the torsion mechanism is connected to the center of the turntable. The side wall of the turntable is evenly connected with three No. 3 telescopic rods. The other end of the No. 3 telescopic rod is connected to the base, a detection device is installed at the center of the lower end surface of the base, and brush wheels are installed in front and behind the detection device. The rotation of the torsion mechanism drives the turntable to rotate, and the detection device on the base coincides with the welding line through the telescopic adjustment of the No. 3 telescopic rod. At the same time, the turntable drives the No. 3 telescopic rod to rotate. The No. 3 telescopic rod rotates and retracts to make the base move in a circle along the inner wall of the tank, driving the detection device to detect the welding line. There is a gap between the probe and the weld during the detection process. The coupling agent is applied by the brush wheel to avoid the gap between the probe and the weld during the detection process, which causes the detection accuracy to be reduced, thereby ensuring the detection accuracy.

[0009] Furthermore, since the second telescopic rod bends under the action of gravity, the position of the probe is offset, which reduces the accuracy of detection. Therefore, it is designed to install brackets on both sides of the base, and the brackets are provided with a driving assembly and a trigger assembly. A support rod is installed on the bracket, and a rotating wheel is rotatably installed on one end of the support rod. The trigger assembly locks the support rod or releases the lock of the support rod according to the flatness of the tank body. The driving assembly is used to lift the support rod when the trigger assembly contacts the support rod and locks it. The support rod and the rotating wheel provide an upward supporting force to offset the gravity exerted on the second telescopic rod, thereby avoiding the problem of the probe position being offset, which reduces the accuracy of detection and ensures the accuracy of detection.

[0010] Optionally, the rotational steering mechanism and the torsion mechanism may be any one of a pneumatic motor, an electric motor and a hydraulic motor. The pneumatic motor and the hydraulic motor require an air pump device and a hydraulic station respectively. However, due to the inconvenience caused during use and the use of oil cylinders and air cylinders will increase the equipment cost of the metal tank welding defect ultrasonic detector, the present invention preferably uses electric motors as the driving elements of the steering mechanism and the torsion mechanism.

[0011] Preferably, the driving assembly includes a telescopic spring and a card block, the support rod includes a number one wheel rod and a number two wheel rod, the number one wheel rod is symmetrically mounted at both ends of the bracket, a card slot is provided on one side of the number one wheel rod, the number two wheel rod is mounted on the bracket, the number two wheel rod is located between the two number one wheel rods, card slots are symmetrically provided on both sides of the number two wheel rod, the card slot on the number one wheel rod faces the number two wheel rod, a telescopic spring is coaxially mounted on the number one wheel rod and the number two wheel rod, two ends of the telescopic spring are respectively connected to the number one wheel rod, the number two wheel rod and the bracket, guide grooves are horizontally provided on the bracket between the number two wheel rod and the two number one wheel rods, card blocks are slidably mounted in the guide grooves, two ends of the card block cooperate with the card slots, and the trigger assembly is connected to the card block.

[0012] During the production of piggy banks, metal plates are bent and welded into round tubes, and then multiple sections of the round tubes are welded again, and arc-shaped covers are welded on both ends, which causes the welding lines to intersect. Since the probe can only detect a single welding line, when the detection device passes through these intersections, the welding lines are uneven, and the detection device will shake when passing through the intersecting welding lines, resulting in a decrease in detection accuracy. Therefore, it is designed to symmetrically install No. 1 wheel rods at both ends of the bracket, and a No. 2 wheel rod is installed between the two No. 1 wheel rods. Slots are symmetrically provided on both sides of the wheel rods. A slot is provided on one side of the No. 1 wheel rod, and the slot faces the No. 2 wheel rod. The card block is horizontally installed in the guide slot provided on the bracket, and the two ends cooperate with the slots. Telescopic springs are coaxially installed on the No. 1 wheel rod and the No. 2 wheel rod, and the two ends of the telescopic spring are respectively connected to the No. 1 wheel rod, the No. 2 wheel rod and the bracket, so that the number of the No. 2 wheel rod can be increased to three or more groups to adapt to different usage scenarios. Before passing through the intersecting welding line, the No. 1 wheel rods on the left and right sides are in a locked state, and the No. 2 wheel rod is in an unlocked state. When When passing the welding line, the card block is separated from the card slot on the No. 1 wheel rod, and the No. 1 wheel rod is changed from the locked state to the unlocked state. The telescopic spring is stretched due to the length of the locked state. When the card block leaves the card slot, the telescopic spring contracts, driving the No. 1 wheel rod and the rotating wheel to lift. When the card block leaves the card slot of the No. 1 wheel rod, the other end of the card block fits into the card slot on one side of the No. 2 wheel rod, and the No. 2 wheel rod is changed from the unlocked state to the locked state. Under the action of the card block and the card slot, the No. 2 wheel rod moves downward, and the rotating wheel contacts the tank wall to provide an upward supporting force to the base through the bracket. When the welding line comes between the No. 1 wheel rod and the No. 2 wheel rod, the clamping block leaves the No. 2 clamping slot, and the No. 2 wheel rod changes from the locked state to the unlocked state. The contraction of the telescopic spring drives the No. 2 wheel rod and the rotating wheel to lift up. At the same time, the clamping block fits into the clamping slot of the No. 1 wheel rod, and the unlocked state of the No. 1 wheel rod changes from the locked state to the locked state. The same process is repeated until all the rotating wheels pass through the welding line. This avoids the problem of jitter when the rotating wheel directly contacts the intersecting welding line, thereby reducing the detection accuracy and ensuring the detection accuracy of the detection device.

[0013] Preferably, the trigger assembly includes a No. 1 touch rod, a No. 2 touch rod and a connecting rod, the No. 1 touch rod and the No. 2 touch rod are symmetrically hinged on the bracket, the No. 1 touch rod and the No. 2 touch rod are respectively located between the No. 1 wheel rod and the No. 2 wheel rod, the connecting rod is hinged on the bracket, one end of the No. 1 touch rod and the No. 2 touch rod is provided with a sliding groove, the No. 1 touch rod is slidingly hinged with the block through the sliding groove, one end of the connecting rod is hinged with the block, and the other end is slidably installed in the sliding groove of the No. 2 touch rod.

[0014] The first and second touch rods are respectively located between the first and second wheel rods and the second wheel rods. When the welding line is detected and passes through the intersecting welding line, in order to enable the card block to change with the position change of the welding line to avoid the welding line and the rotating wheel from shaking, thereby causing the accuracy of detection to decrease. Therefore, a No. 1 touch rod and a No. 2 touch rod are hinged on the bracket. The No. 1 touch rod is slidably hinged with the card block through a slide groove. The connecting rod is hinged on the bracket. One end of the connecting rod is hinged with the card block, and the other end is slidably installed in the slide groove of the No. 2 touch rod. The No. 1 touch rod and the No. 2 touch rod are respectively located between the No. 1 wheel rod and the No. 2 wheel rod. When passing through the intersecting welding line, the touch rod first contacts the welding line, the touch rod deflects, and the card block connected to the slide groove moves, thereby converting the states of the No. 1 touch rod and the No. 2 touch rod, driving the rotating wheel to rise and fall, so that the card block changes with the position change of the welding line to avoid the welding line and the rotating wheel from shaking, thereby causing the accuracy of the detection head to decrease, thereby ensuring the accuracy of detection by the detection device.

[0015] Preferably, the touch rod includes a rocker arm portion, a touch arm portion and a contact portion, the rocker arm portion is connected to the center of the touch arm portion, the rocker arm portion and the touch arm portion are connected to form a Y shape, a slide groove is provided on the rocker arm portion, and contacts are connected at both ends of the touch arm portion.

[0016] During the detection process, the position of the welding line is constantly changing relative to the detection device. In order to enable the card block to maintain linkage with the position of the following welding line, the rocker arm part and the contact arm part are designed to be connected in a Y shape. The connection between the rocker arm part and the contact arm part is the hinge between the contact rod and the bracket. The contact part contacts the inner wall of the tank body. Since the welding line has a certain height, when the contact part contacts the welding line, one end of the contact arm part is driven to lift, and through the hinge with the bracket, the other end of the contact part contacts the inner wall of the tank body again, so that the card block and the position of the following welding line are maintained in linkage, ensuring the normal operation of the detection device.

[0017] Preferably, the contact arm portion is V-shaped on both sides, and the ports on both sides of the contact arm portion are connected to the contact portions.

[0018] Due to the different heights of the welding lines, when the contact part passes through the welding line and is at a low point, the wheel is not lifted up enough, causing the wheel to contact the welding line, resulting in a decrease in the detection accuracy of the detection head. Therefore, the two sides of the contact arm are set to be V-shaped to increase its contact points, avoid the wheel being lifted up insufficiently, causing the wheel to contact the welding line, resulting in a decrease in the detection accuracy of the detection head, and ensure the accuracy of detection.

[0019] Preferably, the contact portion is fan-shaped, a contact surface is provided at the bottom of the contact portion, and the contact surface is located on the fan-shaped arc surface.

[0020] During the detection process, the contact part moves forward and provides a forward force, while the welding line provides an opposite thrust. In order to be able to contact the welding line through the contact part and drive the contact arm part to lift, the contact part is designed to be fan-shaped, and the bottom of the contact part is set as a contact surface. The direction of the force is changed through the guiding effect of the contact surface, and the thrust is converted into a force to lift the contact arm part, thereby realizing the lifting of the contact arm part.

[0021] Preferably, the block is in an inverted trapezoidal shape, and both ends of the block are provided with a self-slip coating.

[0022] When the block is matched with the slot, the inclined surface on the side of the block acts on the inclined surface of the slot to make the block move horizontally and convert it into longitudinal movement of the No. 1 wheel rod and the No. 2 wheel rod. In this process, the two ends of the block and the slot will be worn, which will increase the matching distance between the block and the slot, resulting in insufficient lifting height of the wheel, contact between the wheel and the welding line, vibration of the detection device, and reduced detection accuracy. Therefore, a self-slip coating is provided at both ends of the block to avoid wear during the matching process between the two ends of the block and the slot, and to avoid the problem that wear increases the matching distance between the block and the slot, resulting in insufficient lifting height of the wheel, contact between the wheel and the welding line, vibration of the detection device, and reduced detection accuracy, thereby ensuring the accuracy of detection by the detection device.

[0023] Preferably, a pinhole is provided in the guide groove, a card pin is slidably installed in the pinhole, a compression spring is provided between the card pin and the bottom of the pinhole, a plurality of pin slots are provided in the card block, and the card pin cooperates with the pin slots.

[0024] In the locked state, when the card block cooperates with the card number, the spring has a contraction force that is always upward, causing the card block to move laterally. The movement of the card block will drive the feeler rod to deflect, making it impossible for the contact surface on the feeler rod to fit with the inner wall of the tank body, and the problem of being unable to be triggered when encountering a welding line is caused. Therefore, a pinhole is provided in the groove on the bracket, and a card pin is slidably installed in the pinhole. A compression spring is connected between the card pin and the bottom of the pinhole. The card block is provided with a plurality of pin slots, and the card pin cooperates with the pin slots. When the card block and the card slot are fitted, the card pin and the pin slot cooperate to limit the movement of the card block and avoid the contraction force of the spring, causing the card block to move laterally. The movement of the card block will drive the feeler rod to deflect, making it impossible for the contact surface on the feeler rod to fit with the inner wall of the tank body, and the problem of being unable to be triggered when encountering a welding line is caused, thereby ensuring the normal operation of the detection device.

[0025] An ultrasonic detection probe used for the above-mentioned metal tank welding defect ultrasonic detection detector comprises a body and a support spring, wherein the body is connected to a base via the support spring.

[0026] When the brush wheel brushes coupling agent on the inner wall of the tank and the welding line, the probe will fit the welding line for detection. However, due to the unevenness of the welding line and the difference in thickness of the coupling agent, the probe and the welding line do not fit tightly or the coupling agent is unevenly distributed in the gap, which reduces the detection accuracy. Therefore, the design body is connected to the base through a support spring, so that the support spring provides a downward force to make the probe fit the welding line, and can also squeeze the coupling agent so that the coupling agent fills the gap between the probe and the welding line, avoiding the problem that the welding line is uneven and the thickness of the coupling agent is different, causing the probe and the welding line to fit loosely or the coupling agent is unevenly distributed in the gap, which reduces the detection accuracy, thereby ensuring the detection accuracy of the detection device.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. The present invention uses a driving component to detect welding lines. When passing through the intersecting welding lines, the clamping block cooperates with the No. 1 wheel rod and the No. 2 wheel rod to realize the mutual conversion between the locked state and the unlocked state of the No. 1 wheel rod and the No. 2 wheel rod. The telescopic spring lifts the No. 1 wheel rod and the No. 2 wheel rod, and the rotating wheel provides an upward supporting force to solve the problem that the telescopic rod is bent, causing the probe position to shift and the ultrasonic probe to vibrate when the detection device passes through the intersecting welding line, so that the detection accuracy is reduced, thereby ensuring the detection accuracy.

[0029] 2. The present invention uses a trigger assembly, and the feeler rod is symmetrically located between the first wheel rod and the second wheel rod. When passing through the intersecting welding line, the feeler rod first contacts the welding line, the feeler rod is deflected, and the block connected to the slide groove moves. Through the hinge connection with the bracket, one end of the contact part is always in contact with the inner wall of the tank body, so that the block changes with the position change of the welding line, thereby ensuring the normal operation of the detection device.

[0030] 3. The present invention adopts the design of the touch rod, and connects the rocker arm part and the touch arm part into a Y shape. The touch arm part is V-shaped on both sides. The ports on both sides of the touch arm part are connected with contact parts. The contact part is fan-shaped. A contact surface is provided at the bottom of the contact part. The contact surface is located on the fan-shaped arc surface. This can solve the problem of reduced detection accuracy of the detection head caused by the different heights of the welding lines and the contact between the contact part and the welding line. At the same time, it can solve the problem of maintaining linkage between the position of the card block and the following welding line. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the installation of the ultrasonic detection probe and detector for metal tank welding defects of the present invention;

[0032] Figure 2 It is a schematic diagram of the overall structure of the ultrasonic detection probe and detector for metal tank welding defects of the present invention;

[0033] Figure 3 For the present invention Figure 2 A partial enlarged view of the middle A;

[0034] Figure 4 For the present invention Figure 3 A partial enlarged view of point B in the middle;

[0035] Figure 5 It is a schematic diagram of the structure of the driving component and triggering component of the tank welding defect ultrasonic detection probe and detector of the present invention;

[0036] Figure 6 For the present invention Figure 5 A partial enlarged view of point C in the middle;

[0037] Figure 7 For the present invention Figure 5 Cross-sectional view of the middle DD;

[0038] Figure 8 For the present invention Figure 7 A partial enlarged view of point E in the middle.

[0039] In the figure: 1. fixing frame; 2. fixing ring; 3. steering mechanism; 41. telescopic rod No. 1; 42. telescopic rod No. 2; 43. telescopic rod No. 3; 5. turntable; 6. torsion mechanism; 7. base; 71. detection device; 72. brush wheel; 8. driving assembly; 81. bracket; 811. guide groove; 812. pinhole; 813. card needle; 814. compression spring; 82. card block; 821. self-slip coating; 822. needle groove; 83. telescopic spring; 84. support rod; 841. wheel rod No. 1; 842. wheel rod No. 2; 843. card slot; 85. rotating wheel; 9. trigger assembly; 91. touch rod No. 1; 92. touch rod No. 2; 93. connecting rod; 94. slide groove; 95. contact surface; 96. rocker arm; 97. touch arm; 98. contact part; 10. support spring. DETAILED DESCRIPTION

[0040] See also Figures 1 to 8 The present invention provides a metal tank welding defect ultrasonic detection probe and detector, the technical scheme is as follows:

[0041] A metal tank welding defect ultrasonic detection detector comprises a fixing frame 1, a fixing ring 2, a steering mechanism 3, a No. 1 telescopic rod 41, a No. 2 telescopic rod 42, a turntable 5, a No. 3 telescopic rod 43, a torsion mechanism 6, a base 7, a detection device 71, a brush wheel 72, a bracket 81, a support rod 84 and a turntable 85. The outer ring of the fixing frame 1 is provided with a fixing ring 2, the center of the fixing frame 1 is provided with a steering mechanism 3, the steering mechanism 3 is connected to one end of the No. 1 telescopic rod 41, the other end of the No. 1 telescopic rod 41 is hinged to one end of the No. 2 telescopic rod 42, the other end of the No. 2 telescopic rod 42 is connected to the torsion mechanism 6, the torsion mechanism 6 is rotatably connected to the center of the turntable 5, a plurality of No. 3 telescopic rods 43 are evenly connected to the side wall of the turntable 5, the other end of the No. 3 telescopic rod 43 is connected to the base 7, the center of the lower end surface of the base 7 is installed with a detection device 71, and brush wheels 72 are installed before and after the detection device 71.

[0042] Specifically, a driving assembly 8 and a trigger assembly 9 are provided on the bracket 81. The driving assembly 8 includes a bracket 81, a support rod 84 and a rotating wheel 85. The bracket 81 is installed on both sides of the base 7. A support rod 84 is movably installed on the bracket 81. A rotating wheel 85 is rotatably installed at one end of the support rod 84. The trigger assembly 9 locks the support rod 84 or releases the lock of the support rod 84 according to the flatness of the tank body. The driving assembly 8 is used to lift the support rod 84 when the trigger assembly 9 releases the lock of the support rod 84.

[0043] See also Figure 2 , Figure 3 , Figure 5 , Figure 6 and Figure 7 The driving assembly 8 includes a telescopic spring 83 and a clamping block 82, the support rod 84 includes a No. 1 wheel rod 841 and a No. 2 wheel rod 842, the No. 1 wheel rod 841 is symmetrically installed at both ends of the bracket 81, and a clamping groove 843 is opened on one side of the No. 1 wheel rod 841, and the No. 2 wheel rod 842 is installed on the bracket 81, and the No. 2 wheel rod 842 is located between the two No. 1 wheel rods 841, and the clamping grooves 843 are symmetrically opened on both sides of the No. 2 wheel rod 842, and the clamping grooves 843 on the No. 1 wheel rod 841 face A telescopic spring 83 is coaxially installed on the number two wheel rod 842, the number one wheel rod 841 and the number two wheel rod 842, and two ends of the telescopic spring 83 are respectively connected to the number one wheel rod 841, the number two wheel rod 842 and the bracket 81, and guide grooves 811 are horizontally opened on the bracket 81 between the number two wheel rod 842 and the two number one wheel rods 841, and blocks 82 are slidably installed in the guide grooves 811, and two ends of the blocks 82 cooperate with the slots 843, and the trigger assembly 9 is connected to the blocks 82.

[0044] Furthermore, the block 82 is in an inverted trapezoidal shape, and self-slip coatings 821 are provided at both ends of the block 82 .

[0045] See also Figure 2 , Figure 3 , Figure 4 and Figure 5 The trigger assembly 9 includes a No. 1 touch rod 91, a No. 2 touch rod 92 and a connecting rod 93. The No. 1 touch rod 91 and the No. 2 touch rod 92 are symmetrically hinged on the bracket 81. The No. 1 touch rod 91 and the No. 2 touch rod 92 are respectively located between the No. 1 wheel rod 841 and the No. 2 wheel rod 842. The connecting rod 93 is hinged on the bracket 81. One end of the No. 1 touch rod 91 and the No. 2 touch rod 92 is provided with a slide groove 94. The No. 1 touch rod 91 is slidably hinged to the block 82 through the slide groove 94. One end of the connecting rod 93 is hinged to the block 82, and the other end is slidably installed in the slide groove 94 of the No. 2 touch rod 92.

[0046] Furthermore, the touch rod includes a rocker arm portion 96, a contact arm portion 97 and a contact portion 98. The rocker arm portion 96 is connected to the center of the contact arm portion 97. The rocker arm portion 96 and the contact arm portion 97 are connected to form a Y shape. A slide groove 94 is provided on the rocker arm portion 96. Contact portions 98 are connected to both ends of the contact arm portion 97. The contact arm portion 97 is V-shaped on both sides. The contact portions 98 are connected to the ports on both sides of the contact arm portion 97. The contact portion 98 is fan-shaped. A contact surface 95 is provided at the bottom of the contact portion 98. The contact surface 95 is located on the fan-shaped arc surface.

[0047] See also Figure 8 A pinhole 812 is provided in the guide groove 811, and a card pin 813 is slidably installed in the pinhole 812. A compression spring 814 is connected between the card pin 813 and the bottom of the pinhole 812. The card block 82 has a plurality of pin grooves 822, and the card pin 813 cooperates with the pin grooves 822.

[0048] See also Figures 1 to 8 An ultrasonic detection probe used for the above-mentioned metal tank welding defect ultrasonic detection detector includes a main body and a support spring 10, and the main body is connected to the base 7 through the support spring 10.

[0049] Working principle: when detecting the welding line inside the tank body, the fixing frame 1 is placed horizontally at the opening of the tank body. The outer fixing ring 2 of the fixing frame 1 clamps the wall of the tank body opening to fix the fixing frame 1, so as to ensure the stable operation of the equipment behind. The central steering mechanism 3 of the fixing frame 1 rotates to drive the No. 1 telescopic rod 41 to swing. The No. 2 telescopic rod 42 is parallel to the axis of the tank body through the extension and contraction of the No. 1 telescopic rod 41 and the rotation of the steering mechanism 3. The No. 2 telescopic rod 42 is connected to the torsion mechanism 6. The extension and contraction of the No. 2 telescopic rod 42 makes the torsion mechanism 6 move in the axial direction. The rotating shaft of the torsion mechanism 6 is connected to the center of the turntable 5. Three No. 3 telescopic rods 43 are evenly connected to the side wall of the turntable 5. The other end of the No. 3 telescopic rod 43 is connected to the base 7. The center of the lower end surface of the base 7 is equipped with a detection rod. The detection device 71 is provided with brush wheels 72 at the front and rear of the detection device 71. The rotation of the torsion mechanism 6 drives the turntable 5 to rotate. The telescopic adjustment of the No. 3 telescopic rod 43 makes the detection device 71 on the base 7 coincide with the welding line. At the same time, the turntable 5 drives the No. 3 telescopic rod 43 to rotate. The No. 3 telescopic rod 43 rotates and retracts to make the base 7 move in a circle along the inner wall of the tank so that the detection device 71 detects the welding line. During the detection process, there is a gap between the probe and the weld. The coupling agent is applied by the brush wheel 72. At the same time, the main body is connected to the base 7 by connecting the support spring 10, so that the support spring 10 provides a downward force to make the probe fit the welding line, and can also squeeze the coupling agent to avoid the gap between the probe and the weld during the detection process, thereby ensuring the accuracy of the detection.

[0050] Before encountering the intersecting welding line, the left and right side number one wheel rods 841 are in a locked state, the number two wheel rod 842 is in an unlocked state, the left contact portion 98 of the number one feeler rod 91 is located at the front end of the number one wheel rod 841, and the contact surface 95 of the left contact portion 98 contacts the inner wall of the tank body, the right contact portion 98 of the number one feeler rod 91 is located between the number one wheel rod 841 and the number two wheel rod 842, the left contact portion 98 of the number two feeler rod 92 is located between the number two wheel rod 842 and the number one wheel rod 841, and the contact surface 95 on the left contact portion 98 contacts the inner wall of the tank body, and the right contact portion 98 of the number two feeler rod 92 is located at the rear side of the number one wheel rod 841.

[0051] When passing the welding line, the left contact portion 98 of the front No. 1 contact rod 91 contacts the welding line, and the contact arm portion 97 is lifted under the action of the contact surface 95, and the rocker arm portion 96 swings, driving the block 82 to move in the guide groove 811, and the block 82 is separated from the groove 843 on the front No. 1 wheel rod 841, and the locked state of the No. 1 wheel rod 841 is changed to the unlocked state, and the length of the telescopic spring 83 from the locked state is stretched, and when the block 82 leaves the groove 843, the telescopic spring 83 contracts, driving the front No. 1 wheel rod 84 1 and the rotating wheel 85 are lifted, and when the block 82 leaves the slot 843 of the front number one wheel rod 841, the other end of the block 82 fits into the slot 843 on one side of the number two wheel rod 842. Through the facing action of the side inclined surface of the block 82 and the slot 843, the lateral movement of the block 82 is converted into the downward movement of the number two wheel rod 842, the telescopic spring 83 is stretched, and the number two wheel rod 842 is converted from the unlocked state to the locked state, and the rotating wheel 85 contacts the tank wall to provide an upward supporting force to the base 7 through the bracket 81.

[0052] When the front end No. 1 wheel rod 841 crosses the cross-border welding line, the welding line comes between the front end No. 1 wheel rod 841 and the No. 2 wheel rod 842. At this time, the welding line contacts the right side contact portion 98 of the front end No. 1 contact rod 91. Under the action of the contact surface 95, the contact arm portion 97 is lifted, and the rocker arm portion 96 swings, driving the clamping block 82 to move in the guide groove 811, and the clamping block 82 leaves the clamping groove 843 of the No. 2 wheel rod 842. The locked state of the No. 2 wheel rod 842 is changed to the unlocked state, and the telescopic spring 83 contracts to drive the No. 2 wheel rod 842 to move. The wheel rod 842 and the rotating wheel 85 are lifted, and at the same time, the block 82 is fitted with the slot 843 of the front end number one wheel rod 841, and the unlocked state of the front end number one wheel rod 841 is changed to the locked state. Through the action of the side inclined surface of the block 82 and the slot 843 facing each other, the lateral movement of the block 82 is converted into the downward movement of the front end number one wheel rod 841, and the rotating wheel 85 follows the front end number one wheel rod 841 to descend and contact the inner wall of the tank body. The rotating wheel 85 contacts the tank wall to provide an upward supporting force to the base 7 through the bracket 81.

[0053] Continuing forward, when the No. 2 wheel rod 842 crosses the welding line and the welding line comes between the No. 2 wheel rod 842 and the No. 1 wheel rod 841 at the rear end, the welding line contacts the left contact portion 98 of the No. 2 contact rod 92. Under the action of the contact surface 95, the contact arm portion 97 is lifted, the rocker arm portion 96 swings, and the connecting rod 93 swings. The connecting rod 93 drives the block 82 to move in the guide groove 811, and the block 82 leaves the No. 1 slot 843 at the rear end. The locked state of the No. 1 wheel rod 841 at the rear end is changed to the unlocked state. The length of the telescopic spring 83 from the locked state is stretched. When the block 82 leaves the slot When the retractable spring 83 is in the state of being pulled back, the retractable spring 83 contracts, driving the front number one wheel rod 841 and the rotating wheel 85 to be lifted. When the block 82 leaves the slot 843 of the rear number one wheel rod 841, the other end of the block 82 fits into the slot 843 on one side of the number two wheel rod 842. Through the facing action of the side inclined surface of the block 82 and the slot 843, the lateral movement of the block 82 is converted into the downward movement of the number two wheel rod 842. The retractable spring 83 is stretched, and the number two wheel rod 842 is converted from the unlocked state to the locked state. The rotating wheel 85 contacts the tank wall and provides an upward supporting force to the base 7 through the bracket 81.

[0054] When the rear end No. 1 wheel rod 841 passes over the welding line, the welding line contacts the right side contact portion 98 of the No. 2 contact rod 92, and the contact arm portion 97 is lifted under the action of the contact surface 95, and the rocker arm portion 96 swings, driving the connecting rod 93 to swing, and the block 82 of the connecting rod 93 moves in the guide groove 811. When the block 82 leaves the slot 843 of the rear end No. 1 wheel rod 841, the locked state of the No. 2 wheel rod 842 is changed to the unlocked state, and the length of the telescopic spring 83 from the locked state is stretched. When the block 82 leaves the slot 843, the telescopic spring 83 contracts. The second wheel rod 842 and the rotating wheel 85 are lifted up, and the other end of the block 82 is fitted into the slot 843 of the rear number one wheel rod 841. Through the facing action of the side inclined surface of the block 82 and the slot 843, the lateral movement of the block 82 is converted into the downward movement of the rear number one wheel rod 841, the telescopic spring 83 is stretched, and the rear number one wheel rod 841 is converted from an unlocked state to a locked state, and the rotating wheel 85 contacts the tank wall to provide an upward supporting force to the base 7 through the bracket 81. In the above process, the detection probe keeps detecting the welding line.

[0055] A specific embodiment of the present invention is described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above described embodiment. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments without departing from the principles and ideas of the present invention should still fall within the scope of protection of the present invention.

Claims

1. A metal tank welding defect ultrasonic detection detector, comprising a fixing frame (1), a fixing ring (2), a steering mechanism (3), a first telescopic rod (41), a second telescopic rod (42), a turntable (5), a third telescopic rod (43), a torsion mechanism (6), a base (7), a detection device (71), a bracket (81), a support rod (84) and a rotating wheel (85), wherein the outer ring of the fixing frame (1) is provided with a fixing ring (2), the center of the fixing frame (1) is provided with a steering mechanism (3), and the steering mechanism ( 3) is connected to one end of a No. 1 telescopic rod (41), the other end of the No. 1 telescopic rod (41) is hinged to one end of a No. 2 telescopic rod (42), the other end of the No. 2 telescopic rod (42) is connected to a torsion mechanism (6), the torsion mechanism (6) is rotatably connected to the center of the turntable (5), the side wall of the turntable (5) is evenly connected with a plurality of No. 3 telescopic rods (43), the other end of the No. 3 telescopic rod (43) is connected to a base (7), and a detection device (71) is installed at the center of the lower end surface of the base (7), characterized in that: The support (81) is provided with a driving assembly (8) and a trigger assembly (9), the driving assembly (8) comprising a support (81), a support rod (84) and a rotating wheel (85), the support (81) is mounted on both sides of the base (7), the support rod (84) is movably mounted on the support (81), one end of the support rod (84) is rotatably mounted with a rotating wheel (85), the trigger assembly (9) locks the support rod (84) or releases the locking of the support rod (84) according to the flatness of the tank body, and the driving assembly (8) is used to lift the support rod (84) when the trigger assembly (9) releases the locking of the support rod (84).

2. The metal tank welding defect ultrasonic detection detector according to claim 1 is characterized in that: The driving assembly (8) comprises a telescopic spring (83) and a clamping block (82); the support rod (84) comprises a number one wheel rod (841) and a number two wheel rod (842); the number one wheel rod (841) is symmetrically mounted at both ends of the bracket (81); a clamping groove (843) is provided on one side of the number one wheel rod (841); a number two wheel rod (842) is mounted on the bracket (81); the number two wheel rod (842) is located between the two number one wheel rods (841); clamping grooves (843) are symmetrically provided on both sides of the number two wheel rod (842); the clamping grooves (843) on the number one wheel rod (841) are arranged on the two sides of the number two wheel rod (842); ) toward the No. 2 wheel rod (842), a telescopic spring (83) is coaxially mounted on the No. 1 wheel rod (841) and the No. 2 wheel rod (842), two ends of the telescopic spring (83) are respectively connected to the No. 1 wheel rod (841) and the No. 2 wheel rod (842) and the bracket (81), a guide groove (811) is horizontally opened on the bracket (81) between the No. 2 wheel rod (842) and the two No. 1 wheel rods (841), a clamping block (82) is slidably mounted in the guide groove (811), two ends of the clamping block (82) are matched with the clamping groove (843), and the trigger assembly (9) is connected to the clamping block (82).

3. The metal tank welding defect ultrasonic detection detector according to claim 2 is characterized in that: The trigger assembly (9) comprises a first touch rod (91), a second touch rod (92) and a connecting rod (93); the first touch rod (91) and the second touch rod (92) are symmetrically hinged on the bracket (81); the first touch rod (91) and the second touch rod (92) are respectively located between the first wheel rod (841) and the second wheel rod (842); the connecting rod (93) is hinged on the bracket (81); one end of the first touch rod (91) and the second touch rod (92) is provided with a sliding groove (94); the first touch rod (91) is slidably hinged to the block (82) through the sliding groove (94); one end of the connecting rod (93) is hinged to the block (82), and the other end is slidably installed in the sliding groove (94) of the second touch rod (92).

4. The metal tank welding defect ultrasonic detection detector according to claim 3 is characterized in that: The touch rod comprises a rocker arm portion (96), a touch arm portion (97) and a contact portion (98); the rocker arm portion (96) is centrally connected to the touch arm portion (97); the rocker arm portion (96) and the touch arm portion (97) are connected to form a Y-shape; a slide groove (94) is provided on the rocker arm portion (96); and the two ends of the touch arm portion (97) are connected to the contact portions (98).

5. The metal tank welding defect ultrasonic detection detector according to claim 4 is characterized in that: The contact arm portion (97) is V-shaped on both sides.

6. The metal tank welding defect ultrasonic detection detector according to claim 5 is characterized in that: The contact portion (98) is fan-shaped, and a contact surface (95) is provided at the bottom of the contact portion (98), and the contact surface (95) is located on the fan-shaped arc surface.

7. The metal tank welding defect ultrasonic detection detector according to claim 2 is characterized in that: The clamping block (82) is in the shape of an inverted trapezoid, and both ends of the clamping block (82) are provided with a self-slip coating (821).

8. The metal tank welding defect ultrasonic detection detector according to claim 3 is characterized in that: A pinhole (812) is provided in the guide groove (811), a card pin (813) is slidably installed in the pinhole (812), a compression spring (814) is connected between the card pin (813) and the bottom of the pinhole (812), and a plurality of pin slots (822) are provided in the card block (82), and the card pin (813) cooperates with the pin slots (822).

9. An ultrasonic detection probe for use in the metal tank welding defect ultrasonic detection detector according to any one of claims 1 to 8, characterized in that: It comprises a body and a support spring (10), wherein the body is connected to a base (7) via the support spring (10).

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