A drive motor carbon brush grounding system

Abstract

The present application discloses a carbon brush grounding system for a drive motor, which is mainly arranged inside the motor shaft for conductive grounding. It includes a wear part elastically abutted against the motor shaft and an elastic component for elastically mounting the wear part. A working groove is arranged in the middle part of the wear part, and a safety component is arranged at a position corresponding to the working groove on the outer side of the motor shaft. Through the arrangement of the safety component, when the wear part wears to a certain extent, the rotation of the motor shaft will cause the elastic acting part to perform intermittent actions, so that the safety part slowly descends and finally triggers a protection switch, thereby cutting off the power supply of the motor. Obviously, from the recognition of the wear of the wear part to the triggering of the protection switch is a continuous process. During this period, a warning light or other warning signals can be set to remind to replace the wear part as soon as possible, thus ensuring safety.

Description

Technical Field

[0001] This application relates to the technical field of motor accessories, and in particular to a carbon brush grounding system for a drive motor. Background Art

[0002] New energy vehicles regard the three-electric system, namely the battery, the motor, and the electronic control, as the most core technologies. The performance of the three-electric system can directly affect the final performance of the product and is also a key factor considered by users when consuming. Among them, as the driving source, the life and stability of the motor are directly related to the durability and safety of vehicle driving.

[0003] Existing motors have the following defects: Affected by the frequency conversion controller, potential differences, i.e., shaft voltages, will be generated at both ends of the motor shaft or at local parts of the motor shaft during the operation of the motor. When the shaft voltage accumulates to the point where it can break down the oil film of the motor bearing, conduction will occur between the motor shaft and the motor bearing to form a shaft current, causing electro-corrosion of the motor bearing and resulting in unstable operation of the motor bearing. On the other hand, when the motor is running, charges are likely to accumulate on its metal shell. On the one hand, this will affect the normal operation of the motor, and on the other hand, there are also potential safety hazards. For the existing motor grounding structure, due to the rotation of the motor shaft, the grounding system is usually prone to wear. When the wear is complete and the grounding function is lost, potential safety hazards are likely to occur. Summary of the Invention

[0004] The purpose of this application is to provide a carbon brush grounding system for a drive motor.

[0005] To achieve the above purpose, the technical solution adopted in this application is: A carbon brush grounding system for a drive motor is mainly arranged inside the motor shaft for conductive grounding, including a wearing part elastically abutted against the motor shaft and an elastic component for elastically mounting the wearing part. A working groove is provided in the middle part of the wearing part, and a safety component is arranged at a position corresponding to the working groove on the outer side of the motor shaft. The safety component includes an elastic acting part, a transmission structure, and a safety part. In the initial state, the elastic acting part extends into the motor shaft. The elastic acting part is adapted to contract when the wearing part is installed in place. During the installation process, the wearing part elastically deforms the elastic acting part to make way. A protection switch is arranged below the safety part. The outer wall of the wearing part is in contact with the inner cavity of the motor shaft. The wearing part is grounded. The wearing part is elastically installed on the side facing the inside of the inner cavity of the motor shaft. The working groove has different depths, and the depth change is smoothly processed. The working grooves with different depths act on the safety component in sequence when the motor shaft rotates, so that the elastic acting part intermittently expands and contracts. The intermittently expanding and contracting elastic acting part makes the safety part continuously descend until the safety part descends to trigger the protection switch to cut off the power supply, so that the motor stops running.

[0006] As a preference, the transmission structure is arranged between the outside of the elastic acting part and the insurance part. The wearing part includes a wearing main body at the head and a fixing main body at the tail. When the elastic acting part moves outward, the insurance part moves downward through the transmission structure. The wearing main body abuts against the inside of the elastic acting part in the initial installation state. When the wearing part is worn to a certain extent, due to the reduction of the wall thickness of the wearing part, it can no longer tightly abut against the inner cavity of the corresponding motor shaft. The elastic component makes the wearing part move forward so that the fixing main body abuts against the elastic acting part. The acting groove is formed at the fixing main body. The acting groove includes at least two depths. The elastic acting part extends into the inner side direction of the motor shaft and acts on different depths of the acting groove in sequence. The transmission structure and the insurance part cooperate in the shallow part of the acting groove to make the insurance part descend and release the cooperation in the deep part of the acting groove, so that the transmission structure drives the insurance part to move intermittently.

[0007] As a preference, the joints between the wearing main body and the inner cavity of the motor shaft are all conical. The two conical parts cooperate with each other. When the conical part of the wearing main body is worn, the fixing main body begins to be acted on by the elastic component. At this time, the elastic acting part corresponds to the acting groove, so that the elastic acting part extends into the acting groove. When the motor shaft rotates at this time, the corresponding elastic acting part begins to act on different depths of the acting groove in sequence, thus showing a stretching and contracting action. Through the stroke transmission of the transmission structure, such an action is converted into an action of continuously making the insurance part descend until the insurance part acts on the protection switch.

[0008] As a preference, a support assembly is provided at the bottom of the insurance part. The support assembly includes a support platform hingedly arranged. A spring is arranged on the side of the support platform facing the insurance part. An acting bump is arranged inside the insurance part. The acting bump has a guiding surface. The transmission structure conducts a guiding effect through the guiding surface to cause the insurance part to descend. When the acting bump on the insurance part is acted on and descends, the acting bump located below and the support platform act on each other and cause the support platform to rotate, so that the corresponding acting bump passes through. After the acting bump passes through, the support platform immediately resumes its original state under the reset action of the spring. At this time, the insurance part is not acted on by the elastic acting part and the support platform until the next acting bump abuts against the support platform. When multiple acting bumps act on the elastic acting part in sequence, the insurance part descends by the distance between adjacent two acting bumps in sequence. When the guiding surface of the acting bump exists and the motor shaft rotates, the elastic acting part continuously acts at different depths in the acting groove, and the outside thereof is correspondingly transmitted to the position of the acting bump through the transmission structure. When acting towards the acting bump, the acting bump descends under the action of the transmission structure. At this time, the acting bump at the bottommost passes through the support platform and reaches below the support platform. After the support platform rotates and gives way and then resets, the second acting bump from the bottom and the reset support platform abut against each other. Subsequently, when the motor shaft continues to rotate, the acting bump continuously descends until the bottom of the insurance part triggers the protection switch and the motor stops rotating.

[0009] As a preference, acting components are arranged at equal intervals inside the acting groove. The thickness of the acting components gradually increases along the direction of the same rotation as the motor shaft of the acting groove. Multiple acting components are arranged at equal intervals. The action between the elastic acting part and the acting groove is divided into two stages. The first stage is the position of the elastic acting part at the deep part of the acting groove. At this time, the elastic acting part is in an extended state. The second stage is that the motor shaft rotates to cause the elastic acting part to gradually move from the lower part to the upper part of the acting component. At this time, the corresponding elastic acting part contracts. When the elastic acting part and the acting groove act, when the motor shaft rotates, the acting component and the elastic acting part start to contact and continuously push the elastic acting part towards the outside until the acting component passes through. The elastic acting part resets and acts on the deepest part of the acting groove. Multiple spaced acting components act on the elastic acting part in the same way in sequence.

[0010] As a preference, in the natural state, the insurance part has a tendency to move towards the protection switch. Acting bumps are arranged at intervals on the side of the top of the insurance part facing the elastic acting part. The top of the acting bump is a guiding surface, and the distance between adjacent two acting bumps is greater than or equal to 1.5 times the height of the acting bump.

[0011] As a preference, the transmission structure includes a lifting part and a transverse moving part. The lifting part is arranged on the transverse moving part. The outer end of the lifting part is connected to the elastic acting part. The lifting part has a chute in the lifting direction on the transverse moving part. The transverse moving part is installed with a limit, and it makes a limit movement in the horizontal direction of the lateral movement towards the elastic acting part. When the elastic acting part moves outward from the motor shaft, the transverse moving part moves outward and at the same time the lifting part rises. When the elastic acting part moves inward from the motor shaft, the transverse moving part moves inward and the lifting part descends. When the transverse moving part moves towards the outside of the motor shaft, the transverse moving part acts on the acting convex block on the insurance part, causing the acting convex block to move downward. The insurance part and the corresponding acting convex block are arranged in a ring shape.

[0012] As a preference, there are 4 insurance parts arranged in a ring shape in total, and the corresponding acting convex blocks are also arranged in a ring shape. All 4 insurance parts are provided with limit rods. The distance between adjacent two insurance parts is less than the length of the transverse moving part. In the initial state, the acting convex block at the bottommost part abuts against the support platform.

[0013] As a preference, a compression spring is arranged at the top of the insurance part. The elasticity of the compression spring is less than that of the spring at the support platform. In the initial state, the compression spring abuts against the insurance part so that the corresponding acting convex block on the insurance part abuts against the support platform.

[0014] As a preference, this driving motor carbon brush grounding system further includes a conductive part. The conductive part has an elastic stroke. In the initial state, the wearing part is fixed at the end of the conductive part. The conductive part makes the wearing part elastically abut against the motor shaft through the elastic stroke. There is an end cover arranged on one side of the motor shaft. There is also an installation plate arranged between the end cover and the motor shaft. The lower part of the insurance part corresponds to the installation plate. The protection switch is set as a travel switch with a power cut-off function installed on the installation plate. The travel switch is arranged perpendicular to the installation plate and is provided with an elastic part so that the travel switch is located at a fixed position protruding from the installation plate in the initial state.

[0015] As a preference, a step is formed at the bottom of the side surface of the wearing part, and an acting groove is formed at the step. The acting part is arranged at the step. When the head of the wearing part starts to wear, the elastic stroke of the conductive part makes it move in the wearing direction until the step corresponds to the elastic acting part, and the elastic acting part moves and abuts towards the direction of the step.

[0016] As an optimization, the travel switch is connected to the leakage protection switch of the motor, and a sensor is provided at the support platform to identify its movement. The sensor is connected to the electronic control system. When the wear part wears out, the insurance part is continuously driven to move towards the support platform side. The sensor receives the identification signal at intervals, and the electronic control system provides real-time feedback. When the insurance part triggers the travel switch, the leakage protection switch cuts off the power supply of the motor.

[0017] Compared with the prior art, the beneficial effects of this application are as follows:

[0018] Through the setting of the insurance component, when the wear part wears to a certain extent, the rotation of the motor shaft will cause the elastic acting part to act intermittently, so that the insurance part slowly descends and finally triggers the protection switch, thereby cutting off the power supply of the motor. Obviously, from the recognition of the wear of the wear part to the triggering of the protection switch is a continuous process. During this period, a warning light or other warning signals can be set to remind to replace the wear part as soon as possible, thus ensuring safety. Description of the Drawings

[0019] Figure 1 is the overall structural schematic diagram of an embodiment of this application.

[0020] Figure 2 is Figure 1 the schematic diagram of the internal structure in

[0021] Figure 3 is Figure 2 the schematic diagram of a partial structure in

[0022] Figure 4 is Figure 3 the schematic diagram when some parts are hidden in

[0023] Figure 5 is the schematic diagram of the cooperation between the motor shaft and the wear part.

[0024] Figure 6 is at Figure 5 the schematic diagram of the elastic acting part at position A in

[0025] Figure 7 is the schematic diagram when the elastic acting part is stretched.

[0026] Figure 8 is the schematic diagram with the insurance component arranged at the motor shaft and the wear part.

[0027] Figure 9 is Figure 8 the schematic diagram from another perspective.

[0028] Figure 10 is the schematic diagram of the support platform and the acting convex block in contact.

[0029] Figure 11 It is a partial structural schematic diagram of the insurance department.

[0030] In the figure: 1. End cover; 2. Motor shaft; 3. Insurance component; 4. Insurance department; 5. Limit rod; 6. Acting convex block; 7. Annular acting part; 8. Protection switch; 9. Elastic rod; 10. Wear part; 11. Conductive part; 12. Limiting part; 13. Elastic component; 14. Acting groove; 15. Transmission structure; 151. Transverse movement part; 152. Lifting part; 16. Acting component. Specific embodiments

[0031] Next, in combination with the specific embodiments, the present application will be further described. It should be noted that, on the premise of no conflict, the following-described embodiments or technical features can be arbitrarily combined to form new embodiments.

[0032] In the description of the present application, it should be noted that for orientation terms, such as the terms "center", "transverse", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the orientation and position relationships indicated are based on the orientation or position relationships shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as limiting the specific protection scope of the present application.

[0033] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence.

[0034] The terms "comprising" and "having" in the description and claims of the present application, and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0035] Embodiment:

[0036] Refer to Figures 1 to 11, this embodiment proposes a driving motor carbon brush grounding system, which includes a wearing part 10 elastically abutted against the motor shaft 2 and an elastic component 13 for elastically mounting the wearing part 10. An acting groove 14 is provided in the middle part of the wearing part 10, and a safety component 3 is provided at a position corresponding to the acting groove 14 outside the motor shaft 2. The safety component 3 includes an elastic acting part, a transmission structure 15 and a safety part 4. The elastic acting part extends into the motor shaft 2 in the initial state and is adapted to contract when the wearing part 10 is installed in place. During the installation process, the wearing part 10 elastically deforms the elastic acting part for avoidance; a protection switch 8 is provided below the safety part 4. The outer wall of the wearing part 10 is connected to the inner cavity of the motor shaft 2, and the wearing part 10 is grounded. The wearing part 10 is elastically mounted on the inner side facing the inner cavity of the motor shaft 2. The acting groove 14 has different depths, and the depth change is smoothly processed. The acting grooves 14 with different depths act on the safety component 3 in turn when the motor shaft 2 rotates, so that the elastic acting part intermittently expands and contracts. The intermittently expanding and contracting elastic acting part makes the safety part 4 continuously descend until the safety part 4 descends to trigger the protection switch 8 to cut off the power supply, so that the motor stops running.

[0037] As Figure 5 shown, the wearing part 10 is actually a component that is connected to the motor shaft 2 for conducting electricity. It can be a whole or composed of a conductive part 11 plus a replaceable wearing head. Since friction will occur between the connection between the end of the wearing part 10 and the clamping groove and the rotating motor shaft 2, its head will actually gradually become smaller. At this time, the elastic component 13 below the wearing part 10 will make the un-worn lower part abut against it to ensure contact. In order to reduce the wear of the motor shaft 2, the wearing part 10 can be made of a material that is more easily worn than the motor shaft 2. When the wearing part 10 is worn to a certain extent or completely worn out, the grounding system fails, and at this time, if the motor continues to run, there may be an electric shock risk.

[0038] However, wear is difficult to avoid. Therefore, in order to ensure that the motor can stop running in time after the grounding system wears out, through the setting of the safety component 3 in this application, when the wearing part 10 is worn to a certain extent, the rotation of the motor shaft 2 will cause the elastic acting part to act intermittently, so that the safety part 4 slowly descends and finally triggers the protection switch 8, so that the motor cuts off the power supply. Obviously, it is a continuous process from identifying the wear of the wearing part 10 to triggering the protection switch 8. During this period, a warning light or other warning signals can be set to remind to replace the wearing part 10 as soon as possible. Of course, in the actual production process, usually this kind of reminder is preferably predicted in advance. To achieve this effect, only a simple fine-tuning is required: set the position of the acting groove 14 on the wearing part 10 slightly in advance, so that when triggered, the wearing part 10 is actually not completely worn.

[0039] As Figure 11As shown, the transmission structure 15 is disposed between the outer side of the elastic acting portion and the safety portion 4. The wear part 10 includes a wear main body at the head and a fixed main body at the tail. When the elastic acting portion moves outward, the safety portion 4 is moved downward through the transmission structure 15. The wear main body abuts against the inner side of the elastic acting portion in the initial installation state. When the wear part 10 is worn to a certain extent, due to the reduction of the wall thickness of the wear part 10, it can no longer abut tightly against the inner cavity of the corresponding motor shaft 2. Therefore, the elastic member 13 makes the wear part 10 move forward so that the fixed main body abuts against the elastic acting portion. The acting groove 14 is formed at the fixed main body. The acting groove 14 includes at least two depths. The elastic acting portion extends into the inner side direction of the motor shaft 2 and acts with different depths of the acting groove 14 in sequence. The transmission structure 15 and the safety portion 4 cooperate in the shallow part of the acting groove 14 to lower the safety portion 4 and release the cooperation in the deep part of the acting groove 14, so that the transmission structure 15 drives the safety portion 4 to move intermittently.

[0040] The joints between the wear main body and the inner cavity of the motor shaft 2 are both conical, and the two conical parts cooperate with each other. When the conical part of the wear main body is worn, the fixed main body begins to be acted on by the elastic member 13. At this time, the elastic acting portion corresponds to the acting groove 14, so the elastic acting portion extends into the acting groove 14. When the motor shaft 2 rotates at this time, the corresponding elastic acting portion begins to act on the acting groove 14 with different depths in sequence, thus showing a telescopic action. At this time, through the stroke transmission of the transmission structure 15, such an action is converted into an action of continuously lowering the safety portion 4 (here, the downward movement actually corresponds to the direction close to the protection switch 8) until the safety portion 4 acts on the protection switch 8.

[0041] As Figure 9As shown, preferably, the acting components 16 are arranged at equal intervals inside the acting groove 14. The thickness of the acting components 16 gradually increases along the direction of the same rotation as the motor shaft 2 in the acting groove 14. A plurality of acting components 16 are arranged at equal intervals. Thus, the action between the elastic acting part and the acting groove 14 can be roughly divided into two stages. The first stage is when the elastic acting part is at a deeper position in the acting groove 14, and at this time, the elastic acting part is in an extended state. The second stage is when the motor shaft 2 rotates, causing the elastic acting part to gradually move from the lower part to the upper part of the acting component 16, and at this time, the corresponding elastic acting part gradually contracts. During the action between the elastic acting part and the acting groove 14, when the motor shaft 2 rotates, the acting component 16 and the elastic acting part start to contact and continuously push the elastic acting part towards the outside until the elastic acting part resets and acts on the deepest part of the acting groove 14 when this acting component 16 passes by. A plurality of spaced acting components 16 act on the elastic acting part in the same way in sequence. Obviously, the increased thickness of the acting component 16 constitutes the shallow part of the acting groove 14 described above, and the position where the acting component 16 is not provided is the deep part of the acting groove 14. Since the thickness of the above-mentioned acting component 16 increases in sequence for the purpose of forming a guiding surface, however, this will cause the depth at the position of the acting component 16 in the acting groove 14 to change gradually. Therefore, the description "the acting groove 14 includes at least two depths" is adopted. In fact, the depth of the acting groove 14 can be regarded as the depth when there is an acting component 16 and the depth when there is no acting component 16.

[0042] A support assembly is provided at the bottom of the insurance part 4. The support assembly includes a support platform arranged in a hinged manner. A spring is provided on the bottom surface of the support platform on the side facing the insurance part 4, as Figure 10As shown, it is a torsion spring. An acting convex block is provided inside the insurance part 4. The acting convex block has a guiding surface. The transmission structure 15 conducts a guiding effect through the guiding surface to cause the insurance part 4 to descend. When the acting convex block on the insurance part 4 is acted on and descends, the acting convex block located below acts on the support platform and causes the support platform to rotate, so that the corresponding acting convex block passes through. After the acting convex block passes through, the support platform is immediately restored under the action of the spring reset. At this time, the insurance part 4 is not affected by the elastic acting part and the support platform until the next acting convex block abuts against the support platform; when multiple acting components 16 act on the elastic acting part in sequence, the insurance part 4 descends by the distance between adjacent two acting convex blocks in sequence. Obviously, when the motor shaft 2 rotates, the guiding surface of the acting convex block causes the elastic acting part to continuously act at different depths in the acting groove 14. The outside thereof is correspondingly transmitted to the acting convex block through the transmission structure 15. When acting towards the acting convex block (corresponding to the elastic acting part being in a contracted state at this time, manifested as the elastic rod 9 moving obliquely upward and outward, and at this time the elastic acting part moves towards the acting convex block), the acting convex block is acted on by the transmission structure 15 and descends. At this time, the lowermost acting convex block passes through the support platform and reaches below the support platform. After the support platform rotates and gives way, it resets. At this time, the second acting convex block from the bottom abuts against the reset support platform. Subsequently, when the motor shaft 2 continues to rotate, the acting convex block will continue to descend until the bottom of the insurance part 4 triggers the protection switch 8 and the motor stops rotating.

[0043] Of course, the distance by which the acting convex block descends under the action of the transmission structure 15 will be affected by the setting of the guiding surface on the acting convex block. Therefore, in actual design, according to requirements, for example, if the distance of each action and descent of the guiding surface is adjusted to be smaller, then the corresponding motor shaft 2 can rotate several more turns before triggering the protection switch 8 and stopping, so as to extend the time for controlling the motor to stop. The significance of such a setting is that in some cases, the motor cannot stop immediately and some necessary preparations need to be made. At this time, the extended time can provide a sufficient idle period. Of course, at this time, a prompt signal needs to be issued when the acting convex block starts to be acted on to prompt the operator to react in time.

[0044] In order to ensure that the insurance part 4 can still be in a suitable acting position when the transmission structure 15 acts again after the insurance part 4 is acted on by the transmission structure 15 each time, the insurance part 4 needs to have a tendency to move towards the protection switch 8 in its natural state. The following simply presents two optional preferred solutions for reference.

[0045] (1) The motor as a whole is installed in a specific direction. At this time, the insurance part 4 remains in a vertical state so that the acting convex block and the insurance column body on it are in a drooping state under the action of gravity in the natural state. After the first acting convex block acts on the transmission structure 15 to make the support platform rotate and avoid, at this time, the first acting convex block passes through the support platform, and the support platform quickly resets (the transmission structure 15 also resets at this time). Since the second acting convex block in the upward direction is still at a certain distance from the support platform, at this time, the insurance part 4 and the acting convex block fall due to gravity until the second acting convex block abuts against the reset support platform. At this time, the transmission structure 15 is also in a reset state, and in the next action, it can drive the second acting convex block to pass through the support platform again, and at the same time, the third acting convex block abuts against the reset support platform. This method does not require additional structures. By the specific installation direction of the motor, the gravity of the insurance part 4 itself can be utilized.

[0046] (2) The motor does not need to be installed in a specific direction. At this time, an elastic member, such as a spring, needs to be added. The general principle is similar to the first type above. This solution does not utilize the gravity of the acting convex block, but an additional spring is set. When the first acting convex block passes through the support platform and the support platform completes a process of rotation and avoidance and reset, the spring makes the second acting convex block automatically move to abut against the reset support platform, and so on, the continuous action of the transmission structure 15 and the acting convex block can be realized; however, in this solution, the elastic force of the spring needs to be limited, that is, the force of the spring that makes the acting convex block abut against the support platform cannot make the support platform rotate. This method adds additional structures, so it is considered to be used when the internal space of the motor is relatively large. For example, a compression spring can be set at the top of the insurance part 4, and the elasticity of the compression spring is less than that of the spring at the support platform; in the initial state, the compression spring abuts against the insurance part 4 to make the corresponding acting convex block on the insurance part 4 abut against the support platform.

[0047] In order to ensure that the transmission structure 15 can be reset normally after each action between the transmission structure 15 and the acting convex block, the distance between two adjacent acting convex blocks needs to be limited. Acting convex blocks are arranged at intervals on the side of the top of the insurance part 4 facing the elastic acting part. The top of the acting convex block is a guiding surface, and the distance between two adjacent acting convex blocks is greater than or equal to 1.5 times the height of the acting convex block. When the distance between two adjacent acting convex blocks is too close, the transmission structure 15 may act on the next acting convex block during the return process after the action, which will hinder the return of the transmission structure 15 to a certain extent.

[0048] The following presents a preferred embodiment of the transmission structure 15.

[0049] As Figure 11As shown, the transmission structure 15 includes a lifting part 152 and a transverse moving part 151. The lifting part 152 is arranged on the transverse moving part 151. The outer end of the lifting part 152 is connected to the elastic acting part. And the lifting part 152 is arranged on the transverse moving part 151 and has a chute in the lifting direction on the transverse moving part 151. The transverse moving part 151 is installed in a limited way and moves in a limited way in the direction of the lateral movement of the elastic acting part. So when the elastic acting part moves outward from the motor shaft 2, it can be understood that this movement is divided into a movement in the height direction and a movement in the horizontal direction. When the elastic acting part moves outward, the transverse moving part 151 moves outward and at the same time the lifting part 152 rises. When the elastic acting part moves inward to the motor shaft 2, the transverse moving part 151 moves inward (towards the side of the motor shaft 2) and the lifting part 152 descends. When the transverse moving part 151 moves outward from the motor shaft 2, the transverse moving part 151 acts on the acting convex block 6 on the safety part 4, causing the acting convex block 6 to move downward. Of course, the motor shaft 2 is in a rotating state. Correspondingly, the transverse moving part 151 and the lifting part 152 also rotate together. The transverse moving part 151 cannot move in the height direction, and the lifting part 152 can only lift and lower in the height direction of the transverse moving part 151 due to the limitation of the transverse moving part 151. Therefore, even when rotating, the transverse moving part 151 and the lifting part 152 can maintain transverse movement and lifting while rotating, so as to act on the acting convex block 6. At this time, the safety part 4 and correspondingly the acting convex block 6 are as Figure 8 shown, arranged in a ring shape. Four safety parts 4 can be arranged in a ring shape. Correspondingly, the acting convex blocks 6 are also arranged in a ring shape (at this time, it is also best to set a ring-shaped acting part 7 on the transverse moving part 151 for coordinated movement). Four limiting rods 5 are arranged on all the four safety parts 4, so that the safety parts 4 can only move up and down. The distance between two adjacent safety parts 4 (corresponding to the acting convex blocks 6) is less than the length of the transverse moving part 151. In this way, even when the transverse moving part 151 rotates between two adjacent acting convex blocks 6, it will not be separated from the acting convex blocks 6. In the initial state, since the acting convex block 6 at the bottommost part abuts against the supporting platform, the safety part 4 is located at a relatively high position in the initial state. Of course, the safety part 4 can also be set as an integral ring shape and limited by the limiting rods 5.

[0050] This driving motor carbon brush grounding system further includes a conductive part 11. The conductive part 11 has an elastic stroke. In the initial state, the wearing part 10 is fixed at the end of the conductive part 11. The conductive part 11 makes the wearing part 10 elastically abut against the motor shaft 2 through the elastic stroke. There is an end cover 1 on one side of the motor shaft 2. There is also a mounting plate between the end cover 1 and the motor shaft 2. The safety part 4 is corresponding to the mounting plate below. The protection switch 8 is set as a travel switch with a power cut-off function installed on the mounting plate. The travel switch is arranged perpendicular to the mounting plate and is provided with an elastic part so that the travel switch is located at a fixed position protruding from the mounting plate in the initial state. The elastic part is not shown in the drawings here.

[0051] The bottom side of the wear part 10 is provided with a step, and an acting groove 14 is formed at the step. The acting component 16 is arranged at the step. When the head of the wear part 10 starts to wear, the elastic stroke of the conductive part 11 causes it to move in the wear direction until the step corresponds to the elastic acting part, and the elastic acting part moves and abuts in the direction of the step.

[0052] It can be understood that during the normal use of the wear part 10, each component of the insurance component 3 does not act, so there is no wear. As a vulnerable part, the wear part 10 at the conductive front end is difficult to detect its wear degree in real time. When the grounding is abnormal and the motor runs without good grounding, there is a risk of electric shock or leakage. The grounding system proposed in this application is provided with a functional part for prompting the abnormality of the wear part 10. The functional part is the insurance component 3. The insurance component 3 is triggered by the transmission structure 15 and is only triggered when the wear part 10 wears to a certain extent. During the daily use of the motor shaft 2, the transmission structure 15 hardly moves.

[0053] The travel switch is connected to the leakage protection switch 8 of the motor, and a sensor is arranged at the support platform to identify its movement. The sensor is connected to the electronic control system. After the wear part 10 wears, the insurance part 4 is continuously driven to move towards the support platform side. The sensor receives the identification signal at intervals, and the electronic control system provides real-time feedback. When the insurance part 4 touches the travel switch, the leakage protection switch 8 cuts off the power supply of the motor.

[0054] In addition, a pressure sensor or other types of sensors can be arranged at the acting convex block 6 to identify and send out a warning signal when the wear part 10 acts on the acting convex block 6 for the first time after wearing to a certain extent.

[0055] The basic principle, main features and advantages of this application have been described above. Those skilled in the art of this industry should understand that this application is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of this application. Without departing from the spirit and scope of this application, this application will have various changes and improvements, and these changes and improvements all fall within the scope of this application claimed. The scope of protection required by this application is defined by the appended claims and their equivalents.

Claims

1. A driving motor carbon brush grounding system, mainly arranged on the inner side of the motor shaft for conductive grounding, characterized in that: The invention comprises a wear part elastically abutting against the motor shaft and an elastic component for elastically installing the wear part, an action groove is provided in the middle part of the wear part, a safety component is provided at a position corresponding to the action groove on the outer side of the motor shaft, the safety component comprises an elastic action part, a transmission structure and a safety component, the elastic action part is extended to the inside of the motor shaft in the initial state, the elastic action part is suitable for contraction when the wear part is installed in place, and the wear part causes the elastic action part to elastically deform and avoid during the installation process; a protection switch is provided below the safety component, the outer wall of the wear part is connected to the inner cavity of the motor shaft, the wear part is grounded, and the wear part is elastically installed toward the inner side of the inner cavity of the motor shaft, the action groove has different depths, and is smoothed at the depth change position, and the action grooves of different depths act on the safety component in sequence when the motor shaft rotates, so that the elastic action part is intermittently extended and retracted, and the intermittently extended elastic action part allows the safety part to continue to drop until the safety part drops to trigger the protection switch and cuts off the power supply, so that the motor stops running; The transmission structure is arranged between the outer side of the elastic action part and the insurance part, and the wearable part includes a wearable main body at the head and a fixed main body at the tail; when the elastic action part moves toward the outside, the insurance part moves downward through the transmission structure; the wearable main body abuts against the inner side of the elastic action part in the initial installation state, and when the wearable part is worn to a certain extent, the wall thickness of the wearable part is reduced and it can no longer be tightly abutted against the corresponding inner cavity of the motor shaft, and the elastic component advances the wearable part to abut against the fixed main body and the elastic action part, and the action groove is formed at the fixed main body, and the action groove includes at least two depths, and the elastic action part extends toward the inner side of the motor shaft and acts on different depths of the action groove in turn, and the transmission structure and the insurance part cooperate in the shallow part of the action groove to make the insurance part descend, and release the cooperation in the deep part of the action groove, so that the transmission structure brings the insurance part to move intermittently; The action groove is provided with action parts at equal intervals, the thickness of the action parts gradually increases along the direction in which the action groove and the motor shaft are in the same direction, and a plurality of the action parts are provided at equal intervals; The insurance part has a tendency to move toward the protection switch in a natural state, and an action protrusion is arranged at intervals on the top of the insurance part toward one side of the elastic action part, the top of the action protrusion is a guide surface, and the spacing between two adjacent action protrusions is greater than or equal to 1.5 times the height of the action protrusion; the transmission structure includes a lifting part and a transverse displacement part, the lifting part is arranged on the transverse displacement part, the lifting part is connected to the outer end of the elastic action part, and the lifting part has a sliding groove in the lifting direction on the transverse displacement part; the transverse displacement part is limitedly installed, and it moves in a horizontal direction in which the elastic action part moves laterally. When the elastic action part moves toward the outside of the motor shaft, the transverse displacement part moves toward the outside and the lifting part rises at the same time, and when the elastic action part moves toward the inside of the motor shaft, the transverse displacement part moves toward the inside and the lifting part descends; when the transverse displacement part moves toward the outside of the motor shaft, the transverse displacement part acts on the action protrusion on the insurance part, so that the action protrusion moves downward; the insurance part and the corresponding action protrusion are arranged in an annular manner.

2. The driving motor carbon brush grounding system according to claim 1, characterized in that: The junction between the wear body and the inner cavity of the motor shaft is conical, and the two conical parts cooperate with each other. When the conical part of the wear body is worn, the fixed body begins to be acted upon by the elastic component. At this time, the elastic action part corresponds to the action groove, so that the elastic action part extends into the action groove. At this time, when the motor shaft rotates, the corresponding elastic action part begins to act on the action grooves of different depths in turn, thereby showing an extension and contraction action. Through the stroke transmission of the transmission structure, such an action is converted into an action of continuously lowering the safety part until the safety part acts on the protection switch.

3. The driving motor carbon brush grounding system according to claim 2, characterized in that: A support assembly is provided at the bottom of the insurance part, and the support assembly includes a hinged support platform, and the support platform is provided with a spring on the side facing the insurance part, and an action protrusion is provided on the inner side of the insurance part, and the action protrusion has a guide surface, and the transmission structure is guided by the guide surface to make the insurance part descend. When the action protrusion on the insurance part is acted to descend, the action protrusion located below and the support platform act and make the support platform rotate so that the corresponding action protrusion passes through. After the action protrusion passes, the support platform is immediately restored by the spring reset action, and the insurance part is not affected by the elastic action part and the support platform at this time until the next action protrusion abuts against the support platform; multiple action protrusions When the protrusions act on the elastic action part in sequence, the safety part descends in sequence by the distance between two adjacent action protrusions; when the motor shaft rotates, the guide surface of the action protrusion continuously acts at different depths in the action groove, and its outer side is correspondingly transmitted to the action protrusion through the transmission structure. When acting toward the action protrusion, the action protrusion is acted on by the transmission structure and descends. At this time, the bottom action protrusion passes through the support platform and reaches the bottom of the support platform. The support platform rotates to avoid and then resets. Then the second action protrusion at the bottom and the reset support platform are against each other. Then, when the motor shaft continues to rotate, the action protrusion continues to descend until the bottom of the safety part triggers the protection switch and the motor stops rotating.

4. The driving motor carbon brush grounding system according to claim 3, characterized in that: The action of the elastic action part and the action groove is divided into two stages. The first stage is that the elastic action part is at the deep part of the action groove, and the elastic action part is in an extended state. The second stage is that the motor shaft rotates so that the elastic action part gradually moves from the low point to the high point of the action component, and the corresponding elastic action part contracts. When the elastic action part and the action groove act, when the motor shaft rotates, the action component and the elastic action part begin to contact and continue to guide and push the elastic action part toward the outside until the action component passes by, the elastic action part resets and acts on the deepest part of the action groove, and multiple spaced action components perform the same action with the elastic action part in turn.

5. The driving motor carbon brush grounding system according to claim 4, characterized in that: There are four safety parts arranged in a ring shape, and the corresponding action protrusions are also arranged in a ring shape. The four safety parts are all provided with limit rods, and the distance between two adjacent safety parts is smaller than the length of the transverse displacement part. In the initial state, the action protrusion at the bottom is against the support platform.

6. The driving motor carbon brush grounding system according to claim 5, characterized in that: It also includes a conductive part, which has an elastic stroke. In the initial state, the wear part is fixed to the end of the conductive part, and the conductive part makes the wear part and the motor shaft elastically abut each other; an end cover is arranged on one side of the motor shaft, and a mounting plate is also arranged between the end cover and the motor shaft, and the lower side of the insurance part corresponds to the mounting plate. The protection switch is arranged as a travel switch with a power cut-off function installed on the mounting plate, and the travel switch is arranged perpendicular to the mounting plate, and an elastic part is arranged so that the travel switch is located at a fixed position protruding from the mounting plate in the initial state; a step is provided at the bottom of the side surface of the wear part, and the action groove is formed at the step, and the action component is arranged at the step; when the head of the wear part begins to wear, the elastic component makes the wear part move in the wear direction until the step corresponds to the elastic action part, and the elastic action part moves and abuts in the direction of the step.

7. The driving motor carbon brush grounding system according to claim 6, characterized in that: A compression spring is arranged on the top of the insurance part, and the elasticity of the compression spring is smaller than the elasticity of the spring located at the support platform; in an initial state, the compression spring abuts against the insurance part so that the corresponding action protrusion on the insurance part abuts against the support platform.

8. The driving motor carbon brush grounding system according to claim 7, characterized in that: The travel switch is connected to the leakage protection switch of the motor, and a sensor is provided at the support platform to identify its movement. The sensor is connected to the electronic control system. When the wear part is worn, the insurance part is continuously driven to move toward one side of the support platform. The sensor receives the identification signal at intervals and the electronic control system provides real-time feedback. When the insurance part triggers the travel switch, the leakage protection switch cuts off the power supply of the motor.

Images