A lifting mechanism

Abstract

The utility model discloses a kind of lifting mechanism, driving member provides power, and power is transmitted to screw rod by transmission member, so that screw rod rotates relative to fixed support, so that nut moves along the axial movement of screw rod, to drive the linear motion of external device installed on nut.When nut moves to the position opposite to lock block, when the elastic limit piece on nut can be limited in limit groove, the axial movement of nut along screw rod can be limited, at this time, nut has self-locking, can avoid vibration or artificial pressure leading to external device on nut counter-drive, so as to cause functional failure;When descending or retracting, elastic limit piece can be removed from limit groove, i.e. it can be unlocked, at this time, it can be normally descended.

Description

Technical Field

[0001] This utility model relates to the field of miniature lifting, specifically to a lifting mechanism. Background Technology

[0002] Existing self-locking miniature lifting mechanisms often use single-start lead screws. While meeting customer thrust requirements, single-start lead screws have a small lead and slow speed, which cannot meet customer speed requirements. To solve this problem, single-start lead screws can be replaced with multi-start lead screws. Multi-start lead screws have a large lead and fast speed, but they lack self-locking properties. Slight vibrations or human touch can cause reverse drive, causing the vertical position of the lifted object to change and reducing positioning accuracy. Utility Model Content

[0003] In order to overcome the shortcomings of the prior art, this utility model provides a lifting mechanism that can solve the problem of the lack of self-locking in existing lifting mechanisms with large lead and high speed.

[0004] The technical solution adopted by this utility model to solve its technical problem is as follows: A lifting mechanism is provided, including a fixed bracket, a driving component, a transmission component, a guide rod, and a lead screw. The lead screw includes a screw rod and a nut. The screw rod is rotatably mounted on the fixed bracket, and an external device is mounted on the nut. The driving component provides torque, and the transmission component transmits the torque to the screw rod to drive it to rotate. The guide rod is fixedly mounted on the fixed bracket and is parallel to the screw rod. The nut is slidably connected to the guide rod. A locking block is provided on the fixed bracket, and the locking block is opposite to the screw rod. A limiting groove is provided on the side of the locking block facing the screw rod. An elastic limiting member is provided on the nut, and the elastic limiting member is used to elastically limit the nut within the limiting groove.

[0005] As a further improvement to the above technical solution, the elastic limiting member includes a spring ball and a compression spring. The spring ball is connected to one end of the compression spring, and the axial direction of the compression spring is the same as the arrangement direction of the locking block and the screw.

[0006] As a further improvement to the above technical solution, the nut is provided with a receiving groove on the side facing the locking block, the spring ball and the compression spring are both located in the receiving groove, a limit cover is provided at the opening of the receiving groove, a guide channel is provided on the limit cover, the spring ball is fitted into the guide channel with a clearance, and the outer port diameter of the guide channel is smaller than the diameter of the spring ball.

[0007] As a further improvement to the above technical solution, an arc-shaped protrusion is provided below the limiting groove.

[0008] As a further improvement to the above technical solution, the screw is rotatably connected to the fixed bracket via a bearing.

[0009] As a further improvement to the above technical solution, two bearings are provided, with the two bearings located at both ends of the screw respectively.

[0010] As a further improvement to the above technical solution, the driving component includes a motor, the stator of the motor is mounted on the fixed bracket, the rotor of the motor is connected to motor teeth, and the transmission component includes a gear set, the input end of the gear set is connected to the motor teeth, and the output end of the gear set is connected to the screw.

[0011] As a further improvement to the above technical solution, the gear set includes a first gear, a second gear, and a third gear that mesh in sequence. The first gear meshes with the motor teeth, and the third gear is fixedly connected to the screw.

[0012] As a further improvement to the above technical solution, both the first gear and the second gear are double-toothed.

[0013] As a further improvement to the above technical solution, the center of the third gear is provided with a flat hole, and one end of the screw is provided with a flat shaft section, which is interference-fitted into the flat hole.

[0014] The beneficial effects of this utility model are as follows: the driving component provides power and transmits the power to the screw through the transmission component, causing the screw to rotate relative to the fixed bracket, thereby causing the nut to move along the axial direction of the screw, thus driving the external device mounted on the nut to make linear motion. When the nut moves to the position opposite to the locking block, the elastic limiting component on the nut can be confined within the limiting groove, which can restrict the nut's axial movement along the screw. At this time, the nut has self-locking properties, which can prevent vibration or artificial pressure from causing the external device on the nut to reverse drive, thereby causing functional failure. When descending or retracting, the elastic limiting component can be moved out of the limiting groove, which unlocks the device, allowing normal descent. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a schematic diagram of the lifting mechanism provided in a preferred embodiment of the present invention; Figure 2 This is a cross-sectional view of the lifting mechanism provided in a preferred embodiment of the present invention; Figure 3 This is a schematic diagram of the lead screw and guide rod provided in a preferred embodiment of the present invention; Figure 4This is a partial structural schematic diagram of the lifting mechanism provided in a preferred embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the lock block provided in a preferred embodiment of the present invention.

[0017] Reference numerals: 1. Fixing frame; 2. Driving component; 3. Transmission component; 4. Lead screw; 5. Guide rod; Lock block, 21, motor, 31, gear set, 41, screw, 42, nut; 111. Limiting groove; 112. Arc-shaped protrusion; 211. Motor tooth; 311. First gear; 312. Second gear; 313. Third gear; 314. Flat hole; 411. Bearing; 412. Flat shaft section; 421. Elastic limiting element; 422. Spring ball; 423. Compression spring; 424. Receiving groove; 425. Limiting cover; 426. Guide channel. Detailed Implementation

[0018] The following will clearly and completely describe the concept, specific structure, and technical effects of this utility model in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the scope of protection of this utility model. Furthermore, all connections / connections involved in the patent do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. For example, fixed connections / fixed installations can use screw connections, bolt connections, pin connections, key connections, adhesive connections, mortise and tenon connections, welding, riveting, etc., as needed. For detachable connections, screw connections, bolt connections, threaded connections, snap-fit ​​connections, mortise and tenon connections, Velcro connections, etc., can be used as needed. The various technical features in this utility model can be combined interactively without contradicting each other.

[0019] Please see Figure 1-5This utility model provides a lifting mechanism in a preferred embodiment, including a fixed bracket 1, a driving component 2, a transmission component 3, a lead screw 4, and a guide rod 5. The lead screw 4 includes a screw 41 and a nut 42. The screw 41 is rotatably mounted on the fixed bracket 1, and the guide rod 5 is fixedly mounted on the fixed bracket 1 and is arranged parallel to the screw 41. The nut 42 is slidably connected to the guide rod 5, and an external device is mounted on the nut 42. The driving component 2 is used to provide torque, and the transmission component 3 is used to transmit torque to the screw 41 to drive the screw 41 to rotate relative to the fixed bracket 1, thereby causing the nut 42 to move along the axial direction of the screw 41, so as to drive the external device mounted on the nut 42 to make linear motion. The guide rod 5 can further limit the movement path of the nut 42 and improve the stability of the movement of the nut 42. The lead screw 4 is a multi-start lead screw with a large lead and high speed, and high transmission efficiency.

[0020] Specifically, the fixed bracket 1 is provided with a locking block 11, which is positioned opposite to the screw 41. A limiting groove 111 is provided on the side of the locking block 11 facing the screw 41. The nut 42 is provided with an elastic limiting member 421, which is used to elastically limit the nut 42 within the limiting groove 111. When the nut 42 moves to a position opposite to the locking block 11, the elastic limiting member 421 on the nut 42 can be limited within the limiting groove 111, thus restricting the nut 42 from moving axially along the screw 41. At this time, the nut 42 has self-locking properties, preventing vibration or artificial pressure from causing the external device on the nut 42 to reverse drive, thereby causing functional failure. When descending or retracting, the elastic limiting member 421 can be removed from the limiting groove 111, unlocking the nut and allowing normal descent.

[0021] In this embodiment, the elastic limiting member 421 includes a spring ball 422 and a compression spring 423. One end of the spring ball 422 is connected to one end of the compression spring 423, and the axial direction of the compression spring 423 is the same as the arrangement direction of the locking block 11 and the screw 41. When the spring ball 422 abuts against the locking block 11, the compression spring 423 is compressed. When the spring ball 422 continues to move into the limiting groove 111, the compression spring 423 presses the spring ball 422 against the limiting groove 111, thereby preventing the nut 42 from moving along the axial direction of the screw 41.

[0022] In this embodiment, a receiving groove 424 is provided on the side of the nut 42 facing the locking block 11. The spring ball 422 and the compression spring 423 are both located in the receiving groove 424. A limit cover 425 is provided at the opening of the receiving groove 424. A guide channel 426 is provided on the limit cover 425. The spring ball 422 is fitted into the guide channel 426 with a clearance, and the outer diameter of the guide channel 426 is smaller than the diameter of the spring ball 422, so as to restrict the spring ball 422 within the guide channel 426. The arrangement of the receiving groove 424 and the guide channel 426 restricts the movement path of the spring ball 422 and the compression spring 423, so that the overall elastic force is oriented in the horizontal direction.

[0023] To facilitate the entry and exit of the spring ball 422 into and out of the limiting groove 111, an arc-shaped protrusion 112 is provided below the limiting groove 111. The arc-shaped protrusion 112 can reduce the resistance of the spring ball 422 entering and exiting the limiting groove 111, and the friction between the spring ball 422 and the arc-shaped protrusion 112 is small, so the two can transition smoothly.

[0024] The screw 41 is rotatably connected to the fixed bracket 1 via bearings 411. The bearings 411 support the rotation of the screw 41, reduce friction between the screw 41 and the fixed bracket 1, and ensure the rotational accuracy of the screw 41. In this embodiment, two bearings 411 are provided, located at both ends of the screw 41 respectively, to ensure that both ends of the screw 41 can rotate synchronously, keeping the screw 41 straight during rotation and ensuring concentricity and stability.

[0025] In this embodiment, the driving component 2 includes a motor 21, the stator of which is mounted on a fixed bracket 1, and the rotor of which is connected to motor teeth 211. The transmission component 3 includes a gear set 31, the input end of which is connected to the motor teeth 211, and the output end of which is connected to a screw 41. The rotor of the motor 21 drives the motor teeth 211 to rotate, and then transmits the power to the screw 41 through the gear set 31. The gear set 31 has high transmission efficiency, compact structure, and large power transmission capacity.

[0026] The gear set 31 includes a first gear 311, a second gear 312, and a third gear 313 that mesh in sequence. The first gear 311 meshes with the motor gear 211, and the third gear 313 is fixedly connected to the screw 41. The three-stage gear transmission is achieved through the first gear 311, the second gear 312, and the third gear 313 to increase the torque and achieve a larger transmission ratio, thereby improving the smoothness of the movement of the nut 42.

[0027] To make the space more compact, both the first gear 311 and the second gear 312 are double-toothed. The double-toothed gears can switch the two meshing gear pairs simultaneously through an axial sliding operation, thereby changing the two transmission ratios.

[0028] The third gear 313 has a flat hole 314 at its center, and the screw 41 has a flat shaft section 412 at one end. The flat shaft section 412 is interference-fitted into the flat hole 314. The circumferential fixation can be achieved through the cooperation of the flat hole 314 and the flat shaft section 412 to transmit torque. The structure is simple and easy to assemble.

[0029] The above is a detailed description of the preferred embodiments of the present utility model. However, the present utility model is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A lifting mechanism, characterized in that: The device includes a fixed bracket, a driving component, a transmission component, a guide rod, and a lead screw. The lead screw includes a screw thread and a nut. The screw thread is rotatably mounted on the fixed bracket, and an external device is mounted on the nut. The driving component provides torque, and the transmission component transmits the torque to the screw thread to drive it to rotate. The guide rod is fixedly mounted on the fixed bracket and is parallel to the screw thread. The nut is slidably connected to the guide rod. The fixed bracket has a locking block, which is positioned opposite to the screw thread. The locking block has a limit groove on the side facing the screw thread. The nut has an elastic limiting element, which elastically limits the nut to the limit groove.

2. The lifting mechanism according to claim 1, characterized in that: The elastic limiting component includes a spring ball and a compression spring. The spring ball is connected to one end of the compression spring, and the axial direction of the compression spring is the same as the arrangement direction of the locking block and the screw.

3. The lifting mechanism according to claim 2, characterized in that: The nut has a receiving groove on the side facing the locking block. The spring ball and the compression spring are both located in the receiving groove. A limit cover is provided at the opening of the receiving groove. A guide channel is provided on the limit cover. The spring ball is fitted into the guide channel with a clearance, and the outer diameter of the guide channel is smaller than the diameter of the spring ball.

4. The lifting mechanism according to claim 2, characterized in that: An arc-shaped protrusion is provided below the limiting groove.

5. The lifting mechanism according to claim 1, characterized in that: The screw is rotatably connected to the fixed bracket via a bearing.

6. The lifting mechanism according to claim 5, characterized in that: Two bearings are provided, and the two bearings are respectively located at both ends of the screw.

7. The lifting mechanism according to claim 1, characterized in that: The driving component includes a motor, the stator of which is mounted on the fixed bracket, and the rotor of which is connected to motor teeth. The transmission component includes a gear set, the input end of which is connected to the motor teeth, and the output end of which is connected to the screw.

8. The lifting mechanism according to claim 7, characterized in that: The gear set includes a first gear, a second gear, and a third gear that mesh in sequence. The first gear meshes with the motor teeth, and the third gear is fixedly connected to the screw.

9. The lifting mechanism according to claim 8, characterized in that: Both the first gear and the second gear are double-toothed.

10. The lifting mechanism according to claim 8, characterized in that: The third gear has a flat hole at its center, and one end of the screw has a flat shaft section, which is interference-fitted into the flat hole.

Images