A casing thread measuring device

Abstract

The utility model relates to an oil casing thread measuring device belongs to the oil casing technical field, including the measuring tool main part, one end of measuring tool main part is equipped with the dial gauge, the dial gauge has the dial and the probe connecting rod, the lower extreme of probe connecting rod has the measurement contact, be equipped with the sliding groove in measuring tool main part, probe connecting rod and sliding groove sliding connection, the lower extreme of measuring tool main part is equipped with two mounting grooves in proper order, is equipped with the support leg in mounting groove, the utility model can accurately measure the thread change value, and be applicable to the trapezoidal thread of multiple pitch.

Description

Technical Field

[0001] This utility model relates to the field of oil casing technology, and in particular to an oil casing thread measuring device. Background Technology

[0002] Currently, some oil casing internal thread joints need to be screwed to a certain position during mating, such as... Figure 1 As shown, this requires that the internal thread tail pull must not be retracted. If the tool is retracted prematurely at the thread tail during internal thread machining, it will cause interference between the internal and external threads, resulting in "sticking" during threading. At the thread tail of the internal thread connector, the thread is not a fully apical thread and cannot be measured by measuring the thread profile height; existing API standard thread tail gauges can only measure external threads and are only applicable to 5 threads / inch trapezoidal threads. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the above-mentioned traditional technology and provide an oil casing thread measuring device that can accurately measure the thread change value and is applicable to trapezoidal threads with various pitches.

[0004] The purpose of this utility model is achieved through the following technical measures: a measuring device for measuring the thread of an oil casing pipe, including a measuring instrument body, a dial indicator at one end of the measuring instrument body, the dial indicator having a dial and a probe connecting rod, a measuring contact at the lower end of the probe connecting rod, a sliding groove inside the measuring instrument body, the probe connecting rod being slidably connected to the sliding groove, and two mounting grooves in sequence at the lower end of the measuring instrument body, with support legs inside the mounting grooves.

[0005] As a further improvement to the above technical solution: The probe connecting rod has a square cross-section, and the measuring contact is threadedly connected to the probe connecting rod.

[0006] The measuring instrument body has a notch at one end, the dial of the dial indicator is set above the measuring instrument body, the probe connecting rod passes through one end of the measuring instrument body to the notch, and the measuring contact extends beyond the lower end of the measuring instrument body.

[0007] The length of the sliding stroke S of the probe connecting rod in the sliding groove is designed to be ≥5.0mm.

[0008] The probe connecting rod is fixed inside the measuring instrument body by the first fastening bolt.

[0009] The end of the support leg has a rounded corner with a radius R of 0.3~0.7mm.

[0010] The width n of the support leg is 1.0~4.0mm.

[0011] The height h of the supporting leg is 1.2~3.0mm.

[0012] The distance L between the two supporting legs is 25.4 mm.

[0013] The support leg is fixedly connected to the bottom of the mounting groove by a second fastening bolt.

[0014] Due to the adoption of the above technical solution, the advantages of this utility model compared with the prior art are: 1. It can accurately measure the thread tail of internal threads, and guide the thread tail finishing process in the production of internal threads; 2. By setting the measuring contact, support leg, and sliding groove, the corresponding specifications of the measuring contact and support leg are selected according to different types of threads, and the position of the measuring head connecting rod in the sliding groove is adjusted, thereby realizing the measurement of multiple pitches and multiple specifications of thread tails.

[0015] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the oil casing internal thread in the background technology when it is screwed to a certain position; Figure 2 This is a schematic diagram of the structure of an oil casing pipe thread measuring device according to an embodiment of this utility model; Figure 3 yes Figure 2 The left view; Figure 4 yes Figure 2 The right view; Figure 5 This is a schematic diagram of the structure of the oil sleeve pipe thread measuring device of this utility model during measurement; Figure 6 yes Figure 5 A magnified view of part A in the middle.

[0017] In the figure, 1-gauge body, 2-dial indicator, 3-measuring contact, 4-support leg, 5-sliding groove, 6-probe connecting rod, 7-first fastening bolt, 8-second fastening bolt, 9-mounting groove, 10-oil sleeve to be tested, 11-notch, 12-dial. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. Example 1

[0021] like Figure 2-4 As shown, an oil casing thread measuring device includes a measuring tool body 1, which is a rectangular plate and is made of high-hardness, high-wear-resistant alloy tool steel.

[0022] One end of the measuring instrument body 1 is equipped with a dial indicator 2. The dial indicator 2 has a dial 12 and a probe connecting rod 6. The probe connecting rod 6 has a square cross-section. The lower end of the probe connecting rod 6 has a measuring contact 3. The measuring contact 3 is threadedly connected to the probe connecting rod 6. Different specifications of measuring contacts can be replaced according to the thread profile.

[0023] A notch 11 is provided at the lower end of one end of the measuring instrument body 1. The dial 12 of the dial indicator 2 is positioned above the measuring instrument body 1. The probe connecting rod 6 passes through one end of the measuring instrument body 1 to the notch 11. The measuring contact 3 extends beyond the lower end of the measuring instrument body 1. A sliding groove 5 is provided inside the measuring instrument body 1. The probe connecting rod 6 is slidably connected to the sliding groove 5, allowing it to move left and right within the sliding groove 5 to accommodate different thread profiles. The sliding stroke S of the probe connecting rod 6 within the sliding groove 5 is designed to be ≥5.0 mm. When the probe connecting rod 6 slides to the appropriate position, it is fixed inside the measuring instrument body 1 by the first fastening bolt 7.

[0024] The lower end of the measuring instrument body 1 is provided with two mounting slots 9 in sequence. The mounting slots 9 are provided with support legs 4. The support legs 4 are fixedly connected to the bottom of the mounting slots 9 by the second fastening bolts 8. The distance L between the two support legs 4 is 25.4mm. This length is suitable for commonly used 8-thread / 25.4mm, 6-thread / 25.4mm, 5-thread / 25.4mm, 4-thread / 25.4mm, 3-thread / 25.4mm standard and special threads.

[0025] The end of the support leg 4 has a rounded corner with a radius R of 0.3mm. This rounded corner ensures that the support leg 4 can slide smoothly within the tooth socket. The width n of the support leg 4 is 1.0mm, and the height h of the support leg 4 is 1.2mm. Different specifications of support legs 4 are designed according to different tooth shapes, and they can be directly replaced during use. Example 2

[0026] like Figure 2-4 As shown, an oil casing thread measuring device includes a measuring tool body 1, which is a rectangular plate and is made of high-hardness, high-wear-resistant alloy tool steel.

[0027] One end of the measuring instrument body 1 is equipped with a dial indicator 2. The dial indicator 2 has a dial 12 and a probe connecting rod 6. The probe connecting rod 6 has a square cross-section. The lower end of the probe connecting rod 6 has a measuring contact 3. The measuring contact 3 is threadedly connected to the probe connecting rod 6. Different specifications of measuring contacts can be replaced according to the thread profile.

[0028] A notch 11 is provided at the lower end of one end of the measuring instrument body 1. The dial 12 of the dial indicator 2 is positioned above the measuring instrument body 1. The probe connecting rod 6 passes through one end of the measuring instrument body 1 to the notch 11. The measuring contact 3 extends beyond the lower end of the measuring instrument body 1. A sliding groove 5 is provided inside the measuring instrument body 1. The probe connecting rod 6 is slidably connected to the sliding groove 5, allowing it to move left and right within the sliding groove 5 to accommodate different thread profiles. The sliding stroke S of the probe connecting rod 6 within the sliding groove 5 is designed to be ≥5.0 mm. When the probe connecting rod 6 slides to the appropriate position, it is fixed inside the measuring instrument body 1 by the first fastening bolt 7.

[0029] The lower end of the measuring instrument body 1 is provided with two mounting slots 9 in sequence. The mounting slots 9 are provided with support legs 4. The support legs 4 are fixedly connected to the bottom of the mounting slots 9 by the second fastening bolts 8. The distance L between the two support legs 4 is 25.4mm. This length is suitable for commonly used 8-thread / 25.4mm, 6-thread / 25.4mm, 5-thread / 25.4mm, 4-thread / 25.4mm, 3-thread / 25.4mm standard and special threads.

[0030] The end of support leg 4 has a rounded corner with a radius R of 0.7mm. This rounded corner ensures that support leg 4 can slide smoothly within the tooth socket. The width n of support leg 4 is 4.0mm, and the height h of support leg 4 is 3.0mm. Different specifications of support leg 4 are designed according to different tooth shapes, and they can be directly replaced during use. Example 3

[0031] like Figure 2-4 As shown, an oil casing thread measuring device includes a measuring tool body 1, which is a rectangular plate and is made of high-hardness, high-wear-resistant alloy tool steel.

[0032] One end of the measuring instrument body 1 is equipped with a dial indicator 2. The dial indicator 2 has a dial 12 and a probe connecting rod 6. The probe connecting rod 6 has a square cross-section. The lower end of the probe connecting rod 6 has a measuring contact 3. The measuring contact 3 is threadedly connected to the probe connecting rod 6. Different specifications of measuring contacts can be replaced according to the thread profile.

[0033] A notch 11 is provided at the lower end of one end of the measuring instrument body 1. The dial 12 of the dial indicator 2 is positioned above the measuring instrument body 1. The probe connecting rod 6 passes through one end of the measuring instrument body 1 to the notch 11. The measuring contact 3 extends beyond the lower end of the measuring instrument body 1. A sliding groove 5 is provided inside the measuring instrument body 1. The probe connecting rod 6 is slidably connected to the sliding groove 5, allowing it to move left and right within the sliding groove 5 to accommodate different thread profiles. The sliding stroke S of the probe connecting rod 6 within the sliding groove 5 is designed to be ≥5.0 mm. When the probe connecting rod 6 slides to the appropriate position, it is fixed inside the measuring instrument body 1 by the first fastening bolt 7.

[0034] The lower end of the measuring instrument body 1 is provided with two mounting slots 9 in sequence. The mounting slots 9 are provided with support legs 4. The support legs 4 are fixedly connected to the bottom of the mounting slots 9 by the second fastening bolts 8. The distance L between the two support legs 4 is 25.4mm. This length is suitable for commonly used 8-thread / 25.4mm, 6-thread / 25.4mm, 5-thread / 25.4mm, 4-thread / 25.4mm, 3-thread / 25.4mm standard and special threads.

[0035] The end of the support leg 4 has a rounded corner with a radius R of 0.5mm. This rounded corner ensures that the support leg 4 can slide smoothly within the tooth socket. The width n of the support leg 4 is 2.5mm, and the height h of the support leg 4 is 1.8mm. Different specifications of support legs 4 are designed according to different tooth shapes, and they can be directly replaced during use.

[0036] like Figure 5-6As shown, in the measurement of an oil casing thread measuring device, firstly, the two support legs are placed in the tooth groove, and the measuring contact 3 is placed in the tooth groove before the end of the thread of the oil casing 10 to be measured. Then, the measuring instrument is rotated clockwise along the tooth groove until the thread is unscrewed. If the thread end retraction is normal, the pointer of the dial indicator 2 will swing within the specified small deviation, indicating that the thread end meets the requirements. If it exceeds the specified deviation, it indicates that the thread end retraction is abnormal and the thread end does not meet the requirements.

[0037] 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. A device for measuring the thread of an oil casing pipe, characterized in that: The measuring instrument includes a main body (1), a dial indicator (2) at one end of the main body (1), the dial indicator (2) has a dial (12) and a probe connecting rod (6), the lower end of the probe connecting rod (6) has a measuring contact (3), the main body (1) has a sliding groove (5), the probe connecting rod (6) is slidably connected to the sliding groove (5), and the lower end of the main body (1) has two mounting grooves (9) in sequence, and the mounting grooves (9) have support legs (4).

2. The oil casing thread measuring device according to claim 1, characterized in that: The probe connecting rod (6) has a square cross-section, and the measuring contact (3) is threadedly connected to the probe connecting rod (6).

3. The oil casing thread measuring device according to claim 2, characterized in that: The measuring instrument body (1) has a notch (11) at one end, the dial (12) of the dial indicator (2) is set above the measuring instrument body (1), the probe connecting rod (6) passes through one end of the measuring instrument body (1) to the notch (11), and the measuring contact (3) extends beyond the lower end of the measuring instrument body (1).

4. The oil casing thread measuring device according to claim 3, characterized in that: The length of the sliding stroke S of the probe connecting rod (6) in the sliding groove (5) is designed to be ≥5.0mm.

5. The oil casing thread measuring device according to claim 4, characterized in that: The probe connecting rod (6) is fixed inside the measuring instrument body (1) by the first fastening bolt (7).

6. A pipe thread measuring device according to any one of claims 1-5, characterized in that: The end of the support leg (4) has a rounded corner with a radius R of 0.3~0.7mm.

7. The oil casing thread measuring device according to claim 6, characterized in that: The width n of the support leg (4) is 1.0~4.0mm.

8. The oil casing thread measuring device according to claim 7, characterized in that: The height h of the supporting leg (4) is 1.2~3.0mm.

9. The oil casing thread measuring device according to claim 8, characterized in that: The distance L between the two supporting legs (4) is 25.4 mm.

10. The oil casing thread measuring device according to claim 9, characterized in that: The support leg (4) is fixedly connected to the bottom of the mounting groove (9) by the second fastening bolt (8).

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