A pressure vessel inspection gauge

Abstract

This utility model relates to the field of weld inspection technology, and provides a pressure vessel inspection gauge, which includes a ruler plate and a height gauge. The height gauge is movably mounted on the ruler plate, and its ends extend beyond the edge of the ruler plate. Each end of the height gauge has a first limiting part. A protective sleeve is fitted onto the end of the height gauge, and the protective sleeve has a second limiting part that cooperates with the first limiting part for limiting. By providing a first limiting part at the end of the height gauge and a second limiting part within the protective sleeve that cooperates with the first limiting part for limiting, the protective sleeve is stably fixed at the end of the height gauge through a snap-fit ​​engagement. This technical solution solves the technical problem in related technologies where the tip of the inspection gauge lacks an effective protective device during transport.

Description

Technical Field

[0001] The embodiments of this utility model relate to the field of weld inspection technology, specifically to a pressure vessel inspection ruler. Background Technology

[0002] After the pressure vessel is manufactured, it needs to be inspected using a weld inspection gauge. Existing pressure vessel inspection gauges, to prevent workers from being scratched by the sharp ends during transport, have protective sleeves on both ends. However, the sleeves are not very secure and easily fall off during transport, reducing their protective effect. Furthermore, the gauge is prone to rotation during transport, and since the part of the gauge in contact with the workpiece surface is a sharp point, it is easily damaged during rotation, thus reducing the overall lifespan of the inspection gauge. Utility Model Content

[0003] To overcome the above-mentioned defects, embodiments of this utility model provide a pressure vessel inspection gauge, which solves the technical problem that the tip of the inspection gauge lacks an effective protective device during carrying in related technologies.

[0004] According to one aspect, at least one embodiment of the present invention provides a pressure vessel inspection gauge, comprising:

[0005] Ruler;

[0006] A height gauge is movably mounted on the ruler plate, and the ends of the height gauge can extend beyond the edge of the ruler plate. The ends of the height gauge are provided with a first limiting part.

[0007] A protective sleeve is provided for being fitted onto the end of the height gauge, and the protective sleeve is provided with a second limiting part for cooperating with the first limiting part for limiting.

[0008] For example, a pressure vessel inspection gauge provided in at least one embodiment of this utility model further includes:

[0009] A depth gauge is movably disposed on the ruler plate and spaced apart from the height gauge, the depth gauge having a detection head extending to the outside of the ruler plate;

[0010] A protective sleeve that can be fitted onto the detection head of the depth gauge.

[0011] For example, in a pressure vessel inspection gauge provided in at least one embodiment of the present invention, the protective sleeve has a receiving cavity for accommodating the end of the height gauge;

[0012] The protective sleeve also includes a locking component movably connected to the receiving cavity. The second limiting portion is disposed on the locking component. The locking component has a locked position and an unlocked position. The locking component is configured such that when it is in the locked position, the second limiting portion engages with the first limiting portion, and when it is in the unlocked position, the second limiting portion disengages from the first limiting portion.

[0013] For example, in a pressure vessel inspection gauge provided in at least one embodiment of the present invention, the locking assembly includes a movable frame and an elastic element disposed around the receiving cavity, and the side wall of the receiving cavity has two through guide holes;

[0014] The movable frame includes a lifting plate, two guide rods, and a push plate. The lifting plate is located inside the receiving cavity, the second limiting part is disposed on the lifting plate, and the push plate is located outside the receiving cavity. The two guide rods are respectively disposed in two guide holes and connect the two ends of the lifting plate and the push plate respectively. The elastic element is located between the outer wall of the receiving cavity and the push plate. The elastic element can push the push plate to move away from the outer wall of the receiving cavity to the locking position.

[0015] For example, in a pressure vessel inspection gauge provided in at least one embodiment of the present invention, the locking component further includes a limiting block, which can be inserted between the push plate and the outer wall of the receiving cavity to fix the locking component in the locking position.

[0016] For example, in a pressure vessel inspection gauge provided in at least one embodiment of the present invention, the limiting block is threadedly connected to a fastener, which can fix the limiting block to the protective sleeve.

[0017] For example, in a pressure vessel inspection gauge provided in at least one embodiment of the present invention, the two ends of the receiving cavity have a first opening and a second opening respectively. The first opening is used for the end of the height gauge to enter the receiving cavity. The side wall of the second opening is provided with a relief groove. The lifting plate can enter the receiving cavity through the second opening. The guide hole is located in the relief groove. The guide rod can enter the guide hole through the relief groove.

[0018] For example, in a pressure vessel inspection gauge provided in at least one embodiment of the present invention, a sealing plate is provided at the second opening, and a support plate for blocking the relief groove is provided on the end face of the sealing plate near the relief groove.

[0019] For example, in a pressure vessel inspection ruler provided in at least one embodiment of the present invention, a multi-purpose ruler is rotatably disposed on the ruler plate. The multi-purpose ruler is located on the end face of the ruler plate opposite to the height ruler. The ruler plate is also provided with a protective plate, and the protective plate has a receiving groove for accommodating the tip of the multi-purpose ruler.

[0020] For example, in a pressure vessel inspection ruler provided in at least one embodiment of the present invention, a positioning plate is rotatably provided on the protective plate, and a clamping space is formed between the positioning plate and the side wall of the protective sleeve. The positioning plate can be rotated to clamp the multi-purpose ruler.

[0021] The beneficial effects of the embodiments of this utility model are as follows:

[0022] In this invention, a first limiting part is provided at the end of the height gauge, and a second limiting part is provided inside the protective sleeve. The limiting cooperation between the second and first limiting parts ensures the stable fixation of the protective sleeve at the end of the height gauge. This structural design is simple, easy to operate, and effectively prevents the protective sleeve from falling off during transport, thus improving the protective effect. Simultaneously, because the protective sleeve is stably fixed to the end of the height gauge, relative sliding between the protective sleeve and the height gauge is avoided, thereby reducing wear on both and extending the service life of the inspection gauge. Furthermore, this structural design does not rely on additional tools or complex operations, allowing users to quickly and easily install and remove the protective sleeve, improving work efficiency. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this utility model and these drawings without any creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of the inspection ruler without the protective sleeve in one embodiment of the present invention;

[0025] Figure 2 for Figure 1 A schematic diagram of the structure of the protective device for installing the inspection ruler in the embodiment;

[0026] Figure 3 This is a schematic diagram of the protective sleeve structure of this utility model;

[0027] Figure 4 This utility model Figure 3 Sectional view along line AA;

[0028] Figure 5 for Figure 2 An enlarged structural diagram at point A in the diagram;

[0029] Figure 6 This is a schematic diagram of the structure of the protective sleeve and protective cover of this utility model;

[0030] Figure 7 This is a schematic diagram of the structure of the protective sleeve of this utility model;

[0031] Figure 8 This is a schematic diagram of the structure of the sealing plate of this utility model;

[0032] Figure 9 This is a schematic diagram of the structure of the present invention equipped with a multi-purpose ruler;

[0033] Figure 10 Another structural diagram of the protective device installed on the inspection ruler of this utility model;

[0034] Figure 11 This is a partial structural diagram of the protective device installed on the inspection ruler of this utility model.

[0035] In the diagram: 100, ruler plate; 110, height gauge; 111, first limiting part; 120, depth gauge; 130, multi-purpose ruler; 200, protective sleeve; 201, receiving cavity; 202, first opening; 203, second opening; 204, clearance groove; 210, second limiting part; 220, lifting plate; 230, guide rod; 240, push plate; 250, elastic element; 260, limiting block; 270, fastener; 280, sealing plate; 281, support plate; 300, protective sleeve; 400, protective plate; 410, receiving groove; 420, positioning plate. Detailed Implementation

[0036] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit its scope.

[0037] To keep the drawings concise, only the parts relevant to the utility model are shown schematically in each drawing; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of the components with the same structure or function is schematically shown, or only one is labeled. In this document, "a" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0038] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0039] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0040] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0041] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0042] like Figures 1-5 As shown, it illustrates a pressure vessel inspection gauge according to one embodiment of the present invention, wherein... Figure 1The structure of the inspection ruler without protective devices consists of a ruler plate 100, a height gauge 110, and a depth gauge 120. The ruler plate 100 is a plate-like structure, with the height gauge 110 and depth gauge 120 spaced apart on it, both of which can slide along the ruler plate 100. The ends of the height gauges 110 extend beyond the edge of the ruler plate 100 and each end is provided with a first limiting part 111. The protective sleeve 200 has a receiving cavity 201 inside, which is used to receive the ends of the height gauges 110. A second limiting part 210 is provided within the receiving cavity 201, and the shape of the second limiting part 210 is adapted to the first limiting part 111, allowing it to cooperate with the first limiting part 111 for limiting. When the height gauge 110 is needed, the protective sleeve 200 is slid out from the end of the height gauge 110, so that the second limiting part 210 is disengaged from the first limiting part 111; when the inspection ruler is needed, the protective sleeve 200 is put on the end of the height gauge 110, so that the second limiting part 210 and the first limiting part 111 are engaged in a limiting cooperation, thereby fixing the protective sleeve 200 to the end of the height gauge 110 and preventing the protective sleeve 200 from falling off.

[0043] By providing a first limiting part 111 at the end of the height gauge 110 and a second limiting part 210 inside the protective sleeve 200, the protective sleeve 200 is stably fixed at the end of the height gauge 110 through the snap-fit ​​engagement between the second limiting part 210 and the first limiting part 111. This structural design is simple and easy to operate, effectively preventing the protective sleeve 200 from falling off during transport and improving the protective effect. Simultaneously, because the protective sleeve 200 is stably fixed at the end of the height gauge 110, relative sliding between the protective sleeve 200 and the height gauge 110 is avoided, thereby reducing wear on both and extending the service life of the inspection gauge. Furthermore, this structural design does not rely on additional tools or complex operations, allowing users to quickly and easily install and remove the protective sleeve 200, improving work efficiency.

[0044] The receiving cavity 201 is provided with a locking component, and the second limiting part 210 is provided on the locking component. The locking component has two states: a locked position and an unlocked position. When the locking component is in the locked position, the first limiting part 111 and the second limiting part 210 are engaged, and the protective sleeve 200 cannot be detached from the end of the height gauge 110, which can improve the reliability of locking and reduce the risk of the protective sleeve 200 accidentally falling off. When the locking component is in the unlocked state, the first limiting part 111 and the second limiting part 210 are disengaged, and the protective sleeve 200 can be detached from the end of the height gauge 110, which facilitates the use of the height gauge 110.

[0045] In some embodiments, such as Figure 4As shown, the locking assembly includes a movable frame and an elastic element 250. The movable frame consists of a lifting plate 220, two guide rods 230, and a push plate 240. The lifting plate 220 is located inside the receiving cavity 201 and can move within the receiving cavity 201. The second limiting part 210 is fixed to the surface of the lifting plate 220 facing the end of the height gauge 110. The push plate 240 is located outside the receiving cavity 201. The two guide rods 230 are respectively disposed in two guide holes and are connected to the two ends of the lifting plate 220 and the push plate 240 respectively. An elastic element 250, such as a spring, is provided between the push plate 240 and the outer wall of the protective sleeve 200. The elastic element 250 can push the push plate 240 to move away from the outer wall of the receiving cavity 201. At this time, the first limiting part 111 and the second limiting part 210 can engage, and this position is the locking position of the locking assembly. Pushing the push plate 240 towards the side closer to the protective sleeve 200 compresses the elastic element 250, causing the second limiting part 210 to move in the opposite direction and disengage from the first limiting part 111. This position is the unlocking position of the locking component. In this embodiment, the locking component uses a "U"-shaped moving frame. The "U"-shaped moving frame restricts the movement direction of the moving frame through two guide rods 230, making the movement process of the moving frame more stable. In other embodiments, the locking component may also use other structures, such as an "I"-shaped moving frame, which is not limited here.

[0046] The first limiting part 111 can be a limiting groove formed at the end of the height gauge 110, and the second limiting part 210 can be a locking block that cooperates with the limiting groove. The first limiting part 111 can also be a locking block without affecting normal use, and the corresponding second limiting part 210 can be a limiting groove. The first limiting part 111 and the second limiting part 210 can also adopt other structures, such as a spring and a locking groove, and the user can move the spring to release its lock with the locking groove, which is not limited here. When the end of the height gauge 110 has not entered the protective sleeve 200, under the action of the elastic member 250, the second limiting part 210 presses against the inner wall of the receiving cavity 201 on the same side as the push plate 240 and abuts against the inner wall. At this time, the elastic member 250 can be in a compressed state or a natural state, that is, its elastic force can push the push plate 240 away from the protective sleeve 200. When the end of the height gauge 110 is about to enter the receiving cavity 201, the push plate 240 is first pushed towards the protective sleeve 200. At this time, the elastic element 250 is compressed, and the clamping space formed between the lifting plate 220 and the inner wall of the receiving cavity 201 expands. Then, the protective sleeve 200 is put onto the end of the height gauge 110, and the push plate 240 is released. Under the action of the elastic reset element 250, the push plate 240 drives the lifting plate 220 to move through the guide rod 230, thereby causing the second limiting part 210 to engage with the first limiting part 111, so as to prevent the protective sleeve 200 from detaching from the end of the height gauge 110 when carrying the inspection gauge. During the process of the lifting plate 220 moving towards the end of the height gauge 110, a clamping space is formed between the end face of the lifting plate 220 and the inner wall of the receiving cavity 201, which compresses the material at the end of the height gauge 110, forming frictional resistance. As the second limiting part 210 engages with the first limiting part 111, one inner wall of the receiving cavity 201, under the action of the lifting plate 220, tightly fits against the end of the height gauge 110, achieving double fixation of the protective sleeve 200 and increasing the reliability of protection. Double fixation is achieved through the movable lifting plate 220: the engagement of the second limiting part 210 with the first limiting part 111 provides a limit along the length of the height gauge 110, preventing the protective sleeve 200 from falling off; the clamping of the clamping space provides constraint, suppressing the shaking of the protective sleeve 200. The combined effect of these two mechanisms improves the stability of the protective sleeve 200 in complex environments, making it particularly suitable for scenarios where the inspection gauge is frequently carried or subjected to collisions.

[0047] Furthermore, a limiting block 260 is slidably provided on the outer wall of the protective sleeve 200 on the same side as the push plate 240. A sliding groove is opened on the outer wall of the protective sleeve 200, and a matching slider is provided at the bottom of the limiting block 260, forming a sliding pair. The limiting block 260 can slide into the gap between the push plate 240 and the closed end of the protective sleeve 200. A threaded hole is opened on the top surface of the limiting block 260. A fastener 270 (such as a bolt) is screwed into the threaded hole and can press against the outer wall of the protective sleeve 200, locking the position of the limiting block 260 by friction. After the second limiting part 210 enters the first limiting part 111, the limiting block 260 can be slid between the push plate 240 and the outer wall of the protective sleeve 200, and the position of the limiting block 260 is locked by the fastener 270. The movement of the push plate 240 is restricted by the limiting block 260, so that when the protective sleeve 200 is fitted on the end of the height ruler 110, the second limiting part 210 cannot come out from the first limiting part 111, further ensuring that the protective sleeve 200 will not come out from the end of the height ruler 110.

[0048] The preload of the elastic element 250 ensures that the second limiting part 210 continuously acts on the first limiting part 111. Combined with the action of the limiting block 260 and the fastener 270, this prevents the second limiting part 210 from accidentally disengaging, even under vibration. The engagement of the guide rod 230 with the guide hole restricts the movement trajectory of the lifting plate 220, preventing misalignment between the second limiting part 210 and the first limiting part 111, thus improving structural reliability. Simultaneously, after removing the limiting block 260, the user can quickly release the latch by pressing the push plate 240, enabling convenient disassembly of the protective sleeve 200.

[0049] When the protective sleeve 200 needs to be removed, the sliding limit block 260 moves it out of the push plate 240 and locks it. Pushing the push plate 240 towards the protective sleeve 200 keeps the second limit part 210 disengaged from the first limit part 111, facilitating quick removal of the protective sleeve 200. This structure avoids frequent pressing of the push plate 240 during inspection operations, improving work efficiency. Simultaneously, the locking function of the fastener 270 prevents the limit block 260 from accidentally sliding, ensuring ease of operation.

[0050] Reference Figures 6-8The protective sleeve 200 has a first opening 202 and a second opening 203 at both ends of its receiving cavity 201. The first opening 202 is used to insert the end of the height gauge 110. The width of the second opening 203 is greater than the length of the lifting plate 220, and the width of the clearance groove 204 on its side wall is the same as the width of the guide rod 230. During assembly, the lifting plate 220 slides into the receiving cavity 201 through the second opening 203, and the guide rod 230 passes through the clearance groove 204; the sealing plate 280 is fixed to the second opening 203 by snap-fit ​​or threaded connection, and the support plate 281 on its edge is inserted into the clearance groove 204, forming a guide hole for the guide rod 230 to pass through through the support plate 281 and the inner wall of the clearance groove 204. The split assembly structure simplifies the installation process of the internal components of the protective sleeve 200 and reduces the manufacturing difficulty. The combined design of the sealing plate 280 and the support plate 281 ensures the sliding freedom of the lifting plate 220 while preventing the guide rod 230 from dislodging from the relief groove 204, thus improving structural stability. The relief groove 204 also provides guiding space for the movement of the guide rod 230, optimizing the internal layout.

[0051] Reference Figure 2 , Figure 6 One side of the protective sleeve 200 extends to form a protective sleeve 300 that matches the shape of the end of the depth gauge 120; the two are integrally structured. The protective sleeve 300 is hollow, with its open end having an inner diameter slightly smaller than the outer diameter of the end of the depth gauge 120, creating an interference fit. After the end of the depth gauge 120 is inserted into the protective sleeve 300, the friction between its outer wall and the inner wall of the protective sleeve 300 prevents the protective sleeve 300 from falling off. By integrating the protective sleeve 300 onto the protective sleeve 200, simultaneous protection of the ends of the height gauge 110 and the depth gauge 120 is achieved, reducing the number of parts and lowering the risk of loss. The integrally molded structure improves the overall integrity of the protective assembly, avoids interference between multiple independent protective sleeves 200, and simplifies the operation steps during carrying.

[0052] Reference Figures 9-11 The multi-tool 130 on the ruler plate 100 is rotatably connected to the ruler plate 100 via a pivot, and its tip can also extend out of the edge of the ruler plate 100. A protective sleeve 200 is fixedly connected to a protective plate 400 at the position corresponding to the tip of the multi-tool 130. The receiving groove 410 of the protective plate 400 is a through groove, and its opening width is slightly larger than the thickness of the multi-tool 130. By rotating the multi-tool 130, its tip can be fed into the receiving groove 410. Simultaneously, a positioning plate 420 is hinged to the protective plate 400 via a pin, and can rotate around the pin to a position parallel to the outer wall of the protective sleeve 200. A torsion spring is installed on the pivot of the positioning plate 420. In its natural state, the positioning plate 420 can approach the protective sleeve 200 under the action of the torsion spring, at which point a space for accommodating the multi-tool 130 is formed between the positioning plate 420 and the outer wall of the protective sleeve 200.

[0053] When the measuring ruler is in the carrying state, rotate the positioning plate 420 to move it away from the protective sleeve 200, rotate the multi-purpose ruler 130 so that its tip is engaged in the receiving groove 410, and release the positioning plate 420. The positioning plate 420, together with the anti-slip and heat-insulating side wall, can clamp the multi-purpose ruler 130, restricting its rotational freedom. This structure prevents accidental rotation of the multi-purpose ruler 130 during carrying, protects the tip from impact damage, and extends the service life of the multi-purpose ruler 130. At the same time, the integrated design of the protective plate 400 and the protective sleeve 200 avoids the installation of additional parts and maintains the overall compactness of the measuring ruler. The rotation axis of the positioning plate 420 is not within the rotation range of the multi-purpose ruler 130, avoiding interference with the rotation of the multi-purpose ruler 130 when fixing it.

[0054] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A pressure vessel inspection gauge, characterized in that, include: Ruler (100); A height gauge (110) is movably disposed on the ruler plate (100). The ends of the height gauge (110) can extend out of the edge of the ruler plate (100). The ends of the height gauge (110) are provided with a first limiting part (111). A protective sleeve (200) is used to be fitted onto the end of the height gauge (110). The protective sleeve (200) is provided with a second limiting part (210) for cooperating with the first limiting part (111) for limiting.

2. The pressure vessel inspection gauge according to claim 1, characterized in that, Also includes: A depth gauge (120) is movably disposed on the ruler plate (100) and spaced apart from the height gauge (110). The depth gauge (120) has a detection head extending to the outside of the ruler plate (100). A protective sleeve (300) is provided, which can be fitted onto the detection head of the depth gauge (120).

3. The pressure vessel inspection gauge according to claim 1, characterized in that, The protective sleeve (200) has a receiving cavity (201) for receiving the end of the height gauge (110). The protective sleeve (200) further includes a locking component movably connected to the receiving cavity (201), the second limiting part (210) is disposed on the locking component, the locking component has a locked position and an unlocked position, the locking component is configured such that when it is in the locked position, the second limiting part (210) engages with the first limiting part (111), and when it is in the unlocked position, the second limiting part (210) disengages from the first limiting part (111).

4. The pressure vessel inspection gauge according to claim 3, characterized in that, The locking assembly includes a movable frame and an elastic element (250) arranged around the receiving cavity (201), the sidewall of which has two through guide holes; The movable frame includes a lifting plate (220), two guide rods (230), and a push plate (240). The lifting plate (220) is located inside the receiving cavity (201). The second limiting part (210) is disposed on the lifting plate (220). The push plate (240) is located outside the receiving cavity (201). The two guide rods (230) are respectively disposed in two guide holes and connect the two ends of the lifting plate (220) and the push plate (240) respectively. The elastic element (250) is located between the outer wall of the receiving cavity (201) and the push plate (240). The elastic element (250) can push the push plate (240) to move away from the outer wall of the receiving cavity (201) to the locking position.

5. The pressure vessel inspection gauge according to claim 4, characterized in that, The locking assembly further includes a limiting block (260) that can be inserted between the push plate (240) and the outer wall of the receiving cavity (201) to fix the locking assembly in the locking position.

6. The pressure vessel inspection gauge according to claim 5, characterized in that, The limiting block (260) is threadedly connected to a fastener (270), which can fix the limiting block (260) to the protective sleeve (200).

7. The pressure vessel inspection gauge according to claim 4, characterized in that, The receiving cavity (201) has a first opening (202) and a second opening (203) at both ends. The first opening (202) is used for the end of the height gauge (110) to enter the receiving cavity (201). The side wall of the second opening (203) is provided with a relief groove (204). The lifting plate (220) can enter the receiving cavity (201) through the second opening (203). The guide hole is located in the relief groove (204). The guide rod (230) can enter the guide hole through the relief groove (204).

8. The pressure vessel inspection gauge according to claim 7, characterized in that, A sealing plate (280) is provided at the second opening (203), and a support plate (281) is provided on the end face of the sealing plate (280) near the relief groove (204) to block the relief groove (204).

9. The pressure vessel inspection gauge according to claim 2, characterized in that, It also includes a multi-purpose ruler (130) rotatably disposed on the ruler plate (100), the multi-purpose ruler (130) being located on the end face of the ruler plate (100) opposite to the height ruler (110), the ruler plate (100) also being provided with a protective plate (400), the protective plate (400) having a receiving groove (410) for receiving the tip of the multi-purpose ruler (130).

10. The pressure vessel inspection gauge according to claim 9, characterized in that, A positioning plate (420) is rotatably provided on the protective plate (400), and a clamping space is formed between the positioning plate (420) and the side wall of the protective sleeve (200). The positioning plate (420) can be rotated to clamp the multi-purpose ruler (130).

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