Inner hole conical surface angle detection device and use method

Abstract

The invention provides an inner hole conical surface angle detection device and a use method, the inner hole conical surface angle detection device comprises a fixed end and a movable end which slide relatively, a telescopic guide sleeve and a movable ejector pin are arranged between the fixed end and the movable end, the telescopic guide sleeve abuts against a fixed hole in the fixed end, and the movable ejector pin abuts against a fixed hole in the movable end. A spring is arranged in the telescopic guide sleeve, one end of the spring abuts against the movable ejector pin, and the other end of the spring abuts against the interior of the fixed end. And a detection rod is fixedly arranged at the other end of the fixed end and the movable end. The inner hole conical surface angle detection device not only provides reliable mechanical support, but also simplifies the operation and maintenance process, and ensures that each measurement can meet the expected precision requirement. The device is especially suitable for occasions requiring high-precision measurement, especially for application scenes having strict requirements on the conical surface angle of the inner hole of the workpiece in the manufacturing process.

Description

Technical Field

[0001] The invention relates to the field of measurement, and in particular to an inner hole cone angle detection device and a use method thereof. Background Art

[0002] In the production and quality control process of oil drill collars, the angle measurement of the inner hole cone is a critical and complex task. The traditional method is to use cement combined with a projector for measurement. Since the quality of cement molding is affected by operator factors and temperature, the error is large and it takes a long time (generally more than 0.5 hours). Alternatively, a self-made mandrel is used to select the detection surface corresponding to a fixed depth, and the intersection size of the mandrel and the cone is checked to complete the detection.

[0003] When using clay combined with a projector for measurement, in spring, autumn, and winter, the clay cannot solidify immediately due to the low ambient temperature. After the clay cools down, it needs to be sliced ​​and then placed on a projector for magnified testing to detect the specific angle size. Since the quality of clay molding is affected by the operator and temperature, the error is large and it takes a long time (generally more than 0.5 hours, including kneading clay - plugging clay - waiting for clay to cool down - cutting clay - projecting clay).

[0004] The use of a self-made mandrel requires the accuracy of the detection result of the starting point of the cone surface, because the detection result is an indirect measurement of the starting point depth, which is then converted and not directly detected, so there is a certain detection error; because the intersection of the mandrel and the cone surface is a sharp point, it is easy to wear and easily damage the product cone surface, which will directly affect the accuracy of the test result; a mandrel can only detect a straight hole cone surface feature with a fixed diameter, and cannot solve the compatibility problem; in order to increase the service life of the self-made mandrel, a more wear-resistant material (a certain type of steel) is usually selected, which will cause the mandrel to be heavy and inconvenient for operators and inspectors to use. Since the machining dimensions of different workpieces are different, the A value of each workpiece needs to be re-measured, and the measurement process is cumbersome and time-consuming. Summary of the invention

[0005] The main purpose of the present invention is to provide an inner hole cone angle detection device and a method of use to solve the problems in the above-mentioned background technology.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: comprising a fixed end and a movable end that slide relatively, a telescopic guide sleeve and a movable ejector are arranged between the fixed end and the movable end, the telescopic guide sleeve abuts against the fixed hole on the fixed end, the movable ejector abuts against the fixed hole on the movable end, a spring is arranged in the telescopic guide sleeve, one end of the spring abuts against the movable ejector, and the other end abuts against the fixed end; A handle is fixedly arranged at one end of the fixed end and the movable end, and a detection rod is fixedly arranged at the other end.

[0007] Preferably, sleeves are provided on both sides of the telescopic guide sleeve, and the movable ejector pin slides against the sleeves.

[0008] Preferably, one side of the fixed end is fixedly connected to the telescopic guide sleeve via a first top screw; One side of the movable end is fixedly connected with the movable ejector pin through a second ejector screw.

[0009] Preferably, threaded sleeves are fixedly provided at both ends of the fixed end and the movable end, and the handle and the end of the detection rod are threadedly connected to the threaded sleeves.

[0010] Preferably, the detection rods are provided in two sets of two pieces in each size, and the ends of the two sets of detection rods installed at the fixed end and the movable end have the same protruding length.

[0011] Preferably, the end of the detection rod is hemispherical, and the end of the detection rod abuts against the conical surface of the workpiece.

[0012] Preferably, positioning arc surfaces are provided on the outer sides of the fixed end and the movable end, and the fixed end and the movable end are pressed against the inner wall of the workpiece through the positioning arc surfaces, and automatic centering is achieved through spring pushing.

[0013] A method for using an inner hole cone angle detection device, the method steps are as follows: S1. Select the appropriate length of the movable ejector and telescopic guide sleeve according to the inner hole diameter of the workpiece; S2. According to the cone angle a° inside the workpiece, select two sets of detection rods R of appropriate size. 大 and R 小 , the length of the extended part of the detection rod is L, and the length is consistent; S3, put the detection rod R 小 Assemble with the detection device and check whether the length L is consistent; S4. Hold the handle to compress the detection device to a size slightly smaller than the inner hole diameter and send it to the designated position. Before reaching the designated position, remove the radial force on the detection device so that the detection device automatically adheres to the inner wall of the inner hole under the action of the spring. Then gently push the detection device to the designated axial position to ensure that the two detection rods R 小 All are in contact with the cone surface; S5. Use the depth gauge to measure the length of the workpiece end face from the fixed end and the movable end, and record it as A. 小 ; S6. Take out the detection device and disassemble the detection rod R 小 , the detection rod R 大 Assemble with the detection device and check whether the length L is consistent; S7, repeat steps S4 and S5 to ensure that the two detection rods R 大 Both are in contact with the cone surface and measure A 大 ; S8, the workpiece inner cone angle a°, the allowable tolerance is ±c°, obtained by calculation: (A 小 -A 大 ) Value range: (A 小 -A 大 ) 最大 =(R 大 -R 小 )×[1-sin(a°-c°)] (A 小 -A 大 ) 最小 =(R 大 -R 小 )) ×[1-sin(a°+c°)] (A 大 ) 最大 =A 小 - (R 大 -R 小 )) ×[1-sin(a°-c°)] (A 大 ) 最小 =A 小 -R 大 -R 小 )) ×[1-sin(a°+c°)] When A 大 The actual measured value meets (A 大 ) 最小 大 <(A 大 ) 最大 When , it can be determined that the cone angle a° is within the qualified tolerance range, otherwise, the cone angle a° is unqualified.

[0014] Preferably, in step S1, it is ensured that the movable end and the fixed end can enter the inner hole of the workpiece after compressing the spring, and the movable end and the fixed end can be fixed against the inner wall of the inner hole after being pushed by the spring.

[0015] The present invention provides an inner hole cone angle detection device and a method for using the same, with the following beneficial effects: 1. Directly measure the two detection points on the cone surface without indirect measurement, which reduces the conversion error and ensures the accuracy of the test results.

[0016] 2. By replacing parts, it can cover the measurement of most cone angles.

[0017] 3. The contact part between the detection rod and the workpiece adopts a spherical design, which effectively prevents the surface of the measured cone from being scratched by the inspection tool and increases the service life of the inspection tool.

[0018] ​4. To achieve the function of compatible multi-angle rapid detection, you can first select a fixed detection rod length and the size of the spherical surface of the detection rod end surface, and make the detection parameters into a table, so that the operator can operate simply and quickly, reducing the operator's calculations. You can directly know whether the measurement result is qualified or not by looking up the table.

[0019] 5. The detection device is lighter and can be easily picked up by operators and inspectors, making it simple and convenient to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Figure 1 It is an axial side view of the overall structure of the present invention; Figure 2 It is an exploded view of the overall structure of the present invention; Figure 3 is a measurement schematic diagram of step S5 of the present invention; Figure 4 is a measurement schematic diagram of step S7 of the present invention; Figure 5 It is a schematic diagram of the relative detection positions of two sets of detection rods of the present invention; In the figure: fixed end 1; telescopic guide sleeve 2; movable ejector pin 3; movable end 4; handle 5; detection rod 6; spring 7; first ejector screw 8; second ejector screw 9. DETAILED DESCRIPTION

[0021] Example 1 like Figures 1 to 5 As shown, an inner hole cone angle detection device comprises a fixed end 1 and a movable end 4 which slide relatively, a telescopic guide sleeve 2 and a movable ejector pin 3 are arranged between the fixed end 1 and the movable end 4, the telescopic guide sleeve 2 abuts against the fixed hole on the fixed end 1, the movable ejector pin 3 abuts against the fixed hole on the movable end 4, a spring 7 is arranged in the telescopic guide sleeve 2, one end of the spring 7 abuts against the movable ejector pin 3, and the other end abuts against the fixed end 1; A handle 5 is fixedly disposed at one end of the fixed end 1 and the movable end 4, and a detection rod 6 is fixedly disposed at the other end.

[0022] The fixed end 1 and the movable end 4 of the detection device can enter the inner hole of the workpiece through the compression spring 7, and the outer sides of the fixed end 1 and the movable end 4 abut against the inner wall of the workpiece, and the detection device can be arranged in the same radial direction in the inner hole through the action of the spring 7. The detection rod 6 abuts against the cone surface of the workpiece, and the cone surface angle of the workpiece can be obtained by calculation.

[0023] The detection device is composed of a fixed end 1, a telescopic guide sleeve 2, a movable ejector pin 3, a movable end 4, a handle 5, a detection rod 6 and a spring 7. The telescopic guide sleeve 2 and the spring 7 ensure that the movable end 4 can move relative to the fixed end 1 within a certain range.

[0024] When in use, the user holds the handle 5 and inserts the detection device into the inner hole of the workpiece to be tested. Due to the presence of the compression spring 7, the fixed end 1 and the movable end 4 can be contracted, so that the device can smoothly enter the inner hole of the workpiece. When the device completely enters the inner hole, the spring 7 will push the movable end 4 so that its outer side contacts the inner wall of the workpiece, ensuring the correct radial position of the device in the inner hole.

[0025] The detection rod 6 is located at one end of the device and is designed to contact the conical surface of the workpiece. When the device is properly positioned, the detection rod 6 will be close to the conical surface. At this time, by reading the position change of the detection rod 6 and combining it with a certain calculation method, it can be determined whether the angle of the conical surface of the inner hole of the workpiece meets the requirements.

[0026] Preferably, sleeves are provided on both sides of the telescopic guide sleeve 2, and the movable ejector pin 3 slides against the sleeves.

[0027] The relative sliding between the fixed end 1 and the movable end 4 is achieved through the telescopic guide sleeve 2. The telescopic guide sleeve 2 is equipped with sleeves on both sides, which not only provides a sliding path for the movable ejector 3, but also ensures the accuracy of its linear motion, thereby improving the reliability of the measurement results.

[0028] Preferably, one side of the fixed end 1 is fixedly connected to the telescopic guide sleeve 2 via a first top screw 8; One side of the movable end 4 is fixedly connected to the movable ejector pin 3 via a second ejector screw 9 .

[0029] The fixed end 1 and the telescopic guide sleeve 2 are fixedly connected by the first top screw 8. This allows the telescopic guide sleeve 2 to be firmly mounted on the fixed end 1, which facilitates the disassembly and assembly of the telescopic guide sleeve 2. The movable end 4 and the movable ejector pin 3 are fixedly connected by the second top screw 9. This ensures that the movable ejector pin 3 can slide in the sleeve while maintaining a tight connection with the movable end 4, which facilitates its replacement.

[0030] Preferably, threaded sleeves are fixed at both ends of the fixed end 1 and the movable end 4, and the ends of the handle 5 and the detection rod 6 are threadedly connected to the threaded sleeves. The fixed end 1 and the movable end 4 have the same length, ensuring that the detection rod 6 is installed on the fixed end 1 and the movable end 4 The extended length is the same.

[0031] The fixed end 1 and the movable end 4 are provided with threaded sleeves, and the handle 5 and the detection rod 6 are connected to these sleeves by threads. The threaded connection provides good mechanical strength and tightness, and is also convenient for disassembly and replacement of parts. The fixed end 1 and the movable end 4 are of the same length, and their extended lengths are the same. This is essential for maintaining the consistency and accuracy of the measurement, especially when it is necessary to compare the measurement results at different positions.

[0032] Preferably, the detection rods 6 are two sets of two large and two small detection rods 6, and the two sets of large and small detection rods 6 are installed at the fixed end 1 and the movable end 4 with the same extension length. By replacing the two sets of large and small detection rods 6, the cone surface of the workpiece is repeatedly measured, and the precise angle of the cone surface can be obtained by calculation.

[0033] Preferably, the end of the detection rod 6 is hemispherical, and the end of the detection rod 6 is against the conical surface of the workpiece. The fixed end 1 and the movable end 4 are provided with positioning arc surfaces on the outside, and the fixed end 1 and the movable end 4 are against the inner wall of the workpiece through the positioning arc surfaces, and the spring 7 pushes to achieve automatic centering.

[0034] The end of the detection rod is designed to be hemispherical, which helps to provide a stable contact point during measurement and can adapt to small-scale unevenness or slight changes on the cone surface of the workpiece. The hemispherical design can also ensure single-point contact between the detection rod and the cone surface, thereby improving measurement accuracy. Positioning arc surfaces are provided on the outside of the fixed end 1 and the movable end 4, which are designed to fit closely to the inner wall of the workpiece. Through the pushing action of the spring 7, the positioning arc surface can automatically adjust its position to ensure that the device remains centered in the inner hole of the workpiece, improving the consistency and accuracy of the measurement.

[0035] Example 2 like Figures 1 to 3 As shown, in combination with Example 1, a method for using an inner hole cone angle detection device is further described, and the method steps are as follows: S1, select the movable ejector 3 and the telescopic guide sleeve 2 of appropriate length according to the inner hole diameter of the workpiece; S2. According to the cone angle a° inside the workpiece, select two sets of detection rods 6R of appropriate size. 大 and R 小 , the length of the extended part of the detection rod 6 is L, and the length is consistent; S3, put the detection stick 6R 小 Assemble with the detection device and check whether the length L is consistent; S4, hold the handle 5 to compress the detection device to a size slightly smaller than the inner hole diameter, and send it to the designated position. Before reaching the designated position, remove the radial force on the detection device, so that the detection device automatically adheres to the inner wall of the inner hole under the action of the spring 7, and then gently push the detection device to the designated axial position to ensure that the two detection rods 6R 小 All are in contact with the cone surface; S5. Use the depth gauge to measure the length of the workpiece end face from the fixed end 1 and the movable end 4, and record it as A. 小 ; S6. Take out the detection device and disassemble the detection rod 6R 小 , put the detection rod 6R 大 Assemble with the detection device and check whether the length L is consistent; S7, repeat steps S4 and S5 to ensure that the two detection rods 6R大 Both are in contact with the cone surface and measure A 大 ; S8, the workpiece inner cone angle a°, the allowable tolerance is ±c°, obtained by calculation: (A 小 -A 大 ) Value range: (A 小 -A 大 ) 最大 =(R 大 -R 小 )×[1-sin(a°-c°)] (A 小 -A 大 ) 最小 =(R 大 -R 小 )) ×[1-sin(a°+c°)] (A 大 ) 最大 =A 小 - (R 大 -R 小 )) ×[1-sin(a°-c°)] (A 大 ) 最小 =A 小 -R 大 -R 小 )) ×[1-sin(a°+c°)] When A 大 The actual measured value meets (A 大 ) 最小 大 <(A 大 ) 最大 When , it can be determined that the cone angle a° is within the qualified tolerance range, otherwise, the cone angle a° is unqualified.

[0036] Preferably, in step S1, it is ensured that the movable end 4 and the fixed end 1 can enter the inner hole of the workpiece after compressing the spring 7, and after the spring 7 pushes, the movable end 4 and the fixed end 1 can be fixed against the inner wall of the inner hole.

[0037] By selecting different sizes of detection rods for two measurements and using trigonometric calculations, the measurement accuracy is improved. The design of the positioning arc surface and spring enables the device to automatically adjust to the best measurement position to adapt to the inner holes of workpieces of different sizes. The consistency of the extended length of the detection rod ensures the uniformity of the measurement conditions and reduces the source of error. Through repeated measurements and data analysis, the reliability and accuracy of the measurement results are improved.

[0038] ​The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A device for detecting the angle of an inner hole cone, characterized in that: A fixed end (1) and a movable end (4) are relatively slidable, a telescopic guide sleeve (2) and a movable ejector pin (3) are provided between the fixed end (1) and the movable end (4), the telescopic guide sleeve (2) abuts against a fixed hole on the fixed end (1), the movable ejector pin (3) abuts against a fixed hole on the movable end (4), a spring (7) is provided in the telescopic guide sleeve (2), one end of the spring (7) abuts against the movable ejector pin (3), and the other end abuts against the fixed end (1); A handle (5) is fixedly provided at one end of the fixed end (1) and the movable end (4), and a detection rod (6) is fixedly provided at the other end.

2. According to claim 1, a device for detecting the angle of inner hole cone, characterized in that: Sleeves are provided on both sides of the telescopic guide sleeve (2), and the movable ejector pin (3) slides against the sleeves.

3. The inner hole cone angle detection device according to claim 1, characterized in that: One side of the fixed end (1) is fixedly connected to the telescopic guide sleeve (2) via a first top screw (8); One side of the movable end (4) is fixedly connected to the movable ejector pin (3) via a second ejector screw (9).

4. The inner hole cone angle detection device according to claim 1, characterized in that: Threaded sleeves are fixedly provided at both ends of the fixed end (1) and the movable end (4), and the ends of the handle (5) and the detection rod (6) are threadedly connected to the threaded sleeves.

5. The inner hole cone angle detection device according to claim 1, characterized in that: The detection rods (6) are provided in two sets, each having two pieces of a larger size. The ends of the two sets of detection rods (6) installed at the fixed end (1) and the movable end (4) have the same protruding length.

6. The inner hole cone angle detection device according to any one of claims 1 and 5, characterized in that: The end of the detection rod (6) is hemispherical, and the end of the detection rod (6) abuts against the conical surface of the workpiece.

7. The inner hole cone angle detection device according to any one of claims 1, 3 and 4, characterized in that: Positioning arc surfaces are provided on the outside of the fixed end (1) and the movable end (4); the fixed end (1) and the movable end (4) are pressed against the inner wall of the workpiece through the positioning arc surfaces, and are automatically aligned by being pushed by a spring (7).

8. A method for using the inner hole cone angle detection device according to any one of claims 1 to 7, wherein the method steps are as follows: S1, selecting a movable ejector pin (3) and a telescopic guide sleeve (2) of appropriate length according to the inner hole diameter of the workpiece; S2. According to the cone angle a° inside the workpiece, select two sets of testing rods (6) R of appropriate size. 大 and R 小 , the extended portion of the detection rod (6) is of the same length, L; S3. Put the detection rod (6) R 小 Assemble with the detection device and check whether the length L is consistent; S4. Use the handle (5) to compress the detection device to a size slightly smaller than the inner hole diameter and insert it into the designated position. Before reaching the designated position, remove the radial force on the detection device so that the detection device automatically adheres to the inner wall of the inner hole under the action of the spring (7). Then gently push the detection device to the designated axial position to ensure that the two detection rods (6) R 小 All are in contact with the cone surface; S5. Use a depth gauge to measure the distance between the end face of the workpiece and the ends of the fixed end (1) and the movable end (4), and record it as A. 小 ; S6. Take out the detection device and disassemble the detection rod (6) R 小 , put the detection rod (6) R 大 Assemble with the detection device and check whether the length L is consistent; S7, repeat steps S4 and S5 to ensure that the two detection rods (6) R 大 Both are in contact with the cone surface, and A is measured 大 ; S8, the inner cone angle of the workpiece is a°, and the allowable tolerance is ±c°, which is obtained by calculation: ( A 小 -A 大 ) Value range: (A 小 -A 大 ) 最大 =(R 大 -R 小 )×[1-sin(a°-c°)] (A 小 -A 大 ) 最小 =(R 大 -R 小 )) ×[1-sin(a°+c°)] (A 大 ) 最大 =A 小 - (R 大 -R 小 )) ×[1-sin(a°-c°)] (A 大 ) 最小 =A 小 - R 大 -R 小 )) ×[1-sin(a°+c°)] When A 大 The actual measured value meets (A 大 ) 最小 < A 大 <(A 大 ) 最大 When , it can be determined that the cone angle a° is within the qualified tolerance range, otherwise, the cone angle a° is unqualified.

9. The method for using the inner hole cone angle detection device according to claim 8, characterized in that: In step S1, it is ensured that the movable end (4) and the fixed end (1) can enter the inner hole of the workpiece after compressing the spring (7), and after the spring (7) pushes, the movable end (4) and the fixed end (1) can be fixed against the inner wall of the inner hole.

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