Noise online detection device and detection method for driving unit assembly

Abstract

The invention discloses a noise online detection device and method for a driving unit assembly, and belongs to the field of noise detection. The device comprises a control system, a supporting structure, an electric appliance cabinet, a soundproof box, a detection probe, a lifting plate, a fixing assembly, a load assembly, a driving assembly and the like. Wherein the lower box body can form a closed environment on the outer side of a detection station, so that the noise influence in a workshop environment is isolated, a streamlined assembly line directly penetrates through the online detection device, and a driving unit assembly needing to be detected can be lifted to be separated from a conveying line through a lifting plate until the driving unit assembly reaches the detection station for subsequent detection work. The whole process is high in automation degree, online detection can be completed without transfer of the driving unit assembly, the whole production period can be effectively shortened, the production efficiency is improved, and a large number of intermediate products do not exist.

Description

Technical Field

[0001] The present invention relates to the field of noise detection, and in particular to an online noise detection device and a detection method for a drive unit assembly. Background Art

[0002] The drive unit assembly of an electric forklift is one of its core components, responsible for converting electrical energy into mechanical energy to propel the forklift. The noise level of a forklift drive unit is a key quality indicator. Therefore, after assembly, a run-in and noise level test are required.

[0003] In actual production, the presence of a large variety of equipment in the production workshop creates numerous noise sources, which can severely impact the noise testing process of the drive unit assembly after assembly. To reduce the impact of ambient noise in the workshop, assembly noise testing is typically performed offline, in an isolated area. However, this approach results in a high volume of intermediate work-in-progress (WIP) and requires cross-regional product turnover, resulting in lower overall efficiency, longer production cycles, and relatively slow feedback on test results. Summary of the Invention

[0004] The present invention provides an online noise detection device and a detection method for a drive unit assembly, which can solve the problems of low offline detection efficiency and long cycle in the prior art of noise detection.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A noise online detection device for a drive unit assembly, comprising:

[0007] A support structure, the support structure being located on a production line of the drive unit assembly and having an inspection station disposed therein;

[0008] An electrical cabinet, the electrical cabinet being used to supply power to the drive unit assembly to be tested;

[0009] A soundproof box, the soundproof box is arranged on the supporting structure and is enclosed outside the detection station, and an inlet and outlet are provided at the bottom of the soundproof box;

[0010] A detection probe, the detection probe being arranged in the soundproof box;

[0011] A lifting plate, located below the inspection station and having dimensions consistent with those of the inlet and outlet, and provided with a receiving structure corresponding to the drive unit assembly;

[0012] a first driving assembly, the first driving assembly being used to drive the lifting plate toward or away from the inlet and outlet;

[0013] A fixing assembly, the fixing assembly being used to fix the drive unit assembly located at the inspection station;

[0014] A load component is used to apply load pressure to the drive unit assembly located at the detection station.

[0015] In one embodiment of the present invention, the support structure includes a base and a support frame, and the support frame is fixedly arranged on the base.

[0016] In one embodiment of the present invention, the soundproof box includes an upper box body and a lower box body, the upper box body is fixedly arranged on the supporting structure, the lower box body is located outside the detection station, and the detection probe is arranged in the upper box body.

[0017] In one embodiment of the present invention, the lower box body is slidably arranged on the supporting structure, and the second driving assembly is drivingly connected to the lower box body to drive the lower box body to move linearly up and down.

[0018] In one embodiment of the present invention, the fixed assembly includes a fixed pressure head and a third driving assembly, the fixed pressure head is located above the detection station, and the third driving assembly is arranged on the supporting structure and is used to drive the fixed pressure head toward / away from the detection station.

[0019] In one embodiment of the present invention, the load assembly includes a load pressure head, two pressure rollers spaced apart, and a fourth drive assembly. The load pressure head is fixedly mounted on a support structure. The load pressure head and the pressure roller are located on both sides of the inspection station, respectively. The fourth drive assembly is used to drive the pressure roller toward / away from the inspection station.

[0020] In one solution of the present invention, a protective net is provided on the outside of the supporting structure, and an operation gap is opened on the protective net.

[0021] In one solution of the present invention, safety gratings are respectively provided on both sides of the operation gap.

[0022] In one embodiment of the present invention, a display screen is provided on the protective net, and the display screen is connected to the detection probe.

[0023] A method for online noise detection of a drive unit assembly comprises the following steps:

[0024] Transport the drive unit assembly to be inspected to the top of the lifting plate;

[0025] Connect the wires drawn out from the electrical cabinet to the power cord of the drive unit assembly to be tested for power supply;

[0026] The first drive assembly is started, driving the lifting plate to move, and driving the drive unit assembly located thereon to move toward the detection station;

[0027] When the drive unit assembly moves to the inspection station, the first drive assembly stops. At this time, the lifting plate is located at the inlet and outlet positions, forming a closed space with the sound insulation box;

[0028] The third drive assembly is activated, driving the pressure head downward to abut against the drive unit assembly located on the inspection station, thereby securing it;

[0029] The fourth drive assembly is activated to drive the pressure roller close to the drive unit assembly located on the inspection station, so that the pressure roller abuts against the wheel body of the drive unit assembly and applies a load thereto;

[0030] The drive unit assembly is powered on and run-in is performed, and the running-in noise in the soundproof box is captured by the detection probe and uploaded to the control system and / or display screen. After the specified running-in detection time, the drive unit assembly is powered off, the load component and the fixed component are separated from the drive unit assembly in turn and reset, and the lifting plate moves downward and resets. Finally, the drive unit assembly that has completed the detection is separated from the lifting plate, completing the detection action of the drive unit assembly.

[0031] According to the present invention, an online noise detection device and detection method for a drive unit assembly have at least one of the following technical effects:

[0032] In the present application, a noise online detection device for a drive unit assembly is provided, including a lower box that can form a closed environment outside the detection station, thereby isolating the noise influence in the workshop environment, and a streamlined assembly line directly runs through the above-mentioned online detection device. The drive unit assembly to be detected can be lifted off the conveyor line by a lifting plate to the detection station for subsequent detection work. The entire process has a high degree of automation, and online detection can be completed without the need to transport the drive unit assembly, which can effectively shorten the entire production period, improve production efficiency, and there are no large amounts of intermediate work-in-progress. Since the data collected by the detection probe can be uploaded to the control system in real time and can also be displayed on the display screen, whether the test results meet the standards can be directly concluded on site, and then feedback can be quickly given to the previous process, the cause of the problem can be promptly investigated, and the number of defective and unqualified products can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood in conjunction with the following description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention, and those skilled in the art can derive other drawings based on these drawings without inventive effort. Among them:

[0034] Figure 1 A schematic diagram of the overall three-dimensional structure of an online noise detection device for a drive unit assembly provided by the present invention;

[0035] Figure 2 This is a schematic diagram of the three-dimensional structure of an online noise detection device for a drive unit assembly provided by the present invention, with the protective net and the soundproof box removed;

[0036] Figure 3 The present invention provides an online noise detection device for a drive unit assembly Figure 1 Schematic diagram of the structure from the middle side;

[0037] Figure 4 The present invention provides an online noise detection device for a drive unit assembly Figure 1 Schematic diagram of the structure in the middle front view;

[0038] Figure 5 The present invention provides an online noise detection device for a drive unit assembly Figure 4 Schematic diagram of the structure of the cross-section at AA;

[0039] Figure 6 The present invention provides an online noise detection device for a drive unit assembly Figure 4 Schematic diagram of the structure of the cross-section at BB;

[0040] Figure 7 This is a schematic diagram of the three-dimensional structure of a fixed pressure head in an online noise detection device for a drive unit assembly provided by the present invention;

[0041] Figure 8 This is a structural schematic diagram of a conveyor line of an online noise detection device for a drive unit assembly provided by the present invention.

[0042] Description of reference numerals:

[0043] 1. Electrical cabinet; 2. Pipeline trough; 3. Display screen; 4. Protective net; 5. Safety light curtain; 6. Lower box; 7. Base; 8. Upper box; 9. Start / stop button; 10. Drive unit assembly to be tested; 11. First guide rod; 12. Second drive assembly; 13. Pressure roller; 14. Fourth drive assembly; 15. Third drive assembly; 16. Fixed pressure head; 17. Fixed guide rod; 18. Lifting plate; 19. Lifting guide rod; 20. First drive assembly; 21. Detection probe; 22. Load guide rod; 23. Load pressure head; 24. Conveyor line. DETAILED DESCRIPTION

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0045] like Figure 1-8 As shown, an embodiment of the present invention provides an online noise detection device for a drive unit assembly, comprising: a control system, a support structure, an electrical cabinet 1, a soundproof box, a detection probe 21, a lifting plate 18, a fixing assembly, a load assembly, and a drive assembly. The control system can be a control terminal or a PLC control system, which is used to control the operation of the entire device. The support structure is located on the production line of the drive unit assembly and is provided with a detection station. The support structure can be configured as a frame structure to provide support. Specifically, the support structure can include a base 7 and a support frame, which is fixedly mounted on the base 7. The base 7 is fixedly mounted on the ground, and the support frame is fixedly mounted above the base 7 to form a frame structure, which is provided with installation space for accommodating various structures. Specifically, the support frame can include a first guide rod 11, a second guide rod, a first top plate, and a second top plate. The lower ends of the plurality of first guide rods 11 are respectively fixedly connected to the base 7, and the upper ends are fixedly connected via the first top plate. The lower ends of the plurality of second guide rods are fixedly connected to the first top plate, and the upper ends are fixedly connected via the second top plate.

[0046] See also Figure 1-8 In one embodiment of the present invention, the sound insulation box is arranged on the supporting structure and is enclosed outside the inspection station. The bottom of the sound insulation box is provided with an inlet and outlet. The sound insulation box is used to form a closed environment outside the inspection station to isolate the workshop ambient noise, thereby avoiding the impact of the workshop ambient noise on the assembly inspection, and realizing online noise detection.

[0047] See also Figure 1-8In one embodiment of the present invention, the soundproof box may be provided with a reserved interface for the entry and exit of cables or other structures. As an example, the soundproof box may include an upper box 8 and a lower box 6, wherein the upper box 8 is fixedly mounted on the support structure and is located outside the frame formed by the second guide rod and the second top plate. The lower box 6 is located outside the detection station, and the detection probe 21 is disposed within the upper box 8. The lower box 6 is slidably mounted on the support structure, and the second drive assembly 12 is driven and connected to the lower box 6 to drive the lower box 6 to move linearly up and down. Specifically, the bottom wall of the lower box 6 is provided with multiple through holes, or multiple sleeves are provided, which are respectively slidably mounted on the corresponding first guide rods 11, and the upper end thereof is provided with a through hole for slidingly cooperating with the outer wall of the upper box 8 up and down. The second drive assembly 12 can be a cylinder fixedly mounted on the first top plate, and the free end of its piston rod is fixedly connected to the bottom wall of the lower box 6 to drive the lower box 6 to move up and down. The lower box body 6 can move up and down, and its internal mechanism can be maintained or observed when necessary. At the same time, the lower box body 6 can be moved downward during inspection to prevent the drive unit assembly from being too far away from the conveyor line 24.

[0048] See also Figure 1-8 In one embodiment of the present invention, the detection probe 21 is disposed within the soundproof box; specifically, the detection probe 21 can be positioned near the inspection station to facilitate data collection. The detection probe 21 captures the running-in noise within the soundproof box and uploads it to a control system for data analysis. A display can also be provided to display the noise data collected by the detection probe 21 in real time, thereby enabling better differentiation and judgment of product quality.

[0049] See also Figure 1-8 In one embodiment of the present invention, the lifting plate 18 is located below the inspection station, and its size is consistent with the size of the inlet and outlet. The lifting plate 18 is provided with a accommodating structure corresponding to the drive unit assembly; the accommodating structure can be a sink structure, a hole structure or an auxiliary fixture structure. When the drive unit assembly 10 to be tested is transported to the top of the lifting plate 18, the lifting plate 18 rises and drives the assembly product to rise, and the stability of the drive unit assembly is ensured by the accommodating structure. The first drive component 20 is used to drive the lifting plate 18 to move closer to / away from the inlet and outlet; as an example, the first drive component 20 can be a cylinder structure fixed below the base 7, whose piston rod passes through the base 7 and is fixedly connected to the lifting plate 18, and is used to drive the lifting plate 18 to move up and down.

[0050] See also Figure 1-8In one embodiment of the present invention, the fixing assembly is used to cooperate with the lifting plate 18 to fix the drive unit assembly located at the detection station; as an example, the fixing assembly includes a fixed pressure head 16 and a third drive assembly 15, the fixed pressure head 16 is located above the detection station, and the third drive assembly 15 is arranged on the support structure and is used to drive the fixed pressure head 16 to approach / move away from the detection station. Specifically, the fixed pressure head 16 includes a bottom wall and a side wall fixedly set into a barrel-shaped structure, and the end of the side wall away from the bottom wall can be provided with a plurality of stabilizing notches and avoidance notches, the size of the avoidance notches is larger than the size of the stabilizing notches, and the fixed pressure head 16 with a barrel-shaped structure is used to effectively press down and fix the upper end of the drive unit assembly 10 to be tested, and the stability of the assembly fixation is improved by providing the stabilizing notches and avoidance notches, and the related structures on the assembly can be avoided by the avoidance notches. The third driving assembly 15 can be a cylinder structure fixedly arranged on the second top plate, and the free end of its piston rod is fixedly connected to the side of the bottom wall of the fixed pressure head 16 away from the side wall, for driving the fixed pressure head 16 to move up and down.

[0051] See also Figure 1-8 In one embodiment of the present invention, the load assembly is used to apply load pressure to the drive unit assembly located at the inspection station. Specifically, as an example, the load assembly includes a load pressure head 23, two spaced pressure rollers 13, and a fourth drive assembly 14. The load pressure head 23 is fixedly mounted on the support structure. The load pressure head 23 and the pressure rollers 13 are respectively located on either side of the inspection station. The fourth drive assembly 14 is used to drive the pressure rollers 13 toward / away from the inspection station. The fourth drive assembly 14 can be a cylinder fixedly mounted on the support structure or the bottom wall of the lower housing 6. The movable end of the piston rod is fixedly connected to a roller seat. Two pressure rollers 13 are spaced apart on the roller seat, and the axes of the pressure rollers 13 are arranged vertically. A drive assembly can also be provided between the load pressure head 23 and the support structure. During use, the drive assembly drives the pressure rollers 13 and the load pressure head 23 to abut the drive unit assembly located at the inspection station, applying load pressure thereto. The specific load pressure can be achieved by adjusting the pressure value of the cylinder.

[0052] See also Figure 1-8In one embodiment of the present invention, in order to ensure the stability of the structure driven by the cylinder during operation, a guide structure is provided at the corresponding position of each moving part. Specifically, the guide structure of the lower box body 6 is a first guide rod 11, and the movement process of the lower box body 6 is stabilized by multiple first guide rods 11. The guide structure of the lifting plate 18 may include multiple lifting guide rods 19, one end of which can be fixed on the base 7 and then movably pass through the lifting plate 18. The upper end can also be fixed on the bottom of the lifting plate 18, and the lower end can be movably passed through the base 7. The specific structure can be selected according to actual conditions. It can play a guiding and stabilizing role in the up and down movement of the lifting plate 18. The fixed pressure head 16 can be connected to a fixed seat, and a fixed guide rod 17 that slides through the second top plate is connected to the fixed seat, so that it can play a guiding and stabilizing role in the up and down movement of the fixed pressure head 16. Load guide rods 22 can be set on the front and rear sides of the detection station, and the load pressure head 23 and the roller seat can be fixed with connecting plates respectively, and then the connecting plates are movably connected to the load guide rods 22, thereby playing a guiding and stabilizing role in the horizontal movement process of the load pressure head 23 and the roller seat.

[0053] See also Figure 1-8 In one embodiment of the present invention, the electrical cabinet 1 is used to supply power to the drive unit assembly 10 to be tested; a pipeline trough 2 can be provided between the electrical cabinet 1 and the soundproof box for laying cables. A protective net 4 can be provided on the outside of the support structure for shielding and protection, and an operating gap is provided on the protective net 4. Safety gratings 5 ​​are provided on both sides of the operating gap. The safety grating 5 is connected to the control system. When the safety grating 5 detects the presence of an entity in the operating gap, if an operator reaches into the space enclosed by the protective net 4, the downward movement of the lower box 6 stops, the movement of the lifting plate 18 can also stop, and an alarm can be issued to prevent accidents. A display screen 3 can be provided on the protective net 4, and the display screen 3 is connected to the detection probe 21. A start-stop button 9 can also be provided on the protective net 4 to control the start and stop of related devices.

[0054] Working principle of the present invention: A method for online noise detection of a drive unit assembly comprises the following steps:

[0055] The drive unit assembly to be tested is transported to the top of the lifting plate 18; the online detection device described in this application can be set at the end or output end of the assembly line, and can be transported to this position for noise detection after the drive unit assembly is assembled. Specifically, the method of transporting the drive unit assembly to be tested to the top of the lifting plate 18 is not limited. Preferably, an existing conveyor line 24 is used to pass through the online detection device, and the conveyor line 24 includes two spaced conveyor racks, and the conveyor racks are provided with conveyor rollers (as shown in the figure). The lifting plate 18 is located between the two conveyor racks, and the width of the lifting plate 18 is smaller than the spacing between the two conveyor racks and the width of the drive unit assembly, and its length is greater than the size of the drive unit assembly. When the product is transported to the top of the lifting plate 18 on the conveyor line 24, the conveyor line 24 is controlled by the control system to slow down or stop. At this time, the power supply is connected to the power cord of the drive unit assembly to be tested through the wire drawn from the electrical cabinet 1; specifically, a docking socket can be provided on the drive unit assembly, and a corresponding plug can be provided on the cable drawn from the electrical cabinet 1, so that fast docking and plugging power supply can be achieved. Then, the first drive assembly 20 is activated by a control button, driving the lifting plate 18 to move upward, and driving the drive unit assembly located thereon to move toward the inspection station, so that the drive unit assembly 10 to be tested moves upward and away from the conveyor line 24. When the drive unit assembly moves to the inspection station, the first drive assembly 20 stops. At the same time, the third drive component 15 is started, and the driving pressure head moves downward to abut the drive unit assembly located on the detection station to fix it; then, the fourth drive component 14 is started, driving the pressure roller 13 and the load pressure head 23 to move simultaneously toward the drive unit assembly located on the detection station, so that the load pressure head 23 and the pressure roller 13 respectively abut on both sides of the drive unit assembly to apply load thereto, wherein the pressure roller 13 abuts on the wheel body of the drive unit assembly; then, the lower box 6 is driven downward by the driving component, so that the lower box 6 contacts the contact plate, that is, the lifting plate 18 is located at the inlet and outlet position at the bottom of the lower box 6, forming a closed space with the sound insulation box; at this time, the drive unit assembly is located in the closed space enclosed by the lower box 6 and the lifting plate 18. Then, the drive unit assembly is powered on and run-in is performed, and the running-in noise in the soundproof box is captured by the detection probe 21 and uploaded to the control system and / or display screen 3. After the specified running-in detection time, the running-in is completed, the drive unit assembly is powered off, the lower box body 6 moves upward and resets, the load component and the fixed component are separated from the drive unit assembly and reset in turn, and the lifting plate 18 moves downward and resets. Finally, the drive unit assembly that has completed the inspection is separated from the lifting plate 18, so that the drive unit assembly after the inspection falls back onto the conveyor line 24, completing the inspection action of the drive unit assembly. At this time, the conveyor line 24 operates to transport the completed finished product away from the device, and at the same time transports the next product to the position of the online inspection device for the next inspection.

[0056] In the present application, a noise online detection device for a drive unit assembly is provided, including a lower box 6 that can form a closed environment outside the detection station, thereby isolating the noise influence in the workshop environment. The streamlined assembly line directly runs through the above-mentioned online detection device, and the drive unit assembly to be detected can be lifted off the conveyor line 24 by the lifting plate 18 to the detection station for subsequent detection work. The entire process has a high degree of automation, and online detection can be completed without the need to transport the drive unit assembly, which can effectively shorten the entire production period, improve production efficiency, and there are no large amounts of intermediate work-in-progress. Since the data collected by the detection probe 21 can be uploaded to the control system in real time and can also be displayed on the display screen 3, whether the test results meet the standards can be directly concluded on site, and then feedback can be quickly provided to the previous process, the cause of the problem can be promptly checked, and the number of defective and unqualified products can be reduced.

[0057] The above is a detailed description of an embodiment of the present invention. However, the content described is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the claims of the present invention.

[0058] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0059] In the description of the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0060] It should also be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "disposed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

Claims

1. A noise online detection device for a drive unit assembly, characterized in that: include: A support structure, the support structure being located on a production line of the drive unit assembly and having an inspection station disposed therein; An electrical cabinet, the electrical cabinet being used to supply power to the drive unit assembly to be tested; A soundproof box, the soundproof box is arranged on the supporting structure and is enclosed outside the detection station, and an inlet and outlet are provided at the bottom of the soundproof box; A detection probe, the detection probe being arranged in the soundproof box; A lifting plate, located below the inspection station and having dimensions consistent with those of the inlet and outlet, and provided with a receiving structure corresponding to the drive unit assembly; a first driving assembly, the first driving assembly being used to drive the lifting plate toward or away from the inlet and outlet; A fixing assembly, the fixing assembly being used to fix the drive unit assembly located at the inspection station; A load component is used to apply load pressure to the drive unit assembly located at the detection station.

2. The noise online detection device for a drive unit assembly according to claim 1, characterized in that: The supporting structure includes a base and a supporting frame, and the supporting frame is fixedly arranged on the base.

3. The noise online detection device for a drive unit assembly according to claim 1, characterized in that: The soundproof box includes an upper box body and a lower box body. The upper box body is fixedly arranged on the supporting structure, the lower box body is located outside the detection station, and the detection probe is arranged in the upper box body.

4. The noise online detection device for a drive unit assembly according to claim 3, characterized in that: The lower box body is slidably arranged on the supporting structure up and down, and the second driving component is drivingly connected to the lower box body to drive the lower box body to move linearly up and down.

5. The noise online detection device for a drive unit assembly according to claim 1, characterized in that: The fixed assembly includes a fixed pressure head and a third driving assembly. The fixed pressure head is located above the detection station. The third driving assembly is arranged on the supporting structure and is used to drive the fixed pressure head to approach / move away from the detection station.

6. The noise online detection device for a drive unit assembly according to claim 1, characterized in that: The load assembly includes a load pressure head, two pressure rollers arranged at intervals, and a fourth drive assembly. The load pressure head is fixedly arranged on the support structure. The load pressure head and the pressure roller are respectively located on both sides of the detection station. The fourth drive assembly is used to drive the pressure roller to approach / move away from the detection station.

7. The noise online detection device for a drive unit assembly according to claim 1, characterized in that: A protective net is provided on the outside of the supporting structure, and an operation gap is opened on the protective net.

8. The noise online detection device for a drive unit assembly according to claim 7, characterized in that: Safety gratings are respectively arranged on both sides of the operation gap.

9. The noise online detection device for a drive unit assembly according to claim 7, characterized in that: A display screen is provided on the protective net, and the display screen is connected to the detection probe.

10. A method for online noise detection of a drive unit assembly, characterized in that: The steps include: Transport the drive unit assembly to be inspected to the top of the lifting plate; Connect the wires drawn out from the electrical cabinet to the power cord of the drive unit assembly to be tested for power supply; The first drive assembly is started, driving the lifting plate to move, and driving the drive unit assembly located thereon to move toward the detection station; When the drive unit assembly moves to the inspection station, the first drive assembly stops. At this time, the lifting plate is located at the inlet and outlet positions, forming a closed space with the sound insulation box; The third drive assembly is activated, driving the pressure head downward to abut against the drive unit assembly located on the inspection station, thereby securing it; The fourth drive assembly is activated to drive the pressure roller close to the drive unit assembly located on the inspection station, so that the pressure roller abuts against the wheel body of the drive unit assembly and applies a load thereto; The drive unit assembly is powered on and run-in is performed, and the running-in noise in the soundproof box is captured by the detection probe and uploaded to the control system and / or display screen. After the specified running-in detection time, the drive unit assembly is powered off, the load component and the fixed component are separated from the drive unit assembly in turn and reset, and the lifting plate moves downward and resets. Finally, the drive unit assembly that has completed the detection is separated from the lifting plate, completing the detection action of the drive unit assembly.

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