An automatic flaw detection device for dish-shaped castings

Abstract

The present application relates to an automatic flaw detection device for disc-shaped castings, including a flaw detection component and a fixed tooling for fixing butterfly castings, the flaw detection component including an ultrasonic generator, an ultrasonic sensor, a flaw detection component main equipment and a detection movable part, the ultrasonic generator and the ultrasonic sensor are integrated in the detection movable part, the detection movable part can move laterally to perform flaw detection on the workpiece to be inspected, the fixed tooling includes a support frame and a fixed frame, the fixed frame can slide relative to the support frame to make way for its current space, the detection movable part is connected to a first contact detection sensor, the support frame is provided with a driving component for driving the fixed frame to slide, the driving component is connected to the first contact detection sensor and responds to the trigger signal of the first contact detection sensor, and makes way and moves under the action of the trigger signal. This application has the technical effect of improving detection accuracy and simplifying the detection method.

Description

Technical Field

[0001] The present application relates to the technical field of ultrasonic flaw detection, and in particular to an automatic flaw detection device for dish-shaped castings. Background Art

[0002] Ultrasonic flaw detection uses the ability of ultrasound to penetrate deep into metal sheets and reflect at the interface when passing from one cross section to another to detect defects in parts. Ultrasonic flaw detection can quickly, conveniently, non-destructively, and accurately detect, locate, evaluate, and diagnose a variety of internal defects in metal sheet workpieces (including longitudinal and transverse cracks, porosity, pores, and slag inclusions). It can be used both in the laboratory and on-site.

[0003] When the existing ultrasonic flaw detection device for metal plates is in use, the ultrasonic probe is usually controlled by the detection device to perform detection. When the detection device performs detection at the same time, the workpiece to be detected must first be fixed to keep it stable during the entire detection process. At this time, if the butterfly part is to be detected, because the butterfly part is an irregular geometric body, if stable fixation is required, a larger area must be covered for fixation. However, the tooling assembly used to fix the workpiece to be detected will block the detection device probe from detecting the blocked area, and thus the overall detection image of the metal plate cannot be formed. At this time, the undetected part can only be detected after clamping again, which is very cumbersome. Summary of the Invention

[0004] In order to solve the above technical problems, the present application provides an automatic flaw detection device for dish-shaped castings.

[0005] This application provides an automatic flaw detection device for dish-shaped castings, which adopts the following technical solution:

[0006] A dish-shaped casting automatic flaw detection device includes a flaw detection component and a fixed tool for fixing the butterfly casting, the flaw detection component includes an ultrasonic generator, an ultrasonic sensor, a flaw detection component main device and a detection movable part, the ultrasonic generator and the ultrasonic sensor are integrated in the detection movable part, the detection movable part can move laterally to detect the workpiece to be inspected, the fixed tool includes a support frame and a fixed frame, the fixed frame can slide relative to the support frame to make way for its current space, the detection movable part is connected to a first contact detection sensor, and the support frame is provided with a drive component for driving the fixed frame to slide, the drive component is connected to the first contact detection sensor and responds to the trigger signal of the first contact detection sensor, and makes way and moves under the action of the trigger signal.

[0007] By adopting the above technical solution, the detection movable part is integrated with an ultrasonic generator and an ultrasonic sensor, so that an ultrasonic signal can be emitted by the ultrasonic generator. After the ultrasonic signal contacts the workpiece to be inspected, it returns and is received by the ultrasonic sensor, and then the signal is transmitted to the main equipment of the flaw detection component, so that the damage image of the entire workpiece to be inspected can be obtained. Since only a fixed tool is set to fix the workpiece to be inspected, at this time, from the side of the workpiece to be inspected, only a vertical rod-shaped part is blocked. When the detection movable part moves to this part during the lateral movement, the first contact detection sensor will contact the fixed frame and generate a trigger signal. At this time, the fixed frame can be driven to move by the driving component. The fixed frame will still stably support the workpiece to be inspected during the movement. After the movement is completed, the detection movable part can continue to move. In this way, the side of the entire workpiece to be inspected can be detected. There is actually no obstruction during the entire detection process, thereby improving the detection efficiency.

[0008] Preferably, the support frame includes a base and a vertical support seat detachably connected to the base, the fixing frame includes a sliding plate slidably connected to the base, the sliding plate is provided with a hinged rod that can abut against the side of the workpiece to be detected, a fixing rod is provided between the hinged rod and the workpiece to be detected, the other end of the fixing rod is fixedly connected to the sliding plate, and the fixing rod is provided with a positioning assembly that can abut against the upper inclined surface of the hinged rod to control the hinged rod to tightly abut against the side of the workpiece to be detected; the positioning assembly includes a counterweight positioning ball and a nut assembly threadedly connected to the upper end of the fixing rod, and the nut assembly is located above the counterweight positioning ball.

[0009] By adopting the above technical solution, specifically, when the workpiece to be inspected is placed on the base, the hinged rod can be rotated to make it contact the side of the workpiece to be inspected. At this time, the hinged rod can be pressed downward by the positioning assembly. At this time, the hinged rod and the vertical support seat cooperate with each other to provide stable support for the workpiece to be inspected. The specific method is to give an inclined pressure downward to the hinged rod through the counterweight positioning ball, and then make it contact above the counterweight positioning ball by rotating the nut assembly, so as to achieve stable fixation and facilitate the next step of inspection.

[0010] Preferably, the articulated rod includes a first articulated rod and a second articulated rod, the first articulated rod and the second articulated rod are parallel to each other, the rotating frame is divided into two parts and are respectively hinged to the first articulated rod and the second articulated rod, the sliding plates are two groups and correspond to the first articulated rod and the second articulated rod respectively, and a threaded screw is rotatably connected on the base, and the two pairs of thread parts of the threaded screw are respectively threadedly connected to the two sliding plates; when the contact end of the first contact detection sensor detects that it does not contact the first articulated rod or the second articulated rod, it can control the displacement of the detection movable part, a first contact area is provided on the side of the first articulated rod, and a second contact detection sensor is provided at the first contact area, and when the second contact detection sensor receives a signal, it controls the threaded screw to rotate to control the first articulated rod and the second articulated rod to move away from each other, a second contact area is provided on the side of the second articulated rod, and a second contact detection sensor is provided at the second contact area, and when the second contact detection sensor receives a signal, it controls the threaded screw to rotate to control the first articulated rod and the second articulated rod to move closer to each other.

[0011] By adopting the above technical solution, when the first contact detection sensor does not contact the first hinged rod or the second hinged rod, it is proved that there is no obstruction in the current detection area of ​​the detection movable member, and detection can continue. When the sensing end of the first contact detection sensor contacts the first hinged rod, the second contact detection sensor on the first hinged rod is also triggered synchronously. At this time, the threading screw will rotate, driving the first hinged rod and the second hinged rod to move away from each other. During the process of moving away, the sensing end of the first contact detection sensor always contacts the first contact area, and thus the detection movable member will not move. When the first hinged rod moves away, the detection movable member can continue to move. When the detection movable member contacts the second hinged rod, it can also trigger the threading screw to reverse, thereby controlling the first hinged rod and the second hinged rod to move closer to each other. When they are separated, the detection movable member continues to move, thereby achieving detection of the entire area. At the same time, due to the presence of the counterweight positioning ball, when the first hinged rod and the second hinged rod approach or move away from each other, they will always be stably pressed against the side of the workpiece to be detected under the action of the counterweight positioning ball, thereby achieving stable fixation of the workpiece to be detected without the need for manual intervention.

[0012] Preferably, the vertical support seat includes a vertical support frame and a support plate fixedly connected to the vertical support frame. The vertical support frame and the support plate are both hollow structures and are interconnected. The vertical support frame is provided with a cooling water inlet and a cooling water outlet.

[0013] By adopting the above technical solution, a hollow structure is set up and a cooling water inlet and outlet are set up in the hollow structure. When the ultrasonic generator generates an ultrasonic signal, high-frequency vibration is generated, which causes the metal plate to heat up. By setting cooling water, partial cooling can be achieved, making it easier for the operator to move the workpiece after the inspection is completed.

[0014] Preferably, a plurality of cooling holes are provided on the top of the vertical support frame, and control valves for closing or opening the cooling holes are provided at the cooling holes.

[0015] By adopting the above technical solution and setting cooling holes, when the workpiece needs to be removed after the entire inspection is completed, some cooling water can be sprayed through the cooling holes, so that the workpiece can be cooled quickly after the entire inspection is completed, which is convenient for subsequent operations.

[0016] Preferably, a plurality of channels are provided inside the vertical support frame, a plurality of throttling blocks are provided in the channels, a gap for the water supply channel is left between the throttling blocks and the inner side of the channels, and the throttling blocks are made of rubber and are deformable when heated.

[0017] Preferably, throttle plates are provided on both sides of the throttle block, the throttle block protrudes from the throttle plate, the throttle plate is made of heat-insulating material, an opening is provided on the vertical support frame at a position corresponding to the throttle block, and a heat conducting plate is fixedly connected to the opening.

[0018] By adopting the above technical solution, a throttling block is set up, so that the water flow space of the entire channel is thinner, and the water flow is concentrated and stored between two adjacent throttling blocks. When the detection movable part moves for detection, high temperature will be generated in the detected area. At this time, the throttling block is deformed by heat, which can make the water flow quickly to the area, and the backflow will not flow out directly, which can effectively avoid the waste of cooling water resources.

[0019] Preferably, the top of the hinged rod is hinged with a rotating frame that can rotate relative to the hinged rod, the rotating axis of the rotating frame is parallel to the rotating axis of the hinged rod rotating relative to the sliding plate, and two rubber rods that can abut against the side of the workpiece to be detected are vertically arranged on the rotating frame.

[0020] Preferably, the rotating frame includes a rotating rod and a rotating bracket rotatably connected to the rotating rod, and the rubber rod is fixedly connected to the rotating bracket.

[0021] By adopting the above technical solution, the butterfly-shaped detection part is usually not easy to fix. By setting up a hinged rotating frame and arranging two rubber rods on the rotating frame that can contact the workpiece to be detected, the contact area of ​​the rubber rods can be effectively increased, three-point positioning can be achieved, and the workpiece to be detected can be stably supported.

[0022] Preferably, a resistance plate is slidably connected to the base in a direction close to the vertical support frame, and a transverse driving member is provided on the resistance plate to drive its movement. A pressure sensing sensor is provided on the rubber rod, and the pressure sensing sensor outputs a pressure sensing signal when sensing a pressure value. The transverse driving member responds to the pressure sensing signal and controls the resistance plate to move in a direction close to the vertical support frame when receiving the pressure sensing signal.

[0023] By adopting the above technical solution, by setting a resistance plate and responding to the signal of the pressure sensing sensor, the resistance plate and the rubber rod work together to stably fix the workpiece to be inspected on the support frame, which makes the operation simpler and more convenient.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. The detection movable part is integrated with an ultrasonic generator and an ultrasonic sensor, so that an ultrasonic signal can be emitted through the ultrasonic generator. After the ultrasonic signal contacts the workpiece to be inspected, it returns and is received by the ultrasonic sensor. The signal is then transmitted to the flaw detection component main equipment, so that the damage image of the entire workpiece to be inspected can be obtained. Since only a fixed tool is set to fix the workpiece to be inspected, at this time, from the side of the workpiece to be inspected, only a vertical rod-shaped part is blocked. When the detection movable part moves to this part during the lateral movement, the first contact detection sensor will contact the fixed frame, which will generate a trigger signal. At this time, the fixed frame can be driven to move by the driving component. The fixed frame will still stably support the workpiece to be inspected during the movement. After the movement is completed, the detection movable part can continue to move. This method can detect the side of the entire workpiece to be inspected. There is actually no obstruction during the entire detection process, which improves the detection efficiency.

[0026] 2. When the first contact detection sensor does not contact the first hinged rod or the second hinged rod, it proves that there is no obstruction in the current detection area of ​​the detection movable part, and detection can continue. When the sensing end of the first contact detection sensor contacts the first hinged rod, the second contact detection sensor on the first hinged rod will also be triggered synchronously. At this time, the threaded screw will rotate, driving the first hinged rod and the second hinged rod to move away from each other. During the process of moving away, the sensing end of the first contact detection sensor always contacts the first contact area, and then the detection movable part will not move at this time. When the first hinged rod moves and disengages, the detection movable part can continue to move. When the detection movable part contacts the second hinged rod, it can also trigger the threaded screw to reverse, thereby controlling the first hinged rod and the second hinged rod to approach each other. When disengaged, the detection movable part continues to move, thereby realizing detection of the entire area.

[0027] 3. When the workpiece to be inspected is placed on the base, the hinged rod can be rotated to make it contact the side of the workpiece to be inspected. At this time, the hinged rod can be pressed downward by the positioning assembly. At this time, the hinged rod and the vertical support seat cooperate with each other to stably support the workpiece to be inspected. The specific method is to give the hinged rod an inclined pressure downward through the counterweight positioning ball, and then make it contact the top of the counterweight positioning ball by rotating the nut assembly, so as to achieve stable fixation and facilitate the next step of inspection; at the same time, due to the presence of the counterweight positioning ball, the first hinged rod and the second hinged rod will always be stably in contact with the side of the workpiece to be inspected under the action of the counterweight positioning ball during the process of approaching or moving away from each other, so as to achieve stable fixation of the workpiece to be inspected without the need for manual intervention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 1 is a schematic diagram of the overall structure of the embodiment;

[0029] Figure 2 is a structural diagram highlighting the connection between the first hinged rod and the second hinged rod in the embodiment;

[0030] Figure 3 is a schematic diagram highlighting the position of the contact detection sensor in the embodiment;

[0031] Figure 4 is a schematic diagram highlighting the signal transmission direction of the contact detection sensor in the embodiment;

[0032] Figure 5 This is a schematic structural diagram highlighting the vertical support seat in the embodiment;

[0033] Figure 6 It is a schematic diagram highlighting the structure of the throttling block inside the channel in the embodiment.

[0034] Explanation of reference numerals: 1. flaw detection assembly; 11. ultrasonic generator; 12. ultrasonic sensor; 13. flaw detection assembly main unit; 14. detection movable part; 141. first contact detection sensor; 142. second contact detection sensor; 143. third contact detection sensor; 2. fixing fixture; 21. support frame; 211. base; 2111. contact plate; 212. vertical support seat; 2121. vertical support frame; 2122. support plate; 2123. cooling water inlet; 2124. cooling water outlet 2125, cooling hole; 2126, channel; 2127, throttle block; 2128, heat conduction plate; 2129, throttle plate; 213, reinforcing rod; 22, fixing frame; 221, sliding plate; 222, hinged rod; 2221, first hinged rod; 2222, second hinged rod; 23, slide groove; 231, threading screw; 232, driving motor; 24, fixing rod; 241, counterweight positioning ball; 242, nut assembly; 25, rotating frame; 251, rotating rod; 252, rotating bracket; 253, rubber rod. DETAILED DESCRIPTION

[0035] The following is combined with Figure 1-6 This application is described in further detail.

[0036] The embodiment of the present application discloses an automatic flaw detection device for dish-shaped castings. Figure 1 , including a flaw detection component 1 and a fixed tooling 2 for fixing a butterfly casting; the flaw detection component 1 includes an ultrasonic generator 11, an ultrasonic sensor 12, a flaw detection component main equipment 13 and a detection movable part 14, wherein the ultrasonic generator 11 and the ultrasonic sensor 12 are integrated on the detection movable part 14, and the detection movable part 14 can be installed on a prefabricated transverse rod, so that the entire detection movable part 14 can move horizontally to scan the workpiece to be inspected, and the detection movable part 14 can be driven to move by an electric hydraulic cylinder.

[0037] Reference Figure 1 and Figure 2The fixing tool 2 includes a support frame 21 and a fixing frame 22. The support frame 21 includes a base 211 and a vertical support seat 212. The base 211 and the vertical support seat 212 are detachably connected by bolts. A reinforcing rod 213 is provided on the back side of the vertical support seat 212. One end of the reinforcing rod 213 is fixedly connected to the vertical support seat 212, and the other end is fixedly connected to the base 211. The fixing frame 22 is arranged at the front position of the vertical support seat 212; the fixing frame 22 includes a sliding plate 221 and a hinged rod 222, wherein the hinged rod 222 includes a first hinge that fits each other. The connecting rod 2221 and the second hinge rod 2222 are provided with a horizontal slide groove 23 on the base 211. The sliding plates 221 are divided into two groups and are arranged in the slide groove 23. The sliding plates 221 can slide in the slide groove 23. A threading screw 231 is also provided in the slide groove 23. The two sliding plates 221 are respectively threadedly connected to the two sides of the threading screw 231, so that when the threading screw 231 rotates, the two sliding plates 221 can be driven to move closer to or away from each other. A driving motor 232 is provided in the slide groove 23, and the output shaft of the driving motor 232 is coaxially fixedly connected to the threading screw 231.

[0038] The first hinge rod 2221 and the second hinge rod 2222 are respectively hingedly set on the corresponding sliding plate 221. A through strip groove is set at the middle of the first hinge rod 2221 and the second hinge rod 2222. A fixing rod 24 is inserted into the strip groove. The bottom of the fixing rod 24 is fixedly connected to the corresponding sliding plate 221 so that the fixing plate can move with the sliding plate 221. A positioning assembly is set at the upper end of the fixing rod 24. The positioning assembly includes a counterweight positioning ball 241 and a threaded connection to the fixed rod 24. The nut assembly 242 at the upper end of the rod 24 is located above the counterweight positioning ball 241; a rotating frame 25 that can rotate relative to the first hinged rod 2221 and the second hinged rod 2222 is hingedly connected to the upper ends thereof, and the rotating axis of the rotating frame 25 is parallel to the rotating axis of the hinged rod 222 rotating relative to the sliding plate 221. The rotating frame 25 includes a rotating rod 251 and a rotating bracket 252 rotatably connected to the rotating rod 251, and two rubber rods 253 are fixedly connected vertically to the rotating bracket 252.

[0039] Reference Figure 1 and Figure 3A first contact detection sensor 141 is provided on the detection movable part 14, a second contact detection sensor 142 is provided on the first hinge rod 2221 at a position corresponding to the first contact detection sensor 141, and a third contact detection sensor 143 is provided on the second hinge rod 2222 at a position corresponding to the first contact detection sensor 141, wherein the sensing ends of the second contact detection sensor 142 and the third contact detection sensor 143 both cover the side annular position of the corresponding hinge rod 222, so as to form a first contact area corresponding to the second contact detection sensor 142 and a second contact area corresponding to the third contact detection sensor 143; the sensing end of the first contact detection sensor 141 protrudes from the detection movable part 14 and can contact the first contact area and the second contact area.

[0040] Reference Figure 1 and Figure 4 When the first contact detection sensor 141 does not contact the first contact area or the second contact area, the detection movable part 14 is driven to move by the electric hydraulic cylinder, and then the flaw detection work is started from one side. There is no obstruction during the flaw detection process. When the first contact detection sensor 141 touches the first contact area, the first contact detection sensor 141 will feedback a low-level signal, thereby controlling the electric hydraulic cylinder to stop the action. At this time, since the first contact area is the sensing end of the second contact detection sensor 142, a high-level signal can be output through the second contact detection sensor 142, thereby controlling the drive motor 232 to rotate, so that the first hinge rod 2221 and the second hinge rod 2222 move away from each other. In the process of the first hinge rod 2221 and the second hinge rod 2222 moving away from each other, under the downward gravity of the counterweight positioning ball 241, the rubber rod 253 will still contact the side of the workpiece to be detected, and no manual operation is required. It can also achieve stable fixation and improve efficiency; during the operation of the drive motor 232, the first contact detection sensor 141 always contacts the first contact area until it is separated. When the first contact detection sensor 141 is separated from the first contact area, the first contact detection sensor 141 outputs a high-level signal to control the detection movable part 14 to continue moving for detection. When the first contact detection sensor 141 contacts the second contact area, the electric hydraulic cylinder stops working. At this time, the third contact detection sensor 143 outputs a high-level signal to control the drive motor 232 to reverse and thus make the first hinged rod 2221 and the second hinged rod 2222 approach each other until the sensing end of the first contact detection sensor 141 is separated from the second contact area. At this time, the first contact detection sensor 141 outputs a high-level signal to control the electric hydraulic cylinder to continue working, thereby completing the flaw detection work of the workpiece to be detected, and effectively avoiding obstruction during the entire flaw detection process.

[0041] A resistance plate 2111 is slidably connected to the base 211 in a direction close to the vertical support frame 2121. A transverse driving member is provided on the resistance plate 2111 to drive its movement. A pressure sensing sensor is provided on the rubber rod 253. The pressure sensing sensor outputs a pressure sensing signal when sensing a pressure value. The transverse driving member responds to the pressure sensing signal and controls the resistance plate 2111 to move in a direction close to the vertical support frame 2121 when receiving the pressure sensing signal. The transverse driving member can be a cylinder.

[0042] Reference Figure 5 and Figure 6 The vertical support seat 212 includes a vertical support frame 2121 and a support plate 2122 fixedly connected to the vertical support frame 2121. The vertical support frame 2121 and the support plate 2122 are both hollow structures and are interconnected. A cooling water inlet 2123 and a cooling water outlet 2124 are provided on the vertical support frame 2121. A plurality of cooling holes 2125 are provided on the top of the vertical support frame 2121. A control valve for closing or opening the cooling holes 2125 is provided. A plurality of channels 2126 are provided inside the vertical support frame 2121. 126. A plurality of throttling blocks 2127 are provided in the channel 2126. A gap for the water supply channel 2126 is left between the throttling blocks 2127 and the inner side of the channel 2126. The throttling blocks 2127 are made of rubber and are deformable when heated. Throttle plates 2129 are provided on both sides of the throttling blocks 2127. The throttling blocks 2127 protrude from the throttle plates 2129. The throttle plates 2129 are made of heat-insulating material. An opening is provided on the vertical support frame 2121 at a position corresponding to the throttling block 2127, and a heat-conducting plate 2128 is fixedly connected to the opening.

[0043] The provision of the support plate 2122 can effectively increase the contact area. When flaw detection is performed step by step from left to right by detecting the movable part 14, cooling water can be injected into the cooling water inlet 2123 on the left. At this time, due to the presence of the throttling block 2127, there is only a very fine gap in each channel 2126 for water to flow through. As the ultrasonic generator 11 works, the surface temperature of the workpiece to be inspected increases, which in turn drives the throttling block 2127 to deform due to heat, causing the gap at the corresponding position to become larger, allowing water to pass through, thereby increasing the cooling area of ​​the water flow, so that the temperature of the detection area can be reduced to a certain extent, and only the contact cross-section of the detection area will increase, which can effectively save resources.

[0044] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. An automatic flaw detection device for dish-shaped castings, characterized by: The invention comprises a flaw detection component (1) and a fixing fixture (2) for fixing a butterfly casting, wherein the flaw detection component (1) comprises an ultrasonic generator (11), an ultrasonic sensor (12), a flaw detection component main unit (13) and a detection movable part (14), wherein the ultrasonic generator (11) and the ultrasonic sensor (12) are integrated into the detection movable part (14), and the detection movable part (14) can move laterally to perform flaw detection on a workpiece to be detected, wherein the fixing fixture (2) comprises a support frame (21) and a fixing frame (22), wherein the fixing frame (22) can slide relative to the support frame (21) to make way for the space in which it is currently located, and wherein the detection movable part (14) is connected to a first A contact detection sensor (141), the support frame (21) is provided with a driving component for driving the fixed frame (22) to slide, the driving component is connected to the first contact detection sensor (141) and responds to the trigger signal of the first contact detection sensor (141), and moves under the action of the trigger signal; the fixed frame (22) includes a sliding plate (221), the sliding plate (221) is provided with a hinged rod (222) capable of contacting the side of the workpiece to be detected, a fixed rod (24) is provided between the hinged rod (222) and the workpiece to be detected, and the fixed rod (24) is provided with a control hinged rod (222) to tightly contact the workpiece to be detected. A positioning assembly for detecting the side of a workpiece, wherein the hinged rod (222) includes a first hinged rod (2221) and a second hinged rod (2222); the sliding plates (221) are divided into two groups and correspond to the first hinged rod (2221) and the second hinged rod (2222), respectively; a threaded screw rod (231) is rotatably connected to the base (211), and two threaded parts of the threaded screw rod (231) are respectively threadedly connected to the two sliding plates (221); a first contact area is provided on the side of the first hinged rod (2221), and a second contact detection sensor (142) is provided at the first contact area, and the second contact detection sensor (142) receives When a signal is received, the thread-matching screw (231) is controlled to rotate to control the first hinge rod (2221) and the second hinge rod (2222) to move away from each other; a second contact area is provided on the side of the second hinge rod (2222); a third contact detection sensor (143) is provided at the second contact area; when the third contact detection sensor (143) receives a signal, the thread-matching screw (231) is controlled to rotate to control the first hinge rod (2221) and the second hinge rod (2222) to move closer to each other; the second contact detection sensor (142) and the third contact detection sensor (143) are both provided at the position corresponding to the first contact detection sensor (141).

2. The automatic flaw detection device for dish-shaped castings according to claim 1, characterized in that: The support frame (21) includes a base (211) and a vertical support seat (212) detachably connected to the base (211); the sliding plate (221) is slidably connected to the base (211); the lower end of the fixed rod (24) is fixedly connected to the sliding plate (221); the positioning assembly includes a counterweight positioning ball (241) and a nut assembly (242) threadedly connected to the upper end of the fixed rod (24); the nut assembly (242) is located above the counterweight positioning ball (241).

3. The automatic flaw detection device for dish-shaped castings according to claim 2, characterized in that: The first hinged rod (2221) and the second hinged rod (2222) are parallel to each other, and when the contact end of the first contact detection sensor (141) detects that it is not in contact with the first hinged rod (2221) or the second hinged rod (2222), the displacement of the detection movable part (14) can be controlled.

4. The automatic flaw detection device for dish-shaped castings according to claim 2, characterized in that: The vertical support seat (212) comprises a vertical support frame (2121) and a support plate (2122) fixedly connected to the vertical support frame (2121); the vertical support frame (2121) and the support plate (2122) are both hollow structures and are interconnected; and a cooling water inlet (2123) and a cooling water outlet (2124) are provided on the vertical support frame (2121).

5. The automatic flaw detection device for dish-shaped castings according to claim 4, characterized in that: The top of the vertical support frame (2121) is provided with a plurality of cooling holes (2125), and the cooling holes (2125) are provided with control valves for closing or opening them.

6. The automatic flaw detection device for dish-shaped castings according to claim 4, characterized in that: A plurality of channels (2126) are provided inside the vertical support frame (2121), a plurality of throttling blocks (2127) are provided inside the channels (2126), a gap for the water flow channel (2126) is left between the throttling blocks (2127) and the inner side of the channels (2126), and the throttling blocks (2127) are made of rubber and are deformable when heated.

7. The automatic flaw detection device for dish-shaped castings according to claim 6, characterized in that: Throttle plates (2129) are provided on both sides of the throttle block (2127), the throttle block (2127) protrudes from the throttle plate (2129), and the throttle plate (2129) is made of a heat-insulating material. An opening is provided on the vertical support frame (2121) at a position corresponding to the throttle block (2127), and a heat-conducting plate (2128) is fixedly connected to the opening.

8. The automatic flaw detection device for dish-shaped castings according to claim 4, characterized in that: The top of the hinged rod (222) is hinged with a rotating frame (25) that can rotate relative to the hinged rod (222), the rotating axis of the rotating frame (25) and the rotating axis of the hinged rod (222) rotating relative to the sliding plate (221) are parallel to each other, and two rubber rods (253) that can contact the side of the workpiece to be detected are vertically arranged on the rotating frame (25).

9. The automatic flaw detection device for dish-shaped castings according to claim 8, characterized in that: The rotating frame (25) comprises a rotating rod (251) and a rotating bracket (252) rotatably connected to the rotating rod (251), and the rubber rod (253) is fixedly connected to the rotating bracket (252).

10. The automatic flaw detection device for dish-shaped castings according to claim 9, characterized in that: A resistance plate (2111) is slidably connected to the base (211) in a direction close to the vertical support frame (2121); a transverse driving member for driving the resistance plate (2111) to move is provided on the resistance plate (2111); a pressure sensing sensor is provided on the rubber rod (253); the pressure sensing sensor outputs a pressure sensing signal when sensing a pressure value; the transverse driving member responds to the pressure sensing signal and controls the resistance plate (2111) to move in a direction close to the vertical support frame (2121) when receiving the pressure sensing signal.

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