Inner hole conical surface angle detection device

Abstract

The utility model provides an inner hole conical surface angle detection device which 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, the movable ejector pin abuts against a fixed hole in the movable end, a spring is arranged in the telescopic guide sleeve, and the movable ejector pin abuts against the fixed hole in the movable end. 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 utility model relates to the field of measurement, in particular to a device for detecting the angle of an inner hole cone surface. Background Art

[0002] Measuring the angle of the inner bore taper is a critical and complex task in the production and quality control of oil drill collars. Traditionally, this method uses cement and a projector. Because the quality of cement formation is affected by operator input and temperature, errors are significant and the process is time-consuming (typically over 0.5 hours). Alternatively, a custom mandrel can be used to inspect the intersection of the mandrel and the taper, selecting a test surface at a fixed depth.

[0003] When measuring with clay and a projector, in spring, autumn, and winter, the clay cannot solidify immediately due to the low ambient temperature. After the clay cools, it needs to be sliced ​​and then placed on a projector for magnified inspection to detect the specific angle dimensions. Because the quality of clay molding is affected by the operator and temperature, errors are large and the process is time-consuming (usually more than 0.5 hours, including kneading the clay - plugging the clay - waiting for the clay to cool - cutting the clay - and projecting the clay).

[0004] Using a custom mandrel requires ensuring the accuracy of the test results at the starting point of the cone. This is because the test results are indirectly measured by converting the starting depth, not directly, which leads to a certain degree of detection error. The intersection of the mandrel and the cone is a sharp point, which is prone to wear and damage to the product cone, directly affecting the accuracy of the test results. A single mandrel can only detect the cone surface feature of a fixed diameter straight hole, which does not address compatibility issues. To increase the service life of custom mandrels, more wear-resistant materials (such as certain types of steel) are often selected, which makes the mandrel heavy and inconvenient for operators and inspectors. Because the machining dimensions of different workpieces vary, the A value of each workpiece needs to be remeasured, which is a tedious and time-consuming measurement process. Utility Model Content

[0005] The main purpose of the present invention is to provide a device for detecting the angle of an inner hole cone surface, so as 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 utility model is as follows: comprising a fixed end and a movable end that slide relatively, a telescopic guide sleeve and a movable ejector pin are provided between the fixed end and the movable end, the telescopic guide sleeve abuts against the fixed hole on the fixed end, the movable ejector pin abuts against the fixed hole on the movable end, a spring is provided in the telescopic guide sleeve, one end of the spring abuts against the movable ejector pin, and the other end abuts against the fixed end;

[0007] One end of the fixed end and the movable end is fixed with a handle, and the other end is fixed with a detection rod.

[0008] Preferably, sleeves are provided on both sides of the telescopic guide sleeve, and the movable ejector pin slides against the sleeves.

[0009] Preferably, one side of the fixed end is fixedly connected to the telescopic guide sleeve via a first top screw;

[0010] One side of the movable end is fixedly connected to the movable ejector pin through a second ejector screw.

[0011] Preferably, threaded sleeves are fixed 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.

[0012] Preferably, the detection rods are provided in two sets, two 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.

[0013] Preferably, the end of the detection rod is hemispherical, and the end of the detection rod rests on the conical surface of the workpiece.

[0014] 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 by spring pushing.

[0015] The utility model provides a device for detecting the angle of an inner hole cone, which has the following beneficial effects:

[0016] 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.

[0017] 2. By replacing parts, it can cover the measurement of most cone angles.

[0018] 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.

[0019] 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 face, and make the detection parameters into a table. This makes the operation simple and fast for the operator, reducing the operator's calculation. The operator can directly check whether the measurement result is qualified or not by looking up the table.

[0020] 5. The detection device is lighter and can be easily picked up by both operators and inspectors, making it simple and convenient to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0022] Figure 1 This is an axial side view of the overall structure of the utility model;

[0023] Figure 2 This is an exploded view of the overall structure of the utility model;

[0024] Figure 3 This is a schematic diagram of measurement in step S5 of the present invention;

[0025] Figure 4 This is a measurement diagram of step S7 of the present utility model;

[0026] Figure 5 This is a schematic diagram of the relative detection positions of two sets of detection rods in the utility model;

[0027] 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

[0028] Example 1

[0029] like Figures 1 to 5 As shown, a device for detecting the angle of an inner hole cone surface includes a fixed end 1 and a movable end 4 that slide relative to each other. 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 the fixed hole on the fixed end 1, and the movable ejector pin 3 abuts against the fixed hole on the movable end 4. A spring 7 is provided in the telescopic guide sleeve 2, with one end of the spring 7 abutting against the movable ejector pin 3 and the other end abutting against the fixed end 1.

[0030] 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.

[0031] The fixed end 1 and movable end 4 of the detection device are able to enter the inner hole of the workpiece through the compression spring 7. The outer sides of the fixed end 1 and movable end 4 abut against the inner wall of the workpiece, and the spring 7 can be used to ensure that the detection device is arranged in the same radial direction within the inner hole. The detection rod 6 abuts against the conical surface of the workpiece, and the angle of the workpiece conical surface is calculated to determine whether it is qualified.

[0032] The detection device consists 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.

[0033] During use, the user grasps handle 5 and inserts the detection device into the inner hole of the workpiece to be tested. The presence of compression spring 7 allows the fixed end 1 and movable end 4 to retract, allowing the device to smoothly enter the workpiece's inner hole. Once the device is fully inserted into the inner hole, spring 7 pushes the movable end 4, bringing its outer side into contact with the inner wall of the workpiece, ensuring the device's correct radial position within the inner hole.

[0034] A detection rod 6, located at one end of the device, is designed to contact the workpiece's tapered surface. When the device is properly positioned, the rod 6 rests against the tapered surface. By reading the rod's position and combining it with a specific calculation method, it can be determined whether the angle of the workpiece's inner hole taper meets the requirements.

[0035] Preferably, sleeves are provided on both sides of the telescopic guide sleeve 2, and the movable ejector pin 3 slides against the sleeves.

[0036] The relative sliding between the fixed end 1 and the movable end 4 is achieved by the telescopic guide sleeve 2. The sleeves on both sides of the telescopic guide sleeve 2 not only provide a sliding path for the movable ejector 3 but also ensure the accuracy of its linear motion, thereby improving the reliability of the measurement results.

[0037] Preferably, one side of the fixed end 1 is fixedly connected to the telescopic guide sleeve 2 via a first top screw 8;

[0038] One side of the movable end 4 is fixedly connected to the movable ejector pin 3 via a second ejector screw 9 .

[0039] The fixed end 1 and telescopic guide sleeve 2 are fixedly connected by a first jackscrew 8. This allows the telescopic guide sleeve 2 to be securely mounted on the fixed end 1, facilitating assembly and disassembly of the telescopic guide sleeve 2. The movable end 4 and movable ejector pin 3 are fixedly connected by a second jackscrew 9. This ensures that the movable ejector pin 3 can slide within the sleeve while maintaining a tight connection with the movable end 4, facilitating its replacement.

[0040] Preferably, threaded sleeves are fixed at both ends of the fixed end 1 and the movable end 4, and the handle 5 and the end of the detection rod 6 are threadedly connected to the threaded sleeves. The fixed end 1 and the movable end 4 are of the same length, ensuring that the detection rod 6 is installed on the fixed end 1 and the movable end 4 and extends to the same length.

[0041] Threaded sleeves are provided at both the fixed end 1 and the movable end 4, to which the handle 5 and the detection rod 6 are connected by threads. This threaded connection provides excellent mechanical strength and tightness, while also facilitating disassembly and replacement of components. The fixed end 1 and the movable end 4 are of the same length, extending to the same length. This is crucial for maintaining consistent and accurate measurements, especially when comparing measurements at different locations.

[0042] Preferably, the detection rods 6 are provided in two sets, two of each size, and the two sets of 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 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.

[0043] Preferably, the end of the detection rod 6 is hemispherical and rests on the conical surface of the workpiece. 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 rest on the inner wall of the workpiece through the positioning arc surfaces and are pushed by the spring 7 to achieve automatic centering.

[0044] The hemispherical end of the rod provides a stable contact point during measurement and can accommodate small irregularities or variations in the workpiece's tapered surface. The hemispherical design also ensures single-point contact between the rod and the tapered surface, improving measurement accuracy. Positioning arcs are located on the outside of the fixed end 1 and the movable end 4, designed to fit snugly against the workpiece's inner wall. The positioning arcs are automatically adjusted by the push of spring 7, ensuring the device remains centered within the workpiece's inner hole, improving measurement consistency and accuracy.

[0045] Example 2

[0046] like Figures 1-3 As shown, in combination with Example 1, a method for using the inner hole cone angle detection device is further described, and the method steps are as follows:

[0047] S1. Select the appropriate length of the movable ejector pin 3 and the telescopic guide sleeve 2 according to the inner hole diameter of the workpiece;

[0048] S2. According to the cone angle a° of 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;

[0049] S3, the detection rod 6R 小 Assemble with the detection device and check whether the length L is consistent;

[0050] 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 axial designated position to ensure that the two detection rods 6R 小 All are in contact with the cone surface;

[0051] 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 ;

[0052] S6. Take out the detection device and disassemble the detection rod 6R 小 , insert the detection stick 6R 大 Assemble with the detection device and check whether the length L is consistent;

[0053] S7, repeat steps S4 and S5 to ensure that the two detection rods 6R 大All are in contact with the cone surface, and A is measured 大 ;

[0054] S8, the workpiece inner cone angle a°, the allowable tolerance is ±c°, obtained by calculation:

[0055] (A 小 -A 大 ) Value range:

[0056] (A 小 -A 大 ) 最大 =(R 大 -R 小 )×[1-sin(a°-c°)]

[0057] (A 小 -A 大 ) 最小 =(R 大 -R 小 )) ×[1-sin(a°+c°)]

[0058] (A 大 ) 最大 =A 小 - (R 大 -R 小 )) ×[1-sin(a°-c°)]

[0059] (A 大 ) 最小 =A 小 - R 大 -R 小 )) ×[1-sin(a°+c°)]

[0060] When A 大 The actual measured value satisfies (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.

[0061] 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 on the inner wall of the inner hole.

[0062] ​By selecting different-sized probe rods for two measurements and utilizing trigonometric calculations, measurement accuracy is improved. The positioning arc and spring design enable the device to automatically adjust to the optimal measurement position for workpiece bores of varying sizes. The consistent extension of the probe rod ensures consistent measurement conditions and reduces sources of error. Repeated measurements and data analysis enhance the reliability and accuracy of measurement results.

[0063] The above embodiments are merely preferred technical solutions of the present invention and should not be construed as limiting the present invention. The scope of protection of the present invention shall be the technical solutions set forth in the claims, including equivalent alternatives to the technical features of the technical solutions set forth in the claims. Equivalent alternatives and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A device for detecting the angle of an inner hole cone, characterized by comprising: 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 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 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. The device for detecting the angle of an inner hole cone according to claim 1, wherein: Sleeves are provided on both sides of the telescopic guide sleeve (2), and the movable ejector pin (3) slides against the sleeves.

3. The device for detecting the angle of an inner hole cone according to claim 1, wherein: 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 device for detecting the angle of an inner hole cone according to claim 1, wherein: 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 device for detecting the angle of an inner hole cone according to claim 1, wherein: The detection rods (6) are provided in two sets, two in each size, and the two sets of detection rods (6) are installed at the fixed end (1) and the movable end (4) with the same extension length.

6. The device for detecting the inner hole cone angle 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) rests on the conical surface of the workpiece.

7. The device for detecting the angle of an inner hole cone according to any one of claims 1, 3 and 4, wherein: 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 the spring (7).

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