Inner diameter gauge

Abstract

An inner diameter measuring meter relates to the technical field of inner diameter measuring tools and comprises a meter head, a measuring head and a meter rod, the meter rod sequentially comprises a holding section and a depth measuring section from top to bottom, the top of the holding section is fixedly connected with the bottom end of the meter head, the top of the depth measuring section is connected with the bottom end of the holding section, and the bottom end of the depth measuring section is connected with the measuring head. And the measuring head is connected with a pointer in the gauge head through a transmission part arranged in the gauge rod. By arranging the depth measuring section, depth data of a measured position can be obtained while the inner diameter of a hole is measured, so that the inner diameters of different depths of the hole can be measured, hole diameter information of different depths of different holes can be distinguished, and the hole diameter measuring device is more convenient to measure the hole diameters of different depths for a conical hole.

Description

Technical Field

[0001] This invention relates to the field of internal diameter measuring tools, specifically to an internal diameter gauge. Background Technology

[0002] In the machining and precision manufacturing industries, internal diameter measurement is a crucial step. With the continuous advancement of industrial production, higher demands are placed on the accuracy and efficiency of measuring the internal diameter of parts. Internal diameter measurement not only relates to the dimensional control of parts but also directly affects assembly accuracy and the performance of the final product.

[0003] An inside dial indicator is a measuring instrument that converts the linear displacement of a probe into the angular displacement of a pointer. It is mainly used to measure the dimensions and shape errors of different hole diameters. It employs a comparative measurement method, using the cooperation of a movable probe and a fixed probe to accurately measure the diameter and shape accuracy of the inner hole of a part.

[0004] However, traditional dial indicators, besides their inability to distinguish between holes with minute differences in diameter due to their limited accuracy, also have other limitations when used for hole diameter measurement, as follows:

[0005] 1. It can only be used for hole diameter measurement, and cannot measure the hole diameter at different depths. In actual processing, the inner diameter of the same hole is often different at different depths. The existing inner diameter dial indicator does not have the function of depth measurement, so it cannot distinguish the hole diameter at different depths.

[0006] 2. Based on the above 1, holes of the same size can be distinguished by the difference in diameter at different depths. Since the inner diameter dial indicator cannot identify the relationship between depth and diameter, it is also unable to identify the identity of the hole, especially the identity of adjacent holes.

[0007] 3. Most holes in existing mechanical structures are cylindrical, but some are tapered. The inner diameter of tapered holes changes more significantly with depth, and existing dial indicators have limited ability to measure tapered holes. Utility Model Content

[0008] This invention discloses an inner diameter measuring instrument, which aims to solve the problems described in 1-3 of the prior art.

[0009] To achieve the above objectives, the technical solution of this invention is as follows:

[0010] An internal diameter gauge includes a gauge head, a probe, and a gauge rod. The gauge rod includes a grip section and a depth measuring section from top to bottom. The top of the grip section is fixedly connected to the bottom of the gauge head. The top of the depth measuring section is connected to the bottom of the grip section. The bottom of the depth measuring section is connected to the probe. The probe is connected to a pointer inside the gauge head through a transmission component located inside the gauge rod.

[0011] Preferably, the outer wall of the depth measuring section is provided with scale lines along the longitudinal direction to characterize the hole depth.

[0012] Preferably, a positioning rod is slidably connected to the outer wall of the depth measuring section.

[0013] Preferably, the positioning rod includes a collar located in the middle, the collar being slidably connected to the outer wall of the depth measuring section and fixed relative to the outer wall of the depth measuring section by a locking member, and multiple stops being evenly distributed on the outer edge of the collar.

[0014] Preferably, the locking element is a positioning bolt that passes through the collar and is screwed to the collar.

[0015] Preferably, the locking element is a plurality of arc-shaped spring plates disposed on the inner wall of the collar, the arc-shaped spring plates being arranged longitudinally and evenly distributed on the inner wall of the collar.

[0016] Preferably, there are four stop bars arranged radially along the collar, and the outer surface of the stop bar is provided with a scale to assist the collar in aligning with the measured hole.

[0017] Preferably, the top end of the depth measuring section and the bottom end of the gripping section are fixedly connected by a locking screw, and the top end of the collar and the top end of the stop bar are coplanar on plane N.

[0018] The beneficial effects of this novel internal diameter measuring instrument:

[0019] 1. This new invention can obtain the depth data of the measured position while measuring the inner diameter of the hole by setting a depth measuring section, thereby enabling the measurement of the inner diameter of the hole at different depths and distinguishing the hole diameter information of different holes at different depths. For tapered holes, this new invention is more convenient for measuring the hole diameter at different depths.

[0020] 2. This new type of device, by setting a positioning rod that can slide and lock on the depth measurement section, can realize the centering and limiting function of the measured hole, so that the probe is locked at the required depth, further ensuring the measurement accuracy. At the same time, by adjusting the position of the positioning rod on the depth measurement section, it can be adapted to the inner diameter measurement of holes at different depths. Attached Figure Description

[0021] To more clearly illustrate the technical solution of this invention, the accompanying drawings used in the embodiments are briefly described below, which constitute a part of the specification and are used together with the embodiments of this invention to explain this invention, but do not constitute a limitation on this invention.

[0022] Figure 1 A schematic diagram of the three-dimensional structure of this novel invention;

[0023] Figure 2 A schematic diagram of the front view of this novel structure;

[0024] Figure 3 A partial structural schematic diagram of this novel invention;

[0025] Figure 4 A cross-sectional structural schematic diagram of this novel positioning rod.

[0026] 1. Meter head; 2. Grip section; 3. Locking screw; 4. Positioning rod; 5. Depth measuring section; 6. Probe; 7. Measuring hole; 41. Collar; 42. Stop bar; 43. Curved spring plate; 44. Scale. Detailed Implementation

[0027] The technical solutions of this invention will now be clearly and completely described with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0028] The following embodiments can be understood as explaining a partial structure of the present invention individually, or as explaining a larger structure of the present invention through a combination of multiple embodiments.

[0029] In this embodiment, the novel inner diameter measuring instrument, such as... Figure 1 , 2 As shown, the device includes a dial indicator head 1, a probe head 6, and a dial indicator rod. The dial indicator rod, from top to bottom, includes a grip section 2 and a depth measuring section 5. The top of the grip section 2 is fixedly connected to the bottom of the dial indicator head 1. The top of the depth measuring section 5 is connected to the bottom of the grip section 2, and the bottom of the depth measuring section 5 is connected to the probe head 6. The probe head 6 is connected to a pointer inside the dial indicator head 1 via a transmission component located within the dial indicator rod. The transmission component is a common structure in existing dial indicators and will not be described in detail here. This device, by incorporating the depth measuring section 5, can obtain depth data at the measured location while measuring the inner diameter of a hole. This allows for the measurement of the inner diameter at different depths of a hole and the differentiation of hole diameter information at different depths. For tapered holes, this device is particularly convenient for measuring the hole diameter at different depths.

[0030] In this embodiment, as Figure 1 , 2 As shown in Figure 3, the outer wall of the depth measuring section 5 is provided with scale lines along the longitudinal direction to characterize the hole depth.

[0031] In this embodiment, as Figure 1 , 2 As shown in Figures 4 and 5, a positioning rod 4 is slidably connected to the outer wall of the depth measuring section 5.

[0032] In this embodiment, as Figure 1 , 2As shown in Figure 4, the positioning rod 4 includes a collar 41 located in the middle. The collar 41 is slidably connected to the outer wall of the depth measuring section 5 and is fixed relative to the outer wall of the depth measuring section 5 by a locking member. Multiple stop bars 42 are evenly distributed on the outer edge of the collar 41.

[0033] In this embodiment, as Figure 1 , 2 As shown in Figure 4, the locking component is a positioning bolt that passes through the collar 41 and is screwed to the collar (a common structure, not shown in the figure).

[0034] In this embodiment, as Figure 1 , 2 As shown in Figure 4, the locking element consists of multiple arc-shaped spring plates 43 disposed on the inner wall of the collar 41. The arc-shaped spring plates 43 are arranged longitudinally and evenly distributed on the inner wall of the collar 41. By setting the arc-shaped spring plates, the positioning rod can move freely along the depth measuring section and be locked at the desired position.

[0035] In this embodiment, as Figure 1 , 2 As shown in Figure 4, there are four stop bars 42 arranged radially along the collar 41. The outer surface of the stop bars 42 is provided with a scale 44 to assist the collar 41 in aligning with the measured hole 7. To achieve coaxiality (i.e., alignment) between the collar and the measured hole 7, it is only necessary to make the scale lines of the four stop bars aligned with the inner wall of the hole have the same value. After alignment, the accuracy of the inner diameter measurement can be improved, and errors caused by the tilt of the scale bars can be prevented.

[0036] In this embodiment, as Figure 1 , 2 As shown, the top end of the depth measuring section 5 and the bottom end of the gripping section 2 are fixedly connected by a locking screw 3, and the top end of the collar and the top end of the stop bar are coplanar on plane N.

[0037] In this embodiment, as Figure 3 As shown, the scale mark A on the depth measurement section represents the distance from the probe's central axis to point A. Point A in the figure represents the minimum scale mark, that is, when the positioning rod is moved down to plane N and aligned with the scale mark at point A, and the stop bar is in contact with the upper port of the hole, the diameter of the hole measured by the probe is the diameter of the hole at the minimum depth. Similarly, when it is necessary to measure a deeper hole diameter, simply move the positioning rod up to plane N and the position corresponding to the required depth data. By aligning each stop bar with the edge of the upper port of the hole to the same scale mark, the obtained data is the inner diameter at that depth.

[0038] The working principle of this new type:

[0039] Traditional dial indicators cannot identify the hole being measured based on its diameter at different depths when measuring parts with small differences between adjacent holes. This new invention, by incorporating a depth measuring section and a positioning rod that can slide and lock on this section, can accurately control the probe's entry into a specific depth of the hole being measured. This is particularly advantageous when the measured depth of the hole has specific requirements.

[0040] For example, when measuring the diameter of a 5mm deep hole, the user can adjust the positioning rod to the designated position according to the scale markings and lock it in place. Then, the probe is inserted into the hole for alignment, aligning the stop bar with the upper end of the hole. This ensures the accuracy of the inner diameter at that depth. Since the positioning rod can move up and down along the depth measurement section, its position can be flexibly adjusted according to the depth of the hole to meet the diameter measurement needs of holes at different depths, improving the practicality of this invention. Through the above setup, this invention ensures that the measuring head accurately reaches the measurement position, effectively distinguishes the type of hole being measured, and avoids data confusion caused by small differences in hole diameter.

Claims

1. An internal diameter gauge characterised in that: The depth measuring ruler comprises a ruler head, a measuring head and a ruler rod, the ruler rod comprises a holding section and a depth measuring section from top to bottom, the top of the holding section is fixedly connected with the bottom end of the ruler head, the top end of the depth measuring section is connected with the bottom end of the holding section, and the bottom end of the depth measuring section is connected with the measuring head.

2. An internal diameter gauge according to claim 1, characterised in that: The outer wall of the depth measuring section is longitudinally provided with scale lines for representing hole depth.

3. An internal diameter gauge according to claim 2, characterised in that: The outer wall of the depth measuring section is slidably connected with a positioning rod.

4. An internal diameter gauge according to claim 3, characterised in that: The positioning rod comprises a sleeve ring in the middle, the sleeve ring is slidably connected with the outer wall of the depth measuring section and is oppositely fixed with the outer wall of the depth measuring section through a locking member, and the outer edge of the sleeve ring is uniformly provided with a plurality of stop rods.

5. An internal diameter gauge according to claim 4, characterised in that: The locking member is a positioning bolt penetrating through the sleeve ring and being screwed with the sleeve ring.

6. An internal diameter gauge according to claim 5, characterised in that: The locking member is a plurality of arc spring plates provided on the inner wall of the sleeve ring, the arc spring plates are longitudinally arranged and uniformly distributed on the inner wall of the sleeve ring.

7. An internal diameter gauge according to claim 6, characterised in that: The stop rods are four and are radially arranged on the sleeve ring, and the outer surface of the stop rods is provided with a scale ruler for assisting the sleeve ring and the measured hole to be aligned.

8. An internal diameter gauge according to claim 7, characterised in that: The top end of the depth measuring section and the bottom end of the holding section are fixedly connected through a locking screw, and the top end of the sleeve ring and the top end of the stop rod are coplanar on a plane N.

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