A diesel engine main bearing hole coaxial degree measuring system and method

Abstract

A diesel engine main bearing hole coaxiality measurement system comprises a processing terminal, a laser beam emitter and a sensor system, wherein the laser beam emitter is configured to adjust the position of a laser spot on the sensor system according to the instruction issued by the processing terminal, the sensor system is configured to collect the position of the laser spot and deliver the position information of the laser spot to the processing terminal, and the processing terminal is configured to record the position information of the laser spot and calculate the full-length coaxiality and the adjacent coaxiality. The diesel engine main bearing hole coaxiality measurement method of the present application has the advantages that after the angle of the laser beam is adjusted, it is not necessary to adjust again, the more the number of bearing positions is, the more obvious the superiority is; it is not necessary to find the center of the main bearing hole; the coaxiality is displayed more intuitively without derivation and calculation.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of diesel engines, in particular to a diesel engine main bearing hole coaxiality measurement system and method. BACKGROUND

[0002] The diesel engine main bearing hole is used to bear the diesel engine crankshaft, and the crankshaft is a key moving part with complex stress conditions. In an ideal state, the centers of the diesel engine main bearing holes should be on the same straight line to ensure that the surface elements of the bearing holes bearing the crankshaft are on the same straight line, so that the crankshaft is balanced. However, in actual diesel engine main bearing holes, the axes of each main bearing hole are not on the same straight line during processing or maintenance. Therefore, the coaxiality of the diesel engine main bearing hole needs to be measured to ensure that the coaxiality of the newly manufactured and overhauled diesel engine main bearing holes meets the technical requirements.

[0003] Document CN 113916160 A discloses a tracked vehicle chassis multi-hole coaxiality measurement system and method. The measurement system includes an input-output terminal, a double-light-path internal focusing autocollimator, and a high-precision centering device. The double-light-path internal focusing autocollimator is used to emit parallel light test light paths and internal focusing test light paths, and the two test light paths are coaxial. The parallel light path is used to measure the angular error of the hole system, and the internal focusing test light path is used to measure the displacement error of the hole system. The two light paths do not interfere with each other. The high-precision centering device adopts a three-point self-centering structure and is used to receive and reflect the measurement light beam. The high-precision centering device adopts a three-point self-centering structure and is mainly composed of a sensing probe, a synchronous telescopic rod, and a support device. Three synchronous telescopic rods are evenly distributed on the support device, and a sensing probe is installed at the end of each synchronous telescopic rod. A dividing plate is installed on the support device, and the surface of the dividing plate is perpendicular to the mechanical shaft of the centering device. The surface has optical reflection properties and can reflect the parallel measurement light beam emitted by the double-light-path internal focusing autocollimator. The input-output terminal measures the angular deviation of the surface of the dividing plate to obtain the angular deviation value of the centering device coaxiality of the measured hole system. The disadvantages are: the operation is complex, the centering device needs to be adjusted for each hole position to measure the coaxiality, and the double-pipeline system of the autocollimator based on the optical imaging principle gradually decreases the imaging quality as the measurement distance increases.

[0004] Document CN 2283227 Y discloses an engine body main bearing hole coaxiality measuring device, which is composed of a bridge plate mechanism, a coaxiality measuring unit, a positioning unit and a signal processing unit. The coaxiality measuring unit is composed of a displacement sensor for measuring diameter, a displacement sensor for measuring coaxiality and corresponding rotating shafts. The measuring device (except the signal processing unit) is placed in the measured hole, and two supports in the bridge plate mechanism are in contact with the adjacent two measured holes. The displacement sensor for measuring diameter in the coaxiality measuring unit measures the diameter of the first hole, and the displacement sensor for measuring coaxiality in the coaxiality measuring unit measures the deviation of the center of the third hole relative to the line connecting the centers of the previous two holes. Then, the above steps are repeated until the measurement of each main bearing hole of the engine body is completed. Through the data processing unit, the diameter of each hole and the coaxiality of each hole in the full length can be obtained. The disadvantage is that the coaxiality measurement needs to measure the inner diameter of the main bearing hole first, the process is complicated, and the coaxiality needs to be calculated after all measurements, which is not intuitive.

[0005] Currently, there are two ways to measure the coaxiality of the main bearing hole of a diesel engine. One is the self-collimation instrument measurement method based on geometric optical imaging principle, and the other is the over-bridge measurement method using displacement sensors. For diesel engines with a length of up to 5m and 12-position coaxiality of the main bearing hole, the measurement process is complicated and not intuitive. Therefore, a simple, fast and intuitive measurement system and method are needed. SUMMARY

[0006] In view of the deficiencies in the prior art, the purpose of the present application is to provide a diesel engine main bearing hole coaxiality measurement system and method, which does not need to find the center of the main bearing hole and can directly display the coaxiality, thereby solving the problem of measuring the coaxiality of the main bearing hole of a diesel engine.

[0007] To achieve the above purpose, the technical solution provided by the present application is as follows:

[0008] A diesel engine main bearing hole coaxiality measurement system, comprising a processing terminal, a laser beam emitter and a sensor system, wherein the laser beam emitter is configured to adjust the position of the laser spot on the sensor system according to the instructions from the processing terminal, the sensor system is configured to collect the position of the laser spot and transmit the position information of the laser spot to the processing terminal, and the processing terminal is configured to record the position information of the laser spot and calculate the full-length coaxiality and the adjacent coaxiality.

[0009] In some embodiments, the sensor system comprises a sensor module and a sensor support for supporting the sensor module, and the sensor module is movably placed on the sensor support.

[0010] In some embodiments, the sensor support includes a main sensor support and a secondary sensor support which are completely identical, and each of the main sensor support and the secondary sensor support includes a middle annular ring, two bottom feet, two connecting rods and a crossbar, wherein the two bottom feet are connected to the middle annular ring through the connecting rods respectively, and the two ends of the crossbar are connected to the two connecting rods at positions which are at the same distance from the middle annular ring.

[0011] In some embodiments, the center of the annular section of the middle annular ring coincides with the center of the circumscribed circle of the circular section of the bottom feet on the same plane.

[0012] In some embodiments, the sensor module is in a cylindrical shape and includes an image sensor which is arranged on one bottom surface of the sensor module and configured to collect the position of the laser spot emitted by the laser beam emitter.

[0013] In some embodiments, the sensor module includes a wireless signal emitter which is arranged in the sensor module and configured to deliver the laser spot position information to the processing terminal.

[0014] In some embodiments, the sensor module is in an eccentric structure as a whole, and an arrow is arranged in the direction of the gravity center downward, and the direction of the arrow is downward when the sensor module is stopped.

[0015] In some embodiments, the image sensor is a CMOS plane array image sensor in a circular plane, and the laser beam emitter is a laser beam emitter with six-dimensional adjustment function.

[0016] A method for measuring the coaxiality of a diesel engine main bearing hole, using the diesel engine main bearing hole coaxiality measuring system, comprising the following steps:

[0017] Step one: placing the laser beam emitter outside the first main bearing hole of the diesel engine to be measured, the diesel engine to be measured including N main bearing holes, 12

[0018] Step two: placing the main sensor support and the secondary sensor support in the first main bearing hole and the Nth main bearing hole respectively and keeping the positions unchanged, and turning on the processing terminal;

[0019] Step three: placing the sensor module on the main sensor support in the first main bearing hole, turning on the laser beam emitter, generating a laser spot on the sensor module, and recording the first spot position information by the processing terminal after the laser spot is stationary.

[0020] Step four: taking out the sensor module from the main sensor support in the first main bearing hole and placing it on the secondary sensor support in the Nth main bearing hole, and recording the Nth spot position information by the processing terminal after the laser spot is stationary.

[0021] Step five: the processing terminal controls the laser beam emitter to make the laser spot be located at the spot position on the sensor module, and the processing terminal records the Nth spot position information again;

[0022] Step six: the sensor module is taken out from the secondary sensor support in the Nth main bearing hole and placed on the primary sensor support in the first main bearing hole, the processing terminal records the first spot position information again, and checks the same position of the laser passing through the first main bearing hole and the Nth main bearing hole;

[0023] Step seven: the secondary sensor support in the Nth main bearing hole is taken out and placed in the second main bearing hole, the sensor module is taken out from the primary sensor support in the first main bearing hole and placed on the secondary sensor support in the second main bearing hole, and the processing terminal records the second spot position information after the laser spot is stationary;

[0024] Step eight: step seven is repeated, wherein the secondary sensor support is placed in the third main bearing hole to the N-1th main bearing hole in turn, and the processing terminal records the third spot position information to the N-1th spot position information correspondingly;

[0025] Step nine: the processing terminal re-establishes the coordinate system with the first spot position as the origin, and calculates the full-length coaxiality and adjacent coaxiality.

[0026] In some embodiments, in step five, according to the spatial geometric relationship, the processing terminal calculates the laser beam emitter adjustment amount and transmits the laser beam emitter adjustment amount to the laser beam emitter, so as to control the direction of the laser beam emitted by the laser beam emitter, and then make the laser spot be located at the spot position on the sensor module.

[0027] The beneficial effects of the present application are:

[0028] The diesel engine main bearing hole coaxiality measurement system of the present application comprises a sensor system composed of a sensor module and a sensor support, a center of a circle is converted, and a structure for maintaining the sensor module is kept according to the principle of gravity. The resolution of the sensor system can be improved as needed to achieve the required measurement value. The diesel engine main bearing hole coaxiality measurement method of the present application does not need to be adjusted again after adjusting the angle of the laser beam, the more the number of bearings, the more obvious the superiority; the center of the main bearing hole does not need to be found; the coaxiality is more intuitively displayed, without the need for derivation and calculation; the measurement result can be checked or fitted multiple times. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 The figure shows the schematic diagram of the diesel engine main bearing hole coaxiality measurement system of the present application;

[0030] Figure 2Fig. 1 shows a schematic diagram of a sensor system of a diesel engine main bearing hole coaxiality measurement system according to the present application;

[0031] Figure 3 Fig. 2 shows a full-length coaxiality in an embodiment of a diesel engine main bearing hole coaxiality measurement method according to the present application;

[0032] Figure 4 Fig. 3 shows a neighboring coaxiality in an embodiment of a diesel engine main bearing hole coaxiality measurement method according to the present application. DETAILED DESCRIPTION

[0033] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to embodiments and drawings. It should be understood that the specific embodiments described herein are only used to explain the present application and not used to limit the present application.

[0034] There is a gap between the diesel engine crankshaft and the bearing, i.e. the diameter of the crankshaft is smaller than the diameter of the bearing. The bearing surface is the lower half circle in the vertical direction of the main bearing hole. The diameter, roundness and cylindricity of the main bearing hole are the points to be checked. After ensuring that these parameters meet the technical requirements, the measurement of the coaxiality of the main bearing hole only needs to detect the bearing surface half circle. Meanwhile, in the case of the same circle diameter, the offset of the same position relative to the center of the circle is the same as the offset of the center of the main bearing hole, i.e. the center of the circle can be changed to obtain the offset of the center.

[0035] Therefore, the coaxiality of the main bearing hole can be measured by changing the reference point.

[0036] The diesel engine main bearing hole coaxiality measurement system provided by the present application comprises a processing terminal 1, a laser beam emitter 2 and a sensor system 3, as shown in Figs. 1 and 2. Figure 1 and Figure 2 The laser beam emitter 2 is configured to adjust the position of the laser spot on the sensor system 3 according to the instructions issued by the processing terminal 1. The sensor system 3 is configured to collect the position of the laser spot and transmit the position information of the laser spot to the processing terminal 1. The processing terminal 1 is configured to record the position information of the laser spot and calculate the full-length coaxiality and the neighboring coaxiality.

[0037] In some embodiments, the sensor system 3 comprises a sensor module 4 and a sensor support 5 for supporting the sensor module 4. The sensor module 4 is movably placed on the sensor support 5, i.e. the sensor module 4 can be directly placed on the sensor support 5 and directly taken out from the sensor support 5. The sensor module 4 is placed in the main bearing hole 10 of the diesel engine to be measured through the sensor support 5.

[0038] The sensor holder 5 is in two and both of the sensor holders 5 are identical. In order to distinguish, the two sensor holders 5 are called primary sensor holder and secondary sensor holder respectively. Both of the primary sensor holder and the secondary sensor holder comprise a middle ring 6, two bottom feet 7, two connecting rods 8 and a crossbar 9. The two bottom feet 7 are connected to the middle ring 6 by the connecting rods 8 respectively, and the two ends of the crossbar 9 are connected to the two connecting rods 8 at the same distance from the middle ring 6. The middle ring 6, the two bottom feet 7, the two connecting rods 8 and the crossbar 9 can be an integral structure. In the primary sensor holder or the secondary sensor holder, the two bottom feet 7 are identical in structure and are both cylindrical. The cross section of the middle ring 6 and the cross section of the bottom feet 7 are in a plane, and the center of the cross section of the middle ring 6 coincides with the center of the circumscribed circle of the cross section of the bottom feet 7 in the same plane. When the sensor holder 5 is located in the main bearing hole 10, the center of the cross section of the middle ring 6 coincides with the center of the ideal circle of the main bearing hole 10. In some embodiments, both of the sensor holders 5 (i.e. the primary sensor holder and the secondary sensor holder) comprise a middle ring 6, four bottom feet 7, four connecting rods 8 and four crossbars 9. The four bottom feet 7 are connected to the middle ring 6 by the connecting rods 8 respectively and the four bottom feet 7 are symmetrically arranged along the middle ring 6, and the two ends of each of the four crossbars 9 are connected to the two adjacent connecting rods 8 at the same distance from the middle ring 6. Similarly, the center of the cross section of the middle ring 6 coincides with the center of the circumscribed circle of the cross section of the bottom feet 7 in the same plane. When the sensor holder 5 is located in the main bearing hole 10, the center of the cross section of the middle ring 6 coincides with the center of the ideal circle of the main bearing hole 10. In some embodiments, the sensor holder 5 can also take other structures comprising a middle ring 6, wherein the middle ring 6 is located at the center of the sensor holder 5, and when the sensor holder 5 is located in the main bearing hole 10, the center of the cross section of the middle ring 6 coincides with the center of the ideal circle of the main bearing hole 10.

[0039] In some embodiments, the sensor module 4 is in a cylindrical shape, and the sensor module 4 comprises an image sensor (not shown) and a wireless signal transmitter (not shown). The image sensor is arranged on one bottom surface of the sensor module 4 and faces the laser beam emitter 2, and the image sensor is configured to collect the position of the laser spot emitted by the laser beam emitter 2. Preferably, the image sensor can be a circular CMOS (complementary metal-oxide-semiconductor) area image sensor. The wireless signal transmitter is arranged in the sensor module 4 and is configured to transmit the laser spot position information to the processing terminal 1.

[0040] The sensor module 4 is eccentric in structure, and an arrow (not shown) is arranged on the sensor module 4 to indicate the direction of the sensor module 4. The sensor module 4 is placed on the sensor support 5 by being placed in the middle ring 6 of the sensor support 5. Due to the eccentric structure of the sensor module 4, the arrow on the sensor module 4 is always directed downward when the sensor module 4 is stationary, and thus the laser spot position information transmitted to the processing terminal 1 by the wireless signal transmitter is always in the same coordinate system. The gravity principle allows the sensor module 4 to be changed from contact type to rope suspension type.

[0041] The laser beam emitter 2 adjusts the direction of the laser beam according to the instruction from the processing terminal 1, and further adjusts the position of the laser spot on the image sensor of the sensor module 4. The laser beam emitter 2 can be a laser beam emitter with six-dimensional adjustment function.

[0042] The processing terminal 1 receives the laser spot position information from the sensor system 3 and records the laser spot position information. The processing terminal 1 can calculate the adjustment amount of the laser beam emitter 2 and issue an instruction to the laser beam emitter 2 to adjust the direction of the laser beam. The processing terminal 1 automatically calculates the full-length coaxiality and the adjacent coaxiality.

[0043] The diesel engine main bearing hole coaxiality measurement system of the present application is simple to operate, and the more the number of bearing positions, the more obvious the superiority. The sensor system 3 composed of the sensor module 4 and the sensor support 5 converts the center of the circle, and the structure of the sensor module 4 is kept according to the gravity principle. The resolution of the sensor system 3 can be improved as needed to achieve the required measurement value. The error of the laser beam emitter 2 and the sensor system 3 is smaller than that of the optical method.

[0044] The diesel engine main bearing hole coaxiality measurement method of the present application uses the diesel engine main bearing hole coaxiality measurement system of the present application, and the measurement method comprises the following steps:

[0045] Step one: placing the laser beam emitter 2 outside the first main bearing hole of the diesel engine to be measured, the diesel engine to be measured comprising N main bearing holes, 12

[0046] Step two: placing the main sensor support and the secondary sensor support in the first main bearing hole and the Nth main bearing hole respectively and keeping the positions unchanged, and turning on the processing terminal 1;

[0047] Step three: placing the sensor module 4 on the main sensor support in the first main bearing hole, turning on the laser beam emitter 2, generating a laser spot on the sensor module 4, and recording the first spot position information by the processing terminal 1 after the laser spot is stationary.

[0048] Step four: take the sensor module 4 from the primary sensor support in the first primary bearing hole and place it on the secondary sensor support in the Nth primary bearing hole, after the laser spot is stationary, the processing terminal 1 records the Nth spot position information;

[0049] Step five: the processing terminal 1 controls the laser beam emitter 2 to make the laser spot at the spot position on the sensor module 4, and the processing terminal 1 records the Nth spot position information again;

[0050] Step six: take the sensor module 4 from the secondary sensor support in the Nth primary bearing hole and place it on the primary sensor support in the first primary bearing hole, and the processing terminal 1 records the first spot position information again to check that the laser passes through the same position of the first primary bearing hole and the Nth primary bearing hole;

[0051] Step seven: take the secondary sensor support in the Nth primary bearing hole and place it in the second primary bearing hole, and take the sensor module 4 from the primary sensor support in the first primary bearing hole and place it on the secondary sensor support in the second primary bearing hole, after the laser spot is stationary, the processing terminal 1 records the second spot position information;

[0052] Step eight: repeat step seven, wherein the secondary sensor support is placed in the third primary bearing hole to the N-1th primary bearing hole in turn, and the processing terminal 1 records the third spot position information to the N-1th spot position information accordingly;

[0053] Step nine: the processing terminal 1 re-establishes the coordinate system with the first spot position as the origin, and calculates the full-length coaxiality and adjacent coaxiality; the maximum distance between the spot position farthest from the origin and the origin is the full-length coaxiality; and the maximum value of the distance between each two spot positions is the adjacent coaxiality.

[0054] In step five, according to the spatial geometric relationship, the processing terminal 1 calculates the laser beam emitter 2 adjustment amount and transmits the laser beam emitter 2 adjustment amount to the laser beam emitter 2, so as to control the direction of the laser beam emitted by the laser beam emitter 2, and then make the laser spot at the spot position on the sensor module 4.

[0055] The diesel engine primary bearing hole coaxiality measurement method of the application needs two primary bearing holes 10 to determine the center axis, the centers of the two primary bearing holes 10 are the same point in the image, and then the centers of the remaining primary bearing holes are measured, so that at least three primary bearing holes can be measured, and theoretically, an unlimited number of primary bearing holes that can place the sensor system 3 can be measured, that is, N in step one can be unlimited. In some embodiments, the number of primary bearing holes of the diesel engine to be measured is between 3 and 12, that is, N in step one is 12>N>3. The laser spot is used to find the axis of the first primary bearing hole and the last primary bearing hole.

[0056] The method for measuring the coaxiality of the main bearing hole of the diesel engine of the application determines the full-length coaxiality and the adjacent coaxiality by using the laser spot. The method is simple to operate. After the angle of the laser beam is adjusted, the laser spots of the first main bearing hole and the last main bearing hole are overlapped, and there is no need to adjust again. The more the number of bearing positions is, the more obvious the superiority is. The center of the main bearing hole does not need to be found. The coaxiality is more intuitively displayed, and there is no need to derive and calculate. The angle of the sensor support 5 is adjusted to re-measure and check the measurement result or multiple fitting.

[0057] The preferred embodiment of the method for measuring the coaxiality of the main bearing hole of the diesel engine of the application is described by taking a diesel engine with six main bearing holes as an example, and includes the following steps.

[0058] Step one: place the laser beam emitter 2 outside the first main bearing hole of the diesel engine to be measured;

[0059] Step two: place the main sensor support and the secondary sensor support in the first main bearing hole and the sixth main bearing hole respectively and keep the positions unchanged, and turn on the processing terminal 1;

[0060] Step three: place the sensor module 4 on the main sensor support in the first main bearing hole, turn on the laser beam emitter 2, and generate a laser spot on the sensor module 4. After the laser spot is stationary, the position of the laser spot on the sensor module 4 is the spot position, and the processing terminal 1 records the first spot position information;

[0061] Step four: take the sensor module 4 out of the main sensor support in the first main bearing hole and place it on the secondary sensor support in the sixth main bearing hole. After the laser spot is stationary, the processing terminal 1 records the sixth spot position information;

[0062] Step five: according to the spatial geometric relationship, the processing terminal 1 calculates the adjustment amount of the laser beam emitter 2 and transmits the adjustment amount of the laser beam emitter 2 to the laser beam emitter 2, so as to control the direction of the laser beam emitted by the laser beam emitter 2, and then make the laser spot be located at the spot position on the sensor module 4. The processing terminal 1 records the sixth spot position information again;

[0063] Step six: take the sensor module 4 out of the secondary sensor support in the sixth main bearing hole and place it on the main sensor support in the first main bearing hole. The processing terminal 1 records the first spot position information again, and checks whether the laser passes through the same position of the first main bearing hole and the sixth main bearing hole;

[0064] Step seven: the secondary sensor support in the sixth main bearing hole is taken out and placed in the second main bearing hole, the sensor module 4 is taken out from the primary sensor support in the first main bearing hole and placed on the secondary sensor support in the second main bearing hole, after the laser spot is stationary, the processing terminal 1 records the second spot position information;

[0065] Step eight: the step seven is repeated, wherein the secondary sensor support is placed in the third main bearing hole to the fifth main bearing hole in turn, and the processing terminal 1 records the third spot position information to the fifth spot position information correspondingly;

[0066] Step nine: the processing terminal 1 re-establishes the coordinate system with the first spot position as the origin, and calculates the full-length coaxiality and the adjacent coaxiality; the maximum distance between the spot position farthest from the origin and the origin is the full-length coaxiality, as shown in Figure 3 , the full-length coaxiality is S12; the maximum value of the distance between every two spot positions is the adjacent coaxiality, as shown in Figure 4 , the adjacent coaxiality is S23. Wherein Figure 3 and Figure 4 1-6 points in and represent the positions of the first spot position to the sixth spot position in the coordinate system.

[0067] The above-described embodiments only express the implementation of the present application, the description is more specific and detailed, but it cannot be understood as the limitation of the patent scope of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which belong to the protection scope of the present application.

Claims

1. A diesel main bearing bore concentricity measuring system characterized by, The system comprises a processing terminal, a laser beam emitter and a sensor system, wherein the laser beam emitter is configured to adjust the position of a laser spot on the sensor system according to the instructions from the processing terminal, the sensor system is configured to collect the position of the laser spot and deliver the laser spot position information to the processing terminal, the processing terminal is configured to record the laser spot position information, calculate the adjustment amount of the laser beam emitter and issue instructions to the laser beam emitter to adjust the direction of the laser beam and calculate the full-length coaxiality and adjacent coaxiality; The sensor system comprises a sensor module and a sensor support for supporting the sensor module, and the sensor module is movably placed on the sensor support; The sensor module is an eccentric structure as a whole, and an arrow is arranged in the direction of the gravity center downward, and the arrow points downward when the sensor module is stopped; When the sensor support is located in the main bearing hole, the center of the annular section of the middle annular ring coincides with the center of the ideal circle of the main bearing hole; The sensor support comprises a main sensor support and a secondary sensor support which are completely identical, and each of the main sensor support and the secondary sensor support comprises the middle annular ring, two bottom feet, two connecting rods and a crossbar, wherein the two bottom feet are connected to the middle annular ring through the connecting rods respectively, and the crossbar is connected to the two connecting rods at positions which are away from the middle annular ring by the same distance respectively; The center of the annular section of the middle annular ring coincides with the center of the circumscribed circle of the circular section of the bottom feet on the same plane.

2. The diesel main bearing bore concentricity measuring system of claim 1, wherein, The sensor module is in the shape of a cylinder and comprises an image sensor which is arranged on one bottom surface of the sensor module and configured to collect the position of the laser spot emitted by the laser beam emitter.

3. The diesel main bearing bore concentricity measuring system of claim 2, wherein, The sensor module comprises a wireless signal emitter which is arranged in the sensor module and configured to deliver the laser spot position information to the processing terminal.

4. The diesel main bearing bore concentricity measuring system of claim 2, wherein, The image sensor is a circular CMOS area image sensor, and the laser beam emitter is a laser beam emitter with six-dimensional adjustment function.

5. A method of measuring the coaxiality of a main bearing bore of a diesel engine using the system for measuring the coaxiality of a main bearing bore of a diesel engine according to any one of claims 1 to 3, characterized in that, The method comprises the following steps: Step one: placing the laser beam emitter outside the first main bearing hole of a diesel engine to be measured, wherein the diesel engine to be measured comprises N main bearing holes, and 12 Step two: placing the main sensor support and the secondary sensor support in the first main bearing hole and the Nth main bearing hole respectively and keeping the positions unchanged, and then turning on the processing terminal; Step three: placing the sensor module on the main sensor support in the first main bearing hole, turning on the laser beam emitter, generating a laser spot on the sensor module, and recording the first laser spot position information after the laser spot is static, wherein the position of the laser spot on the sensor module is the laser spot position. Step four: repeating steps one to three for the remaining N-1 main bearing holes, and then calculating the full-length coaxiality and adjacent coaxiality of the diesel engine to be measured according to the laser spot position information of the N main bearing holes. Step four: the sensor module is taken out from the main sensor holder in the first main bearing hole and placed on the secondary sensor holder in the Nth main bearing hole, after the laser spot is stationary, the processing terminal records the Nth spot position information; Step five: the processing terminal controls the laser beam emitter, so that the laser spot is located on the spot position on the sensor module, and the processing terminal records the Nth spot position information again; Step six: the sensor module is taken out from the secondary sensor holder in the Nth main bearing hole and placed on the main sensor holder in the first main bearing hole, the processing terminal records the first spot position information again, and checks the same position of the laser passing through the first main bearing hole and the Nth main bearing hole; Step seven: the secondary sensor holder in the Nth main bearing hole is taken out and placed in the second main bearing hole, and the sensor module is taken out from the main sensor holder in the first main bearing hole and placed on the secondary sensor holder in the second main bearing hole, after the laser spot is stationary, the processing terminal records the second spot position information; Step eight: repeat step seven, wherein the secondary sensor holder is placed in the third main bearing hole to the N-1th main bearing hole in turn, and the processing terminal records the third spot position information to the N-1th spot position information accordingly; Step nine: the processing terminal re-establishes the coordinate system with the first spot position as the origin, and calculates the full-length coaxiality and adjacent coaxiality; In the step five, according to the spatial geometric relationship, the processing terminal calculates the laser beam emitter adjustment amount and transmits the laser beam emitter adjustment amount to the laser beam emitter, so as to control the direction of the laser beam emitted by the laser beam emitter, and then make the laser spot located on the spot position on the sensor module.

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