Inspection tool for measuring inner diameter

Abstract

The utility model discloses a gauge for measuring an inner diameter, which comprises a dial indicator and a sealing frame, the dial indicator comprises a dial plate for displaying and a detection rod slidably connected with the dial plate, the sealing frame is internally provided with an accommodating cavity, the dial plate is arranged in the accommodating cavity, and the side wall of the sealing frame is provided with a through hole; one end of the sealing pipe is connected with the through hole, and one end of the detection rod penetrates through the through hole and is slidably arranged in the sealing pipe; the detection probe is connected with the sealing pipe in a sliding mode, one end of the detection probe abuts against the detection rod, and the other end of the detection probe extends out of the sealing pipe to measure the inner diameter. According to the utility model, the dial plate in the dial gauge is hidden in the accommodating cavity in the sealing frame, so that dust and other impurities are prevented from entering the dial plate from a gap between the detection rod and the dial plate, and the service life of the dial gauge is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of inner diameter measurement, in particular to a measuring tool for measuring inner diameter. Background Art

[0002] For the measurement of various inner diameters, a dial indicator is generally inserted into the workpiece so that the detection rod of the dial indicator rests on the inner wall of the workpiece to be measured, and the extension and contraction of the detection rod is converted into a dial reading, thereby reading the inner diameter value of the workpiece to be measured.

[0003] However, since the dial and the detection rod in the dial indicator are slidably connected, there is a certain gap between the detection rod and the dial, and impurities such as dust can easily enter the dial through the gap, causing damage to the dial and the inability to extend and retract the detection rod. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the utility model is to propose a gauge for measuring the inner diameter, which is used to solve the problems in the prior art that impurities such as dust easily enter the dial through the gap between the dial and the detection rod, causing damage to the dial and the detection rod being unable to retract.

[0005] The utility model solves the technical problem by adopting a technical solution that is a gauge for measuring inner diameter, comprising a dial gauge, the dial gauge comprising a dial for display and a detection rod slidably connected to the dial, and further comprising:

[0006] A sealing frame, wherein the sealing frame has a receiving cavity, the dial is arranged in the receiving cavity, and a through hole is provided on a side wall of the sealing frame;

[0007] A sealing tube, one end of which is connected to the through hole, and one end of the detection rod passes through the through hole and is slidably disposed in the sealing tube;

[0008] The detection probe is slidably connected to the sealing tube, one end of the detection probe abuts against the detection rod, and the other end extends out of the sealing tube to measure the inner diameter.

[0009] Furthermore, the outer diameter of the detection probe is equal to the inner diameter of the sealing tube;

[0010] The sealing tube has a sealing hole in it, the detection rod is slidably arranged in the sealing hole, and the inner diameter of the sealing hole is equal to the outer diameter of the detection rod.

[0011] Furthermore, a return spring is arranged between the detection probe and the sealing tube.

[0012] Furthermore, a limiting groove is provided on the tube wall of the sealing tube along its length direction, and a limiting protrusion is provided on the detection probe, and the limiting protrusion can extend into the limiting groove and slide along the length direction of the sealing tube.

[0013] Furthermore, the sealing tube has a first connecting section located inside the through hole and a second connecting section located outside the through hole, the diameter of the second connecting section is larger than that of the first connecting section, so as to form a step sealing surface at the connection between the first connecting section and the second connecting section, and the step sealing surface is in contact with the side wall of the sealing frame.

[0014] Furthermore, an extension rod is provided at one end of the sealing frame away from the sealing tube, one end of the extension rod is fixedly connected to the sealing frame, and the other end is threadedly connected to a fixed probe rod.

[0015] Furthermore, the sealing frame is arranged in a hexahedron, and the sealing frame includes a top plate, a bottom plate and four side plates, and the top plate, the bottom plate and the four side plates together form the sealed accommodating cavity.

[0016] Furthermore, the top plate is made of transparent glass material.

[0017] Compared with the prior art, the utility model has at least the following beneficial effects:

[0018] The dial of the dial indicator is hidden in the accommodating cavity in the sealing frame to prevent dust and other impurities from entering the dial through the gap between the detection rod and the dial, thereby extending the service life of the dial indicator; then, the through hole is sealed by a sealing tube, and the detection probe slides to drive the detection rod to extend and retract, which is then converted into a numerical change of the dial to obtain the reading of the inner diameter to be measured. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the inspection tool in the embodiment;

[0020] Figure 2 It is a structural schematic diagram of a dial indicator, a detection probe and a sealing tube in the embodiment;

[0021] Figure 3 It is a structural schematic diagram of a dial indicator and a detection probe in the embodiment;

[0022] In the figure:

[0023] 100, sealing frame;

[0024] 200, sealing tube; 201, first connecting section; 202, second connecting section; 203, step sealing surface; 204, limiting groove; 210, detection probe; 211, limiting protrusion; 220, extension rod; 230, fixed probe rod; 240, reset spring;

[0025] 300, dial indicator; 310, dial; 320, testing rod. DETAILED DESCRIPTION

[0026] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0027] Please refer to Figure 1-Figure 3 The utility model discloses a gauge for measuring inner diameter, comprising a dial gauge 300, wherein the dial gauge 300 comprises a dial 310 for displaying and a detection rod 320 slidably connected to the dial 310, and further comprises:

[0028] A sealing frame 100, wherein the sealing frame 100 has a receiving cavity, the dial 310 is disposed in the receiving cavity, and a through hole is provided on a side wall of the sealing frame 100;

[0029] A sealing tube 200, one end of which is connected to the through hole, and one end of the detection rod 320 passes through the through hole and is slidably disposed in the sealing tube 200;

[0030] The detection probe 210 is slidably connected to the sealing tube 200 , one end of the detection probe 210 abuts against the detection rod 320 , and the other end extends out of the sealing tube 200 to measure the inner diameter.

[0031] Specifically, the present application hides the dial 310 in the dial indicator 300 in the accommodating cavity within the sealing frame 100 to prevent dust and other impurities from entering the dial 310 through the gap between the detection rod 320 and the dial 310, thereby extending the service life of the dial indicator 300; then, the through hole is sealed by the sealing tube 200, and the detection probe 210 slides to drive the detection rod to extend and retract, which is then converted into a numerical change of the dial 310 to obtain the reading of the inner diameter to be measured.

[0032] Further, the outer diameter of the detection probe 210 is equal to the inner diameter of the sealing tube 200;

[0033] The sealing tube 200 has a sealing hole therein, the detection rod 320 is slidably disposed in the sealing hole, and the inner diameter of the sealing hole is equal to the outer diameter of the detection rod 320 .

[0034] The outer diameter of the detection probe 210 is equal to the inner diameter of the sealing tube 200, so that the detection probe 210 and the sealing tube 200 are overfitted to avoid the detection probe 210 from shaking left and right, thereby improving the measurement accuracy.

[0035] The outer diameter of the detection rod 320 is equal to the inner diameter of the sealing hole, so that the detection rod 320 will not shake left and right, thereby improving the measurement accuracy. At the same time, it can also prevent impurities such as dust from entering the accommodating space through the gap between the detection rod 320 and the sealing hole to damage the dial 310.

[0036] Furthermore, a return spring 240 is provided between the detection probe 210 and the sealing tube 200 .

[0037] A reset spring 240 is provided. When the detection probe 210 abuts against the inner wall of the workpiece to be measured, it slides inward from behind, compressing the reset spring 240 and causing the reading of the dial 310 to change. When the measurement is completed, the detection probe 210 is released, and the detection probe 210 slides outward to the initial position under the action of the reset spring 240.

[0038] Furthermore, a limiting groove 204 is provided on the tube wall of the sealing tube 200 along its length direction, and a limiting protrusion 211 is provided on the detection probe 210 . The limiting protrusion 211 can extend into the limiting groove 204 and slide along the length direction of the sealing tube 200 .

[0039] A limiting protrusion 211 and a limiting groove 204 are provided. When the detection probe 210 slides outward until the limiting protrusion 211 abuts against one end of the limiting groove, the detection probe 210 cannot continue to slide outward, thereby preventing the detection probe 210 from falling off from the sealing tube 200; when the detection probe 210 slides inward until the limiting protrusion 211 abuts against the other end of the limiting groove, the detection probe 210 cannot continue to slide inward, thereby preventing the reset spring 240 from being over-compressed, and at the same time preventing the detection rod 320 from over-contracting and damaging the dial 310.

[0040] Furthermore, the sealing tube 200 has a first connecting section 201 located inside the through hole and a second connecting section 202 located outside the through hole, wherein the diameter of the second connecting section 202 is larger than that of the first connecting section 201, so as to form a step sealing surface 203 at the connection between the first connecting section 201 and the second connecting section 202, and the step sealing surface 203 is in contact with the side wall of the sealing frame 100.

[0041] Specifically, a step sealing surface 203 is formed at the connection between the second connecting section 202 and the first connecting section 201, and the step sealing surface 203 is fitted with the side wall of the sealing frame 100, so as to achieve sealing of the through hole and prevent dust from entering the accommodating space and damaging the dial 310.

[0042] Furthermore, an extension rod 220 is provided at one end of the sealing frame 100 away from the sealing tube 200 , one end of the extension rod 220 is fixedly connected to the sealing frame 100 , and the other end is threadedly connected to a fixed probe rod 230 .

[0043] During measurement, one end of the fixed probe rod 230 is pressed against one side of the workpiece to be measured, and the detection probe 210 is pressed against the other side of the workpiece to be measured, thereby measuring the distance between the two sides.

[0044] At the same time, since the fixed probe rod 230 is threadedly connected to the extension rod 220, when the inner diameter to be measured is larger, the longer fixed probe rod 230 can be replaced and the reading of the dial 310 can be recalibrated before measuring the workpiece with a larger inner diameter.

[0045] Furthermore, the sealing frame 100 is arranged in a hexahedron, and the sealing frame 100 includes a top plate, a bottom plate and four side plates, and the top plate, the bottom plate and the four side plates together form the sealed accommodating cavity.

[0046] Furthermore, the top plate is made of transparent glass material.

[0047] The top plate is made of a light-transmitting glass material, and the user can directly read the dial 310 through the top plate.

[0048] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0049] In addition, in the present invention, the descriptions of "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0050] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A gauge for measuring inner diameter, comprising a dial gauge, the dial gauge comprising a dial for display and a detection rod slidably connected to the dial, characterized in that: Also includes: A sealing frame, wherein the sealing frame has a receiving cavity, the dial is arranged in the receiving cavity, and a through hole is provided on a side wall of the sealing frame; A sealing tube, one end of which is connected to the through hole, and one end of the detection rod passes through the through hole and is slidably disposed in the sealing tube; The detection probe is slidably connected to the sealing tube, one end of the detection probe abuts against the detection rod, and the other end extends out of the sealing tube to measure the inner diameter.

2. A gauge for measuring inner diameter according to claim 1, characterized in that: The outer diameter of the detection probe is equal to the inner diameter of the sealing tube; The sealing tube has a sealing hole in it, the detection rod is slidably arranged in the sealing hole, and the inner diameter of the sealing hole is equal to the outer diameter of the detection rod.

3. A gauge for measuring inner diameter according to claim 1, characterized in that: A return spring is arranged between the detection probe and the sealing tube.

4. A gauge for measuring inner diameter according to claim 1, characterized in that: A limiting groove is provided on the tube wall of the sealing tube along the length direction thereof, and a limiting protrusion is provided on the detection probe. The limiting protrusion can extend into the limiting groove and slide along the length direction of the sealing tube.

5. A gauge for measuring inner diameter according to claim 1, characterized in that: The sealing tube has a first connecting section located in the through hole and a second connecting section located outside the through hole, wherein the diameter of the second connecting section is larger than that of the first connecting section, so as to form a step sealing surface at the connection between the first connecting section and the second connecting section, and the step sealing surface is in contact with the side wall of the sealing frame.

6. A gauge for measuring inner diameter according to claim 1, characterized in that: An extension rod is arranged at one end of the sealing frame away from the sealing tube, one end of the extension rod is fixedly connected to the sealing frame, and the other end of the extension rod is threadedly connected to a fixed probe rod.

7. A gauge for measuring inner diameter according to claim 1, characterized in that: The sealing frame is arranged in a hexahedron, and comprises a top plate, a bottom plate and four side plates. The top plate, the bottom plate and the four side plates together form the sealed accommodating cavity.

8. A gauge for measuring inner diameter according to claim 7, characterized in that: The top plate is made of transparent glass material.

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