Compressor body bearing hole coaxiality inspection structure and method

Abstract

The invention provides a compressor body bearing hole coaxiality detection structure and method, and belongs to the technical field of bearing hole coaxiality measurement, the compressor body bearing hole coaxiality detection structure comprises a crankshaft, a bearing seat, a positioning block, an adjusting frame and a measuring mechanism, the positioning block is clamped with a bearing seat subdivision surface, a stable and repeatable installation reference is established, and the bearing hole coaxiality is detected. The measuring mechanism is adjustably connected to the positioning block through the adjusting frame. The measuring head of the measuring mechanism abuts against the diameter surface of the crankshaft to detect the gap between the surface of the crankshaft on the left side and the right side of the center line of the crankshaft and the horizontal position of the surface of the bearing hole, the horizontal offset of the center of the bearing hole is directly measured through data displayed by the measuring mechanism, and then the coaxiality of the bearing hole is detected. And the situation of inaccurate measurement caused by inconsistent insertion depth of the feeler gauge and large manual judgment error is avoided. The coaxiality detection structure and method are high in universality and convenient to operate, the dependence of field detection on a special tool tile is reduced, and the detection efficiency and data reliability of the coaxiality of the bearing hole of the compressor body are improved.

Description

Technical Field

[0001] This application belongs to the field of bearing bore coaxiality measurement technology, specifically relating to a structure and method for inspecting the coaxiality of bearing bores in a compressor body. Background Technology

[0002] For reciprocating compressors that operate for many years and long cycles, the manufacturing precision can deviate significantly due to a number of factors, such as foundation settlement and load stress. In particular, changes in the relative coaxiality of the main bearing holes in the compressor body severely affect the service life of the crankshaft main bearings. As the coaxiality deviates, the service life of the main bearings decreases from two or three years to two or three months, or even as little as twenty days.

[0003] Currently, such as Figure 1 Generally, the relative coaxiality is measured by placing a tooling pad in the bearing hole of the bearing housing of the machine body being tested, and then using a feeler gauge to measure the difference in clearance between the two horizontal sides of the crankshaft. However, the feeler gauge has no scale, and the insertion depth is difficult to control. It requires the operator's experience to make a judgment, which limits the accuracy of the measurement of the coaxiality of the machine body bearing hole. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0005] Therefore, a first aspect of the present invention provides a structure for inspecting the coaxiality of bearing holes in a compressor body.

[0006] A second aspect of the present invention provides a method for inspecting the coaxiality of bearing holes in a compressor body.

[0007] In view of this, a structure for inspecting the coaxiality of bearing holes in a compressor body is provided according to a first aspect of the embodiments of this application, comprising: Crankshaft and bearing housing; the crankshaft is installed inside the bearing housing. The positioning block is set on the split surface of the bearing hole in the machine body and is engaged with the bearing seat. An adjusting frame, the first end of which is connected to a positioning block; The measuring mechanism is connected to the second end of the adjusting frame, and the measuring head of the measuring mechanism rests against the crankshaft.

[0008] In one feasible implementation, the measuring device is a dial indicator.

[0009] In one feasible implementation, the locating block extends axially along the bearing housing.

[0010] In one feasible implementation, the compressor housing bearing bore coaxiality inspection structure further includes: The crossbeam is set on the bottom surface of the positioning block, parallel to the length direction of the positioning block. The crossbeam is located on the side of the positioning block closest to the crankshaft, and it fits against the surface of the bearing hole.

[0011] In one feasible implementation, the first end of the adjustment frame is connected to the center of the cross-section of the positioning block.

[0012] In one feasible implementation, the adjustment bracket and the positioning block are detachably connected.

[0013] In one feasible implementation, the compressor housing bearing bore coaxiality inspection structure further includes: The connecting hole group includes several connecting holes, which are evenly spaced along the length of the positioning block on the axial direction of the positioning block.

[0014] In one feasible implementation, an internal thread is provided on the inner wall of the connecting hole, and an external thread is provided on the first end of the adjusting bracket, and the adjusting bracket is threadedly connected to one of the connecting holes.

[0015] In one feasible implementation, the spacing between the connecting holes is 18~22mm.

[0016] In one feasible implementation, the adjustment frame includes three rotating arms, which are sequentially rotatably connected by a hinge mechanism. The rotating arm at the first end is connected to the positioning block, and the rotating arm at the second end is connected to the measuring mechanism.

[0017] According to a second aspect of the embodiments of this application, a method for inspecting the coaxiality of bearing bores in a compressor body is provided, applied to the coaxiality inspection structure for bearing bores in a compressor body as described in any of the above technical solutions, comprising: Place the positioning block on the split surface of the bearing hole in the fuselage and lock the positioning block onto the bearing housing; Adjust the adjustment frame so that the measuring head of the measuring mechanism abuts against the diameter surface of the crankshaft, zero the measuring mechanism, and obtain the first measurement reading; Reverse the direction of the positioning block and move it to the split surface on the other side of the bearing hole in the machine body, and lock the positioning block on the bearing seat. Place the measuring head against the diameter surface of the crankshaft to obtain a second measurement reading; The horizontal offset of the bearing bore center relative to the crankshaft centerline is determined based on the difference between the first and second measurement readings.

[0018] The coaxiality inspection structure and method for compressor housing bearing bores disclosed in this application have the following advantages compared to existing technologies: The compressor body bearing bore coaxiality inspection structure provided in this application includes a crankshaft, bearing housing, positioning block, adjusting bracket, and measuring mechanism. The positioning block engages with the bearing housing's split surface to establish a stable and repeatable installation reference. The adjusting bracket adjustably connects the measuring mechanism to the positioning block. The crankshaft is installed inside the bearing bore. After locating the crankshaft center, the measuring head of the measuring mechanism rests on the crankshaft diameter surface to detect the horizontal gap between the crankshaft surface and the bearing bore surface on both sides of the crankshaft centerline. The measuring mechanism displays data to directly measure the horizontal offset of the bearing bore center, thereby detecting the bearing bore coaxiality. This eliminates the need for traditional feeler gauges and tooling structures, avoiding inaccurate measurements due to inconsistent insertion depths of feeler gauges and large human error. It is particularly suitable for inspecting large compressor bodies that have deformed after long-term operation. This coaxiality inspection structure is simple in design, highly versatile, and easy to operate, reducing reliance on specialized tooling for on-site inspections and improving the efficiency and reliability of compressor body bearing bore coaxiality inspection data. Attached Figure Description

[0019] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This is a schematic structural diagram illustrating the existing technology of measuring the coaxiality of compressor housing bearing bores using a feeler gauge; Figure 2 A schematic structural diagram of a compressor housing bearing bore coaxiality inspection structure according to an embodiment of this application; Figure 3 A schematic structural diagram of the first angle of the crossbeam of a compressor body bearing hole coaxiality inspection structure according to an embodiment of this application; Figure 4 A schematic structural diagram of the second angle of the crossbeam of the compressor body bearing hole coaxiality inspection structure according to an embodiment of this application; Figure 5 A schematic flowchart illustrating the steps of a method for inspecting the coaxiality of bearing holes in a compressor body according to an embodiment of this application; in, Figure 1 The correspondence between the reference numerals and component names in the attached drawings is as follows: 1' Tooling tile; 2' Feeler gauge; 3' Bearing housing; 4' Crankshaft; in, Figures 2 to 4 The correspondence between the reference numerals and component names in the attached drawings is as follows: 12. Crankshaft; 14. Bearing housing; 15. Positioning block; 16. Adjusting bracket; 18. Measuring mechanism; 20. Split surface; 22. Crossbeam; 24. Connecting hole; 161. Rotating arm; 162. Hinge mechanism. Detailed Implementation

[0020] 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", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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. Therefore, they should not be construed as limitations on this application.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0022] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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 according to the specific circumstances.

[0023] The preferred embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0024] like Figure 2 As shown, according to a first aspect of the embodiments of this application, a coaxiality inspection structure for a compressor body bearing bore is proposed, comprising: a crankshaft 12, a bearing housing 14, a positioning block 15, an adjusting frame 16, and a measuring mechanism 18; the crankshaft 12 is installed inside the bearing housing 14; the positioning block 15 is disposed on the split surface 20 of the bearing bore in the body, and the positioning block 15 is engaged with the bearing housing 14; the first end of the adjusting frame 16 is connected to the positioning block 15; the measuring mechanism 18 is connected to the second end of the adjusting frame 16, and the measuring head of the measuring mechanism 18 rests against the crankshaft 12.

[0025] The compressor body bearing bore coaxiality inspection structure provided in this application embodiment includes a crankshaft 12, a bearing housing 14, a positioning block 15, an adjusting frame 16, and a measuring mechanism 18. The positioning block 15 is engaged with the split surface 20 of the bearing housing 14 to establish a stable and repeatable installation reference. The adjusting frame 16 adjustably connects the measuring mechanism 18 to the positioning block 15. The crankshaft 12 is installed in the bearing bore. After positioning the center of the crankshaft 12, the measuring head of the measuring mechanism 18 is placed on the diameter surface of the crankshaft 12 to detect the horizontal gap between the surface of the crankshaft 12 on the left and right sides of the center line of the crankshaft 12 and the surface of the bearing bore. The measuring mechanism 18 displays the data to directly measure the horizontal offset of the bearing bore center, thereby detecting the coaxiality of the bearing bore. This eliminates the need for traditional feeler gauges and tooling structures, avoiding inaccurate measurements caused by inconsistent insertion depth of feeler gauges and large human judgment errors. It is especially suitable for the inspection of large compressor bodies that have undergone deformation after long-term operation. The coaxiality inspection structure of this application is simple in design, highly versatile, and easy to operate. It reduces the reliance on special tooling for on-site testing and improves the testing efficiency and data reliability of the coaxiality of the compressor body bearing holes.

[0026] like Figure 2 As shown, in one feasible implementation, the measuring mechanism 18 is a dial indicator.

[0027] In this technical solution, a dial indicator is used as the measuring mechanism 18. The high-precision gear transmission structure and pointer dial of the dial indicator can magnify and display the minute displacements on the surface of the crankshaft 12, replacing the traditional feeler gauge's tactile judgment, so as to objectively read the measurement value and reduce the influence of human experience on the measurement results.

[0028] It should be noted that the dial indicator is calibrated before measurement through the zeroing mechanism. After the dial indicator pointer is adjusted to the "zero position", the adjustment bracket 16 is locked, which further ensures the consistency of multiple measurements and multi-point measurements, thereby providing a reliable and accurate data source for coaxiality evaluation.

[0029] In one possible implementation, the positioning block 15 extends axially along the bearing housing 14.

[0030] In this technical solution, the positioning block 15 extends axially along the bearing housing 14 to form a reference consistent with the axis of the bearing hole. The positioning block 15 uses the machined surface of the machine body itself as the positioning reference to avoid introducing additional errors. At the same time, the longitudinal length of the positioning block 15 increases the contact area and friction with the machine body, improves the stability of the contact between the positioning block 15 and the machine body, reduces the possibility of displacement of the positioning block 15 during the measurement process, and makes the measurement reference more stable and reliable, thereby helping to improve the reliability and effectiveness of the measurement results.

[0031] like Figure 2 value Figure 4 As shown, in one feasible embodiment, the compressor body bearing hole coaxiality inspection structure further includes: a crossbeam 22; the crossbeam 22 is disposed on the bottom surface of the positioning block 15, the crossbeam 22 is disposed parallel to the length direction of the positioning block 15, the crossbeam 22 is located on the side of the positioning block 15 near the crankshaft 12, and the crossbeam 22 is in contact with the hole surface of the bearing hole.

[0032] In this technical solution, a crossbeam 22 is added to one side of the positioning block 15. The crossbeam 22 fits against the inner wall of the bearing hole to limit the positioning block 15. The bottom surface of the positioning block 15 is in close contact with the bearing hole split surface 20 to determine the axial and angular reference of the positioning block 15, making the positioning block 15 parallel to the bearing hole split surface 20. The crossbeam 22 is in close contact with the inner hole surface of the bearing hole to provide the radial reference of the positioning block 15. Thus, through double constraint, the positioning accuracy and repeatability of the entire detection device in the bearing hole are improved, the tendency of the measuring device to rotate or move radially during measurement is reduced, and the stability and positional reliability of the measuring device during measurement are improved.

[0033] In one possible implementation, the first end of the adjustment bracket 16 is connected to the center of the cross-section of the positioning block 15.

[0034] In this technical solution, the connection point of the adjusting frame 16 is set at the center of the cross-section of the positioning block 15, which is conducive to maintaining the overall mechanical balance of the measuring device. When using the measuring device to measure on the left and right sides of the bearing hole, it is only necessary to rotate the positioning block 15 so that the crossbeam 22 is in contact with the hole surface on both sides of the bearing hole, which can ensure that the distance between the adjusting frame 16 and the hole surface on both sides of the bearing hole is the same. The positioning operation is convenient, thereby further improving the measurement efficiency of bearing hole coaxiality.

[0035] In one possible implementation, the adjustment bracket 16 is detachably connected to the positioning block 15.

[0036] In this technical solution, the adjustment frame 16 and the positioning block 15 are detachably connected, realizing the modularity of the measuring device and making it more portable. After using the measuring device in the field, the adjustment frame 16 and the measuring mechanism 18 can be quickly removed from the positioning block 15 for easy carrying and storage; at the same time, it facilitates the replacement and maintenance of components, allowing for the replacement of dial indicators with different ranges or adjustment arms of different lengths, so that a set of basic tools can adapt to a wider range of testing needs, reducing equipment and usage costs.

[0037] like Figure 3 and Figure 4 As shown, in one feasible embodiment, the compressor body bearing hole coaxiality inspection structure further includes: a connecting hole group; the connecting hole group includes a plurality of connecting holes 24, which are equally spaced along the length direction of the positioning block 15 on the axial direction of the positioning block 15.

[0038] In this technical solution, the connecting holes 24, which are equally spaced along the axial direction of the bearing hole, form an adjustable array of connecting points. By changing the connecting points of the adjusting frame 16, equal-spaced measurements can be achieved along the axial direction of the bearing hole. At the same time, the operator can also flexibly select the most suitable connecting hole 24 to connect the adjusting frame 16 according to the diameter of the crankshaft 12 being measured and the specific axial position requirements of the measuring point, so that the measuring head of the measuring mechanism 18 can contact the surface of crankshaft 12 of different specifications with appropriate angle and pressure, thus expanding the applicability of the measuring device.

[0039] like Figure 3 As shown, in one feasible embodiment, the inner wall of the connecting hole 24 is provided with an internal thread, the first end of the adjusting bracket 16 is provided with an external thread, and the adjusting bracket 16 is threadedly connected to one of the connecting holes 24.

[0040] In this technical solution, the adjusting frame 16 and the positioning block 15 are connected by a threaded connection, which allows for the assembly and disassembly of the measuring device without the need for tools. The structure is simple, reliable, and inexpensive. The preload generated by tightening the threads can rigidly lock the adjusting frame 16 and the positioning block 15 together, preventing the connection between the adjusting component and the positioning block 15 from loosening or shaking during the measurement process.

[0041] In some examples, the self-locking and anti-loosening properties of the threads allow for fine-tuning of the height of the adjustment bracket 16, making the operation intuitive and easy to control.

[0042] In one feasible implementation, the spacing between the connecting holes 24 is 18~22mm.

[0043] In this technical solution, the hole spacing of the connecting hole 24 is set to 18~22mm, which can provide a sufficiently fine adjustment gradient to adapt to the measurement requirements of most bearing holes, while avoiding the hole spacing of the connecting hole 24 being too close, which would weaken the local strength of the positioning block 15, and ensure that the connecting hole 24 is not easily deformed or damaged during long-term use of the measuring device.

[0044] As a preferred embodiment, the spacing between the connecting holes 24 is 20mm. like Figure 1 As shown, in one feasible embodiment, the adjustment frame 16 includes three rotating arms 161, which are sequentially rotatably connected by a hinge mechanism 162. The rotating arm 161 at the first end is connected to the positioning block 15, and the rotating arm 161 at the second end is connected to the measuring mechanism 18.

[0045] In this technical solution, each hinge point of the adjustment frame 16 provides a rotational degree of freedom, enabling the measuring mechanism 18 to perform a wide range of positional adjustments in three-dimensional space. Thus, regardless of the angle at which the crankshaft 12 rests within the bearing hole, the operator can bend each rotating arm 161 to make the measuring head of the measuring mechanism 18 precisely press against the surface of the crankshaft 12 to be measured. This allows the measuring device to perform precise measurements in narrow and complex internal spaces of the machine body, improving the accessibility of the measurement and making the operation flexible and efficient.

[0046] In some examples, the hinge structure is a damped hinge shaft, which ensures that the position of the adjusting frame 16 does not change after the measuring mechanism 18 comes into contact with the crankshaft 12, thus ensuring the positional stability of the measuring mechanism 18 during the measurement process and ensuring that the measurement results are valid and reliable.

[0047] like Figure 5 As shown, according to a second aspect of this application, a method for inspecting the coaxiality of bearing bores in a compressor housing is proposed, applicable to the coaxiality inspection structure of bearing bores in a compressor housing as described in any of the above technical solutions, comprising: Step 100: Place the positioning block on the split surface of the bearing hole in the machine body and lock the positioning block onto the bearing seat; Step 200: Adjust the adjustment frame so that the measuring head of the measuring mechanism abuts against the diameter surface of the crankshaft, zero the measuring mechanism, and obtain the first measurement reading; Step 300: Reverse the direction of the positioning block and move it to the split surface on the other side of the bearing hole in the machine body, and lock the positioning block on the bearing seat. Step 400: Place the measuring head against the diameter surface of the crankshaft to obtain a second measurement reading; Step 500: Determine the horizontal offset of the bearing bore center relative to the crankshaft centerline based on the difference between the first and second measurement readings.

[0048] The compressor body bearing hole coaxiality inspection method provided in this application embodiment is applicable to compressor body inspection of various models and specifications. Positioning is achieved through the snap-fit ​​positioning of the locating block with the bearing hole's split surface and inner wall, establishing a stable and repeatable measurement benchmark without relying on special tooling. A dial indicator is used as the measuring mechanism instead of a traditional feeler gauge, directly reading the values ​​and eliminating human error caused by inconsistent feeler gauge insertion depth and differences in tactile judgment. The measurement results are digitized, improving the reliability and repeatability of the inspection data. The adjustment frame has multiple degrees of freedom, enabling rapid adaptation to different crankshaft positions and bore diameters. Assembly, adjustment, and measurement can be completed by a single person, improving on-site inspection efficiency and avoiding the cost and carrying burden of equipping each model with special tooling in traditional inspection methods, thus achieving standardization and universalization of the inspection tools. By performing the detection method of this application in different bearing hole sequences, the offset distribution of each hole position can be obtained quickly and accurately, which facilitates the systematic evaluation of the overall deformation and coaxiality of the machine body, providing a comprehensive basis for equipment management and overhaul decisions. It is particularly suitable for large reciprocating compressors whose coaxiality deteriorates due to foundation settlement and stress deformation after long-term operation. It can be quickly detected without disassembling the crankshaft or main bearing, providing accurate data support for equipment maintenance, calibration and life prediction.

[0049] The compressor body bearing hole coaxiality inspection method provided in this application embodiment is applied to the compressor body bearing hole coaxiality inspection structure of any of the above technical solutions. Therefore, the compressor body bearing hole coaxiality inspection method has all the beneficial effects of the compressor body bearing hole coaxiality inspection structure of the above technical solutions, which will not be elaborated here.

[0050] It will be readily understood by those skilled in the art that the above embodiments can be freely combined and superimposed without conflict.

[0051] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above are merely preferred embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the protection scope of this application.

Claims

1. A structure for inspecting the coaxiality of bearing holes in a compressor body, characterized in that, The structure for checking the coaxiality of the compressor body bearing bores includes: A crankshaft and a bearing housing, wherein the crankshaft is mounted within the bearing housing; A positioning block is provided on the split surface of the bearing hole in the fuselage, and the positioning block is engaged with the bearing seat; An adjusting frame, the first end of which is connected to the positioning block; A measuring mechanism is connected to the second end of the adjusting frame, and the measuring head of the measuring mechanism rests against the crankshaft.

2. The structure for inspecting the coaxiality of bearing holes in a compressor body according to claim 1, characterized in that, The measuring device is a dial indicator.

3. The structure for inspecting the coaxiality of bearing holes in a compressor body according to claim 1, characterized in that, The positioning block extends along the axial direction of the bearing housing.

4. The structure for inspecting the coaxiality of bearing holes in a compressor body according to claim 3, characterized in that, The compressor body bearing bore coaxiality inspection structure also includes: A crossbeam is disposed on the bottom surface of the positioning block. The crossbeam is parallel to the length direction of the positioning block and is located on the side of the positioning block near the crankshaft. The crossbeam is in contact with the hole surface of the bearing hole.

5. The structure for inspecting the coaxiality of bearing holes in a compressor body according to claim 1, characterized in that, The first end of the adjustment frame is connected to the center of the cross-section of the positioning block.

6. The structure for inspecting the coaxiality of bearing holes in a compressor body according to claim 1, characterized in that, The adjusting frame is detachably connected to the positioning block.

7. The structure for inspecting the coaxiality of bearing holes in a compressor body according to claim 6, characterized in that, The compressor body bearing bore coaxiality inspection structure also includes: A connecting hole group, comprising a plurality of connecting holes, wherein the connecting holes are equally spaced along the length direction of the positioning block on the axial direction of the positioning block.

8. The structure for inspecting the coaxiality of bearing holes in a compressor body according to claim 7, characterized in that, The inner wall of the connecting hole is provided with an internal thread, and the first end of the adjusting bracket is provided with an external thread. The adjusting bracket is threadedly connected to one of the connecting holes.

9. A structure for inspecting the coaxiality of bearing holes in a compressor body according to any one of claims 1 to 8, characterized in that, The adjustment frame includes three rotating arms, which are connected in sequence by a hinge mechanism. The rotating arm at the first end is connected to the positioning block, and the rotating arm at the second end is connected to the measuring mechanism.

10. A method for inspecting the coaxiality of bearing holes in a compressor body, characterized in that, An apparatus for inspecting the coaxiality of bearing bores in a compressor housing as described in any one of claims 1 to 9, comprising: Place the positioning block on the split surface of the bearing hole in the fuselage and lock the positioning block onto the bearing seat; Adjust the adjustment frame so that the measuring head of the measuring mechanism abuts against the diameter surface of the crankshaft, zero the measuring mechanism, and obtain the first measurement reading; Reverse the direction of the positioning block and move it to the split surface on the other side of the bearing hole of the machine body, and lock the positioning block on the bearing seat; The measuring head is brought into contact with the diameter surface of the crankshaft to obtain a second measurement reading; The horizontal offset of the bearing bore center relative to the centerline of the crankshaft is determined based on the difference between the first and second measurement readings.

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