Thread depth measuring device and measuring method

Abstract

The invention discloses a thread depth measuring device and method, and relates to the technical field of measuring tool gauges.The thread depth measuring device comprises a thread not-go end, a main ruler body and a thread go end, the thread not-go end and the thread go end are arranged at the two ends of the main ruler body respectively, a handle is arranged on the side, close to the thread not-go end, of the main ruler body, and a vernier caliper is movably connected to the main ruler body; one side of the vernier caliper is provided with a fixing nut, and the vernier caliper is movably connected with the main caliper body through the fixing nut. The two ends of the main ruler body are provided with the thread no-go end and the thread no-go end, through thread specification matching and standard thread angle design, thread specification precision inspection and scale matching of the main ruler body and the vernier caliper are achieved, the thread depth can be accurately measured in combination with positioning of the limiting block, and the antiskid design of the handle and the fixing nut ensure stable operation and accurate reading. The device is simple in structure and accurate in measurement, and can quickly complete thread depth detection and specification judgment.

Description

Technical Field

[0001] The present invention relates to the technical field of measuring tools and inspection tools, and particularly to a thread depth measuring device and a measuring method. Background Art

[0002] A thread depth gauge is a commonly used measuring tool. The thread depth gauge can be used to measure the depth of a thread, and can also be used to measure the inner and outer diameters of a thread, the inner and outer diameters of a pipe, and the aperture, etc. For traditional thread depth measurement methods, tools such as ordinary rulers and depth micrometers are used, which have the problems of cumbersome operation and low measurement efficiency, and it is difficult to simultaneously complete the detection of thread specification accuracy. Although some special measuring instruments can achieve measurement, they have complex structures and high costs, and are not suitable for small and medium-sized enterprises and on-site rapid detection scenarios. In addition, the existing measuring tools lack a comprehensive consideration of operation convenience and reading accuracy in design. The poor anti-slip performance of the handle causes the hand to slip easily during measurement, affecting measurement stability. The fixed structure of the measuring device is unreasonable, and displacement is likely to occur during the reading process, resulting in measurement errors. Moreover, the applicability of the measuring device is limited and it is difficult to meet the usage requirements in different scenarios. Therefore, those skilled in the art have provided a thread depth measuring device and a measuring method to solve the problems raised in the above background art. Summary of the Invention

[0003] The purpose of the present invention is to provide a thread depth measuring device and a measuring method to solve the problems raised in the above background art.

[0004] To achieve the above purpose, the present invention provides the following technical solutions: A thread depth measuring device and a measuring method, including a thread no-go end, a main scale body, a thread go end, and a limiting mechanism. The thread no-go end and the thread go end are respectively arranged at both ends of the main scale body. A handle is arranged on one side of the main scale body close to the thread no-go end. A vernier caliper is movably connected to the main scale body. A fixing nut is arranged on one side of the vernier caliper, and the vernier caliper is movably connected to the main scale body through the fixing nut. And limiting mechanisms are symmetrically arranged on the vernier caliper.

[0005] As a further solution of the present invention: The limiting mechanism includes a limiting block, a limiting buckle, a limiting rod, a pressing rod, a return spring, and a rotating shaft. There are two groups of vernier calipers arranged symmetrically. Limiting blocks are fixedly connected to one side of each vernier caliper. A limiting rod is arranged on the limiting block. A limiting buckle is movably connected to the limiting rod. A rotating shaft is movably connected to one side of the limiting buckle. The limiting buckle is movably connected to a pressing rod through the rotating shaft. A return spring is arranged between the pressing rod and the limiting block.

[0006] As a further solution of the present invention: mounting members are provided on one side of the vernier caliper close to the main scale body, a rubber pad is provided between the mounting members, and mounting holes are symmetrically formed on the mounting members, and bolts are mounted on the mounting holes.

[0007] As a further solution of the present invention: scale tables are provided on one side surface of the main scale body and the vernier caliper, the scale unit of the scale table is millimeter, and the scale lines of the scale table of the vernier caliper are arranged parallel and corresponding to the scale lines of the scale table of the main scale body.

[0008] As a further solution of the present invention: the thread specification of the thread no-go end matches the thread specification of the thread go end, and the thread profile angles of the thread no-go end and the thread go end are both standard thread profile angles, and the thread length of the thread no-go end does not exceed two pitches.

[0009] As a further solution of the present invention: the limiting block is vertically connected to the vernier caliper, and a limiting card slot is formed on the surface of the vernier caliper, and the limiting card slot and the limiting buckle cooperate with each other.

[0010] As a further solution of the present invention: the main scale body is made of high-strength stainless steel material, and its surface is subjected to anti-rust treatment.

[0011] As a further solution of the present invention: the main scale body is replaced with a cylindrical, quadrangular prism and hexagonal prism shape, and the graduation value of the scale tables of the main scale body and the vernier caliper is between 0.02-0.05 millimeters.

[0012] A measuring method of a thread depth measuring device includes the following steps: S1: Screw the thread go end into the threaded hole to be measured and rotate it to the bottom of the threaded hole; S2: Push the vernier caliper to slide along the chute of the main scale body so that the limiting block at one end of the vernier caliper is closely attached to the end face of the threaded hole to be measured; S3: When the limiting block is tightly attached, the pressing rod will drive the limiting buckle to cooperate with the limiting card slot to stabilize the main scale body, and then tighten the fixing nut to fix the position of the vernier caliper on the main scale body; S4: Read the scale value on the left side of the scale line of the vernier caliper on the scale table of the main scale body as the integer part; S5: Then read the scale line value aligned with the scale table of the main scale body on the scale table of the vernier caliper, and multiply this value by the graduation value of the vernier caliper to obtain the decimal part; S6: Add the integer part and the decimal part to obtain the depth measurement value of the threaded hole to be measured; S7: Screw the thread no-go end into the threaded hole to be measured. If the screwing depth of the thread no-go end does not exceed two pitches, it is determined that the accuracy meets the requirements.

[0013] Compared with the prior art, the beneficial effects of the present invention are: The thread specification of the thread not-go gauge matches that of the thread go gauge, and the thread profile angles of both are standard thread profile angles. The thread length of the thread not-go gauge does not exceed two pitches. When measuring the thread, the thread go gauge is used to detect whether the actual size of the thread is within the specified tolerance range and can smoothly enter the thread to be measured; while the thread not-go gauge is used to detect whether the actual size of the thread exceeds the specified tolerance range. Under normal circumstances, the thread not-go gauge should not enter the thread to be measured. In this way, it can be judged whether the dimensional accuracy of the thread to be measured meets the requirements; Both the main scale body and one side surface of the vernier caliper are provided with scale tables, with the scale unit being millimeters. The scale lines of the scale table of the vernier caliper are arranged parallel and corresponding to those of the scale table of the main scale body, and the graduation values of the scale tables of the main scale body and the vernier caliper are between 0.02 - 0.05 millimeters. When measuring, place the object to be measured between the main scale body and the vernier caliper. By observing the alignment of the scale tables of the main scale body and the vernier caliper, the size of the object can be accurately measured. Mounting parts, rubber pads and bolts: On one side of the vernier caliper close to the main scale body, mounting parts are provided. A rubber pad is arranged between the mounting parts, and mounting holes are symmetrically opened on the mounting parts. Bolts are installed on the mounting holes. The function of the rubber pad is to increase the stability during measurement and prevent scratching the surface of the object to be measured. By fixing the mounting parts with bolts, the relative position between the vernier caliper and the main scale body can be ensured to be stable, thereby improving the measurement accuracy; There are two groups of vernier calipers arranged symmetrically. On one side of each group of vernier calipers, a limit block is fixedly connected. A limit rod is arranged on the limit block, and a limit buckle is movably connected to the limit rod. One side of the limit buckle is movably connected to a rotating shaft. The limit buckle is movably connected to a pressing rod through the rotating shaft. A return spring is arranged between the pressing rod and the limit block. When it is necessary to fix the position of the vernier caliper, press the pressing rod. The pressing rod drives the limit buckle to rotate through the rotating shaft, so that the limit buckle is stuck into the limit slot opened on the surface of the vernier caliper to realize the limit fixation of the vernier caliper. When it is necessary to move the vernier caliper, press the pressing rod again, and the limit buckle is separated from the limit slot. Under the action of the return spring, the pressing rod and the limit buckle return to their original positions, and the vernier caliper can move freely. Description of the Drawings

[0014] Figure 1 It is a measurement three-dimensional schematic diagram of a thread depth measurement device.

[0015] Figure 2 It is a matching schematic diagram of the vernier caliper and the main scale body in a thread depth measurement device.

[0016] Figure 3 It is a structural schematic diagram of the limit mechanism in a thread depth measurement device.

[0017] Figure 4 It is a matching schematic diagram of the pressing rod and the limit buckle in the limit mechanism of a thread depth measurement device.

[0018] Figure 5 It is a schematic diagram of the measurement process in a thread depth measuring device.

[0019] In the figure: 1. Thread not-go gauge; 2. Main scale body; 3. Vernier caliper; 4. Fixed nut; 5. Handle; 6. Thread go gauge; 7. Limit card slot; 8. Limit mechanism; 801. Limit block; 802. Limit buckle; 803. Limit rod; 804. Pressure rod; 805. Return spring; 806. Rotating shaft; 9. Mounting part; 10. Rubber pad; 11. Mounting hole. Specific embodiments

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] Embodiment 1

[0022] Referring to Figures 1-4 , this embodiment provides a thread depth measuring device and a measuring method, including a thread not-go gauge 1, a main scale body 2, a thread go gauge 6 and a limit mechanism 8. The thread not-go gauge 1 and the thread go gauge 6 are respectively arranged at both ends of the main scale body 2. A handle 5 is arranged on one side of the main scale body 2 close to the thread not-go gauge 1. A vernier caliper 3 is movably connected to the main scale body 2. A fixed nut 4 is arranged on one side of the vernier caliper 3. The vernier caliper 3 is movably connected to the main scale body 2 through the fixed nut 4, and the limit mechanism 8 is symmetrically arranged on the vernier caliper 3.

[0023] In this embodiment, specifically, the limit mechanism 8 includes a limit block 801, a limit buckle 802, a limit rod 803, a pressure rod 804, a return spring 805 and a rotating shaft 806. Two groups of vernier calipers 3 are symmetrically arranged. Limit blocks 801 are fixedly connected to one side of each vernier caliper 3. A limit rod 803 is arranged on the limit block 801. A limit buckle 802 is movably connected to the limit rod 803. A rotating shaft 806 is movably connected to one side of the limit buckle 802. A pressure rod 804 is movably connected to the limit buckle 802 through the rotating shaft 806. A return spring 805 is arranged between the pressure rod 804 and the limit block 801; Mounting parts 9 are arranged on one side of each vernier caliper 3 close to the main scale body 2. A rubber pad 10 is arranged between the mounting parts 9, and mounting holes 11 are symmetrically opened on the mounting parts 9. Bolts are installed on the mounting holes 11; Both the main scale body 2 and one side surface of the vernier caliper 3 are provided with scale tables. The scale unit of the scale tables is millimeter, and the scale lines of the scale table of the vernier caliper 3 are arranged in parallel correspondence with the scale lines of the scale table of the main scale body 2; The thread specification of the thread not-go gauge 1 matches that of the thread go gauge 6. Both the thread not-go gauge 1 and the thread go gauge 6 have a standard thread profile angle, and the thread length of the thread not-go gauge 1 does not exceed two pitches; The surface of the handle 5 is provided with anti-slip patterns. The anti-slip patterns are staggered concave and convex stripes, and the cross-section of the holding part of the handle 5 is oval; The limit block 801 is vertically connected to the vernier caliper 3, and a limit slot 7 is provided on the surface of the vernier caliper 3. The limit slot 7 and the limit buckle 802 cooperate with each other; The main scale body 2 is made of high-strength stainless steel and its surface is treated with rust prevention.

[0024] The main scale body 2 is replaced with a cylindrical, quadrangular prism and hexagonal prism shape, and the graduation value of the scale tables of the main scale body 2 and the vernier caliper 3 is between 0.02 - 0.05 millimeters.

[0025] The thread specification of the thread not-go gauge 1 matches that of the thread go gauge 6. Both of their thread profile angles are standard thread profile angles, and the thread length of the thread not-go gauge 1 does not exceed two pitches. When measuring a thread, the thread go gauge 6 is used to detect whether the actual size of the thread is within the specified tolerance range and can smoothly screw into the measured thread; while the thread not-go gauge 1 is used to detect whether the actual size of the thread exceeds the specified tolerance range. Under normal circumstances, the thread not-go gauge 1 should not screw into the measured thread. In this way, it can be judged whether the dimensional accuracy of the measured thread meets the requirements; Both the main scale body 2 and one side surface of the vernier caliper 3 are provided with scale tables. The scale unit is millimeter. The scale lines of the scale table of the vernier caliper 3 are arranged in parallel correspondence with the scale lines of the scale table of the main scale body 2, and the graduation value of the scale tables of the main scale body 2 and the vernier caliper 3 is between 0.02 - 0.05 millimeters. When measuring, the measured object is placed between the main scale body 2 and the vernier caliper 3. By observing the alignment of the scale tables of the main scale body 2 and the vernier caliper 3, the size of the object can be accurately measured. Mounting parts 9, rubber pads 10 and bolts: On the side of the vernier caliper 3 close to the main scale body 2, mounting parts 9 are provided. Rubber pads 10 are arranged between the mounting parts 9, and mounting holes 11 are symmetrically provided on the mounting parts 9. Bolts are installed on the mounting holes 11. The function of the rubber pad 10 is to increase the stability during measurement and prevent scratching the surface of the measured object. By fixing the mounting parts 9 with bolts, the relative position between the vernier caliper 3 and the main scale body 2 can be ensured to be stable, thereby improving the measurement accuracy; There are two sets of vernier calipers 3 symmetrically arranged. On one side of each set of vernier calipers 3, a limit block 801 is fixedly connected. A limit rod 803 is arranged on the limit block 801. A limit buckle 802 is movably connected to the limit rod 803. A rotating shaft 806 is movably connected to one side of the limit buckle 802. The limit buckle 802 is movably connected to a pressure rod 804 through the rotating shaft 806. A return spring 805 is arranged between the pressure rod 804 and the limit block 801. When it is necessary to fix the position of the vernier caliper 3, press the pressure rod 804. The pressure rod 804 drives the limit buckle 802 to rotate through the rotating shaft 806, so that the limit buckle 802 is clamped into the limit slot 7 opened on the surface of the vernier caliper 3, realizing the limit fixation of the vernier caliper 3. When it is necessary to move the vernier caliper 3, press the pressure rod 804 again. The limit buckle 802 is separated from the limit slot 7. Under the action of the return spring 805, the pressure rod 804 and the limit buckle 802 return to their original positions, and the vernier caliper 3 can move freely.

[0026] Embodiment 2

[0027] A measuring method of a thread depth measuring device includes the following steps: S1: Screw the thread through end 6 into the thread hole to be measured and rotate it to the bottom of the thread hole; S2: Push the vernier caliper 3 to slide along the chute of the main scale body 2 so that the limit block 801 at one end of the vernier caliper 3 is closely attached to the end face of the thread hole to be measured; S3: When the limit block 801 is tightly attached, the pressure rod 804 will drive the limit buckle 802 to cooperate with the limit slot 7 to stabilize the main scale body 2, and then tighten the fixing nut 4 to fix the position of the vernier caliper 3 on the main scale body 2; S4: Read the scale value on the left side of the scale line of the vernier caliper 3 on the scale table of the main scale body 2 as the integer part; S5: Then read the scale line value where the scale table of the vernier caliper 3 is aligned with the scale table of the main scale body 2, and multiply this value by the graduation value of the vernier caliper 3 to obtain the decimal part; S6: Add the integer part and the decimal part to obtain the depth measurement value of the thread hole to be measured; S7: Screw the thread not-go end 1 into the thread hole to be measured. If the screwing depth of the thread not-go end 1 does not exceed two pitches, it is determined that the accuracy meets the requirements.

[0028] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, in any regard, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Accordingly, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

[0029] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A thread depth measuring device, characterized in that, It includes a thread no-go gauge (1), a main scale body (2), a thread go gauge (6) and a limiting mechanism (8). The thread no-go gauge (1) and the thread go gauge (6) are respectively arranged at both ends of the main scale body (2). A handle (5) is arranged on one side of the main scale body (2) close to the thread no-go gauge (1). A vernier caliper (3) is movably connected to the main scale body (2). A fixing nut (4) is arranged on one side of the vernier caliper (3). The vernier caliper (3) is movably connected to the main scale body (2) through the fixing nut (4), and limiting mechanisms (8) are symmetrically arranged on the vernier caliper (3). The limiting mechanism (8) includes a limiting block (801), a limiting buckle (802), a limiting rod (803), a pressing rod (804), a return spring (805) and a rotating shaft (806). There are two groups of vernier calipers (3) arranged symmetrically. Limiting blocks (801) are fixedly connected to one side of each vernier caliper (3). A limiting rod (803) is arranged on the limiting block (801). A limiting buckle (802) is movably connected to the limiting rod (803). A rotating shaft (806) is movably connected to one side of the limiting buckle (802). The limiting buckle (802) is movably connected to a pressing rod (804) through the rotating shaft (806). A return spring (805) is arranged between the pressing rod (804) and the limiting block (801).

2. A thread depth measuring device according to claim 1, characterized in that, Mounting parts (9) are arranged on one side of each vernier caliper (3) close to the main scale body (2). A rubber pad (10) is arranged between the mounting parts (9). Mounting holes (11) are symmetrically opened on the mounting parts (9), and bolts are installed on the mounting holes (11).

3. A thread depth measuring device according to claim 2, characterized in that, Scale tables are opened on the surfaces of one side of the main scale body (2) and the vernier caliper (3). The scale unit of the scale table is millimeter, and the scale lines of the scale table of the vernier caliper (3) are arranged in parallel correspondence with the scale lines of the scale table of the main scale body (2).

4. A thread depth measuring device according to claim 3, wherein, The thread specification of the thread no-go gauge (1) matches that of the thread go gauge (6). The thread profile angles of the thread no-go gauge (1) and the thread go gauge (6) are both standard thread profile angles, and the thread length of the thread no-go gauge (1) does not exceed two pitches.

5. The thread depth measuring device according to claim 4, wherein Anti-slip patterns are arranged on the surface of the handle (5). The anti-slip patterns are staggered concave and convex stripes, and the cross-section of the holding part of the handle (5) is oval.

6. The thread depth measuring device according to claim 5, characterized in that, The limiting block (801) is vertically connected to the vernier caliper (3), and a limiting card slot (7) is opened on the surface of the vernier caliper (3). The limiting card slot (7) and the limiting buckle (802) cooperate with each other.

7. A thread depth measuring device according to claim 6, characterized in that, The main scale body (2) is made of stainless steel and its surface is treated with rust prevention.

8. A thread depth measuring device according to claim 7, characterized in that, The main scale body (2) is replaced with a cylindrical, quadrangular prism and hexagonal prism shape, and the graduation value of the scale tables of the main scale body (2) and the vernier caliper (3) is between 0.02 - 0.05 millimeters.

9. A measuring method based on the thread depth measuring device according to any one of claims 1-8, characterized in that, It includes the following steps: S1: Screw the thread go gauge (6) into the threaded hole to be measured and rotate it to the bottom of the threaded hole. S2: Push the vernier caliper (3) to slide along the chute of the main scale body (2) so that the limiting block (801) at one end of the vernier caliper (3) is closely attached to the end face of the threaded hole to be measured. S3: When the limit block (801) is in close contact, the pressure rod (804) will drive the limit buckle (802) to cooperate with the limit card slot (7) to stabilize the main scale body (2), and then tighten the fixing nut (4) to fix the position of the vernier caliper (3) on the main scale body (2); S4: Read the scale value on the left side of the scale line of the vernier caliper (3) on the scale table of the main scale body (2) as the integer part; S5: Then read the scale line value where the scale table of the vernier caliper (3) aligns with the scale table of the main scale body (2), and multiply this value by the graduation value of the vernier caliper (3) to obtain the decimal part; S6: Add the integer part and the decimal part to obtain the depth measurement value of the threaded hole to be measured; S7: Screw the thread no-go gauge (1) into the threaded hole to be measured. If the screwing depth of the thread no-go gauge (1) does not exceed two pitches, it is determined that the accuracy meets the requirements.

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