Lifting mechanism with self-locking device

Abstract

The utility model belongs to mechanical drive and locking technical field especially relates to a lifting mechanism with self -locking device, include: lifting assembly, have fixed end and movable end, the fixed end and movable end of lifting assembly are provided between gear and rack lifting assembly, gear and rack lifting assembly is used for making the movable end of lifting assembly relative movable end fixed end moves, worm gear drive spare, the input of worm gear drive spare is set on the fixed end of lifting assembly with gear and rack lifting assembly's input transmission connection, friction self -locking assembly is set between the fixed end of lifting assembly and the input of worm gear drive spare, friction self -locking assembly is used for increasing the friction between the fixed end of lifting assembly and the input of worm gear drive spare. The device can significantly improve the locking ability of the movable end of lifting assembly, and then prolong the service life, improve the lifting precision.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical transmission and locking technology, and in particular relates to a lifting mechanism with a self-locking device. Background Technology

[0002] In fields such as precision instruments, medical equipment, and industrial automation, the stability and reliability of lifting mechanisms are crucial. The core requirement is the ability to effectively lock at the target position to prevent load slippage or drift. While existing self-locking technologies provide basic locking functionality, they fall short of meeting the ever-increasing demands for intelligent, high-precision, and high-reliability operations.

[0003] With prolonged use, the locking force of traditional self-locking technology decreases due to wear on the working surface. When dealing with heavy loads, the platform may sink, leading to positioning failure. This fails to meet the fundamental requirements for precise positioning in applications such as precision instruments and optical focusing. Furthermore, when the working surface is worn, performance can only be restored by replacing parts, resulting in high maintenance costs and a short equipment lifespan.

[0004] Based on the aforementioned deficiencies in the existing technology, this utility model proposes a lifting mechanism with a self-locking device to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a lifting mechanism with a self-locking device to solve the above-mentioned problems.

[0006] To achieve the above objectives, this utility model provides the following solution:

[0007] A lifting mechanism with a self-locking device includes:

[0008] A lifting assembly has a fixed end and a movable end. A rack and pinion lifting assembly is provided between the fixed end and the movable end of the lifting assembly. The rack and pinion lifting assembly is used to move the movable end of the lifting assembly relative to the fixed end of the movable end.

[0009] The worm gear transmission component has its output end connected to the input end of the gear and rack lifting assembly, and the input end of the worm gear transmission component is located on the fixed end of the lifting assembly.

[0010] A friction self-locking component is disposed between the fixed end of the lifting component and the input end of the worm gear transmission component. The friction self-locking component is used to increase the frictional force between the fixed end of the lifting component and the input end of the worm gear transmission component.

[0011] Optionally, the fixed end of the lifting assembly includes a housing, and both the worm gear and the worm wheel are rotatably disposed within the housing.

[0012] Optionally, the movable end of the lifting assembly includes a lifting member and a lifting platform, the lifting member being fixed to the lifting platform, and the lifting member being vertically slidably disposed within the housing.

[0013] Optionally, the friction self-locking assembly includes:

[0014] The protective cover is fixedly connected to the outer shell;

[0015] A sealing cap is axially connected to one side of the protective cover;

[0016] A wedge-shaped friction block is coaxially slidably disposed inside the protective cover. A friction groove is provided inside the wedge-shaped friction block, and a friction protrusion is provided in the middle of the worm. The friction groove matches the friction protrusion, and a friction pair is formed between the friction groove and the friction protrusion.

[0017] An adjusting extrusion part is disposed inside the protective cover and on the side away from the friction groove. The adjusting extrusion part is used to adjust the friction force of the friction groove on the friction protrusion.

[0018] A rebound portion is disposed on one side of the friction groove, and the rebound portion is used to move the friction groove away from the friction protrusion.

[0019] Optionally, the rebound part includes a plurality of small springs, which are circumferentially and equally spaced on the outside of the friction groove;

[0020] One end of the small spring abuts against the wedge-shaped friction block, and the other end of the small spring abuts against the inner wall of the protective cover.

[0021] Optionally, the elastic force of some of the smaller springs is less than that of the larger spring.

[0022] Compared with the prior art, the present invention has the following advantages and technical effects:

[0023] In use, the friction self-locking component increases the friction between the fixed end of the lifting assembly and the input end of the worm gear drive, thereby preventing the input end of the worm gear drive from rotating on its own. This, combined with the self-locking characteristic of the worm gear drive itself, locks the moving end of the lifting assembly. Furthermore, when the worm gear drive experiences internal wear, resulting in play under high loads, the friction self-locking component increases the friction between the fixed end of the lifting assembly and the input end of the worm gear drive, preventing the input end of the worm gear drive from rotating on its own. This significantly improves the locking capability of the moving end of the lifting assembly, thus extending its service life and improving lifting accuracy. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of this utility model;

[0026] Figure 2 This is a schematic diagram of the gear and rack lifting assembly of this utility model;

[0027] Figure 3 This is a schematic diagram of the outer shell structure of this utility model;

[0028] Figure 4 This is a schematic diagram of the worm gear transmission component of this utility model;

[0029] Figure 5 This is a cross-sectional view of the friction self-locking component of this utility model;

[0030] Among them, 100 is the gear and rack lifting assembly; 200 is the handwheel; 300 is the adjusting knob; 400 is the friction self-locking assembly; 500 is the outer shell; 600 is the worm gear transmission component; 101 is the gear; 102 is the shaft; 103 is the lifting platform; 104 is the lifting component; 401 is the sealing cover; 402 is the protective cover; 403 is the large spring; 404 is the wedge-shaped friction block; 405 is the small spring; 601 is the worm; and 602 is the worm wheel. Detailed Implementation

[0031] 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.

[0032] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Reference Figures 1 to 5 This utility model discloses a lifting mechanism with a self-locking device, comprising:

[0034] A lifting assembly has a fixed end and a movable end. A rack and pinion lifting assembly 100 is provided between the fixed end and the movable end of the lifting assembly. The rack and pinion lifting assembly 100 is used to move the movable end of the lifting assembly relative to the fixed end of the movable end.

[0035] The worm gear transmission component 600 has its output end connected to the input end of the gear and rack lifting assembly 100. The input end of the worm gear transmission component 600 is located on the fixed end of the lifting assembly.

[0036] The friction self-locking component 400 is disposed between the fixed end of the lifting component and the input end of the worm gear transmission component 600. The friction self-locking component 400 is used to increase the friction between the fixed end of the lifting component and the input end of the worm gear transmission component 600.

[0037] In use, the friction self-locking component 400 increases the friction between the fixed end of the lifting component and the input end of the worm gear transmission component 600, thereby preventing the input end of the worm gear transmission component 600 from rotating on its own. This, together with the self-locking characteristic of the worm gear transmission component 600 itself, achieves the locking of the moving end of the lifting component. Furthermore, when the worm gear transmission component 600 experiences internal wear, resulting in play under high load conditions, the friction self-locking component 400 increases the friction between the fixed end of the lifting component and the input end of the worm gear transmission component 600, preventing the input end of the worm gear transmission component 600 from rotating on its own. This significantly improves the locking capability of the moving end of the lifting component, thereby extending its service life and improving lifting accuracy.

[0038] As an optional implementation, the worm gear transmission component 600 includes a worm 601 and a worm wheel 602, with the worm 601 meshing with the worm wheel 602, and both the worm 601 and the worm wheel 602 being rotatably disposed within the fixed end of the lifting assembly.

[0039] As an optional implementation, the fixed end of the lifting assembly includes a housing 500, and the worm gear 601 and worm wheel 602 are rotatably disposed within the housing 500.

[0040] As an alternative implementation, a handwheel 200 is axially connected to one end of the worm gear 601, and the handwheel 200 is located on the outside of the housing 500.

[0041] The outer casing 500 forms the main support and protection structure of the device, and its bottom is provided with a base for overall installation and fixation.

[0042] The worm gear transmission component 600 includes a worm 601 and a worm wheel 602. The worm 601 is horizontally positioned, with its left end fixedly connected to the handwheel 200 via a flat key, and its right end extending out of the housing 500 and rotatably supported on the left side wall of the housing 500 via a first deep groove ball bearing. The worm wheel 602 is rotatably mounted inside the housing 500 and precisely meshes with the worm 601, forming a worm gear transmission pair with reverse self-locking characteristics.

[0043] As an optional implementation, the movable end of the lifting assembly includes a lifting member 104 and a lifting platform 103. The lifting member 104 is fixed to the lifting platform 103, and the lifting member 104 is vertically slidably disposed within the housing 500.

[0044] As an optional implementation, the gear and rack lifting assembly 100 includes a gear 101, a shaft 102 and a rack disposed on one side of the lifting member 104. The gear 101 meshes with the rack, and the gear 101 is rotatably disposed in the housing 500 via the shaft 102. The gear 101 is also axially connected to the worm gear 602.

[0045] The lifting component 104 is a vertical guide rod with a square cross-section, which can slide up and down in a linear bearing located inside the housing 500. A rack is provided on one side of the lifting component 104, and a gear 101 meshes with the rack on the lifting component 104, forming a rack and pinion lifting pair that converts rotary motion into linear motion. Dustproof rings and corrugated protective covers are provided at the extension points of the lifting component 104 and the housing 500 to prevent dust and foreign objects from entering the mechanism and affecting transmission accuracy and service life. The lifting platform 103 is welded and fixed to the top of the lifting component 104 and is used to support workpieces or loads.

[0046] As an optional implementation, the friction self-locking assembly 400 includes:

[0047] Protective cover 402 is fixedly connected to outer casing 500;

[0048] The sealing cover 401 is axially connected to one side of the protective cover 402;

[0049] A wedge-shaped friction block 404 is coaxially slidably disposed inside a protective cover 402. A friction groove is provided inside the wedge-shaped friction block 404, and a friction protrusion is provided in the middle of the worm 601. The friction groove and the friction protrusion match each other, and a friction pair is formed between the friction groove and the friction protrusion.

[0050] The adjusting extrusion part is located inside the protective cover 402 and on the side away from the friction groove. The adjusting extrusion part is used to adjust the friction force of the friction groove on the friction protrusion.

[0051] The rebound section is located on one side of the friction groove and is used to keep the friction groove away from the friction protrusion.

[0052] As an optional implementation, the adjusting compression part includes a large spring 403. One end of the large spring 403 abuts against one side of the wedge-shaped friction block 404, and the other end of the large spring 403 passes through the sealing cover 401 and abuts against the side of the adjusting knob 300. The adjusting knob 300 is threadedly engaged with the worm gear 601.

[0053] As an optional implementation, the rebound part includes a plurality of small springs 405, which are circumferentially and equally spaced on the outside of the friction groove.

[0054] One end of the small spring 405 abuts against the wedge-shaped friction block 404, and the other end of the small spring 405 abuts against the inner wall of the protective cover 402.

[0055] As an alternative implementation, the elastic force of several small springs 405 is less than that of the large spring 403.

[0056] The friction self-locking assembly 400 includes a sealing cover 401, a protective cover 402, a large spring 403, a wedge-shaped friction block 404, and a small spring 405.

[0057] The adjusting knob 300 is sleeved on the worm 601 and located inside the handwheel 200. The inner hole of the adjusting knob 300 is machined with internal threads, which together with a section of external threads machined on the worm 601 form a threaded pair.

[0058] The wedge-shaped friction block 404 is axially slidably fitted onto the optical axis portion of the worm gear 601, with the right side being an inclined surface. A large spring 403 is fitted onto the wedge-shaped friction block 404, with one end abutting against the inner end face of the adjusting knob 300 and the other end abutting against the right side plane of the wedge-shaped friction block 404.

[0059] Rotating the adjustment knob 300 can drive it to move axially along the worm 601, thereby compressing or releasing the large spring 403, which in turn pushes the wedge-shaped friction block 404 so that its friction groove abuts or separates from the friction protrusion, so as to dynamically adjust the friction torque acting on the worm 601. When loosening, the small spring 405 resets and pushes the wedge-shaped friction block 404 back to its original position.

[0060] Gear 101 and worm gear 602 are coaxially fixedly connected by set screws and rotate synchronously with worm gear 602.

[0061] Its working principle is as follows: The operator turns the handwheel 200, and the power is transmitted to the gear 101 through the worm gear 601 and worm wheel 602, driving the lifting component 104 to move vertically up and down, thereby moving the lifting platform 103 to the target working position. When locking is required, the adjustment knob 300 is rotated according to the load size, compressing the large spring 403, causing the wedge-shaped friction block 404 to press against the mating inclined surface, generating a huge frictional torque. This frictional torque, combined with the inherent self-locking torque of the worm gear, jointly resists the downward force of the load, achieving reliable, stepless locking at any position. This locking force can be dynamically adjusted and can be compensated for after wear, ensuring the long-term reliability and stability of the device.

[0062] As can be seen from the above embodiments, the lifting mechanism with a self-locking device provided by this utility model has the following beneficial effects:

[0063] This invention eliminates the need for parts replacement after the wedge-shaped friction block wears down due to prolonged use. The user simply rotates the adjustment knob 300 to further compress the large spring 403, automatically compensating for the gap and pressure loss caused by wear, and quickly restoring the locking force to its initial level. This feature significantly extends the device's service life. Furthermore, the device's dustproof design reduces maintenance costs and ensures reliability throughout its entire lifespan. The entire device is compact, highly integrated, easy to operate, and features a user-friendly interface.

[0064] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0065] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Any modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A lifting mechanism with a self-locking device, characterized in that, include: A lifting assembly has a fixed end and a movable end. A rack and pinion lifting assembly (100) is provided between the fixed end and the movable end of the lifting assembly. The rack and pinion lifting assembly (100) is used to move the movable end of the lifting assembly relative to the fixed end of the movable end. The worm gear transmission component (600) has its output end connected to the input end of the gear and rack lifting assembly (100), and the input end of the worm gear transmission component (600) is located on the fixed end of the lifting assembly. A friction self-locking assembly (400) is disposed between the fixed end of the lifting assembly and the input end of the worm gear transmission component (600). The friction self-locking assembly (400) is used to increase the frictional force between the fixed end of the lifting assembly and the input end of the worm gear transmission component (600).

2. A lifting mechanism with a self-locking device according to claim 1, characterized in that, The worm gear transmission component (600) includes a worm (601) and a worm wheel (602), wherein the worm (601) meshes with the worm wheel (602), and both the worm (601) and the worm wheel (602) are rotatably disposed within the fixed end of the lifting assembly.

3. A lifting mechanism with a self-locking device according to claim 2, characterized in that, The fixed end of the lifting assembly includes a housing (500), and the worm (601) and the worm wheel (602) are rotatably disposed within the housing (500).

4. A lifting mechanism with a self-locking device according to claim 3, characterized in that: One end of the worm gear (601) is axially connected to a handwheel (200), which is located on the outside of the housing (500).

5. A lifting mechanism with a self-locking device according to claim 3, characterized in that, The movable end of the lifting assembly includes a lifting component (104) and a lifting platform (103). The lifting component (104) is fixed to the lifting platform (103), and the lifting component (104) is vertically slidably disposed within the outer casing (500).

6. A lifting mechanism with a self-locking device according to claim 5, characterized in that, The gear and rack lifting assembly (100) includes a gear (101), a shaft (102), and a rack disposed on one side of the lifting member (104). The gear (101) meshes with the rack. The gear (101) is rotatably disposed in the housing (500) through the shaft (102), and the gear (101) is shaft-connected to the worm gear (602).

7. A lifting mechanism with a self-locking device according to claim 3, characterized in that, The friction self-locking assembly (400) includes: The protective cover (402) is fixedly connected to the outer shell (500); A sealing cover (401) is axially connected to one side of the protective cover (402); A wedge-shaped friction block (404) is coaxially slidably disposed inside the protective cover (402). A friction groove is provided inside the wedge-shaped friction block (404), and a friction protrusion is provided in the middle of the worm (601). The friction groove matches the friction protrusion, and a friction pair is formed between the friction groove and the friction protrusion. An adjusting extrusion part is provided inside the protective cover (402) and on the side away from the friction groove. The adjusting extrusion part is used to adjust the friction force of the friction groove on the friction protrusion. A rebound portion is disposed on one side of the friction groove, and the rebound portion is used to move the friction groove away from the friction protrusion.

8. A lifting mechanism with a self-locking device according to claim 7, characterized in that: The adjusting compression part includes a large spring (403), one end of which abuts against one side of the wedge-shaped friction block (404), and the other end of which passes through the sealing cover (401) and abuts against one side of the adjusting knob (300), which is threadedly engaged with the worm gear (601).

9. A lifting mechanism with a self-locking device according to claim 8, characterized in that: The rebound part includes a plurality of small springs (405), and the plurality of small springs (405) are circumferentially and equally spaced on the outside of the friction groove; One end of the small spring (405) abuts against the wedge-shaped friction block (404), and the other end of the small spring (405) abuts against the inner wall of the protective cover (402).

10. A lifting mechanism with a self-locking device according to claim 9, characterized in that: The elastic force of several of the small springs (405) is smaller than that of the large spring (403).

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