Component inner cavity structure size measuring device

Abstract

The utility model relates to a component inner cavity structure size measuring device. One end of the fixed measuring claw is fixedly arranged on the rod body, and the other end is detachably provided with a first measuring head; one end of the movable measuring claw is slidably mounted on the rod body, and the other end of the movable measuring claw is detachably provided with a second measuring head; the digital display device is arranged on the rod body in a sliding manner, is connected with the movable measuring claw and synchronously slides with the movable measuring claw; the installation directions of the first measuring head and the second measuring head are opposite, the central axis of the first measuring head and the central axis of the second measuring head are parallel to the rod body, and the first measuring head and the second measuring head extend into an inner cavity of a component from an inlet of the component to implement detection during detection. According to the utility model, the overall structure is simple, different measuring heads can be conveniently selected for measurement according to different component structures, the operation is convenient and flexible, rapid, accurate and reliable measurement can be realized, and the universality is strong.

Description

Technical Field

[0001] The utility model belongs to the technical field of measuring equipment, and particularly relates to a device for measuring the structural dimensions of a component inner cavity. Background Art

[0002] Before connecting the two halves of the coupling, the distance between the two shaft end faces in the coupling cavity needs to be measured. Since the distance between the two shaft end faces to be measured is not visible outside the coupling, and the axial dimension between the coupling flange end faces before the two halves of the coupling are connected is much smaller than the axial dimension between the two shaft end faces to be measured in the coupling cavity, standard measuring tools and traditional measuring rulers cannot measure the distance between the two shaft end faces in the coupling cavity. Utility Model Content

[0003] The utility model mainly solves the technical problem of providing a component inner cavity structural dimension measuring device which has a simple structure, is easy to operate, and can quickly and accurately measure the spacing dimension between two end faces to be measured in the component inner cavity.

[0004] In order to solve the above technical problems, the basic concept of the technical solution adopted by the utility model is:

[0005] A device for measuring the dimensions of a component inner cavity structure, comprising:

[0006] Rod body;

[0007] A fixed measuring claw, one end of which is fixedly mounted on the rod body and the other end of which is detachably mounted with a first measuring head;

[0008] A movable measuring claw, one end of which can be slidably mounted on the rod body and the other end of which can be detachably mounted with a second measuring head;

[0009] A digital display device is slidably mounted on the rod body, connected to the movable measuring claw and slides synchronously;

[0010] The first probe and the second probe are installed in opposite directions and their central axes are parallel to the rod body. During detection, the first probe and the second probe extend from the entrance on the component into the inner cavity of the component to perform detection.

[0011] Furthermore, the total thickness of the fixed measuring jaw and the movable measuring jaw in the radial direction is smaller than the axial dimension of the entrance, and the first measuring head and the second measuring head are inserted from the entrance at an insertion position where their axial directions are perpendicular to the axis of the surface to be measured, and are rotated 90° to a detection position where their axial directions are parallel to the axis of the surface to be measured to perform dimension measurement.

[0012] Furthermore, the first measuring head and the second measuring head are connected to the fixed measuring jaw and the movable measuring jaw via threads.

[0013] Furthermore, the fixed measuring claw and the movable measuring claw are both installed vertically relative to the rod body, and the first measuring head and the second measuring head extend vertically outward and are installed at the bottom ends of the fixed measuring claw and the movable measuring claw respectively.

[0014] Furthermore, the digital display device includes a sliding seat slidably connected to the rod body, a digital display screen is installed on the sliding seat, the sliding seat and the rod body are fixed at any position by fasteners, and the movable measuring claw is connected to one end of the sliding seat facing the fixed measuring claw.

[0015] Furthermore, the sliding seat is provided with a penetrating mounting hole, the shape of the mounting hole matches the shape of the rod body, the rod body passes through the mounting hole, and the rod body and the mounting hole are slidably matched to enable the sliding seat to slide along the rod body.

[0016] Furthermore, the movable measuring claw is placed at the rear of the rod body, and the end face of the sliding seat located in front of the rod body and facing the fixed measuring claw is used as a calibration surface for reading from the scale line. The calibration surface is on the same vertical plane as the outer end face of the shortest second probe after installation or is directly on the same vertical plane as the mounting surface of the second probe on which the movable measuring claw is mounted.

[0017] Furthermore, a side surface of the fixed measuring jaw facing the movable measuring jaw is a zero reference plane, corresponding to a zero scale line on the rod body.

[0018] Furthermore, a handle is installed at one end of the rod body, the handle is a horizontally placed column, the top end of the fixed measuring claw is connected to the handle, and the end surface of the handle facing the digital display device is in the same plane as the zero reference plane.

[0019] Furthermore, the component is a coupling, and the inlet is the axial gap between two half-coupling flanges, and during detection, the inlet extends from the gap between the two flanges.

[0020] In summary, the device for measuring the internal cavity structure dimensions of a component provided by the utility model has the following advantages compared with the prior art:

[0021] (1) The overall structure of the measuring device is simple. The first probe and the second probe are installed by extending the fixed probe claw and the movable probe claw outward, and the movable probe claw is moved along the rod body, so that the first probe and the second probe are extended from the entrance of the component into the inner cavity of the component, and then they can be abutted against the two surfaces to be measured in the inner cavity of the component, so that the distance size between the two surfaces to be measured can be directly obtained, and the measurement process is fast, accurate and reliable.

[0022] (2) The first probe and the second probe in the measuring device are detachably mounted on the fixed probe claw and the movable probe claw, and are provided with several sets of probes of different lengths. Inspection personnel can select probes of different lengths to meet the measurement of the distance between the inner cavity surfaces to be measured of different structural components. The measuring device has strong versatility and is convenient and flexible to operate.

[0023] (3) The measuring device can be inserted from the entrance by adjusting the first probe and the second probe to the insertion position where the axial direction of the probe is perpendicular to the axis of the surface to be measured, and then rotated 90 degrees after entering the inner cavity of the component, and the first probe and the second probe are adjusted to the detection position where the axial direction of the probe is parallel to the axis of the surface to be measured, and then the dimension measurement is performed. The measuring device is particularly suitable for measuring components such as couplings whose axial dimension of the entrance is much smaller than the axial dimension between the two surfaces to be measured in the inner cavity.

[0024] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation on the present invention. Obviously, the accompanying drawings described below are only some embodiments. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0026] In the attached picture:

[0027] Figure 1 This is a schematic diagram of the structure of the coupling measuring device of the utility model in the use state;

[0028] Figure 2 It is a schematic diagram of the structure of the measuring device of the utility model;

[0029] Figure 3 yes Figure 2 lateral view of;

[0030] Figure 4 It is a structural stereogram of the measuring device of the utility model.

[0031] In the figure:

[0032] Half coupling 1, flange 2, shaft end face 3, inlet 4, bolt 5, rod body 6, fixed measuring jaw 7, side 71, movable measuring jaw 8, digital display device 9, sliding seat 91, digital display screen 92, fastener 93, calibration surface 94, first measuring head 10, second measuring head 11, handle 12, end face 121.

[0033] It should be noted that the drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. The following embodiments are used to illustrate the utility model but are not used to limit the scope of the utility model.

[0035] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] like Figure 1 As shown, the utility model provides a component inner cavity structure dimension measuring device, which can be used to detect the distance dimension between the two ends of the inner cavity of the component. In this embodiment, the distance dimension detection between the two shaft end faces of the inner cavity of the coupling is taken as an example for detailed description, and the measurement is performed before the two half couplings 1 are connected.

[0038] The two half-couplings 1 have flanges 2 at opposite ends, and the two flanges 2 are fixedly connected together by bolts 5, so that the connection between the two half-couplings 1 can be completed. What needs to be tested is the distance dimension X between the two shaft end faces 3 in the inner cavity of the two half-couplings 1. The two shaft end faces 3 are the test surfaces. There is a gap between the two flanges 2, and the gap is used as the inlet 4 of the measuring device. The axial distance between the two shaft end faces 3 is much larger than the axial dimension of the inlet 4.

[0039] like Figures 1 to 4 As shown, in this embodiment, the measuring device includes a rod body 6, a fixed measuring claw 7, a movable measuring claw 8, a digital display device 9, a first measuring head 10 and a second measuring head 11.

[0040] Among them, one end of the fixed measuring claw 7 is fixedly mounted on the rod body 6, and the fixed measuring claw 7 is fixed relative to the rod body 6, and the other end of the fixed measuring claw 7 can be detachably mounted on the first measuring head 10. One end of the movable measuring claw 8 can be slidably mounted on the rod body 6, and the other end can be detachably mounted on the second measuring head 11. The digital display device 9 can also be slidably mounted on the rod body 6 and connected to the movable measuring claw 8. The digital display device 9 and the movable measuring claw 8 can slide left and right along the rod body 6 synchronously.

[0041] The first probe 10 is installed by extending outward from the fixed measuring claw 7, and the second probe 11 is installed by extending outward from the movable measuring claw 8. The installation directions of the first probe 10 and the second probe 11 are opposite, facing the corresponding surfaces to be measured. The central axis of the first probe 10 and the second probe 11 is parallel to the rod body 6. During the inspection, the first probe 10 and the second probe 11 need to be extended from the entrance 4 to the inner cavity of the two half-couplings 1. The first probe 10, the second probe 11 and the rod body 6 are parallel to the axis of the two shaft end faces 3 to be measured. The movable measuring claw 8 and the digital display device 9 are moved left and right along the rod body 6. The first probe 10 and the second probe 11 are respectively against the two shaft end faces 3. At this time, the distance between the first probe 10 and the second probe 11 is the data to be measured. The measurement result is directly displayed on the digital display device 9, and the inspection personnel can directly obtain the size information from the digital display device 9. In this structure, the first probe 10 and the second probe 11 only need to be parallel to the rod body 6, and can be staggered with each other in either the horizontal plane or the vertical plane.

[0042] In the measuring device, the first probe 10 and the second probe 11 are respectively extended outward from the fixed measuring claw 7 and the movable measuring claw 8 to be installed, and the movable measuring claw 8 and the digital display device 9 are moved along the rod body 6, so that the first probe 10 and the second probe 11 are extended from the entrance 4 into the inner cavity of the component, and can be abutted against two surfaces to be measured in the inner cavity of the component (that is, the two shaft end surfaces 3 on the two half-couplings 1), and then the distance size between the two surfaces to be measured can be directly obtained from the digital display device 9, and the measuring process is fast, accurate and reliable.

[0043] In this embodiment, it is further preferred that the fixed measuring claw 7 and the movable measuring claw 8 are respectively vertically mounted on the rod body 6, and the first measuring head 10 and the second measuring head 11 are respectively vertically mounted at the bottom ends of the fixed measuring claw 7 and the movable measuring claw 8. In this way, the central axes of the first measuring head 10 and the second measuring head 11 are parallel to each other and to the rod body 6, and are also easy to control to be parallel to the central axes of the two shaft end faces 3 during detection. This structure makes it easy to control the measurement direction, making the measurement structure more accurate, and also makes the structure of the measurement device simpler and easier to operate.

[0044] In this embodiment, the first probe 10 and the second probe 11 are connected to the fixed measuring claw 7 and the movable measuring claw 8 by a detachable connection structure. More preferably, a threaded connection is adopted to facilitate disassembly and assembly. The first probe 10 and the second probe 11 are installed in a detachable manner, which is convenient for the inspection personnel to be equipped with several sets of probes of different lengths according to the different structures of the measured components. By selecting the first probe 10 and the second probe 11 of different lengths, the distance between the inner cavity surfaces to be measured of different structural components can be measured, which has strong versatility and is convenient and flexible to operate.

[0045] In this embodiment, the digital display device 9 includes a sliding seat 91 slidably connected to the rod body 6, and a penetrating mounting hole (not shown in the figure) is provided on the sliding seat 91. The rod body 6 passes through the mounting hole, and the shape of the mounting hole matches the shape of the rod body 6. The rod body 6 and the mounting hole are slidably matched to make the sliding seat 91 slide along the rod body 6. In this way, the movable measuring claw 8 and the digital display device 9 can slide smoothly, and the measurement accuracy can be guaranteed.

[0046] A digital display screen 92 is installed on the sliding seat 91, and the measured spacing between the two shaft end faces 3 of the inner cavity of the half coupling 1 is directly displayed on the digital display screen 92. The sliding seat 91 is fixed to the rod body 6 by a fastener 93, and the fastener 93 can preferably be a locking screw to fix the digital display device 9 at any position of the rod body 6. The digital display device 9 also has an on / off key and a reset key to facilitate the inspection personnel to perform corresponding operations as needed.

[0047] In this embodiment, the movable measuring claw 8 is connected to one end of the sliding seat 91 facing the fixed measuring claw 8, and the movable measuring claw 8 and the sliding seat 91 preferably adopt an integrated structure so that the movable measuring claw 8 and the sliding seat 91 slide along the rod body 6 together. Figure 2 As shown, the movable measuring claw 8 is indirectly connected to the rod body 6 through the sliding seat 91, that is, the movable measuring claw 8 is not directly connected to the rod body 6, but is connected to the sliding seat 91, and slides along the rod body 6 together with the sliding seat 91. The movable measuring claw 8 and the rod body 6 can also be directly connected through a sliding structure, such as a through-mounting hole is opened at the top of the movable measuring claw 8, and the rod body 6 passes through the mounting holes on the movable measuring claw 8 and the sliding seat 91 in turn, and the movable measuring claw 8 and the digital display device 9 slide along the rod body 6 synchronously.

[0048] In this embodiment, in addition to using the digital display device 9 to display the detection data, a size scale is also engraved on the rod body 6, and the value to be measured can also be intuitively seen through the scale.

[0049] In this embodiment, further, a side surface 71 of the fixed measuring claw 7 facing the movable measuring claw 8 is used as a zero reference plane, corresponding to the zero scale line on the rod body 6. Figure 2When the leftmost position is reached, the digital display 92 in the digital display device 9 displays "0", where "the leftmost position" refers to the limit position of the movable measuring claw 8 moving to the left. At this position, the side surface of the movable measuring claw 8 is in contact with the zero reference surface of the fixed measuring claw 7 or is in the same vertical plane. During detection, the outer end surface of the first measuring head 10 is in contact with the left end surface 3 of the shaft to be measured, which is the zero scale line of the end surface 3 of the shaft to be measured.

[0050] like Figure 3 As shown, the fixed measuring claw 7 extends vertically downward directly below the rod body 6. When the movable measuring claw 8 adopts a structure that is indirectly slidably connected to the rod body 6 through the sliding seat 91, the movable measuring claw 8 extends vertically downward behind the rod body 6. The fixed measuring claw 7 and the movable measuring claw 8 are staggered in the radial direction (the direction perpendicular to the axis of the shaft end face 3). In this embodiment, the fixed measuring claw 7 and the movable measuring claw 8 adopt a flat structure, and the total thickness D of the fixed measuring claw 7 and the movable measuring claw 8 in the radial direction is less than the axial dimension of the inlet 4 between the two flanges 2. In this way, the first probe 10 and the second probe 11 are inserted from the inlet 4 into the inner cavity of the coupling at the insertion position where the axial direction is perpendicular to the axis of the shaft end face 3 to be measured, and then the dimension measurement is carried out by rotating 90° to the detection position where the axial direction is parallel to the axis of the shaft end face 3 to be measured. In this way, when the axial dimension of the inlet 4 is less than the axial spacing between the two shaft end faces 3, or when the size of the inlet 4 is small, it can also be ensured that the measuring device can be smoothly inserted into the inner cavity of the coupling and other components for measurement, and the operation is simple and convenient. It is particularly suitable for measuring components such as two half couplings, whose inlet axial dimensions are smaller than the axial dimensions between the two shaft end faces to be measured in the inner cavity.

[0051] In the above structure, since the movable measuring claw 8 is placed behind the rod body 6, the end face of the sliding seat 91 located in front of the rod body 6 and facing the fixed measuring claw 7 can be used as the calibration surface 94 for reading from the scale line. The calibration surface 94 can be on the same vertical plane as the outer end face of the shortest second measuring head 11 after installation, or can be directly on the same vertical plane as the installation surface of the second measuring head 11 installed with the movable measuring claw 8. The scale on the rod body 6 corresponding to the calibration surface 94 can be defined as the sum of the length of the shortest first measuring head 10, the width of the fixed measuring claw 7, the width of the movable measuring claw 8, the distance between the fixed measuring claw 7 and the movable measuring claw 8, and the length of the shortest second measuring head 11, or can be defined as the sum of the width of the fixed measuring claw 7, the width of the movable measuring claw 8, and the distance between the fixed measuring claw 7 and the movable measuring claw 8. After reading, the difference between the lengths of the measuring heads or the length of the measuring heads can be added to calculate the axial distance dimension X between the two shaft end faces 3. In this way, when the digital display device 9 fails, it is also convenient to directly obtain the measurement result from the scale line of the rod body 6.

[0052] In order to facilitate operation, it is further preferred in this embodiment that a handle 12 is installed at one end of the rod body 6. The handle 12 is preferably a cylinder, and the end face 121 of the handle 12 facing the digital display device 9 is on the same vertical plane as the zero reference plane on the fixed measuring claw 7. The top of the fixed measuring claw 7 is connected to the handle 12, and is indirectly fixedly connected to the rod body 6 through the handle 12. When the fixed measuring claw 7 and the movable measuring claw 8 adopt the above-mentioned staggered structure, the end face 121 of the handle 12 can be used as the zero reference plane to limit the movement limit position of the movable measuring claw 8. In this way, it is not only convenient to operate, but also conducive to simplifying the structure of the measuring device.

[0053] The measuring steps of the measuring device are as follows:

[0054] 1. Keep the axial direction of the first probe 10 and the second probe 11 perpendicular to the axis of the end face 3 of the shaft to be measured in the inner cavity of the half-coupling 1, adjust the first probe 10 and the second probe 11 to the insertion position, extend the first probe 10, the second probe 11 and part of the fixed measuring claw 7 and the movable measuring claw 8 into the inner cavity of the coupling from the entrance 4, and leave the handle 12, the digital display device 9 and the rod body 6 outside the two half-couplings 1.

[0055] 2. Rotate the handle 12 and the rod body 6 to 90°, and adjust the first probe 10 and the second probe 11 to the detection position. At this time, the axial directions of the first probe 10 and the second probe 11 are parallel to the axes of the two shaft end faces 3.

[0056] 3. Slightly move the handle 12 along the axial direction of the shaft end face 3 until the outer end face of the first probe 10 is aligned with the shaft end face 3 to be measured ( Figure 1 The first probe 10 contacts the shaft end surface 3 at the middle left end and keeps the first probe 10 in contact with the shaft end surface 3.

[0057] 4. Slide the digital display device 9 along the direction of the rod body 6, and the digital display device 9 drives the movable measuring claw 8 to move until the outer end surface of the second measuring head 11 is aligned with the measured shaft end surface 3 ( Figure 1 The shaft end face 3) at the middle right end is fitted.

[0058] 5. After stabilization, read the value on the digital display screen 92 in the digital display device 9, which is the distance between the two measured shaft end faces 3 in the inner cavity of the coupling.

[0059] 6. Move the movable measuring claw 8 in the reverse direction. After the digital display screen 92 in the digital display device 9 displays "0", rotate the rod body 6 to make the axial directions of the first measuring probe 10 and the second measuring probe 11 perpendicular to the axis of the measured shaft end face 3 (i.e., the insertion position), and then take the first measuring probe 10 and the second measuring probe 11 out of the entrance 4.

[0060] 7. Complete the measurement of the distance between the shaft end faces in the inner cavity of the coupling.

[0061] like Figure 2As shown, when different length probes need to be replaced when detecting couplings of different structures, another implementation is provided in this embodiment, in which the value directly obtained in the digital display device 9 is defined as the sum H of the width of the fixed measuring jaw 7, the width of the movable measuring jaw 8, and the distance between the fixed measuring jaw 7 and the movable measuring jaw 8. The displayed value plus the length of the first measuring probe 10 and the length of the second measuring probe 11 is the distance dimension X between the two shaft end faces 3.

[0062] Another more convenient implementation can also be provided, in which the sizes of different probes can be pre-stored in the digital display device 9, and a selection function is provided in the digital display device 9. After the probe is selected, the final distance dimension X between the two shaft end faces 3 is directly displayed on the digital display 92.

[0063] The measuring device provided by the utility model has the following advantages:

[0064] 1. In the measuring device, the first probe and the second probe are installed by extending outward from the fixed probe claw and the movable probe claw, and the movable probe claw is moved along the rod body, so that the first probe and the second probe are extended into the inner cavity of the component, and then they can be abutted against the two surfaces to be measured in the inner cavity of the component, and then the distance size between the two surfaces to be measured can be directly obtained, and the measurement process is fast, accurate and reliable.

[0065] 2. The first probe and the second probe in the measuring device are detachably mounted on the fixed probe claw and the movable probe claw, and are equipped with several sets of probes of different lengths. The distance between the inner cavity surfaces to be measured of different structural components can be measured by selecting probes of different lengths. The measuring device has strong versatility and is convenient and flexible to operate.

[0066] 3. The measuring device can be inserted from the entrance by adjusting the first probe and the second probe to the insertion position where the axis direction is perpendicular to the axis of the surface to be measured, and then rotated 90° after entering the inner cavity of the component, and the first probe and the second probe are adjusted to the detection position where the axis direction is parallel to the axis of the surface to be measured to perform dimensional measurement. It is particularly suitable for measuring components such as two half-couplings whose entrance size is smaller than the inner cavity size.

[0067] The above is only a preferred embodiment of the present invention, and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents suggested above without departing from the scope of the technical solution of the present invention. The implementation schemes in the above embodiments can be further combined or replaced. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the present invention.

Claims

1. A device for measuring the internal structure dimensions of a component. It is characterized in that include: Rod body; A fixed measuring claw, one end of which is fixedly mounted on the rod body and the other end of which is detachably mounted with a first measuring head; A movable measuring claw, one end of which can be slidably mounted on the rod body and the other end of which can be detachably mounted with a second measuring head; A digital display device is slidably mounted on the rod body, connected to the movable measuring claw and slides synchronously; The first probe and the second probe are installed in opposite directions and their central axes are parallel to the rod body. During detection, the first probe and the second probe extend from the entrance on the component into the inner cavity of the component to perform detection.

2. The device for measuring the internal structure dimensions of a component according to claim 1, Features: The total thickness of the fixed measuring jaw and the movable measuring jaw in the radial direction is smaller than the axial dimension of the entrance. The first measuring head and the second measuring head are inserted from the entrance at an insertion position where their axial directions are perpendicular to the axis of the surface to be measured, and are rotated 90° to a detection position where their axial directions are parallel to the axis of the surface to be measured to perform dimension measurement.

3. The device for measuring the internal cavity structure dimensions of a component according to claim 1, Features: The first measuring head and the second measuring head are connected to the fixed measuring jaw and the movable measuring jaw via threads.

4. The device for measuring the internal structure dimensions of a component according to claim 1, Features: The fixed measuring claw and the movable measuring claw are both installed vertically relative to the rod body, and the first measuring head and the second measuring head extend vertically outward and are installed at the bottom ends of the fixed measuring claw and the movable measuring claw respectively.

5. The device for measuring the internal structure dimensions of a component according to claim 1, Features: The digital display device comprises a sliding seat slidably connected to the rod body, a digital display screen is mounted on the sliding seat, the sliding seat and the rod body are fixed at any position by fasteners, and the movable measuring claw is connected to one end of the sliding seat facing the fixed measuring claw.

6. The device for measuring the internal structure dimensions of a component according to claim 5, Features: The sliding seat is provided with a penetrating mounting hole, the shape of which matches the shape of the rod body, the rod body passes through the mounting hole, and the rod body and the mounting hole are slidably matched to enable the sliding seat to slide along the rod body.

7. The device for measuring the internal structure dimensions of a component according to claim 5, Features: The movable measuring claw is placed at the rear of the rod body, and the end face of the sliding seat located in front of the rod body and facing the fixed measuring claw is used as a calibration surface for reading from the scale line. The calibration surface is on the same vertical plane as the outer end face of the shortest second probe after installation or is directly on the same vertical plane as the installation surface of the second probe on which the movable measuring claw is installed.

8. The device for measuring the internal structure dimensions of a component according to claim 1, Features: A side surface of the fixed measuring claw facing the movable measuring claw is a zero reference surface, corresponding to a zero scale line on the rod body.

9. The device for measuring the internal structure dimensions of a component according to claim 8, Features: A handle is installed at one end of the rod body. The handle is a horizontally placed column. The top end of the fixed measuring claw is connected to the handle. The end surface of the handle facing the digital display device is in the same plane as the zero reference surface.

10. The device for measuring the internal cavity structure dimensions of a component according to any one of claims 1 to 9, Features: The component is a coupling, and the inlet is the axial gap between two half-coupling flanges. During detection, the inlet is inserted from the gap between the two flanges.

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