Device and method for measuring the axis trajectory of the crankshaft of a multi-cylinder diesel engine

Abstract

The application relates to the diesel engine technical field, in particular to a kind of multi-cylinder diesel engine crankshaft axis track measuring device and measuring method.The application includes free end frame body, first sensor, flywheel end frame body and second sensor.Free end frame body is fixedly arranged on diesel engine body.First sensor is connected on free end frame body, and first sensor can detect the vertical distance between its detection point and the side wall of crankshaft free end.Flywheel end frame body is fixedly arranged on diesel engine body.Second sensor is connected on flywheel end frame body, and second sensor can detect the vertical distance between its detection point and the side wall of crankshaft flywheel end.The axis motion track of crankshaft free end and the axis motion track of crankshaft flywheel end are determined by the detection data of first sensor and second sensor, so as to judge whether the axis motion track of two ends of crankshaft is consistent and reasonable, thereby timely maintenance can be carried out, damage of crankshaft and bearing bush caused by abnormal operation of crankshaft is prevented, and efficiency is higher.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of diesel engines, and more particularly to a device and method for measuring the axis trajectory of a crankshaft of a multi-cylinder diesel engine. BACKGROUND

[0002] A diesel engine is widely used in various fields due to its excellent thermal efficiency and power performance. The power output of the diesel engine is transmitted to a generator or a gear box through a crankshaft, which is the most important component in the transmission system of the diesel engine. Whether the crankshaft operates normally is crucial for the operation of the entire diesel engine. The multi-cylinder diesel engine has a large number of cylinders and a long crankshaft. When the crankshaft rotates at a high speed, the axis trajectories of the two ends of the crankshaft should be consistent and reasonable. Otherwise, the oil film thickness of the main bearing bushing will be large or small, which will cause wear of the crankshaft and the main bearing bushing, and even a crankshaft fracture failure.

[0003] To solve such failures, the usual practice is to monitor the temperature of the bearing bushing. When the temperature of the bearing bushing exceeds the specified limit, the diesel engine is stopped for detection of the crankshaft and the main bearing bushing. This method is inefficient and cannot determine whether the temperature rise of the bearing bushing is caused by abnormal operation of the crankshaft.

[0004] Therefore, how to solve the problem of low efficiency and inability to determine whether the temperature rise of the bearing bushing is caused by abnormal operation of the crankshaft when detecting whether the axis trajectories of the two ends of the crankshaft are consistent and reasonable is a key technical problem to be solved by those skilled in the art. SUMMARY

[0005] To at least partially overcome the problems in the related art, the purpose of the present application is to provide a device and method for measuring the axis trajectory of a crankshaft of a multi-cylinder diesel engine, which can solve the problem of low efficiency and inability to determine whether the temperature rise of the bearing bushing is caused by abnormal operation of the crankshaft when detecting whether the axis trajectories of the two ends of the crankshaft are consistent and reasonable. The preferred technical solutions in many technical solutions provided by the present application can produce many technical effects, which are described in detail below.

[0006] The present application provides a device for measuring the axis trajectory of a crankshaft of a multi-cylinder diesel engine, comprising:

[0007] A free end frame body is fixedly arranged on the diesel engine body;

[0008] A first sensor is connected to the free end frame body, and the first sensor can detect the vertical distance between the detection point and the side wall of the free end of the crankshaft;

[0009] A flywheel end frame body is fixedly arranged on the diesel engine body;

[0010] The second sensor is connected to the flywheel end frame and can detect the vertical distance between its detection point and the crankshaft flywheel end sidewall.

[0011] Optionally, it also includes:

[0012] The third sensor is connected to the free end frame.

[0013] It can detect the vertical distance between the detection point and the free end face of the crankshaft.

[0014] Optionally, the free-end frame includes:

[0015] The vertical plate is connected at one end to the diesel engine block;

[0016] A horizontal plate is fixedly installed at the second end of the vertical plate, and the horizontal plate is parallel to the end face of the free end of the crankshaft;

[0017] A first bracket is connected to the horizontal plate, the first bracket is parallel to the free end of the crankshaft, and the first sensor is vertically mounted on the first bracket.

[0018] Optionally, the free-end frame further includes:

[0019] An adjusting flange is connected to the horizontal plate. The adjusting flange is parallel to the free end of the crankshaft. Multiple first mounting holes are provided on the adjusting flange along the circumferential direction.

[0020] An arc-shaped plate, wherein the first bracket is connected to the arc-shaped plate, and a second mounting hole is provided on the arc-shaped plate, the second mounting hole being alignable with the first mounting hole.

[0021] Optionally, at least two first sensors are provided, the number of first brackets is the same as the number of first sensors, and the two first sensors are perpendicular to each other.

[0022] Optionally, the free-end frame further includes:

[0023] The second frame is mounted on the arc-shaped plate, and the second frame is parallel to the end face of the free end of the crankshaft. The third sensor is vertically mounted on the arc-shaped plate.

[0024] Optionally, the flywheel end frame includes:

[0025] A ring frame is fixedly mounted on the diesel engine block, and the ring frame is located on the periphery of the crankshaft flywheel end. The second sensor is mounted on the ring frame.

[0026] Optionally, at least two third sensors are provided, with the two second sensors perpendicular to each other.

[0027] Optionally, it also includes:

[0028] The data acquisition module is connected to the signals of the first sensor, the second sensor, and the third sensor, respectively.

[0029] The processing terminal is connected to the data acquisition module via a signal.

[0030] A method for measuring the crankshaft centerline trajectory of a multi-cylinder diesel engine, comprising:

[0031] The first sensor is used to detect the vertical distance between its detection point and the sidewall of the free end of the crankshaft.

[0032] The second sensor is used to detect the vertical distance between its detection point and the sidewall of the crankshaft flywheel end;

[0033] A third sensor is used to detect the vertical distance between its detection point and the free end face of the crankshaft.

[0034] By analyzing the detection data from the first, second, and third sensors, the radial and axial offsets of the crankshaft are obtained.

[0035] The crankshaft axis trajectory is determined by the radial and axial offsets of the crankshaft.

[0036] The technical solution provided in this application may include the following beneficial effects:

[0037] By using detection data from the first and second sensors, the axial motion trajectory of the crankshaft's free end and the crankshaft's flywheel end are determined, thereby judging whether the axial motion trajectories at both ends of the crankshaft are consistent and reasonable. This allows for timely maintenance, preventing damage to the crankshaft and bearings caused by abnormal crankshaft operation, resulting in higher efficiency.

[0038] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0039] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0040] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1This is a schematic diagram of the connection structure of a measuring device for measuring the crankshaft centerline trajectory of a multi-cylinder diesel engine, according to some exemplary embodiments.

[0042] Figure 2 This is a schematic diagram of the crankshaft free end structure of a measuring device for measuring the crankshaft axis trajectory of a multi-cylinder diesel engine, according to some exemplary embodiments.

[0043] Figure 3 This is a schematic diagram of the structure of the second frame and the third sensor of a measuring device for the crankshaft centerline trajectory of a multi-cylinder diesel engine, according to some exemplary embodiments.

[0044] Figure 4 This is a schematic diagram of the crankshaft flywheel end structure of a measuring device for measuring the crankshaft axis trajectory of a multi-cylinder diesel engine, according to some exemplary embodiments.

[0045] In the diagram: 1. Free end frame; 2. First sensor; 3. Flywheel end frame; 4. Second sensor; 5. Third sensor; 6. First mounting hole; 7. Second mounting hole; 8. Data acquisition module; 9. Processing terminal; 10. Third mounting hole; 11. Vertical plate; 12. Horizontal plate; 13. First bracket; 14. Adjusting flange; 15. Arc plate; 16. Second frame; 17. Fourth mounting hole. Detailed Implementation

[0046] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses or methods consistent with some aspects of this application.

[0047] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0048] Hereinafter, embodiments will be described with reference to the accompanying drawings. Furthermore, the embodiments shown below do not limit the scope of the invention as described in the claims. Additionally, the complete contents of the configurations represented in the embodiments below are not limited to those necessary for the solution of the invention described in the claims.

[0049] refer to Figures 1-4This specific embodiment provides a measuring device for the crankshaft center trajectory of a multi-cylinder diesel engine, including: a free end frame 1, a first sensor 2, a flywheel end frame 3, and a second sensor 4.

[0050] The free end frame 1 is fixedly mounted on the diesel engine block, located on the periphery of the crankshaft's free end. A first sensor 2 is connected to the free end frame 1, with its length perpendicular to the sidewall of the crankshaft's free end. This allows the first sensor 2 to detect the vertical distance between its detection point and the sidewall of the crankshaft's free end in real time. When the crankshaft rotates, if the axis of the crankshaft's free end shifts radially, the vertical distance between the detection point of the first sensor 2 and the sidewall of the crankshaft's free end will change.

[0051] The flywheel end bracket 3 is fixedly mounted on the diesel engine block, located on the periphery of the crankshaft flywheel end. A second sensor 4 is connected to the flywheel end bracket 3, with its length perpendicular to the sidewall of the crankshaft flywheel end. This allows the second sensor 4 to detect the vertical distance between its detection point and the sidewall of the crankshaft flywheel end in real time.

[0052] When the crankshaft rotates, if the axis of the free end of the crankshaft shifts radially, the vertical distance between the detection point of the first sensor 2 and the sidewall of the free end of the crankshaft changes. If the axis of the flywheel end of the crankshaft shifts radially, the vertical distance between the detection point of the second sensor 4 and the sidewall of the flywheel end of the crankshaft changes. Thus, by using the detection data from the first sensor 2 and the second sensor 4, the axis motion trajectory of the free end of the crankshaft and the axis motion trajectory of the flywheel end of the crankshaft can be determined respectively, thereby judging whether the axis motion trajectories at both ends of the crankshaft are consistent and reasonable. This allows for timely maintenance, preventing damage to the crankshaft and bearings caused by abnormal crankshaft operation, resulting in higher efficiency.

[0053] As an optional embodiment, the measuring device further includes a third sensor 5. The third sensor 5 is connected to the free end bracket 1, and its longitudinal direction is perpendicular to the end face of the free end of the crankshaft. Thus, the third sensor 5 can detect the vertical distance between its detection point and the end face of the free end of the crankshaft in real time.

[0054] When the crankshaft rotates, if it experiences axial displacement, the vertical distance between the detection point of the third sensor 5 and the free end face of the crankshaft will change. Thus, the axial movement trajectory of the crankshaft can be determined using the detection data from the third sensor 5, thereby judging whether the axial displacement during crankshaft rotation is reasonable. This allows for timely maintenance, preventing damage to the crankshaft and bearings caused by abnormal crankshaft operation.

[0055] Regarding the specific configuration of the free end frame 1, in some embodiments, the free end frame 1 includes: a vertical plate 11, a horizontal plate 12, and a first support 13. The vertical plate 11 has a first end and a second end. The two ends of the horizontal plate 12 are respectively connected to the second end of one of the vertical plates 11 to form a U-shape. The first ends of the two vertical plates 11 are fixed to the diesel engine block, so that the two vertical plates 11 are located on both sides of the free end of the crankshaft. At this time, the horizontal plate 12 is parallel to the end face of the free end of the crankshaft.

[0056] One end of the first bracket 13 is connected to the horizontal plate 12, so that the first bracket 13 is parallel to the free end of the crankshaft. The first sensor 2 is vertically set on the first bracket 13, so that the length direction of the first sensor 2 is perpendicular to the side wall of the free end of the crankshaft.

[0057] In some embodiments, the free end frame 1 further includes an adjusting flange 14 and an arc-shaped plate 15. One end of the first bracket 13 is connected to and perpendicular to the arc-shaped plate 15.

[0058] A third mounting hole 10 is made on the adjusting flange 14, and a fourth mounting hole 17 is made on the horizontal plate 12. After aligning the third mounting hole 10 and the fourth mounting hole 17, bolts are passed through and fixed, thereby fixing the adjusting flange 14 on the horizontal plate 12.

[0059] Multiple first mounting holes 6 are provided on the adjusting flange 14 along its circumference. At least two second mounting holes 7 are provided on the arc-shaped plate 15. After aligning one second mounting hole 7 with one first mounting hole 6, the other second mounting holes 7 can be aligned with one first mounting hole 6 respectively. At this time, the arc-shaped plate 15 can be fixed to the adjusting flange 14 by passing bolts through it. That is, the first bracket 13 is connected to the horizontal plate 12 in sequence through the arc-shaped plate 15 and the adjusting flange 14.

[0060] When it is necessary to adjust the position of the first bracket 13 on the adjusting flange 14, remove the bolts that pass through the first mounting holes 6, adjust the position of the arc plate 15 so that each second mounting hole 7 is aligned with another first mounting hole 6, and then re-pass the bolts through the second mounting holes 7 and the first mounting holes 6 to complete the installation. At this time, the arc plate 15 is moved a certain position along the circumference of the adjusting flange 14.

[0061] In some embodiments, at least two first sensors 2 are provided. Correspondingly, the number of first supports 13 is the same as the number of first sensors 2, that is, each first sensor 2 is mounted on one first support 13. One end of each first support 13 is vertically connected to the arc-shaped plate 15. Thus, each first sensor 2 is perpendicular to the side wall of the crankshaft free end at different angles. With this arrangement, detection is performed from different positions on the crankshaft free end, allowing for more precise control of the axial motion trajectory of the crankshaft free end.

[0062] Two of the first sensors 2 can be perpendicular to each other. In this way, by setting one of the first sensors 2 vertically along the side wall of the free end of the crankshaft, it is possible to detect not only the vertical offset of the crankshaft free end axis, but also the lateral offset of the crankshaft free end axis.

[0063] Regarding the setting of the third sensor 5, the free end frame 1 also includes a second frame 16. One end of the second frame 16 is connected to the inner side of the arc plate 15. After the arc plate 15 is fixed to the adjusting flange 14, the second frame 16 is parallel to the end face of the free end of the crankshaft. The third sensor 5 is vertically set on the arc plate 15, so that the third sensor 5 is perpendicular to the end face of the free end of the crankshaft.

[0064] Regarding the specific structure of the flywheel end frame 3, the flywheel end frame 3 includes: an annular frame. After the annular frame is fixedly installed on the diesel engine body, the annular frame is located on the periphery of the crankshaft flywheel end. The third sensor 5 is vertically installed on the side wall of the annular frame. At this time, the second sensor 4 is perpendicular to the side wall of the crankshaft flywheel end.

[0065] In some embodiments, at least two second sensors 4 are provided, and all second sensors 4 are perpendicular to the sidewall of the crankshaft flywheel end. This arrangement allows for more precise control of the axial motion trajectory of the crankshaft flywheel end by detecting from different positions on the sidewall of the crankshaft flywheel end.

[0066] Two of the second sensors 4 can be perpendicular to each other. In this way, by setting one of the first sensors 2 vertically along the side wall of the crankshaft flywheel end, it is possible to detect not only the vertical offset of the crankshaft flywheel end axis, but also the lateral offset of the crankshaft flywheel end axis.

[0067] Regarding data processing, the measuring device further includes a data acquisition module 8 and a processing terminal. The first sensor 2, the second sensor 4, and the third sensor 5 can be eddy current sensors. The data acquisition module 8 can be a dedicated control module for eddy current sensors. The processing terminal can be a computer. The data acquisition module 8 is connected to the first sensor 2, the second sensor 4, and the third sensor 5 respectively. The processing terminal 9 is connected to the data acquisition module 8. The data detected by the first sensor 2, the second sensor 4, and the third sensor 5 is collected and processed by the data acquisition module 8 and then sent to the processing terminal 9 for further processing.

[0068] This specific embodiment provides a method for measuring the crankshaft centerline trajectory of a multi-cylinder diesel engine, characterized by including: using a first sensor 2 to detect the vertical distance between its detection point and the side wall of the free end of the crankshaft; using a second sensor 4 to detect the vertical distance between its detection point and the side wall of the flywheel end of the crankshaft; and using a third sensor 5 to detect the vertical distance between its detection point and the end face of the free end of the crankshaft.

[0069] When the crankshaft rotates, if it experiences axial displacement, the perpendicular distance between the detection point of the third sensor 5 and the free end face of the crankshaft changes. Thus, the axial motion trajectory of the crankshaft can be determined using the detection data from the third sensor 5, thereby judging whether the axial displacement during crankshaft rotation is reasonable. By analyzing the detection data from the first sensor 2, the second sensor 4, and the third sensor 5, the radial and axial displacements of the crankshaft are obtained; the crankshaft axis trajectory is determined using these radial and axial displacements. This allows for timely maintenance, preventing damage to the crankshaft and bearings caused by abnormal crankshaft operation.

[0070] It should be noted that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., used herein to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing the invention 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 the invention. Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0071] In the description herein, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0072] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

[0073] It is understood that the same or similar parts in the above embodiments can be referred to each other, and the content not described in detail in some embodiments can be referred to the same or similar content in other embodiments. The multiple solutions provided in this application contain their own basic solutions, are independent of each other, and do not restrict each other, but they can also be combined with each other without conflict to achieve multiple effects.

[0074] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A measuring device for the crankshaft centerline trajectory of a multi-cylinder diesel engine, characterized in that, include: The free end frame is fixedly mounted on the diesel engine block; A first sensor is connected to the free end frame, and the first sensor can detect the vertical distance between its detection point and the side wall of the free end of the crankshaft. The flywheel end frame is fixedly mounted on the diesel engine block. The second sensor is connected to the flywheel end frame and can detect the vertical distance between its detection point and the side wall of the crankshaft flywheel end. The third sensor is connected to the free end frame and can detect the vertical distance between its detection point and the end face of the free end of the crankshaft.

2. The measuring device for the crankshaft centerline trajectory of a multi-cylinder diesel engine according to claim 1, characterized in that, The free-end frame includes: The vertical plate is connected at one end to the diesel engine block; A horizontal plate is fixedly installed at the second end of the vertical plate, and the horizontal plate is parallel to the end face of the free end of the crankshaft; A first bracket is connected to the horizontal plate, the first bracket is parallel to the free end of the crankshaft, and the first sensor is vertically mounted on the first bracket.

3. The measuring device for the crankshaft centerline trajectory of a multi-cylinder diesel engine according to claim 2, characterized in that, The free-end frame also includes: An adjusting flange is connected to the horizontal plate. The adjusting flange is parallel to the free end of the crankshaft. Multiple first mounting holes are provided on the adjusting flange along the circumferential direction. An arc-shaped plate, wherein the first bracket is connected to the arc-shaped plate, and the arc-shaped plate is provided with a second mounting hole that can be aligned with the first mounting hole.

4. The measuring device for the crankshaft centerline trajectory of a multi-cylinder diesel engine according to claim 3, characterized in that, At least two first sensors are provided, and the number of first brackets is the same as the number of first sensors. The two first sensors are perpendicular to each other.

5. The measuring device for the crankshaft centerline trajectory of a multi-cylinder diesel engine according to claim 3, characterized in that, The free-end frame also includes: The second frame is mounted on the arc-shaped plate, and the second frame is parallel to the end face of the free end of the crankshaft. The third sensor is mounted vertically on the arc-shaped plate.

6. The measuring device for the crankshaft centerline trajectory of a multi-cylinder diesel engine according to claim 1, characterized in that, The flywheel end frame includes: A ring frame is fixedly mounted on the diesel engine block, located around the crankshaft flywheel end, and the second sensor is mounted on the ring frame.

7. The measuring device for the crankshaft centerline trajectory of a multi-cylinder diesel engine according to claim 6, characterized in that, At least two second sensors are provided, and the two second sensors are perpendicular to each other.

8. The measuring device for the crankshaft centerline trajectory of a multi-cylinder diesel engine according to claim 1, characterized in that, Also includes: The data acquisition module is connected to the signals of the first sensor, the second sensor, and the third sensor, respectively. The processing terminal is connected to the data acquisition module via a signal.

9. A method for measuring the crankshaft centerline trajectory of a multi-cylinder diesel engine, applied to the measuring device for the crankshaft centerline trajectory of a multi-cylinder diesel engine as described in any one of claims 1-8, characterized in that, include: The first sensor is used to detect the vertical distance between its detection point and the sidewall of the free end of the crankshaft. The second sensor is used to detect the vertical distance between its detection point and the sidewall of the crankshaft flywheel end; A third sensor is used to detect the vertical distance between its detection point and the free end face of the crankshaft. By analyzing the detection data from the first, second, and third sensors, the radial and axial offsets of the crankshaft are obtained. The crankshaft axis trajectory is determined by the radial and axial offsets of the crankshaft.

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