Dynamic waterproof structure of LPP actuator

Abstract

The utility model discloses an LPP actuator dynamic waterproof structure which comprises a shell, a driving motor and a lifting shaft, the driving motor and the lifting shaft are arranged in the shell, an output shaft of the driving motor is in transmission connection with a locking piece, and the lifting shaft has a free lifting movable state and a locking state locked in the shell. The driving motor drives the locking piece to move in the direction close to or away from the lifting shaft, so that the lifting shaft is switched between a movable state and a locking state, a watertight cavity for containing the lifting shaft is formed in the shell, in the movable state, the lifting motion of the lifting shaft drives the volume of the watertight cavity to change correspondingly, and the watertight cavity is provided with an air vent. According to the utility model, not only can the driving and locking of the lifting shaft be realized, but also the instantaneous internal and external pressure difference generated during the dynamic movement of the lifting shaft can be fundamentally eliminated, so that the path for sucking water is blocked, and the reliable dynamic water prevention is realized.

Description

Technical Field

[0001] This utility model relates to the field of linear actuator technology, and in particular to a dynamic waterproof structure for an LPP actuator. Background Technology

[0002] With the development of automotive intelligence and electrification, various electronic actuators, such as linear actuators (LPP actuators) used in systems like automatic tailgates, electric sunroofs, charging port covers, and active grille shutters, are increasingly widely used in vehicles. These actuators are typically installed on the exterior of the vehicle or in water-prone areas, and their working environment is complex and variable, placing extremely high demands on their waterproof and dustproof performance.

[0003] Currently, most common waterproof actuators use static sealing methods, such as setting sealing rings at the housing joints and using oil seals or O-rings at the shaft extensions. However, when the actuator's lifting shaft extends outward, the volume of its internal watertight cavity increases instantaneously, causing the air pressure inside the cavity to momentarily fall below the external atmospheric pressure, forming a negative pressure. Under this negative pressure, traditional static sealing structures will actively draw external liquids (water, oil mist, etc.) into the actuator through tiny gaps or sealing lips, causing waterproofing failure. Utility Model Content

[0004] The purpose of this invention is to provide a dynamic waterproof structure for an LPP actuator, which can not only drive and lock the lifting shaft, but also fundamentally eliminate the instantaneous internal and external pressure difference generated during the dynamic movement of the lifting shaft, thereby blocking the path of water being sucked in and achieving reliable dynamic waterproofing.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a dynamic waterproof structure for an LPP actuator, comprising a housing, and a drive motor and a lifting shaft disposed within the housing. A locking member is drivenly connected to the output shaft of the drive motor. The lifting shaft has a freely moving state and a locked state locked to the housing. The drive motor drives the locking member to move towards or away from the lifting shaft, causing the lifting shaft to switch between the moving state and the locked state. A watertight cavity is provided within the housing to accommodate the lifting shaft. In the moving state, the moving motion of the lifting shaft drives a corresponding change in the volume of the watertight cavity. The watertight cavity is provided with a vent, and the vent is sealed with a waterproof and breathable membrane.

[0006] By adopting the above technical solution, when the lifting shaft moves, the volume of the watertight cavity changes, and external gas can smoothly enter and exit through the waterproof and breathable membrane, avoiding negative or positive pressure resistance and ensuring smooth movement; while the waterproof and breathable membrane can effectively prevent liquid water, dust and other substances from entering the shell, thus achieving long-term reliable protection under dynamic working conditions.

[0007] A further feature of this invention is that the vent is composed of a plurality of vent holes arranged in a circumferential array, and the waterproof and breathable membrane is sealed on the end face where the vent holes are located.

[0008] By adopting the above technical solutions, the effective air permeability area of ​​the waterproof and breathable membrane is increased, allowing the air pressure inside and outside the chamber to reach equilibrium more quickly. The array layout also helps the airflow pass through evenly, avoids stress concentration, and extends the service life of the waterproof and breathable membrane, while taking into account both structural aesthetics and protective performance.

[0009] A further feature of this invention is that the housing has a lifting port for the lifting shaft to extend out, and the lifting port is circumferentially provided with a sealing element that is sealed to the lifting shaft.

[0010] By adopting the above technical solution, the key movement gap of the lifting shaft extending out of the housing is effectively sealed, directly preventing external liquids and contaminants from seeping into the housing along the surface of the lifting shaft, thus enhancing the sealing reliability of the overall structure.

[0011] A further feature of this invention is that a sealing groove for accommodating the sealing element is provided on the lifting port, and a stepped portion is formed on the groove wall of the sealing groove near the lifting shaft, with part of the sealing element placed on the stepped portion and sealingly abutting against the lifting shaft.

[0012] By adopting the above technical solution, a stable and precise installation and positioning space is provided for the seal. In addition, some of the seal is placed on the step, so that its sealing contact with the lifting shaft is more firm and uniform, preventing the seal from shifting or deforming due to force or vibration during long-term use, thereby maintaining the stability of the sealing performance for a long time.

[0013] A further feature of this invention is that the housing has a sealing opening corresponding to the position of the locking member, the sealing member extends toward the sealing opening and covers the sealing opening, and the sealing opening has an open state and a closed state relative to the sealing member.

[0014] By adopting the above technical solution, the sealing problem of two motion interfaces is solved with one component; when the seal is placed on the sealing port, it can effectively seal the shell and prevent water ingress and contamination; when it is opened, maintenance personnel can directly observe the working status of key components such as internal locking parts and drive motor output shaft through the sealing port or carry out inspection and debugging, which simplifies the maintenance process and eliminates the need to disassemble the actuator as a whole.

[0015] A further feature of this invention is that the locking member is provided with a positioning block extending out of the sealing opening, and the sealing member is provided with a positioning groove for accommodating the positioning block, the positioning groove constraining the displacement path of the locking member perpendicular to the transmission direction.

[0016] By adopting the above technical solution, precise guidance and limiting are provided for the movement of the locking component in the transmission direction. This effectively prevents unnecessary swaying or shaking of the locking component during operation, ensuring accurate and reliable engagement and disengagement between the locking component and the card seat on the lifting shaft, and improving the working stability of the locking component.

[0017] A further feature of this invention is that: a retaining seat is provided at one end of the lifting shaft near the locking member; the locking member is provided with retaining teeth extending toward the retaining seat; and the retaining seat is provided with a retaining groove corresponding to the position of the retaining teeth, the retaining groove engaging with the retaining teeth.

[0018] By adopting the above technical solution, the locking teeth can be firmly locked when embedded in the slot, and the lifting shaft can be completely released when separated. The structure is simple and intuitive, and the transmission is reliable.

[0019] A further feature of this invention is that one end of the card holder extends into the lifting shaft and forms a mating part. A first limiting groove is provided on the periphery of the mating part, and a limiting block is provided on the first limiting groove. A second limiting groove is provided on the inner wall of the lifting shaft to accommodate the limiting block. The limiting block is placed in the second limiting groove and abuts against the first limiting groove, so that the card holder is fixedly connected to the lifting shaft.

[0020] By adopting the above technical solution, a stable and anti-rotation axial connection between the card holder and the lifting shaft is achieved. This internal connection method has a compact structure and high connection strength, which can ensure that the locking force is effectively transmitted from the card holder to the entire lifting shaft, prevent relative movement between the two, and ensure the reliability of the locking performance.

[0021] A further feature of this invention is that the housing is formed with a first fixed shaft extending inward therefrom, the first fixed shaft passes through the card seat, a first elastic member is sleeved on the first fixed shaft and abuts against the card seat, a second fixed shaft is fixedly connected to the first fixed shaft, a hollow cavity is formed inside the lifting shaft to accommodate the second fixed shaft, a second elastic member is disposed inside the hollow cavity, the second elastic member is sleeved on the second fixed shaft and abuts against the lifting shaft.

[0022] By adopting the above technical solution, the lifting shaft is provided with dual elastic support and precise guidance. This structure makes the lifting shaft's lifting movement more stable and smooth, effectively absorbs the impact or vibration during movement, reduces wear and jamming risks, and provides the necessary elastic force for the lifting shaft to reset or buffer in the active state.

[0023] A further feature of this invention is that a micro switch is provided inside the housing, and a locking strip is fixedly provided on the lifting shaft. When the lifting shaft is pressed downward by an external force, the locking strip is locked to the micro switch; when the lifting shaft is pressed upward by an external force, the locking strip is released from the micro switch.

[0024] By adopting the above technical solution, automatic locking and releasing in bidirectional motion is realized. The structure is simple and easy to implement. At the same time, since the entire micro switch 8 is also located inside the housing 1, the watertight cavity 5 and sealing element 6 inside the housing 1 can ensure that the working environment of the micro switch 8 is not affected by external moisture, thus ensuring its long-term reliability and stability.

[0025] In summary, this utility model has the following beneficial effects:

[0026] 1. A locking component is connected to the output shaft of the drive motor. The lifting shaft has a free-moving state and a locked state locked to the housing. The drive motor drives the locking component to move closer to or away from the lifting shaft, switching the lifting shaft between the active and locked states. The housing has a watertight cavity to accommodate the lifting shaft. In the active state, the lifting shaft's movement causes a corresponding change in the volume of the watertight cavity. The watertight cavity is equipped with a vent, which is covered by a waterproof and breathable membrane. When the lifting shaft moves, the volume of the watertight cavity changes, allowing external gas to pass smoothly through the waterproof and breathable membrane, avoiding negative or positive pressure resistance and ensuring smooth movement. The waterproof and breathable membrane also effectively prevents liquid water, dust, etc., from entering the housing, thus achieving long-term reliable protection under dynamic working conditions.

[0027] 2. The housing has a sealing opening corresponding to the position of the locking element. The sealing element extends towards the sealing opening and covers it. The sealing opening has an open and closed state relative to the sealing element. That is, the part of the sealing element corresponding to the sealing opening can be removed, allowing the sealing opening to switch from the closed state to the open state. The sealing problem of two motion interfaces is solved with a single component. When the sealing element covers the sealing opening, it can effectively seal the housing and prevent water ingress and contamination. When it is open, maintenance personnel can directly observe the working status of key components such as the internal locking element and the output shaft of the drive motor through the sealing opening, or perform inspection and debugging, simplifying the maintenance process and eliminating the need to disassemble the actuator as a whole.

[0028] 3. The locking component is equipped with a positioning block extending out of the sealing port, and the sealing component has a positioning groove to accommodate the positioning block. The positioning groove constrains the displacement path of the locking component perpendicular to the transmission direction, providing precise guidance and limitation for the movement of the locking component in the transmission direction. This effectively prevents unnecessary swaying or shaking of the locking component during operation, ensuring accurate and reliable engagement and disengagement with the card seat on the lifting shaft, and improving the working stability of the locking component.

[0029] 4. A first fixed shaft extending inwards from the shell is formed, passing through the retaining seat. A first elastic element abutting against the retaining seat is sleeved on the first fixed shaft. A second fixed shaft is fixedly connected to the first fixed shaft. A hollow cavity is formed inside the lifting shaft to accommodate the second fixed shaft. A second elastic element is placed inside the hollow cavity, sleeved on the second fixed shaft and abutting against the lifting shaft, providing double elastic support and precise guidance for the lifting shaft. This structure makes the lifting shaft's lifting movement smoother and more stable, effectively absorbing impacts or vibrations during movement, reducing wear and jamming risks. At the same time, it provides the necessary elastic force for the lifting shaft to reset or buffer in the active state, preventing excessive deformation of the sealing lip due to excessive movement and failure, further improving dynamic waterproof performance.

[0030] 5. The ventilation port consists of several ventilation holes arranged in a circular array. The waterproof and breathable membrane is sealed on the end face where the ventilation holes are located, which increases the effective air permeability area of ​​the waterproof and breathable membrane, allowing the air pressure inside and outside the chamber to reach equilibrium more quickly. The array layout also helps the airflow to pass through evenly, avoids stress concentration, and extends the service life of the waterproof and breathable membrane, while taking into account both structural aesthetics and protective performance. Attached Figure Description

[0031] Figure 1 This is a perspective view of the present invention.

[0032] Figure 2 This is a schematic diagram showing the disassembled waterproof and breathable membrane and shell of this utility model.

[0033] Figure 3 This is a cross-sectional view of the lifting shaft of this utility model in the locked state.

[0034] Figure 4 This is a cross-sectional view of the lifting shaft of this utility model in the active state.

[0035] Figure 5 This is a cross-sectional view of the transmission between the drive motor and the locking component of this utility model.

[0036] Figure 6 This is a schematic diagram of the internal structure of this utility model after omitting the shell and seal.

[0037] In the diagram: 1. Housing; 11. Lifting port; 111. Sealing groove; 112. Stepped part; 12. Sealing port; 13. First fixed shaft; 131. First elastic element; 14. Second fixed shaft; 141. Second elastic element; 15. Hollow cavity; 2. Drive motor; 3. Lifting shaft; 31. Second limiting groove; 32. Locking strip; 4. Locking element; 41. Positioning block; 42. Locking tooth; 5. Watertight cavity; 51. Vent; 511. Vent hole; 52. Waterproof and breathable membrane; 6. Sealing element; 61. Positioning groove; 7. Card seat; 71. Card slot; 72. Mating part; 721. First limiting groove; 722. Limiting block; 8. Micro switch. Detailed Implementation

[0038] The present invention will be further described below with reference to the accompanying drawings.

[0039] A dynamic waterproof structure for LPP actuators, such as Figure 1-6 As shown, the device includes a housing 1, a drive motor 2 and a lifting shaft 3 disposed within the housing 1. A locking member 4 is driven and connected to the output shaft of the drive motor 2. The lifting shaft 3 has a freely movable state and a locked state locked to the housing 1. The drive motor 2 drives the locking member 4 to move towards or away from the lifting shaft 3, causing the lifting shaft 3 to switch between the movable state and the locked state. Specifically, the drive motor 2 drives the locking member 4 to move towards the lifting shaft 3 and engages with the lifting shaft 3, thus forming the locked state of the lifting shaft 3, in which case the lifting shaft 3 cannot move. The drive motor 2 drives the locking member 4 to move away from the lifting shaft 3, releasing the locking member 4 from the lifting shaft 3, thus forming the movable state of the lifting shaft 3, in which case the lifting shaft 3 can normally perform its lifting function. The housing 1 is provided with a housing for... The watertight cavity 5 of the lifting shaft 3, in the active state, causes a corresponding change in volume due to the lifting and lowering movement of the lifting shaft 3. That is, when the lifting shaft 3 rises, the volume of the watertight cavity 5 increases, resulting in a decrease in air pressure inside the watertight cavity 5; when the lifting shaft 3 descends to reset, the volume of the watertight cavity 5 decreases, resulting in an increase in air pressure inside the watertight cavity 5. The watertight cavity 5 is provided with a vent 51, which is covered with a waterproof and breathable membrane 52. The waterproof and breathable membrane 52 is a thin film made of high molecular polymer, which is adhered to the end face of the vent 51. When the lifting shaft 3 moves, the volume of the watertight cavity 5 changes, and external gas can pass through the waterproof and breathable membrane 52 smoothly in and out, avoiding negative or positive pressure resistance and ensuring smooth movement. The waterproof and breathable membrane 52 can also effectively prevent liquid water, dust, etc. from entering the interior of the housing 1, thereby achieving long-term reliable protection under dynamic working conditions.

[0040] Preferably, the vent 51 is composed of a plurality of vent holes 511 arranged in a circumferential array. The waterproof and breathable membrane 52 covers the end face where the vent holes 511 are located, which increases the effective air permeability area of ​​the waterproof and breathable membrane 52, so that the air pressure inside and outside the cavity can reach equilibrium more quickly. The array layout also helps the airflow to pass through evenly, avoids stress concentration, and extends the service life of the waterproof and breathable membrane 52, while taking into account both structural aesthetics and protective performance.

[0041] Preferably, the housing 1 has a lifting port 11 for the lifting shaft 3 to extend out. The lifting port 11 is circumferentially provided with a sealing element 6 that is sealed to the lifting shaft 3. The sealing element 6 is made of rubber, which effectively seals the critical movement gap of the lifting shaft 3 extending out of the housing 1, directly preventing external liquids and contaminants from seeping into the interior of the housing 1 along the surface of the lifting shaft 3, thereby enhancing the sealing reliability of the overall structure.

[0042] Preferably, the lifting port 11 has a sealing groove 111 for accommodating the sealing element 6. The sealing groove 111 forms a stepped portion 112 near the groove wall of the lifting shaft 3. Part of the sealing element 6 is placed on the stepped portion 112 and seals against the lifting shaft 3, providing a stable and precise installation and positioning space for the sealing element 6. In addition, placing part of the sealing element 6 on the stepped portion 112 makes its sealing contact with the lifting shaft 3 more firm and uniform, preventing the sealing element 6 from shifting or deforming due to force or vibration during long-term use, thereby maintaining the stability of the sealing performance for a long time.

[0043] Preferably, the housing 1 has a sealing opening 12 corresponding to the position of the locking member 4. The sealing member 6 extends toward the sealing opening 12 and covers the sealing opening 12. The sealing opening 12 has an open state and a closed state relative to the sealing member 6. That is, the part of the sealing member 6 corresponding to the sealing opening 12 can be removed, so that the sealing opening 12 switches from the closed state to the open state. The sealing problem of two motion interfaces is solved with one component. When the sealing member 6 covers the sealing opening 12, it can effectively seal the housing 1 and prevent water ingress and contamination. When it is open, maintenance personnel can directly observe the working status of key components such as the internal locking member 4 and the output shaft of the drive motor 2 through the sealing opening 12 or perform inspection and debugging, which simplifies the maintenance process and eliminates the need to disassemble the actuator as a whole.

[0044] Preferably, the locking member 4 is provided with a positioning block 41 extending out of the sealing port 12, and the sealing member 6 is provided with a positioning groove 61 for accommodating the positioning block 41. The length of the positioning groove 61 is at least greater than the distance from which the locking member 4 is displaced to engage with the card seat 7 on the lifting shaft 3, so as to prevent the positioning block 41 from getting stuck in the positioning groove 61 during the displacement of the locking member 4. The positioning groove 61 constrains the displacement path of the locking member 4 in the direction perpendicular to the transmission direction (i.e., the displacement direction of the locking member 4 towards or away from the lifting shaft 3), providing precise guidance and limitation for the movement of the locking member 4 in the transmission direction. This effectively prevents unnecessary swaying or shaking of the locking member 4 during the operation, ensuring that its engagement and disengagement with the card seat 7 on the lifting shaft 3 are accurate and reliable, and improving the working stability of the locking member 4.

[0045] Preferably, a retaining seat 7 is provided at one end of the lifting shaft 3 near the locking member 4. The locking member 4 is provided with retaining teeth 42 extending toward the retaining seat 7. The retaining seat 7 is provided with a retaining groove 71 corresponding to the position of the retaining teeth 42. The retaining groove 71 engages with the retaining teeth 42. The retaining teeth 42 can be firmly locked when embedded in the retaining groove 71, and the lifting shaft 3 is completely released when separated. The structure is simple and intuitive, and the transmission is reliable.

[0046] Preferably, one end of the card holder 7 extends into the lifting shaft 3, forming a mating part 72. A first limiting groove 721 is provided on the periphery of the mating part 72, and a limiting block 722 is provided on the first limiting groove 721. A second limiting groove 31 is provided on the inner wall of the lifting shaft 3 to accommodate the limiting block 722. The limiting block 722 is placed in the second limiting groove 31 and abuts against the first limiting groove 721, so that the card holder 7 and the lifting shaft 3 are fixedly connected. This achieves an anti-rotation and stable axial connection between the card holder 7 and the lifting shaft 3. This internal connection method has a compact structure and high connection strength, which can ensure that the locking force is effectively transmitted from the card holder 7 to the entire lifting shaft 3, preventing relative movement between the two and ensuring the reliability of the locking performance.

[0047] Preferably, the housing 1 is formed with a first fixed shaft 13 extending inward therein. The first fixed shaft 13 passes through the card holder 7. A first elastic element 131, which is a spring, is sleeved on the first fixed shaft 13 and abuts against the card holder 7. A second fixed shaft 14 is fixedly connected to the first fixed shaft 13. A hollow cavity 15 is formed inside the lifting shaft 3 to accommodate the second fixed shaft 14. A second elastic element 141, which is a spring, is disposed inside the hollow cavity 15. The second elastic element 141 is sleeved on the second fixed shaft 14 and abuts against the lifting shaft 3, providing double elastic support and precise guidance for the lifting shaft 3. This structure makes the lifting movement of the lifting shaft 3 more stable and smooth, effectively absorbing the impact or vibration during movement, reducing wear and jamming risks. At the same time, it provides the necessary elastic force for the lifting shaft 3 to reset or buffer in the active state, avoiding excessive deformation of the sealing lip due to excessive movement and failure, further improving the dynamic waterproof performance.

[0048] Preferably, a micro switch 8 is provided inside the housing 1, and a retaining bar 32 is fixedly provided on the lifting shaft 3. When the lifting shaft 3 is pressed downwards (i.e., retracted into the housing 1) by external pressure (e.g., by a user's finger or an external mechanism), and when the retaining bar 32 moves to a predetermined position, its lower end or sidewall contacts and presses against the spring or contact of the micro switch 8, thereby triggering the micro switch 8 to connect or disconnect its internal circuit. At this time, the retaining bar 32 is held in place by the spring or hook-like structure of the micro switch 8. When locked and held in a pressed state, the micro switch 8 outputs an electrical signal indicating "pressed" or "lowered to position" to the control circuit. When the lifting shaft 3 is pressed upward (i.e., extends out of the housing 1), the lifting shaft 3 drives the locking strip 32 to move upward synchronously. The upward movement of the locking strip 32 disengages it from the micro switch 8, releasing the pressure on the micro switch 8. The micro switch 8 resets, and at this time, the locking strip 32 is released from the micro switch 8, which outputs an electrical signal indicating "reset" or "raised to position". Through the above structure, the control circuit (not shown in the figure) can accurately determine whether the lifting shaft 3 is currently in an extended or retracted state based on the electrical signal output by the micro switch 8, and control the start and stop of the drive motor 2 accordingly to achieve automated control. At the same time, since the entire micro switch 8 is also located inside the housing 1, the watertight cavity 5 and the sealing element 6 inside the housing 1 can ensure that the working environment of the micro switch 8 is not affected by external moisture, ensuring its long-term reliability and stability.

[0049] It should be noted that the specific lifting and resetting structure for the lifting shaft 3 to achieve the lifting function is a press-type elastic self-locking mechanism, similar to the lifting device of a ballpoint pen refill. This is a conventional technical means, and its working principle will not be described in detail. This application is not an innovative design in this regard, so it will not be described in detail.

[0050] The above description is only a preferred embodiment of the present utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model patent application are included in the scope of the present utility model patent application.

Claims

1. A dynamic waterproof structure for an LPP actuator, comprising a housing (1), and a drive motor (2) and a lifting shaft (3) disposed within the housing (1), characterized in that: A locking member (4) is connected to the output shaft of the drive motor (2). The lifting shaft (3) has a free lifting and lowering active state and a locked state locked to the housing (1). The drive motor (2) drives the locking member (4) to move towards or away from the lifting shaft (3), so that the lifting shaft (3) switches between the active state and the locked state. A watertight cavity (5) is provided inside the housing (1) to accommodate the lifting shaft (3). In the active state, the lifting and lowering movement of the lifting shaft (3) drives the volume of the watertight cavity (5) to change accordingly. The watertight cavity (5) is provided with a vent (51), and the vent (51) is covered with a waterproof and breathable membrane (52).

2. The dynamic waterproof structure for an LPP actuator according to claim 1, characterized in that: The vent (51) is composed of a plurality of vent holes (511) arranged in a circumferential array, and the waterproof and breathable membrane (52) is sealed on the end face where the vent holes (511) are located.

3. The dynamic waterproof structure for an LPP actuator according to claim 1, characterized in that: The housing (1) has a lifting port (11) for the lifting shaft (3) to extend out, and the lifting port (11) is provided with a sealing element (6) that is sealed to the lifting shaft (3) in the circumferential direction.

4. The dynamic waterproof structure for an LPP actuator according to claim 3, characterized in that: The lifting port (11) is provided with a sealing groove (111) for accommodating the sealing element (6). The sealing groove (111) forms a stepped portion (112) near the groove wall of the lifting shaft (3). Part of the sealing element (6) is placed on the stepped portion (112) and seals against the lifting shaft (3).

5. The dynamic waterproof structure for an LPP actuator according to claim 3, characterized in that: The housing (1) has a sealing opening (12) corresponding to the position of the locking member (4). The sealing member (6) extends toward the sealing opening (12) and covers the sealing opening (12). The sealing opening (12) has an open state and a closed state relative to the sealing member (6).

6. The dynamic waterproof structure for an LPP actuator according to claim 5, characterized in that: The locking member (4) is provided with a positioning block (41) extending out of the sealing port (12), and the sealing member (6) is provided with a positioning groove (61) for accommodating the positioning block (41). The positioning groove (61) constrains the displacement path of the locking member (4) perpendicular to the transmission direction.

7. The dynamic waterproof structure for an LPP actuator according to claim 1, characterized in that: The lifting shaft (3) is provided with a card seat (7) at one end near the locking member (4). The locking member (4) is provided with a card tooth (42) extending toward the card seat (7). The card seat (7) is provided with a card groove (71) corresponding to the position of the card tooth (42). The card groove (71) engages with the card tooth (42).

8. The dynamic waterproof structure for an LPP actuator according to claim 7, characterized in that: One end of the card holder (7) extends into the lifting shaft (3) and forms a mating part (72). A first limiting groove (721) is provided on the periphery of the mating part (72). A limiting block (722) is provided on the first limiting groove (721). A second limiting groove (31) is provided on the inner wall of the lifting shaft (3) to accommodate the limiting block (722). The limiting block (722) is placed in the second limiting groove (31) and abuts against the first limiting groove (721), so that the card holder (7) and the lifting shaft (3) are fixedly connected.

9. The dynamic waterproof structure for an LPP actuator according to claim 7, characterized in that: The housing (1) is formed with a first fixed shaft (13) extending inward therein. The first fixed shaft (13) passes through the card holder (7). A first elastic element (131) is sleeved on the first fixed shaft (13) and abuts against the card holder (7). A second fixed shaft (14) is fixedly connected to the first fixed shaft (13). A hollow cavity (15) is opened in the lifting shaft (3) to accommodate the second fixed shaft (14). A second elastic element (141) is provided in the hollow cavity (15). The second elastic element (141) is sleeved on the second fixed shaft (14) and abuts against the lifting shaft (3).

10. The dynamic waterproof structure for an LPP actuator according to claim 1, characterized in that: A micro switch (8) is provided inside the housing (1), and a locking strip (32) is fixedly provided on the lifting shaft (3). When the lifting shaft (3) is pressed downward by the outside, the locking strip (32) is locked to the micro switch (8); when the lifting shaft (3) is pressed upward by the outside, the locking strip (32) is released from the micro switch (8).

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