Device for measuring central hole length of shaft part
By designing a center hole measuring device for shaft parts, which includes a handle, an eccentric pull rod, and an electronic depth gauge, the problem of large measurement error in small-diameter center holes of shaft parts was solved, and high-precision and fast digital measurement was achieved.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- INNER MONGOLIA MENGDA POWER GENERATION CO LTD
- Filing Date
- 2025-11-13
- Publication Date
- 2026-06-04
AI Technical Summary
In existing technologies, high-precision length measurement cannot be achieved for small-diameter center holes of shaft parts, and ordinary measuring tools have large measurement errors.
A measuring device comprising a handle, an eccentric pull rod, an electronic depth gauge, and measuring jaws was designed. By cooperating with the eccentric pull rod and measuring jaws, and combining the readings of the electronic depth gauge, a digital and high-precision measurement of the center hole of shaft-type parts can be achieved.
It achieves high-precision and rapid measurement of the center hole length of shaft parts, with a measurement accuracy of 0.01mm, eliminating the measurement error of ordinary measuring tools.
Smart Images
Figure CN2025134611_04062026_PF_FP_ABST
Abstract
Description
A device for measuring the length of the center hole of a shaft-type part Technical Field
[0001] This invention belongs to the field of center hole length measurement technology for shaft parts, and specifically relates to a device for measuring the center hole length of shaft parts. Background Technology
[0002] Currently, the small-diameter center holes machined for shaft parts are characterized by their small diameter and large length. Precision measuring tools such as calipers and micrometers cannot reach deep into these small-diameter center holes to accurately measure their length. Only existing ordinary measuring tools, such as tape measures, can be used to reach deep into these small-diameter center holes for length measurement. However, the measurement accuracy of ordinary measuring tools is limited, resulting in significant errors during measurement. Summary of the Invention
[0003] The present invention aims to solve at least one of the technical problems existing in the prior art, and to provide a new technical solution for a device for measuring the length of the center hole of shaft parts.
[0004] According to a first aspect of the present invention, a device for measuring the length of the center hole of a shaft-type part is provided, comprising:
[0005] The device includes a handle, an eccentric pull rod, an electronic depth gauge, and measuring jaws. The eccentric pull rod is vertically positioned at the bottom of the handle; the electronic depth gauge is positioned at the top of the handle; and the measuring jaws are positioned at the end of the eccentric pull rod furthest from the handle.
[0006] A measuring ruler, wherein the measuring ruler is provided with a central hole; the eccentric tie rod passes through the central hole, and the measuring jaws are used to engage with the lower surface of the part to be measured;
[0007] A standard cylinder and a tensioning cylinder are both sleeved on the outside of the measuring scale, and the tensioning cylinder moves along the measuring scale. The standard cylinder is used to calibrate the measuring device.
[0008] A tensioning screw passes vertically through the handle and is threadedly connected to the handle; the tensioning screw is used to abut against the upper end face of the tensioning cylinder;
[0009] When measuring the length of the center hole of the part to be measured, the measuring jaw extends from the lower end of the center hole of the part to be measured and rotates 180°. By adjusting the tension screw, the measuring jaw is engaged with the lower end face of the part to be measured, and the lower end face of the tensioning cylinder is engaged with the upper end face of the part to be measured. The vernier scale of the electronic depth gauge passes through the handle and is in contact with the upper end face of the tensioning cylinder. The length of the center hole of the part to be measured is obtained by reading the electronic depth gauge.
[0010] Optionally, the eccentric tie rod is fixed to the handle by a pin.
[0011] Optionally, the eccentric tie rod and the measuring jaw are fixed together by a pin.
[0012] Optionally, there may be multiple standard cylinders, and each standard cylinder may have a different length.
[0013] Optionally, the number of standard cylinders is three.
[0014] Optionally, the lengths of the three standard cylinders are 200mm, 400mm, and 600mm, respectively.
[0015] Optionally, the measurement accuracy of the electronic depth gauge is 0.01 mm.
[0016] Optionally, when measuring the length of the center hole of the part to be measured, the measuring device is first calibrated using the standard cylinder, and then the length of the center hole of the part to be measured is measured after the standard cylinder is removed.
[0017] Optionally, the length of the tensioning cylinder is 200 mm.
[0018] Optionally, the length of the measuring ruler is greater than the sum of the lengths of the standard cylinder and the tensioning cylinder.
[0019] One technical advantage of this invention is that:
[0020] In this embodiment of the application, the shaft part center hole length measuring device can realize digital measurement of the center hole length of shaft parts, achieving large range, high precision and fast measurement, fundamentally solving the technical problem of measuring the center hole length of shaft parts.
[0021] In addition, the center hole length measuring device for this shaft part adopts precision measurement technology, which eliminates the measurement error of ordinary measuring tools and can improve the measurement accuracy to 0.01mm. Attached Figure Description
[0022] Figure 1 is a schematic diagram of a device for measuring the length of the center hole of a shaft part according to an embodiment of the present invention;
[0023] Figure 2 is a reference diagram of the first usage state of a shaft-type part center hole length measuring device according to an embodiment of the present invention;
[0024] Figure 3 is a reference diagram of the second usage state of a shaft-type part center hole length measuring device according to an embodiment of the present invention.
[0025] In the diagram: 1. Handle; 2. Eccentric pull rod; 3. Electronic depth gauge; 31. Vernier caliper;
[0026] 4. Measuring jaws; 5. Part to be measured; 6. Standard cylinder; 7. Tensioning cylinder; 8. Tensioning screw;
[0027] 9. Measuring ruler. Detailed Implementation
[0028] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values of the components and steps set forth in these embodiments do not limit the scope of the present application.
[0029] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0030] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.
[0031] In the description of this application, 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", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element 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 application.
[0032] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0033] According to a first aspect of the present invention, referring to Figures 1 to 3, a device for measuring the length of the center hole of a shaft-type part is provided, comprising:
[0034] The device includes a handle 1, an eccentric pull rod 2, an electronic depth gauge 3, and a measuring jaw 4. The eccentric pull rod 2 is vertically arranged at the bottom of the handle 1; the electronic depth gauge 3 is arranged at the top of the handle 1; and the measuring jaw 4 is arranged at the end of the eccentric pull rod 2 away from the handle 1.
[0035] Measuring ruler 9, which has a central hole; the eccentric pull rod 2 passes through the central hole, and the measuring jaw 4 is used to engage with the lower surface of the part to be measured 5;
[0036] The standard cylinder 6 and the tensioning cylinder 7 are both sleeved on the outside of the measuring scale 9, and the tensioning cylinder 7 moves along the measuring scale 9. The standard cylinder 6 is used to calibrate the measuring device.
[0037] Tensioning screw 8 passes through the handle 1 vertically and is threadedly connected to the handle 1; the tensioning screw 8 is used to abut against the upper end face of the tensioning cylinder 7;
[0038] When measuring the length of the center hole of the part to be measured 5, the measuring jaw 4 extends from the lower end of the center hole of the part to be measured 5 and rotates 180°. By adjusting the tension screw 8, the measuring jaw 4 is engaged with the lower end face of the part to be measured 5, and the lower end face of the tensioning cylinder 7 is engaged with the upper end face of the part to be measured 5. The vernier scale 31 of the electronic depth gauge 3 passes through the handle 1 and is in contact with the upper end face of the tensioning cylinder 7. The length of the center hole of the part to be measured 5 is obtained by reading the electronic depth gauge 3.
[0039] In this embodiment of the application, the shaft part center hole length measuring device can realize digital measurement of the center hole length of shaft parts, achieving large range, high precision and fast measurement, fundamentally solving the technical problem of measuring the center hole length of shaft parts.
[0040] In addition, the center hole length measuring device for this shaft part adopts precision measurement technology, which eliminates the measurement error of ordinary measuring tools and can improve the measurement accuracy to 0.01mm.
[0041] For example, the eccentric pull rod 2 passes through the center hole of the measuring scale 9, and the eccentric pull rod 2, handle 1, and measuring jaw 4 form an integral structure. The body of the electronic depth gauge 3 is fixed to the handle 1, and the vernier scale 31 passes through the handle 1 and is in contact with the upper end face of the tensioning cylinder 7; the tensioning screw 8 passes through the threaded through hole on the handle 1 and is in contact with the upper end face of the tensioning cylinder 7. The tensioning cylinder 7 and the standard cylinder 6 pass through the body of the measuring scale 9 together to form a measurement standard system.
[0042] Optionally, the eccentric pull rod 2 is fixed to the handle 1 by a pin. This makes the fixing method of the eccentric pull rod 2 and the handle 1 relatively simple.
[0043] Optionally, the eccentric tie rod 2 and the measuring jaw 4 are fixed together by a pin. This makes the fixing method of the eccentric tie rod 2 and the measuring jaw 4 relatively simple.
[0044] Optionally, the number of standard cylinders 6 is multiple, and each standard cylinder 6 has a different length. This expands the measurement range of the center hole length measuring device for shaft-type parts and is very convenient to use.
[0045] Optionally, the number of standard cylinders 6 is three. This enables quick and accurate measurement of the center hole length of shaft-type parts.
[0046] Optionally, the lengths of the three standard cylinders 6 are 200mm, 400mm, and 600mm, respectively. This makes the measuring device very convenient to use.
[0047] Optionally, the electronic depth gauge 3 has a measurement accuracy of 0.01 mm. This results in high measurement accuracy of the electronic depth gauge 3, improving the accuracy of measuring the length of the center hole of shaft parts.
[0048] Optionally, when measuring the length of the center hole of the part 5 to be measured, the measuring device is first calibrated using the standard cylinder 6, and then the standard cylinder 6 is removed before measuring the length of the center hole of the part 5 to be measured. This makes the measurement of the center hole length of shaft parts very convenient.
[0049] Optionally, the tensioning cylinder 7 has a length of 200 mm. This facilitates the rapid measurement of the center hole length of shaft-type parts.
[0050] Optionally, the length of the measuring ruler 9 is greater than the sum of the lengths of the standard cylinder 6 and the tensioning cylinder 7. This facilitates the rapid measurement of the center hole length of shaft-type parts, and the measurement method is relatively simple.
[0051] In one specific implementation, the design scheme of the shaft center hole length measuring device is as follows:
[0052] The design employs a digital electronic depth gauge with a measuring range of 200mm as the external measuring ruler 9, achieving a measurement accuracy of 0.01mm. Simultaneously, three length categories are categorized for shaft center holes, and the measuring device is designed accordingly with three different specifications. When measuring the length of a shaft center hole, the measuring device is directly selected based on the center hole length, facilitating rapid operation. Specifically, the specifications of the measuring device are shown in Table 1.
[0053] Table 1 shows the design schemes for shaft center hole length measuring devices (unit: mm).
[0054]
[0055] Specific implementation method: The measurement device is used to measure the length of the center hole of shaft parts. The measurement steps can be divided into three steps: selecting the measuring device, calibrating the standard cylinder, zeroing the electronic depth gauge, and formal measurement.
[0056] For example: First, when measuring the length of the center hole of a shaft part with a length of 377mm, select measuring device 1 from the design scheme in Table 1; Second, insert the 200mm standard cylinder into the measuring device, rotate the handle 180°, and the handle will drive the eccentric pull rod and measuring jaw to rotate. Due to the eccentric principle, the measuring jaw will rotate and extend from the lower part of the measuring scale; Next, tighten the tension screw. Under the support of the tension cylinder, the tension screw will drive the handle, eccentric pull rod, and measuring jaw to move upward until the measuring jaw is in close contact with the lower end face of the standard cylinder; At this time, push the lower end face of the vernier scale of the electronic depth gauge downward to contact the upper end face of the tension cylinder, and the electronic digital display scale can be zeroed; Then push the electronic depth gauge body upward to the top, remove the standard cylinder, and you can officially measure the length of the center hole of the shaft part.
[0057] The third step is to insert the zero-point calibrated measuring device into the center hole of the shaft-like part being measured. Rotate the handle of the eccentric pull rod 180°, causing the eccentric measuring jaws to extend from the bottom of the center hole. Tighten the tightening screw until the measuring jaws are tightly fitted against the lower end face of the center hole. At this point, push the electronic depth gauge downwards so that the lower end face of the vernier caliper is in contact with the upper end face of the tensioning cylinder. If the electronic depth gauge displays 177.51 mm, then the actual length of the center hole of the shaft-like part being measured is 200 mm + 177.51 mm = 377.51 mm. Specific measurement diagrams are shown in Figures 2 and 3.
[0058] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.
Claims
1. A device for measuring the length of the center hole of a shaft-type part, characterized in that, include: The device includes a handle, an eccentric pull rod, an electronic depth gauge, and measuring jaws. The eccentric pull rod is vertically positioned at the bottom of the handle; the electronic depth gauge is positioned at the top of the handle; and the measuring jaws are positioned at the end of the eccentric pull rod furthest from the handle. A measuring ruler, wherein the measuring ruler is provided with a central hole; the eccentric tie rod passes through the central hole, and the measuring jaws are used to engage with the lower surface of the part to be measured; A standard cylinder and a tensioning cylinder are both sleeved on the outside of the measuring scale, and the tensioning cylinder moves along the measuring scale. The standard cylinder is used to calibrate the measuring device. A tensioning screw passes vertically through the handle and is threadedly connected to the handle; the tensioning screw is used to abut against the upper end face of the tensioning cylinder; When measuring the length of the center hole of the part to be measured, the measuring jaw extends from the lower end of the center hole of the part to be measured and rotates 180°. By adjusting the tension screw, the measuring jaw is engaged with the lower end face of the part to be measured, and the lower end face of the tensioning cylinder is engaged with the upper end face of the part to be measured. The vernier scale of the electronic depth gauge passes through the handle and is in contact with the upper end face of the tensioning cylinder. The length of the center hole of the part to be measured is obtained by reading the electronic depth gauge.
2. The shaft part center hole length measuring device according to claim 1, wherein The eccentric pull rod is fixed to the handle by a pin.
3. The shaft part center hole length measuring device according to claim 1, wherein The eccentric tie rod and the measuring jaw are fixed together by a pin.
4. The shaft part center hole length measuring device according to claim 1, wherein There are multiple standard cylinders, and each standard cylinder has a different length.
5. The shaft center bore length measuring device of claim 4, wherein, The number of standard cylinders is three.
6. The shaft center bore length measuring device of claim 5, wherein, The lengths of the three standard cylinders are 200mm, 400mm, and 600mm, respectively.
7. The shaft center bore length measuring device of claim 1, wherein, The measurement accuracy of the electronic depth gauge is 0.01 mm.
8. The shaft center bore length measuring device of claim 1, wherein, When measuring the length of the center hole of the part to be measured, the measuring device is first calibrated using the standard cylinder, and then the length of the center hole of the part to be measured is measured after the standard cylinder is removed.
9. The shaft center bore length measuring device of claim 1, wherein, The length of the tensioning cylinder is 200mm.
10. The shaft center bore length measuring device of claim 1, wherein, The length of the measuring ruler is greater than the sum of the lengths of the standard cylinder and the tensioning cylinder.