Linear pushrod device with overload protection

Abstract

This utility model discloses a linear actuator device with overload protection in the field of linear actuator technology. It includes a housing, on which a brake motor is fixedly mounted. The output shaft of the brake motor is connected to a rotating shaft via a coupling. A lead screw is rotatably connected inside the housing. A slider is threaded onto the lead screw, and a push rod is fixedly connected to the slider. A push-pull block is fixedly connected to the other end of the push rod. By incorporating a locking block, a protective component, and an adjusting component, this utility model allows the rotating shaft to drive the lead screw to rotate via the protective component after the brake motor starts. This enables the slider to drive the push rod and push-pull block to move along the axial direction of the lead screw. When the push-pull block encounters excessive resistance while pushing or pulling an object, the rotating shaft automatically disconnects from the lead screw via the protective component, thus preventing the brake motor from burning out and achieving overload protection, avoiding the phenomenon of the brake motor burning out due to excessive load.

Description

Technical Field

[0001] This utility model relates to the field of linear actuator technology, and in particular to a linear actuator device with overload protection. Background Technology

[0002] Linear linear actuators, also known as electric linear actuators, are circuit-driven devices that convert the rotary motion of an electric motor into the linear reciprocating motion of a linear actuator. They are widely used in medical devices, furniture, industrial instruments, home decoration, robotics, and other fields. Linear linear actuators can automatically complete operations such as pushing, pulling, transferring, and lifting items, providing high convenience.

[0003] However, existing technologies have some problems: in the design of traditional linear actuators, the transmission structure, such as the lead screw, is often rigidly or directly connected to the motor. This direct power coupling method has a significant drawback: when the output end of the actuator is subjected to excessive load during the execution of the task, the load will be directly transmitted to the motor through the transmission mechanism without any buffer, which can easily cause the motor to burn out due to excessive load. Therefore, we propose a linear actuator with overload protection. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a linear push rod device with overload protection. By incorporating protective components, it prevents the brake motor from burning out due to excessive load.

[0005] The purpose of this utility model is achieved as follows: A linear push rod device with overload protection includes a housing, on which a brake motor is fixedly mounted. The output shaft of the brake motor is connected to a rotating shaft via a coupling. A lead screw is rotatably connected inside the housing. A slider is threaded onto the lead screw, and a push rod is fixedly connected to the slider. A push-pull block is fixedly connected to the other end of the push rod. The rotating shaft and the lead screw are connected by a protective component, which can prevent the rotating shaft from being overloaded and damaging the brake motor. A locking block is also provided on the housing, and the locking block is connected to the housing via an adjustment component. The locking block can support the push rod through the adjustment component, thereby reducing the load on the lead screw.

[0006] Optionally, the protective assembly includes a rotating cylinder, which is fixedly connected to a rotating shaft. A round rod and a guide rod are movably inserted into the rotating cylinder. A first disc is fixedly connected between the other ends of the round rod and the guide rod. A first spring is movably sleeved on the outer surface of the round rod. The two ends of the first spring are respectively fixedly connected to the rotating cylinder and the first disc. A second disc is fixedly connected to the lead screw. A protrusion is fixedly installed on the first disc. A groove adapted to the protrusion is formed on the second disc.

[0007] Optionally, the push rod has a slot, the adjustment assembly includes a limiting plate, the limiting plate is fixedly installed on the housing, a square plate is movably inserted into the limiting plate, a horizontal plate is fixedly connected to the square plate, a circular groove is provided on the horizontal plate, and the locking block is movably sleeved on the outer surface of the horizontal plate.

[0008] Optionally, a collar is rotatably connected to the outer surface of the housing, and the collar is threadedly connected to the square plate.

[0009] Optionally, a pin is movably inserted into the card block, one end of the pin extends into the circular groove, and the other end of the pin is fixedly connected to a pull handle.

[0010] Optionally, a second spring is movably sleeved on the outer surface of the pin, and the two ends of the second spring are respectively fixedly connected to the locking block and the pull handle.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] This invention, by incorporating a locking block, a protective component, and an adjusting component, allows the rotating shaft to drive the lead screw through the protective component after the brake motor is running. This enables the slider to move the push rod and push-pull block along the axial direction of the lead screw. When the push-pull block encounters excessive resistance while pushing or pulling an item, the rotating shaft automatically disconnects from the lead screw through the protective component, thus preventing the brake motor from burning out. Furthermore, the operator can use the adjusting component to engage the locking block with the push rod, providing support and distributing the load on the lead screw. This prevents the lead screw from slipping due to excessive load, achieving overload protection and preventing the brake motor from burning out due to excessive load. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0014] Figure 1 This is a structural schematic diagram provided by this utility model.

[0015] Figure 2 This is a schematic diagram of the internal cross-sectional structure provided by this utility model.

[0016] Figure 3 This is a schematic diagram of the separation structure of the first disk and the second disk provided by this utility model.

[0017] Figure 4This is a schematic diagram of the installation structure of the first disc provided by this utility model.

[0018] Figure 5 This is a schematic diagram of the installation structure of the card block provided by this utility model.

[0019] Figure 6 This is a schematic diagram of the internal cross-sectional structure of the horizontal plate and collar provided by this utility model.

[0020] In the diagram: 1. Housing; 2. Brake motor; 3. Rotating shaft; 4. Lead screw; 5. Slider; 6. Push rod; 7. Push-pull block; 8. Locking block; 9. Rotating cylinder; 10. Round rod; 11. First disc; 12. Guide rod; 13. First spring; 14. Protrusion; 15. Second disc; 16. Groove; 17. Locking slot; 18. Limiting plate; 19. Square plate; 20. Horizontal plate; 21. Circular groove; 22. Collar; 23. Pin; 24. Pull handle; 25. Second spring. Detailed Implementation

[0021] 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.

[0022] like Figures 1 to 6 As shown in the figure, the linear push rod device with overload protection provided by this utility model includes a housing 1, a brake motor 2 fixedly mounted on the housing 1, the output shaft of the brake motor 2 connected to a rotating shaft 3 via a coupling, a lead screw 4 rotatably connected inside the housing 1, a slider 5 threaded onto the lead screw 4, a push rod 6 fixedly connected to the slider 5, and a push-pull block 7 fixedly connected to the other end of the push rod 6. The rotating shaft 3 and the lead screw 4 are connected by a protective component, which can prevent the rotating shaft 3 from being overloaded and damaging the brake motor 2. A locking block 8 is also provided on the housing 1, and the locking block 8 is connected to the housing 1 via an adjustment component. The locking block 8 can support the push rod 6 through the adjustment component, thereby reducing the load on the lead screw 4.

[0023] When in use, after the brake motor 2 is running, the rotating shaft 3 can drive the lead screw 4 to rotate through the protective component, so that the slider 5 can drive the push rod 6 and the push-pull block 7 to move along the axial direction of the lead screw 4. When the push-pull block 7 encounters too much resistance when pushing or pulling an item, the rotating shaft 3 can automatically disconnect from the lead screw 4 through the protective component, thereby preventing the brake motor 2 from being burned out. The operator can also use the adjustment component to attach the locking block 8 to the push rod 6, so that the locking block 8 supports the push rod 6, thereby distributing the load of the lead screw 4 and preventing the lead screw 4 from being overloaded and slipping.

[0024] Furthermore, the protective assembly includes a rotating cylinder 9, which is fixedly connected to the rotating shaft 3. A round rod 10 and a guide rod 12 are movably inserted into the rotating cylinder 9. A first disc 11 is fixedly connected between the other ends of the round rod 10 and the guide rod 12. A first spring 13 is movably sleeved on the outer surface of the round rod 10. The two ends of the first spring 13 are respectively fixedly connected to the rotating cylinder 9 and the first disc 11. A second disc 15 is fixedly connected to the lead screw 4. A protrusion 14 is fixedly installed on the first disc 11. A groove 16 that matches the protrusion 14 is opened on the second disc 15.

[0025] The preload of the first spring 13 is set to an overload protection threshold. By setting the first spring 13 to a compressed state, the elastic force of the first spring 13 will cause the first disc 11 to abut against the second disc 15, thereby causing the protrusion 14 to engage inside the groove 16. When the rotating shaft 3 rotates, the static friction torque between the protrusion 14 and the groove 16 can transmit power to the lead screw 4, causing the lead screw 4 to rotate. When the resistance of the push-pull block 7 exceeds the threshold set by the first spring 13, the torque that the rotating cylinder 9 needs to transmit exceeds the static friction torque between the protrusion 14 and the groove 16. At this time, the rotating cylinder 9 drives the first disc 11 to rotate, causing the protrusion 14 to slide out from inside the groove 16, and the first spring 13 is compressed. This achieves the effect that the rotating shaft 3 and the rotating cylinder 9 continue to rotate while the lead screw 4 stops rotating, preventing the rotating shaft 3 from jamming and burning out the brake motor 2.

[0026] Furthermore, the push rod 6 has a slot 17, and the adjustment assembly includes a limiting plate 18. The limiting plate 18 is fixedly installed on the housing 1. A square plate 19 is movably inserted into the limiting plate 18. A horizontal plate 20 is fixedly connected to the square plate 19. A circular groove 21 is provided on the horizontal plate 20. The locking block 8 is movably sleeved on the outer surface of the horizontal plate 20.

[0027] When the resistance of the push-pull block 7 is too great, triggering the overload protection and cutting off the power of the lead screw 4, the push rod 6 is stationary. The resistance of the push-pull block 7 is transmitted to the lead screw 4 through the push rod 6. At this time, the operator can slide the locking block 8 so that both ends of the locking block 8 are locked inside the locking groove 17, thereby supporting the push rod 6 and sharing the load of the lead screw 4, thus providing good protection for the lead screw 4.

[0028] Furthermore, a collar 22 is rotatably connected to the outer surface of the housing 1, and the collar 22 is threadedly connected to the square plate 19.

[0029] The position of the square plate 19 and the horizontal plate 20 can be adjusted by rotating the collar 22, thereby fine-tuning the position of the locking block 8 so that its two ends can smoothly lock into the slot 17 after sliding.

[0030] Furthermore, a pin 23 is movably inserted into the card block 8, one end of the pin 23 extends into the inside of the circular groove 21, and the other end of the pin 23 is fixedly connected to a pull handle 24.

[0031] When the push rod 6 extends or retracts normally, the pin 23 is locked inside the circular groove 21, which can limit the locking block 8 and prevent the locking block 8 from accidentally getting stuck inside the slot 17 and affecting the extension or retraction of the push rod 6.

[0032] Furthermore, a second spring 25 is movably sleeved on the outer surface of the pin 23, and the two ends of the second spring 25 are respectively fixedly connected to the locking block 8 and the pull handle 24.

[0033] By setting the second spring 25 to a stretched state, the elastic recovery effect of the second spring 25 will cause the pin 23 to tend to move into the circular groove 21, thereby stably maintaining the limiting effect on the locking block 8.

[0034] Working principle and usage process of this utility model:

[0035] In operation, after the brake motor 2 runs, the rotating shaft 3 drives the rotating cylinder 9 and the first disc 11 to rotate. The static friction torque between the protrusion 14 and the groove 16 transmits power to the lead screw 4, causing the lead screw 4 to rotate. This allows the slider 5 to drive the push rod 6 and the push-pull block 7 to move along the axial direction of the lead screw 4. When the resistance experienced by the push-pull block 7 exceeds the threshold set by the first spring 13, the torque that the rotating cylinder 9 needs to transmit exceeds the static friction torque between the protrusion 14 and the groove 16. At this point, the rotating cylinder 9 drives the first disc 11 to rotate, causing the protrusion 14 to slide out of the groove 16, compressing the first spring 13. This allows the rotating shaft 3 and the rotating cylinder 9 to continue rotating while the lead screw 4 continues to move. The effect of stopping the rotation of rod 4 prevents the shaft 3 from jamming and burning out the brake motor 2. Then, the operator can rotate the collar 22 to adjust the locking block 8 to a suitable position so that both ends of the locking block 8 can be locked into the slot 17. Then, pull the handle 24 to pull the pin 23 out of the round groove 21 and move the locking block 8 to lock it into the slot 17, thereby supporting the push rod 6 and sharing the load of the lead screw 4, thus providing good protection for the lead screw 4. When the load on the push-pull block 7 needs to be removed, the operator first returns the locking block 8 to its original position to release the support of the push rod 6, and then removes the load on the push-pull block 7. At this time, the power transmission is restored, and the push rod 6 continues to move normally.

[0036] The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A linear push rod device with overload protection, comprising a housing (1), a brake motor (2) fixedly mounted on the housing (1), the output shaft of the brake motor (2) being connected to a rotating shaft (3) via a coupling, a lead screw (4) rotatably connected inside the housing (1), a slider (5) threaded onto the lead screw (4), a push rod (6) fixedly connected to the slider (5), and a push-pull block (7) fixedly connected to the other end of the push rod (6), characterized in that: The rotating shaft (3) and the lead screw (4) are connected by a protective component. The protective component can prevent the rotating shaft (3) from being overloaded and damaging the brake motor (2). The housing (1) is also provided with a locking block (8). The locking block (8) is connected to the housing (1) by an adjustment component. The locking block (8) can support the push rod (6) through the adjustment component, thereby reducing the load on the lead screw (4).

2. The linear actuator with overload protection according to claim 1, characterized in that: The protective assembly includes a rotating cylinder (9), which is fixedly connected to a rotating shaft (3). A round rod (10) and a guide rod (12) are movably inserted into the rotating cylinder (9). A first disc (11) is fixedly connected between the other ends of the round rod (10) and the guide rod (12). A first spring (13) is movably sleeved on the outer surface of the round rod (10). The two ends of the first spring (13) are fixedly connected to the rotating cylinder (9) and the first disc (11) respectively. A second disc (15) is fixedly connected to the lead screw (4). A protrusion (14) is fixedly installed on the first disc (11). A groove (16) adapted to the protrusion (14) is opened on the second disc (15).

3. A linear actuator with overload protection according to claim 1, characterized in that: The push rod (6) has a slot (17), the adjustment component includes a limiting plate (18), the limiting plate (18) is fixedly installed on the housing (1), a square plate (19) is movably inserted into the limiting plate (18), a horizontal plate (20) is fixedly connected to the square plate (19), a circular groove (21) is opened on the horizontal plate (20), and the locking block (8) is movably sleeved on the outer surface of the horizontal plate (20).

4. A linear actuator with overload protection according to claim 1, characterized in that: The outer surface of the housing (1) is rotatably connected to a collar (22), and the collar (22) is threadedly connected to the square plate (19).

5. A linear actuator with overload protection according to claim 1, characterized in that: A pin (23) is movably inserted into the card block (8). One end of the pin (23) extends into the circular groove (21), and the other end of the pin (23) is fixedly connected to a pull handle (24).

6. A linear actuator with overload protection according to claim 5, characterized in that: The outer surface of the pin (23) is movably sleeved with a second spring (25), and the two ends of the second spring (25) are respectively fixedly connected to the locking block (8) and the pull handle (24).

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