Simple inner taper hole diameter gauge

Abstract

The application provides a simple inner cone hole diameter gauge, relates to the technical field of gauges, and comprises a workpiece, a shell and a measuring sleeve. The measuring sleeve is elastically connected with the inner wall of the shell. A scale is arranged on the shell. The scale head is in abutment with the measuring sleeve. A protective frame is arranged on the shell. The protective frame comprises a protective sleeve. The protective sleeve is sleeved on the outer circle of the shell. The lower end of the protective sleeve is fixedly connected with a supporting leg. The lower end of the shell and the measuring sleeve is recessed in the lower end of the supporting leg. In the application, the supporting leg can help the gauge to be vertically placed on the workpiece table, so that the next workpiece to be measured is prepared. The key parts of the measuring sleeve and the shell can be recessed in the supporting leg, so that the risk of damage is reduced. The protective sleeve can also avoid the case that the oil stains on the hand or gloves directly contaminate the shell and affect the accuracy of the gauge.

Description

Technical Field

[0001] This application relates to the field of gauge technology, and more specifically, to a simple gauge for measuring the diameter of an internal conical hole. Background Technology

[0002] In machining, the taper of a cone with an internal hole is a crucial inspection parameter. Failure to measure this parameter can lead to inaccurate installation, jamming during assembly, and stress concentration. There are no dedicated measuring tools for this structure; current methods use coordinate measuring machines (CMMs) to measure the angle at a cross-section of the cone and calculate its diameter. However, CMMs are space-consuming, slow, unsuitable for on-site inspection, and costly.

[0003] In response, Chinese patent application number CN201210290524.X discloses a measuring tool for measuring the large end diameter of a conical hole. The solution mainly involves setting a retractable annular contact inside the housing. The housing rests against the end face of the conical hole, and the annular contact rests against the inner wall of the conical surface. The size of the conical hole is calculated by measuring the axial displacement between the annular contact and the housing using a gauge.

[0004] However, in the process of implementing the technical solutions in the embodiments of this application, the inventors of this application discovered that the above-mentioned technology has at least the following technical problems:

[0005] The ring-shaped contact protrudes from the outer casing and cannot be placed vertically. If placed horizontally, it is easy to bump the positioning end face of the outer casing and the gauge, affecting accuracy. Furthermore, since the ring-shaped contact is exposed, it is easily damaged and needs to be put back into the storage box after use, which is inconvenient for repeated retrieval. Summary of the Invention

[0006] To overcome the shortcomings of the existing technology, this application provides a simple internal conical hole diameter gauge, which can solve the problems mentioned in the background art.

[0007] The technical solution adopted by this application embodiment to solve its technical problem is: a simple internal conical hole diameter gauge, including a workpiece, a shell and a measuring sleeve, wherein the measuring sleeve is elastically telescopically connected to the inner wall of the shell, a gauge is provided on the shell, the gauge head abuts against the measuring sleeve, a protective frame is provided on the shell, the protective frame includes a protective sleeve, the protective sleeve is fitted on the outer circle of the shell, a support foot is fixedly connected to the lower end of the protective sleeve, and the lower ends of the shell and the measuring sleeve are recessed into the lower end of the support foot.

[0008] In one specific implementation, the outer circumference of the sheath is provided with anti-slip texture.

[0009] In one specific implementation, the lower end of the sheath and the support leg are both provided with interconnected grooves.

[0010] In one specific implementation, the outer surface of the support leg is provided with reflective strips.

[0011] In one specific implementation, a positioning claw is provided at the lower end of the outer shell, and the lower end of the positioning claw is in contact with the end face of the tapered hole on the workpiece.

[0012] In one specific implementation, the measuring sleeve includes an inner cylinder and a conical ring, the conical ring being fixedly connected to the lower end of the inner cylinder, the outer circle of the inner cylinder being slidably connected to the inner wall of the outer shell, and the conical ring being fitted against the inner wall of the conical hole on the workpiece.

[0013] In one specific implementation, a positioning screw is screwed onto the outer shell, and a vertical groove is provided on the inner cylinder to match the positioning screw.

[0014] In one specific implementation, a spring is provided at the upper end of the inner cylinder, and the two ends of the spring abut against the inner cylinder and the outer shell, respectively.

[0015] The advantages of the embodiments of this application are:

[0016] The feet help the gauge be placed vertically on the workpiece table to prepare for the next workpiece to be tested. The key parts of the measuring tube and the housing can be recessed into the feet to reduce the risk of damage. The protective sleeve can also prevent oil stains from hands or gloves from directly contaminating the housing and affecting the accuracy of the gauge. Attached Figure Description

[0017] Figure 1 A schematic diagram of the simplified internal conical hole diameter gauge provided for the embodiments of this application;

[0018] Figure 2 A schematic diagram illustrating the connection relationship between the inspection fixture and the workpiece provided in the embodiments of this application;

[0019] Figure 3 A schematic diagram of the protective frame structure provided for an embodiment of this application;

[0020] Figure 4 A schematic diagram illustrating the connection relationship between the outer shell and the positioning screw provided in this application embodiment;

[0021] Figure 5 This is a schematic diagram of the connection relationship between the inner cylinder and the conical ring provided in an embodiment of this application.

[0022] In the diagram: 10-Workpiece; 20-Outer shell; 21-Positioning claw; 30-Measuring sleeve; 31-Inner cylinder; 32-Conical ring; 33-Positioning screw; 34-Vertical groove; 35-Spring; 40-Gauge; 50-Guard frame; 51-Sheath; 52-Support leg; 53-Groove; 54-Reflective strip. Detailed Implementation

[0023] The technical solution in this application embodiment is to solve the problems mentioned in the background art above, and the overall idea is as follows:

[0024] Please see Figures 1-5 A simple internal conical hole diameter gauge includes a workpiece 10, a housing 20, and a measuring sleeve 30. The measuring sleeve 30 is elastically and telescopically connected to the inner wall of the housing 20. A gauge 40 is installed on the housing 20, with the gauge head abutting against the measuring sleeve 30. A protective frame 50 is fitted onto the housing 20, including a protective sleeve 51 that fits around the outer circumference of the housing 20. A support leg 52 is fixedly connected to the lower end of the protective sleeve 51, and the lower ends of the housing 20 and the measuring sleeve 30 are recessed into the lower end of the support leg 52. The support leg 52 helps the gauge to be placed vertically on the workpiece 10, preparing for the next workpiece 10 to be measured. The key parts of the measuring sleeve and the housing 20 can be recessed within the support leg 52, reducing the risk of damage. The protective sleeve 51 also prevents oil or grease from hands or gloves from directly contaminating the housing 20 and affecting the accuracy of the gauge.

[0025] Please see Figures 1-5 The outer circumference of the sheath 51 is provided with anti-slip texture. Here, the working environment may contain machine oil or lubricating oil, and there may be oil and sweat on the hands or gloves. The anti-slip texture makes it easier to grip and prevents slipping.

[0026] Please see Figures 1-5 Both the lower end of the sheath 51 and the support leg 52 are provided with interconnected grooves 53. Here, there may be oil and sweat on the hand or glove. When the sheath 51 is gripped, the oil and sweat will slide into the groove 53, flow along the groove 53 to the support leg 52, and then flow down, avoiding oil and sweat dripping onto the critical positions of the outer shell 20 and the measuring sleeve 30, which would affect the detection. In this embodiment, the sheath 51 and the support leg 52 are injection molded from engineering plastic and are integrally formed.

[0027] Please see Figures 1-5 The outer surface of the support leg 52 is provided with reflective strips 54. Here, reflective strips 54 are provided on both the front and the side of the support leg 52. The reflective strips 54 make it easier to mark the outer contour of the entire fixture, making it more conspicuous in the work area. This helps the fixture to be placed accurately on the workbench and also reduces the chance of other workpieces 10 or tools bumping into the fixture.

[0028] Please see Figures 1-5 The lower end of the outer shell 20 is provided with a positioning claw 21, and the lower end of the positioning claw 21 is in contact with the end face of the tapered hole on the workpiece 10. Here, the lower end face of the positioning claw 21 is used to fit with the end face of the tapered hole on the workpiece 10. A wear-resistant block is fixedly connected to the lower end of the positioning claw 21 to reduce wear, improve structural strength, and extend service life.

[0029] Please see Figures 1-5The measuring sleeve 30 includes an inner cylinder 31 and a conical ring 32. The conical ring 32 is fixedly connected to the lower end of the inner cylinder 31, and the outer circle of the inner cylinder 31 is slidably connected to the inner wall of the outer shell 20. The conical ring 32 fits against the inner wall of the conical hole on the workpiece 10. Here, the inner cylinder 31 and the inner wall of the outer shell 20 are precisely clearance-fitted to improve the detection accuracy. The conical ring 32 is provided with a conical surface for abutting against the inner wall of the conical hole on the workpiece 10. In this way, the gauge 40 can calculate a more accurate diameter of the conical hole by detecting the height difference between the conical ring 32 and the positioning claw 21. A relief groove is provided at the junction of the inner cylinder 31 and the conical ring 32 to facilitate the finishing of the outer circle of the inner cylinder 31. In this embodiment, there is an appropriate gap between the outer circle of the conical ring 32 and the inner wall of the positioning claw 21. This gap is smaller than the gap between the outer shell 20 and the inner cylinder 31, making the structure more precise and compact, and improving the detection accuracy.

[0030] Please see Figures 1-5 A positioning screw 33 is screwed onto the outer shell 20, and a vertical groove 34 is provided on the inner cylinder 31 to match the positioning screw 33. Here, the positioning screw 33 is screwed in and inserted into the vertical groove 34, which can limit the axial movement range of the inner cylinder 31 and play a limiting role. In this embodiment, the positioning screw 33 is countersunk to avoid protruding from the outer circle of the outer shell 20, so that the sheath 51 can fit over it. This can prevent oil from entering the interior of the outer shell 20 along the threads of the positioning screw 33, thus playing a role in dust and oil prevention.

[0031] Please see Figures 1-5 A spring 35 is provided at the upper end of the inner cylinder 31, with its two ends abutting against the inner cylinder 31 and the outer shell 20, respectively. Here, the spring 35 is used to keep the inner cylinder 31 in the ejected state.

[0032] When using this application: a calibration block with the same size as the conical hole of workpiece 10 needs to be made. Grip the protective sleeve 51, insert the conical sleeve into the conical hole of the calibration block, and have the four positioning claws 21 fit against the end face of the conical hole. Gently shake to ensure a tight fit. Zero the gauge 40, and then measure the conical hole of workpiece 10. The displayed value can be converted from the tangent of the conical hole's taper to calculate the diameter of the conical hole opening. After measurement, the fixture can be placed vertically aside to prepare for the next workpiece 10. The three legs 52 provide stable support, and through two supports... The gap between the feet 52 allows you to see the contact between the positioning claws 21 and the cone ring 32 and the workpiece 10. When there is oil or sweat on your hands or gloves, the liquid will slide down the sheath 51 into the groove 53, flow down the groove 53 onto the feet 52, and then flow down, preventing oil and sweat from dripping onto the critical positions of the outer shell 20 and the measuring sleeve 30, which would affect the inspection. The reflective strip 54 makes it easier to mark the outer contour of the entire fixture, making it more conspicuous in the working area. This helps the fixture to be placed accurately on the workbench and also reduces the chance of other workpieces 10 or tools bumping into the fixture.

[0033] In summary, the support leg 52 helps the fixture to be placed vertically on the workpiece 10 table to prepare for the next workpiece 10 to be tested. The key parts of the measuring tube and the housing 20 can be recessed into the support leg 52 to reduce the risk of damage. The protective sleeve 51 can also prevent oil stains from hands or gloves from directly contaminating the housing 20 and thus affecting the accuracy of the fixture.

[0034] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A simple internal conical hole diameter gauge, characterized in that, The device includes a workpiece, a housing, and a measuring sleeve. The measuring sleeve is elastically and telescopically connected to the inner wall of the housing. A gauge is provided on the housing, and the gauge head abuts against the measuring sleeve. A protective frame is fitted on the housing, and the protective frame includes a protective sleeve. The protective sleeve is fitted on the outer circle of the housing, and a support foot is fixedly connected to the lower end of the protective sleeve. The lower ends of the housing and the measuring sleeve are recessed into the lower end of the support foot.

2. The simple internal conical hole diameter gauge as described in claim 1, characterized in that, The outer circumference of the sheath is provided with anti-slip texture.

3. The simple internal conical hole diameter gauge as described in claim 2, characterized in that, The lower end of the sheath and the support legs are both provided with interconnected grooves.

4. The simple internal conical hole diameter gauge as described in claim 3, characterized in that, The outer surface of the support leg is provided with reflective strips.

5. The simple internal conical hole diameter gauge as described in claim 4, characterized in that, The lower end of the outer shell is provided with a positioning claw, and the lower end of the positioning claw is in contact with the end face of the tapered hole on the workpiece.

6. The simplified internal conical hole diameter gauge as described in claim 5, characterized in that, The measuring sleeve includes an inner cylinder and a conical ring. The conical ring is fixedly connected to the lower end of the inner cylinder, the outer circle of the inner cylinder is slidably connected to the inner wall of the outer shell, and the conical ring is fitted to the inner wall of the conical hole on the workpiece.

7. The simple internal conical hole diameter gauge as described in claim 6, characterized in that, A positioning screw is screwed onto the outer shell, and a vertical groove is provided on the inner cylinder to match the positioning screw.

8. The simple internal conical hole diameter gauge as described in claim 7, characterized in that, A spring is provided at the upper end of the inner cylinder, and the two ends of the spring abut against the inner cylinder and the outer shell, respectively.

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