A stepper motor structure with a waterproof mechanism

Abstract

This invention discloses a stepper motor structure with a waterproof mechanism, relating to the field of stepper motor technology. It includes a stepper motor body, with a waterproof device installed at the junction of the stepper motor body and the rear end cover. The waterproof device includes a first protective plate, a base plate, and a filling mechanism. The first protective plate is symmetrically attached to the outer wall of the rear end cover of the stepper motor body, and the base plate is attached to the bottom of the first protective plate. This invention uses the attachment of the first protective plate and the base plate as the basic waterproof structure, combined with the interference fit between the movable block and the second protective plate, to construct a multi-dimensional, seamless waterproof protection system. This completely blocks the path of moisture intrusion from key gaps, achieving seamless sealing of gaps around the cable, significantly improving the waterproof reliability of the stepper motor body. It is suitable for harsh working conditions such as humidity and dust, and can be installed without disassembling the cable, making operation convenient and without damaging the cable.

Description

Technical Field

[0001] This invention relates to the field of stepper motor technology, and more particularly to a stepper motor structure with a waterproof mechanism. Background Technology

[0002] A stepper motor is an electromagnetic actuator that converts electrical pulse signals into angular or linear displacement. With its advantages of high control precision, fast response speed, and stable operation, it is widely used in various scenarios such as automation equipment, environmental protection machinery, and outdoor instruments. Its reliability directly determines the operating effect of the entire equipment.

[0003] The junction between the stepper motor body and the rear cover, and the connection between the cable and the protective structure are natural weak points in sealing. Traditional structures lack targeted sealing designs, and moisture can easily seep into the motor through these gaps, causing coil short circuits, bearing corrosion, failure of electrical components such as magnetic encoders, directly affecting the stability of motor operation or even scrapping it.

[0004] In addition, stepper motors are often used in harsh working conditions such as humid and dusty environments (e.g., environmental protection equipment, outdoor machinery), and have a rigid requirement for waterproof protection. When the motor is running, the entire body vibrates slightly, which can cause slight displacement of the cable. High-frequency vibration can easily cause the sealing structure to fall off or fail. Therefore, how to provide a stepper motor structure with a waterproof mechanism is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] One objective of this invention is to propose a stepper motor structure with a waterproof mechanism, thereby solving the technical problem in related technologies that moisture can easily enter the motor from the junction of the body and the rear cover, and the connection between the cable and the protective structure.

[0006] The present invention provides a stepper motor structure with a waterproof mechanism, including a stepper motor body, a waterproof device provided at the junction of the stepper motor body and the rear end cover, the waterproof device including a first protective plate, a base plate and a filling mechanism, the first protective plate being symmetrically attached to the outer side wall of the rear end cover of the stepper motor body, the base plate being attached to the bottom of the first protective plate, and the junction of the first protective plate and the base plate being filled with waterproof adhesive. The filling mechanism includes a second protective plate and a movable block. The second protective plate is sleeved on the outer wall of the stepper motor main cable. The movable block is located on top of the second protective plate, and the inner side of the movable block is in contact with the outer wall of the stepper motor main cable. A filling block is snapped onto the outer wall of the movable block. A gap is left between the second protective plate and the stepper motor main cable, and the length of the gap covers half of the circumference of the cable. During installation, the movable block is inserted into the gap between the second protective plate and the stepper motor main cable, and an interference fit is formed between the filling block and the second protective plate.

[0007] In a preferred embodiment, the second protective plate has an internal receiving groove, the stepper motor main cable is located inside the receiving groove, and a protrusion is provided on the side of the receiving groove near the outer wall of the stepper motor main body. The protrusion fits against the outer wall of the stepper motor main cable, and the protrusion and the movable block are spliced ​​together to form a complete ring structure.

[0008] In a preferred embodiment, a limiting frame is fitted onto the outer wall of the movable block. The limiting frame is located at the outer edge of the filling block, and the filling block is in a compressed state when the limiting frame contacts the filling block. A top plate is provided on the top of the movable block, and the limiting frame is located below the top plate. During installation, the lower surface of the limiting frame is attached to the top of the second protective plate.

[0009] In a preferred embodiment, a boss is provided on the upper surface of the substrate, the bottom of the first protective plate overlaps the upper surface of the boss, a stepped bonding surface is formed between the edge of the boss and the upper surface of the substrate, and the inner sidewall of the second protective plate is bonded to the stepped bonding surface.

[0010] In a preferred embodiment, one end face of the two first protective plates is connected by a rod structure. A positioning hole is provided on the end face of one of the first protective plates, and a rod is provided on the end face of the other first protective plate 21. The shape of the rod is adapted to the positioning hole. A cavity is provided on the inner side of the other end face between the two first protective plates.

[0011] In a preferred embodiment, locking mechanisms are symmetrically arranged at the edge of the substrate. The locking mechanisms are used to lock the first protective plate and the filling mechanism. The locking mechanisms include a locking mechanism integrally formed at the edge of the substrate. A guide rod is fixedly connected to the upper surface of the locking mechanism. The guide rod is located at the outer edge of the first protective plate.

[0012] In a preferred embodiment, a first pressure plate is sleeved on the outer wall of the guide rod. The first pressure plate is perpendicular to the guide rod, and the lower surface of the first pressure plate overlaps the top of the first protective plate. The lower surface of the first pressure plate has a groove whose shape matches the corner shape of the first protective plate.

[0013] In a preferred embodiment, a lead screw is rotatably mounted on the upper surface of the extension plate, and a second pressure plate is threaded onto the outer wall of the lead screw. During installation, the lower surface of the second pressure plate is fixedly connected to the upper surface of the second protective plate, and a semi-circular groove is provided at one end of the second pressure plate facing the limiting frame.

[0014] In a preferred embodiment, an anti-detachment baffle is fixedly connected to the top of the guide rod, and one side of the anti-detachment baffle is in contact with the outer side of the second protective plate. The lead screw passes through the anti-detachment baffle and is threadedly connected to the first pressure plate.

[0015] In a preferred embodiment, a hexagonal rod is fixedly connected to the end of the lead screw by bolts. The second pressure plate is located above the anti-detachment baffle, and the first pressure plate is located below the anti-detachment baffle. When the lead screw is rotated, the first pressure plate and the second pressure plate move synchronously.

[0016] The beneficial effects of this invention are: 1. This invention is based on the bonding of the first protective plate and the substrate as a waterproof structure. Combined with the interference fit between the movable block and the second protective plate, it constructs a multi-dimensional, dead-angle-free waterproof protection system, completely blocking the path of water vapor intrusion from key gaps, achieving seamless sealing of the gaps around the cable, greatly improving the waterproof reliability of the stepper motor body, adapting to harsh working conditions such as humidity and dust, and can be installed without disassembling the cable, making the operation convenient and without damaging the cable.

[0017] 2. This invention ensures that each component is installed accurately and fits tightly through the assembly logic of positioning before locking. At the same time, components such as the limiting frame and anti-detachment baffle enhance structural stability and prevent sealing failure caused by long-term use or slight vibration. Without affecting the original performance of the motor, it extends the service life of the stepper motor body and reduces maintenance costs and downtime risks caused by water leakage failure. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a three-dimensional structural diagram of one side of a stepper motor structure with a waterproof mechanism proposed in this invention; Figure 2 This is a three-dimensional structural diagram of the other side of a stepper motor structure with a waterproof mechanism proposed in this invention.

[0019] Figure 3 This is a schematic diagram of the planar structure of the locking mechanism of a stepper motor structure with a waterproof mechanism proposed in this invention.

[0020] Figure 4 This is a schematic diagram of the internal structure of the first protective plate of a stepper motor structure with a waterproof mechanism proposed in this invention.

[0021] Figure 5 For the present invention Figure 4 Enlarged structural diagram of part A.

[0022] Figure 6 This is a schematic diagram of the planar structure of the filling mechanism of a stepper motor structure with a waterproof mechanism proposed in this invention.

[0023] Figure 7This is a top view of a waterproof device with a waterproof mechanism for a stepper motor structure proposed in this invention.

[0024] In the diagram: 1. Stepper motor body; 2. Waterproof device; 21. First protective plate; 22. Base plate; 23. Locking mechanism; 231. Extension plate; 232. Lead screw; 233. Guide rod; 234. First pressure plate; 235. Second pressure plate; 236. Anti-detachment baffle; 24. Positioning hole; 25. Filling mechanism; 251. Second protective plate; 252. Movable block; 253. Limiting frame; 254. Top plate; 255. Filling block; 256. Receiving groove; 257. Protrusion; 26. Cavity; 27. Boss. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0026] Example 1 like Figure 1 , Figure 2 and Figure 5 As shown, the device includes a stepper motor body 1. A waterproof device 2 is installed at the junction of the stepper motor body 1 and the rear cover. The stepper motor body 1 includes standard components such as the body, rear cover, output shaft, internal stator, bearings, and cables, enabling precise conversion of electrical pulse signals into angular or linear displacement. The junction between the body and the rear cover is a natural weak point in sealing and is one of the core protection parts of the waterproof device 2 of this application. The cable extending from the stepper motor body 1 is the power supply and signal transmission component of the motor. It is led out from the junction of the body and the rear cover and is another core weak point in sealing. The coils, bearings, and electrical sensing components inside the stepper motor body 1 are highly sensitive to moisture. Once moisture seeps in from the junction of the body and the rear cover and the cable connection, it can easily cause short circuits in the coils, corrosion of the bearings, and failure of electrical components. All components of the waterproof device 2 of this invention are specifically installed around the aforementioned weak points of the stepper motor body 1.

[0027] The waterproof device 2 includes a first protective plate 21, a substrate 22 and a filling mechanism 25. The first protective plate 21 is symmetrically attached to the outer side wall of the rear end cover of the stepper motor body 1. The substrate 22 is attached to the bottom of the first protective plate 21. The junction of the first protective plate 21 and the substrate 22 is filled with waterproof adhesive. The filling mechanism 25 includes a second protective plate 251 and a movable block 252. The second protective plate 251 is sleeved on the outer wall of the cable of the stepper motor body 1. The movable block 252 is located on the top of the second protective plate 251, and the inner side of the movable block 252 is in contact with the outer wall of the cable of the stepper motor body 1. A filling block 255 is snapped onto the outer wall of the movable block 252. A gap is left between the second protective plate 251 and the cable of the stepper motor body 1. The length of the gap covers half of the circumference of the cable. During installation, the movable block 252 is inserted into the gap between the second protective plate 251 and the cable of the stepper motor body 1. An interference fit is formed between the filling block 255 and the second protective plate 251.

[0028] It should be noted that when the stepper motor body 1 is working, the junction between its body and the rear end cover is sealed and waterproofed by the waterproof device 2. The first protective plate 21 of the waterproof device 2 is symmetrically attached to the outer wall of the rear end cover of the stepper motor body 1, and the substrate 22 is attached to the bottom of the first protective plate 21. The waterproof adhesive filled at the junction of the first protective plate 21 and the substrate 22 can block the water seepage path at this part. At the same time, the filling mechanism 25 is sleeved on the outer wall of the cable of the stepper motor body 1 through the second protective plate 251. Utilizing the gap reserved between the second protective plate 251 and the cable of the stepper motor body 1, which covers one-third of the cable, the movable block 252, whose inner side is attached to the outer wall of the cable of the stepper motor body 1, is inserted into this gap during installation, so that the filling mechanism 252 is engaged on the outer wall of the movable block 252. Block 255 and the second protective plate 251 form an interference fit, thereby achieving a tight seal between the cable and the second protective plate 251. Through the first protective plate 21, the base plate 22 and the waterproof adhesive at their junction, the junction between the stepper motor body 1 and the rear cover is effectively sealed, preventing moisture from seeping in from the gap. At the same time, the second protective plate 251, the movable block 252 and the filling block 255 of the filling mechanism 25 cooperate with each other. With the help of the interference fit structure design, they tightly fit the cable of the stepper motor body 1, completely sealing the gap between the cable and the protective structure, preventing moisture from entering from the cable connection. The synergistic effect of each component forms a multi-directional, high-strength waterproof protection, significantly improving the waterproof performance of the stepper motor body 1, ensuring its stable operation in humid environments, and extending its service life.

[0029] It should also be noted that during installation, the substrate 22 is first attached to the preset installation position as the basic installation reference. Then, two first protective plates 21 are taken and symmetrically attached to the outer wall of the rear end cover of the stepper motor body 1, so that the bottom of the first protective plate 21 is completely attached to the upper surface of the substrate 22. Waterproof glue is filled at the junction of the two. Next, the second protective plate 251 is sleeved on the outer wall of the cable of the stepper motor body 1. At this time, the second protective plate 251 is attached to the first protective plate 21. Then, the filler block 255 is snapped onto the outer wall of the movable block 252. After the movable block 252 is attached to the outer wall of the cable of the stepper motor body 1, the movable block 252 is aligned with the gap between the second protective plate 251 and the cable and inserted, so that the filler block 255 and the second protective plate 251 form an interference fit, and the assembly is completed.

[0030] Example 2 like Figure 4 , Figure 5 and Figure 6 As shown, the second protection plate 251 has an internal receiving groove 256. The cable of the stepper motor body 1 is located inside the receiving groove 256. A protrusion 257 is provided on the side of the receiving groove 256 near the outer wall of the stepper motor body 1. The protrusion 257 fits against the outer wall of the cable of the stepper motor body 1. The protrusion 257 and the movable block 252 are spliced ​​together to form a complete ring structure.

[0031] It should be noted that the second protection plate 251 forms a wrap-around positioning of the cable of the stepper motor body 1 through the internal receiving groove 256. The protrusion 257 on the side of the receiving groove 256 near the outer wall of the stepper motor body 1 first fits tightly against the outer wall of the cable, and then the movable block 252 splices with the protrusion 257 to form a complete ring structure, thereby achieving a closed-loop wrap around the entire circumference of the cable. This prevents the cable from making slight displacement while blocking moisture from seeping in from the gap between the cable and the second protection plate 251.

[0032] It should also be noted that, such as Figure 5 and Figure 6As shown, a limiting frame 253 is fitted onto the outer wall of the movable block 252. The limiting frame 253 is located at the outer edge of the filling block 255, and when the limiting frame 253 contacts the filling block 255, the filling block 255 is in a compressed state. A top plate 254 is provided on the top of the movable block 252, and the limiting frame 253 is located below the top plate 254. When installing the movable block 252, the limiting frame 253 is first fitted onto the movable block 252, and the filling block 255 is compressed by the limiting frame 253. Then the limiting frame 253 is... The lower surface of 253 is attached to the top of the second protective plate 251, and then the movable block 252 is pressed down. After the movable block 252 drives the filling block 255 into the receiving groove 256, it loses the compression of the limiting frame 253 and begins to restore its shape. Finally, it contacts the receiving groove 256 and forms an interference fit. The limiting frame 253 contacts the top plate 254 to ensure the stability of the movable block 252 and strengthen the fit and sealing between the movable block 252 and the second protective plate 251 and the cable, blocking the water seepage path.

[0033] Example 3 like Figure 4 As shown, a boss 27 is provided on the upper surface of the substrate 22. The bottom of the first protective plate 21 overlaps the upper surface of the boss 27. A stepped bonding surface is formed between the edge of the boss 27 and the upper surface of the substrate 22. The inner sidewall of the second protective plate 251 is bonded to the stepped bonding surface.

[0034] It should be noted that the first protective plate 21 overlaps the boss 27 to achieve initial installation and positioning. The edge of the boss 27 and the upper surface of the substrate 22 form a stepped bonding surface. The inner sidewall of the second protective plate 251 is tightly bonded to this stepped bonding surface. The installation position of the second protective plate 251 is fixed by the limiting effect of the stepped structure. At the same time, the tight contact of the bonding surface prevents moisture from seeping in from the connection between the substrate 22 and the second protective plate 251.

[0035] It should also be noted that, such as Figure 4 As shown, one end face of the two first protection plates 21 is connected by a plug structure. A positioning hole 24 is provided on the end face of one first protection plate 21, and a plug is provided on the end face of the other first protection plate 21. The shape of the plug is adapted to the positioning hole 24. A cavity 26 is provided on the inner side of the other end face between the two first protection plates 21. The positioning hole 24 on the end face of one first protection plate 21 cooperates with the plug with the adapted shape on the end face of the other substrate 22, so that the two first protection plates 21 are precisely aligned and symmetrically attached to the outer wall of the rear end cover of the stepper motor body 1. At the same time, the cavity 26 provides space for assembly, avoids damage to the cable during connection, ensures tight fit between the first protection plate 21 and the substrate 22 and the rear end cover, and prevents moisture from seeping in from the splice of the first protection plate 21 and the gap between it and the rear end cover.

[0036] Example 4 like Figure 1 and Figure 3 As shown, a locking mechanism 23 is symmetrically arranged at the edge of the substrate 22. The locking mechanism 23 is used to lock the first protective plate 21 and the filling mechanism 25. The locking mechanism 23 includes an extension plate 231 integrally formed at the edge of the substrate 22. A guide rod 233 is fixedly connected to the upper surface of the extension plate 231. The guide rod 233 is located at the outer edge of the first protective plate 21.

[0037] It should be noted that the integral molding of the extension plate 231 and the base plate 22 can ensure the structural stability of the locking mechanism 23. The guide rod 233 is located on the outer edge of the first protective plate 21, which can provide an installation reference for the subsequent pressing components and protect the first protective plate 21, so as to avoid the first protective plate 21 from colliding with external objects. At the same time, the locking mechanism 23, through the overall locking action, makes the first protective plate 21 fit tightly against the rear end cover of the stepper motor body 1 and the base plate 22.

[0038] It should also be noted that a first pressure plate 234 is sleeved on the outer wall of the guide rod 233. The first pressure plate 234 is perpendicular to the guide rod 233, and the lower surface of the first pressure plate 234 overlaps the top of the first protective plate 21. The lower surface of the first pressure plate 234 has a groove whose shape matches the corner shape of the first protective plate 21. The first pressure plate 234 sleeved on the outer wall of the guide rod 233 is perpendicular to the guide rod 233. The groove on its lower surface matches the corner shape of the first protective plate 21. During installation, the first pressure plate 234 is engaged at the corner of the first protective plate 21 through the groove, and the lower surface overlaps the top of the first protective plate 21. Under the positioning action of the guide rod 233, the first pressure plate 234 applies longitudinal pressing force to the first protective plate 21, so that the first protective plate 21 is always tightly attached to the rear end cover of the stepper motor body 1 and the base plate 22, blocking the water seepage path at the connection.

[0039] A lead screw 232 is rotatably mounted on the upper surface of the extension plate 231. A second pressure plate 235 is threaded onto the outer wall of the lead screw 232. During installation, the lower surface of the second pressure plate 235 is fixedly connected to the upper surface of the second protective plate 251. A semi-circular groove is provided at one end of the second pressure plate 235 facing the limiting frame 253. The lead screw 232 rotatably mounted on the upper surface of the extension plate 231 and the second pressure plate 235 threaded onto the outer wall form a pressing structure. During installation, the lower surface of the second pressure plate 235 is fixedly connected to the upper surface of the second protective plate 251. The semi-circular groove at one end of the second pressure plate 235 facing the limiting frame 253 will not affect the normal installation of the movable block 252. By rotating the lead screw 232, the second pressure plate 235 is driven to move longitudinally, applying a stable pressing force to the second protective plate 251, so that the second protective plate 251 is tightly attached to the stepped bonding surface of the side of the first protective plate 21 and the base plate 22.

[0040] like Figure 3 and Figure 7 As shown, an anti-detachment baffle 236 is fixedly connected to the top of the guide rod 233. The anti-detachment baffle 236 is located below the second pressure plate 235, and one side of the anti-detachment baffle 236 is in contact with the outer side of the second protective plate 251. The lead screw 232 passes through the anti-detachment baffle 236 and is threadedly connected to the first pressure plate 234. The anti-detachment baffle 236 fixed to the top of the guide rod 233 is located entirely outside the second pressure plate 235 and is in contact with the second protective plate 251 to achieve lateral limiting, while limiting the longitudinal displacement of the first pressure plate 234 and the second pressure plate 235 to prevent detachment. When the lead screw 232 is rotated, the first pressure plate 234 can be driven to press the first protective plate 21.

[0041] It should also be noted that a hexagonal rod is fixedly connected to the end of the lead screw 232 by bolts. The second pressure plate 235 is located above the anti-detachment baffle 236, and the first pressure plate 234 is located below the anti-detachment baffle 236. When the lead screw 232 is rotated, the first pressure plate 234 and the second pressure plate 235 move synchronously. During installation, the first pressure plate 234 is attached to the top of the first protective plate 21, and the second pressure plate 235 and the second protective plate 251 are attached to the top and side of the first protective plate 21. When the lead screw 232 drives the first pressure plate 234 and the second pressure plate 235, the first protective plate 21 can be pressed and locked in all directions.

[0042] Working principle of the invention: First, attach the substrate 22 to the end face of the stepper motor body 1. Take two first protection plates 21 and connect them with the insertion rod on the end face of the other first protection plate 21 through the positioning hole 24 on the end face of one first protection plate 21. symmetrically attach them to the outer wall of the rear end cover of the stepper motor body 1, so that the bottom of the first protection plate 21 overlaps the protrusion 27 on the upper surface of the substrate 22. Fill the junction of the first protection plate 21 and the substrate 22 with waterproof glue. The second protection plate 251 is sleeved on the outer wall of the cable of the stepper motor body 1, so that the cable is located inside the receiving groove 256 inside the second protection plate 251. The protrusion 257 in the receiving groove 256 is attached to the outer wall of the cable, and at the same time, the inner wall of the second protection plate 251 is attached to the stepped bonding surface formed by the protrusion 27 and the substrate 22. A filling block 255 is snapped onto the outer wall of the movable block 252. The limiting frame 253 is fitted onto the movable block 252 and the filling block 255 is squeezed. After the movable block 252 is controlled to fit against the outer wall of the cable, it is inserted into the gap between the second protection plate 251 and the cable, so that the protrusion 257 and the movable block 252 are spliced ​​to form a complete ring structure. The movable block 252 is pressed down to drive the filling block 255 into the receiving groove 256, so that the lower surface of the limiting frame 253 fits against the top of the second protection plate 251 and contacts the top plate 254. Rotate the lead screw 232 on the extension plate 231 to drive the first pressure plate 234 and the second pressure plate 235 to move longitudinally downward, locking the first protection plate 21, and at the same time locking the second protection plate 251 to the top of the first protection plate 21, thus completing the overall assembly.

[0043] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A stepper motor structure with a waterproof mechanism, comprising a stepper motor body (1), characterized in that, A waterproof device (2) is provided at the junction of the body of the stepper motor (1) and the rear end cover. The waterproof device (2) includes a first protective plate (21), a base plate (22) and a filling mechanism (25). The first protective plate (21) is symmetrically attached to the outer side wall of the rear end cover of the stepper motor body (1). The base plate (22) is attached to the bottom of the first protective plate (21). The junction of the first protective plate (21) and the base plate (22) is filled with waterproof glue. The filling mechanism (25) includes a second protective plate (251) and a movable block (252). The second protective plate (251) is sleeved on the outer wall of the cable of the stepper motor body (1). The movable block (252) is set on the top of the second protective plate (251), and the inner side of the movable block (252) is in contact with the outer wall of the cable of the stepper motor body (1). A filling block (255) is snapped on the outer wall of the movable block (252). There is a gap between the second protective plate (251) and the cable of the stepper motor body (1). The length of the gap covers half of the circumference of the cable. During installation, the movable block (252) is inserted into the gap between the second protective plate (251) and the cable of the stepper motor body (1). An interference fit is formed between the filling block (255) and the second protective plate (251).

2. The stepper motor structure with a waterproof mechanism according to claim 1, characterized in that, The second protective plate (251) has an internal receiving groove (256). The cable of the stepper motor body (1) is located inside the receiving groove (256). A protrusion (257) is provided on the side of the receiving groove (256) near the outer wall of the stepper motor body (1). The protrusion (257) fits against the outer wall of the cable of the stepper motor body (1). The protrusion (257) and the movable block (252) are spliced ​​to form a complete ring structure.

3. The stepper motor structure with a waterproof mechanism according to claim 1, characterized in that, A limiting frame (253) is fitted onto the outer wall of the movable block (252). The limiting frame (253) is located at the outer edge of the filling block (255). When the limiting frame (253) contacts the filling block (255), the filling block (255) is in a compressed state. A top plate (254) is provided on the top of the movable block (252). The limiting frame (253) is located below the top plate (254). During installation, the lower surface of the limiting frame (253) is attached to the top of the second protective plate (251).

4. The stepper motor structure with a waterproof mechanism according to claim 1, characterized in that, The upper surface of the substrate (22) is provided with a boss (27), the bottom of the first protective plate (21) overlaps the upper surface of the boss (27), a stepped bonding surface is formed between the edge of the boss (27) and the upper surface of the substrate (22), and the inner wall of the second protective plate (251) is bonded to the stepped bonding surface.

5. The stepper motor structure with a waterproof mechanism according to claim 1, characterized in that, One end face of the two first protection plates (21) is connected by a plug structure. A positioning hole (24) is provided on the end face of one of the first protection plates (21), and a plug is provided on the end face of the other first protection plate (21). The shape of the plug is adapted to the positioning hole (24). A cavity (26) is provided on the inner side of the other end face between the two first protection plates (21).

6. The stepper motor structure with a waterproof mechanism according to claim 1, characterized in that, A locking mechanism (23) is symmetrically arranged at the edge of the substrate (22). The locking mechanism (23) is used to lock the first protective plate (21) and the filling mechanism (25). The locking mechanism (23) includes a locking mechanism (23) integrally formed at the edge of the substrate (22). A guide rod (233) is fixedly connected to the upper surface of the locking mechanism (23). The guide rod (233) is located at the outer edge of the first protective plate (21).

7. A stepper motor structure with a waterproof mechanism according to claim 6, characterized in that, A first pressure plate (234) is sleeved on the outer wall of the guide rod (233). The first pressure plate (234) is perpendicular to the guide rod (233), and the lower surface of the first pressure plate (234) overlaps the top of the first protective plate (21). The lower surface of the first pressure plate (234) has a slot whose shape matches the corner shape of the first protective plate (21).

8. A stepper motor structure with a waterproof mechanism according to claim 7, characterized in that, A lead screw (232) is rotatably mounted on the upper surface of the extension plate (231). A second pressure plate (235) is threaded onto the outer wall of the lead screw (232). During installation, the lower surface of the second pressure plate (235) is fixedly connected to the upper surface of the second protective plate (251), and a semi-circular groove is provided at one end of the second pressure plate (235) facing the limiting frame (253).

9. A stepper motor structure with a waterproof mechanism according to claim 8, characterized in that, The top of the guide rod (233) is fixedly connected to an anti-detachment baffle (236), and one side of the anti-detachment baffle (236) is in contact with the outer side of the second protective plate (251). The lead screw (232) passes through the anti-detachment baffle (236) and is threadedly connected to the first pressure plate (234).

10. A stepper motor structure with a waterproof mechanism according to claim 9, characterized in that, The end of the lead screw (232) is fixedly connected to a hexagonal rod body by bolts. The second pressure plate (235) is located above the anti-detachment baffle (236), and the first pressure plate (234) is located below the anti-detachment baffle (236). When the lead screw (232) is rotated, the first pressure plate (234) and the second pressure plate (235) move synchronously.

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