A stepping motor with waterproof and dustproof functions

Abstract

The present invention discloses a stepper motor with waterproof and dustproof functions, and aims to provide a stepper motor with waterproof and dustproof functions installed with a component that can automatically open the moisture or dust blocking work. It includes a shell, a front cover, a rear cover and a rotor are installed on the shell, a cavity is provided in the shell, a vent hole 1 and a flip cover slot are provided on the front cover, the vent hole 1 and the flip cover slot both contain a plurality of vent holes, the flip cover slot corresponds to the vent holes one by one, a flip cover is installed in the flip cover slot, the flip cover is detachably connected to the front cover, the position of the flip cover corresponds to the position of the vent hole 1 front and back, the rotor is placed in the cavity, a mandrel is installed on the rotor, the rear end of the mandrel is detachably connected to the rear cover, the front end passes through the front cover and is placed outside the shell, and the mandrel is detachably connected to the front cover. The beneficial effects of the present invention are: the purpose of installing a component that can automatically open the moisture or dust blocking work can be achieved; the vibration of the shell is reduced; and a component that prevents the rotor from being damaged by friction is installed.

Description

Technical Field

[0001] The invention relates to the technical field of stepper motors, and in particular to a stepper motor with waterproof and dustproof functions. Background Art

[0002] The stepper motor is an open-loop control motor that converts electrical pulse signals into angular displacement or linear displacement. It is the main actuator in modern digital program control systems and is widely used. Its working principle is to use electronic circuits to convert direct current into a time-sharing power supply, a multi-phase timing control current. This current is used to power the stepper motor, so that the stepper motor can work normally. The driver is a multi-phase timing controller that supplies power to the stepper motor in a time-sharing manner. In the case of non-overload, the speed and stop position of the motor only depend on the frequency and number of pulses of the pulse signal, and are not affected by load changes. When the stepper driver receives a pulse signal, it drives the stepper motor to rotate a fixed angle in the set direction, called the "step angle", and its rotation runs step by step at a fixed angle. The angular displacement can be controlled by controlling the number of pulses to achieve the purpose of accurate positioning; at the same time, the speed and acceleration of the motor rotation can be controlled by controlling the pulse frequency to achieve the purpose of speed regulation.

[0003] As a motor, it pays great attention to the interference of the external environment, which can affect the working efficiency of the stepper motor and even cause short circuit or other serious safety problems due to interference from external objects. This not only affects the working efficiency of the stepper motor, but may even cause the stepper motor to burn out and be scrapped during work, which is unsafe and unreliable.

[0004] Chinese Patent Authorization Announcement Number: CN210074962U, Authorization Announcement Date February 14, 2020, discloses a hybrid waterproof stepping motor, including a shell, a front cover and a rear cover are respectively installed at both ends of the shell, and a stator is arranged inside the shell, a rotor is installed inside the stator, a core shaft is arranged inside the rotor, one end of the core shaft extends toward the front cover and is sleeved with the front cover, a first partition plate and a second partition plate are arranged inside the shell, the second partition plate is located near the rear cover, the stator and the rotor are located between the first partition plate and the second partition plate, the core shaft is sleeved with the first partition plate, and a skeleton oil seal is installed on the core shaft, the skeleton oil seal is located between the core shaft and the first partition plate, the first partition plate and the second partition plate are both with a copper plate, and heat dissipation holes are provided on the front cover and the rear cover. The shortcoming of this technical solution is that, although the heat dissipation holes distributed on the front cover and the rear cover can dissipate the heat in the shell, they cannot block the entry of moisture or dust outside the shell. This will cause moisture or dust to be distributed in the shell, affecting the normal operation of the motor.

[0005] In summary, a waterproof and dustproof structure may be provided at the heat dissipation structure to prevent moisture or dust from entering the motor and affecting the normal operation of the motor. Summary of the invention

[0006] The present invention is to overcome the deficiency of the prior art that moisture or dust outside the housing cannot be blocked from entering the motor, and provides a stepper motor with waterproof and dustproof function installed with a component that can automatically start moisture or dust blocking work. In order to achieve the above purpose, the present invention adopts the following technical scheme: a stepper motor with waterproof and dustproof function, including a housing, a front cover, a rear cover and a rotor are installed on the housing, a cavity is provided in the housing, the front cover is placed at the front end of the housing, a vent hole 1 and a flip cover slot are provided on the front cover, the vent hole 1 and the flip cover slot both contain a plurality of vent holes, the flip cover slot corresponds to the vent hole one by one, a flip cover is installed in the flip cover slot, the flip cover is detachably connected to the front cover, the position of the flip cover corresponds to the position of the vent hole 1 in front and back, the rear cover is placed at the rear end of the housing, the rotor is placed in the cavity, a mandrel is installed on the rotor, the rear end of the mandrel is detachably connected to the rear cover, the front end of the mandrel passes through the front cover and is placed outside the housing, and the mandrel is detachably connected to the front cover. This design allows the rotor to be installed through the cavity of the shell, allowing the front end of the core shaft on the rotor to pass through the front cover at the front end of the shell and be placed outside the shell, and the rear end of the core shaft is detachably connected to the rear cover at the rear end of the shell. Here, the detachable connection between the front cover and the rear cover and the core shaft allows the core shaft to rotate smoothly under the support effect of the front cover and the rear cover, which not only works stably, but also the front cover and the rear cover will not affect the rotation of the core shaft, so that the stepper motor can work smoothly. The vent hole set on the front cover allows the heat in the cavity of the shell to dissipate. Not only that, the flap groove on the front cover corresponds to the vent hole one by one, and the flap installed in the flap groove is detachably connected to the front cover, so that when the heat in the cavity is dissipated under the action of the airflow, the flap can be pushed open, which not only allows the heat to be discharged smoothly, but also drives the dust or gaseous water vapor in the cavity to be discharged, and prevents the rotor from working in a humid or dusty environment. When the stepper motor does not work, the flap can automatically block the vent hole 1 to prevent moisture or dust outside the stepper motor from entering and affecting the operation of the stepper motor, thus achieving the purpose of installing a component that can automatically open moisture or dust to block the operation. Preferably, the rear end of the vent hole 1 is connected to the cavity, the flap groove is placed at the front end of the vent hole 1, a micro rolling bearing is installed in the flap groove, a rolling shaft is installed on the inner ring of the micro rolling bearing, the micro rolling bearing is connected to the front cover through the rolling shaft, and the flap is connected to the outer ring of the micro rolling bearing. In this design, the rear end of the vent hole 1 is connected to the cavity, and the flap groove is placed at the front end of the vent hole 1. The inner ring of the micro rolling bearing can be connected to the flap groove at the front end of the vent hole 1 using a rolling shaft, so the outer ring of the micro rolling bearing can be connected to the flap, so that the flap is impacted by the airflow with heat in the cavity, and the vent hole 1 can be opened to allow the airflow to drive the heat, or even dust or water vapor to be discharged.Until the flap is not impacted by the airflow, then under the action of the micro rolling bearing, the flap can automatically flip toward the vent hole 1 until the vent hole 1 is closed, thereby preventing moisture or dust from entering the stepper motor, which is safe and reliable. Preferably, a rolling bearing 1 and a fixing ring are installed on the front cover, and the front end of the mandrel passes through the rolling bearing 1 and the fixing ring in turn and is placed outside the housing, and a rolling bearing 2 is installed on the rear cover, and the rear end of the mandrel is connected to the rolling bearing 2. In this design, the front end of the mandrel can pass through the rolling bearing 1 installed on the front cover, and then the mandrel can pass through the fixing ring. Here, the rolling bearing 1 allows the mandrel to rotate smoothly under the support effect of the front cover, and the fixing ring increases the length of the support structure of the mandrel, making the rotation of the mandrel more stable. The rolling bearing 2 on the rear cover allows the rear end of the mandrel to rotate smoothly under the support effect of the rear cover, so that the rotation of the mandrel is carried out in a stable environment, which is simple and safe. Preferably, the rear cover is evenly distributed with several vents 2, the rolling bearing 2 is placed at the front end of the rear cover, and the rear end of the rear cover is installed with an activated carbon filter. This design is convenient for the heat in the cavity to be dispersed out through the evenly distributed several vents 2 on the rear cover, and the rolling bearing 2 is installed at the front end of the rear cover so that the mandrel can rotate smoothly under the support effect of the rear cover. At the same time, the activated carbon filter installed at the rear end of the rear cover plays the role of adsorbing and filtering moisture and dust in the external air flow, thus preventing moisture and dust from the outside from entering the cavity. Preferably, a stator ring and two partitions are installed in the cavity, the stator ring is sleeved on the inner wall of the shell, the rotor is sleeved in the stator ring, the two partitions are respectively placed at the front and rear ends of the stator ring, the front and rear ends of the rotor are respectively connected to the two partitions, and the partitions are evenly distributed with several heat dissipation holes. This design can form a closed space by cooperating with the stator ring through the two partitions placed at the front and rear ends of the stator ring to prevent moisture and dust from entering the outside. The rotor is set in the stator ring, and there are several heat dissipation holes evenly distributed on the partition, so that the rotor can work stably in the space inside the stator ring, and the heat emitted by the work is discharged through the heat dissipation holes. Preferably, two skeleton oil seals are installed on the mandrel, and the two skeleton oil seals are respectively placed at the front and rear ends of the rotor, and the mandrel is connected to the partition through the skeleton oil seal. In this design, the skeleton oil seal installed on the mandrel can be well connected with the partition, so that the mandrel can rotate stably under the support effect of the partition. Preferably, two mounting blocks are installed on the mandrel, and the two mounting blocks are respectively placed at the front and rear ends of the rotor, and the mounting block is connected to the partition, and a sleeve block is installed on the mounting block, and the sleeve block is detachably connected to the mounting block, and a number of fan blades are symmetrically distributed on the sleeve block, and two rotation grooves are provided on the inner wall of the shell, one end of the fan blade is connected to the sleeve block, and the other end of the fan blade is placed in the rotation groove.This design can make a good connection between the mandrel and the partition through the two mounting blocks installed on the mandrel, and enhance the stability of the mandrel when rotating. The sleeve block installed on the mounting block is equipped with fan blades. Then, when the mandrel rotates, the fan blades on the sleeve block can be driven to fan the air, and the heat, moisture and dust in the cavity are blown outward. One end of the fan blade is connected to the sleeve block, and the other end is placed in the rotating groove on the inner wall of the shell. It not only prevents the fan blade from touching other structures when fanning, but also prevents the fan blade from fluttering back and forth after fanning for a long time, affecting the work of blowing heat, moisture and dust outward. Preferably, a plurality of roller grooves are evenly distributed on the stator ring, and rollers are installed in the roller grooves, and the rotor is in contact with the rollers. In this design, rollers can be installed through several roller grooves evenly distributed on the stator ring, so that the rotor can contact the rollers, so that when the rotor rotates, it can be smoothly carried out under the rotation effect of the roller, avoiding the rotation of the rotor, contact with the stator ring, and frictional heat. This also has the effect of preventing the rotor from being damaged by frictional rotation. Preferably, a convex ring and a waterproof layer are installed on the shell, and the convex ring includes several convex rings, and several convex rings are evenly distributed. The convex ring is mounted on the outer wall of the shell, and the waterproof layer is mounted inside the shell. In this design, several convex rings are mounted on the outer wall of the shell, which not only reduces the probability of the shell being damaged by foreign objects, but also allows the liquid water on the shell and the convex ring to flow down smoothly under the influence of the shape of the shell. The waterproof layer mounted inside the shell has a waterproof effect to prevent external water from penetrating into the cavity. Preferably, a plurality of support rods are installed on the convex ring, and the plurality of support rods are evenly distributed. A hollow cylinder is sleeved on the support rod, and a spring is sleeved outside the hollow cylinder. One end of the support rod and one end of the spring are both connected to the convex ring. A limiting plate is installed at the bottom end of the hollow cylinder, and a plurality of hollow cylinders are symmetrically distributed on the limiting plate. The top end of the hollow cylinder is placed between the convex ring and the limiting plate. A movable disk is installed at the other end of the support rod, and a movable groove is provided at the bottom end of the hollow cylinder. The outer edge of the movable disk is placed in the movable groove. A compression spring is installed on the movable disk, and the bottom end of the hollow cylinder, the compression spring and the other end of the spring are all connected to the limiting plate. In this design, several support rods evenly distributed on the convex ring can be inserted into several hollow tubes on the limit plate. The support rods here correspond to the hollow tubes one by one, and one end of the support rod is connected to the convex ring, and the other end is equipped with a movable disk, and the outer edge of the movable disk is placed in the movable groove at the bottom of the hollow tube. Then, when the stepper motor is working, the initial vibration is to let the shell move toward the limit plate, and one end of the spring mounted outside the hollow tube is connected to the convex ring, and the other end is connected to the limit plate, and the movable disk is also connected to the limit plate through a compression spring, so the up and down vibration of the shell is carried out under the elastic effect of the spring and the compression spring, gradually slowing down the vibration effect.

[0007] The beneficial effects of the present invention are: achieving the purpose of installing a component that can automatically start the moisture or dust blocking operation; having the effect of reducing the vibration of the shell; and installing a component that avoids the rotor from being damaged by friction. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a structural schematic diagram of the present invention;

[0009] Figure 2 is a schematic diagram of the connection of the rotor of the present invention;

[0010] Figure 3 It is a schematic diagram of the distribution of the rollers of the present invention;

[0011] Figure 4 It is a connection schematic diagram of the hollow cylinder of the present invention;

[0012] Figure 5 It is a connection schematic diagram of the support rod of the present invention;

[0013] Figure 6 yes Figure 2 The enlarged cross-sectional view at A in the middle;

[0014] Figure 7 yes Figure 2 The enlarged cross-sectional view at B in the middle;

[0015] Figure 8 It is a schematic diagram of a working state of the flip cover of the present invention.

[0016] In the figure: 1, shell, 2, front cover, 3, rear cover, 4, convex ring, 5, activated carbon filter, 6, rotor, 7, core shaft, 8, stator ring, 9, rolling bearing one, 10, rolling bearing two, 11, fixed ring, 12, partition, 13, skeleton oil seal, 14, mounting block, 15, sleeve block, 16, fan blade, 17, rotating groove, 18, limit plate, 19, support rod, 20, roller groove, 21, roller, 22, hollow cylinder, 23, spring, 24, movable groove, 25, movable disk, 26, compression spring, 27, waterproof layer, 28, vent one, 29, vent two, 30, flip cover groove, 31, rolling shaft, 32, miniature rolling bearing, 33, flip cover. Implementation

[0017] The invention is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0018] like Figure 1 , Figure 2 , Figure 7 and Figure 8In the embodiment shown, a stepper motor with waterproof and dustproof functions includes a shell 1, a front cover 2, a rear cover 3 and a rotor 6 are installed on the shell 1, a cavity is provided in the shell 1, the front cover 2 is placed at the front end of the shell 1, a vent hole 28 and a flip cover groove 30 are provided on the front cover 2, the vent hole 28 and the flip cover groove 30 each include a plurality of vent holes 28 and flip cover grooves 30, and the flip cover grooves 30 correspond to the vent holes 28 one by one. A flip cover 33 is installed in the flip cover groove 30, and the flip cover 33 is detachably connected to the front cover 2, and the position of the flip cover 33 corresponds to the position of the vent hole 28 front to back. The rear cover 3 is placed at the rear end of the shell 1, and the rotor 6 is placed in the cavity. A core shaft 7 is installed on the rotor 6, and the rear end of the core shaft 7 is detachably connected to the rear cover 3, and the front end of the core shaft 7 passes through the front cover 2 and is placed outside the shell 1, and the core shaft 7 is detachably connected to the front cover 2. The rear end of the vent hole 28 is connected to the cavity, and the flip cover groove 30 is placed at the front end of the vent hole 28. A miniature rolling bearing 32 is installed in the flip cover groove 30. A rolling shaft 31 is installed on the inner ring of the miniature rolling bearing 32. The miniature rolling bearing 32 is connected to the front cover 2 through the rolling shaft 31, and the flip cover 33 is connected to the outer ring of the miniature rolling bearing 32.

[0019] like Figure 2 As shown, a rolling bearing 9 and a fixing ring 11 are installed on the front cover 2, and the front end of the core shaft 7 passes through the rolling bearing 9 and the fixing ring 11 in sequence and is placed outside the housing 1. A rolling bearing 10 is installed on the rear cover 3, and the rear end of the core shaft 7 is connected to the rolling bearing 10. There are a number of vent holes 29 evenly distributed on the rear cover 3, and the rolling bearing 10 is placed at the front end of the rear cover 3. An activated carbon filter 5 is installed at the rear end of the rear cover 3. A stator ring 8 and two partitions 12 are installed in the cavity. The stator ring 8 is sleeved on the inner wall of the housing 1, and the rotor 6 is sleeved in the stator ring 8. The two partitions 12 are respectively placed at the front and rear ends of the stator ring 8, and the front and rear ends of the rotor 6 are respectively connected to the two partitions 12. There are a number of heat dissipation holes evenly distributed on the partition 12. Two skeleton oil seals 13 are installed on the core shaft 7, and the two skeleton oil seals 13 are respectively placed at the front and rear ends of the rotor 6. The core shaft 7 is connected to the partition 12 through the skeleton oil seal 13. Two mounting blocks 14 are installed on the core shaft 7, and the two mounting blocks 14 are respectively placed at the front and rear ends of the rotor 6. The mounting block 14 is connected to the partition 12. A sleeve block 15 is installed on the mounting block 14. The sleeve block 15 is detachably connected to the mounting block 14. A plurality of fan blades 16 are symmetrically distributed on the sleeve block 15. Two rotating grooves 17 are provided on the inner wall of the shell 1. One end of the fan blade 16 is connected to the sleeve block 15, and the other end of the fan blade 16 is placed in the rotating groove 17.

[0020] like Figure 3 As shown, a plurality of roller grooves 20 are evenly distributed on the stator ring 8 , rollers 21 are installed in the roller grooves 20 , and the rotor 6 is in contact with the rollers 21 .

[0021] like Figure 1 , Figure 2 , Figure 4 , Figure 5 and Figure 6 As shown, a convex ring 4 and a waterproof layer 27 are installed on the shell 1. The convex ring 4 includes a plurality of convex rings 4, which are evenly distributed. The convex ring 4 is sleeved on the outer wall of the shell 1, and the waterproof layer 27 is sleeved inside the shell 1. A plurality of support rods 19 are installed on the convex ring 4, and the plurality of support rods 19 are evenly distributed. A hollow cylinder 22 is sleeved on the support rod 19, and a spring 23 is sleeved outside the hollow cylinder 22. One end of the support rod 19 and one end of the spring 23 are both connected to the convex ring 4. A limiting plate 18 is installed at the bottom end of the hollow cylinder 22. A plurality of hollow cylinders 22 are symmetrically distributed on the limiting plate 18. The top of the hollow cylinder 22 is placed between the convex ring 4 and the limiting plate 18. A moving disk 25 is installed at the other end of the support rod 19. A moving groove 24 is provided at the bottom end of the hollow cylinder 22. The outer edge of the moving disk 25 is placed in the moving groove 24. A compression spring 26 is installed on the moving disk 25. The bottom end of the hollow cylinder 22, the compression spring 26 and the other end of the spring 23 are all connected to the limiting plate 18.

[0022] First, start the stepper motor, and let the rotor 6 in the cavity of the shell 1 start the rotation of the core shaft 7. The stepper motor works by rotating a fixed angle in the set direction after receiving the pulse signal. Its rotation is run step by step at a fixed angle. This means that after the rotor 6 receives the pulse signal, the core shaft 7 rotates a fixed angle in the set direction, or the angular displacement is controlled by controlling the number of pulses, so as to achieve the purpose of accurate positioning. The rotor 6 installed in the cavity is mounted on the stator ring 8, and the stator ring 8 is mounted on the inner wall of the shell 1, so the rotor 6 works smoothly under the limit in the shell 1. In addition, there are several roller grooves 20 evenly distributed on the stator ring 8, and the rotor 6 is in contact with the roller 21 installed in the roller groove 20. In this way, the rotation of the rotor 6 is carried out under the rolling effect of the roller 21, which avoids the wear of the rotor 6 due to the friction of the stator ring 8. In addition, the front end of the mandrel 7 mounted on the rotor 6 passes through the front cover 2 and the fixing ring 11 in sequence and is placed outside the housing 1. The rolling bearing 9 installed on the front cover 2 allows the mandrel 7 to rotate smoothly under the support of the front cover 2, and the fixing ring 11 increases the support length of the mandrel 7, making the rotation of the mandrel 7 more stable. The rear end of the mandrel 7 is connected to the rolling bearing 10 on the rear cover 3, which means that the rear end of the mandrel 7 rotates smoothly under the support of the rear cover 3, and the front and rear ends of the mandrel 7 rotate under the support effect, and the rotation is more stable. The two partitions 12 in the cavity are respectively placed at the front and rear ends of the stator ring 8, and the mandrel 7 is connected to the partition 12 through the skeleton oil seal 13, so that the rotation of the mandrel 7 is also supported by the partition 12, and the stability effect is better. During the rotation of the core shaft 7, the sleeve block 15 installed on the core shaft 7 can drive the fan blades 16 to fan, and the heat generated by the rotor 6 during operation, as well as the moisture and dust in the cavity, are driven by the wind to float toward the front cover 2 and the rear cover 3. Of course, the heat generated by the rotor 6 during operation needs to be discharged through the heat dissipation holes on the partition 12, and then the airflow floating toward the front cover 2 can be discharged through a plurality of vents 1 28, and the airflow floating toward the rear cover 3 is discharged through a plurality of vents 2 29. Here, one end of the fan blade 16 is connected to the sleeve block 15, and the other end is placed in the rotating groove 17 on the inner wall of the housing 1, so as to prevent the fan blade 16 from deviating forward and backward after a long period of transmission, thereby affecting the fanning effect.Here, the flap groove 30 on the front cover 2 is placed at the front end of the vent hole 28, and the rear end of the vent hole 28 is connected to the cavity. In addition, a micro rolling bearing 32 is installed in the flap groove 30. The micro rolling bearing 32 is connected to the front cover 2 through the rolling shaft 31 connected to the inner ring, and the outer ring of the micro rolling bearing 32 is connected to the flap 33. Then, the airflow discharged from the inside and outside of the cavity can push the flap 33 to turn outward, allowing the airflow to drive heat, moisture, and dust to float outward. After the external discharge is completed, the flap 33 is supported by the micro rolling bearing 32 and flips toward the flap groove 30, closing the vent hole 28, achieving the purpose of installing a component that can automatically open the moisture or dust blocking work. The activated carbon filter 5 is also installed on the back cover 3, which also has the effect of adsorbing and filtering the moisture and dust from the outside, and prevents the moisture and dust from entering the cavity through the back cover 3. Several convex rings 4 are also mounted on the outer wall of the housing 1, which not only reduces the probability of damage caused by foreign objects touching the housing 1, but also allows external liquid water to flow downward under the guidance of the housing 1. A waterproof layer 27 is also mounted inside the housing 1 to prevent external water from penetrating into the cavity and affecting the operation of the stepper motor. At the bottom of the housing 1, a limit plate 18 is placed, and the end of the support rod 19 mounted on the convex ring 4 is inserted into the hollow cylinder 22 mounted on the limit plate 18. In addition, the outer edge of the moving disk 25 mounted on the end of the support rod 19 in the hollow cylinder 22 is placed in the moving groove 24 and connected to the limit plate 18 through a compression spring 26. The spring 23 mounted outside the hollow cylinder 22 is also connected to the convex ring 4 at one end and to the limit plate 18 at the other end. Then, the shaking generated when the stepper motor is working can be carried out under the elastic effect of the spring 23 and the compression spring 26, so that the vibration effect can be gradually slowed down. The partition 12 and the waterproof layer 27 here can be made of copper plates with good thermal conductivity, which not only have good thermal conductivity and are convenient for heat dissipation, but are also strong and durable.

Claims

1. A stepper motor with waterproof and dustproof function, characterized in that: The invention comprises a shell (1), wherein a front cover (2), a rear cover (3) and a rotor (6) are mounted on the shell (1), wherein a cavity is arranged inside the shell (1), wherein the front cover (2) is arranged at the front end of the shell (1), wherein a vent hole (28) and a flap groove (30) are arranged on the front cover (2), wherein the vent hole (28) and the flap groove (30) each comprise a plurality of vent holes (28) and a plurality of flap grooves (30), wherein the flap grooves (30) correspond one to one with the vent holes (28), wherein a flap (33) is mounted inside the flap groove (30), wherein the flap (33) is detachably connected to the front cover (2), wherein the position of the flap (33) corresponds front to back with the position of the vent hole (28), wherein the flap (33) is disposed in a manner similar to that of the vent hole (28). The rear cover (3) is placed at the rear end of the housing (1), the rotor (6) is placed in the cavity, a core shaft (7) is mounted on the rotor (6), the rear end of the core shaft (7) is detachably connected to the rear cover (3), the front end of the core shaft (7) passes through the front cover (2) and is placed outside the housing (1), the core shaft (7) is detachably connected to the front cover (2), the rear end of the vent hole (28) is connected to the cavity, the flip cover groove (30) is placed at the front end of the vent hole (28), a miniature rolling bearing (32) is mounted in the flip cover groove (30), a rolling shaft (31) is mounted on the inner ring of the miniature rolling bearing (32), and the miniature rolling bearing (32) is provided with a plurality of rollers. 2) is connected to the front cover (2) through a rolling shaft (31), the flip cover (33) is connected to the outer ring of a miniature rolling bearing (32), a rolling bearing (9) and a fixing ring (11) are installed on the front cover (2), the front end of the core shaft (7) passes through the rolling bearing (9) and the fixing ring (11) in sequence and is placed outside the housing (1), a rolling bearing (10) is installed on the rear cover (3), the rear end of the core shaft (7) is connected to the rolling bearing (10), a plurality of vent holes (29) are evenly distributed on the rear cover (3), the rolling bearing (10) is placed at the front end of the rear cover (3), and a movable A carbon filter (5) is provided, wherein a stator ring (8) and two partitions (12) are installed in the cavity, wherein the stator ring (8) is sleeved on the inner wall of the housing (1), wherein the rotor (6) is sleeved in the stator ring (8), wherein the two partitions (12) are respectively arranged at the front and rear ends of the stator ring (8), wherein the front and rear ends of the rotor (6) are respectively connected to the two partitions (12), wherein a plurality of heat dissipation holes are evenly distributed on the partitions (12), wherein two skeleton oil seals (13) are installed on the core shaft (7), wherein the two skeleton oil seals (13) are respectively arranged at the front and rear ends of the rotor (6), and wherein the core shaft (7) is connected to the partitions (12) via the skeleton oil seals (13).

2. The stepping motor with waterproof and dustproof function according to claim 1 is characterized in that: Two mounting blocks (14) are mounted on the spindle (7), the two mounting blocks (14) are respectively placed at the front and rear ends of the rotor (6), the mounting blocks (14) are connected to the partition plate (12), a sleeve block (15) is mounted on the mounting block (14), the sleeve block (15) is detachably connected to the mounting block (14), a plurality of fan blades (16) are symmetrically distributed on the sleeve block (15), two rotation grooves (17) are provided on the inner wall of the housing (1), one end of the fan blade (16) is connected to the sleeve block (15), and the other end of the fan blade (16) is placed in the rotation groove (17).

3. The stepping motor with waterproof and dustproof function according to claim 1 is characterized in that: A plurality of roller grooves (20) are evenly distributed on the stator ring (8), rollers (21) are installed in the roller grooves (20), and the rotor (6) is in contact with the rollers (21).

4. The stepping motor with waterproof and dustproof function according to claim 1 is characterized in that: The housing (1) is provided with a convex ring (4) and a waterproof layer (27), wherein the convex ring (4) comprises a plurality of convex rings (4) which are evenly distributed, the convex ring (4) is sleeved on the outer wall of the housing (1), and the waterproof layer (27) is sleeved inside the housing (1).

5. The stepping motor with waterproof and dustproof function according to claim 4 is characterized in that: A plurality of support rods (19) are mounted on the convex ring (4), the plurality of support rods (19) are evenly distributed, a hollow tube (22) is sleeved on the support rod (19), a spring (23) is sleeved outside the hollow tube (22), one end of the support rod (19) and one end of the spring (23) are both connected to the convex ring (4), a limiting plate (18) is mounted on the bottom end of the hollow tube (22), the plurality of hollow tubes (22) are symmetrically distributed on the limiting plate (18), and the hollow tube ( The top end of the hollow cylinder (22) is placed between the convex ring (4) and the limit plate (18), the other end of the support rod (19) is installed with a movable disk (25), the bottom end of the hollow cylinder (22) is provided with a movable groove (24), the outer edge of the movable disk (25) is placed in the movable groove (24), the movable disk (25) is installed with a compression spring (26), and the bottom end of the hollow cylinder (22), the compression spring (26) and the other end of the spring (23) are all connected to the limit plate (18).

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