Servo motor with good dustproof effect

Abstract

The application relates to the technical field of dustproof and heat dissipation of a servo motor, and discloses a servo motor with good dustproof effect, which comprises a shell, a connecting sleeve, a circulating sleeve and a transmission shaft, conveying leaves in the transmission shaft drive gas circulation through a through groove, an inclined spray hole and a horn mouth, heat is dissipated by heat dissipation fins in the connecting sleeve in cooperation with a circumferential wheel, a left cavity, a middle cavity and a right cavity form a closed and uniform heating loop through homodromous one-way pipes, a taper sleeve in the circulating sleeve is provided with staggered sleeves and filter plates which can be switched between a sealed position and a filter air inlet position, an air outlet hole is opened and closed through an air outlet bolt, after switching, external gas is filtered into the loop and carries internal dust to be discharged from the air outlet hole, so that the motor reduces heat breathing and dust inhalation during normal operation, and can regularly use clean airflow to discharge dust.

Description

Technical Field

[0001] This invention relates to the field of dustproof and heat dissipation technology for servo motors, and more specifically, to a servo motor with good dustproof performance that can switch between a closed internal circulation heat dissipation state and a filtered air intake and dust exhaust state. Background Technology

[0002] During continuous operation, the heat generated by the stator, rotor and bearing areas of the servo motor will raise the temperature of the gas inside the housing. After the internal gas expands due to heat, it is easy to slowly discharge from the end cover mating surface, shaft extension sealing position and fastening gap. When the motor stops or the load is reduced, the internal gas cools and contracts, and a relative negative pressure is formed inside the housing. Dust-laden gas from the outside may be sucked in along the original gap. After multiple hot and cold cycles, dust is easy to accumulate on the heat-generating parts and insulation surfaces.

[0003] Existing hermetic servo motors typically rely on the outer surface of the housing for heat dissipation, resulting in insufficient gas flow in different areas inside. The temperature rises faster near the heat source while the temperature of the end cavity remains lower. This localized high temperature not only affects the working environment of the windings and bearings but also amplifies the pressure variation between operation and shutdown, making the dust-attracting tendency caused by thermal breathing more pronounced.

[0004] Some motors have ventilation holes and filters on the housing or end cover to allow hot air inside to escape and prevent larger particles from entering. However, continuous connection with the outside will cause the filter to be in a dust-collecting state for a long time. As the filter surface gradually becomes clogged, the ventilation resistance increases, and fine dust may still pass through the filter and enter the interior. Moreover, it is difficult for maintenance personnel to use the airflow of the motor itself to directionally remove the dust that has entered the interior.

[0005] Another internal circulation cooling structure uses blades on the shaft to drive the gas to flow inside the motor. This method can improve the temperature distribution, but the circulation air path is usually kept in a single closed state and cannot be converted into a filtered one-way blowing path when maintenance is required. The internal dust can only be cleaned by disassembling the end cover or using an external blowing device, which increases the maintenance workload and is also easy to damage the original sealing relationship during disassembly and assembly.

[0006] Therefore, a servo motor is needed to enable the airflow driven by the drive shaft to form a closed loop along the left cavity, middle cavity and right cavity during normal operation and to be heated evenly by the heat sink. After the maintenance cycle is reached, the same air path can be switched to a filtered air intake and directional exhaust path through a few detachable parts, reducing heat breathing dust from the source and actively carrying out the internal dust. Summary of the Invention

[0007] The purpose of this invention is to solve the technical problems of uneven internal temperature distribution in servo motors leading to large thermal breathing pressure differences, easy entry of external dust-laden gas through assembly gaps, and difficulty in removing internal dust without disassembling the machine, and to provide a servo motor with good dustproof performance.

[0008] The housing has a detachable connecting sleeve and a circulation sleeve at each end. The housing has an internal cavity, the connecting sleeve has a left cavity, and the circulation sleeve has a right cavity. The drive shaft passes through the housing and rotates relative to it. The connecting sleeve and circulation sleeve serve to seal the ends and also form a heat dissipation end and an air path switching end, respectively.

[0009] Multiple sets of heat sinks are arranged circumferentially on the inner wall of the connecting sleeve. A circumferential wheel is fixedly installed on the part of the drive shaft located in the left cavity. A through groove is opened along the axial direction inside the drive shaft. A conveying blade that rotates with the drive shaft is installed in the through groove. The end of the through groove facing the connecting sleeve is connected to the left cavity through multiple circumferentially spaced oblique spray holes. A flared mouth is provided on the end of the through groove facing the circulation sleeve.

[0010] When the conveying blade rotates with the drive shaft, it applies an axial conveying action to the gas in the through slot. The gas enters the through slot through the flared mouth and then enters the left cavity through the oblique spray hole. The circumferential wheel rotates with the drive shaft and diffuses the gas sent out by the oblique spray hole along the circumference of the connecting sleeve, so that the gas flows to the middle cavity after passing through multiple sets of heat sinks.

[0011] Multiple one-way pipes with openings facing the circulation sleeve are arranged axially inside the shell. One set of one-way pipes connects the left cavity and the middle cavity, and another set of one-way pipes connects the middle cavity and the right cavity, so that the gas can only flow in the order of the left cavity, the middle cavity and the right cavity. The gas in the right cavity then returns to the through slot through the flared mouth, thus forming a closed loop.

[0012] Each one-way tube is equipped with a guide frame, and a one-way disc is slidably installed inside the guide frame. A return spring is installed between the one-way disc and the guide frame. When the positive pressure difference is greater than the return force of the return spring, the one-way disc leaves the sealed position and allows gas to pass through. When the pressure difference decreases or a reverse pressure difference occurs, the return spring pushes the one-way disc to reset, preventing the circulating gas from flowing back in the opposite direction.

[0013] A conical sleeve is set inside the circulating sleeve. Multiple stop blocks are arranged circumferentially on the inner wall of the conical sleeve. An interleaved sleeve is slidably set inside the conical sleeve. A side groove corresponding to the stop block is opened on the outer wall of the interleaved sleeve. The end of the interleaved sleeve facing the flared mouth extends into the conical sleeve and is coaxial with the flared mouth while maintaining a gap. The interleaved sleeve can select whether the stop block abuts its end or enters the side groove by rotation.

[0014] When the staggered sleeve is in the sealed position, the stop block abuts against the staggered sleeve without entering the side groove, the staggered sleeve does not extend into the inside of the cone sleeve, the filter plate is pressed onto the staggered sleeve, the fixing ring is threadedly connected to the cone sleeve and presses the filter plate, and the sealing bolt is threadedly connected to the cone sleeve and presses the fixing ring, so that the external air inlet end of the cone sleeve is in a sealed state.

[0015] When the interleaved sleeve is in the filter inlet position, first remove the sealing bolt, fixing ring and filter plate, then rotate the interleaved sleeve to make the stop block enter the side groove and push the interleaved sleeve to slide inward along the cone sleeve. After the interleaved sleeve is in place, its inner end is close to the horn but does not contact the horn. Then put the filter plate back in and press the filter plate with the fixing ring, while keeping the sealing bolt separated from the cone sleeve, so that the outside gas can enter the interleaved sleeve through the filter plate.

[0016] The circulation sleeve has multiple vent holes that communicate with the right cavity. Each vent hole is threaded with a vent bolt. During normal operation, the vent bolts close the vent holes. During dust removal and maintenance, the vent bolts are removed to allow the right cavity to form multiple exhaust outlets with the outside.

[0017] Under normal operating conditions with the conical sleeve sealed and the vent hole closed, the gas in the right cavity driven by the conveyor blade enters the through slot through the bell mouth, enters the left cavity through the oblique spray hole, and is sent to the heat sink by the circumferential wheel. Then, it enters the middle cavity and the right cavity in sequence through two sets of one-way pipes. The gas carries the heat of the middle cavity and exchanges heat at the heat sink, thereby reducing the temperature difference and pressure fluctuation between the cavities.

[0018] When the cone sleeve is switched to the filter intake state and the air outlet is open, the conveying blades form a suction effect at the horn mouth. The outside gas passes through the filter plate and the staggered sleeve in sequence and enters the horn mouth. The clean gas then flows along the through groove, the oblique spray hole, the left cavity, the one-way pipe, the middle cavity and the right cavity, and finally exits from the air outlet, carrying the floating dust in the air path and cavity to the outside of the motor.

[0019] After dust removal is completed, screw the exhaust bolt back into the exhaust hole, remove the retaining ring and filter plate, and move the interlocking sleeve outward along the side groove. Then rotate the interlocking sleeve so that the stop block abuts against the end of the interlocking sleeve again. After putting the filter plate and retaining ring back in, screw in the sealing bolt. The servo motor will then return to the closed internal circulation and uniform heating state.

[0020] The through groove, conveying blade, oblique spray hole and horn mouth in the drive shaft together with two sets of unidirectional pipes to form a closed circulation air path. The gas in the right cavity can pass through the left cavity and the middle cavity in sequence and then return to the right cavity. The circumferential wheel disperses the gas sent out by the oblique spray hole to multiple sets of heat sinks in the connecting sleeve, so that the heat from different positions in the middle cavity is continuously carried to the heat dissipation end, reducing local temperature rise and internal pressure fluctuations caused by temperature changes.

[0021] The cone sleeve, stop block, side groove and staggered sleeve constitute a repeatedly switchable air intake state control structure. When the staggered sleeve is in the sealed position, it is pressed by the filter plate, fixing ring and sealing bolt in sequence. During normal operation of the motor, it does not need to continuously draw air from the outside, which can reduce the chance of long-term dust accumulation and blockage of the filter and the entry of external dust into the interior.

[0022] During dust removal, simply switch the staggered sleeve to the filter inlet position, retain the filter plate, and remove the sealing bolt and outlet bolt. The same conveying blade can filter the outside air and send it into the original circulating air path. The clean gas sweeps through the interior in the order of the left cavity, the middle cavity, and the right cavity and is discharged from the outlet hole, making the uniform heat air path also a directional dust removal path. There is no need to disassemble the shell or install an internal blowing pipe.

[0023] The one-way disc is opened by positive pressure difference in the guide frame and reset by the reset spring, so that normal internal circulation and maintenance dust discharge maintain the same flow direction, avoiding the reverse flow of dust-laden gas between the chambers; the inner end of the staggered sleeve is close to the horn mouth and maintains a non-contact interval, which shortens the intake path of the filtered gas into the through slot and avoids friction between the rotating drive shaft and the fixed air intake structure. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional view of the present invention and a schematic diagram of its internal circulating air path; Figure 3 This is a schematic diagram of the connecting sleeve, heat sink, and circumferential wheel in this invention; Figure 4 This is a cross-sectional view of the conical sleeve in the sealed state in this invention. Figure 5 This is a cross-sectional view of the cone sleeve in the filtering and air intake state in this invention. Figure 6 This is a schematic diagram of the structure of the shell and the one-way tube in this invention; Figure 7 This is a cross-sectional view of the one-way tube, guide frame, one-way disk, and return spring in this invention. Figure 8 This is a schematic diagram of the structure of the drive shaft, through groove, conveying blade, oblique spray hole and flare mouth in this invention.

[0025] Reference numerals: 1. Housing; 2. Connecting sleeve; 3. Circulating sleeve; 4. Drive shaft; 5. Intermediate cavity; 6. Left cavity; 7. Right cavity; 8. Heat sink; 9. Circumferential wheel; 10. Through groove; 11. Conveyor blade; 12. Slanted spray hole; 13. Trumpet mouth; 14. Conical sleeve; 15. Air outlet; 16. Air outlet bolt; 17. Stop block; 18. Interlaced sleeve; 19. Side groove; 20. Filter plate; 21. Fixing ring; 22. Sealing bolt; 23. One-way tube; 24. Guide frame; 25. One-way disc; 26. Return spring. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The described embodiments are only used to explain the present invention and are not intended to limit the scope of protection of the present invention.

[0027] In the description of this invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", "axial", and "circumferential" 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.

[0028] See Figures 1 to 8 In this embodiment, the servo motor includes a housing 1, a connecting sleeve 2, a circulating sleeve 3, and a drive shaft 4. The connecting sleeve 2 and the circulating sleeve 3 are detachably installed at both ends of the housing 1. The drive shaft 4 is arranged along the axial direction of the housing 1 and rotatably connected to the housing 1. An intermediate cavity 5 is formed inside the housing 1 to accommodate the heating components of the motor. A left cavity 6 is formed inside the connecting sleeve 2, and a right cavity 7 is formed inside the circulating sleeve 3. The three cavities are isolated from the outside after assembly.

[0029] Multiple sets of heat sinks 8 are evenly spaced along the circumference on the inner wall of the connecting sleeve 2. The heat sinks 8 extend from the inner wall of the connecting sleeve 2 toward the left cavity 6 and form a thermally conductive connection with the connecting sleeve 2. A circumferential wheel 9 is fixedly installed at the part of the drive shaft 4 located inside the left cavity 6. After the circumferential wheel 9 rotates with the drive shaft 4, the gas entering the left cavity 6 diffuses along the circumference of the connecting sleeve 2, avoiding the gas from only passing through the local heat sinks 8 and causing the heat exchange area to be concentrated.

[0030] A through groove 10 is opened along the axial direction inside the drive shaft 4. A conveying blade 11 is installed in the through groove 10. The conveying blade 11 is connected to the drive shaft 4 and rotates synchronously with the drive shaft 4. Multiple oblique spray holes 12 are opened on the side of the through groove 10 facing the connecting sleeve 2. The multiple oblique spray holes 12 are distributed at intervals along the circumference of the drive shaft 4 and are respectively connected to the left cavity 6. A flared mouth 13 is opened at the end of the through groove 10 facing the circulation sleeve 3.

[0031] When the blade direction of the conveyor blade 11 causes the drive shaft 4 to rotate in the working direction of the servo motor, it draws in gas from the side of the horn 13 and delivers it to the side of the oblique nozzle 12. The oblique nozzle 12 is set radially relative to the drive shaft 4, so that the gas has both radial and circumferential speed when it leaves the through groove 10. The circumferential wheel 9 then diffuses the gas and distributes the airflow between multiple sets of heat sinks 8.

[0032] A cone sleeve 14 is fixedly installed inside the circulation sleeve 3. The cone sleeve 14 is coaxial with the flared mouth 13 of the drive shaft 4. An interlaced sleeve 18 that can slide axially and rotate around the axis is installed inside the cone sleeve 14. One end of the interlaced sleeve 18 facing the flared mouth 13 extends into the cone sleeve 14. After the interlaced sleeve 18 moves inward to the filter air intake position, its inner end is close to the flared mouth 13 but retains a rotation gap with the flared mouth 13.

[0033] Multiple stop blocks 17 are evenly spaced along the circumference on the inner wall of the tapered sleeve 14, and multiple side grooves 19 are opened along the axial direction on the outer wall of the staggered sleeve 18. The number and circumferential position of the side grooves 19 correspond to the stop blocks 17 respectively. When the staggered sleeve 18 is at the first angle, the stop blocks 17 abut against the outward end of the staggered sleeve 18 and prevent it from sliding inward. When the staggered sleeve 18 is at the second angle, the stop blocks 17 enter the side grooves 19 and allow the staggered sleeve 18 to slide inward along the tapered sleeve 14.

[0034] The filter plate 20 is slidably disposed inside the cone sleeve 14 and located outside the staggered sleeve 18. The outer periphery of the filter plate 20 is adapted to the inner wall of the cone sleeve 14. The fixing ring 21 is threadedly connected inside the cone sleeve 14 and can press the filter plate 20 tightly. The sealing bolt 22 is threadedly connected to the outer end of the cone sleeve 14. During normal operation, the staggered sleeve 18 is held in a non-extended position by the stop block 17. The filter plate 20, the fixing ring 21 and the sealing bolt 22 are pressed together from the inside to the outside to seal the cone sleeve 14.

[0035] Multiple air vents 15 are evenly spaced along the outer periphery of the circulation sleeve 3. Each air vent 15 is connected to the right cavity 7 and has threads on its inner wall. Each air vent 15 is threaded with an air vent bolt 16. After the air vent bolt 16 is tightened, the corresponding air vent 15 is closed. After all the air vent bolts 16 are removed, the right cavity 7 can exhaust air evenly through the multiple air vents 15.

[0036] Multiple sets of one-way pipes 23 are installed inside the housing 1. All one-way pipes 23 are arranged along the axial direction of the housing 1 and the opening direction that allows gas flow is directed towards the circulation sleeve 3. The inlet of one set of one-way pipes 23 is connected to the left cavity 6 and the outlet is connected to the middle cavity 5. The inlet of another set of one-way pipes 23 is connected to the middle cavity 5 and the outlet is connected to the right cavity 7. Thus, the left cavity 6, the middle cavity 5 and the right cavity 7 are connected in series.

[0037] Each one-way tube 23 is fixedly provided with a guide frame 24, and a one-way disc 25 is slidably provided in the guide frame 24 along the axial direction of the one-way tube 23. The one-way disc 25 has a sealing surface adapted to the inner wall of the one-way tube 23. One end of the return spring 26 is connected to or abuts the one-way disc 25 and the other end abuts the guide frame 24. The return spring 26 continuously applies a thrust to the one-way disc 25 to return it to the inlet direction.

[0038] When the pressure on the inlet side of the one-way pipe 23 is higher than the pressure on the outlet side and the pressure difference force is greater than the reset force of the return spring 26, the one-way disc 25 slides along the guide frame 24 toward the outlet direction and leaves the sealed position. The gas can bypass the one-way disc 25 and flow to the next chamber. When the pressure difference decreases, the return spring 26 pushes the one-way disc 25 to re-fit the sealed position. When the outlet side pressure is high, the one-way disc 25 is subjected to reverse pressure and cannot be opened.

[0039] After the servo motor starts running, the drive shaft 4 drives the conveyor blade 11 and the circumferential wheel 9 to rotate synchronously. With the cone sleeve 14 closed by the sealing bolt 22 and the air outlet 15 closed by the air outlet bolt 16, the gas in the right cavity 7 is drawn in by the conveyor blade 11 and enters the through groove 10 from the horn mouth 13. Then, it is pushed by the conveyor blade 11 along the axial direction of the drive shaft 4 to multiple oblique spray holes 12.

[0040] After the gas enters the left cavity 6 through multiple oblique nozzles 12, it tends to diffuse in the circumferential direction. The circumferential wheel 9 continues to push the gas through multiple sets of heat sinks 8 on the inner wall of the connecting sleeve 2. The heat sinks 8 transfer the heat carried by the gas to the connecting sleeve 2, and the connecting sleeve 2 then exchanges heat with the outside air. The gas passing through the heat sinks 8 forms a pressure in the left cavity 6 that is higher than that in the middle cavity 5.

[0041] The pressure inside the left cavity 6 opens the one-way disk 25 in the first set of one-way tubes 23, and the gas passing through the heat sink 8 enters the intermediate cavity 5 and flows along the inside of the housing 1. When the gas flows around the stator and rotor, it absorbs heat from different locations in the intermediate cavity 5. After the pressure inside the intermediate cavity 5 increases, it opens the one-way disk 25 in the second set of one-way tubes 23 and enters the right cavity 7.

[0042] The gas entering the right cavity 7 is drawn into the channel 10 again by the horn 13 and the conveying blade 11, thus forming a closed loop path in which the right cavity 7, the channel 10, the oblique spray hole 12, the left cavity 6, the first set of one-way pipes 23, the intermediate cavity 5, the second set of one-way pipes 23 and the right cavity 7 are connected in sequence. When the drive shaft 4 continues to rotate, this path continuously delivers gas and carries the heat of the intermediate cavity 5 to the heat sink 8.

[0043] The closed loop does not continuously replenish air from the outside. During normal operation of the motor, the filter plate 20 does not bear the continuous dust suction load. After the air outlet 15 and the cone sleeve 14 are kept closed, there is no way for external dust to enter the interior with the heat exchange airflow. At the same time, after the temperature difference between each cavity decreases, the amplitude of internal gas expansion due to heat and contraction due to cooling is reduced accordingly, and the driving force for thermal breathing at the assembly gap is limited.

[0044] When the servo motor reaches the set maintenance cycle or dust accumulation is detected inside, first stop the motor and remove the sealing bolt 22 at the outer end of the cone sleeve 14, then unscrew the fixing ring 21 and remove the filter plate 20. Then rotate the staggered sleeve 18 so that the multiple stop blocks 17 are aligned with the side groove 19 respectively, and push the staggered sleeve 18 to move inward along the cone sleeve 14 until the stop blocks 17 reach the end of the side groove 19.

[0045] When the interlaced sleeve 18 moves inward, its inner end approaches the flared mouth 13. A gap is maintained between the interlaced sleeve 18 and the flared mouth 13 to allow the drive shaft 4 to rotate freely. After the interlaced sleeve 18 is in place, the filter plate 20 is put back into the cone sleeve 14 and the fixing ring 21 is screwed in to press the filter plate 20. At this time, the sealing bolt 22 is not installed so that the outer end of the cone sleeve 14 can communicate with the outside through the filter plate 20.

[0046] Remove multiple air outlet bolts 16 to connect the air outlet 15 to the right cavity 7. After restarting the servo motor, the conveyor blade 11 forms a negative pressure at the horn mouth 13. Outside air first passes through the filter plate 20, and the dust in the air is trapped by the filter plate 20. The filtered clean air then enters the horn mouth 13 through the staggered sleeve 18.

[0047] Clean air entering the horn mouth 13 flows along the through groove 10 to the oblique spray hole 12 and enters the left cavity 6. The circumferential wheel 9 disperses the clean air between the heat sinks 8. Then the clean air opens the first set of one-way pipes 23 and enters the intermediate cavity 5, forming a directional sweep of the floating dust on the inner wall of the intermediate cavity 5 and around the heating components, and carrying the floating dust to one side of the circulation sleeve 3.

[0048] After the dust-laden gas enters the right cavity 7 from the middle cavity 5 through the second set of one-way pipes 23, it does not return to the through slot 10. This is because the cone sleeve 14 continuously provides filtered supplementary air and the right cavity 7 is connected to the outside through the air outlet 15. The dust-laden gas is discharged from multiple air outlets 15 under the push of the subsequent clean airflow. The multiple circumferentially distributed air outlets 15 reduce the limitation of a single outlet on the dust discharge range in the right cavity 7.

[0049] In the dust removal state, the same conveyor blade 11, through groove 10, oblique spray hole 12 and two sets of one-way pipes 23 are used as in the closed circulation. The one-way disc 25 restricts the flow of gas from the left cavity 6 to the middle cavity 5 and then to the right cavity 7. Therefore, the clean gas will not push the dust back to the middle cavity 5 from the right cavity 7. The filter inlet and outlet are located at the beginning and end of the circulation path, respectively.

[0050] After dust removal is completed, stop the servo motor and clean or replace the filter plate 20. After unscrewing the fixing ring 21, move the interlaced sleeve 18 outward along the side groove 19. Then rotate the interlaced sleeve 18 so that the stop block 17 leaves the side groove 19 and abuts against the end of the interlaced sleeve 18. Then install the filter plate 20, fixing ring 21 and sealing bolt 22. At the same time, screw the air outlet bolt 16 back into the air outlet hole 15.

[0051] After the staggered sleeve 18 returns to the sealed position, its inner end moves away from the horn 13. The filter plate 20 is pressed by the fixing ring 21 and the sealing bolt 22 and cannot form a continuous air intake passage. The exhaust bolt 16 seals the external exhaust passage of the right cavity 7. The servo motor re-establishes an internal circulation state isolated from the outside world. During subsequent operation, the gas continues to circulate between the heat sink 8 and the intermediate cavity 5.

[0052] After the connecting sleeve 2 and the circulating sleeve 3 are detachably connected, the heat sink 8, the circumferential wheel 9, the conical sleeve 14, the filter plate 20 and the two end cavities can be exposed during maintenance. Maintenance personnel can clean the heat sink 8 and the filter plate 20 without disassembling the electromagnetic components inside the housing 1, check the sliding state of the interlaced sleeve 18 and replace the return spring 26 or the one-way disc 25.

[0053] In this embodiment, the number and radial length of the heat sink 8 can be determined according to the power of the servo motor and the external heat exchange conditions of the connecting sleeve 2. The inclination direction of the oblique spray hole 12 should match the working direction of the drive shaft 4, and the spiral direction of the conveying blade 11 should ensure that the gas is conveyed from the horn mouth 13 to the oblique spray hole 12, so that the closed circulation and dust filtration adopt the same flow direction.

[0054] The filter plate 20 can be made of replaceable filter material that can trap dust in the working environment and allow the required amount of exhaust air to pass through. The fixing ring 21 only serves to press and position the filter in the air intake state. The sealing bolt 22 serves to seal the outer end of the cone sleeve 14 in the normal operating state. The two are set separately so that the filter plate 20 remains stable during dust discharge while the air intake end remains open.

[0055] The above embodiments are used to illustrate the structure and working principle of the present invention. Those skilled in the art can make equivalent substitutions for the number of heat sinks, the number of oblique spray holes, the number of stop blocks and side grooves, the filter plate material, the number of air outlets, and the arrangement position of the one-way pipe without departing from the core concept of the present invention. The scope of protection of the present invention shall be determined by the claims and their equivalents.

Claims

1. A servo motor with good dustproof performance, comprising a housing (1) and a transmission shaft (4) rotatably disposed within the housing (1), characterized in that: The housing (1) is detachably equipped with a connecting sleeve (2) and a circulation sleeve (3) at both ends. The housing (1), the connecting sleeve (2), and the circulation sleeve (3) respectively form an intermediate cavity (5), a left cavity (6), and a right cavity (7). A heat sink (8) is provided on the inner wall of the connecting sleeve (2). A circumferential wheel (9) is provided on the drive shaft (4). A through groove (10) is opened in the drive shaft (4). A conveying blade (11) is provided in the through groove (10). One end of the through groove (10) is connected to the left cavity through an oblique spray hole (12). The cavity (6) is connected to the right cavity (7) through the flared mouth (13) at the other end; a one-way pipe (23) is provided in the housing (1) to connect the left cavity (6), the middle cavity (5) and the right cavity (7) in sequence; a cone sleeve (14) is provided in the circulation sleeve (3), and an interlaced sleeve (18) and a filter plate (20) are provided in the cone sleeve (14) to switch between the sealed position and the filter air inlet position; the air outlet (15) on the circulation sleeve (3) is threadedly connected to the air outlet bolt (16).

2. The servo motor with good dustproof effect according to claim 1, characterized in that: Multiple heat sinks (8) are spaced apart along the inner wall of the connecting sleeve (2), and a circumferential wheel (9) is fixedly mounted on the drive shaft (4) and located in the left cavity (6). Multiple oblique spray holes (12) are spaced apart along the circumferential direction of the drive shaft (4) and face the heat sinks (8).

3. The servo motor with good dustproof effect according to claim 1, characterized in that: The through groove (10) extends along the axial direction of the drive shaft (4), the conveying blade (11) is disposed in the through groove (10), the flared mouth (13) is disposed at one end of the through groove (10) facing the circulation sleeve (3), the staggered sleeve (18) extends towards the inside of the cone sleeve (14) at one end facing the flared mouth (13), and the inner end of the staggered sleeve (18) is coaxially spaced with the flared mouth (13).

4. A servo motor with good dustproof effect according to claim 3, characterized in that: Multiple stop blocks (17) are arranged circumferentially on the inner wall of the cone sleeve (14). Side grooves (19) corresponding to the stop blocks (17) are opened on the outer wall of the staggered sleeve (18). The staggered sleeve (18) can switch between the sealing position where the stop block (17) abuts its end and the filter air intake position where the stop block (17) slides in the side groove (19) by rotation.

5. A servo motor with good dustproof effect according to claim 4, characterized in that: The filter plate (20) is set inside the cone sleeve (14) and located outside the cross sleeve (18). The cone sleeve (14) is threaded with a fixing ring (21) and a sealing bolt (22). When the cross sleeve (18) is in the sealed position, the filter plate (20), the fixing ring (21) and the sealing bolt (22) press and seal the cone sleeve (14) in sequence.

6. A servo motor with good dustproof effect according to claim 5, characterized in that: When the staggered sleeve (18) is in the filter inlet position, the stop block (17) slides along the side groove (19) to the end of the side groove (19), the filter plate (20) is pressed on the staggered sleeve (18) and fixed by the fixing ring (21), and the sealing bolt (22) separates from the cone sleeve (14).

7. A servo motor with good dustproof effect according to claim 1, characterized in that: Multiple air outlets (15) are spaced apart along the circumference of the circulation sleeve (3) and communicate with the right cavity (7). Each air outlet (15) is threaded with an air outlet bolt (16).

8. A servo motor with good dustproof effect according to claim 1, characterized in that: Multiple one-way tubes (23) are arranged along the axial direction of the housing (1) toward the circulation sleeve (3), one set of one-way tubes (23) connects the left cavity (6) and the middle cavity (5), and another set of one-way tubes (23) connects the middle cavity (5) and the right cavity (7).

9. A servo motor with good dustproof effect according to claim 8, characterized in that: A guide frame (24) is provided inside the one-way tube (23), and a one-way disc (25) is slidably provided inside the guide frame (24). A reset spring (26) is provided on the one-way disc (25), and the other end of the reset spring (26) abuts against the guide frame (24). The one-way disc (25) can leave the sealed position of the one-way tube (23) under the action of positive pressure difference.

10. A servo motor with good dustproof effect according to claim 9, characterized in that: When the cone sleeve (14) is in the filter intake state and the air outlet bolt (16) is separated from the air outlet (15), the filter plate (20), the staggered sleeve (18), the horn mouth (13), the through groove (10), the oblique spray hole (12), the left cavity (6), the one-way pipe (23), the middle cavity (5), the right cavity (7) and the air outlet (15) sequentially form a filter dust discharge passage.

Images