Electric trolley stroke lock

Abstract

The utility model discloses a kind of electric push rod stroke lock catch, belong to electric push rod technical field. Including base, limit sleeve, telescopic rod, the inside of base is equipped with motor, the inside of base is embedded with bearing in the top of motor, the inner ring of bearing is embedded with rotating shaft, motor output shaft and rotating shaft transmission connection, limit sleeve is installed in base, and inside is equipped with first threaded rod, the free end of rotating shaft is connected with first threaded rod, telescopic rod is slid in limit sleeve, and is connected with first threaded rod threadedly engaged, the outside of motor output shaft is equipped with gear, the outside of limit sleeve is equipped with shell, chuck is slid in the inside of shell, the side of base is equipped with opening, chuck is slid in opening, and is engaged with gear, the inside of shell is rotatably connected with second threaded rod, chuck and second threaded rod are engaged, the outside of shell is equipped with connecting shaft, the other end of connecting shaft is connected with second threaded rod, the outside of connecting shaft is equipped with positioning member.

Description

Technical Field

[0001] This utility model relates to the field of electric linear actuator technology, specifically to an electric linear actuator travel lock. Background Technology

[0002] Electric linear actuators, which convert the rotary motion of a motor into linear reciprocating motion, are widely used in smart homes, medical devices, and industrial automation. They control the push and pull of loads by extending and retracting the actuator. In practical applications, after the electric linear actuator drives the load to the preset stroke position, a locking structure is needed to maintain the stability of that position and prevent the actuator from retracting or shifting due to power failure or external force.

[0003] Currently, most electric linear actuators rely on motor self-locking for stroke locking, maintaining the actuator position through the motor's electromagnetic braking or threaded drive self-locking characteristics. However, this locking method has significant limitations: the locking force of the motor self-locking is limited by the motor's power and braking structure. Under heavy loads or sudden external impacts, slippage is prone to occur, causing the actuator to slowly retract or deviate. Furthermore, long-term reliance on motor self-locking to maintain position leads to continuous energy consumption and heat generation in the motor coils, accelerating motor aging and reducing equipment lifespan. Utility Model Content

[0004] The purpose of this utility model is to provide an electric push rod travel lock to solve the problems mentioned in the background art.

[0005] In view of the above problems, the technical solution proposed by this utility model is as follows:

[0006] An electric push rod travel lock includes a base, a limiting sleeve, and a telescopic rod. A motor is installed inside the base, and a bearing is embedded above the motor inside the base. A rotating shaft is embedded in the inner ring of the bearing. The output shaft of the motor is connected to the rotating shaft. The limiting sleeve is installed inside the base and has a first threaded rod inside. The free end of the rotating shaft is connected to the first threaded rod. The telescopic rod slides within the limiting sleeve and is threadedly engaged with the first threaded rod. The motor drives the first threaded rod to rotate via the rotating shaft, achieving stable extension and retraction of the telescopic rod within the limiting sleeve. A gear is installed on the outer side of the motor's output shaft. A housing is installed on the outer side of the limiting sleeve, and a chuck slides inside the housing. An opening is provided on the side of the base, and the chuck... The chuck slides within the opening and meshes with the gear. A second threaded rod is rotatably connected inside the housing. The chuck meshes with the second threaded rod, directly locking the motor output shaft. This avoids slippage and retraction issues caused by relying solely on motor self-locking, improving the stability and reliability of the stroke locking. A connecting shaft is installed on the outside of the housing. A handle is installed at one end of the connecting shaft, and the other end is connected to the second threaded rod. The chuck position can be adjusted via the handle, connecting shaft, and second threaded rod, making operation convenient and allowing flexible control of the locking and unlocking states. A positioning element is installed on the outside of the connecting shaft to limit its rotation. The positioning element fixes the connecting shaft, preventing accidental rotation that could loosen the chuck and ensuring the durability of the locking state.

[0007] Furthermore, the positioning component includes a first anti-loosening washer installed on the outside of the housing and a second anti-loosening washer sliding on the outside of the connecting shaft. The first and second anti-loosening washer engage with each other, which effectively restricts the rotation of the connecting shaft, prevents the chuck from loosening accidentally, and enhances the stability of the locking structure. The connecting shaft passes through the first anti-loosening washer, and a pair of sliding grooves are provided on the outside of the connecting shaft. A slider is installed on the inner ring of the second anti-loosening washer. The slider slides in the sliding groove and is elastically connected to the sliding groove. The sliding and elastic connection of the slider in the sliding groove ensures that the second anti-loosening washer can move axially with the connecting shaft to achieve engagement and disengagement, and can also maintain the engagement state through elastic force, making the operation flexible and the anti-loosening reliable.

[0008] Furthermore, the slide groove is provided with a spring between the slider and the handle. The two ends of the spring are connected to the slide groove and the slider respectively. The spring provides a continuous elastic thrust to the slider, ensuring that the second anti-loosening washer and the first anti-loosening washer are tightly engaged, further preventing the connecting shaft from rotating accidentally and improving the anti-loosening effect of the positioning component.

[0009] Furthermore, the output shaft, rotating shaft, first threaded rod, base, limit sleeve, telescopic rod, and gear of the motor are all coaxially arranged. The coaxial arrangement ensures that the force on each component is uniform, reduces vibration and wear caused by eccentricity, and extends the service life of the equipment.

[0010] Furthermore, the first anti-loosening washer, the second anti-loosening washer, the connecting shaft, and the second threaded rod are all coaxially arranged. The coaxial arrangement makes the engagement between the second anti-loosening washer and the first anti-loosening washer more uniform, avoids damage to the teeth caused by excessive local force, and extends the service life of the washer.

[0011] Furthermore, a limiting ring is installed at the bottom of the telescopic rod, and a pair of limiting grooves are opened on the side of the limiting ring. A pair of limiting strips are installed on the inner wall of the limiting sleeve. The limiting strips slide in the limiting grooves. The limiting strips cooperate with the limiting grooves to restrict the rotational freedom of the telescopic rod, ensuring that it only extends and retracts along the axial direction, and avoiding functional failure caused by the telescopic rod rotating synchronously with the first threaded rod.

[0012] Furthermore, a dustproof ring is installed on the inner wall of the limiting sleeve near its top. The dustproof ring can prevent external dust and impurities from entering the interior of the limiting sleeve, avoid contaminating the thread structure of the first threaded rod and the telescopic rod, prevent jamming or wear caused by impurities, and ensure the smooth operation and service life of the electric push rod.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: This electric linear actuator travel lock, through an independent mechanical locking structure, effectively solves the problems of insufficient locking force, easy slippage and retraction, and continuous energy consumption and aging of the motor caused by the reliance on motor self-locking in traditional electric linear actuators: When the telescopic rod reaches the preset position, turning the handle can drive the chuck to mesh with the gear on the motor output shaft through the connecting shaft and the second threaded rod, directly locking the motor output shaft. With the engagement and positioning of the first anti-loosening washer and the second anti-loosening washer, the locking is stable and reliable, avoiding position displacement caused by external force or power failure; at the same time, the motor does not need to work continuously, reducing energy consumption and heat generation, extending the service life of the motor, and improving the stability and durability of the electric linear actuator in load holding scenarios. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the electric push rod travel lock disclosed in an embodiment of the present utility model;

[0015] Figure 2 for Figure 1 Enlarged schematic diagram of structure A in the middle;

[0016] Figure 3 This is a cross-sectional structural schematic diagram of the electric push rod travel lock disclosed in an embodiment of the present utility model;

[0017] Figure 4 for Figure 3A magnified schematic diagram of the B-structure.

[0018] In the diagram: 1. Base; 2. Limiting sleeve; 3. Telescopic rod; 4. Housing; 5. First anti-loosening washer; 6. Connecting shaft; 7. Handle; 8. Second anti-loosening washer; 9. Slide groove; 10. Slider; 11. Spring; 12. Motor; 13. Gear; 14. Rotating shaft; 15. Bearing; 16. First threaded rod; 17. Chuck; 18. Second threaded rod. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1 - Figure 4 This utility model provides a technical solution: an electric push rod travel lock, including a base 1, a limiting sleeve 2, and a telescopic rod 3. A motor 12 is installed inside the base 1. A bearing 15 is embedded above the motor 12 inside the base 1. A rotating shaft 14 is embedded in the inner ring of the bearing 15. The output shaft of the motor 12 and the rotating shaft 14 are connected in a transmission connection. The limiting sleeve 2 is installed inside the base 1 and has a first threaded rod 16 inside. The free end of the rotating shaft 14 is connected to the first threaded rod 16. The telescopic rod 3 slides inside the limiting sleeve 2 and is threadedly engaged with the first threaded rod 16. A gear 13 is installed on the outer side of the output shaft of the motor 12. A housing 4 is installed on the outer side of the limiting sleeve 2. A chuck 17 slides inside the housing 4. An opening is provided on the side of the base 1, and the chuck 17 slides within the opening and engages with the gear 13. A second threaded rod 18 is rotatably connected inside the housing 4, and the chuck 17 and the second threaded rod 18 are engaged in a meshing connection. A connecting shaft 6 is installed on the outside of the housing 4. A handle 7 is installed on one end of the connecting shaft 6, and the other end of the connecting shaft 6 is connected to the second threaded rod 18. A positioning element is installed on the outside of the connecting shaft 6 to limit the rotation of the connecting shaft 6. When the electric push rod is working, the output shaft of the motor 12 rotates, which drives the first threaded rod 16 to rotate through the rotating shaft 14. Since the telescopic rod 3 is threadedly engaged with the first threaded rod 16 and limited by the limiting sleeve 2, the telescopic rod 3 makes a linear telescopic movement along the limiting sleeve 2. When the locking stroke is required, the handle 7 is turned, which drives the second threaded rod 18 to rotate through the connecting shaft 6, so that the chuck 17 slides along the housing 4 and passes through the opening of the base 1 to engage with the gear 13. After the gear 13 is locked, the output shaft of the motor 12 cannot rotate, thereby fixing the position of the first threaded rod 16 and the telescopic rod 3. The positioning element limits the rotation of the connecting shaft 6 to ensure that the engagement state of the chuck 17 and the gear 13 is stable and to avoid external force causing locking failure.

[0021] As an embodiment of this utility model, the positioning component further includes a first anti-loosening washer 5 installed on the outside of the housing 4 and a second anti-loosening washer 8 sliding on the outside of the connecting shaft 6. The first anti-loosening washer 5 and the second anti-loosening washer 8 are engaged. The connecting shaft 6 passes through the first anti-loosening washer 5. A pair of sliding grooves 9 are provided on the outside of the connecting shaft 6. A slider 10 is installed on the inner ring of the second anti-loosening washer 8. The slider 10 slides in the sliding groove 9 and is elastically connected to the sliding groove 9. When it is necessary to lock the connecting shaft 6, the second anti-loosening washer 8 is released and moves towards the first anti-loosening washer 5 until the teeth of the two are engaged. The engagement of the teeth prevents the connecting shaft 6 from rotating. The slider 10 slides in the sliding groove 9 to provide guidance for the second anti-loosening washer 8. At the same time, the elastic force pushes the slider 10 towards the first anti-loosening washer 5 to maintain the engagement of the two washer 10. When unlocking, the elastic force is overcome to pull the second anti-loosening washer 8 to separate the two. The connecting shaft 6 can rotate freely to adjust the position of the chuck 17.

[0022] As an embodiment of this utility model, the slide groove 9 is further provided with a spring 11 located between the slider 10 and the handle 7. The two ends of the spring 11 are connected to the slide groove 9 and the slider 10 respectively. When the spring 11 is in its natural state, it pushes the slider 10 to cause the second anti-loosening washer 8 to engage with the first anti-loosening washer 5. When the second anti-loosening washer 8 is pulled, the slider 10 compresses the spring 11, and the two washer separates. After being released, the spring 11 returns to its original position and pushes the slider 10 to make the two washer re-engage, thereby achieving automatic locking.

[0023] As an embodiment of this utility model, the output shaft of the motor 12, the rotating shaft 14, the first threaded rod 16, the base 1, the limiting sleeve 2, the telescopic rod 3, and the gear 13 are all coaxially arranged, with each component having a coaxial centerline. The rotational force of the output shaft of the motor 12 is transmitted vertically to the first threaded rod 16 through the rotating shaft 14. The telescopic rod 3 moves linearly along the axial direction, and the gear 13 rotates coaxially with the output shaft of the motor. The engagement between the chuck 17 and the gear 13 is more precise, reducing the impact of lateral forces on the structure.

[0024] As an embodiment of this utility model, the first anti-loosening washer 5, the second anti-loosening washer 8, the connecting shaft 6, and the second threaded rod 18 are all coaxially arranged, with each component having a coaxial centerline. When the connecting shaft 6 rotates, the second threaded rod 18 rotates synchronously and coaxially, and the chuck 17 slides along the axial direction. The teeth of the first and second anti-loosening washers are in uniform contact to ensure consistent biting force and effectively restrict the rotation of the connecting shaft 6.

[0025] As an embodiment of this utility model, a limiting ring is further installed at the bottom of the telescopic rod 3. A pair of limiting grooves are opened on the side of the limiting ring, and a pair of limiting strips are installed on the inner wall of the limiting sleeve 2. The limiting strips slide in the limiting grooves. When the telescopic rod 3 extends or retracts, the limiting strips on the inner wall of the limiting sleeve 2 slide in the limiting grooves of the limiting ring. The cooperation of the two prevents the telescopic rod 3 from rotating, ensuring that it only makes linear motion. When the telescopic rod 3 extends to its maximum stroke, the limiting ring contacts the top of the limiting sleeve 2, restricting it from continuing to extend.

[0026] As an embodiment of this utility model, a dustproof ring is further installed on the inner wall of the limiting sleeve 2 near its top. The dustproof ring fits tightly against the outer wall of the telescopic rod 3 and the inner wall of the limiting sleeve 2 to form a sealing barrier. When the telescopic rod 3 extends or retracts, the dustproof ring can scrape off the dust attached to its surface and prevent impurities from entering the transmission structure inside the limiting sleeve 2.

[0027] It should be noted that all standard parts used in this application can be purchased from the market, and can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. The control method is automatic control through a controller. The control circuit can be implemented by simple programming by those skilled in the art and is common knowledge in the field. Furthermore, since this application is mainly used to protect mechanical devices, this application will not explain the control method and circuit connection in detail.

Claims

1. A travel lock for an electric push rod, characterized in that, The device includes a base (1), a limiting sleeve (2), and a telescopic rod (3). A motor (12) is installed inside the base (1). A bearing (15) is embedded above the motor (12) inside the base (1). A rotating shaft (14) is embedded in the inner ring of the bearing (15). The output shaft of the motor (12) is connected to the rotating shaft (14). The limiting sleeve (2) is installed inside the base (1) and has a first threaded rod (16) inside. The free end of the rotating shaft (14) is connected to the first threaded rod (16). The telescopic rod (3) slides inside the limiting sleeve (2) and is threadedly engaged with the first threaded rod (16). A gear is installed on the outer side of the output shaft of the motor (12). (13) A housing (4) is installed on the outside of the limiting sleeve (2). A chuck (17) slides inside the housing (4). An opening is provided on the side of the base (1). The chuck (17) slides in the opening and meshes with the gear (13). A second threaded rod (18) is rotatably connected inside the housing (4). The chuck (17) and the second threaded rod (18) mesh together. A connecting shaft (6) is installed on the outside of the housing (4). A handle (7) is installed at one end of the connecting shaft (6). The other end of the connecting shaft (6) is connected to the second threaded rod (18). A positioning element is installed on the outside of the connecting shaft (6). The positioning element is used to limit the rotation of the connecting shaft (6).

2. The electric push rod travel lock according to claim 1, characterized in that, The positioning component includes a first anti-loosening washer (5) installed on the outside of the housing (4) and a second anti-loosening washer (8) sliding on the outside of the connecting shaft (6). The first anti-loosening washer (5) and the second anti-loosening washer (8) engage. The connecting shaft (6) passes through the first anti-loosening washer (5). A pair of sliding grooves (9) are provided on the outside of the connecting shaft (6). A slider (10) is installed on the inner ring of the second anti-loosening washer (8). The slider (10) slides in the sliding groove (9) and is elastically connected to the sliding groove (9).

3. The electric push rod travel lock according to claim 2, characterized in that, The slide (9) has a spring (11) located between the slider (10) and the handle (7), and the two ends of the spring (11) are connected to the slide (9) and the slider (10) respectively.

4. The electric push rod travel lock according to claim 1, characterized in that, The output shaft, rotating shaft (14), first threaded rod (16), base (1), limit sleeve (2), telescopic rod (3), and gear (13) of the motor (12) are all coaxially arranged.

5. The electric push rod travel lock according to claim 2, characterized in that, The first anti-loosening washer (5), the second anti-loosening washer (8), the connecting shaft (6), and the second threaded rod (18) are all coaxially arranged.

6. The electric push rod travel lock according to claim 1, characterized in that, The bottom end of the telescopic rod (3) is equipped with a limiting ring, and a pair of limiting grooves are provided on the side of the limiting ring. A pair of limiting strips are installed on the inner wall of the limiting sleeve (2), and the limiting strips slide in the limiting grooves.

7. The electric push rod travel lock according to claim 1, characterized in that, The inner wall of the limiting sleeve (2) is fitted with a dustproof ring near its top.

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