A ceramic internal defect detection device

Abstract

The present invention belongs to the field of ceramic detection technology, and discloses a ceramic internal defect detection device, including a base, a positioning part and a lifting mechanism, a detection component is provided above the base, and a connecting arm fixedly connected to the movable end of the lifting mechanism is fixed on the top of the detection component. The present invention realizes the formation of a surrounding detection zone inside the ceramic tube by using the detection component to move inside the ceramic tube, cooperating with the annular pressure detection cavity and the sealing component, and using the filling of pressurized air to pressurize the inner wall to be tested. With the cooperation of the pressure valve component and the rotating detection part, the obvious cracks, hidden cracks (cracks are squeezed and enlarged after pressure is applied) and thin-walled cavities existing inside the ceramic are synchronously detected. On the one hand, the detectable range is greatly improved, and on the other hand, the hidden defects are exposed in advance by amplifying the defects, and accurate and comprehensive internal defect detection can be completed without the use of high-end equipment.

Description

Technical Field

[0001] The invention belongs to the technical field of ceramic detection, and in particular relates to a device for detecting internal defects of ceramics. Background Art

[0002] Ceramics is a general term for pottery and porcelain. Ceramics are inorganic non-metallic materials made from natural silicate minerals such as clay, feldspar and quartz as the main raw materials, through processes such as molding, drying and sintering, and are widely used in various fields.

[0003] The patent document now published is CN11599337OA, which provides a device for measuring and detecting internal defects of ceramics, including: "a stand, the interior of the stand is provided with a storage space; supporting legs, the number of the supporting legs is four, and they are respectively arranged at the four corners of the bottom end of the stand; a lifting mechanism, the lifting mechanism is arranged at the top of the stand; a workbench, the workbench is arranged on the moving end of the lifting mechanism, and the interior of the workbench is arranged as a cavity mechanism; a clamping mechanism, the clamping mechanism is arranged at the top of the workbench; a detection mechanism, the detection mechanism is fixedly arranged at the top of the stand; a control mechanism, the control mechanism is arranged in the inner cavity of the workbench", which realizes flexible detection of the interior of the ceramics and the storage of the visual camera.

[0004] However, when solving the problem of internal defect detection of tubular ceramics, it is mainly carried out by inserting a visual camera into the interior of the ceramic for detection. The visual detection method can only realize the detection of surface shape and structure. For tiny cracks or thin-walled cavities, simple image capture technology cannot be effectively realized. When using ultrasonic scanning and industrial CT, the actual investment cost is huge, the maintenance cost is high, and it is impossible to realize simple and direct detection of the inside of the ceramic tube. The actual detection cost of various defects on the inner wall of the ceramic is high or the detection is difficult, and the comprehensive detection effect is not good. Summary of the invention

[0005] The object of the present invention is to provide a ceramic internal defect detection device to solve the problems raised in the above background technology.

[0006] In order to achieve the above-mentioned object, the present invention provides the following technical solutions: a ceramic internal defect detection device, comprising a base, a positioning part and a lifting mechanism, a detection assembly is arranged above the base, a connecting arm fixedly connected to a movable end of the lifting mechanism is fixedly arranged on the top of the detection assembly, and a ceramic tube to be tested is arranged on the top of the base;

[0007] The detection component detects step by step from top to bottom along the inside of the ceramic tube, and sealing components are provided at the upper and lower parts of the outer surface of the detection component. The sealing components are in contact with the inner wall of the ceramic tube and slide relatively. A rotating detection part is provided inside the detection component, and a fixed detection part is fixed on the top of the detection component and is sleeved on the outside of the rotating detection part. A high-pressure interval is formed inside the detection component, and when the set pressure is reached, the pressure air is bypassed and the rotating detection part is driven to rotate.

[0008] Preferably, the detection assembly includes a movable seat, a pressure detection chamber, an internal chamber, a pressure pump, a reversing valve and a pressure valve;

[0009] The movable seat is in an "I" shape and moves downward along the inside of the ceramic tube. The pressure detection cavity is located in the middle of the outer side of the movable seat. The pressure detection cavity is opened inside the movable seat. A mounting sleeve is fixed on the top of the movable seat.

[0010] The pressure pump is fixed on the top of the movable seat, the air outlet of the pressure pump passes through the top surface of the movable seat and extends into the pressure detection chamber and is fixedly installed with the reversing valve, and the pressure valve is installed in the pressure detection chamber and controls the connection between the pressure detection chamber and the internal chamber.

[0011] The set pressure of the pressure valve can be adjusted, and it opens when the pressure in the pressure detection chamber reaches the set value, bypassing the gas further into the internal chamber, thereby using the pressurized gas to push the blades. The reversing valve can realize the input of pressurized gas in different directions. On the one hand, it is used to realize high pressure detection, and on the other hand, it provides expansion power for the sealing component.

[0012] Preferably, the detection component further comprises purge holes, which are distributed around the bottom of the movable seat, and the upper ends of the plurality of groups of purge holes are inclined close to each other and communicated with the internal cavity.

[0013] Preferably, the sealing assembly comprises:

[0014] Elastic sealing rings, the number of which is two and which are distributed on the outer surface of the movable seat in the upper and lower parts, the elastic sealing rings are fixedly sleeved through the annular grooves provided on the outer surface of the movable seat, and the elastic sealing rings are symmetrically distributed on both sides of the pressure detection chamber;

[0015] A distribution pipe, the distribution pipe is fixedly sleeved between the two elastic sealing rings, the distribution pipe is fixedly connected to one end of the reversing valve, when the air pressure inside the elastic sealing ring reaches a set value, the reversing valve closes the passage leading to the elastic sealing ring, and opens the passage leading to the pressure detection chamber in a linked manner, when the air pressure inside the pressure detection chamber reaches a set value, the pressure valve that controls the pressure detection chamber to the internal chamber is opened;

[0016] The elastic sealing ring gradually deforms and expands due to the pressure when the interior is filled with pressurized air, and contacts and squeezes with the ceramic tube wall in the ceramic tube wall to complete the relative sealing process. Moreover, since the ceramic tube wall is clamped and fixed externally, the lifting mechanism drives the detection component downward and simultaneously drives the elastic sealing ring downward to achieve dynamic sealing.

[0017] Preferably, the fixed detection unit comprises:

[0018] A support tube, the support tube is fixedly sleeved on the top of the movable seat, a detachable positioning ring is provided on the top of the support tube, and a reserved cavity is provided inside the top of the support tube;

[0019] The reserved cavity is used for the reserved placement of the angular velocity sensor and provides installation space. The positioning ring on the top of the support tube facilitates the positioning of the auxiliary rod and maintains the rotation support of the auxiliary rod. The positioning ring facilitates the removal of the angular velocity sensor and maintenance and replacement after disassembly. The length of the auxiliary rod is preferably greater than the length of the ceramic tube, so that it is always convenient to observe from the top whether the auxiliary rod is rotating.

[0020] The visual detector is distributed around the outer surface of the support tube, and the inner wall of the ceramic tube is detected by using the visual detector distributed around.

[0021] The inner wall of the ceramic tube is inspected by using surrounding visual detectors, which are specifically image shooting devices, and each observation angle is greater than ° under equal spacing, ensuring comprehensive inspection of the inside of the ceramic.

[0022] The fixed inspection unit cooperates with the mounted visual detector to perform complete visual inspection during the downward movement process, obtain the image of the inner wall of the ceramic, and comprehensively complete defect detection.

[0023] Preferably, the rotary detection unit comprises:

[0024] A rotating shaft, the rotating shaft is rotatably mounted in the support tube through a bearing, a sealing ring is further provided between the rotating shaft and the support tube, and the lower end of the rotating shaft passes through the movable seat and extends to the bottom of the movable seat;

[0025] A blade, wherein the blade is fixedly sleeved on the rotating shaft, and the blade is located in the internal cavity and below the pressure valve;

[0026] An angular velocity sensor is fixed at the top of the rotating shaft and is located in a reserved cavity at the top of the support tube. The angular velocity sensor detects the speed of the rotating shaft and reflects the bypass air pressure acting on the blades in the internal cavity. An auxiliary rod is provided at the top of the angular velocity sensor, and the auxiliary rod passes through the support tube and extends upward for a distance.

[0027] Preferably, a cleaning part is provided at the bottom of the rotating detection part, and the cleaning part comprises:

[0028] A support ring, wherein the support ring is fixedly connected to the lower end of the rotating shaft through an inner connecting rod;

[0029] A cleaning brush is a wire brush, and the cleaning brush is fixedly arranged on the outer surface of the support ring and distributed around.

[0030] Preferably, the positioning portion is distributed around the top of the base, a positioning groove is provided on the top of the base, the ceramic tube is placed in the positioning groove, the positioning portion surrounds and clamps the ceramic tube, a reserved hole and a pressure relief groove are provided at the bottom of the base, the reserved hole is located directly below the detection component, the pressure relief groove is connected with the reserved hole and passes through the end face of the base, the lifting mechanism is fixed on the base, the positioning portion realizes stable fixation and positioning of the ceramic tube, and the pressure relief groove and the reserved hole are used to export pressurized air.

[0031] The beneficial effects of the present invention are as follows:

[0032] 1. The present invention utilizes the detection component to move inside the ceramic tube, cooperates with the annular pressure detection cavity and the sealing component, to realize the formation of a surrounding detection area inside the ceramic tube, and utilizes the filling of pressurized air to perform pressurized detection on the inner wall to be tested, cooperates with the pressure valve and the rotating detection part, and realizes synchronous detection of obvious cracks, hidden cracks (cracks are squeezed and enlarged after pressure is applied) and thin-walled cavities inside the ceramic. On the one hand, it greatly improves the detectable range, and on the other hand, it exposes the hidden defects in advance by amplifying the defects, so that accurate and comprehensive internal defect detection can be completed without using high-end equipment.

[0033] 2. The present invention uses an angular velocity sensor to detect rotational speed changes and dynamically completes ceramic defect detection. For gaps and observed voids, the defect size can be intuitively judged by numerical values. For extremely small gaps and holes, since pressure can be established and a small amount of leakage exists, the actual bypass air pressure is insufficient and the rotation speed is reduced, thereby completing the judgment. For the situation where air pressure cannot be established at all, the auxiliary rod is used to directly observe that there is no rotation, and the defect can be intuitively judged to be large.

[0034] 3. The present invention utilizes inclined and circumferentially distributed purge holes. During a defect-free detection process, the pressure gas that reaches the pressure value bypasses and is guided to purge the inner wall of the ceramic. The bypass pressure airflow promotes the rotation of the rotating detection part to realize the rotation of the cleaning part. In combination with the airflow purge, the cleaning brush can further realize the rotational friction cleaning of the ceramic inner wall to remove the stuck debris and particles, remove the attachments while completing the cleaning, avoid the influence of the attachments on the subsequent visual inspection, and avoid the clogging of the gap holes by fine particles, thereby ensuring the accuracy of subsequent inspections and realizing synchronous cleaning processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural schematic diagram of the present invention;

[0036] Figure 2 It is a schematic diagram of the top surface of the base of the present invention;

[0037] Figure 3 is a schematic diagram of the bottom surface of the base of the present invention;

[0038] Figure 4 It is a schematic diagram of the connection between the detection component and the connecting arm of the present invention;

[0039] Figure 5 It is a cross-sectional schematic diagram of the detection assembly and the rotary detection part of the present invention;

[0040] Figure 6 It is a schematic diagram of the installation of the detection component and the sealing component of the present invention;

[0041] Figure 7 is a cross-sectional schematic diagram of a fixed detection portion of the present invention;

[0042] Figure 8 is a schematic diagram of a sealing assembly of the present invention;

[0043] Fig. 9 is a cross-sectional schematic diagram of the detection assembly of the present invention;

[0044] Fig.10 Schematic diagram of the rotary detection unit of the present invention.

[0045] In the figure: 1. base; 2. positioning part; 3. lifting mechanism; 4. connecting arm; 5. detection component; 51. movable seat; 52. pressure detection chamber; 53. internal chamber; 54. pressure pump; 55. reversing valve; 56. pressure valve; 57. purge hole; 6. sealing component; 61. elastic sealing ring; 62. distribution pipe; 7. mounting sleeve; 8. fixed detection part; 81. support tube; 82. visual detector; 9. rotating detection part; 91. rotating shaft; 92. blade; 93. angular velocity sensor; 10. cleaning part; 101. support ring; 102. cleaning brush; 11. auxiliary rod; 12. reserved hole; 13. pressure relief groove. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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 creative work are within the scope of protection of the present invention.

[0047] like Figures 1 to 10As shown, an embodiment of the present invention provides a ceramic internal defect detection device, including a base 1, a positioning part 2 and a lifting mechanism 3, the lifting mechanism 3 is a hydraulic telescopic structure, the positioning part 2 is distributed around the top of the base 1, a ceramic tube to be tested is provided on the top of the base 1, a positioning groove is provided on the top of the base 1, the ceramic tube is placed in the positioning groove, the positioning part 2 is a sliding clamp, the positioning part 2 surrounds and clamps the ceramic tube, the positioning part 2 realizes stable fixation and positioning of the ceramic tube, and the lifting mechanism 3 is fixed on the base 1.

[0048] A detection assembly 5 is provided above the base 1, and a connecting arm 4 fixedly connected to the movable end of the lifting mechanism 3 is fixedly provided on the top of the detection assembly 5. The detection assembly 5 gradually detects from top to bottom along the inside of the ceramic tube. The detection assembly 5 includes a movable seat 51, a pressure detection chamber 52, an internal chamber 53, a pressure pump 54, a reversing valve 55 and a pressure valve 56; the movable seat 51 is in the shape of an "I" character and moves downward along the inside of the ceramic tube, the pressure detection chamber 52 is located in the middle of the outer side of the movable seat 51, and the pressure detection chamber 52 is opened inside the movable seat 51; the pressure pump 54 is fixed on the top of the movable seat 51, the air outlet end of the pressure pump 54 passes through the top surface of the movable seat 51 and extends into the pressure detection chamber 52 and is fixedly installed with the reversing valve 55, the pressure valve 56 is installed in the pressure detection chamber 52 and controls the communication between the pressure detection chamber 52 and the internal chamber 53, and a mounting sleeve 7 is fixedly provided on the top of the movable seat 51, and the mounting sleeve 7 covers the top of the pressure pump 54 to realize the protection and auxiliary fixation of the pressure pump 54.

[0049] Sealing components 6 are provided at the upper and lower parts of the outer surface of the detection component 5. The sealing components 6 are in contact with the inner wall of the ceramic tube and slide relatively. The sealing components 6 include: an elastic sealing ring 61 and a distribution pipe 62. There are two elastic sealing rings 61 and they are distributed up and down on the outer surface of the movable seat 51. The elastic sealing ring 61 is fixedly sleeved through the annular groove provided on the outer surface of the movable seat 51. The elastic sealing ring 61 is symmetrically distributed on both sides of the pressure detection cavity 52; the distribution pipe 62 is fixedly sleeved between the two elastic sealing rings 61, and the distribution pipe 62 is fixedly connected to one end of the reversing valve 55. When the air pressure inside the elastic sealing ring 61 reaches the set value, the reversing valve 55 closes the passage leading to the elastic sealing ring 61, and opens the passage leading to the pressure detection cavity 52 in linkage. When the air pressure inside the pressure detection cavity 52 reaches the set value, the pressure valve 56 controlling the pressure detection cavity 52 to the internal cavity 53 is opened.

[0050] When the elastic sealing ring 61 is filled with pressurized air, it gradually deforms and expands, and contacts and squeezes the ceramic tube wall in the ceramic tube wall to complete the relative sealing process. Moreover, since the ceramic tube wall is clamped and fixed externally, when the lifting mechanism 3 drives the detection component 5 to move downward, it also drives the elastic sealing ring 61 to move downward to achieve dynamic sealing.

[0051] A rotating detection part 9 is rotatably provided inside the detection component 5 , and a fixed detection part 8 sleeved on the outside of the rotating detection part 9 is fixedly provided on the top of the detection component 5 , wherein the fixed detection part 8 includes a support tube 81 and a visual detector 82 .

[0052] The support tube 81 is fixedly sleeved on the top of the movable seat 51, a detachable positioning ring is provided on the top of the support tube 81, and a reserved cavity is provided inside the top of the support tube 81; the visual detector 82 is distributed on the outer surface of the support tube 81 in a surrounding manner, and the inner wall of the ceramic tube is detected by using the surrounding visual detector 82. The surrounding visual detector 82 is specifically a picture shooting device, and the respective observation angles are greater than 120° under the equally spaced surrounding, thereby ensuring a comprehensive detection of the inside of the ceramic.

[0053] The fixed inspection unit 8 cooperates with the visual detector 82 carried by it to perform complete visual inspection during the downward movement, obtain the image of the inner wall of the ceramic, and comprehensively complete the defect detection.

[0054] The rotation detection part 9 includes: a rotating shaft 91, a blade 92 and an angular velocity sensor 93. The rotating shaft 91 is rotatably installed in the support tube 81 through a bearing. A sealing ring is also provided between the rotating shaft 91 and the support tube 81. The lower end of the rotating shaft 91 passes through the movable seat 51 and should extend to the bottom of the movable seat 51. The blade 92 is fixedly sleeved on the rotating shaft 91. The angular velocity sensor 93 is fixed on the top of the rotating shaft 91 and is located in a reserved cavity at the top of the support tube 81. The angular velocity sensor 93 detects the speed of the rotating shaft 91 and reflects the bypass air pressure acting on the blade 92 in the internal cavity 53. An auxiliary rod 11 is provided on the top of the angular velocity sensor 93. The auxiliary rod 11 passes through the support tube 81 and extends upward for a distance.

[0055] The reserved cavity is used to reserve the placement of the angular velocity sensor 93 and provide installation space, and the positioning ring on the top of the support tube 81 facilitates the positioning of the auxiliary rod 11 and maintains the rotation support of the auxiliary rod 11. The positioning ring facilitates the removal of the angular velocity sensor 93 for inspection and replacement after disassembly. The length of the auxiliary rod 11 is preferably greater than the length of the ceramic tube, so that it is always possible to conveniently observe from the top whether the auxiliary rod 11 is rotating.

[0056] The blades 92 are subjected to the bypass high-pressure gas to achieve rotation, and the angular velocity sensor 93 is used to detect the rotation speed change, so as to dynamically complete the ceramic defect detection. For gaps and observed voids, the defect size can be intuitively judged by numerical values. For extremely small gaps and holes, since pressure can be established and there is a small amount of leakage, the actual bypass air pressure is insufficient and the rotation speed is reduced, thereby completing the judgment. For the situation where air pressure cannot be established at all, the auxiliary rod 11 is used to directly observe that there is no rotation, so that it can be intuitively judged that the defect is large.

[0057] The reversing valve 55 can realize the input of pressurized gas in different directions. On the one hand, it is used to realize high pressure detection, and on the other hand, it provides expansion power for the sealing component 6. When the inside of the elastic sealing ring 61 reaches the set value, the reversing valve 55 opens to input the gas into the pressure detection chamber 52 to perform internal pressure detection. The set pressures of the pressure valve 56 and the reversing valve 55 can be adjusted, and when the pressure in the pressure detection chamber 52 reaches the set value, the pressure valve 56 opens to further bypass the gas into the internal chamber 53, so that the pressurized gas is used to push the blade 92, that is, a high-pressure zone is formed inside the detection component 5, and when the set pressure is reached, the pressurized air is bypassed and the rotary detection part 9 is driven to rotate.

[0058] By using the detection component 5 to move inside the ceramic tube, cooperating with the annular pressure detection chamber 52 and the sealing component 6, a surrounding detection zone is formed inside the ceramic tube, and the inner wall to be tested is pressurized and tested by filling with pressurized air. In cooperation with the pressure valve 56 and the rotating detection part 9, the obvious cracks and hidden cracks in the ceramic (the cracks are squeezed and enlarged after pressure is applied, specifically for a ceramic tube with a certain toughness, when there is a defective fracture in the inner wall but it remains closed, the stress generated by the increase in local air pressure will be highly concentrated at the crack tip. This stress concentration leads to the expansion of the crack, especially for the crack tip is very sharp or Synchronous detection is achieved when there are other factors that promote crack expansion, such as impurities or defects in the material, and thin-walled cavities (specifically, cavity defects in the inner wall of the ceramic tube, especially when the gas retained inside during the preparation and molding forms tiny voids, which form thin-walled tiny voids close to the inner wall of the pipe). Local air pressure acts on the outside of the tiny void, causing a pressure difference inside and outside the void. Under a large pressure difference, the brittle thin wall of the void is broken, revealing the void defect. On the one hand, this greatly improves the detectable range, and on the other hand, it exposes hidden defects in advance by amplifying the defects. Accurate and comprehensive internal defect detection can be completed without the use of high-end equipment.

[0059] The detection component 5 also includes a purge hole 57, which is distributed around the bottom of the movable seat 51. The upper ends of the multiple groups of purge holes 57 are inclined close to and connected with the internal cavity 53. A cleaning part 10 is provided at the bottom of the rotating detection part 9. The cleaning part 10 includes: a support ring 101, which is fixedly connected to the lower end of the rotating shaft 91 through an inner connecting rod; a cleaning brush 102, which is a wire brush, and the cleaning brush 102 is fixedly arranged on the outer surface of the support ring 101 and distributed around.

[0060] By utilizing the inclined and circumferentially distributed purge holes 57, during a defect-free inspection process, the pressurized gas that has reached the pressure value bypass is utilized and guided to purge the inner wall of the ceramic, and the bypass pressure airflow is coordinated to promote the rotation of the rotating detection part 9 to realize the rotation of the cleaning part 10. In combination with the airflow purge, the cleaning brush 102 can further realize the rotational friction cleaning of the ceramic inner wall to remove the adhered debris and particles, and remove the attachments while completing the cleaning, thereby avoiding the influence of the attachments on the subsequent visual inspection, and preventing the clogging of the gap holes by fine particles, thereby ensuring the accuracy of subsequent inspections and realizing synchronous cleaning processing.

[0061] A reserved hole 12 and a pressure relief groove 13 are provided at the bottom of the base 1 . The reserved hole 12 is located directly below the detection assembly 5 . The pressure relief groove 13 is connected to the reserved hole 12 and passes through the end surface of the base 1 .

[0062] The pressure relief groove 13 and the reserved hole 12 are used to guide out the pressurized air.

[0063] The working principle and use process of the present invention:

[0064] When in use, place the ceramic tube in the positioning groove on the top surface of the base 1, start the positioning part 2 to clamp and fix the ceramic tube, start the lifting mechanism 3 and drive the connecting arm 4 to move downward, and make the detection component 5 be inserted from the top of the ceramic tube, and at the same time drive the sealing component 6 to be inserted, as the sealing component 6 is completely inserted, start the pressure pump 54 to output pressurized air, so that the reversing valve 55 is first connected to the distribution pipe 62 alone, and the pressurized gas is input into the elastic sealing ring 61, and the elastic sealing ring 61 elastically collides and contacts and presses the inner wall of the ceramic tube. After the sealing is completed, the reversing valve 55 switches and inputs the pressurized gas into the pressure detection chamber 52. As the internal air pressure of the pressure detection chamber 52 gradually increases, the pressurized air acts on the annular area of ​​the inner wall of the ceramic tube. When a large crack appears on the inner wall of the ceramic tube to be tested, the pressurized gas is blown out along the crack, and when there is a crack, the internal pressure value of the pressure detection chamber 52 cannot continue to increase, and the pressure valve 56 does not reach the set pressure value and does not open. At this time, the rotating detection part 9 does not rotate, and the auxiliary rod 11 does not rotate. The static state of the auxiliary rod 11 is directly observed to determine whether there is currently detected. Large cracks; when there are no cracks, as the internal pressure of the pressure detection chamber 52 is slowly built up, the pressure valve 56 is opened, the bypass pressure air flow flows into the internal cavity 53 and drives the blade 92 to rotate, so that the rotating shaft 91 and the angular velocity sensor 93 rotate at the same time, the auxiliary rod 11 rotates, and the external display device displays the speed detection value of the angular velocity sensor 93. The rotating shaft 91 drives the bottom cleaning part 10 to rotate, and the cleaning part 10 selects to rub and clean the inner wall of the ceramic tube through the cleaning brush 102, and gradually cleans it as the detection component 5 moves downward; when the external display device shows that the angular velocity detection value gradually decreases, it is judged that there are deformation cracks on the inner wall of the ceramic, and the cracks gradually appear under the increase of pressure; when there are thin-walled cavity defects in the inner wall of the ceramic, as the internal pressure of the pressure detection chamber 52 is built up, a large pressure difference is generated inside and outside the thin-walled cavity, and the thin-walled cavity is broken, and when the detection component 5 moves downward and gradually performs subsequent local detection, the visual detector 82 that follows the downward movement collects the inner wall image of the broken part to complete the defect detection, and as it continues to move downward, the comprehensive detection of the internal defects of the ceramic is completed.

[0065] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A ceramic internal defect detection device, comprising a base (1), a positioning portion (2) and a lifting mechanism (3), characterized in that: A detection assembly (5) is provided above the base (1); a connecting arm (4) fixedly connected to the movable end of the lifting mechanism (3) is fixedly provided on the top of the detection assembly (5); and a ceramic tube to be tested is provided on the top of the base (1); The detection component (5) detects gradually from top to bottom along the inside of the ceramic tube. The upper and lower parts of the outer surface of the detection component (5) are provided with sealing components (6). The sealing components (6) are in contact with the inner wall of the ceramic tube and slide relatively. The detection component (5) is provided with a rotating detection part (9) inside. The top of the detection component (5) is fixedly provided with a fixed detection part (8) sleeved on the outside of the rotating detection part (9). A high-pressure zone is formed inside the detection component (5). When the set pressure is reached, the pressure air is bypassed and the rotating detection part (9) is driven to rotate. The detection assembly (5) comprises a movable seat (51), a pressure detection chamber (52), an internal chamber (53), a pressure pump (54), a reversing valve (55) and a pressure valve (56); The movable seat (51) is in the shape of an I and moves downward along the interior of the ceramic tube; the pressure detection cavity (52) is located in the middle of the outer side of the movable seat (51); the pressure detection cavity (52) is opened inside the movable seat (51); and a mounting sleeve (7) is fixedly provided on the top of the movable seat (51); The pressure pump (54) is fixed on the top of the movable seat (51); an air outlet end of the pressure pump (54) passes through the top surface of the movable seat (51) and extends into the pressure detection chamber (52) and is fixedly mounted with the reversing valve (55); the pressure valve (56) is mounted in the pressure detection chamber (52) and controls the communication between the pressure detection chamber (52) and the internal chamber (53); The sealing assembly (6) comprises: Elastic sealing rings (61), the number of the elastic sealing rings (61) being two and being distributed up and down on the outer surface of the movable seat (51), the elastic sealing rings (61) being fixedly sleeved through an annular groove provided on the outer surface of the movable seat (51), and the elastic sealing rings (61) being symmetrically distributed on both sides of the pressure detection chamber (52); a distribution pipe (62), the distribution pipe (62) being fixedly sleeved between the two elastic sealing rings (61), the distribution pipe (62) being fixedly connected to one end of the reversing valve (55), and when the air pressure inside the elastic sealing ring (61) reaches a set value, the reversing valve (55) closes the passage leading to the elastic sealing ring (61) and opens the passage leading to the pressure detection chamber (52) in a linked manner, and when the air pressure inside the pressure detection chamber (52) reaches a set value, the pressure valve (56) leading from the pressure detection chamber (52) to the internal chamber (53) is controlled to open; a distribution pipe (62), the distribution pipe (62) being fixedly sleeved between the two elastic sealing rings (61), the distribution pipe (62) being fixedly connected to one end of the reversing valve (55); The rotary detection unit (9) comprises: A rotating shaft (91), the rotating shaft (91) being rotatably mounted in the support tube (81) via a bearing, a sealing ring being provided between the rotating shaft (91) and the support tube (81), and the lower end of the rotating shaft (91) passing through the movable seat (51) and extending to the bottom of the movable seat (51); a blade (92), wherein the blade (92) is fixedly sleeved on the rotating shaft (91), and the blade (92) is located in the internal cavity (53) and below the pressure valve (56); An angular velocity sensor (93) is fixed at the top of the rotating shaft (91) and is located in a reserved cavity at the top of the support tube (81). The angular velocity sensor (93) detects the velocity of the rotating shaft (91) and reflects the bypass air pressure acting on the blade (92) in the internal cavity (53). An auxiliary rod (11) is provided at the top of the angular velocity sensor (93). The auxiliary rod (11) passes through the support tube (81) and extends upward for a distance.

2. A ceramic internal defect detection device according to claim 1, characterized in that: The detection assembly (5) further comprises purge holes (57), which are distributed around the bottom of the movable seat (51), and the upper ends of the plurality of groups of purge holes (57) are inclined close to each other and communicate with the internal cavity (53).

3. A ceramic internal defect detection device according to claim 1, characterized in that: The fixed detection unit (8) comprises: A support tube (81), the support tube (81) being fixedly sleeved on the top of the movable seat (51), a detachable positioning ring being provided on the top of the support tube (81), and a reserved cavity being provided inside the top of the support tube (81); A visual detector (82) is distributed around the outer surface of the support tube (81), and the inner wall of the ceramic tube is detected by using the visual detector (82) distributed around the support tube (81).

4. A ceramic internal defect detection device according to claim 1, characterized in that: A cleaning portion (10) is provided at the bottom of the rotating detection portion (9), and the cleaning portion (10) comprises: A support ring (101), wherein the support ring (101) is fixedly connected to the lower end of the rotating shaft (91) via an inner connecting rod; A cleaning brush (102), wherein the cleaning brush (102) is a wire brush, and the cleaning brush (102) is fixedly arranged on the outer surface of the support ring (101) and distributed around the support ring (101).

5. A ceramic internal defect detection device according to claim 1, characterized in that: The positioning portion (2) is distributed around the top of the base (1); a positioning groove is provided on the top of the base (1); the ceramic tube is placed in the positioning groove; the positioning portion (2) surrounds and clamps the ceramic tube; a reserved hole (12) and a pressure relief groove (13) are provided at the bottom of the base (1); the reserved hole (12) is located directly below the detection component (5); the pressure relief groove (13) is connected to the reserved hole (12) and passes through the end surface of the base (1); and the lifting mechanism (3) is fixed on the base (1).

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