Stator pressing key device and pressing method for electric drive system

Abstract

This invention relates to a stator key press-fitting device and method for an electric drive system. The device includes a vibratory feeder mechanism, a key feeding mechanism, and a pressing head mechanism. The key feeding mechanism includes a key guiding mechanism, a slide mechanism, and a key-lifting mechanism. The vibratory feeder mechanism feeds the key, which passes through the key inlet of the key guiding mechanism and is then fed into the pressing head mechanism via the slide mechanism and the key-lifting mechanism, where it is pressed into the stator keyway. This invention uses multiple sets of cylinders to form the key feeding mechanism. The vibratory feeder delivers the key to the key feeding inlet of the key feeding mechanism, and the multiple sets of cylinders drive the guide block to deliver the key into the pressing head, where the key press-fitting operation is then performed. This invention allows for long-distance key feeding while ensuring displacement accuracy, and can identify whether the key has been properly positioned, increasing the success rate of the press-fitting. The pressing head uses flexible pressing, with two sets of springs cushioning the contact surface of the product during pressing, thus solving the problem of damage or scratching of the stator core during the key press-fitting process.

Description

Technical Field

[0001] This invention belongs to the field of automotive technology and relates to a stator press-fitting flat key device and press-fitting method for an electric drive system. Background Technology

[0002] With the gradual development of the new energy vehicle industry, the demand for permanent magnet motors, as a widely used drive system in new energy vehicles, is also increasing. The assembly of flat keys is mostly done manually, a method widely used in assembly line production. In automated production lines for stator pressing of new energy vehicle electric drive systems, manual feeding is still largely used before the flat key pressing process, resulting in low automation and impacting cycle time. Manual assembly during pressing is inefficient and has a high defect rate, leading to high production costs. Previously, to address these issues, a vibratory feeder with guide slides was used to transfer the flat keys, which were then oriented by a flipping mechanism and fell into the guide mechanism where they would be pressed, finally being pressed by a servo press. However, automated pressing suffers from two main problems: First, the self-limiting nature of the device structure during automatic pressing can damage or scratch the stator core, resulting in a high defect rate and increased manufacturing costs. Second, the flipping mechanism is prone to causing the flat key to fall during the flipping process and is only suitable for short-distance key delivery.

[0003] Patent document CN214816339U discloses a servo motor key pressing fixture, including a key pressing frame and a slide rail frame vertically fixed to the key pressing frame. The slide rail frame has a slide rail, on which a bracket for fixing the servo motor is slidably connected. The key pressing frame is equipped with a positioning block for positioning the servo motor with a flat key. The key pressing frame also has a cylinder and a key pressing block. The cylinder's push rod is fixedly connected to the key pressing block, which is used to press the flat key. This patent document features a moving rail for easy movement and disassembly, and an automatic alignment mechanism to automatically align the key before pressing, avoiding damage to the key due to untimely manual alignment and the safety hazards of manual adjustment.

[0004] Patent document CN209698394U provides a motor stator keying device, including a feeding mechanism, a flipping mechanism, a flat key guiding mechanism, a pressing mechanism, a sliding mechanism, and a quick-change fixture. The feeding mechanism has a discharge port, the flipping mechanism has a rotatable mechanical gripper, and the discharge port is connected to the mechanical gripper before rotation via a guide groove. The flat key guiding mechanism has a guide hole located directly below the rotated mechanical gripper. The pressing mechanism has a downwardly movable ejector pin positioned directly above the guide hole. The sliding mechanism includes a slide plate that slides along one side of the flat key guiding mechanism and extends below the guide hole. The quick-change fixture is mounted on the slide plate and includes a motor mounting slot. This patent document achieves automated keying assembly, solves the equipment cycle time problem, reduces the labor intensity of workers, and improves assembly efficiency.

[0005] Patent document CN218335655U discloses a keying device for a motor shaft. This device includes a worktable and a keying assembly. The keying assembly includes a first mounting plate and a second mounting plate. The first mounting plate is mounted on the worktable and connected to the second mounting plate via a support rod. A sliding plate is positioned between the first and second mounting plates and slidably connected to the support rod. The keying assembly includes a pressing cylinder and a pressing head. The pressing cylinder is connected to the second mounting plate, and its movable end is connected to the upper side of the sliding plate. The pressing head is positioned on the lower side of the sliding plate and has a second keyway. An adsorption element and a check valve are provided within the second keyway. The adsorption element and the check valve cooperate to hold the key in place. When the pressing cylinder moves downwards, it presses the key from the second keyway into the first keyway on the motor shaft. This keying device for a motor shaft has a simple structure, saves time and effort, and improves the efficiency of keying. The key pressing device includes a first mounting plate and a second mounting plate. The first mounting plate is set on the worktable and connected to the second mounting plate via a support rod. A sliding plate is positioned between the first and second mounting plates and slidably connected to the support rod. The key pressing assembly includes a pressing cylinder and a pressing head. The pressing cylinder is connected to the second mounting plate, and its movable end is connected to the upper side of the sliding plate. The pressing head is positioned on the lower side of the sliding plate and has a second keyway. An adsorption element and a check element are installed in the second keyway, which cooperate to hold the key. When the pressing cylinder moves downward, it presses the key in the second keyway into the first keyway on the motor shaft. This motor shaft key pressing device has a simple structure, saves time and labor, and improves key pressing efficiency.

[0006] The aforementioned patent documents are not very relevant to this application. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to overcome the above-mentioned problems existing in the prior art, and to provide a stator press-fit flat key device and implementation method for an electric drive system.

[0008] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0009] To solve the above-mentioned technical problems, the present invention is implemented using the following technical solution:

[0010] A stator press-fit key device for an electric drive system, comprising a frame 1-1, characterized in that:

[0011] It also includes a vibratory feeder mechanism 1-2, a key feeding mechanism 1-3, and a pressure head mechanism 1-4;

[0012] The key feeding mechanism 1-3 includes a flat key guiding mechanism 2-1, a slide mechanism 2-4, a top key mechanism 2-5;

[0013] The vibratory feeder mechanism 1-2 feeds the flat key. The flat key is fed into the pressure head mechanism 1-4 through the key inlet 3-2 of the flat key guide mechanism 2-1, and then through the slide mechanism 2-4 and the top key mechanism 2-5. The flat key is pressed into the stator keyway.

[0014] The groove in the vibratory feeder mechanism 1-2 is in contact with the first guide block 3-1 in the flat key guide mechanism 2-1;

[0015] The base plate in the key guide mechanism 2-1 is threadedly connected to the L plate in the slide mechanism 2-4.

[0016] The guide rail slider in the slide mechanism 2-4 is connected to the connecting plate of the top key mechanism in the top key mechanism 2-5;

[0017] The ejector pin in the ejector key mechanism 2-5 contacts the guide block in the pressure head mechanism 1-4. The ejector pin pushes the flat key into the guide block, and the spring plunger inside the guide block retains the flat key.

[0018] Furthermore, the flat key guiding mechanism also includes a second guide block 3-3, a first guide groove 3-4, a third guide block 3-5, a sliding plate A 3-6, a second guide groove 3-7, a guide rail 3-8, a transverse cylinder 3-9, a proximity switch 3-10, a stop block 3-11, a key outlet 3-12, and a detection through-beam sensor.

[0019] The first guide block 3-1 has a countersunk hole and is threaded to the welding frame. The vibratory feeder slide will send the flat key to the key inlet 3-2 of the first guide block. The second guide block 3-3 has a first guide groove 3-4 that is threaded through and is threaded to the welding frame. The first guide block 3-1 and the second guide block 3-3 have countersunk holes and are threaded to the welding frame. The third guide block 3-5 has a countersunk hole on one side and is connected to the slide plate A 3-6. The other side has a second guide groove 3-7 that is threaded through. The slide plate A is connected to the slider of the guide rail 3-8. The side of the slide plate A is connected to the floating joint of the transverse cylinder 3-9. The two proximity switches 3-10 detect whether the screw position on the slide plate A is in place. The distance between the two proximity switches (3-10) is exactly the distance between the relative sliding of the two guide grooves. Finally, the flat key falls into the key outlet 3-12 of the stop block 3-11.

[0020] The detection sensors 3-13 are respectively installed on both sides of the second guide block to detect whether the flat key is in place.

[0021] Furthermore, the slide mechanism also includes a first transverse guide rail 4-1, a second transverse guide rail 4-2, a slide plate B4-3, a first transverse cylinder 4-4, a second transverse cylinder 4-5, a first transverse cylinder connecting plate 4-6, a floating joint block 4-7, and a connecting block 4-8;

[0022] The first transverse cylinder connecting plate 4-6 has a countersunk hole and is screwed to the welding frame. The extended joint of the first transverse cylinder 4-4 is connected to the slide plate B4-3 through the floating joint block 4-7, which drives the slide plate B4-3 to move laterally. The second transverse cylinder 4-5 is screwed to the slide plate B4-3. The extended cylinder joint of the second transverse cylinder 4-5 is connected to the top key mechanism.

[0023] Furthermore, the top key mechanism also includes a longitudinal cylinder 4-10, a fixing block 4-12, and a flat key retention port 4-13;

[0024] The connecting plate has a countersunk hole that connects to the guide rail slider, enabling the key mechanism to move laterally. The longitudinal cylinder 4-10 of the key mechanism is connected to the ejector pin. The extension and retraction of the longitudinal cylinder drives the ejector pin to move vertically up and down, pushing the flat key from the flat key retention port 4-13 of the fixed block 4-12 into the key storage groove inside the pressure head.

[0025] Furthermore, the first transverse cylinder 4-4 drives the slide plate B4-3 to move laterally, and the second transverse cylinder 4-5 extends its cylinder connector to connect with the key mechanism, realizing the transverse movement of the key mechanism. The extension and retraction of the longitudinal cylinder 4-10 of the key mechanism drives the ejector pin to move vertically up and down, pushing the flat key into the key storage groove in the pressure head.

[0026] Furthermore, the key feeding mechanism also includes a connecting plate 2-2, a welding frame 2-3, a sliding table mechanism 2-4, and a top key mechanism connecting plate 2-6;

[0027] The connecting plate 2-2 has an elongated hole and is screwed to the welding frame 2-3. The transverse sliding mechanism 2-4 is integrated with the frame by screwing and welding.

[0028] The top key mechanism connecting plate 2-6 is connected to the slider of the slide mechanism 2-4. The slider is driven to reciprocate laterally by two sets of transverse cylinders; it moves laterally by two sets of cylinder guide rails.

[0029] Furthermore, the pressure head mechanism also includes an adjusting block 5-1, a connecting shaft with a flange 5-2, a connecting plate 5-3 for the pressure head mechanism, a pressure head 5-4, a pressing block 5-5, and a sensor 5-8;

[0030] Adjusting block 5-1 is adjusted by pulling and tightening screws to adjust the position of the pressure head axis. Connecting shaft 5-2 with flange is connected to connecting plate 5-3 of pressure head mechanism. The lower pressure head 5-4 is connected to flange. The pressure head has countersunk holes and is connected to clamping block 5-5 by two pins and four nails. Guide block slides longitudinally in the groove of clamping block. The guide block has a longitudinal groove to allow the flat key to slide. Spring plunger 5-7 is used to retain the flat key in the groove to prevent it from sliding out. Sensor 5-8 is used to detect the position of flat key.

[0031] Furthermore, a groove is provided in the guide block to accommodate a set of buffer springs 6-1; a pin hole is provided in the middle to allow pins 6-2 to pass through, and the pins slide in the groove of the clamping block, thereby driving the guide block to slide longitudinally.

[0032] A method for press-fitting a flat key onto a stator in an electric drive system, characterized in that:

[0033] The flat key is placed in the vibratory feeder mechanism 1-2. The flat key passes through the guide groove to the key inlet 3-2 of the flat key guide mechanism 2-1. The detection sensor 3-13 detects the flat key in place, and the transverse cylinder 3-9 in the flat key guide mechanism extends.

[0034] Push the slide plate A3-6 laterally, causing the third guide block to move laterally into position. After the proximity switch 3-10 detects that it is in position, the second guide groove 3-7 in the third guide block and the first guide groove 3-4 in the second guide block maintain the same perpendicularity. The flat key falls into the guide groove in the third guide block. The detection sensor loses the signal, the slide mechanism is in the initial position without extension, the lateral cylinder in the flat key guide mechanism returns to the initial position, and the proximity switch detects that it is in position. The flat key slides down from the guide groove in the third guide block, passes through the key outlet 3-12, and enters the flat key retention port 4-13 of the top key mechanism 2-5.

[0035] After the detection sensor at the key mechanism's retention port receives the signal that the flat key is in place, the first transverse cylinder 4-4 extends, causing the floating joint block 4-7 to move laterally, which in turn causes the slide plate B4-3 to move laterally. The second transverse cylinder 4-5 extends, causing the connecting block 4-8 ​​and the key mechanism 2-5 to move laterally into place. After the magnetic switch detects the position signal, the longitudinal cylinder 4-10 of the key mechanism extends, causing the ejector pin 4-11 to extend and push the flat key into the groove of the guide block 5-6 in the pressure head mechanism. The longitudinal cylinder of the key mechanism drives the ejector pin to retract, and the flat key falls to the spring plunger 5-7 and then remains in the groove.

[0036] After the sensor 5-8 on the guide block in the pressing head mechanism detects the signal that the flat key is in place, it controls the press to move downward to press the flat key. When the guide block contacts the plane of the stator key, the buffer spring 6-1 in the guide block is compressed by force, and the pin 6-2 in the guide block slides longitudinally in the groove of the pressing block in the pressing head mechanism, which drives the guide block to slide upward. The flat key slides in the opposite direction in the groove and is pressed into the stator keyway by the contact surface of the pressing head 5-4.

[0037] Furthermore, the flat key 6-3 slides within the guide block and is held in place by the spring plunger in its natural state. During press-fitting, it is pushed into the stator keyway by the surface of the press head. The sensor 5-8 on the side of the guide block detects whether the flat key has slid out of the press-fitting process to prevent the flat key from being lost or accidentally pressed.

[0038] Compared with the prior art, the beneficial effects of the present invention are:

[0039] This invention employs a key-feeding mechanism composed of multiple sets of cylinders. A vibratory feeder delivers the flat key to the key-feeding inlet of the mechanism. The cylinders then drive a guide block, guiding the key into the pressing head for pressing. This allows for key feeding over longer distances while maintaining displacement accuracy, and also enables the identification of whether the key is properly positioned, increasing the success rate of pressing. The pressing head uses a flexible pressing mechanism, with two sets of springs cushioning the contact surface during pressing, thus solving the problem of damage or scratching the stator core during flat key pressing. Attached Figure Description

[0040] The invention will now be further described with reference to the accompanying drawings:

[0041] Figure 1 This is a simplified structural diagram of the stator press-fit key device for the electric drive system of the present invention;

[0042] In the diagram: 1-1. Frame, 1-2. Vibratory feeder mechanism, 1-3. Key feeding mechanism, 1-4. Press head mechanism;

[0043] Figure 2 Here is a simplified structural diagram of the key feeding mechanism;

[0044] In the diagram: 2-1. Flat key guide mechanism, 2-2. Connecting plate, 2-3. Welding frame, 2-4. Slide mechanism, 2-5. Top key mechanism, 2-6. Top key mechanism connecting plate;

[0045] Figure 3 Here is a simplified structural diagram of the flat key guide mechanism;

[0046] In the diagram: 3-1. First guide block, 3-2. Key inlet, 3-3. Second guide block, 3-4. First guide groove, 3-5. Third guide block, 3-6. Slide A, 3-7. Second guide groove, 3-8. Guide rail, 3-9. Lateral cylinder, 3-10. Proximity switch, 3-11. Stop, 3-12. Key outlet, 3-13. Detection sensor;

[0047] Figure 4 Simplified structural diagrams of the slide mechanism and the key mechanism;

[0048] In the diagram: 4-1. First transverse guide rail, 4-2. Second transverse guide rail, 4-3. Slide plate B, 4-4. First transverse cylinder, 4-5. Second transverse cylinder, 4-6. Connecting plate for the first transverse cylinder, 4-7. Floating joint block, 4-8. Connecting block, 4-9. Connecting plate for the key mechanism, 4-10. Longitudinal cylinder, 4-11. Ejector pin, 4-12. Fixing block, 4-13. Flat key retention port;

[0049] Figure 5 Here is a simplified structural diagram of the pressure head mechanism;

[0050] In the diagram: 5-1. Adjusting block, 5-2. Connecting shaft with flange, 5-3. Connecting plate of pressure head mechanism, 5-4. Pressure head, 5-5. Pressing block, 5-6. Guide block, 5-7. Spring plunger, 5-8. Sensor;

[0051] Figure 6 A simplified structural diagram of the guide block's related mechanisms;

[0052] In the diagram: 6-1. Buffer spring, 6-2. Pin, 6-3. Flat key;

[0053] Figure 7 This is a schematic diagram of the stator press-fit flat key device structure of the electric drive system described in this invention. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of the embodiments of this invention will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this invention. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this invention, and should not be construed as limiting the invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention. The embodiments of this invention will be described in detail below with reference to the accompanying drawings.

[0055] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0056] The present invention will now be described in detail with reference to the accompanying drawings:

[0057] The technical solution of the present invention is implemented as follows: the invention consists of multiple mechanisms such as a frame, a vibratory feeder mechanism, a key feeding mechanism, and a pressure head mechanism.

[0058] The flat key is manually placed into the vibratory feeder mechanism 1-2. The flat key passes through the guide groove to the key inlet 3-2 of the flat key guide mechanism 2-1. The detection sensor 3-13 detects the flat key's placement. The transverse cylinder 3-9 in the flat key guide mechanism extends, pushing the slide plate A3-6 laterally, causing the third guide block connected to it to also move laterally into place. After the proximity switch 3-10 detects the placement, the second guide groove 3-7 in the third guide block is now perpendicular to the first guide groove 3-4 in the second guide block. Due to gravity, the flat key naturally falls into the guide groove in the third guide block. At this time, the detection sensor loses its signal. The slide mechanism is in its initial position before extension. The transverse cylinder in the flat key guide mechanism begins to return to its initial position. The proximity switch detects the placement. Due to gravity, the flat key naturally slides down from the guide groove in the third guide block, passes through the key outlet 3-12, and enters the flat key retention port 4-13 of the top key mechanism 2-5.

[0059] After the sensor at the key mechanism's retention port receives the signal that the flat key is in place, the first transverse cylinder 4-4 extends, causing the floating connector block 4-7 to move laterally, which in turn causes the slide plate B4-3 to move laterally. After the movement is in place, the second transverse cylinder 4-5 extends, causing the connecting block 4-8 ​​and the key mechanism 2-5 to move laterally into place. After the magnetic switch detects the position signal, the longitudinal cylinder 4-10 of the key mechanism extends, causing its ejector pin 4-11 to extend and push the flat key into the groove of the guide block 5-6 in the pressure head mechanism. Then, the longitudinal cylinder of the key mechanism drives the ejector pin to retract, and the flat key falls to the spring plunger 5-7 due to gravity and is then left in the groove.

[0060] After sensor 5-8 on the guide block in the pressing head mechanism detects the signal that the flat key is in place, it controls the press to move downwards to press the flat key. First, the guide block contacts the plane of the stator key. As pressing continues, the buffer spring 6-1 in the guide block contracts under force, and the pin 6-2 in the guide block slides longitudinally in the groove of the pressing block in the pressing head mechanism, causing the guide block to slide upwards. Meanwhile, the flat key slides in the opposite direction in the groove. Finally, the flat key is pressed into the stator keyway by the contact surface of the pressing head 5-4.

[0061] This invention relates to a device and method for pressing flat keys into stators of electric drive systems. It is used for the transfer and pressing of flat keys in the stator housing process of new energy vehicle electric drive systems. The device includes a flat key transfer mechanism for loading the flat key before stator pressing, which transfers the flat key to the pressing mechanism via a cylinder extension and positioning. The pressing mechanism applies downward pressure through a servo press, driving the pressing head downward to press the flat key into the stator keyway, thus achieving guiding and positioning before pressing in the stator housing process of new energy electric drive systems. This invention not only avoids manual loading, which has low automation and affects cycle time, but also addresses the low efficiency and high defect rate of traditional pressing methods, leading to high production costs. This invention significantly improves production cycle time, reduces manual pressing error rate, and thus lowers production costs. It features high positioning accuracy, stability, reliability, and faster production cycle time. The purpose of this invention is to provide a device and method for pressing flat keys into stators of electric drive systems.

[0062] like Figure 1 , Figure 7 As shown, 1-2 is the vibratory feeder mechanism, which feeds the flat key through the vibratory feeder. The flat key falls into the key inlet of the key feeding mechanism 1-3 through the guide groove. There is an adjustment structure at the connection between the welding frame and the machine frame, which can adjust the position of the key feeding mechanism. The flat key is finally fed into the pressure head mechanism 1-4 by the top key structure of the key feeding mechanism. The pressure head has a key storage groove and a spring plunger to ensure that the flat key will not fall off naturally. Then it is pressed into the stator keyway.

[0063] like Figure 2The diagram shows the key delivery mechanism. The connecting plate 2-2 of the flat key guide mechanism 2-1 has an elongated hole and is screwed to the welding frame 2-3. The transverse sliding table mechanism 2-4 is also screwed to the welding machine and integrated with the frame. The key-lifting mechanism 2-5's key-lifting mechanism connecting plate 2-6 is connected to the slider of the sliding table mechanism, and is driven by two sets of transverse cylinders to reciprocate laterally. Lateral movement is achieved through two sets of cylinder guide rails, which provide high precision, meeting the requirement of high positioning accuracy when transporting flat keys over long distances.

[0064] like Figure 3 The diagram shows the key guide mechanism. The first guide block 3-1 has a countersunk hole and is threaded to the welding frame. The vibratory feeder slide delivers the key to the key inlet 3-2 of the first guide block. The second guide block 3-3 has a first guide groove 3-4 that is threaded through and connected to the welding frame. The first guide block 3-1 and the second guide block 3-3 both have countersunk holes and are threaded to the welding frame. The third guide block 3-5 has a countersunk hole on one side that connects to the slide plate A3-6, and a second guide groove 3-7 on the other side. Slide plate A is connected to the slider of guide rail 3-8. The side of slide plate A has fine threads that connect to the floating joint of the transverse cylinder 3-9. Two proximity switches 3-10 detect whether the screws on slide plate A are in position; this distance is exactly the distance between the two guide grooves. Finally, the key falls into the key outlet 3-12 of the stop block 3-11. Through-beam sensors 3-13 are installed on both sides of the second guide block to detect whether the key has fallen into position. The key guide mechanism can track the position of the key that may get stuck in various stages of transportation under special conditions, eliminating the possibility of lost or mis-pressed key. By using multiple sets of cylinders and guide rails, the key can be transported over a long distance while meeting the accuracy requirements.

[0065] like Figure 4 The slide mechanism and the key mechanism are shown. The transverse slide mechanism consists of a first transverse guide rail 4-1, a second transverse guide rail 4-2, a slide plate B 4-3, a first transverse cylinder 4-4, and a second transverse cylinder 4-5. The first transverse cylinder connecting plate 4-6 has a countersunk hole and is screwed to the welding frame. The cylinder extension joint is connected to the slide plate B through a floating joint block 4-7, driving the slide plate B to move laterally. The second transverse cylinder is screwed to the slide plate B through a countersunk hole in the connecting block 4-8. The extension cylinder joint is connected to the key mechanism. The key mechanism connecting plate 4-9 has a countersunk hole and is connected to the guide rail slider, thereby realizing the transverse movement of the key mechanism. The longitudinal cylinder 4-10 of the key mechanism is connected to the ejector pin 4-11. The extension and retraction of the cylinder drives the ejector pin to move vertically up and down, pushing the flat key from the flat key retention port 4-13 of the fixed block 4-12 into the key storage groove in the pressure head.

[0066] The first transverse cylinder drives the slide plate B to move laterally, and the second transverse cylinder extends its cylinder connector to connect with the key mechanism, thereby realizing the transverse movement of the key mechanism. The extension and retraction of the longitudinal cylinder of the key mechanism drives the ejector pin to move vertically up and down, pushing the flat key into the key storage groove in the pressure head.

[0067] like Figure 5 The diagram shows the pressure head mechanism. Adjusting block 5-1, adjusted by a pull-tighten screw, serves to adjust the position of the pressure head axis, ensuring accuracy during the key press-fitting process. Connecting shaft 5-2 with a flange connects to connecting plate 5-3. The lower pressure head 5-4 connects to the flange. The pressure head has a countersunk hole and is connected to clamping block 5-5 using two pins and four screws. Guide block 5-6 slides longitudinally within the groove of clamping block. The guide block's longitudinal groove allows the key to slide, and spring plunger 5-7 retains the key within the groove to prevent it from sliding out due to gravity. Sensor 5-8 detects the key's position.

[0068] like Figure 6 The diagram shows the structure of the guide block. A groove is made inside the guide block to accommodate a set of buffer springs 6-1, which can reduce the pressure and scratches on the stator key surface during press fitting.

[0069] A central hole is punched to allow pin 6-2 to pass through. The pin slides within the groove of the clamping block, thereby causing the guide block to slide longitudinally.

[0070] The flat key 6-3 slides within the guide block and is held in place by the spring plunger in its natural state. During pressing, it is pushed into the stator keyway by the surface of the press head. This ensures the accuracy of the key pressing position, and the sensor 5-8 on the side of the guide block can also detect whether the flat key has slid out of the pressing position, further preventing the possibility of the flat key being lost or accidentally pressed.

[0071] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications, equivalent substitutions, and improvements made by those skilled in the art within the scope of the technology disclosed in the present invention, and within the spirit and principles of the present invention, should be included within the scope of protection of the present invention. Furthermore, all content not described in detail in this specification is prior art known to those skilled in the art.

Claims

1. A stator press-fit key device for an electric drive system, comprising a frame (1-1), characterized in that: It also includes a vibratory feeder mechanism (1-2), a key feeding mechanism (1-3), and a pressure head mechanism (1-4). The key feeding mechanism (1-3) includes a flat key guiding mechanism (2-1), a slide mechanism (2-4), a top key mechanism (2-5), and a welding frame; the welding frame is connected to the machine frame; The vibratory feeder mechanism (1-2) feeds the flat key. The flat key is fed into the pressure head mechanism (1-4) through the key inlet (3-2) of the flat key guide mechanism (2-1), and then through the slide mechanism (2-4) and the top key mechanism (2-5). The flat key is pressed into the stator keyway. The groove in the vibratory feeder mechanism (1-2) and the first guide block (3-1) in the flat key guide mechanism (2-1) are in contact and sliding fit; The base plate in the flat key guide mechanism (2-1) is connected to the L plate in the slide mechanism (2-4); The guide rail slider in the slide mechanism (2-4) is connected to the connecting plate of the top key mechanism in the top key mechanism (2-5); The ejector pin in the ejector key mechanism (2-5) contacts the guide block in the pressure head mechanism (1-4). The ejector pin pushes the flat key into the guide block, and the spring plunger inside the guide block retains the flat key. The flat key guiding mechanism also includes a second guide block (3-3), a first guide groove (3-4), a third guide block (3-5), a slide plate A (3-6), a second guide groove (3-7), a guide rail (3-8), a transverse cylinder (3-9), a proximity switch (3-10), a stop block (3-11), a key outlet (3-12), and a detection through-beam sensor; The first guide block (3-1) has a countersunk hole and is threaded to the welding frame. The vibratory feeder slide will send the flat key to the key inlet (3-2) of the first guide block. The second guide block (3-3) has a first guide groove (3-4) that is threaded to the welding frame. The third guide block (3-5) has a countersunk hole on one side and is connected to the slide plate A (3-6). The other side has a second guide groove (3-7) that is threaded through. The slide plate A is connected to the slider of the guide rail (3-8). The side of the slide plate A is connected to the floating joint of the transverse cylinder (3-9). The two proximity switches (3-10) will detect whether the screws on the slide plate A are in place. The distance between the two proximity switches (3-10) is exactly the distance between the relative sliding of the two guide grooves. Finally, the flat key falls into the key outlet (3-12) of the stop block (3-11). The detection sensors (3-13) are respectively installed on both sides of the second guide block to detect whether the flat key is in place.

2. The stator press-fit flat key device for an electric drive system according to claim 1, characterized in that: The slide mechanism also includes a first transverse guide rail (4-1), a second transverse guide rail (4-2), a slide plate B (4-3), a first transverse cylinder (4-4), a second transverse cylinder (4-5), a first transverse cylinder connecting plate (4-6), a floating joint block (4-7), and a connecting block (4-8). The first transverse cylinder connecting plate (4-6) has a countersunk hole and is screwed to the welding frame. The extended joint of the first transverse cylinder (4-4) is connected to the slide plate B (4-3) through the floating joint block (4-7), which drives the slide plate B (4-3) to move laterally. The second transverse cylinder (4-5) is screwed to the slide plate B (4-3) as a whole. The extended cylinder joint of the second transverse cylinder (4-5) is connected to the top key mechanism.

3. The stator press-fit flat key device for an electric drive system according to claim 2, characterized in that: The top key mechanism also includes a longitudinal cylinder (4-10), a fixing block (4-12), and a flat key retention port (4-13). The first transverse cylinder connecting plate (4-6) has a countersunk hole and is connected to the guide rail slider to realize the transverse movement of the key mechanism. The longitudinal cylinder (4-10) of the key mechanism is connected to the ejector pin. The extension and retraction of the longitudinal cylinder drives the ejector pin to move vertically up and down, pushing the flat key from the flat key retention port (4-13) of the fixed block (4-12) into the key storage groove in the pressure head.

4. The stator press-fit key device for an electric drive system according to claim 3, characterized in that: The pressure head mechanism also includes an adjusting block (5-1), a connecting shaft with a flange (5-2), a connecting plate (5-3) for the pressure head mechanism, a pressure head (5-4), a clamping block (5-5), and a sensor (5-8); The adjusting block (5-1) is adjusted by pulling and tightening screws to adjust the position of the pressure head axis. The connecting shaft (5-2) with flange is connected to the connecting plate (5-3) of the pressure head mechanism. The lower pressure head (5-4) is connected to the flange. The pressure head is countersunk and connected to the clamping block (5-5) with two pins and four nails. The guide block slides longitudinally in the groove of the clamping block. The guide block has a longitudinal groove to make the flat key slide. The spring plunger (5-7) is used to retain the flat key in the groove to prevent it from sliding out. The sensor (5-8) is used to detect the position of the flat key.

5. The stator press-fit key device for an electric drive system according to claim 4, characterized in that: The guide block has a groove for inserting a set of buffer springs (6-1); a pin hole is provided in the middle for a pin (6-2) to pass through. The pin slides in the groove of the clamping block, thereby driving the guide block to slide longitudinally.

6. The pressing method for a stator press-fitting flat key device of an electric drive system according to claim 5, characterized in that: The flat key is placed into the vibratory feeder mechanism (1-2). The flat key passes through the guide groove to the key inlet (3-2) of the flat key guide mechanism (2-1). The detection sensor (3-13) detects the flat key in place, and the transverse cylinder (3-9) in the flat key guide mechanism extends. Push the slide plate A (3-6) laterally, causing the third guide block to move laterally into position. After the proximity switch (3-10) detects that it is in position, the second guide groove (3-7) in the third guide block and the first guide groove (3-4) in the second guide block maintain the same verticality. The flat key falls into the second guide groove in the third guide block. The detection sensor loses the signal, the slide mechanism is in the initial position without extension, the lateral cylinder in the flat key guide mechanism returns to the initial position, and the proximity switch detects that it is in position. The flat key slides down from the guide groove in the third guide block, passes through the key outlet (3-12), and enters the flat key retention port (4-13) of the top key mechanism (2-5). After the detection sensor at the key mechanism's retention port receives the signal that the flat key is in place, the first transverse cylinder (4-4) extends, causing the floating joint block (4-7) to move laterally, which in turn causes the slide plate B (4-3) to move laterally. The second transverse cylinder (4-5) extends, causing the connecting block (4-8) and the key mechanism (2-5) to move laterally into place. After the magnetic switch detects the position signal, the longitudinal cylinder (4-10) of the key mechanism extends, causing the ejector pin (4-11) to extend and push the flat key into the groove of the guide block (5-6) in the pressure head mechanism. The longitudinal cylinder of the key mechanism drives the ejector pin to retract, and the flat key falls to the spring plunger (5-7) and then remains in the groove. After the sensor (5-8) on the guide block in the pressing head mechanism detects the signal that the flat key is in place, it controls the press to move downward to press the flat key. The guide block contacts the plane of the stator key, the buffer spring (6-1) in the guide block is compressed by force, and the pin (6-2) in the guide block slides longitudinally in the groove of the pressing block in the pressing head mechanism, which drives the guide block to slide upward. The flat key slides in the groove in the opposite direction. The flat key is restricted by the contact surface of the pressing head (5-4) and pressed into the stator keyway.

7. The pressing method according to claim 6, characterized in that: The flat key (6-3) slides inside the guide block and is held in place by the spring plunger in its natural state. During press-fitting, it is pushed into the stator keyway by the surface of the press head. The sensor (5-8) on the side of the guide block detects whether the flat key has slid out of the press-fitting process to prevent the flat key from being lost or accidentally pressed.

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