Inner diameter measuring device with force measuring mechanism and inner diameter measuring method

Abstract

The invention discloses an inner diameter measuring device with a force measuring mechanism and an inner diameter measuring method.The inner diameter measuring device comprises a hollow tubular ruler frame, the front face or / and the rear face of the ruler frame is / are hollowed out, the left end of the ruler frame is detachably connected with a micrometer head, and the right end of the ruler frame is detachably connected with a measuring head; the micrometer head comprises a micrometric screw, a threaded shaft sleeve, a fixed sleeve, a microdrum and a force measuring device, when the micrometer head is connected with the left end of the ruler frame, the micrometric screw extends out of the left end of the ruler frame, and when the measuring head is connected with the right end of the ruler frame, the right end of the measuring head extends out of the right end of the ruler frame. The measuring method provided by the invention adopts the inner diameter measuring device. According to the invention, force measurement fluctuation caused by human factors during inner diameter measurement is eliminated, the precision of inner diameter measurement is ensured, and the abrasion to the inner wall of the measured workpiece and the micrometric screw during the measurement process is reduced. The measuring head has various specifications and is suitable for measuring the inner diameters of different sizes, and the universality of the inner diameter measuring device is improved.

Description

Technical Field

[0001] This invention relates to the field of precision measurement technology, and in particular to an inner diameter measuring device and method with a force measuring mechanism. Background Technology

[0002] In the manufacturing of large equipment such as shipbuilding, precise measurement of the diameter of equipment or workpiece holes is a crucial step in ensuring assembly quality. Currently, the industry typically uses vernier calipers or inside micrometers for this type of measurement.

[0003] However, existing technologies have significant limitations: First, due to their structural principles, vernier calipers suffer from insufficient centering and positioning accuracy when measuring inner diameters, resulting in large variations in measurement values ​​and low precision, making it difficult to meet high-precision requirements. Second, although inside micrometers offer superior measurement accuracy compared to vernier calipers, their measurement results are more systematically skewed compared to outside micrometers. This is primarily because conventional inside micrometers lack a standardized force-measuring device, making their measurement results highly dependent on the operator's feel and experience. The magnitude of the measuring force, controlled manually by touch, varies from person to person, directly introducing significant "force error." Practice shows that measurement differences between different operators using existing inside micrometers can generally reach 5–15 µm, severely impacting the accuracy and consistency of measurement data.

[0004] Therefore, in order to eliminate force fluctuations caused by human factors, reduce systematic errors between inner and outer diameter measurements, and achieve uniformity and reliability of measurement results, there is an urgent need for an inner diameter measuring device that can provide a constant measuring force. Summary of the Invention

[0005] In view of the deficiencies in the prior art, this application provides an inner diameter measuring device and an inner diameter measuring method with a force measuring mechanism to solve the technical problems such as the low measurement accuracy of the inner diameter measuring device in the prior art.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solution: An internal diameter measuring device with a force measuring mechanism includes a hollow tubular frame with a hollow front and / or rear. The left end of the frame has a first through hole, and the right end has a first threaded hole. Both the first through hole and the first threaded hole communicate with the tube cavity of the frame. The first through hole, the first threaded hole, and the tube cavity are all arranged along the central axis of the frame. The left end of the frame has a micrometer head that is detachably connected to the left end of the frame. The micrometer head can be placed inside the frame through the hollow part. The left end of the frame has a stop threaded hole along the radial direction of the frame. The right end of the frame has a probe that is detachably connected to the right end of the frame. The micrometer head includes a micrometer screw, a threaded bushing, a micrometer cylinder, a force measuring device, and a fixed sleeve. The micrometer screw passes through the threaded bushing and is threadedly connected to it. The left end of the micrometer screw extends out of the threaded bushing. The fixed sleeve is fixedly fitted onto the right end of the threaded bushing. A main sleeve is fitted on the right side of the fixed sleeve, and the main sleeve can rotate and move on the fixed sleeve to drive the micrometer screw to move left and right. A scale is provided on the surface of the fixed sleeve. A force measuring device is provided at the left end of the main sleeve to drive the micrometer screw to move left and right. When the force at the measuring end of the micrometer screw reaches a preset value, the force measuring device cannot drive the micrometer screw to move. The threaded bushing is fixed inside the first through hole to connect the micrometer head to the left end of the scale holder. The micrometer screw extends out of the left end of the scale holder. A stop screw is provided in the stop threaded hole to fix the length of the micrometer screw extending out of the left end of the scale holder. The probe is threadedly connected to the first through-threaded hole, and the right end of the probe extends out of the right end of the ruler frame.

[0007] In one embodiment, the left end of the ruler frame is provided with a second through threaded hole along the radial direction of the ruler frame, and a fastening screw is threaded onto the second through threaded hole. When the left end of the ruler frame needs to fix the micrometer head, the end of the fastening screw passes through the second through threaded hole and abuts the threaded shaft against the inner wall of the first through circular hole.

[0008] In one embodiment, the angle between the second through threaded hole and the stop threaded hole is 90 degrees.

[0009] In one embodiment, the diameter of the first through hole 41 is 0.05-0.1 mm larger than the outer diameter of the threaded bushing, and the left end face of the micrometer screw is spherical.

[0010] In one embodiment, the probe includes a cylindrical section and a threaded section that matches a first through threaded hole. The threaded section and the cylindrical section are coaxially fixedly connected. The diameter of the threaded section is larger than the diameter of the cylindrical section. The end face of the cylindrical end away from the threaded section is spherical. When the probe is fixed to the right end of the ruler frame, the cylindrical end extends out of the right end of the ruler frame.

[0011] In one embodiment, a locking nut is also included. After the probe is threadedly connected to the first through threaded hole, the locking nut is fitted onto the threaded section and abuts against the right end of the ruler frame.

[0012] In one embodiment, both the ruler frame and the probe are made of alloy steel.

[0013] In one embodiment, the left end face of the lumen is perpendicular to the central axis of the ruler, and the diameter of the lumen is larger than the diameter of the first through hole.

[0014] This application also provides an inner diameter measurement method, which uses the above-mentioned inner diameter measuring device with a force measuring mechanism, and includes the following steps: S1. Rotate the differential head to the zero position and place the differential head into the ruler frame through the cutout. S2. Fix the threaded bushing of the micrometer head into the first through hole at the left end of the ruler frame, so that the micrometer screw extends out of the left end face of the ruler frame. Turn the stop screw into the stop threaded hole. Before and during the measurement, the stop screw should be kept in a loose, non-stopped state. S3. Select a probe of appropriate length according to the size of the inner diameter to be measured. Rotate the probe into the outer side of the first through hole at the right end of the ruler frame. Adjust the relative position of the probe and the ruler frame so that the distance between the right end face of the probe and the left end of the micrometer screw is 2-3mm smaller than the diameter of the hole to be measured. This completes the assembly of the inner diameter measuring device. S4. Keep the differential head at zero position, measure and record the distance A from the right end of the cylindrical section on the ruler to the left end of the micrometer screw; S5. Place the inner diameter measuring device into the hole to be measured, rotate the force measuring device to move the left end of the micrometer screw to the left. When the force at the measuring end of the micrometer screw reaches the preset value, the force measuring device can no longer drive the micrometer screw to move, stop the movement of the micrometer screw, stop the stop screw against the micrometer screw, record the reading B of the micrometer head, and the measured inner diameter R = A + B.

[0015] Compared with the prior art, this application has at least the following beneficial effects: This application incorporates a micrometer head in its internal diameter measuring device, controlling the movement of the micro-screw based on the magnitude of the measuring force. This applies the force-measuring mechanism from an outside micrometer to internal diameter measurement, ensuring consistent force in every measurement, eliminating force fluctuations caused by human factors, guaranteeing the accuracy of internal diameter measurements, and solving the problem of precise internal and external diameter measurements between holes and shafts in shipbuilding equipment or workpieces. It also meets the tolerance requirements for fit between holes and shafts, ensuring workpiece machining accuracy and correct equipment installation, and reducing wear on the inner wall of the workpiece and the micrometer screw during measurement. Furthermore, the probe in this application is available in various specifications, suitable for measuring internal diameters of different sizes, thus expanding the versatility of the internal diameter measuring device. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the internal diameter measuring device with a force measuring mechanism in an embodiment of this application; Figure 2 This is a schematic diagram of the ruler frame structure in an embodiment of this application; Figure 3 yes Figure 2 Schematic diagram of the cross section along the AA direction.

[0017] Reference numerals: 1 is the stop screw, 2 is the fastening screw, 3 is the micrometer head, 31 is the micrometer screw, 32 is the threaded bushing, 33 is the micrometer cylinder, 34 is the force measuring device, 35 is the fixed sleeve, 4 is the ruler frame, 41 is the first through hole, 42 is the first through threaded hole, 43 is the second through threaded hole, 44 is the stop threaded hole, 45 is the tube cavity, 5 is the probe, and 6 is the lock nut. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention is described below with reference to specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0019] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The singular forms “a,” “the,” and “the” as used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0020] It should be understood that although the terms first, second, third, etc., may be used in this disclosure to describe various information, such information should not be limited to these terms and should not be construed as indicating or implying relative importance. These terms are used only to distinguish information of the same type from one another. For example, without departing from the scope of this disclosure, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0021] In the description of this invention, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to mechanical connection or internal connection between two components. They can be direct connection or indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0022] To better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings.

[0023] This embodiment provides an inner diameter measuring device with a force measuring mechanism, such as... Figure 1-3As shown, it includes a hollow tubular ruler frame 4, with openwork on the front and back. The left end of the ruler frame 4 is provided with a first through hole 41, and the right end of the ruler frame 4 is provided with a first threaded hole 42. Both the first through hole 41 and the first threaded hole 42 are connected to the tube cavity 45 of the ruler frame. The first through hole 41, the first threaded hole 42 and the tube cavity 45 are all arranged along the central axis of the ruler frame 4. The left end of the ruler frame 4 is provided with a micrometer head 3, which is detachably connected to the left end of the ruler frame 4. The micrometer head 3 can be placed inside the ruler frame through the openwork. The left end of the ruler frame 4 is provided with a stop threaded hole 44 along the radial direction of the ruler frame 4. The right end of the ruler frame 4 is provided with a probe 5, which is detachably connected to the right end of the ruler frame 4. The differential head 3 includes a micrometer screw 31, a threaded bushing 32, a differential cylinder 33, a force measuring device 34, and a fixed sleeve 35. The micrometer screw 31 passes through the threaded bushing 32 and is threadedly connected to the threaded bushing 32. The left end of the micrometer screw 31 extends out of the threaded bushing 32. The fixed sleeve 35 is fixedly fitted onto the right end of the threaded bushing 32. A main sleeve 33 is fitted onto the right side of the fixed sleeve 35. The main sleeve 33 can rotate and move on the fixed sleeve 35 to drive the micrometer screw 31 to move left and right. The surface of 5 is provided with a scale. The left end of the main sleeve 33 is provided with a force measuring device 34 that can drive the micrometer screw 31 to move left and right. When the force at the measuring end of the micrometer screw 3 reaches the preset value, the force measuring device 34 cannot drive the micrometer screw 31 to move. The threaded bushing 32 is fixed inside the first through hole 41 to connect the micrometer head 3 to the left end of the ruler 4. The micrometer screw 31 extends out of the left end of the ruler 4. The stop screw 1 is provided in the stop threaded hole 44 to fix the length of the micrometer screw 31 extending out of the left end of the ruler 4. The probe 5 is threadedly connected to the first through-thread hole 42, and the right end of the probe 5 extends out of the right end of the ruler frame 4.

[0024] A second through-threaded hole 43 is provided radially along the left end of the ruler frame 4. A fastening screw 2 is threaded onto the second through-threaded hole 43. When the left end of the ruler frame 4 needs to be fixed with the micrometer head 3, the end of the fastening screw 2 passes through the second through-threaded hole 43 and presses the threaded bushing 32 against the inner wall of the first through-hole. The angle between the second through-threaded hole 43 and the stop threaded hole 44 is 90 degrees. The diameter of the first through-hole 41 is 0.05-0.1 mm larger than the outer diameter of the threaded bushing 32. The left end face of the micrometer screw 31 is spherical, so that the left end face of the micrometer screw 31 fits more closely to the arc-shaped inner diameter surface during measurement, reducing the damage of the micrometer screw 31 to the inner diameter surface.

[0025] The probe 5 includes a cylindrical section and a threaded section that matches the first through-threaded hole 42. The threaded section and the cylindrical section are coaxially fixedly connected. The diameter of the threaded section is larger than the diameter of the cylindrical section. The end face of the cylindrical end away from the threaded section is spherical. When the probe 5 is fixed to the right end of the ruler 4, the cylindrical end extends beyond the right end of the ruler 4. To ensure the connection stability between the probe 5 and the ruler 4, the inner diameter measuring device in this embodiment also includes a locking nut 6. After the probe 5 is threadedly connected to the first through-threaded hole, the locking nut 6 is fitted onto the threaded section and abuts against the right end of the ruler 4. The ruler 4 can be fixedly connected to probes 5 of different lengths to accurately measure inner diameters of different sizes.

[0026] In this embodiment, both the ruler frame 4 and the probe 5 are made of alloy steel, and the locking nut 6 is made of 45 steel. The diameter of the threaded bushing 32 of the micrometer head is smaller than the diameter of the fixed sleeve 35. There is a vertical step between the threaded bushing 32 and the fixed sleeve 35. In order to better position the micrometer head 3 on the ruler frame 4 and avoid deviations in the measurement values, in this embodiment, the left end face of the cavity 45 is perpendicular to the central axis of the ruler frame 4, and the diameter of the cavity 45 is larger than the diameter of the first through hole 41.

[0027] This embodiment also provides an inner diameter measurement method, which uses the above-mentioned inner diameter measuring device with a force measuring mechanism, and includes the following steps: S1. Rotate the differential head 3 to the zero position and place the differential head 3 into the ruler frame through the cutout of the ruler frame 4.

[0028] S2. Fix the threaded bushing 32 of the micrometer head 3 into the first through hole 41 at the left end of the ruler frame 4, so that the micrometer screw 31 extends out of the left end face of the ruler frame 4, and turn the stop screw 1 into the stop threaded hole 44. Before and during the measurement, the stop screw should be kept in a loose, non-stopped state.

[0029] In this embodiment S2, after the fixing sleeve 32 of the micrometer head 3 extends into the first through hole 41, the second through threaded hole 43 is aligned with the fixing threaded hole on the fixing sleeve 32. The fastening screw 2 is sequentially threadedly connected to the second through threaded hole and the fixing threaded hole to fix the micrometer head 3 to the left end of the ruler frame 4.

[0030] S3. Select a probe 5 of appropriate length according to the size of the inner diameter to be measured. Rotate the probe 3 into the outer side of the first through hole 42 at the right end of the ruler frame. Adjust the relative position of the probe 5 and the ruler frame 4 so that the distance between the right end face of the probe 5 and the left end of the micrometer screw is 2-23mm smaller than the diameter of the hole to be measured. This completes the assembly of the inner diameter measuring device.

[0031] In embodiment S3, the threaded section of the probe 5 is rotated from the right side into the first through hole 42 at the right end of the measuring frame. When the distance from the right end of the cylindrical section on the measuring frame 4 to the left end of the micrometer screw is 2-3 mm smaller than the diameter of the hole being measured, the locking nut 6 is fitted onto the threaded section and pressed against the right end of the measuring frame 4.

[0032] S4. Keep the differential head 3 at zero position, measure and record the distance A from the right end of the cylindrical section on the ruler 4 to the left end of the micrometer screw.

[0033] To ensure measurement accuracy, S4 uses an outside micrometer to measure the distance A from the right end of the cylindrical section on the ruler 4 to the left end of the micrometer screw.

[0034] S5. Place the inner diameter measuring device into the bore to be measured, rotate the force measuring device 34 to move the left end of the micrometer screw 3 to the left. When the measuring force at the measuring end of the micrometer screw 3 reaches the preset value, the force measuring device 34 can no longer drive the micrometer screw 31 to move, stop the movement of the micrometer screw 3, the stop screw 1 abuts against the micrometer screw 3, record the reading B of the differential head 3, and the measured inner diameter R = A + B.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. An inner diameter measuring device with a force measuring mechanism, characterized in that, The device includes a hollow tubular ruler frame with a hollowed-out front and / or rear. The left end of the ruler frame has a first through hole, and the right end of the ruler frame has a first threaded hole. Both the first through hole and the first threaded hole communicate with the tube cavity of the ruler frame. The first through hole, the first threaded hole, and the tube cavity are all located along the central axis of the ruler frame. The left end of the ruler frame has a micrometer head, which is detachably connected to the left end of the ruler frame. The micrometer head can be placed inside the ruler frame through the hollowed-out part. The left end of the ruler frame has a stop threaded hole along the radial direction of the ruler frame. The right end of the ruler frame has a probe head, which is detachably connected to the right end of the ruler frame. The micrometer head includes a micrometer screw, a threaded bushing, a micrometer cylinder, a force measuring device, and a fixed sleeve. The micrometer screw passes through the threaded bushing and is threadedly connected to it. The left end of the micrometer screw extends out of the threaded bushing. The fixed sleeve is fixedly fitted on the right end of the threaded bushing. A main sleeve is fitted on the right side of the fixed sleeve, and the main sleeve can rotate and move on the fixed sleeve to drive the micrometer screw to move left and right. A scale is provided on the surface of the fixed sleeve. A force measuring device is provided at the left end of the main sleeve to drive the micrometer screw to move left and right. When the force at the measuring end of the micrometer screw reaches a preset value, the force measuring device cannot drive the micrometer screw to move. The threaded bushing is fixed inside the first through hole to connect the micrometer head to the left end of the ruler. The micrometer screw extends out of the left end of the ruler. A stop screw is provided in the stop threaded hole to fix the length of the micrometer screw extending out of the left end of the ruler. The probe is threadedly connected to the first through-threaded hole, and the right end of the probe extends out of the right end of the ruler frame.

2. The inner diameter measuring device with a force measuring mechanism according to claim 1, characterized in that, The left end of the ruler frame is provided with a second through threaded hole along the radial direction of the ruler frame. A fastening screw is threaded into the second through threaded hole. When the left end of the ruler frame needs to fix the micrometer head, the end of the fastening screw passes through the second through threaded hole and abuts the threaded shaft against the inner wall of the first through circular hole.

3. The inner diameter measuring device with a force measuring mechanism according to claim 2, characterized in that, The angle between the second through threaded hole and the stop threaded hole is 90 degrees.

4. The inner diameter measuring device with a force measuring mechanism according to claim 1, characterized in that, The diameter of the first through hole is 0.05-0.1 mm larger than the outer diameter of the threaded bushing, and the left end face of the micrometer screw is spherical.

5. The inner diameter measuring device with a force measuring mechanism according to claim 1, characterized in that, The probe includes a cylindrical section and a threaded section that matches the first through threaded hole. The threaded section and the cylindrical section are coaxially fixedly connected. The diameter of the threaded section is larger than the diameter of the cylindrical section. The end face of the cylindrical end away from the threaded section is spherical. When the probe is fixed to the right end of the ruler frame, the cylindrical end extends out of the right end of the ruler frame.

6. The inner diameter measuring device with a force measuring mechanism according to claim 5, characterized in that, It also includes a locking nut. After the probe is threadedly connected to the first through threaded hole, the locking nut is fitted onto the threaded section and abuts against the right end of the ruler frame.

7. The inner diameter measuring device with a force measuring mechanism according to claim 1, characterized in that, Both the ruler frame and the measuring head are made of alloy steel.

8. The inner diameter measuring device with a force measuring mechanism according to claim 1, characterized in that, The left end face of the tube is perpendicular to the central axis of the ruler, and the diameter of the tube is larger than the diameter of the first through hole.

9. A method for measuring inner diameter, characterized in that, The inner diameter measuring device with a force measuring mechanism as described in any one of claims 1-8 includes the following steps: S1. Rotate the differential head to the zero position and place the differential head into the ruler frame through the cutout. S2. Fix the threaded bushing of the micrometer head into the first through hole at the left end of the ruler frame, so that the micrometer screw extends out of the left end face of the ruler frame. Turn the stop screw into the stop threaded hole. Before and during the measurement, the stop screw should be kept in a loose, non-stopped state. S3. Select a probe of appropriate length according to the size of the inner diameter to be measured. Rotate the probe into the outer side of the first through hole at the right end of the ruler frame. Adjust the relative position of the probe and the ruler frame so that the distance between the right end face of the probe and the left end of the micrometer screw is 2-3mm smaller than the diameter of the hole to be measured. This completes the assembly of the inner diameter measuring device. S4. Keep the differential head at zero position, measure and record the distance A from the right end of the cylindrical section on the ruler to the left end of the micrometer screw; S5. Place the inner diameter measuring device into the hole to be measured, rotate the force measuring device to move the left end of the micrometer screw to the left. When the force at the measuring end of the micrometer screw reaches the preset value, the force measuring device can no longer drive the micrometer screw to move, stop the movement of the micrometer screw, stop the stop screw against the micrometer screw, record the reading B of the micrometer head, and the measured inner diameter R = A + B.

Images