An inside diameter measuring device
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- QINGHAI MEASURING & CUTTING TOOLS CO LTD
- Filing Date
- 2025-07-08
- Publication Date
- 2026-06-16
Smart Images
Figure CN224365495U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of measuring instrument technology, and in particular to an internal diameter measuring device. Background Technology
[0002] The information disclosed in this background section is intended only to enhance the understanding of the general background of this disclosure and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art.
[0003] An internal diameter measuring device is a measuring instrument used to measure the inner diameter of a workpiece. In use, rotating a screw pair causes the measuring rod to retract, which in turn moves the measuring head inside the workpiece. Rotating the screw pair again causes the measuring rod to expand the measuring head until it contacts the workpiece, and the inner diameter is then read from a digital display. However, with this screw pair design, the rotation process is time-consuming, resulting in slow retraction and expansion of the measuring head, thus affecting the measurement efficiency of the internal diameter measuring device. Utility Model Content
[0004] In view of this, the purpose of this application is to provide an internal diameter measuring device, which aims to solve the technical problem of how to improve the measurement efficiency of the internal diameter measuring device.
[0005] To achieve the above objectives, the technical solution adopted in this application is as follows:
[0006] An embodiment of this application provides an inner diameter measuring device, comprising:
[0007] Measuring head;
[0008] A digital display indicator has a probe connected to the measuring head, the probe being moved in a first direction to retract the measuring head or in a second direction to expand the measuring head, the first direction and the second direction being opposite;
[0009] An operating mechanism includes a housing, a trigger, and a reset assembly. The trigger passes through the housing and is rotatably connected to it. The reset assembly is disposed within the housing and includes a first limiting member, a second limiting member, an elastic member, and a connecting rod. The first limiting member is located between the measuring rod and the second limiting member. The elastic member is connected to both the first and second limiting members and is used to drive the first limiting member to move along a second direction. The connecting rod passes through the first and second limiting members, is fixedly connected to the first limiting member, and movably connected to the second limiting member. One end of the connecting rod is fixedly connected to the measuring rod, and the other end is movably connected to one end of the trigger. The trigger is used to drive the connecting rod to move along the first direction.
[0010] In some embodiments, the elastic element is a spring, the connecting rod passes through the spring, one end of the spring abuts against the first limiting element, and the other end abuts against the second limiting element.
[0011] In some embodiments, the reset assembly further includes a first guide cylinder fixedly connected to the housing, the spring being located inside the first guide cylinder, the connecting rod and the measuring rod both passing through the first guide cylinder, and the second limiting member being connected to the end of the first guide cylinder away from the measuring rod.
[0012] In some embodiments, the reset assembly further includes a second guide cylinder located within the first guide cylinder, the connecting rod passing through the second guide cylinder and fixedly connected to the second guide cylinder, the first limiting member located within the second guide cylinder, and a portion of the spring located within the second guide cylinder.
[0013] In some embodiments, a slot is provided on the outer periphery of the connecting rod, and the reset assembly further includes a snap-fit member that engages with the slot. The end of the second guide cylinder away from the second limiting member abuts against the snap-fit member, and the end of the first limiting member away from the second limiting member abuts against the second guide cylinder.
[0014] In some embodiments, the outer peripheral side of the second limiting member is threadedly connected to the inner peripheral side of the first guide cylinder.
[0015] In some embodiments, the operating mechanism further includes an adjusting member that passes through the housing and is threadedly connected to the housing, and the adjusting member abuts against the end of the trigger away from the connecting rod.
[0016] In some embodiments, the adjusting member includes a threaded portion and a contact portion connected together, the threaded portion being threadedly connected to the housing, and the trigger having a first groove at the end away from the connecting rod, the contact portion contacting the bottom of the first groove.
[0017] In some embodiments, the reset assembly further includes a first slider, a second slider, and a connector. One end of the trigger is provided with a second groove. The connector passes through the second groove and is fixedly connected to the end of the connecting rod away from the measuring rod. An annular groove is provided on the outer periphery of the connector. The first slider is connected to one side wall of the second groove and passes through the annular groove. The second slider is connected to the other side wall of the second groove and passes through the annular groove.
[0018] In some embodiments, the reset assembly further includes a screw and a nut, the screw passing through the connector and fixedly connected to the end of the connecting rod away from the probe, and the nut located at the end of the connector away from the probe and threadedly connected to the screw.
[0019] The beneficial effects of this application are as follows:
[0020] When using the internal diameter measuring device provided in this application, gripping the trigger drives the connecting rod to move in the first direction, thereby driving the measuring rod to move in the first direction, causing the measuring head to retract. At this time, the elastic element stores elastic potential energy. Then, the measuring head is placed inside the workpiece to be measured, and then the trigger is released. At this time, the elastic potential energy is released, and the connecting rod moves in the second direction under the drive of the elastic element, thereby driving the measuring rod to move in the second direction, causing the measuring head to expand until it contacts the workpiece to be measured.
[0021] In this process, the trigger acts as a lever. When the trigger is gripped, the measuring head can contract rapidly under the action of the lever, and the elastic element stores elastic potential energy. When the trigger is released, the release of elastic potential energy allows the measuring head to expand rapidly until it contacts the workpiece to be measured. This increases the contraction and expansion speed of the measuring head, thereby improving the measurement efficiency of the internal diameter measuring device.
[0022] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description
[0023] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0024] Figure 1 This paper shows a schematic diagram of the inner diameter measuring device from one perspective in an embodiment of this application.
[0025] Figure 2 It shows Figure 1 Schematic diagram of the cross-sectional structure at point AA;
[0026] Figure 3 It shows Figure 2 A magnified structural diagram of region B in the middle;
[0027] Figure 4 It shows Figure 1 A three-dimensional structural diagram of the operating mechanism;
[0028] Figure 5 It shows Figure 4 Schematic diagram of the 3D structure behind the hidden shell Figure 1 ;
[0029] Figure 6 It shows Figure 5 A magnified structural diagram of region C in the middle;
[0030] Figure 7 It shows Figure 4 Schematic diagram of the 3D structure behind the hidden shell Figure 2 ;
[0031] Figure 8 It shows Figure 7 A magnified structural diagram of region D in the middle.
[0032] Explanation of key component symbols:
[0033] 1000-Inner diameter measuring device; 100-Measuring head; 110-Base; 120-Measuring jaws; 130-Conical component; 200-Digital display indicator; 210-Case; 220-Measuring rod; 230-Main board; 240-Display screen; 300-Operating mechanism; 310-Housing housing; 320-Trigger; 321-First groove; 322-Second groove; 330-Reset assembly; 331-First limiting component; 332-Second limiting component Limiting component; 333-Elastic component; 334-Connecting rod; 3342-Slot; 3351-First guide cylinder; 3352-Second guide cylinder; 3354-Snap-fit component; 336-First sliding component; 337-Second sliding component; 338-Connecting component; 3381-Annular groove; 3391-Screw; 3392-Nut; 340-Adjusting component; 341-Threaded part; 342-Contact part; X-First direction; Y-Second direction. Detailed Implementation
[0034] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.
[0035] In the description of this application, the terms "center", "longitudinal", "lateral", "length", "width", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not 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 application.
[0036] Furthermore, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Moreover, "above" or "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below" or "below" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0037] In the description of this application, the terms "first," "second," etc., are used to distinguish different objects and should not be construed as indicating or implying a specific order or primary / secondary relationship, or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.
[0038] In the description of this application, unless otherwise explicitly specified, the terms "installation," "connection," "attachment," etc., should be interpreted broadly. For example, they can refer to a connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0039] In the description of this application, the term "and / or" can be understood to mean three possibilities. For example, A and / or B can represent: A alone; A and B simultaneously; or B alone. Additionally, the character " / " generally indicates that the preceding and following objects have an "or" relationship.
[0040] In the description of this application, "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering. For example, if the angle between two directions is 80° to 90°, the two directions can be considered perpendicular; if the angle between two directions is 0° to 10°, the two directions can be considered parallel.
[0041] An internal diameter measuring device is a measuring instrument used to measure the internal diameter. In use, the measuring rod is rotated to retract the measuring head by rotating the screw pair. The measuring head is then placed inside the workpiece to be measured. The screw pair is rotated again to expand the measuring head until it contacts the workpiece. The internal diameter of the workpiece is then read through a digital display indicator.
[0042] However, the aforementioned screw pair design results in a prolonged rotation process, leading to slow contraction and expansion of the measuring head, which in turn affects the measurement efficiency of the internal diameter measuring device. Furthermore, during measurement, one hand must hold the measuring head or digital display indicator while the other hand rotates the screw pair, making the measurement operation inconvenient.
[0043] like Figures 1 to 3 As shown, in order to solve the above-mentioned technical problems, embodiments of this application provide an inner diameter measuring device 1000, which relates to the field of measuring instrument technology, and is mainly used to measure the inner diameter of a workpiece to be measured (the workpiece to be measured is, for example, a bearing, pipe, gasket, or other structural component with an inner hole, which is not specifically limited here). The device includes: a measuring head 100, a digital display indicator 200, and an operating mechanism 300.
[0044] The digital display indicator 200 has a measuring rod 220 connected to the measuring head 100. The measuring rod 220 is used to move along a first direction X to retract the measuring head 100 or move along a second direction Y to expand the measuring head 100. The first direction X and the second direction Y are opposite. The operating mechanism 300 includes a housing 310, a trigger 320, and a reset assembly 330. The trigger 320 passes through the housing 310 and is rotatably connected to the housing 310. The reset assembly 330 is disposed inside the housing 310 and includes a first limiting member 331, a second limiting member 332, an elastic member 333, and a connecting rod 334. A limiting member 331 is located between the measuring rod 220 and the second limiting member 332. An elastic member 333 is connected to the first limiting member 331 and the second limiting member 332 respectively, and is used to drive the first limiting member 331 to move along the second direction Y. A connecting rod 334 passes through the first limiting member 331 and the second limiting member 332. The connecting rod 334 is fixedly connected to the first limiting member 331 and movably connected to the second limiting member 332. One end of the connecting rod 334 is fixedly connected to the measuring rod 220, and the other end is movably connected to one end of the trigger 320. The trigger 320 is used to drive the connecting rod 334 to move along the first direction X.
[0045] It should be noted that "fixed connection" can be understood as: the relative positions of two objects remain unchanged under normal use conditions, that is, there is no easy relative movement between them; for example, a fixed connection can be a snap-fit, screw connection, abutment, welding, injection molding, adhesive, etc., without specific limitations. "Movable connection" can be understood as: the relative positions of two objects can change under normal use conditions, that is, there is relative movement between them; for example, a movable connection can be one of the connection methods such as sliding connection, rotational connection, etc., or any combination of two of them, without specific limitations.
[0046] For example, when using the inner diameter measuring device 1000 provided in this embodiment, gripping the trigger 320 drives the connecting rod 334 to move along the first direction X, thereby driving the measuring rod 220 to move along the first direction X, causing the measuring head 100 to contract. At this time, the elastic element 333 stores elastic potential energy. Then, the measuring head 100 is placed inside the workpiece to be measured, and then the trigger 320 is released. At this time, the elastic potential energy is released, and the connecting rod 334 moves along the second direction Y under the drive of the elastic element 333, thereby driving the measuring rod 220 to move along the second direction Y, causing the measuring head 100 to expand until it contacts the workpiece to be measured.
[0047] Understandably, in this process, trigger 320 acts as a lever. When trigger 320 is gripped, the lever action causes the measuring head 100 to retract rapidly, and the elastic element 333 stores elastic potential energy. When trigger 320 is released, the release of elastic potential energy allows the measuring head 100 to expand rapidly until it contacts the workpiece being measured. This increases the contraction and expansion speed of the measuring head 100, thereby improving the measurement efficiency of the internal diameter measuring device 1000. Furthermore, the above measurement process can be operated with one hand, making measurement more convenient.
[0048] like Figure 3 As shown, in some embodiments, the elastic element 333 is a spring, the connecting rod 334 passes through the spring, one end of the spring abuts against the first limiting element 331, and the other end abuts against the second limiting element 332.
[0049] Understandably, since the connecting rod 334 passes through the spring, it can guide the deformation of the spring during the process of the spring stretching (releasing elastic potential energy) or shortening (storing elastic potential energy), thereby increasing the stability of the spring during the deformation process.
[0050] like Figure 2 and Figure 3As shown, the reset assembly 330 further includes a first guide cylinder 3351 fixedly connected to the housing 310, the connecting rod 334 and the measuring rod 220 both pass through the first guide cylinder 3351, the spring is located inside the first guide cylinder 3351, and the second limiting member 332 is connected to the end of the first guide cylinder 3351 away from the measuring rod 220.
[0051] Understandably, since the spring is located inside the first guide cylinder 3351, and both the connecting rod 334 and the measuring rod 220 pass through the first guide cylinder 3351, the first guide cylinder 3351 can further guide the deformation of the spring during the extension or shortening process, thereby further increasing the stability of the spring during the deformation process; and the first guide cylinder 3351 also plays a protective role for the spring and the connecting rod 334, reducing the possibility of failure of the operating mechanism 300.
[0052] like Figure 2 and Figure 3 As shown, the reset assembly 330 further includes a second guide cylinder 3352 located inside the first guide cylinder 3351, a connecting rod 334 passing through the second guide cylinder 3352 and fixedly connected to the second guide cylinder 3352, a first limiting member 331 located inside the second guide cylinder 3352, and a portion of the spring located inside the second guide cylinder 3352.
[0053] Understandably, when the connecting rod 334 moves along the first direction X or the second direction Y, the second guide cylinder 3352 can slide relative to the first guide cylinder 3351, which increases the stability of the connecting rod 334 during movement; since part of the spring is located inside the second guide cylinder 3352, this further increases the stability of the spring during deformation.
[0054] like Figure 2 and Figure 3 As shown, further, a slot 3342 is provided on the outer periphery of the connecting rod 334, and the reset assembly 330 also includes a snap-fit member 3354. The snap-fit member 3354 engages with the slot 3342, so that the snap-fit member 3354 is engaged with the connecting rod 334. The end of the second guide cylinder 3352 away from the second limiting member 332 abuts against the snap-fit member 3354, and the end of the first limiting member 331 away from the second limiting member 332 abuts against the second guide cylinder 3352. In this way, under the action of the spring, the relative positions between the first limiting member 331, the second guide cylinder 3352 and the connecting rod 334 will not change, that is, the first limiting member 331 and the second guide cylinder 3352 are respectively fixedly connected to the connecting rod 334, thereby increasing the reliability of the operating mechanism 300.
[0055] For example, the snap-fit component 3354 can be selected from structural components such as snap rings, buckles, and clamps, without specific limitations.
[0056] Furthermore, the outer periphery of the second limiting member 332 is threadedly connected to the inner periphery of the first guide cylinder 3351, thereby enabling the second limiting member 332 to be detachably connected to the first guide cylinder 3351, which facilitates the assembly of the connecting rod 334, the elastic member 333 and the first limiting member 331.
[0057] like Figure 1 and Figure 2 As shown, in some embodiments, the operating mechanism 300 further includes an adjusting member 340, which passes through the housing 310 and is threadedly connected to the housing 310. The adjusting member 340 abuts against the end of the trigger 320 away from the connecting rod 334.
[0058] Understandably, by using a screwdriver or manually screwing the adjusting member 340, the adjusting member 340 can be moved relative to the housing 310, thereby adjusting the range of the rotation angle of the trigger 320, so that the inner diameter measuring device 1000 can be applied to more types of workpieces to be measured.
[0059] like Figures 4 to 6 As shown, the adjusting member 340 further includes a threaded part 341 and a contact part 342 connected to each other. The threaded part 341 is threadedly connected to the housing 310. The trigger 320 is provided with a first groove 321 at the end away from the connecting rod 334. The contact part 342 makes point contact with the bottom of the groove of the first groove 321. The point contact design makes the adjustment of the rotation angle of the trigger 320 more precise.
[0060] like Figure 6 As shown, for example, the bottom of the first groove 321 has a flat surface and the contact portion 342 has an arc surface; of course, the bottom of the first groove 321 can also have an arc surface and the contact portion 342 can have a flat surface, both of which can achieve point contact, and no specific limitation is made here.
[0061] In other embodiments, the elastic element 333 is a gas spring, an elastic metal sheet, a shape memory alloy, rubber, etc., and the type of elastic element 333 is not specifically limited here.
[0062] like Figure 2 , Figure 7 and Figure 8 As shown, in some embodiments, the reset assembly 330 further includes a first slider 336, a second slider 337, and a connector 338. One end of the trigger 320 is provided with a second groove 322. The connector 338 passes through the second groove 322 and is fixedly connected to the end of the connecting rod 334 away from the measuring rod 220. The outer periphery of the connector 338 is provided with an annular groove 3381. The first slider 336 is connected to one side of the groove wall of the second groove 322 and passes through the annular groove 3381. The second slider 337 is connected to the other side of the groove wall of the second groove 322 and passes through the annular groove 3381.
[0063] Understandably, by adopting the above structural design, the end of the connecting rod 334 away from the measuring rod 220 is movably connected to the trigger 320. In this way, there will be no interference between the rotational movement of the trigger 320 and the linear movement of the connecting rod 334, thus optimizing the operating feel.
[0064] like Figure 2 and Figure 8 As shown, the reset assembly 330 further includes a screw 3391 and a nut 3392. The screw 3391 passes through the connector 338 and is fixedly connected to the end of the connecting rod 334 away from the measuring rod 220. The nut 3392 is located at the end of the connector 338 away from the measuring rod 220 and is threadedly connected to the screw 3391. This makes the connector 338 fixedly connected to the connecting rod 334, and the threaded connection design facilitates the assembly of the connector 338.
[0065] like Figure 1 and Figure 2 As shown, in one embodiment, the measuring head 100 includes a base 110, a conical member 130, and a plurality of measuring jaws 120. The conical member 130 is disposed within the base 110 and connected to the end of the measuring rod 220 away from the connecting rod 334. The plurality of measuring jaws 120 are arranged circumferentially along the base 110. Each measuring jaw 120 is elastically connected to the base 110 and abuts against the conical surface of the conical member 130. The digital display indicator 200 includes a case 210, a main board 230, and a display screen 240. The case 210 is connected to the base 110 and the housing 310 respectively. The measuring rod 220 passes through the case 210. The main board 230 is disposed within the case 210 and integrates a fixed grid and a processor. The display screen 240 is disposed on the case 210 and electrically connected to the main board 230. The measuring rod 220 is provided with a moving grid that works in conjunction with the fixed grid.
[0066] It is understood that when using the inner diameter measuring device 1000 provided in this embodiment, gripping the trigger 320 drives the connecting rod 334 to move along the first direction X, thereby driving the measuring rod 220 to move along the first direction X, which in turn drives the conical part 130 to move along the first direction X, causing each measuring jaw 120 of the measuring head 100 to move into the base 110. At this time, the elastic element 333 stores elastic potential energy. Then, the measuring head 100 is placed inside the workpiece to be measured, and then the trigger 320 is released. At this time, the elastic potential energy is released, and the connecting rod 334 moves along the second direction Y under the drive of the elastic element 333. The measuring head 100 moves along the second direction Y, causing the measuring rod 220 to move along the second direction Y, which in turn causes the conical part 130 to move along the second direction Y. This causes each measuring jaw 120 of the measuring head 100 to move outward from the base 110 until it contacts the workpiece to be measured. During the movement of the measuring rod 220 along the second direction Y, the moving grating moves synchronously with the measuring rod 220. The relative movement between the moving grating and the fixed grating generates a voltage signal. The voltage signal is processed by the processor of the main board 230 to generate a digital signal and is transmitted to the display screen 240. The user can read the corresponding inner diameter measurement data through the display screen 240.
[0067] In the description of this application, the terms "some embodiments," "one embodiment," "example," "specific example," "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In the description of this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0068] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.
Claims
1. An inner diameter measuring device, characterized in that, include: Measuring head (100); A digital display indicator (200) has a probe (220) connected to the measuring head (100), the probe (220) being used to move in a first direction (X) to retract the measuring head (100) or to move in a second direction (Y) to expand the measuring head (100), the first direction (X) and the second direction (Y) being opposite; The operating mechanism (300) includes a housing (310), a trigger (320), and a reset assembly (330). The trigger (320) passes through the housing (310) and is rotatably connected to the housing (310). The reset assembly (330) is disposed within the housing (310) and includes a first limiting member (331), a second limiting member (332), an elastic member (333), and a connecting rod (334). The first limiting member (331) is located between the measuring rod (220) and the second limiting member (332). The elastic member (333) is connected to the first limiting member (331) and the second limiting member (332) respectively. The second limiting member (332) is connected and is used to drive the first limiting member (331) to move along the second direction (Y). The connecting rod (334) passes through the first limiting member (331) and the second limiting member (332). The connecting rod (334) is fixedly connected to the first limiting member (331) and movably connected to the second limiting member (332). One end of the connecting rod (334) is fixedly connected to the measuring rod (220), and the other end is movably connected to one end of the trigger (320). The trigger (320) is used to drive the connecting rod (334) to move along the first direction (X).
2. The inner diameter measuring device according to claim 1, characterized in that, The elastic element (333) is a spring, the connecting rod (334) passes through the spring, one end of the spring abuts against the first limiting element (331), and the other end abuts against the second limiting element (332).
3. The inner diameter measuring device according to claim 2, characterized in that, The reset assembly (330) further includes a first guide cylinder (3351) fixedly connected to the housing (310), the spring is located inside the first guide cylinder (3351), the connecting rod (334) and the measuring rod (220) are both inserted through the first guide cylinder (3351), and the second limiting member (332) is connected to the end of the first guide cylinder (3351) away from the measuring rod (220).
4. The inner diameter measuring device according to claim 3, characterized in that, The reset assembly (330) further includes a second guide cylinder (3352) located inside the first guide cylinder (3351), the connecting rod (334) passing through the second guide cylinder (3352) and fixedly connected to the second guide cylinder (3352), the first limiting member (331) located inside the second guide cylinder (3352), and a portion of the spring located inside the second guide cylinder (3352).
5. The inner diameter measuring device according to claim 4, characterized in that, The outer periphery of the connecting rod (334) is provided with a slot (3342), and the reset assembly (330) further includes a snap-fit member (3354). The snap-fit member (3354) engages with the slot (3342). The end of the second guide cylinder (3352) away from the second limiting member (332) abuts against the snap-fit member (3354), and the end of the first limiting member (331) away from the second limiting member (332) abuts against the second guide cylinder (3352).
6. The inner diameter measuring device according to claim 3, characterized in that, The outer periphery of the second limiting member (332) is threadedly connected to the inner periphery of the first guide cylinder (3351).
7. The inner diameter measuring device according to any one of claims 1 to 6, characterized in that, The operating mechanism (300) further includes an adjusting member (340), which passes through the housing (310) and is threadedly connected to the housing (310). The adjusting member (340) abuts against the end of the trigger (320) away from the connecting rod (334).
8. The inner diameter measuring device according to claim 7, characterized in that, The adjusting member (340) includes a threaded part (341) and a contact part (342) connected to each other. The threaded part (341) is threadedly connected to the housing (310). The trigger (320) has a first groove (321) at one end away from the connecting rod (334). The contact part (342) contacts the bottom of the first groove (321).
9. The inner diameter measuring device according to any one of claims 1 to 6, characterized in that, The reset assembly (330) further includes a first slider (336), a second slider (337), and a connector (338). One end of the trigger (320) is provided with a second groove (322). The connector (338) passes through the second groove (322) and is fixedly connected to the end of the connecting rod (334) away from the measuring rod (220). The outer periphery of the connector (338) is provided with an annular groove (3381). The first slider (336) is connected to one side of the groove wall of the second groove (322) and passes through the annular groove (3381). The second slider (337) is connected to the other side of the groove wall of the second groove (322) and passes through the annular groove (3381).
10. The inner diameter measuring device according to claim 9, characterized in that, The reset assembly (330) further includes a screw (3391) and a nut (3392). The screw (3391) passes through the connector (338) and is fixedly connected to the end of the connecting rod (334) away from the measuring rod (220). The nut (3392) is located at the end of the connector (338) away from the measuring rod (220) and is threadedly connected to the screw (3391).