Precision measuring instrument for inner and outer diameters

Abstract

This invention relates to the field of measuring tool technology and provides a precision measuring instrument for internal and external diameters. It includes two fixed tubes arranged side-by-side, with their ends connected by fixed blocks. Each fixed tube is equipped with an adjustment module, a measuring block assembly, a display module, and a probe adjustment assembly. This device uses a comparative measurement method to quickly and accurately cover the full-size measurement range of 300mm-3000mm, effectively reducing measurement costs. The device can reduce the influence of temperature and measuring force on dimensions and can be used for measuring and inspecting parts with small steps.

Description

Technical Field

[0001] This utility model belongs to the field of measuring tool technology, and in particular relates to a precision measuring instrument for internal and external diameters. Background Technology

[0002] Currently, the typical small-size measuring range of outside micrometers is 25mm, such as (200mm - 225mm locking lever, 225mm - 250mm locking lever). The measuring range of large-size outside micrometers is 100mm (e.g., 300mm-400mm, 500mm-600mm). When multiple measuring ranges need to be measured, multiple devices are required, resulting in high measurement costs.

[0003] The common method for using an inside micrometer is as follows: First, align the outside micrometer. Then, retract the locking device of the outside micrometer and calibrate the inside micrometer. Because the outside micrometer's state differs between locked and unlocked states, practical experience shows that the actual size of the inside micrometer calibrated using this common method often deviates from the size measured by the measuring machine. The specific deviation is unstable and is primarily determined by the measuring force of the outside micrometer.

[0004] Because of its cylindrical structure, the inside micrometer often cannot be used to measure small steps if the step being measured is smaller than the radius of the inside micrometer. Utility Model Content

[0005] The purpose of this utility model embodiment is to provide a precision measuring instrument for inner and outer diameters, which aims to solve the problems mentioned in the background art.

[0006] This utility model embodiment is implemented as follows: a precision measuring instrument for inner and outer diameters includes two fixed tubes arranged side by side, with each end of the two fixed tubes connected by a fixing block; it also includes:

[0007] The adjustment module is provided in two sets, and the two sets of adjustment modules are slidably installed at both ends of the fixed tube along the axial direction of the fixed tube. The adjustment module includes a first sliding seat slidably installed on the fixed tube along the axial direction of the fixed tube. The first sliding seat is composed of two symmetrical locking blocks, and the two locking blocks are connected to each other by a locking rod. A support screw is provided at the bottom of the first sliding seat, and an adjustment nut for adjusting the support screw is also provided at the bottom of the first sliding seat.

[0008] A spring fixing assembly is disposed on one side of a set of adjustment modules, including a second sliding seat slidably mounted on a fixed tube, and a first locking member for fixing the second sliding seat to the fixed tube is provided on the side wall of the second sliding seat, and a spring fixing rod is provided on the top of the second sliding seat;

[0009] The measuring block assembly is located on the side of the spring fixing assembly away from the adjustment module (the distance between the adjustment module and the spring fixing assembly is small). It includes a third sliding seat that is slidably mounted on the fixed tube. The side wall of the third sliding seat is provided with a second locking member for fixing the third sliding seat to the fixed tube. The top of the third sliding seat is provided with a stop post, and the stop post is provided with a first spring connector. The bottom of the third sliding seat is provided with a first spring connector.

[0010] The display module is located on the side of the measuring block assembly away from the spring fixing assembly. It includes a fourth sliding seat that is slidably mounted on the fixing tube. The side wall of the fourth sliding seat is provided with a third locking member for fixing the fourth sliding seat to the fixing tube. The top of the fourth sliding seat is provided with a measuring gauge and a second spring connector.

[0011] The probe adjustment assembly is located on one side of another set of adjustment modules. It includes a fifth sliding seat that is slidably mounted on a fixed tube. The side wall of the fifth sliding seat is provided with a fourth locking member for fixing the fifth sliding seat to the fixed tube. The bottom of the fifth sliding seat is provided with a second adjustable support rod.

[0012] In a further technical solution, the first locking member, the second locking member, the third locking member, and the fourth locking member are all adjusting screws, and the second sliding seat, the third sliding seat, the fourth sliding seat, and the fifth sliding seat are respectively provided with corresponding threaded holes on their side walls.

[0013] In a further technical solution, the measuring instrument is a high-precision dial indicator.

[0014] In a further technical solution, the fixing tube is made of carbon fiber material.

[0015] This utility model provides a precision measuring instrument for internal and external diameters. By using a comparative method, this device can quickly and accurately cover the full-size measurement range of 300mm-3000mm, effectively reducing measurement costs. The device can reduce the influence of temperature and measuring force on dimensions and can be used for measuring and inspecting parts with small steps. Attached Figure Description

[0016] Figure 1 A schematic diagram of the structure of a precision measuring instrument for inner and outer diameters provided in an embodiment of this utility model;

[0017] Figure 2 A schematic diagram of the structure of the adjustment module in a precision measuring instrument for inner and outer diameters provided in this embodiment of the present invention;

[0018] Figure 3A schematic diagram of the structure of a spring fixing assembly in a precision measuring instrument for inner and outer diameters provided in this embodiment of the present invention;

[0019] Figure 4 A schematic diagram of the structure of a measuring block assembly in an internal and external diameter precision measuring instrument provided for an embodiment of this utility model;

[0020] Figure 5 A schematic diagram of the structure of a display module in a precision measuring instrument for inner and outer diameters provided in this embodiment of the present invention;

[0021] Figure 6 This is a schematic diagram of the probe adjustment assembly in a precision measuring instrument for internal and external diameters, provided as an embodiment of the present invention.

[0022] In the attached diagram: 1. Fixed tube; 11. Fixed block; 2. Adjustment module; 21. First sliding seat; 22. Locking rod; 23. Support screw; 24. Adjusting nut; 3. Spring fixing assembly; 31. Second sliding seat; 32. First locking element; 33. Spring fixing rod; 4. Measuring block assembly; 41. Third sliding seat; 42. Second locking element; 43. Stop post; 44. First spring connector; 45. First adjustable support rod; 5. Display module; 51. Fourth sliding seat; 52. Third locking element; 53. Measuring gauge; 54. Second spring connector; 6. Measuring head adjustment assembly; 61. Fifth sliding seat; 62. Fourth locking element; 63. Second adjustable support rod. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0024] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0025] like Figures 1-6 As shown, an embodiment of the present invention provides a precision measuring instrument for inner and outer diameters, comprising two fixed tubes 1 arranged side by side, the two ends of the two fixed tubes 1 being connected by a fixing block 11; and further comprising:

[0026] Adjustment module 2, wherein two sets of adjustment module 2 are provided, and the two sets of adjustment module 2 are respectively slidably installed at both ends of the fixed tube 1 along the axial direction of the fixed tube 1, for adjusting the height of the fixed tube 1. The adjustment module 2 includes a first sliding seat 21 slidably installed on the fixed tube 1 along the axial direction of the fixed tube 1. The first sliding seat 21 is composed of two symmetrical locking blocks, and the two locking blocks are connected to each other by a locking rod 22. A support screw 23 is provided at the bottom of the first sliding seat 21, and an adjusting nut 24 for adjusting the support screw 23 is also provided at the bottom of the first sliding seat 21.

[0027] The spring fixing assembly 3 is disposed on one side of a set of adjustment modules 2, including a second sliding seat 31 slidably mounted on the fixed tube 1, and a first locking member 32 for fixing the second sliding seat 31 to the fixed tube 1 is provided on the side wall of the second sliding seat 31, and a spring fixing rod 33 is provided on the top of the second sliding seat 31.

[0028] The measuring block assembly 4 is located on the side of the spring fixing assembly 3 away from the adjustment module 2 (the distance between the adjustment module 2 and the spring fixing assembly 3 is small). It includes a third sliding seat 41 that is slidably mounted on the fixing tube 1. The side wall of the third sliding seat 41 is provided with a second locking member 42 for fixing the third sliding seat 41 to the fixing tube 1. The top of the third sliding seat 41 is provided with a stop post 43, and the stop post 43 is provided with a first spring connector 44. The bottom of the third sliding seat 41 is also provided with a first spring connector 44.

[0029] The display module 5 is located on the side of the measuring block assembly 4 away from the spring fixing assembly 3. It includes a fourth sliding seat 51 that is slidably mounted on the fixing tube 1. The side wall of the fourth sliding seat 51 is provided with a third locking member 52 for fixing the fourth sliding seat 51 to the fixing tube 1. The top of the fourth sliding seat 51 is provided with a measuring gauge 53 and a second spring connector 54.

[0030] The probe adjustment assembly 6 is located on one side of another set of adjustment modules 2. It includes a fifth sliding seat 61 that is slidably mounted on the fixed tube 1. The side wall of the fifth sliding seat 61 is provided with a fourth locking member 62 for fixing the fifth sliding seat 61 to the fixed tube 1. The bottom of the fifth sliding seat 61 is provided with a second adjustable support rod 63.

[0031] In this embodiment of the invention, calibration is first performed during use: Two V-shaped weights are placed on a simple platform. The measuring rod is then inserted into the V-shaped weights. The fifth sliding seat 61 and the second adjustable support rod 63 are adjusted to the desired measurement scale, and the fifth sliding seat 61 is fixed in place by the fourth locking member 62. The measuring block assembly 4 is adjusted until the stop post 43 contacts the measuring rod, and then the third sliding seat 41 is fixed by the second locking member 42. The fourth sliding seat 51 is adjusted until its side contacts the measuring rod, and then fixed by the third locking member 52. After fixing, the first adjustable support rod 45 and the second spring connector 54 are connected using a matching spring. Finally, the two sets of adjustment modules 2 are adjusted until the measuring gauge 53 displays a turning point data and is then zeroed.

[0032] When measuring the outer diameter, place the device on the plane of the workpiece to be measured. After adjusting the two sets of adjustment modules 2 until the measuring dial 53 shows a turning point, record the corresponding dial gauge value to obtain the ± difference of the corresponding data.

[0033] When measuring the inner diameter, place the device on the plane of the workpiece to be measured. Connect the first adjustable support rod 45 and the second spring connector 54 using the matching spring. Adjust the two sets of adjustment modules 2 until the measuring dial 53 shows a turning point, and record the corresponding dial indicator value. This yields the ± difference of the corresponding data. (Note: Since the probe diameter is 25mm, please use the corresponding gauge blocks and gauge bars during measurement calibration.)

[0034] In a preferred embodiment of the present invention, the first locking member 32, the second locking member 42, the third locking member 52, and the fourth locking member 62 are all adjusting screws, and the side walls of the second sliding seat 31, the third sliding seat 41, the fourth sliding seat 51, and the fifth sliding seat 61 are respectively provided with corresponding threaded holes.

[0035] In this embodiment of the utility model, when in use, simply turn the adjusting screw so that it passes through the threaded hole and abuts against the fixing tube 1 to fix the corresponding component onto the fixing tube 1.

[0036] like Figure 5 As shown, in a preferred embodiment of this utility model, the measuring instrument 53 is a high-precision dial indicator to ensure accuracy.

[0037] In a preferred embodiment of this utility model, the fixing tube 1 is made of carbon fiber material.

[0038] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An inner and outer diameter precision measuring instrument, characterized in that, It includes two fixed pipes arranged side by side, with each end of the two fixed pipes connected by a fixing block; it also includes: The adjustment module is provided in two sets, and the two sets of adjustment modules are slidably installed at both ends of the fixed tube along the axial direction of the fixed tube, for adjusting the height of the fixed tube; A spring fixing assembly is disposed on one side of a set of adjustment modules, including a second sliding seat slidably mounted on a fixed tube, and a first locking member for fixing the second sliding seat to the fixed tube is provided on the side wall of the second sliding seat, and a spring fixing rod is provided on the top of the second sliding seat; The measuring block assembly is located on the side of the spring fixing assembly away from the adjustment module. It includes a third sliding seat that is slidably mounted on the fixing tube. The side wall of the third sliding seat is provided with a second locking member for fixing the third sliding seat to the fixing tube. A stop post is provided on the top of the third sliding seat. A first spring connector is provided on the stop post. A first spring connector is provided on the bottom of the third sliding seat. The display module is located on the side of the measuring block assembly away from the spring fixing assembly. It includes a fourth sliding seat that is slidably mounted on the fixing tube. The side wall of the fourth sliding seat is provided with a third locking member for fixing the fourth sliding seat to the fixing tube. The top of the fourth sliding seat is provided with a measuring gauge and a second spring connector. The probe adjustment assembly is located on one side of another set of adjustment modules. It includes a fifth sliding seat that is slidably mounted on a fixed tube. The side wall of the fifth sliding seat is provided with a fourth locking member for fixing the fifth sliding seat to the fixed tube. The bottom of the fifth sliding seat is provided with a second adjustable support rod.

2. The ID-OD precision measuring instrument according to claim 1, wherein The first, second, third, and fourth locking components are all adjusting screws, and the second, third, fourth, and fifth sliding seats are respectively provided with corresponding threaded holes on their side walls.

3. The precision measuring instrument for internal and external diameters according to claim 2, characterized in that, The measuring instrument is a high-precision dial indicator.

4. The precision measuring instrument for internal and external diameters according to claim 2, characterized in that, The fixing tube is made of carbon fiber material.

5. The precision measuring instrument for internal and external diameters according to claim 1, characterized in that, The adjustment module includes a first sliding seat that is slidably mounted on the fixed tube along the axial direction of the fixed tube. The first sliding seat consists of two symmetrical locking blocks, which are connected to each other by a locking rod. A support screw is provided at the bottom of the first sliding seat, and an adjusting nut for adjusting the support screw is also provided at the bottom of the first sliding seat.

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