An assembly process bore site coaxiality detection device

Abstract

The utility model belongs to the precise rotary machinery technical field relates to a kind of assembly process inner hole position coaxiality detection device. Contain: datum seat, measuring guide rod, dial gauge;The extension bar of datum seat is equipped with measuring guide rod and dial gauge in proper order, the measuring guide rod is Z type structure, measuring guide rod passes through the first recess on datum seat, and measuring guide rod is connected on datum seat using cylindrical pin, so that measuring guide rod can realize swing under the constraint of the first recess, after the measuring end of dial gauge passes through the second recess on datum seat, the single ear of dial gauge is inserted into the double ear of datum seat, and dial gauge is fixed with datum seat using knurled head screw;The end of dial gauge and measuring guide rod overlaps, and the other end of measuring guide rod is used to contact with the inner hole surface of the component to be measured.The utility model structure is simple, easy to operate, can directly effectively detect the coaxiality error between different hole positions in assembly process, without position conversion between assembly and measurement, improve efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of precision rotating machinery technology and relates to a device for detecting the coaxiality of holes during the assembly process. Background Technology

[0002] Coaxiality, as one of the key geometric tolerance indicators for precision rotating machinery (such as aero engines and gas turbines), directly affects the operational performance and reliability of the rotor system. Besides the manufacturing precision of the components themselves, the assembly process also introduces a certain degree of coaxiality error. Furthermore, the coaxiality error introduced during assembly accumulates as it is transmitted between components, severely impacting the final assembly quality. Currently, coaxiality measurements during assembly are limited, and the complex cavity structure and spatial interference of internal components make it difficult for conventional measuring equipment to reach critical inspection areas, greatly increasing the difficulty of measurement. The off-site inspection mode relying on coordinate measuring machines (CMMs) cannot achieve real-time measurement feedback, significantly extending the development cycle, and has high usage and maintenance costs, resulting in poor economic efficiency. There is an urgent need to develop efficient and easy-to-use in-situ inspection devices to monitor coaxiality errors during assembly to meet practical engineering needs. Utility Model Content

[0003] Utility Model Purpose This invention provides a tooling for detecting the coaxiality of internal bores during the assembly process of a turbine starter, in order to solve the problems of high maintenance costs, poor economy, and inability to better meet coaxiality error requirements in the prior art.

[0004] Technical solution A device for detecting the coaxiality of internal holes during assembly includes: a reference base (2), a measuring guide rod (5), and a dial indicator (1); the measuring guide rod (5) and the dial indicator (1) are sequentially provided on the extension rod of the reference base (2). The measuring guide rod (5) has a Z-shaped structure. The measuring guide rod (5) passes through the first groove on the reference base (2) and is connected to the reference base (2) by a cylindrical pin (4), so that the measuring guide rod (5) can swing under the constraint of the first groove. After the measuring end of the dial indicator (1) passes through the second groove on the reference base (2), the single ear of the dial indicator (1) is inserted into the double ear of the reference base (2), and the dial indicator (1) is fixed to the reference base (2) by a knurled flat head screw (3); one end of the dial indicator (1) overlaps with the measuring guide rod (5), and the other end of the measuring guide rod (5) is used to contact the inner hole surface of the component to be measured (7).

[0005] Furthermore, the width of the first groove is greater than the width of the measuring guide rod (5), so that the measuring guide rod (5) can rotate around the cylindrical pin (4) as the axis.

[0006] Furthermore, a circular protrusion is provided at the point where the measuring guide rod (5) engages with the cylindrical pin (4), which makes the measuring guide rod (5) rotate more smoothly and prevents jamming.

[0007] Furthermore, the lever arms at both ends of the measuring guide rod (5) are of equal length, and the cylindrical pin (4) can maintain the relative balance between the two ends of the measuring guide rod (5) after passing through the measuring guide rod (5).

[0008] Furthermore, the reference base (2) is a cylindrical structure with an extension rod on it. The length of the extension rod should ensure that the measuring guide rod (5) will not interfere with the measurement.

[0009] Furthermore, the cylindrical structure has a threaded hole at its center, which is fixed to the center hole of the component to be tested (7) by a positioning screw (6).

[0010] The beneficial effects of this application are as follows: This invention has a simple structure and is easy to operate. It can directly and effectively detect the coaxiality error between different holes during the assembly process. No station conversion is required between assembly and measurement, which improves efficiency. Attached Figure Description

[0011] Figure 1 This is a two-dimensional structural schematic diagram of the present invention. Figure 2 This is a schematic diagram of the three-dimensional structure; In the diagram: 1. Dial indicator; 2. Reference base; 3. Knurled flat head screw; 4. Cylindrical pin; 5. Measuring guide rod; 6. Screw; 7. Component to be measured.

[0012] Figure 3 This is a schematic diagram of the structure of the reference base (2). Figure 4 This is a schematic diagram of the structure of the measuring guide rod (5). Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions in the embodiments of this utility model will be described in more detail below with reference to the embodiments of this utility model. In the examples, the same or similar reference numerals denote the same or similar components or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this utility model. The embodiments described below with reference to the embodiments are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. The embodiments of this utility model will be described in detail below with reference to their specific implementation.

[0014] The reference base (2) has a threaded hole at its center, which can be fixed to the center hole of the component to be measured (7) by a positioning screw (6), with the rotation center of the component to be measured (7) as the measurement reference. The reference base (2) can be connected to the measuring guide rod (5) and the dial indicator (1) in sequence along the axial direction. The measuring guide rod (5) has a near "Z" shaped structure, is connected to the reference base (2) by a cylindrical pin (4), and can rotate around the reference base (2) with the central axis of the pin hole as the rotation center. One end of the measuring guide rod (5) contacts the surface to be measured, and the other end face near the rotation center contacts the probe of the dial indicator (1). The dial indicator (1) is a digital dial indicator that can transmit data, which is fixed to the reference base by a knurled flat head screw (3). The dial indicator can also be connected to a computer via a data cable to import the measurement data into the computer in real time for easy observation and analysis.

[0015] Example: An assembly process internal hole coaxiality detection device includes a reference base (2), a measuring guide rod (5), a dial indicator (1), a positioning screw (6) for fixing the reference base, a cylindrical pin (4) for fixing the measuring guide rod, and a knurled flat-head screw (3) for fixing the dial indicator. During measurement, the measuring guide rod (5) is first brought into contact with the surface of the internal hole to be measured, and then the positioning screw (6) connected to the center of the reference base (2) is tightened. There are two measurement methods: one is to fix the positioning screw (6) so that the reference base (2) rotates counterclockwise out of the positioning screw (6), at which point the movement trajectory of the measuring guide rod (5) along the surface of the internal hole to be measured is a spiral line; the other is to rotate the reference base (2) together with the positioning screw (6), at which point the movement trajectory of the measuring guide rod (5) along the surface of the internal hole to be measured is a circle. Radial fluctuations of the surface to be measured will cause the measuring guide rod (5) to rotate, changing the reading of the dial indicator (1). Because the two contact points of the measuring guide rod (5) and the surface to be measured and the dial indicator (1) probe are approximately equidistant from the center of rotation, the radial fluctuation is equal to the change in the dial indicator (1) reading. Therefore, the coaxiality of the surface to be measured is numerically equivalent to the difference between the maximum and minimum readings of the dial indicator (1) during the measurement process. Thus, the detection of the coaxiality of the inner holes between different components during the assembly process is achieved.

[0016] Furthermore, unless otherwise defined, the technical or scientific terms used in this application description shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "upper," "lower," "left," "right," "center," "vertical," "horizontal," "inner," and "outer," etc., used in this application description to indicate relative direction or positional relationship are used only to indicate relative orientation or positional relationship, and do not imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. When the absolute position of the described object changes, its relative positional relationship may also change accordingly, and therefore should not be construed as a limitation on this application. The terms "first," "second," "third," and similar terms used in this application description are used only for descriptive purposes to distinguish different components, and should not be construed as indicating or implying relative importance. The terms "a," "one," or "the," etc., used in this application description should not be construed as an absolute limitation on quantity, but should be construed as indicating the existence of at least one. The terms "including," "comprising," etc., used in this application description mean that the element or object preceding the word covers the element or object listed after the word and its equivalents, without excluding other elements or objects.

[0017] Furthermore, it should be noted that, unless otherwise explicitly specified and limited, terms such as “installation,” “connection,” and “linkage” used in the description of this application should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; or it can be a connection within two components. Those skilled in the art can understand its specific meaning in this application according to the specific circumstances.

[0018] The above description is merely a specific embodiment of this utility model and is not intended to limit this utility model. Within the spirit and principles of this utility model, any person skilled in the art may use the above-disclosed technical content to make changes or modifications to equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of this utility model without departing from the technical solution of this utility model, as well as any modifications, equivalent substitutions, improvements, etc., should be included within the protection scope of this utility model.

Claims

1. A device for detecting the coaxiality of holes during assembly, characterized in that, include: Reference base (2), measuring guide rod (5), dial indicator (1); The measuring guide rod (5) and dial indicator (1) are sequentially provided on the extension rod of the reference base (2). The measuring guide rod (5) has a Z-shaped structure. The measuring guide rod (5) passes through the first groove on the reference base (2) and is connected to the reference base (2) by a cylindrical pin (4), so that the measuring guide rod (5) can swing under the constraint of the first groove. After the measuring end of the dial indicator (1) passes through the second groove on the reference base (2), the single ear of the dial indicator (1) is inserted into the double ear of the reference base (2). The dial indicator (1) is fixed to the reference base (2) by a knurled flat head screw (3). One end of the dial indicator (1) overlaps with the measuring guide rod (5), and the other end of the measuring guide rod (5) is used to contact the inner hole surface of the component to be measured (7).

2. The apparatus as claimed in claim 1, characterized in that, The width of the first groove is greater than the width of the measuring guide rod (5), so that the measuring guide rod (5) can rotate about the cylindrical pin (4) as the axis.

3. The apparatus as described in claim 1, characterized in that, The measuring guide rod (5) has a circular protrusion at the point where it engages with the cylindrical pin (4), which makes the measuring guide rod (5) rotate more smoothly and prevents it from getting stuck.

4. The apparatus as described in claim 3, characterized in that, The lever arms at both ends of the measuring guide rod (5) are of equal length. After the cylindrical pin (4) passes through the measuring guide rod (5), it can maintain the relative balance between the two ends of the measuring guide rod (5).

5. The apparatus as claimed in claim 1, characterized in that, The reference base (2) is a cylindrical structure with an extension rod on it. The length of the extension rod should ensure that the measuring guide rod (5) will not interfere with the measurement.

6. The apparatus as claimed in claim 5, characterized in that, The cylindrical structure has a threaded hole at its center, which is fixed to the center hole of the component to be tested (7) by a positioning screw (6).

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