Detection method for online counter electromotive force zero point of multi-gear electric drive assembly

Abstract

The invention discloses an online counter electromotive force zero point detection method for a multi-gear electric drive assembly, and the method comprises the steps: placing the multi-gear electric drive assembly and a tray on a conveying roller way, and conveying the multi-gear electric drive assembly and the tray to a detection station; the tray loaded with the multi-gear electric drive assembly is lifted and positioned; the initial weight of the tray and the initial weight of the multi-gear electric drive assembly after lifting and positioning are recorded; lubricating oil is injected or extracted into the multi-gear electric drive assembly, and the weight after injection or extraction is recorded, so that the residual weight in the multi-gear electric drive assembly reaches a design value; the multi-gear electric drive assembly is clamped, positioned and electrified for butt joint; the motor is in butt joint with a spline shaft of the multi-gear electric driving assembly and drives the multi-gear electric driving assembly to rotate at a stable rotating speed; in the rotating process, counter electromotive force and zero point detection is carried out on the multi-gear electric drive assembly; controlling an oil pump to start and shift to detect counter electromotive forces and zero points under different gears; and recording and storing detection data, and completing the detection process. According to the method, accurate measurement and effective control of the multi-gear electric drive assembly can be realized.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical manufacturing, and in particular to an online back-electromotive force zero point detection method for a multi-speed electric drive assembly. Background Art

[0002] In the field of mechanical manufacturing technology, the performance detection of electric drive assemblies has always been a crucial link, especially for multi-speed electric drive assemblies, whose complexity and precision requirements make the detection process particularly critical. Among them, the detection of back-EMF zero point, as one of the important indicators for the performance evaluation of electric drive assemblies, plays a vital role in ensuring the stability and efficiency of motor operation. However, the current back-EMF zero point detection methods on the market have many shortcomings and are difficult to meet the growing detection needs.

[0003] Traditional back-EMF zero-point detection methods are mainly divided into two types.

[0004] The first is to use a small test bench for testing. This method is usually suitable for motor assemblies or stators and rotors with simple structures and easy installation. During the test process, the test bench provides a rotating drag device, manually or automatically docks the drag device with the rotor, manually connects the test harness, and then drags the rotor for stable rotation to detect the back EMF zero point. However, for multi-speed electric drive assemblies with complex structures and strict assembly requirements, small test benches are obviously unable to meet their testing needs. Because multi-speed electric drive assemblies usually contain multiple components and complex transmission systems, more accurate and efficient detection methods are required to ensure their performance.

[0005] The second method is to use a large test bench for testing. This method usually sets up a large area near the production line, including a lubricating oil filling system, a weighing system, and various rotary docking and pipeline systems. During the inspection process, the product is manually lifted from the production line to the test bench, and then the various pipelines are manually or automatically docked to detect the zero point of the back EMF. Although large test benches have improved the accuracy and reliability of detection to a certain extent, their disadvantages are also significant. First, large test benches occupy a large area and consume a lot of resources and space. Secondly, the lifting process of the product is cumbersome and time-consuming, which reduces the efficiency of detection. In addition, large test benches can usually only test a single product and cannot achieve batch testing, which limits the beat and production capacity of the production line.

[0006] In view of the above problems, the industry urgently needs a more efficient, reliable back-EMF zero-point detection method suitable for large-scale, high-beat assembly line production. This detection method needs to be able to reduce the footprint, simplify the operation process and improve the detection efficiency while ensuring the detection accuracy and reliability. However, the existing detection technology is difficult to meet these requirements. Summary of the invention

[0007] In order to solve the problem of detecting the back-EMF zero point of a complex electric drive assembly, the present invention proposes a new online back-EMF zero point detection method. The method combines advanced automation technology and precise measurement means, and can realize fast and accurate detection of multi-speed electric drive assemblies on the assembly line. Compared with the existing detection methods, the online back-EMF zero point detection method of the present invention has higher detection efficiency and more reliable detection data. At the same time, the method can also avoid adverse effects on the product, thereby ensuring the quality and performance of the product.

[0008] In order to solve the above technical problems, the present invention is implemented by the following technical solutions:

[0009] A method for detecting an online back-electromotive force zero point of a multi-speed electric drive assembly comprises the following steps:

[0010] Place the multi-speed electric drive assembly and the pallet on the conveyor roller and transport them to the inspection station;

[0011] Lift and position the pallet carrying the multi-speed electric drive assembly;

[0012] Record the initial weight of the pallet and multi-speed electric drive assembly after lifting and positioning;

[0013] Fill or extract lubricating oil from the multi-speed electric drive assembly, monitor and record the weight after filling or extraction, and calculate the difference so that the weight of the lubricating oil remaining in the multi-speed electric drive assembly reaches the designed value;

[0014] Clamp and position the multi-speed electric drive assembly;

[0015] Power on and connect the multi-speed electric drive assembly;

[0016] Docking with the spline shaft of the multi-speed electric drive assembly and driving it to rotate at a stable speed;

[0017] During the rotation process, the back electromotive force and zero point of the multi-speed electric drive assembly are detected;

[0018] Record and store test data to complete the test process.

[0019] As a further optimization scheme of the present invention, a back-EMF zero point detection device is used to detect the online back-EMF zero point of the multi-speed electric drive assembly, and the back-EMF zero point detection device includes a base installed at the detection station and a platform scale, a lifting and positioning assembly and an automatic oil filling and pumping assembly integrated on the base; the pallet carrying the multi-speed electric drive assembly is lifted and positioned by the lifting and positioning assembly; the platform scale is used to record the initial weight of the pallet and the multi-speed electric drive assembly after lifting and positioning, and the weight after filling or pumping is monitored and recorded; the multi-speed electric drive assembly is filled with or pumped with lubricating oil by the automatic oil filling and pumping assembly.

[0020] As a further optimization solution of the present invention, the platform scale is installed in the avoidance groove on the top of the base, and the position of the platform scale relative to the avoidance groove in the height and horizontal direction is adjustable.

[0021] As a further optimization scheme of the present invention, a height adjustment structure for adjusting the height position of the platform scale is installed on the bottom surface of the platform scale; the height adjustment structure includes a clamping block, a screw rod is arranged through the middle of the clamping block, the top of the screw rod is threadedly connected to the bottom of the platform scale, a nut and a disc are fixed to the bottom of the screw rod below the clamping block, bolt holes are opened on both side edges of the clamping block, a first bolt fixed in the avoidance groove is installed in the bolt hole, and the hole diameter of the bolt hole is larger than the diameter of the first bolt.

[0022] As a further optimization scheme of the present invention, a horizontal adjustment structure for adjusting the horizontal position of the platform scale is installed in the avoidance groove; the horizontal adjustment structure includes an arc-shaped tightening block, which is fixed in the avoidance groove by a second bolt, and the arc-shaped tightening block is penetrated by a plurality of first horizontal adjustment bolts with different angles in the horizontal direction, and the first horizontal adjustment bolt can be in tight contact with the outer cylindrical surface of the disc through adjustment.

[0023] As a further optimization scheme of the present invention, the lifting and positioning assembly includes a lifting and fixing frame, which is fixed to the platform scale through a connecting base, a lifting plate is installed above the lifting and fixing frame through a telescopic sleeve, a lifting cylinder for driving the lifting plate to rise and fall is installed on the lifting and fixing frame, and a positioning pin for positioning the pallet is installed on the top surface of the lifting plate.

[0024] As a further optimization scheme of the present invention, the horizontal position of the lifting and fixing frame relative to the connecting base is adjustable; a large hole is provided on the support foot base plate at the bottom of the lifting and fixing frame, and the support foot base plate is connected to the threaded hole on the connecting base by a third bolt passing through the large hole, and the hole diameter of the large hole is larger than the diameter of the third bolt; the connecting base outside the support foot base plate is provided with fixing blocks in two vertical directions, and a second horizontal adjustment bolt is horizontally threaded through the fixing block, and the second horizontal adjustment bolt can be tightly contacted with the support foot base plate through adjustment.

[0025] As a further optimization scheme of the present invention, the automatic oil injection and oil pumping assembly includes a fixed rod, which is installed on the base and passes through the inside of the lifting and positioning assembly. A lifting cylinder and a linear guide are installed on the fixed rod through a first fixed connecting seat. An oil injection and oil pumping docking joint is slidably connected to the linear guide through a first movable connecting seat. The lifting cylinder is drivingly connected to the first movable connecting seat. A notch is provided on the top of the lifting and positioning assembly for the lifting and oil pumping docking joint to be lifted and docked. The automatic oil injection and oil pumping assembly and the platform scale and lifting and positioning assembly are staggered in height space.

[0026] As a further optimization scheme of the present invention, the back-electromotive force zero point detection device also includes a movable clamping assembly, a rotating drive assembly and a three-phase electrical docking assembly integrated on the base; the movable clamping assembly is used to clamp and position the multi-speed electric drive assembly; the rotating drive assembly is used to dock with the spline shaft of the multi-speed electric drive assembly and drive it to rotate at a stable speed; and the three-phase copper busbar on the multi-speed electric drive assembly is docked through the three-phase electrical docking assembly.

[0027] As a further optimization scheme of the present invention, the movable clamping assembly is installed on the base through a fixed support, and the movable clamping assembly includes a fixed frame installed on the top of the fixed support, a first movable frame slidably connected to the top of the fixed frame, a first driving cylinder for driving the first movable frame to slide forward and backward relative to the fixed frame, and a hydraulic clamping mechanism installed on the first movable frame and used to clamp the multi-speed electric drive assembly.

[0028] As a further optimization scheme of the present invention, a first slide rail is installed on the top of the fixed frame, and limit switches are installed on both front and rear ends of the first slide rail; the first driving cylinder is installed on the side of the fixed frame, and the output end of the first driving cylinder is drivingly connected to the first movable frame, and a drag chain is installed between the fixed frame and the first movable frame.

[0029] As a further optimization scheme of the present invention, a plurality of the hydraulic clamping mechanisms are circumferentially arranged on the front end surface of the first movable frame, each of the hydraulic clamping mechanisms includes a fixed seat installed on the front end surface of the first movable frame, a cylinder installed on the fixed seat, and a clamping block with one end drivingly connected to the cylinder, and the middle part of the clamping block is rotatably connected to the fixed seat through a rotating shaft and an axle seat.

[0030] As a further optimization scheme of the present invention, the rotation drive assembly includes a second movable frame slidably connected to the first movable frame, a first servo motor for driving the second movable frame to slide forward and backward relative to the first movable frame, and a second servo motor installed on the second movable frame. The output end of the second servo motor is connected to a docking sleeve for docking with a spline shaft on a multi-speed electric drive assembly through a telescopic assembly, and a through hole is opened on the first movable frame for the docking sleeve to pass through.

[0031] As a further optimization scheme of the present invention, a second slide rail is installed on the top of the first movable frame; the first servo motor is installed on the first movable frame, and the output end of the first servo motor is drivingly connected to the second movable frame through a gear and a rack; the second servo motor is installed on the second movable frame through a rotating bearing structure, and the output end of the second servo motor is connected to a docking sleeve through the telescopic assembly; the telescopic assembly includes a rotating shaft, one end of the rotating shaft is connected to the output end of the second servo motor through a coupling, and the other end is connected to the docking sleeve; a limit plate is installed in the middle of the rotating shaft, and a first spring is sleeved on the rotating shaft between the limit plate and the coupling, and there is a gap between the inner end of the rotating shaft and the inside of the coupling.

[0032] As a further optimization scheme of the present invention, the three-phase electrical docking assembly includes a fixed bracket installed on the first movable frame, a second driving cylinder installed on the fixed bracket, a mounting plate slidably connected to the bottom of the fixed bracket, and a docking structure installed on the mounting plate, and the mounting plate is drivingly connected to the output end of the second driving cylinder; the docking structure includes a nylon connecting plate installed on the mounting plate, comb-shaped guide bars installed side by side on the nylon connecting plate, a connecting shaft installed between two adjacent guide bars, a second spring sleeved on the connecting shaft, and a docking copper sleeve installed on the head of the connecting shaft.

[0033] As a further optimization scheme of the present invention, the second driving cylinder is installed on the fixed bracket through a second fixed connecting seat, and the output end of the second driving cylinder is drivingly connected to the mounting plate through a second movable connecting seat; a sliding seat is installed under the fixed bracket, and a third sliding rail is slidably connected under the sliding seat, and the third sliding rail is fixedly connected to the mounting plate; the mounting plate is fixedly connected to the third sliding rail through a rib plate and a fixed plate.

[0034] As a further optimization scheme of the present invention, the back-EMF zero point detection device also includes a back-EMF zero point measuring instrument and a multi-speed electric drive assembly controller integrated on the base, and the back-EMF zero point measuring instrument is used to detect the back-EMF and zero point of the multi-speed electric drive assembly; the oil pump start-up and gear shifting operations of the multi-speed electric drive assembly are controlled by the multi-speed electric drive assembly controller to detect the back-EMF and zero point in different gears.

[0035] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0036] (1) The online back-electromotive force zero point detection method of the present invention realizes a comprehensive detection of the multi-speed electric drive assembly by placing the multi-speed electric drive assembly and the pallet on the conveyor roller, and sequentially performing the steps of lifting and positioning, initial weight recording, lubricating oil filling or extraction, clamping and positioning, power-on docking, rotational driving, and back-electromotive force and zero point detection. At the same time, the present invention also provides a back-electromotive force zero point detection device for realizing the detection method, which includes components such as a base, a first device, a second device, a back-electromotive force zero point measuring instrument, and a multi-speed electric drive assembly controller, which can realize accurate measurement and effective control of the multi-speed electric drive assembly.

[0037] (2) This method realizes online testing on the assembly line without the need to lift the electric drive assembly from the production line to a separate test bench, thus greatly saving the product lifting time and test preparation time. Through automation technologies such as lifting positioning, automatic oil injection and oil extraction, clamping positioning, and power-on docking, the detection process is automated, reducing manual intervention and improving detection efficiency.

[0038] (3) This method uses high-precision measuring instruments and equipment, such as platform scales and back-EMF zero-point measuring instruments, to ensure the accuracy of the test data. Through stable rotation drive devices, such as servo motors and docking sleeves, the electric drive assembly can rotate stably during the test, thereby improving the accuracy of back-EMF zero-point detection.

[0039] (4) This method includes multiple safeguards during the detection process, such as precise adjustment of the lifting and positioning components and precise control of the automatic oil injection and pumping components, to ensure the reliability of the detection. During the detection process, if the electric drive assembly is overloaded or overheated, the controller can protect itself to avoid damage to the motor.

[0040] (5) This method can detect the back-electromotive force zero point under different gears, thereby meeting the detection requirements of multi-gear electric drive assemblies. The equipment and devices of this method can be customized and adjusted according to different electric drive assemblies to meet the detection requirements of electric drive assemblies of different models and specifications.

[0041] (6) Compared with large test benches, the equipment and devices required for this method occupy a smaller area, thus saving production space. By optimizing the detection process and the use of automated equipment, this method can reduce energy consumption and costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a structural schematic diagram of the back-electromotive force zero point detection device of the present invention.

[0043] Figure 2 This is a schematic diagram of the application structure of the back-electromotive force zero point detection device of the present invention on a production line.

[0044] Figure 3 It is a schematic structural diagram of the first device of the present invention.

[0045] Figure 4 It is a schematic diagram of the assembly structure of the platform scale and the lifting and positioning assembly of the present invention.

[0046] Figure 5 for Figure 4 Schematic diagram of the longitudinal cross-section structure.

[0047] Figure 6 for Figure 4 Schematic diagram of the transverse cross-sectional structure.

[0048] Figure 7 for Figure 4 A in the figure is an enlarged structural diagram.

[0049] Figure 8 for Figure 5 The enlarged structural diagram at B in FIG.

[0050] Fig. 9 It is a schematic structural diagram of the automatic oil filling and oil pumping assembly of the present invention.

[0051] Fig.10 The structure of the device of the present invention is shown in FIG. Figure 1 .

[0052] Fig.11 The structure of the device of the present invention is shown in FIG. Figure 2 .

[0053] Fig.12 for Fig.11 Enlarged structural diagram at point C in the middle.

[0054] Fig.13 It is a schematic diagram of the longitudinal cross-sectional structure of the device of the present invention.

[0055] Fig.14 for Fig.13 The enlarged structural diagram at D in the figure.

[0056] Fig.15 for Fig.13 The enlarged structural diagram at E in FIG.

[0057] Fig.16 for Fig.10 A schematic diagram of the enlarged structure of the three-phase electrical docking assembly.

[0058] Fig.17 It is a bottom view structural schematic diagram of the three-phase electrical docking assembly of the present invention.

[0059] Numbers in the figure: 1, base; 11, avoidance groove; 2, first device; 21, platform scale; 22, lifting positioning assembly; 221, lifting fixed frame; 222, connecting base; 223, telescopic sleeve; 224, lifting plate; 2241, positioning pin; 2242, notch; 225, lifting cylinder; 226, support foot bottom plate; 227, third bolt; 228, fixing block; 229, second horizontal adjustment bolt; 23, automatic oil filling and pumping assembly; 231, fixing rod; 232, first fixed connection seat; 233, lifting cylinder; 234, linear guide; 235, first movable joint Seat; 236, oil injection and extraction butt joint; 24, height adjustment structure; 241, clamping block; 242, screw; 243, disc; 244, nut; 245, first bolt; 246, bolt hole; 25, horizontal adjustment structure; 251, arc-shaped top clamp; 252, second bolt; 253, first horizontal adjustment bolt; 26, card reader; 3, second device; 31, fixed support; 32, movable clamping assembly; 321, fixed frame; 322, first movable frame; 3221, through hole; 323, first driving cylinder; 324, hydraulic clamping mechanism; 3241, fixed Fixed seat; 3242, oil cylinder; 3243, clamping block; 3244, rotating shaft; 3245, shaft seat; 325, first slide rail; 326, stopper; 327, drag chain; 33, rotating drive assembly; 331, second movable frame; 332, first servo motor; 333, second servo motor; 334, telescopic assembly; 3341, rotating shaft; 3342, coupling; 3343, stopper; 3344, first spring; 3345, gap; 335, docking sleeve; 336, second slide rail; 337, gear; 338, rack; 339, rotating bearing structure; 34 , three-phase electrical docking assembly; 341, fixed bracket; 342, second drive cylinder; 343, mounting plate; 3431, rib plate; 3432, fixed plate; 344, nylon connecting plate; 345, docking structure; 3451, guide bar; 3452, connecting shaft; 3453, second spring; 3454, docking copper sleeve; 346, second fixed connecting seat; 347, second movable connecting seat; 348, slide seat; 349, third slide rail; 4, back-electromotive force zero point measuring instrument; 5, multi-speed electric drive assembly controller; 6, tray; 7, multi-speed electric drive assembly; 8, conveyor roller; 9, switch assembly. DETAILED DESCRIPTION

[0060] In order to enable those skilled in the art to better understand the technical solution of the present invention, the preferred implementation scheme of the present invention is described below in conjunction with specific embodiments. However, it should be understood that the drawings are only used for exemplary description and cannot be understood as a limitation on this patent. In order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. The positional relationship described in the drawings is only for exemplary description and cannot be understood as a limitation on this patent.

[0061] This embodiment provides a method for detecting an online back-EMF zero point of a multi-speed electric drive assembly, comprising the following steps:

[0062] 1) Preparation and transportation:

[0063] The multi-speed electric drive assembly 7 and the tray 6 are placed on the conveying roller 8. The conveying roller 8 continuously conveys the tray 6 and the multi-speed electric drive assembly 7 to the inspection station.

[0064] 2) Lifting and positioning:

[0065] At the inspection station, the tray 6 carrying the multi-speed electric drive assembly 7 is lifted and accurately positioned by the lifting and positioning assembly 22. The lifting and positioning assembly 22 ensures the stability of the tray 6 and the multi-speed electric drive assembly 7 during the inspection process.

[0066] 3) Initial weight record:

[0067] The initial weight of the pallet 6 and the multi-speed electric drive assembly 7 after lifting and positioning is recorded using a platform scale 21. This step provides a benchmark for subsequent lubricating oil filling or extraction.

[0068] 4) Lubricating oil filling or extraction:

[0069] The lubricating oil is added or extracted to the multi-speed electric drive assembly 7 by the automatic oil filling and oil extraction assembly 23. The weight after the filling or extraction is monitored and recorded to ensure that the weight of the lubricating oil remaining in the multi-speed electric drive assembly 7 reaches the designed value.

[0070] 5) Clamping and power on:

[0071] The movable clamping assembly 32 is used to clamp and position the multi-speed electric drive assembly 7. At the same time, the three-phase copper busbar on the multi-speed electric drive assembly 7 is docked through the three-phase electrical docking assembly 34 to complete the power-on preparation.

[0072] 6) Rotation and detection:

[0073] The rotation drive assembly 33 is connected to the spline shaft of the multi-speed electric drive assembly 7 and drives it to rotate at a stable speed. During the rotation process, the back electromotive force and zero point measuring instrument is used to detect the back electromotive force and zero point of the multi-speed electric drive assembly 7.

[0074] 7) As required, the multi-speed electric drive assembly controller 5 controls the oil pump startup and gear shifting operations to detect the back electromotive force and zero point at different gears.

[0075] 8) Data recording and storage:

[0076] Record and store the test data to complete the test process. The test data includes but is not limited to the back EMF value, zero point position, and performance parameters at different gears.

[0077] This embodiment provides a detection device adapted to the above detection method. For the measurement of the back-EMF zero point of the multi-speed electric drive assembly, according to its measurement requirements, the back-EMF zero point of the motor needs to be measured under the premise that the motor rotor is stable at a certain speed and time. For the multi-speed electric drive assembly, due to the complex structure of the multi-speed electric drive assembly (2 sets of motors), the large number of shaft systems, and the influence of the product assembly process and beat, if the above rotor speed requirements are to be met, this equipment needs to have at least the following functions and devices:

[0078] (1) Lubricating oil filling / extraction function, used to ensure that the shaft system of the multi-speed electric drive assembly is lubricated with oil during high-speed rotation to avoid product damage caused by dry grinding of the shaft system; (2) Lubricating oil filling automatic docking function, used to ensure that different pallets and multi-speed electric drive assemblies can automatically complete the automatic docking of lubricating oil filling when they arrive at the workstation of this equipment; (3) High-precision weighing device, used to weigh the products before lubricating oil filling and after lubricating oil extraction at this workstation, and then obtain the accurate weight of lubricating oil remaining in the product, and bind this data to the product to facilitate the subsequent operation and management of subsequent products. (4) Stable shaft system docking device and rotation device, used to automatically dock with the spline shaft extended by the multi-speed electric drive and drive the shaft system and motor rotor to rotate at high speed and stability. (5) Oil pump starting and automatic shifting device. Because the multi-speed electric drive product has two motors and multiple shaft systems, and when the shaft system drives the motor to rotate, only one of the motors can be driven to rotate. If the other motor needs to be driven to rotate, the gear must be shifted first. In addition, if the lubricating oil is required to lubricate normally, the oil pump of the product needs to be started. Therefore, the product needs to be connected to the power supply and the shift motor needs to be controlled and shifted. (6) Hydraulic clamping device, used to position and clamp the multi-speed electric drive assembly to prevent the vibration of the rotor and shaft system of the multi-speed electric drive assembly during high-speed rotation and detection from causing adverse effects on the pallet and roller. (7) Back-EMF and zero point measurement device, used to detect the back-EMF and zero point of the motor that is stable at a certain speed.

[0079] See also Figure 1-Figure 2 This embodiment provides an online back-EMF zero point detection device for a multi-speed electric drive assembly with a compact structure, high detection efficiency, reliable detection data and no adverse effects on the product, including a base 1, a first device 2, a second device 3, a back-EMF zero point measuring instrument 4, a multi-speed electric drive assembly controller 5, and is also equipped with a hydraulic station, an electric cabinet and a lubricating oil filling machine. The device integrates multiple functions such as positioning, lifting, automatic oil filling and pumping, clamping, rotary docking, three-phase electrical docking and back-EMF zero point detection. It has a compact overall structure, a small footprint, reliable data detection, complete functions, and no adverse effects on the product detection process. The device allows users to avoid using large-scale equipment for offline test benches, greatly reducing the space required for assembly lines, investment costs, and significantly improving the detection efficiency and detection quality of such assembly lines. The online detection equipment can also be promoted for back-EMF detection of various types of multi-speed electric drive assemblies. Through the multi-speed electric drive assembly controller and the back-EMF zero point measuring instrument, the oil pump operation and gear shifting operation of the multi-speed electric drive assembly can be accurately controlled, and the back-EMF and zero point data can be detected in real time to ensure the accuracy and reliability of the test results.

[0080] The first device 2 includes a platform scale 21, a lifting and positioning assembly 22, an automatic oil filling and pumping assembly 23 and a card reader 26. A large avoidance groove 11 is provided on the top of the base 1, and the platform scale 21 is installed in the avoidance groove 11, and the position of the platform scale 21 relative to the avoidance groove 11 in the height and horizontal direction is adjustable; the lifting and positioning assembly 22 is installed on the top of the platform scale 21, and the lifting and positioning assembly 22 is used to position and lift the tray 6 and the multi-speed electric drive assembly 7; the automatic oil filling and pumping assembly 23 is installed on the base 1, and the automatic oil filling and pumping assembly 23 is used to fill and pump oil from the multi-speed electric drive assembly 7 positioned on the lifting and positioning assembly 22.

[0081] In some examples, four height adjustment structures 24 for adjusting the height position of the platform scale 21 are installed on the bottom surface of the platform scale 21, and four horizontal adjustment structures 25 for adjusting the horizontal position of the platform scale 21 are installed in the avoidance groove 11. The height adjustment structure 24 and the horizontal adjustment structure 25 are arranged in a one-to-one correspondence. The position of the platform scale in the height and horizontal directions is adjustable. Through the height adjustment structure and the horizontal adjustment structure, the position of the platform scale can be accurately adjusted to ensure the accuracy of weighing, while increasing the flexibility and adaptability of the device. The horizontal position of the lifting and positioning assembly's lifting and fixing frame relative to the connecting base is also adjustable, so that when fine-tuning is required according to the on-site conditions later, there is no need to adjust the platform scale, because the platform scale is a high-precision detection device, which has high requirements for the position and horizontal position. Once the platform scale is installed and adjusted, it is not recommended to adjust it again.

[0082] For details, please refer to Figure 7 and Figure 8The height adjustment structure 24 includes a clamping block 241, a screw rod 242 is provided through the middle of the clamping block 241, the top of the screw rod 242 is threadedly connected to the bottom of the platform scale 21, a nut 244 and a disc 243 are fixed to the bottom of the screw rod 242 below the clamping block 241, and bolt holes 246 are provided on both sides of the clamping block 241. A first bolt 245 fixed in the avoidance groove 11 is installed in the bolt hole 246, and the hole diameter of the bolt hole 246 is larger than the diameter of the first bolt 245. Among them, the screw rod 242, the nut 244 and the disc 243 are integrally formed, and the screw rod 242 is driven to be screwed in or out of the platform substrate by rotating the nut 244, so as to adjust the height of the platform scale 21. The hole diameter of the bolt hole 246 is larger than the diameter of the first bolt 245. Such a design can increase the horizontal activity space of the clamping block 241, thereby providing necessary conditions for adjusting the horizontal position of the platform scale 21. The height adjustment structure 24 achieves precise adjustment of the height position of the platform scale 21 through components such as the screw rod 242, the nut 244 and the disc 243, and has simple operation and a wide adjustment range.

[0083] For details, please refer to Figure 7 and Figure 8 The horizontal adjustment structure 25 includes an arc-shaped tightening block 251, which is fixed in the avoidance groove 11 by a second bolt 252. The arc-shaped tightening block 251 is penetrated by a plurality of first horizontal adjustment bolts 253 of different angles in the horizontal direction. The first horizontal adjustment bolts 253 can be adjusted to be in tight contact with the outer cylindrical surface of the disc 243. By rotating the first horizontal adjustment bolts 253 at different angles, the disc 243 can be controlled to move in different directions, thereby adjusting the position of the platform scale 21 on the water surface. After the final height and horizontal position are adjusted, the clamping block 241 and the first bolt 245 are used to clamp the platform scale 21 to prevent it from tilting or being pulled upward. The above-mentioned horizontal adjustment structure 25 realizes the precise adjustment of the horizontal position of the platform scale 21 through the arc-shaped tightening block 251, the first horizontal adjustment bolts 253 and other components, and ensures the stability of the device in the horizontal direction.

[0084] For some examples, see Figure 4 and Figure 5The lifting and positioning assembly 22 includes a lifting and fixing frame 221. A connection hole is pre-processed on the weighing surface of the platform scale 21. The connection base 222 of the lifting and positioning assembly 22 is connected to the platform scale 21 through the connection hole. A lifting plate 224 is installed above the lifting and fixing frame 221 through a telescopic sleeve 223. A lifting cylinder 225 for driving the lifting plate 224 to rise and fall is installed on the lifting and fixing frame 221. A switch assembly 9 for detecting the lifting position of the lifting plate 224 is installed on the lifting and fixing frame 221, so as to realize the automation of this set of devices. A positioning pin 2241 for positioning the tray 6 is installed on the top surface of the lifting plate 224. The above-mentioned lifting and positioning assembly 22 includes components such as the lifting and fixing frame 221, the lifting plate 224, and the lifting cylinder 225. Through the coordinated work of these components, the positioning and lifting of the tray 6 and the multi-speed electric drive assembly 7 are realized, and the degree of automation of the device is improved.

[0085] For some examples, see Figure 3 A card reader 26 is installed on the lifting fixed frame 221 for reading and writing the tag carrier on the pallet 6. The pallet 6 is provided with a tag carrier, which can store certain data, such as the specific number of the product on the pallet 6 and various production information (such as tightening, gluing, oiling, weight, etc.). The cooperation of the tag carrier and the card reader 26 can realize the identification of the product at each workstation on the assembly line and complete the record of the assembly process of the product at this workstation.

[0086] In some examples, the horizontal position of the lifting and fixing frame 221 relative to the connecting base 222 is adjustable, which further increases the flexibility and adaptability of the device and can meet the needs of multi-speed electric drive assemblies 7 of different sizes and shapes.

[0087] For details, please refer to Figure 6 A large hole is provided on the foot plate 226 at the bottom of the lifting fixed frame 221. The foot plate 226 is connected to the threaded hole on the connecting base 222 through the large hole by a third bolt 227. The diameter of the large hole is larger than the diameter of the third bolt 227. The fixing form of the large hole can ensure that the lifting positioning frame has a certain amount of adjustment in the horizontal direction. The connecting base 222 outside the foot plate 226 is installed with a fixing block 228 in both vertical directions. The fixing block 228 is horizontally threaded with a second horizontal adjustment bolt 229. The second horizontal adjustment bolt 229 can be adjusted to be in tight contact with the foot plate 226. The lifting positioning frame can be adjusted and tightened to a certain extent by the horizontal adjustment bolt. The above settings ensure that the lifting positioning frame can have a certain adjustment function in all horizontal directions.

[0088] For some examples, see Fig. 9The automatic oil injection and pumping assembly 23 includes a fixed rod 231, which is installed on the base 1 and passes through the inside of the lifting and positioning assembly 22. A lifting cylinder 233 and a linear guide 234 are installed on the fixed rod 231 through a first fixed connecting seat 346232. An oil injection and pumping docking joint 236 is slidably connected to the linear guide 234 through a first movable connecting seat 235. The lifting cylinder 233 is drivingly connected to the first movable connecting seat 235. A switch assembly 9 for detecting the lifting position of the oil injection and pumping docking joint 236 is installed on the first fixed connecting seat 346232, so as to realize the automation of this device; a notch 2242 for lifting and docking the oil injection and pumping docking joint 236 is provided on the lifting plate 224 at the top of the lifting and positioning assembly 22. The above-mentioned automatic oil filling and pumping assembly 23 includes components such as a fixed rod 231, a lifting cylinder 233, a linear guide rail 234 and an oil filling and pumping joint 236. Through the coordinated work of these components, automatic oil filling and pumping of the multi-speed electric drive assembly 7 are realized, thereby improving the degree of automation of the production line.

[0089] Specifically, the oil filling and oil extraction docking joint 236 is connected to a lubricating oil filling machine through a pipeline. The lubricating oil filling machine is placed on the ground near the standby base 1. The filling machine contains a lubricating oil filling system, a lubricating oil extraction system, a clean oil tank, a dirty oil tank, a filtering system and a liquid replenishing system, which can realize quantitative filling of lubricating oil and filtering and recovery of lubricating oil. When the amount of lubricating oil in the clean oil tank is insufficient, an alarm message can be issued and clean lubricating oil can be automatically extracted from a nearby oil barrel for replenishment. The oil filling and oil extraction docking joint 236 can be designed as a floating quick-connect connector (female head). Before this workstation, a corresponding quick-connect connector (male head) facing vertically downward has been manually installed on the multi-speed electric drive assembly 7. When the multi-speed electric drive assembly 7 enters this workstation and is positioned along with the tray 6, the quick-connect connector (female head) will, under the push of the lifting cylinder 233, pass through the notch 2242 on the lifting plate 224 and the avoidance hole reserved on the tray 6 to automatically dock and lock with the quick-connect connector (male head) on the multi-speed electric drive assembly 7. Subsequently, driven by the lubricating oil filling machine, accurate quantitative automatic oil filling and subsequent automatic oil extraction of the product can be realized in this workstation, and the docking process of the quick-connect connector (female head) and the quick-connect connector (male head) is accurate and reliable, and there is no oil leakage during the plugging and unplugging process.

[0090] In some examples, the automatic oil filling and pumping assembly 23 is staggered in height space with the platform scale 21 and the lifting and positioning assembly 22. Through reasonable design, the automatic oil filling and pumping assembly 23 is staggered in height space with the platform scale 21 and the lifting and positioning assembly 22, avoiding mutual interference and improving the compactness and space utilization of the device.

[0091] In the above structural design, the lifting and positioning assembly can automatically position and lift the pallet and the multi-speed electric drive assembly, thereby improving production efficiency. The automatic oil filling and pumping assembly can automatically fill and pump oil from the multi-speed electric drive assembly positioned on the lifting and positioning assembly, thereby reducing manual intervention and improving operation efficiency and accuracy. The card reader installed on the lifting fixed frame can read the code carrier information on the pallet to achieve intelligent management and traceability. The lifting and positioning assembly and the automatic oil filling and pumping assembly are both equipped with switch assemblies to detect the position status and ensure the accuracy and safety of the operation process.

[0092] After the above three sets of components are integrated, the lifting and positioning component 22 can realize the precise positioning of the tray 6 and the multi-speed electric drive assembly 7. The objects weighed by the high-precision platform scale 21 are actually the weight of the lifting and positioning component 22, the weight of the tray 6 and the weight of the multi-speed electric drive assembly 7, wherein the weight of the automatic oil filling and pumping component 23 is not included in the weighing system. The automatic oil filling and pumping component 23 can normally fill and pump oil to the multi-speed electric drive assembly 7, and the weight of the residual lubricating oil in the multi-speed electric drive assembly 7 after filling and pumping can be calculated by the difference between the two weighings of the weighing system. After the whole set of equipment is installed, when the tray 6 with the multi-speed electric drive assembly 7 is transported from the conveyor roller 8 to this station, the lifting and positioning component 22 first lifts the tray 6 and the multi-speed electric drive assembly 7. When the tray 6 and the multi-speed electric drive assembly 7 are lifted by the lifting and positioning component 22, the platform scale 21 records the weight of all the devices on it at this time. The platform scale 21 will record the weight of all the devices on it again after the final product is automatically filled with lubricating oil and automatically extracted with lubricating oil. The difference between the weight of the second weighing and the weight of the first weighing is the weight of the lubricating oil remaining in this product when it is working at this station. This data will be recorded in the data chain of this product through the reading and writing of the code body, and used for the subsequent operation of the product. The device can automatically fill and extract oil for the products entering this station, and can monitor and record the weight before and after filling and extracting oil. The device has a compact structure, complete functions, convenient adjustment and maintenance, and reliable weight data detection.

[0093] See also Fig.10 and Fig.11 The second device 3 includes a fixed support 31, a movable clamping assembly 32, a rotary drive assembly 33 and a three-phase electrical docking assembly 34. The movable clamping assembly 32 is used to clamp the multi-speed electric drive assembly 7, the rotary drive assembly 33 is used to dock with the spline shaft on the multi-speed electric drive assembly 7, and the three-phase electrical docking assembly 34 is used to dock with the three-phase copper busbar on the multi-speed electric drive assembly 7. The overall structure of the device is compact, the layout is reasonable, the clamping is stable, the rotary docking is reliable, and the automatic docking of three-phase electricity can be performed. The device can greatly reduce the space required for such equipment and improve the reliability of the docking process. The device is particularly suitable for the automatic detection station or test bench of the assembly line of the multi-speed electric drive assembly 7.

[0094] In some examples, the movable clamping assembly 32 includes a fixed frame 321 installed on the top of the fixed support 31, a first movable frame 322 slidably connected to the top of the fixed frame 321, a first driving cylinder 323 for driving the first movable frame 322 to slide forward and backward relative to the fixed frame 321, and a hydraulic clamping mechanism 324 installed on the first movable frame 322 and used to clamp the multi-speed electric drive assembly 7.

[0095] The first slide rail 325 is installed on the top of the fixed frame 321, and limiters 326 are installed at both the front and rear ends of the first slide rail 325; the first driving cylinder 323 is installed on the side of the fixed frame 321, and the output end of the first driving cylinder 323 is connected to the first movable frame 322 for driving, and a drag chain 327 is installed between the fixed frame 321 and the first movable frame 322. Fig.15 A plurality of hydraulic clamping mechanisms 324 are arranged circumferentially on the front end surface of the first movable frame 322. Each hydraulic clamping mechanism 324 includes a fixed seat 3241 installed on the front end surface of the first movable frame 322, an oil cylinder 3242 installed on the fixed seat 3241, and a clamping block 3243 with one end drivingly connected to the oil cylinder 3242. The middle part of the clamping block 3243 is rotatably connected to the fixed seat 3241 through a rotating shaft 3244 and an axle seat 3245. The oil cylinder 3242 uses hydraulic pressure as a power source. The hydraulic clamping force is greater than the cylinder force, which ensures the stability of the multi-speed electric drive assembly 7 when the shaft system of the multi-speed electric drive assembly 7 is dragged at high speed during the subsequent detection process. A switch assembly 9 is also provided on the fixed seat 3241 for detecting the position and state of the clamping block 3243.

[0096] According to the posture of the multi-speed electric drive assembly 7 on the pallet 6 and the conveying direction of the pallet 6 on the conveyor roller 8, the whole set of equipment is arranged on the side of the conveyor roller 8, and the positioning pin 2241 on the pallet 6 is inserted into the positioning hole on the multi-speed electric drive assembly 7. When the multi-speed electric drive assembly 7 enters the inspection station along with the pallet 6, the hydraulic clamping mechanism 324 abuts against the multi-speed electric drive assembly 7 under the action of the first driving cylinder 323 and the first slide rail 325 below. Subsequently, the clamping block 3243 of the hydraulic clamping mechanism 324 is pushed and pulled by the hydraulic cylinder 3242, and the clamping block 3243 tightly hooks the protruding surface on the multi-speed electric drive assembly 7, thereby clamping and locking the multi-speed electric drive assembly 7.

[0097] In some examples, after the multi-speed electric drive assembly 7 is clamped and locked by the above-mentioned movable clamping assembly 32, in order to complete the dragging of the internal shaft system of the multi-speed electric drive assembly 7, a set of rotating drive components 33 that can rotate and drag the shaft system is required. Fig.13The rotation drive assembly 33 includes a second movable frame 331 slidably connected to the first movable frame 322, a first servo motor 332 for driving the second movable frame 331 to slide forward and backward relative to the first movable frame 322, and a second servo motor 333 installed on the second movable frame 331. The front end of the output end of the second servo motor 333 is connected to a docking sleeve 335 for docking with the spline shaft on the multi-speed electric drive assembly 7 through a telescopic assembly 334. The first movable frame 322 is provided with a through hole 3221 for the docking sleeve 335 to pass through.

[0098] The first movable frame 322 is provided with a second slide rail 336 on the top thereof; the first servo motor 332 is provided on the first movable frame 322, and the output end of the first servo motor 332 is connected to the second movable frame 331 through a gear 337 and a rack 338, see Fig.12 The second servo motor 333 is installed on the second movable frame 331 through the rotating shaft 3341 bearing structure 339, and the output end of the second servo motor 333 is connected to the docking sleeve 335 through the telescopic component 334. For details, please refer to Fig.14 The telescopic assembly 334 includes a rotating shaft 3341, one end of which is connected to the output end of the second servo motor 333 through a coupling 3342, and the other end is connected to a docking sleeve 335; a limit plate 3343 is installed in the middle of the rotating shaft 3341, a first spring 3344 is sleeved on the rotating shaft 3341 between the limit plate 3343 and the coupling 3342, and a gap 3345 is provided between the inner end of the rotating shaft 3341 and the inside of the coupling 3342. A switch assembly 9 is also provided on the bearing structure 339 of the rotating shaft 3341, which is used to detect the telescopic position and state of the rotating shaft 3341.

[0099] Under the action of the first servo motor 332, the rotational force of the first servo motor 332 can be changed into a stable forward and backward driving force of the other mechanisms through the conversion of the gear 337, the rack 338 and the second slide rail 336. The forward and backward driving first servo motor 332 is used to provide a precise and stable forward and backward driving force to the second servo motor 333, and the second servo motor 333 is used to provide the angle rotation force required for the spline docking process and subsequently provide a continuous and stable multi-speed electric drive assembly 7 shaft system rotation force. Among them, the second servo motor 333, the rotating shaft 3341, the first spring 3344 and the docking sleeve 335 are all fixed on the rotating shaft 3341 bearing structure 339, and the tolerance range of each part is matched to ensure that the final docking sleeve 335 can have a certain floating space in the axial and radial directions, and ensure that the docking sleeve 335 and the docking spline shaft on the multi-speed electric drive assembly 7 can be reliably docked, which greatly improves the success rate of spline docking.

[0100] For some examples, see Fig.16 and Fig.17The three-phase electrical docking assembly 34 includes a fixed bracket 341 mounted on the first movable frame 322, a second driving cylinder 342 mounted on the fixed bracket 341, a mounting plate 343 slidably connected to the bottom of the fixed bracket 341, and a docking structure 345 mounted on the mounting plate 343, wherein the mounting plate 343 is drivingly connected to the output end of the second driving cylinder 342. The second driving cylinder 342 is mounted on the fixed bracket 341 through a second fixed connection seat 346232, and the output end of the second driving cylinder 342 is drivingly connected to the mounting plate 343 through a second movable connection seat 347; a sliding seat 348 is mounted below the fixed bracket 341, and a third slide rail 349 is slidably connected below the sliding seat 348, and the third slide rail 349 is fixedly connected to the mounting plate 343; the mounting plate 343 is fixedly connected to the third slide rail 349 through a rib plate 3431 and a fixed plate 3432. By pushing the second driving cylinder 342 and the third slide rail 349, the docking copper sleeve 3454 and other movable connecting parts can be extended and retracted to complete the docking with the three-phase copper busbar on the multi-speed electric drive assembly 7. A switch component 9 is also provided on the fixed bracket 341 for detecting the sliding position and state of the mounting plate 343.

[0101] The docking structure 345 includes a nylon connecting plate 344 mounted on the mounting plate 343, comb-shaped conductive bars 3451 mounted side by side on the nylon connecting plate 344, a connecting shaft 3452 mounted between two adjacent conductive bars 3451, a second spring 3453 sleeved on the connecting shaft 3452, and a docking copper sleeve 3454 mounted on the head of the connecting shaft 3452. The nylon connecting plate 344 is an insulating non-metallic part, and the conductive current is mainly conducted by the connecting shaft 3452 and the docking copper sleeve 3454. In order to avoid short circuit and open circuit, the nylon connecting plate 344 is provided with comb-shaped conductive bars 3451 to ensure the guidance and isolation between the conductive parts. In order to avoid the uneven and unreliable fitting surface between the docking copper busbar and the three-phase copper busbar of the multi-speed electric drive assembly 7, a second spring 3453 is arranged on the connecting shaft 3452 and the dimensions of the various parts are matched to ensure that the docking copper sleeve 3454 has floating angles and a certain spring pressure during the fitting process with the multi-speed electric drive assembly 7, thereby ensuring that the docking surface of the copper sleeve and the three-phase copper busbar on the multi-speed electric drive assembly 7 can fit tightly.

[0102] In the above structural design, the hydraulic clamping mechanism uses hydraulic pressure as the power source, with large clamping force and good stability, ensuring the stability of the multi-speed electric drive assembly during the rotation and dragging process. The docking sleeve in the rotary drive assembly has a certain floating space in the axial and radial directions, ensuring that it can be reliably docked with the spline shaft on the multi-speed electric drive assembly, and improving the success rate of spline docking. The docking copper sleeve in the three-phase electric docking assembly is matched by spring pressure and size to ensure a close fit with the three-phase copper busbar on the multi-speed electric drive assembly, avoiding the occurrence of short circuits and open circuits.

[0103] During actual operation, the first movable frame 322 and all devices thereon are pushed forward by the first driving cylinder 323, and the clamping of the multi-speed electric drive assembly 7 is completed by the hydraulic clamping mechanism 324. The second servo motor 333 is pushed forward by the first servo motor 332 and the spline shaft of the multi-speed electric drive assembly 7 is docked. After the docking is completed, the shaft system and the motor rotor in the multi-speed electric drive assembly 7 are dragged by the second servo motor 333 to rotate at a certain speed, so as to facilitate the subsequent measurement of the back electromotive force and zero point of the motor. In addition, the three-phase electric docking assembly 34 also contains the second driving cylinder 342, the third slide rail 349 and the second spring 3453. After the hydraulic clamping mechanism 324 completes the clamping of the multi-speed electric drive assembly 7, the second driving cylinder 342 in the three-phase electric docking assembly 34 can be started to complete the docking of the three-phase copper bar on the multi-speed electric drive assembly 7, thereby completing the energized docking of the two stators in the motor.

[0104] The electric cabinet is directly fixed on the base 1, which is convenient for the overall installation, debugging and equipment transportation of the equipment. The back-electromotive force zero point measuring instrument 4 and the multi-speed electric drive assembly controller 5 are directly fixed on the base 1 through the bracket. The back-electromotive force zero point measuring instrument 4 needs to manually connect the signal line to the signal interface on the product for measurement. Because the multi-speed electric drive product has two motors and multiple sets of shaft systems, and only one of the motors can be driven to rotate when the motor is driven to rotate by the shaft system, if the other motor needs to be driven to rotate, it is necessary to shift gears first. In addition, if the lubricating oil needs to be lubricated normally, the oil pump of the product needs to be started. Therefore, it is necessary to connect the product to electricity and control the shifting motor and shift gears; the multi-speed electric drive assembly controller 5 uses the controller on the assembly line product, and the PLC of this station can realize the operation requirements of starting the oil pump in the product and shifting gears during the measurement process through the connection and control of the controller and the multi-speed electric drive assembly 7. The hydraulic station is directly installed on the base 1 to control the clamping and loosening of the oil cylinder 3242 on the hydraulic clamping mechanism 324.

[0105] From the above description, it can be seen that the beneficial effects of the present invention are:

[0106] (1) A high-precision platform scale and its reasonable installation structure are set up to automatically monitor and record the weight of the product before and after testing, which greatly improves the data traceability of this testing equipment. (2) An automatic oil filling and pumping component and an automatic three-phase electrical docking component are set up, which greatly improves the automation level of this testing equipment. (3) A high-strength hydraulic clamping mechanism is set up to reduce the adverse effects of product vibration on the equipment during the test. (4) A rotation drive component with a clever structure and extremely high precision is set up. This device greatly guarantees the docking success rate of the spline shaft and the docking sleeve and ensures the precise control of the stable speed of different motors in different gears. (5) The product's own controller is cleverly used as a carrier, making it possible for the equipment to control the product's oil pump motor and shift gears through PLC, greatly simplifying the development of the equipment's software and program.

[0107] In summary, the present invention provides a method for detecting the online back-EMF zero point of a multi-speed electric drive assembly. Through the reasonable coordination and application of platform scales, lifting and positioning components, automatic oil filling and pumping docking components, hydraulic clamping mechanisms, three-phase electrical docking components, rotary drive components and corresponding back-EMF zero point measuring instruments, multi-speed electric drive assembly controllers, hydraulic stations, lubricating oil filling machines and other devices, the online back-EMF and zero point measurement of the multi-speed electric drive assembly can be achieved. The whole set of equipment involved in the method has a compact structure, complete functions, small footprint, reliable data detection, and the detection process has no adverse effects on the product and equipment. The use of this method greatly improves the detection efficiency of back-EMF zero point detection on the multi-speed electric drive assembly assembly line, optimizes its detection process, and greatly improves its detection reliability.

[0108] According to the description and drawings of the present invention, those skilled in the art can easily manufacture or use the online back-electromotive force zero point detection method of the multi-speed electric drive assembly of the present invention, and can produce the positive effects recorded in the present invention. The present invention has been applied to the pallet of the engine assembly line in the automotive industry.

[0109] Unless otherwise specified, in the present invention, the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicating orientation or positional relationships are based on the orientation or positional relationships shown in the drawings, which 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 operate in a specific orientation. Therefore, the terms describing the orientation or positional relationship in the present invention are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood in conjunction with the drawings and according to specific circumstances.

[0110] Unless otherwise clearly specified and limited, in the present invention, the terms "disposed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0111] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A method for detecting the zero point of the online back electromotive force of a multi-speed electric drive assembly, characterized in that: The following steps are involved: Placing the multi-speed electric drive assembly (7) and the tray (6) on a conveying roller (8) and conveying them to a testing station; Lift and position the tray (6) carrying the multi-speed electric drive assembly (7); Recording the initial weight of the pallet (6) and the multi-speed electric drive assembly (7) after lifting and positioning; Filling or extracting lubricating oil from the multi-speed electric drive assembly (7), monitoring and recording the weight after filling or extracting, and calculating the difference so that the weight of the lubricating oil remaining in the multi-speed electric drive assembly (7) reaches the designed value; Clamping and positioning the multi-speed electric drive assembly (7); Powering on and connecting the multi-speed electric drive assembly (7); Docking with the spline shaft of the multi-speed electric drive assembly (7) and driving it to rotate at a stable speed; During the rotation process, the back electromotive force and the zero point of the multi-speed electric drive assembly (7) are detected; Record and store test data to complete the test process.

2. The method for detecting the online back-electromotive force zero point of a multi-speed electric drive assembly according to claim 1, characterized in that: The back-electromotive force zero point detection device is used to detect the online back-electromotive force zero point of the multi-speed electric drive assembly, and the back-electromotive force zero point detection device comprises a base (1) installed at a detection station and a platform scale (21), a lifting and positioning component (22) and an automatic oil filling and pumping component (23) integrated on the base (1); a tray (6) carrying the multi-speed electric drive assembly (7) is lifted and positioned by the lifting and positioning component (22); the initial weight of the tray (6) and the multi-speed electric drive assembly (7) after lifting and positioning is recorded by the platform scale (21), and the weight after filling or pumping is monitored and recorded; and lubricating oil is filled or pumped into the multi-speed electric drive assembly (7) by the automatic oil filling and pumping component (23).

3. The method for detecting the online back-electromotive force zero point of a multi-speed electric drive assembly according to claim 2, characterized in that: The platform scale (21) is installed in the avoidance groove (11) at the top of the base (1), and the position of the platform scale (21) in the height and horizontal directions relative to the avoidance groove (11) is adjustable; a height adjustment structure (24) for adjusting the height position of the platform scale (21) is installed on the bottom surface of the platform scale (21); and a horizontal adjustment structure (25) for adjusting the horizontal position of the platform scale (21) is installed in the avoidance groove (11).

4. The method for detecting the online back-EMF zero point of a multi-speed electric drive assembly according to claim 2, characterized in that: The lifting and positioning assembly (22) comprises a lifting and fixing frame (221), wherein the lifting and fixing frame (221) is fixed to the platform scale (21) via a connecting base (222), a lifting plate (224) is installed above the lifting and fixing frame (221) via a telescopic sleeve (223), a lifting cylinder (225) for driving the lifting plate (224) to rise and fall is installed on the lifting and fixing frame (221), and a positioning pin (2241) for positioning the tray (6) is installed on the top surface of the lifting plate (224); the horizontal position of the lifting and fixing frame (221) relative to the connecting base (222) is adjustable.

5. The method for detecting the online back-EMF zero point of a multi-speed electric drive assembly according to claim 2, characterized in that: The automatic oil injection and pumping assembly (23) comprises a fixed rod (231), the fixed rod (231) is mounted on the base (1) and passes through the inside of the lifting and positioning assembly (22), a lifting cylinder (233) and a linear guide rail (234) are mounted on the fixed rod (231) via a first fixed connection seat (232), an oil injection and pumping docking joint (236) is slidably connected to the linear guide rail (234) via a first movable connection seat (235), the lifting cylinder (233) is drivingly connected to the first movable connection seat (235), and a notch (2242) is provided at the top of the lifting and positioning assembly (22) for the oil injection and pumping docking joint (236) to be lifted and docked; the automatic oil injection and pumping assembly (23) and the platform scale (21) and the lifting and positioning assembly (22) are staggered in height space.

6. The method for detecting the online back-EMF zero point of a multi-speed electric drive assembly according to claim 2, characterized in that: The back-electromotive force zero point detection device further comprises a movable clamping assembly (32), a rotary drive assembly (33) and a three-phase electrical docking assembly (34) integrated on the base (1); the movable clamping assembly (32) is used to clamp and position the multi-speed electric drive assembly (7); the rotary drive assembly (33) is used to dock with the spline shaft of the multi-speed electric drive assembly (7) and drive it to rotate at a stable speed; and the three-phase copper busbar on the multi-speed electric drive assembly (7) is docked via the three-phase electrical docking assembly (34).

7. The method for detecting the online back-EMF zero point of a multi-speed electric drive assembly according to claim 6, characterized in that: The movable clamping assembly (32) is mounted on the base (1) via a fixed support (31), and the movable clamping assembly (32) comprises a fixed frame (321) mounted on the top of the fixed support (31), a first movable frame (322) slidably connected to the top of the fixed frame (321), a first driving cylinder (323) for driving the first movable frame (322) to slide forward and backward relative to the fixed frame (321), and a hydraulic clamping mechanism (323) mounted on the first movable frame (322) and used for clamping the multi-speed electric drive assembly (7). 324); a plurality of the hydraulic clamping mechanisms (324) are circumferentially arranged on the front end surface of the first movable frame (322), each of the hydraulic clamping mechanisms (324) comprising a fixed seat (3241) mounted on the front end surface of the first movable frame (322), an oil cylinder (3242) mounted on the fixed seat (3241), and a clamping block (3243) having one end drivingly connected to the oil cylinder (3242), and a middle portion of the clamping block (3243) is rotatably connected to the fixed seat (3241) via a rotating shaft (3244) and an axle seat (3245).

8. The method for detecting the online back-EMF zero point of a multi-speed electric drive assembly according to claim 6, characterized in that: The rotary drive assembly (33) comprises a second movable frame (331) slidably connected to the first movable frame (322), a first servo motor (332) for driving the second movable frame (331) to slide forward and backward relative to the first movable frame (322), and a second servo motor (333) mounted on the second movable frame (331), wherein an output end of the second servo motor (333) is connected to a docking sleeve (335) for docking with a spline shaft on a multi-speed electric drive assembly (7) via a telescopic assembly (334), and a first movable frame (322) is provided with a first servo motor (332) for the docking sleeve (335) to be connected to the first movable frame (322). ) passes through a through hole (3221) through which the telescopic component (334) passes; the telescopic component (334) includes a rotating shaft (3341), one end of the rotating shaft (3341) is connected to the output end of the second servo motor (333) through a coupling (3342), and the other end is connected to the docking sleeve (335); a limit plate (3343) is installed in the middle of the rotating shaft (3341), a first spring (3344) is sleeved on the rotating shaft (3341) between the limit plate (3343) and the coupling (3342), and a gap (3345) is provided between the inner end of the rotating shaft (3341) and the inside of the coupling (3342).

9. The method for detecting the online back-EMF zero point of a multi-speed electric drive assembly according to claim 6, characterized in that: The three-phase electrical docking assembly (34) comprises a fixed bracket (341) mounted on the first movable frame (322), a second driving cylinder (342) mounted on the fixed bracket (341), a mounting plate (343) slidably connected to the bottom of the fixed bracket (341), and a docking structure (345) mounted on the mounting plate (343), wherein the mounting plate (343) is drivingly connected to the output end of the second driving cylinder (342); the docking structure (345) comprises a nylon connecting plate (344) mounted on the mounting plate (343), comb-shaped guide bars (3451) mounted side by side on the nylon connecting plate (344), a connecting shaft (3452) mounted between two adjacent guide bars (3451), a second spring (3453) sleeved on the connecting shaft (3452), and a docking copper sleeve (3454) mounted on the head of the connecting shaft (3452).

10. The method for detecting the online back-electromotive force zero point of a multi-speed electric drive assembly according to claim 2, characterized in that: The back-electromotive force zero point detection device further comprises a back-electromotive force zero point measuring instrument (4) and a multi-speed electric drive assembly controller (5) integrated on the base (1); the back-electromotive force zero point measuring instrument (4) is used to detect the back-electromotive force and the zero point of the multi-speed electric drive assembly (7); and the oil pump start-up and gear shifting operations of the multi-speed electric drive assembly (7) are controlled by the multi-speed electric drive assembly controller (5) to detect the back-electromotive force and the zero point at different gears.

Images