Multi-section aperture measuring device

Abstract

This utility model relates to a multi-section aperture measuring device, comprising: a rod-shaped body, the axis of which is a reference axis, and multiple mounting slots on the rod-shaped body; N measuring units, each measuring unit comprising M measuring components evenly distributed in a ring around the reference axis, each measuring component comprising: a measuring rod, the length direction of which is consistent with the direction of the reference axis, the middle part of which is a hinge portion that is hinged to the inner wall of the mounting slot, one end of the measuring rod being a measuring part, and the other end being a limiting part; a pen-type displacement sensor placed alongside the measuring rod, the measuring rod being located outside the pen-type displacement sensor along the radial direction of the rod-shaped body; an extension portion fixedly connected to the measuring part and located in front of the contact of the pen-type displacement sensor; and an elastic element in a compressed state, elastically connecting the measuring rod to the rod-shaped body, thereby making full use of the installation space, using a pen-type displacement sensor for multi-section aperture measurement, and reducing manufacturing costs.

Description

Technical Field

[0001] This utility model relates to the field of aperture measurement technology, and in particular to a multi-section aperture measurement device. Background Technology

[0002] Currently, the measuring device for multi-section aperture measurement is usually a rod-shaped structure. Since each measuring element needs to extend into the hole, the installation space is limited. Multiple micro sensors are usually set on multiple cross sections along the axial direction of the rod-shaped structure. A drive rod pushes the probe to move, and the displacement change is reflected on the micro sensors. The displacement of the probe is measured by the change of strain force in the micro sensors.

[0003] When the inner hole to be measured is long, and multiple cross-sectional diameters need to be measured simultaneously, a large number of miniature sensors need to be configured on a single measuring device. For example, if a diameter measuring rod with seven cross-sections is needed, four measuring points need to be arranged on each cross-section, for a total of 28 measuring points, a total of 28 miniature sensors are required, which is expensive. Utility Model Content

[0004] In response to the shortcomings of the existing production technology, the applicant provides a multi-section aperture measuring device, which enables the measurement of apertures across multiple sections by using a pen-type displacement sensor, thereby reducing manufacturing costs and making full use of the installation space.

[0005] The technical solution adopted in this utility model is as follows:

[0006] A multi-section aperture measuring device, comprising:

[0007] A rod-shaped body, wherein the axis of the rod-shaped body is a reference axis, and the rod-shaped body is provided with multiple mounting grooves, the depth direction of the mounting grooves being consistent with the radial direction of the rod-shaped body;

[0008] N measuring units are used to measure the diameter of N cross-sections within the same hole, where N is greater than or equal to two. The N measuring units are spaced apart along a reference axis. Each measuring unit includes M measuring components evenly distributed in a ring around the reference axis, where M is greater than or equal to two. Each measuring component includes:

[0009] The measuring rod has its length direction aligned with the reference axis direction. The middle part of the measuring rod's length direction is a hinged part that is hinged to the inner wall of the mounting groove. The swing surface of the measuring rod passes through the reference axis. One end of the measuring rod's length direction is a measuring part, and the other end is a limiting part.

[0010] A pen-type displacement sensor is fixedly installed inside the mounting slot and is placed side by side with the measuring rod, which is located on the outside of the pen-type displacement sensor along the radial direction of the rod-shaped body.

[0011] An extension is fixedly connected to the measuring part and located in front of the contact of the pen-type displacement sensor, and the extension is in contact with the end of the contact;

[0012] An elastic element, in a compressed state, elastically connects the measuring rod to the rod-shaped body.

[0013] During measurement, the measuring rod swings under the action of external force while the contact moves and further compresses the elastic element. The pen-type displacement sensor outputs a measurement signal for calculating the aperture.

[0014] As a further improvement to the above technical solution:

[0015] The pen-type displacement sensor is pneumatically driven. The pen-type displacement sensor is provided with a fixed base, which is fixedly connected to the inner wall of the mounting groove. One end of the elastic element is connected to the limiting part, and the other end of the elastic element is connected to the fixed base. The extension is provided with a first initial state limiting part corresponding to the bottom of the mounting groove.

[0016] Before measurement, the first initial state limiting member contacts the bottom of the mounting groove to keep the elastic member in a compressed state and to position the measuring protrusion on the measuring part within the mounting groove;

[0017] During measurement, the pen-type displacement sensor moves its contact under the drive of compressed air, pushing the extension to make the measuring rod swing and further compress the elastic element until the measuring protrusion contacts the hole wall to be measured. Then, the pen-type displacement sensor outputs a measurement signal for calculating the hole diameter.

[0018] The pen-type displacement sensor is spring-driven, and a fixed base is provided on the pen-type displacement sensor. The fixed base is fixedly connected to the inner wall of the mounting groove. One end of the elastic element is connected to the extension, and the other end of the elastic element is connected to the bottom of the mounting groove. A second initial state limiting element corresponding to the fixed base is provided on the limiting part.

[0019] Before measurement, the second initial state limiting member contacts the fixed seat to keep the elastic member in a compressed state and to make the measuring protrusion of the measuring part located outside the mounting groove;

[0020] During measurement, after the measuring protrusion contacts the wall of the hole to be measured, the measuring protrusion swings toward the reference axis, causing the measuring rod to swing and further compress the elastic element. At the same time, the extension applies pressure to the contact to move the contact. The pen-type displacement sensor outputs a measurement signal for calculating the hole diameter.

[0021] It also includes a safety limiter for limiting the maximum compression of the elastic element.

[0022] A bearing is installed on the hinge, and a rotation center shaft is installed on the side wall of the mounting groove on both sides of the hinge. The two rotation center shafts are simultaneously fixedly connected to the inner ring of the bearing.

[0023] Each measuring unit has M mounting slots on the outer wall of its rod-shaped body, and the M mounting slots are evenly distributed in a ring around the reference axis.

[0024] The outer wall of the rod-shaped body is provided with a through groove. The depth direction of the through groove is consistent with the radial direction of the rod-shaped body, and the length direction of the through groove is consistent with the direction of the reference axis. There is a row of mounting grooves between every two adjacent through grooves. The side wall of the mounting groove is provided with a through hole, and the through hole connects the mounting groove with the through groove.

[0025] The connecting wire of the pen-type displacement sensor adjacent to the through slot is fixedly installed in the through slot, and the connecting section of the connecting wire that connects to the pen-type displacement sensor passes through the through hole.

[0026] The pen-type displacement sensor is pneumatic. The connecting line includes a main pipe and branch pipes corresponding to and connected to each pen-type displacement sensor. The main pipe is fixedly installed in the through slot. Multiple tee connectors corresponding to the mounting slots of the pen-type displacement sensors are connected in series on the main pipe. The branch pipe connectors of the tee connectors pass through the through holes and are connected to the corresponding branch pipes. When the main pipe is connected to an air source, compressed air is provided to each pen-type displacement sensor through the branch pipes to drive the contact to move.

[0027] It also includes a plurality of first baffles located in the mounting slot, each mounting slot corresponding to a first baffle. A fixing part is provided at one end of the first baffle. The fixing part is detachably fixed to the bottom of the mounting slot. The fixing part and the extension part are respectively located at both ends of the pen-type displacement sensor. The first baffle and the measuring rod are arranged side by side along the reference axis on the outside of the same pen-type displacement sensor.

[0028] It also includes multiple second baffles, which correspond to the through groove and are fixedly connected to the rod-shaped body to enclose the connecting line in the through groove.

[0029] One end of the through groove extends to the fixed end of the rod-shaped body along its length. The second baffle and the end of the through groove located at the fixed end of the rod-shaped body are spaced apart to form an outlet, and the connecting line passes through the outlet.

[0030] The beneficial effects of this utility model are as follows:

[0031] This utility model has a compact and reasonable structure and is easy to operate. The pen-type displacement sensor for each measurement section is located inside the rod-shaped body. The straight rod-shaped measuring rod and the pen-type displacement sensor are arranged side by side. An extension is provided at the end of the measuring rod in front of and in contact with the contact of the pen-type displacement sensor. This reduces the space occupied by the measuring rod and the pen-type sensor along the radial direction of the rod-shaped body, thereby reducing the diameter of the aperture measuring device, making full use of the installation space, and using the pen-type displacement sensor to measure the aperture of multiple sections, thus reducing manufacturing costs.

[0032] This utility model also has the following advantages:

[0033] (1) Install a bearing on the hinge part, and fix the rotating center shaft connected to the inner ring of the bearing to the side wall of the mounting groove, thereby hinge the hinge part to the mounting groove, so that the measuring rod swings smoothly and avoids the influence of factors such as cutting fluid in the hole to be measured and dust in the field environment, which may cause the measuring rod to jam and affect the measurement data.

[0034] (2) An installation groove is set between two adjacent through grooves. The length of the through groove extends along the reference axis. A through hole is set on the installation groove to connect the through groove. A connecting line is fixedly set in the through groove to realize the centralized arrangement and segmented connection of the connecting lines of the pen displacement sensor in the same row of installation grooves, thereby reducing the influence of the arrangement of the sensor lines on the diameter of the measuring device.

[0035] (3) Set up the main pipeline of the pen displacement sensor in the corresponding side of the slot in a through slot, set up multiple T-connectors on the main pipeline, and lead out a branch pipeline. The optimal design of the air supply pipeline of the pneumatic pen displacement sensor is achieved by connecting the branch pipeline with the pen displacement sensor, thereby reducing the space occupied by the air supply pipeline. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the structure of the multi-section aperture measuring device of this utility model.

[0037] Figure 2 for Figure 1 Enlarged view of a portion of point A in the middle.

[0038] Figure 3 This is a schematic diagram of the measuring component in Embodiment 2 of this utility model.

[0039] Figure 4 This is an exploded view of the multi-section aperture measuring device of this utility model.

[0040] Figure 5 for Figure 4 Enlarged view of section B in the middle.

[0041] Figure 6This is a schematic diagram of the installation structure of the measuring rod of this utility model.

[0042] Figure 7 This is a schematic diagram of the mounting groove and related structures of this utility model.

[0043] Figure 8 This is a schematic diagram of the measuring component in Embodiment 3 of this utility model.

[0044] in:

[0045] 1. Rod-shaped body; 10. Reference axis; 11. Mounting groove; 12. Through groove; 13. Through hole; 14. Shaft hole; 15. Through hole; 16. Outlet;

[0046] 21. First baffle; 211. Fixing part; 22. Second baffle;

[0047] 3. Measuring rod; 31. Measuring protrusion; 32. Measuring part; 33. Hinge part; 331. Rotation center shaft; 332. Bearing; 333. Locking threaded pin; 34. Limiting part;

[0048] 4. Pen-type displacement sensor; 40. Contact; 41. Mounting base;

[0049] 5. T-joint; 6. Flexible element;

[0050] 7. Extension; 71. Contact protrusion; 721. First initial state limiting member; 722. Second initial state limiting member; 723. Safety limiting member. Detailed Implementation

[0051] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0052] Example 1:

[0053] like Figures 1-4 As shown, the multi-section aperture measuring device of this embodiment includes: a rod-shaped body 1 and N measuring units.

[0054] The rod-shaped body 1 has an axis that is a reference axis 10. The rod-shaped body 1 has multiple mounting grooves 11, and the depth direction of the mounting grooves 11 is consistent with the radial direction of the rod-shaped body 1.

[0055] N measurement units are used to measure the diameter of N cross sections within the same hole, where N is greater than or equal to two. The N measurement units are spaced apart along the reference axis 10. Each measurement unit includes M measurement components that are evenly distributed in a ring around the reference axis 10, where M is greater than or equal to two.

[0056] Each measuring component includes a measuring rod 3, a pen-type displacement sensor 4, an extension 7, and an elastic element 6.

[0057] Measuring rod 3, the length direction of measuring rod 3 is consistent with the direction of reference axis 10, the middle part of the length direction of measuring rod 3 is a hinge part 33 that is hinged to the inner wall of mounting groove 11, the swing surface of measuring rod 3 passes through reference axis 10, one end of the length direction of measuring rod 3 is a measuring part 32, and the other end is a limiting part 34.

[0058] The pen-type displacement sensor 4 is fixedly installed inside the mounting slot 11 and is parallel to the measuring rod 3. The measuring rod 3 is located on the outside of the pen-type displacement sensor 4 along the radial direction of the rod-shaped body 1.

[0059] The extension 7 is fixedly connected to the measuring part 32 and located in front of the contact 40 of the pen-type displacement sensor 4. The extension 7 is in contact with the end of the contact 40.

[0060] The elastic element 6, in a compressed state, elastically connects the measuring rod 3 to the rod-shaped body 1.

[0061] During measurement, the measuring rod 3 swings under the action of external force while the contact 40 moves and further compresses the elastic element 6. The pen-type displacement sensor 4 outputs a measurement signal for calculating the aperture.

[0062] When not measuring, the external force disappears, and the measuring rod 3 and the elastic element 6 return to their original positions.

[0063] Specifically, the length direction of the measuring rod 3 is consistent with the direction of the reference axis 10. This means that before and after the measuring rod 3 swings, the angle between the axis of the measuring rod 3 and the length direction of the reference axis 10 changes slightly, but the general direction of extension remains the same. The pen-type displacement sensor 4 is a contact displacement sensor. The number of measuring rods 3 in each measurement section is M, and the number of contact points with the wall of the hole to be measured is M. The number of contact points is set according to the size requirements of the hole to be measured; M can be 2, 4, or 6, used for diameter or position measurement, such as... Figure 5 As shown, there are four measuring rods 3; the elastic element 6 is a compression spring.

[0064] Each pen-type displacement sensor 4 for each measurement section is located inside the rod-shaped body 1. A straight rod-shaped measuring rod 3 and a pen-type displacement sensor 4 are arranged side by side. An extension 7 is provided at the end of the measuring rod 3, which is located in front of and in contact with the contact 40 of the pen-type displacement sensor 4. This reduces the space occupied by the measuring rod 3 and the pen-type displacement sensor 4 along the radial direction of the rod-shaped body 1, thereby reducing the diameter of the aperture measuring device, making full use of the installation space, and using pen-type displacement sensors for multi-section aperture measurement, thus reducing manufacturing costs.

[0065] The pen-type displacement sensor 4 measures displacement by direct contact with the object being measured. Common pen-type displacement sensors 4 include spring-driven and air-driven types. The spring-driven sensor uses external pressure to extend and retract the contact 40, thereby achieving contact and measurement with the object being measured. The air-driven sensor uses compressed air to push the contact 40 out to contact the object being measured for measurement.

[0066] The external force driving method and the initial state of the measuring rod 3 before measurement referred to in this embodiment are different depending on the type of pen displacement sensor 4.

[0067] In this embodiment, as Figure 5 As shown, a bearing 332 is installed on the hinge part 33, and a rotation center shaft 331 is installed on the side wall of the mounting groove 11 on both sides of the hinge part 33. The two rotation center shafts 331 are simultaneously fixedly connected to the inner ring of the bearing 332.

[0068] Specifically, such as Figure 5 , Figure 6 , Figure 7 As shown, the mounting groove 11 has a shaft hole 14 on its side wall, which is threaded to the rotary center shaft 331. The opposite ends of the two rotary center shafts 331 press against the inner ring of the bearing 332 from both sides. The position of the measuring rod 3 is adjusted by adjusting the installation depth of the rotary center shaft 331 in the shaft hole 14, so that the swing surface of the measuring rod 3 passes through the reference axis 10. In addition, the rod-shaped body 1 on the outside of the mounting groove 11 is also provided with a through hole 15 that passes through the shaft hole 14. A locking threaded pin 333 is installed in the through hole 15. The locking threaded pin 333 contacts the rotary center shaft 331 to prevent the rotary center shaft 331 from rotating.

[0069] A bearing 332 is installed on the hinge part 33. The rotation center shaft 331 connected to the inner ring of the bearing 332 is fixedly connected to the side wall of the mounting groove 11, thereby hinged the hinge part 33 to the mounting groove 11, so that the measuring rod 3 swings smoothly and avoids the influence of factors such as cutting fluid in the hole to be measured and dust in the field environment, which may cause the measuring rod 3 to jam and affect the measurement data.

[0070] In this embodiment, as Figure 1 , Figure 5 As shown, each measuring unit has M mounting slots 11 on the outer wall of the rod-shaped body 1. The M mounting slots 11 are evenly distributed in a ring around the reference axis 10.

[0071] The outer wall of the rod-shaped body 1 is provided with a through groove 12. The depth direction of the through groove 12 is consistent with the radial direction of the rod-shaped body 1, and the length direction of the through groove 12 is consistent with the direction of the reference axis 10. There is a row of mounting grooves 11 between every two adjacent through grooves 12. The side wall of the mounting groove 11 is provided with a through hole 13, which connects the mounting groove 11 and the through groove 12.

[0072] The connecting wire of the pen-type displacement sensor 4 adjacent to the through groove 12 is fixedly installed in the through groove 12, and the connecting section of the connecting wire that connects to the pen-type displacement sensor 4 passes through the through hole 13.

[0073] Specifically, the number of through slots 12 is the same as the number of mounting slots 11 in the same cross section of the rod-shaped body 1. Preferably, the connecting line in the through slot 12 is connected to the pen-type displacement sensor 4 on the same side of the through slot 12.

[0074] An installation groove 11 is provided between two adjacent through grooves 12. The length direction of the through groove 12 extends along the reference axis 10. A through hole 13 is provided on the installation groove 11 to connect the through groove 12. A connecting line is fixedly installed in the through groove 12 to realize the centralized arrangement and segmented connection of the connecting lines of the pen-type displacement sensor 4 in the same row of installation grooves 11, thereby reducing the influence of the arrangement of the sensor lines on the diameter of the measuring device.

[0075] like Figure 4 As shown, the multi-section aperture measuring device of this embodiment also includes a plurality of first baffles 21 located in the mounting groove 11. Each mounting groove 11 corresponds to a first baffle 21. A fixing part 211 is provided at one end of the first baffle 21. The fixing part 211 is detachably and fixedly connected to the bottom of the mounting groove 11. The fixing part 211 and the extension part 7 are respectively located at both ends of the pen displacement sensor 4. The first baffle 21 and the measuring rod 3 are arranged side by side on the outside of the same pen displacement sensor 4 along the reference axis 10.

[0076] Without affecting the swing of the measuring rod 3, a first baffle 21 is installed in each mounting slot 11 to close the mounting slot 11 and protect the pen-type displacement sensor 4.

[0077] like Figure 4 , Figure 5 As shown, the multi-section aperture measuring device of this embodiment also includes a plurality of second baffles 22, which correspond to the through groove 12 and are fixedly connected to the rod-shaped body 1, thus enclosing the connecting line in the through groove 12.

[0078] Specifically, the second baffle 22 can be arc-shaped, making the measuring device as a whole circular rod. There can be multiple baffles along the reference axis 10. The diameter of the projection of the first baffle 21, the second baffle 22 and the rod-shaped body 1 along the reference axis 10 is smaller than the diameter of the hole to be measured.

[0079] A second baffle 22 is installed on the through groove 12 to limit the connecting wire within the through groove 12, thereby fixing the connecting wire and improving the overall integrity of the measuring device.

[0080] Specifically, one end of the through groove 12 extends to the fixed end of the rod-shaped body 1 along its length. The second baffle 22 is spaced apart from the end of the through groove 12 located at the fixed end of the rod-shaped body 1 to form an outlet 16, and the connecting line passes through the outlet 16.

[0081] The connecting wires within each through-slot 12 lead out from the outlet 16 and connect to the control device and signal acquisition device. The fixed end is the part where the rod-shaped body 1 connects to the mechanism that drives the measuring device to move.

[0082] Example 2:

[0083] Based on Example 1, such as Figure 3 , Figure 5 , Figure 6 As shown, in this embodiment of the multi-section aperture measuring device, the pen-type displacement sensor 4 is an air-driven type. The external force driving method and the installation method of the measuring rod 3 are as follows:

[0084] The pen-type displacement sensor 4 is provided with a fixed base 41, which is fixedly connected to the inner wall of the mounting groove 11. One end of the elastic member 6 is connected to the limiting part 34, and the other end of the elastic member 6 is connected to the fixed base 41. The extension part 7 is provided with a first initial state limiting member 721 corresponding to the bottom of the mounting groove 11.

[0085] Before measurement, the first initial state limiting member 721 contacts the bottom of the mounting groove 11 to keep the elastic member 6 in a compressed state and to keep the measuring protrusion 31 on the measuring part 32 in the mounting groove 11.

[0086] During measurement, the pen-type displacement sensor 4 moves its contact 40 under the drive of compressed air, pushing the extension 7 to make the measuring rod 3 swing and further compress the elastic element 6 until the measuring protrusion 31 contacts the hole wall of the hole to be measured. Then, the pen-type displacement sensor 4 outputs a measurement signal for calculating the hole diameter.

[0087] In other words, when using the pneumatic pen-type displacement sensor 4, the measuring rod 3 is in a retracted state when the measuring device is not in a measuring state. During measurement, the contact 40 is pushed out by compressed air, which drives the measuring rod 3 to swing, and the measuring part 32 contacts the hole wall of the hole to be measured.

[0088] Specifically, such as Figure 3 As shown, the extension 7 is provided with a contact protrusion 71 that contacts the contact 40. The first initial state limiting member 721 keeps the contact protrusion 71 in contact with the contact 40 and does not apply force to the contact 40.

[0089] For the pneumatic pen displacement sensor 4, the connecting wires include an air tube for air supply, which requires more installation space. Therefore, the installation method of the connecting wires of the pneumatic pen displacement sensor 4 on the rod-shaped body 1 needs to be optimized.

[0090] Specifically, such as Figure 6 , Figure 7 As shown, the pen-type displacement sensor 4 is pneumatically driven. The connecting line includes a main pipeline and branch pipelines corresponding to and connected to each pen-type displacement sensor 4. The main pipeline is fixedly installed in the through groove 12. Multiple T-connectors 5, which correspond one-to-one with the mounting groove 11 where the pen-type displacement sensor 4 is located, are connected in series on the main pipeline. The branch pipe connectors of the T-connectors 5 are inserted into the through holes 13. The branch pipe connectors are connected to the corresponding branch pipelines. When the main pipeline is connected to an air source, compressed air is provided to each pen-type displacement sensor 4 through the branch pipelines to drive the contact 40 to move.

[0091] The branch pipe joint and branch pipe are the connection sections that connect to the pen-type displacement sensor 4 as referred to in Embodiment 2.

[0092] A main pipeline for the pen-type displacement sensor 4, which is installed in the corresponding side mounting slot 11, is set in a through slot 12. Multiple T-connectors 5 are set on the main pipeline to lead out a branch pipeline. The optimal design of the air supply pipeline for the pneumatic pen-type displacement sensor 4 is achieved by connecting the branch pipeline to the pen-type displacement sensor 4, thereby reducing the space occupied by the air supply pipeline.

[0093] Example 3:

[0094] Based on Example 1, such as Figure 8 As shown, in the multi-section aperture measuring device of this embodiment, the pen-type displacement sensor 4 is spring-driven. The pen-type displacement sensor 4 is provided with a fixed seat 41, which is fixedly connected to the inner wall of the mounting groove 11. One end of the elastic member 6 is connected to the extension 7, and the other end of the elastic member 6 is connected to the bottom of the mounting groove 11. The limiting part 34 is provided with a second initial state limiting member 722 corresponding to the fixed seat 41.

[0095] Before measurement, the second initial state limiting member 722 contacts the fixed seat 41 to keep the elastic member 6 in a compressed state and to keep the measuring protrusion 31 of the measuring part 32 outside the mounting groove 11.

[0096] During measurement, after the measuring protrusion 31 contacts the wall of the hole to be measured, the measuring protrusion 31 swings toward the reference axis 10, causing the measuring rod 3 to swing and further compress the elastic element 6. At the same time, the extension 7 applies pressure to the contact 40, causing the contact 40 to move. The pen-type displacement sensor 4 outputs a measurement signal for calculating the hole diameter.

[0097] In other words, when using a spring-driven pen-type displacement sensor 4, the measuring rod 3 is in an open state when the measuring device is not in a measuring state. During measurement, the measuring part 32 contacts the hole wall of the hole to be measured and applies pressure to the measuring rod 3. The measuring rod 3 swings and drives the contact 40 to move.

[0098] The multi-section aperture measuring device of this embodiment also includes a safety limiter 723 for limiting the maximum compression of the elastic member 6.

[0099] When the extension 7 drives the contact 40 to move beyond the range of the pen displacement sensor 4 after the measuring rod 3 swings, the pen displacement sensor 4 will be damaged. The safety limit member 723 is used to prevent accidental pressing of the measuring protrusion 31.

[0100] Specifically, the safety limiter 723 is detachably and fixedly installed on the fixed base 41. The safety limiter 723 is located outside the limiting part 34. When the safety limiter 723 contacts the limiting part 34, the compression of the elastic member 6 is at its maximum. The safety limiter 723 can also be detachably and fixedly installed on the extension part 7. The safety limiter 723 is located on the extension part 7 and faces the bottom of the mounting groove 11. When the bottom of the mounting groove 11 contacts the safety limiter 723, the compression of the elastic member 6 is at its maximum.

[0101] In the above embodiments:

[0102] Pen-type displacement sensors are commercially available products.

[0103] When using a pneumatic pen-type displacement sensor 4, the diameter of the pen-type displacement sensor 4 can be 8mm, and the diameter of the measuring device can be as small as 60mm, which can measure holes with a diameter of 60mm. This type of measuring device is suitable for measuring the camshaft hole of the diesel engine cylinder head (with a diameter of about 62mm). Of course, if a smaller pen-type displacement sensor 4 is developed, the diameter of the measuring device can be further reduced, which can be adapted to the measurement of smaller diameter holes.

[0104] Since the spring-driven pen displacement sensor 4 has a diameter of 8mm, and also has smaller diameters of 6mm and 3mm, without considering the probe being retracted when not measuring, the spring-driven pen displacement sensor 4 can be used to further reduce the diameter of the measuring device using the pen displacement sensor 4 as the measuring element.

[0105] The above description is an explanation of the present utility model and not a limitation thereof. The scope of the present utility model is defined by the claims. Within the protection scope of the present utility model, any form of modification may be made.

Claims

1. A multi-cross-section aperture measurement device, characterized by: include: A rod-shaped body (1) with its axis being a reference axis (10) and a plurality of mounting grooves (11) provided on the rod-shaped body (1), the depth direction of which is consistent with the radial direction of the rod-shaped body (1); N measuring units are used to measure the diameter of N cross-sections within the same hole, where N is greater than or equal to two. The N measuring units are spaced apart along the reference axis (10). Each measuring unit includes M measuring components evenly distributed in a ring around the reference axis (10), where M is greater than or equal to two. Each measuring component includes: Measuring rod (3), the length direction of the measuring rod (3) is consistent with the direction of the reference axis (10), the middle part of the length direction of the measuring rod (3) is a hinge part (33) that is hinged to the inner wall of the mounting groove (11), the swing surface of the measuring rod (3) passes through the reference axis (10), one end of the length direction of the measuring rod (3) is a measuring part (32), and the other end is a limiting part (34); A pen-type displacement sensor (4) is fixedly installed inside the mounting groove (11) and is placed side by side with the measuring rod (3). The measuring rod (3) is located outside the pen-type displacement sensor (4) along the radial direction of the rod-shaped body (1). The extension (7) is fixedly connected to the measuring part (32) and located in front of the contact (40) of the pen displacement sensor (4), and the extension (7) is in contact with the end of the contact (40); The elastic element (6), in a compressed state, elastically connects the measuring rod (3) to the rod-shaped body (1); During measurement, the measuring rod (3) swings under the action of external force while the contact (40) moves and further compresses the elastic element (6). The pen-type displacement sensor (4) outputs a measurement signal for calculating the aperture.

2. The multi-cross-section aperture measurement device of claim 1, wherein: The pen-type displacement sensor (4) is pneumatically driven. The pen-type displacement sensor (4) is provided with a fixed base (41). The fixed base (41) is fixedly connected to the inner wall of the mounting groove (11). One end of the elastic member (6) is connected to the limiting part (34), and the other end of the elastic member (6) is connected to the fixed base (41). The extension part (7) is provided with a first initial state limiting member (721) corresponding to the bottom of the mounting groove (11). Before measurement, the first initial state limiting member (721) contacts the bottom of the mounting groove (11) to keep the elastic member (6) in a compressed state and to make the measuring protrusion (31) on the measuring part (32) located in the mounting groove (11); During measurement, the pen-type displacement sensor (4) moves the contact (40) under the drive of compressed air and pushes the extension (7) to make the measuring rod (3) swing and further compress the elastic element (6) until the measuring protrusion (31) contacts the hole wall of the hole to be measured. Then, the pen-type displacement sensor (4) outputs a measurement signal for calculating the hole diameter.

3. The multi-cross-section aperture measurement device of claim 1, wherein: The pen-type displacement sensor (4) is spring-driven. The pen-type displacement sensor (4) is provided with a fixed seat (41). The fixed seat (41) is fixedly connected to the inner wall of the mounting groove (11). One end of the elastic member (6) is connected to the extension (7). The other end of the elastic member (6) is connected to the bottom of the mounting groove (11). The limiting part (34) is provided with a second initial state limiting member (722) corresponding to the fixed seat (41). Before measurement, the second initial state limiting member (722) contacts the fixed seat (41) to keep the elastic member (6) in a compressed state and to make the measuring protrusion (31) of the measuring part (32) located outside the mounting groove (11); During measurement, after the measuring protrusion (31) contacts the hole wall of the hole to be measured, the measuring protrusion (31) swings toward the reference axis (10), causing the measuring rod (3) to swing and further compress the elastic element (6). At the same time, the extension (7) applies pressure to the contact (40) to move the contact (40), and the pen-type displacement sensor (4) outputs a measurement signal for calculating the hole diameter.

4. The multi-cross-sectioned aperture measurement device of claim 3, wherein: It also includes a safety limiter (723) for limiting the maximum compression of the elastic element (6).

5. The multi-cross-section aperture measurement device of claim 1, wherein: A bearing (332) is installed on the hinge part (33), and a rotary center shaft (331) is installed on the side wall of the mounting groove (11) on both sides of the hinge part (33). The two rotary center shafts (331) are simultaneously fixedly connected to the inner ring of the bearing (332).

6. The multi-cross-sectioned aperture measurement device of claim 1, wherein: Each measuring unit has a rod-shaped body (1) with M mounting slots (11) on its outer wall. The M mounting slots (11) are evenly distributed in a ring around the reference axis (10). The outer wall of the rod-shaped body (1) is provided with a through groove (12). The depth direction of the through groove (12) is consistent with the radial direction of the rod-shaped body (1). The length direction of the through groove (12) is consistent with the direction of the reference axis (10). There is a row of mounting grooves (11) between every two adjacent through grooves (12). The side wall of the mounting groove (11) is provided with a through hole (13). The through hole (13) connects the mounting groove (11) and the through groove (12). The connecting wire of the pen-type displacement sensor (4) adjacent to the through groove (12) is fixedly installed in the through groove (12), and the connecting section of the connecting wire connected to the pen-type displacement sensor (4) passes through the through hole (13).

7. The multi-cross-sectioned aperture measurement device of claim 6, wherein: The pen-type displacement sensor (4) is pneumatic. The connecting line includes a main pipeline and branch pipelines corresponding to and connected to each pen-type displacement sensor (4). The main pipeline is fixedly installed in the through slot (12). Multiple tee connectors (5) corresponding one-to-one with the mounting slot (11) where the pen-type displacement sensor (4) is located are connected in series on the main pipeline. The branch pipe connectors of the tee connectors (5) are inserted into the through hole (13). The branch pipe connectors are connected to the corresponding branch pipelines. When the main pipeline is connected to an air source, compressed air is provided to each pen-type displacement sensor (4) through the branch pipelines to drive the contact (40) to move.

8. The multi-cross-sectioned aperture measurement device of claim 6, wherein: It also includes a plurality of first baffles (21) located in the mounting groove (11), each mounting groove (11) corresponding to a first baffle (21), a fixing part (211) is provided at one end of the first baffle (21), the fixing part (211) is detachably fixed to the bottom of the mounting groove (11), the fixing part (211) and the extension part (7) are respectively located at both ends of the pen displacement sensor (4), the first baffle (21) and the measuring rod (3) are arranged side by side along the reference axis (10) on the outside of the same pen displacement sensor (4).

9. The multi-cross-sectioned aperture measurement device of claim 6, wherein: It also includes multiple second baffles (22), which correspond to the through groove (12) and are fixedly connected to the rod-shaped body (1) to enclose the connecting line in the through groove (12).

10. The multi-cross-sectioned aperture measurement device of claim 9, wherein: One end of the through groove (12) extends to the fixed end of the rod-shaped body (1) along its length. The second baffle (22) and the end of the through groove (12) located at the fixed end of the rod-shaped body (1) are spaced apart to form an outlet (16). The connecting line passes through the outlet (16).

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