Generator set noise monitoring system

Abstract

A generator set noise monitoring system disclosed by the present invention comprises a detection mechanism, a fixing mechanism and a sensing mechanism, the monitoring mechanism comprises a monitoring box and a positioning column, the positioning column is arranged at the bottom of the monitoring box, the side wall of the monitoring box is provided with a noise hole, and the noise hole communicates the inside and the outside of the monitoring box. The fixing mechanism comprises a mounting plate and connecting plates, positioning holes corresponding to the positioning columns are formed in the mounting plate, the two ends of the mounting plate are connected with the connecting plates in a pivoted mode respectively, and connecting holes are formed in the connecting plates and used for being fixed to the generator set. The sensing mechanism comprises a noise sensor, a PLC processor and a signal transmitter, and the noise sensor, the PLC processor and the signal transmitter are electrically connected with one another. The generator set noise monitoring system provided by the invention has the advantages of real-time noise monitoring, convenient maintenance and wide application range.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of noise monitoring, in particular to a generator set noise monitoring system. BACKGROUND

[0002] At present, the vibration of internal mechanical parts, the swing of the rotor and the pressure pulsation of the fluid system of the generator set during operation will be caused by component collision, air flow disturbance or electromagnetic coupling. The noise characteristics generated during the operation of the generator set are closely related to the working state of the equipment. The normally operating generator set will produce regular mechanical noise, and the frequency, intensity and spectral characteristics of the noise of the generator set will change significantly when the generator set has faults such as bearing wear, component loosening or poor lubrication. Therefore, it is necessary to monitor the noise of the generator set. SUMMARY

[0003] The present application is based on the discovery and understanding of the inventors of the following facts and problems: the present application aims to at least solve one of the technical problems in the related art. To this end, an embodiment of the present application proposes a generator set noise monitoring system, which has the advantages of adaptability to windy weather, convenient operation and high reliability.

[0004] The generator set noise monitoring system according to an embodiment of the present application comprises a detection mechanism, a fixing mechanism and a sensing mechanism, the detection mechanism comprises a detection box and a positioning column, the positioning column is arranged at the bottom of the detection box, the side wall of the detection box is provided with a noise hole, the noise hole communicates the inside and outside of the detection box, the fixing mechanism comprises a mounting plate and a connecting plate, the mounting plate is provided with a positioning hole corresponding to the positioning column, the two ends of the mounting plate are respectively pivotally connected with one of the connecting plates, the connecting plate is provided with a connecting hole for fixing with the generator set, the sensing mechanism comprises a noise sensor, a PLC processor and a signal transmitter, the noise sensor, the PLC processor and the signal transmitter are electrically connected with each other.

[0005] The generator set noise monitoring system according to an embodiment of the present application has the advantages of real-time noise monitoring, convenient maintenance and wide application range. In some embodiments, the fixing mechanism further comprises a rack and a half gear, the mounting plate has a mounting cavity, the positioning column enters the mounting cavity through the positioning hole, the side wall of the mounting plate is provided with an opening, the rack enters the mounting cavity through the opening, the half gear is arranged in the mounting cavity and is pivotally connected with the mounting plate, the half gear can be engaged with the rack, and an annular groove is arranged on the side wall of the positioning column, the half gear can be rotated into the annular groove to limit the axial movement of the positioning column.

[0006] In some embodiments, the first side circumferential surface of the half gear is provided with teeth, the teeth of the first side circumferential surface of the half gear are engaged with the rack, and the second side circumferential surface of the half gear is matched with the annular groove.

[0007] In some embodiments, the second side circumferential surface of the half gear is provided with a disengagement groove, the radius of the disengagement groove is the same as the radius of the positioning hole, and the center of the disengagement groove coincides with the projection of the center of the positioning hole on the horizontal plane.

[0008] In some embodiments, the generator set noise monitoring system further comprises a limiting structure, the limiting structure comprises a fixed block, a limiting column and a spring, the fixed block is arranged in the mounting cavity and located beside the rack, the fixed block is provided with a sliding hole adjacent to one end of the rack, a first limiting hole is correspondingly provided on the side wall of the rack, the first end of the limiting column enters the sliding hole and moves relative to the fixed block, and the spring is located in the sliding hole and the two ends of the spring are connected with the limiting column and the fixed block respectively.

[0009] In some embodiments, the rack is provided with a second limiting hole, the second limiting hole is spaced apart from the first limiting hole and located on the same side of the rack, and the second limiting hole is located on the side of the first limiting hole adjacent to the mounting cavity.

[0010] In some embodiments, the second end of the limiting column is a hemispherical surface to reduce friction.

[0011] In some embodiments, when the first end of the rack is located in the mounting cavity, the second end of the rack protrudes from the side wall of the mounting plate.

[0012] In some embodiments, the monitoring mechanism further comprises a baffle, the baffle is slidably connected with the monitoring box to block the noise hole.

[0013] In some embodiments, the monitoring box is hinged with a box cover at the box opening, the length direction of the box cover is parallel to the length direction of the monitoring box, the side of the box cover away from the hinged end is detachably connected with the edge of the box opening of the monitoring box through a buckle, and the box opening of the monitoring box is closed when the box cover is closed. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 FIG. 1 is a structural schematic diagram of a generator set noise monitoring system according to an embodiment of the present application.

[0015] Figure 2 FIG. 2 is an exploded schematic diagram of a generator set noise monitoring system according to an embodiment of the present application.

[0016] Figure 3is a cross-sectional view of a mounting plate of a generator set noise monitoring system according to an embodiment of the present application.

[0017] Reference numerals: 1, monitoring mechanism; 11, monitoring box; 111, box cover; 112, noise hole; 12, positioning column; 121, annular groove;

[0018] 2, fixing mechanism; 21, mounting plate; 22, connecting plate; 23, positioning hole; 24, mounting cavity; 25, rack; 26, half gear; 261, disengagement groove;

[0019] 3, limiting structure; 31, fixed block; 311, sliding hole; 32, limiting column; 33, first limiting hole; 34, second limiting hole;

[0020] 4, noise sensor; 5, PLC processor; 6, signal transmitter. DETAILED DESCRIPTION

[0021] Embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0022] The generator set noise monitoring system according to the embodiment of the present application comprises a detection mechanism, a fixing mechanism 2 and a sensing mechanism, the monitoring mechanism 1 comprises a monitoring box 11 and a positioning column 12, the positioning column 12 is arranged at the bottom of the monitoring box 11, the side wall of the monitoring box 11 is provided with a noise hole 112, the noise hole 112 communicates the inside and outside of the monitoring box 11, the fixing mechanism 2 comprises a mounting plate 21 and a connecting plate 22, the mounting plate 21 is provided with a positioning hole 23 corresponding to the positioning column 12, both ends of the mounting plate 21 are respectively pivotally connected with one connecting plate 22, the connecting plate 22 is provided with a connecting hole for being fixed with the generator set, the sensing mechanism comprises a noise sensor 4, a PLC processor 5 and a signal transmitter, the noise sensor 4, the PLC processor 5 and the signal transmitter are electrically connected with each other.

[0023] The monitoring box 11 of the monitoring mechanism 1 is used to accommodate the noise sensor 4, the PLC processor 5 and the signal transmitter of the sensing mechanism. The monitoring box 11 can protect the internal equipment from the external harsh environment (such as dust, rain, high temperature, etc.), prolong the service life of the noise sensor 4 and other equipment, provide a relatively stable internal environment for the noise sensor 4, reduce external interference factors, and improve the accuracy of monitoring data. The positioning column 12 fixedly connected at the bottom of the monitoring box 11 is used to cooperate with the mounting plate 21 to realize the quick and accurate positioning and fixing of the monitoring box 11. The noise holes 112 are arranged on the side wall of the monitoring box 11 and communicate the inside and outside of the monitoring box 11, which are used to let the noise enter the inside of the monitoring box 11 for the noise sensor 4 to detect. The arrangement position and number of the noise holes 112 determine the collection direction of the noise, and the specific arrangement of the noise holes 112 is arranged according to the monitoring needs.

[0024] The mounting plate 21 of the fixing mechanism 2 provides support for the monitoring box 11. The positioning column 12 can bear a certain weight and pressure. The mounting plate 21 and the positioning column 12 cooperate to provide stable support for the monitoring box 11, so that it remains stable during the operation of the generator set. The pivotable connection mode of the mounting plate 21 and the connecting plate 22 enables the monitoring box 11 to be flexibly adjusted according to the actual installation position and angle of the generator set, ensuring the best monitoring effect. The connecting plate 22 enables the fixing mechanism 2 to be firmly connected with the generator set, ensuring that the entire monitoring system remains stable during the operation of the generator set and will not loosen due to vibration or impact. The rotating connection of the connecting plate 22 and the mounting plate 21 can be adjusted to adapt to different installation positions of different generator sets.

[0025] The noise sensor 4 of the sensing mechanism detects the noise intensity and frequency generated by the generator set, providing reliable data for subsequent noise analysis and processing. By monitoring the noise changes in real time, noise abnormalities can be found in time, providing a basis for fault diagnosis and maintenance of the generator set. The PLC processor 5 can process and analyze noise data and alarm or process according to the preset threshold or rules. The signal transmitter is used to send noise data, alarm signals and the like to a remote monitoring terminal, which can store noise data and remind workers to take corresponding measures.

[0026] In some embodiments, the fixing mechanism 2 further includes a rack 25 and a half gear 26. The mounting plate 21 has a mounting cavity 24. The positioning column 12 enters the mounting cavity 24 through the positioning hole 23. The side wall of the mounting plate 21 is provided with an opening. The rack 25 enters the mounting cavity 24 through the opening. The half gear 26 is arranged in the mounting cavity 24 and is pivotably connected with the mounting plate 21. The half gear 26 can be engaged with the rack 25. The side wall of the positioning column 12 is provided with an annular groove 121. The half gear 26 can rotate into the annular groove 121 to limit the axial movement of the positioning column 12.

[0027] Specifically, the rack 25 is provided with teeth arranged at equal intervals on both sides of the width direction of the rack 25, and the teeth of the rack 25 are engaged with the teeth of the half gear 26. The position of the positioning column 12 can be accurately controlled through the engagement of the rack 25 and the half gear 26. The movement of the rack 25 drives the half gear 26 to rotate, and the rotation of the half gear 26 can make the toothless part of the half gear 26 enter the annular groove 121 of the positioning column 12, thereby firmly fixing the positioning column 12 in the mounting cavity 24. The half gear 26 is toothed only on a part of the circumferential surface, and as the half gear 26 rotates, the half gear 26 enters the annular groove 121 of the positioning column 12 to achieve the locking of the half gear 26 to the positioning column 12. The thickness of the half gear 26 matches the annular groove 121, and as the rack 25 moves, the rack 25 drives the half gear 26 to rotate relative to the positioning column 12, thereby completing the locking and unlocking of the positioning column 12.

[0028] The teeth of the rack 25 are arranged in the middle of the rack 25, and after the end of the rack 25 enters the mounting cavity 24 by a certain length, the teeth of the rack 25 begin to engage with the teeth of the half gear 26. As the rack 25 continues to move, the half gear 26 begins to rotate, and the toothless part of the half gear 26 enters the annular groove 121 of the positioning column 12. When unlocking is needed, the rack 25 is pulled out, and as the rack 25 moves, the rack 25 drives the half gear 26 to rotate in the opposite direction, and the half gear 26 disengages from the annular groove 121, thereby completing the unlocking, and the positioning column 12 can leave the mounting cavity 24.

[0029] In some embodiments, the first side circumferential surface of the half gear 26 is provided with teeth, the teeth of the first side circumferential surface of the half gear 26 are engaged with the rack 25, and the second side circumferential surface of the half gear 26 is matched with the annular groove 121.

[0030] Specifically, the half gear 26 is divided into two sides, the first side is provided with a plurality of teeth for cooperating with the rack 25, and the second side is matched with the annular groove 121 of the positioning column 12. The half gear 26 is divided into two sides to ensure the number of teeth cooperating with the rack 25 and to ensure that the half gear 26 has sufficient circumferential surface matched with the annular groove 121. The half gear 26 has teeth on only one side, which makes the entire fixing mechanism 2 more compact and saves space.

[0031] In some embodiments, the second side circumferential surface of the half gear 26 is provided with a disengaging groove 261, the radius of the disengaging groove 261 is the same as the radius of the positioning hole 23, and the center of the disengaging groove 261 coincides with the projection of the center of the positioning hole 23 on the horizontal plane.

[0032] Specifically, the radius of the disengaging groove 261 is the same as the radius of the positioning hole 23, which facilitates the cooperation of the disengaging groove 261 with the positioning column 12, and the center of the disengaging groove 261 coincides with the projection of the center of the positioning hole 23 on the horizontal plane, so that when the half gear 26 is turned to a certain position, the disengaging groove 261 can be aligned with the positioning hole 23, allowing the positioning column 12 to move in the positioning hole 23.

[0033] Optionally, a torque sensor is arranged on the rotating shaft of the half gear 26, which is used to detect the resistance when the half gear 26 rotates. When the resistance is greater than a preset range, it indicates that the cooperation between the positioning column 12 and the half gear 26 is wrong, and manual intervention is needed for adjustment.

[0034] In some embodiments, the generator set noise monitoring system further comprises a limiting structure 3, which comprises a fixed block 31, a limiting column 32 and a spring. The fixed block 31 is arranged in the installation cavity 24 and located beside the rack 25. The fixed block 31 is provided with a sliding hole 311 adjacent to one end of the rack 25. Correspondingly, a first limiting hole 33 is arranged on the side wall of the rack 25. The first end of the limiting column 32 enters the sliding hole 311 and moves relative to the fixed block 31. The spring is located in the sliding hole 311 and the two ends of the spring are connected with the limiting column 32 and the fixed block 31 respectively.

[0035] Specifically, the arrangement of the fixed block 31 beside the rack 25 can play a supporting and positioning role. A part of the limiting column 32 slides in the fixed block 31, and the other part of the limiting column 32 can enter the rack 25 to realize limitation. The spring provides elastic force, so that the limiting column 32 can maintain a certain pressure in the sliding hole 311, ensuring that the limiting column 32 tightly cooperates with the limiting hole on the rack 25. When the limiting column 32 enters the first limiting hole 33, the movement of the rack 25 is limited, thereby ensuring the stability of the rack 25 at the set position and effectively preventing the rack 25 from moving accidentally due to external force or vibration, thereby improving the reliability of the system. On the one hand, the spring provides elastic buffer so that the limiting column 32 can adapt to a certain position deviation, and on the other hand, it can ensure that the limiting column 32 enters the limiting hole under the push of the spring.

[0036] Optionally, a rubber block is arranged at the end of the limiting column 32 to reduce the collision between the limiting column 32 and the limiting hole and protect the limiting column 32.

[0037] In some embodiments, a second limiting hole 34 is arranged on the rack 25, which is spaced a certain distance from the first limiting hole 33 and located on the same side of the rack 25. The second limiting hole 34 is located on the side of the first limiting hole 33 adjacent to the installation cavity 24.

[0038] Specifically, the second limiting hole 34 is closer to the inside of the installation cavity 24 than the first limiting hole 33, which means that the second limiting hole 34 can cooperate with the limiting column 32 to complete the limiting earlier. At this time, the teeth of the rack 25 have not yet contacted the half gear 26, and the second limiting hole 34 increases the limiting position of the rack 25. By arranging limiting holes at different positions, accidental movement of the rack 25 due to vibration during operation can be reduced, further improving the stability of the system. The rack 25 is prevented from falling out of the installation cavity 24 and being damaged.

[0039] The limiting hole can be a circular hole or an elliptical hole, which allows the limiting column 32 to move within a certain angle relative to the rack 25, facilitating the disengagement of the limiting column 32 from the limiting hole. The limiting column 32 can be cylindrical or conical.

[0040] In some embodiments, the second end of the limiting column 32 is hemispherical to reduce friction.

[0041] Specifically, the second end of the limiting column 32 is hemispherical, so that the limiting column 32 is in point contact with the wall of the limiting hole when in contact, rather than the traditional flat contact, which can reduce friction and improve the flexibility of the movement of the limiting column 32 in the limiting hole.

[0042] On the other hand, the hemispherical shape allows the limiting column 32 to have a certain self-alignment ability when entering the limiting hole. Even if the initial alignment of the limiting column 32 with the limiting hole is not completely accurate, the curved surface of the hemisphere can guide the limiting column 32 to smoothly enter the limiting hole, reducing the difficulty of installation and improving the system fault tolerance.

[0043] Optionally, a wear-resistant coating such as polytetrafluoroethylene is coated on the inner wall of the limiting hole to reduce friction and improve wear resistance.

[0044] In some embodiments, when the first end of the rack 25 is located in the mounting cavity 24, the second end of the rack 25 protrudes from the side wall of the mounting plate 21.

[0045] Specifically, the protruding second end of the rack 25 allows the rack 25 to move to a certain extent in the mounting cavity 24, and at the same time, the protruding part of the second end realizes the connection or operation with other components (such as an external driving motor or a manual adjustment device), without worrying about the rack 25 completely entering the mounting cavity 24. The protruding second end can install the driving device of the rack 25 outside the mounting plate 21, avoiding interference between the driving device and the components in the mounting cavity 24, and improving the overall reliability of the system.

[0046] Optionally, a guide groove is provided in the mounting cavity 24 to guide the movement of the rack 25 and reduce the shaking of the rack 25 relative to the mounting plate 21. Alternatively, a guide groove is provided on the rack 25, and a guide strip is provided in the mounting cavity 24, which is in sliding fit with the guide groove to guide the movement of the rack 25.

[0047] In some embodiments, the monitoring mechanism 1 further comprises a baffle, which is slidably connected to the monitoring box 11 to block the noise hole 112.

[0048] Specifically, the baffle can be a rectangular baffle, a circular baffle or a baffle of other shapes, and the opening of the noise hole 112 is adjusted by moving or rotating the baffle until the noise hole 112 is closed. As the baffle moves relative to the noise hole 112, the opening size of the noise hole 112 changes, changing the noise entering the monitoring box 11.

[0049] The noise hole 112 can be multiple, and the multiple noise holes 112 can be distributed in a rectangular array, a ring array or uniformly distributed within a circular range. In this way, the baffle sliding can simultaneously close multiple noise holes 112, and the number of noise holes 112 opening changes as the baffle moves. When the noise intensity is high, the baffle can be slid to the position of the noise hole 112 to reduce the amount of noise entering the monitoring box 11; when the noise is weak, the baffle can be slid away to increase the amount of noise entering. On the one hand, it can prevent too much noise from entering and causing the noise sensor 4 to overload, and on the other hand, it can appropriately increase the amount of noise entering when the noise is low to improve the monitoring sensitivity, and the baffle can prevent impurities such as dust and moisture from entering the inside of the monitoring box 11 through the noise hole 112, protecting the internal noise sensor 4 and other electronic devices, and prolonging the service life of the device.

[0050] In some embodiments, a box cover 111 is hinged at the box opening of the monitoring box 11, the length direction of the box cover 111 is parallel to the length direction of the monitoring box 11, and the side away from the hinged end of the box cover 111 is detachably connected to the edge of the box opening of the monitoring box 11 by a buckle, and the box cover 111 closes the box opening of the monitoring box 11 when it is closed.

[0051] Specifically, the box cover 111 is installed at the box opening of the monitoring box 11 by hinging, and the hinged end allows the box cover 111 to rotate around the hinge axis, thereby realizing the opening and closing operation of the box cover 111. The box cover 111 facilitates quick opening and closing of the monitoring box 11, and the buckle can fix the box cover 111 to prevent the monitoring box 11 from opening under vibration.

[0052] Optionally, a sealing strip is arranged at the box cover 111 and the box opening of the monitoring box 11 to improve the sealing effect of the box body and prevent external substances from entering.

[0053] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0054] In addition, the terms "first", "second", etc. are used only for descriptive purposes and do not connote or imply relative importance or a quantity of the indicated elements. Thus, a feature defined with "first", "second", etc. can include at least one of the features, either explicitly or implicitly. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0055] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection or communication with each other; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically defined. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0056] In the present application, unless otherwise specifically defined and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0057] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in the specification and the features of different embodiments or examples, without contradiction.

[0058] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and cannot be construed as limiting the present application, and the changes, modifications, replacements and variations of the above embodiments made by those skilled in the art are within the scope of the present application.

Claims

1. A generator set noise monitoring system, characterized in that, include: The monitoring mechanism includes a monitoring box and a positioning column. The positioning column is arranged at the bottom of the monitoring box, and a noise hole is provided on the side wall of the monitoring box, which connects the inside and outside of the monitoring box. The fixing mechanism includes a mounting plate and a connecting plate. The mounting plate is provided with positioning holes corresponding to the positioning columns. Both ends of the mounting plate are pivotally connected to a connecting plate. The connecting plate is provided with connecting holes for fixing to the generator set. The sensing mechanism includes a noise sensor, a PLC processor, and a signal transmitter, which are electrically connected to each other.

2. The generator set noise monitoring system according to claim 1, characterized in that, The fixing mechanism further includes a rack and a half gear. The mounting plate has a mounting cavity. The positioning post enters the mounting cavity through the positioning hole. The side wall of the mounting plate is provided with an opening. The rack enters the mounting cavity through the opening. The half gear is arranged in the mounting cavity and is pivotally connected to the mounting plate. The half gear can mesh with the rack. The side wall of the positioning post is provided with an annular groove. The half gear can rotate into the annular groove to restrict the axial movement of the positioning post.

3. The generator set noise monitoring system according to claim 2, characterized in that, The first circumferential surface of the half gear has teeth distributed thereon, and the teeth on the first circumferential surface of the half gear mesh with the rack. The second circumferential surface of the half gear engages with the annular groove.

4. The generator set noise monitoring system according to claim 3, characterized in that, A release groove is provided on the second circumferential surface of the half gear. The radius of the release groove is the same as the radius of the positioning hole, and the center of the release groove coincides with the projection of the center of the positioning hole onto the horizontal plane.

5. The generator set noise monitoring system according to claim 2, characterized in that, It also includes a limiting structure, which includes a fixing block, a limiting post, and a spring. The fixing block is arranged in the mounting cavity and located beside the rack. A sliding hole is provided at one end of the fixing block adjacent to the rack. Correspondingly, a first limiting hole is provided on the side wall of the rack. The first end of the limiting post enters the sliding hole and moves relative to the fixing block. The spring is located in the sliding hole, and both ends of the spring are respectively connected to the limiting post and the fixing block.

6. The generator set noise monitoring system according to claim 5, characterized in that, A second limiting hole is provided on the rack. The second limiting hole is spaced a certain distance from the first limiting hole and is located on the same side of the rack. The second limiting hole is located on the side of the first limiting hole adjacent to the mounting cavity.

7. The generator set noise monitoring system according to claim 5, characterized in that, The second end of the limiting post is a hemispherical surface to reduce friction.

8. The generator set noise monitoring system according to claim 2, characterized in that, When the first end of the rack is located inside the mounting cavity, the second end of the rack protrudes from the side wall of the mounting plate.

9. The generator set noise monitoring system according to claim 1, characterized in that, It also includes a baffle that is slidably connected to the monitoring box to block the noise hole.

10. The generator set noise monitoring system according to claim 1, characterized in that, The monitoring box has a hinged lid at the opening. The length of the lid is parallel to the length of the monitoring box. The side of the lid away from the hinge is detachably connected to the edge of the monitoring box opening via a buckle. When the lid is closed, it seals the opening of the monitoring box.

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