Self-locking screw lifter
By combining the mechanical structure of the support arm and the support pad with the baffle limit design, the problem of self-locking failure of the spiral lift is solved, achieving high stability and precise adjustment, and improving the safety and service life of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANDONG RUNLONG MASCH TOOL CO LTD
- Filing Date
- 2025-08-06
- Publication Date
- 2026-06-09
Smart Images
Figure CN224337114U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of lifting device technology, specifically relating to a self-locking spiral lifting device. Background Technology
[0002] In the machining of large workpieces, clamping a variety of workpieces requires pads of different heights to match the clamping plates, screws, and T-nuts. The production of pads of different heights has brought difficulties to production costs and the uniformity and standardization of tooling. Especially when clamping workpieces with a height of more than 0.5 meters on a large T-slot workbench, it is difficult to match various pads of different heights. Therefore, the lifter, as a key piece of equipment for lifting and supporting heavy objects, is an indispensable tool in workpiece machining.
[0003] Among them, screw lifts are widely used in lifting small and medium-sized heavy objects due to their simple structure, low manufacturing cost, and lack of the need for an additional power source. However, existing screw lifts still have many limitations in actual use: for example, the self-locking performance of traditional screw lifts mainly relies on the friction of the threads. Under continuous pressure or vibration of heavy objects, they are prone to loosening, and self-locking failure can easily occur due to thread wear and uneven force, leading to the safety hazard of the heavy object accidentally sliding down.
[0004] Therefore, this utility model proposes a self-locking spiral lift to solve the above problems. Utility Model Content
[0005] This invention provides a self-locking spiral lift to solve at least one of the above-mentioned technical problems.
[0006] The technical solution adopted by this utility model is as follows: a self-locking spiral lifter, including a support cylinder with a hollow structure and a support rod sleeved inside the support cylinder. The top end of the support cylinder is connected to a support pad that covers the hollow structure. Multiple support arms are spaced apart on the support rod. The support arms have blocking parts and clearance parts that cooperate with the support pad. The support pad has a locking element.
[0007] In a preferred embodiment, the support arms are symmetrically arranged along the central axis of the support rod, and each group of support arms is evenly distributed along the axial direction of the support rod.
[0008] In a preferred embodiment, the inner wall of the support cylinder is provided with a plurality of baffles that cooperate with the support arm, so as to restrict and fix the position of the support rod by the cooperation of the baffles and the support arm.
[0009] In a preferred embodiment, the locking element is a protrusion provided on the support pad, and the protrusion is a crescent-shaped protrusion symmetrically arranged to cooperate with the support arm.
[0010] In a preferred embodiment, the locking element is a circular locking bead embedded in the support pad, and the blocking part has a semi-circular slot on the side facing the support pad that cooperates with the circular locking bead.
[0011] In a preferred embodiment, a movable groove is formed on the support pad, the locking member is a locking post that extends into the movable groove, and the blocking part has a locking groove on the side facing the support pad that cooperates with the locking post; a telescopic spring is provided between one side of the locking post and the bottom of the movable groove, and the other side of the locking post is a spherical contact surface.
[0012] In a preferred embodiment, the support cylinder is connected to a base on the side away from the support pad, and the base is provided with mounting holes and an anti-slip layer.
[0013] In a preferred embodiment, a sleeve is formed on the side of the support rod facing away from the base, and a fine-tuning screw is threaded onto the sleeve, with a support seat at the top of the fine-tuning screw.
[0014] In a preferred embodiment, both the outer surface of the support rod and the inner surface of the sleeve are provided with a wear-resistant coating.
[0015] Due to the adoption of the above technical solution, the beneficial effects achieved by this utility model are as follows:
[0016] 1. In a preferred embodiment of this utility model, a dynamic cooperation is formed between the support arm on the support rod and the support pad: the blocking part on the support arm can contact the support pad and transmit the supporting force, while the avoidance part is used to avoid the support pad during lifting, thus realizing the smooth movement of the support rod; the locking part on the support pad engages with the support arm at a specific position, further enhancing the locking effect and preventing the support rod from accidentally falling back under load. This structural design breaks away from the traditional screw lift's self-locking method that relies solely on thread friction, and improves the self-locking reliability and support stability through the rigid cooperation of the mechanical structure.
[0017] 2. As a preferred embodiment of this utility model, by symmetrically arranging the support arms along the central axis of the support rod and evenly distributing each group along the axial direction, the support stability and self-locking reliability of the lift are improved by utilizing symmetrical force balance and graded limiting cooperation. Furthermore, by selecting support arms at different height positions to cooperate with support pads, standardized and precise height adjustment can be achieved, thereby improving operational efficiency.
[0018] 3. As a preferred embodiment of this utility model, a "positioning" limiting structure is formed by the baffle on the inner wall of the support cylinder and the support arms that are axially evenly spaced on the support rod. The baffle not only blocks and restricts the support rod from swaying inside the support cylinder, but also bears part of the axial load and assists the support pad to enhance the axial support of the support rod, thereby improving the stability and self-locking reliability of the overall structure.
[0019] 4. As a preferred embodiment of this utility model, when the locking element is a crescent-shaped protrusion, the contour of the support arm blocking part and the arc structure of the crescent-shaped protrusion are precisely matched to form an encircling lock. When the two are engaged, the relative displacement between the support arm and the support pad is limited by the height difference, thereby preventing the support arm from rotating around the support rod. This structure utilizes the rigid matching of the protrusion and the recess to ensure that the locking state does not fail through physical locking, greatly improving the self-locking reliability.
[0020] Furthermore, when the locking element is a circular bead embedded in the support pad and the blocking part has a semi-circular notch, the rolling characteristics of the arc-shaped contact surface are used to achieve smooth engagement and disengagement, while the precise fit between the spherical surface and the arc surface forms a reliable lock.
[0021] In addition, when the locking component is a locking pin with a telescopic spring and a spherical contact surface, and is combined with the movable groove on the support plate and the locking groove of the blocking part, it uses the elastic potential energy of the spring to realize the automatic extension and retraction of the locking pin, and combines the guiding characteristics of the spherical contact surface to complete smooth locking and unlocking, while ensuring the reliability of locking through rigid locking.
[0022] 5. As a preferred embodiment of this utility model, the design of the base improves the overall stability and installation adaptability of the lifter. The mounting holes enable fixed installation, and the anti-slip layer enhances friction resistance, together providing a stable support foundation for the entire self-locking screw lifter, ensuring safety and reliability during the lifting process.
[0023] 6. As a preferred embodiment of this utility model, a small range of height adjustment is achieved by utilizing the precision threaded engagement between the sleeve and the fine-tuning screw. This fine-tuning design compensates for the insufficient adjustment accuracy of the self-locking screw lift, thus meeting the high-precision requirements for lifting height.
[0024] 7. As a preferred embodiment of this utility model, the wear-resistant coating on the outer surface of the support rod and the inner surface of the sleeve, using a coating material with high hardness and low coefficient of friction, reduces the wear rate of the two during relative movement, while reducing frictional resistance, extending the service life of the components and maintaining fitting accuracy, further ensuring the long-term stability and smooth operation of the equipment. Attached Figure Description
[0025] The accompanying drawings, which are provided to further illustrate the present invention and constitute a part of the present invention, illustrate exemplary embodiments of the present invention and are used to explain the present invention, but do not constitute an undue limitation of the present invention.
[0026] In the attached diagram:
[0027] Figure 1 This is a schematic diagram of the structure of the self-locking spiral lift of this utility model;
[0028] Figure 2 This is a structural diagram of the support arm and baffle;
[0029] Figure 3 for Figure 2 A schematic diagram of the structure of the locking element, which is a crescent-shaped protrusion, at point A.
[0030] Figure 4 for Figure 2 A schematic diagram of the structure of the locking element, which is a circular ball, at point A.
[0031] Figure 5 for Figure 2 A schematic diagram of the structure of the locking element, which is a locking pin, at point A in the middle;
[0032] Figure 6 for Figure 2 A cross-sectional view of the base at point B in the middle;
[0033] Figure 7 This is a cross-sectional view of the sleeve;
[0034] Figure label:
[0035] 1. Support cylinder; 11. Support pad; 111. Movable groove; 12. Baffle; 13. Base; 131. Mounting hole; 132. Anti-slip layer;
[0036] 2. Support rod; 21. Support arm; 211. Blocking part; 212. Clearance part; 213. Semi-circular bayonet; 214. Slot; 22. Sleeve; 221. Fine-tuning screw; 222. Support base;
[0037] 3. Locking element; 31. Protrusion; 32. Circular retaining bead; 33. Retaining post; 331. Spherical contact surface; 34. Telescopic spring. Detailed Implementation
[0038] To more clearly illustrate the overall concept of this utility model, a detailed description will be provided below with reference to the accompanying drawings.
[0039] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.
[0040] Furthermore, it should be understood in the description of this utility model that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", 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 simplifying the description, 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.
[0041] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0042] In this invention, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "implementation," "example," "aspect," or "specific example" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0043] Example 1
[0044] A preferred embodiment, such as Figure 1 and Figure 2As shown, in a self-locking spiral lift, the support rod 2 is fully retracted into the support cylinder 1. At this time, the clearance part 212 of the support arm 21 is opposite to the support pad 11, the locking member 3 is in an unengaged state, and the support rod 2 can move axially. When the height needs to be adjusted, the support rod 2 is pushed up or down to rise or fall along the axis of the support cylinder 1. During this process, the support rod 2 drives the support arm 21 to move synchronously. When the avoidance part 212 of the support arm 21 passes the support pad 11, the two do not contact each other, and the support rod 2 can be smoothly pulled out. When the height adjustment is completed, as the support rod 2 moves, the support arm 21 on it moves synchronously along the axis. Multiple support arms 21 correspond to different height levels. The appropriate support arm 21 can be selected according to the required lifting height. The support arm 21 gradually moves closer to or away from the support pad 11 at the end of the support cylinder 1. When the support rod 2 is adjusted to the target height, the support rod 2 is rotated 90°. The blocking part 211 of the support arm 21 fits tightly with the support pad 11. The support pad 11 bears the pressure from the support rod 2 and transmits the force to the support cylinder 1. At the same time, the locking piece 3 on the support pad 11 engages with a specific position of the corresponding support arm 21 to restrict the circumferential movement of the support arm 21. If the height needs to be adjusted to rise or fall to a new target height, continue to rotate the support rod 2 by 90° and repeat the above adjustment and locking process. Throughout the process, the interval distribution of the support arms 21 ensures the continuity and controllability of the lifting process. Each support arm 21 corresponds to a lockable height position. Users can select the appropriate lifting height according to their needs. The operation is convenient, safe and reliable.
[0045] Furthermore, since the support arms 21 are symmetrical along the central axis of the support rod 2 and are evenly spaced axially, the symmetrical structure ensures that the support rod 2 will not be tilted due to the force on one side of the support arm 21 when it contacts the support pad 11, thus ensuring the stability of the overall limit. Moreover, the evenly distributed support arms 21 clearly distinguish different height levels. Since the support arms 21 are evenly spaced axially, the operator can predict the "gear range" of the current lifting height by observing the relative position of the support arms 21 and the support pad 11.
[0046] Meanwhile, the inner wall of the support cylinder 1 is provided with multiple baffles 12 that cooperate with the support arm 21. When the height of the support rod 2 is adjusted, the side of the support arm 21 located inside the support cylinder 1 contacts the baffle 12. The baffle 12 forms a lateral obstruction to the support arm 21, limiting the swaying of the support rod 2 inside the support cylinder 1. At the same time, the end face of the support arm 21, together with the baffle 12 and the support pad 11, bears the axial load, preventing the support rod 2 from sliding down the axis under the action of gravity. The baffle 12 assists the support pad 11 in strengthening the axial fixation of the support rod 2, avoiding the bending deformation of the support arm 21 due to bearing the axial force only through the support pad 11, extending the service life of the component, and thus improving the stability and self-locking reliability of the overall structure.
[0047] In addition, the outer surface of the support rod 2 and the inner surface of the sleeve 22 are both provided with wear-resistant coatings, which fundamentally reduces wear and loss during relative movement, protects the base material of the support rod 2 and the sleeve 22, and maintains the accuracy and stability of height adjustment for a long time.
[0048] Example 2
[0049] like Figures 3-5 As shown, a self-locking spiral lifter, different from embodiment 1, has a locking element 3 that is a protrusion 31 on the support pad 11. When the support rod 2 is adjusted in height, the protrusion 31, that is, the crescent-shaped protrusion, is exposed on the surface of the support pad 11, and the locking element 3 is in an unlocked state without being engaged. When the support rod 2 is adjusted to the target height, the support rod 2 rotates 90°, and the support arm 21 rotates synchronously with it, locking the blocking part 211 of the support arm 21 into the surrounding circle formed by the symmetrical crescent-shaped protrusion. The arc-shaped surface of the protrusion is closely fitted with the side of the blocking part 211. The height difference between the two restricts the circumferential rotation of the support arm 21, achieving stable self-locking and effectively solving the problem of instability of the support rod 2 caused by the circumferential rotation of the support arm 21.
[0050] Furthermore, when the protrusion 31 is a circular bead 32 embedded in the support pad 11, the blocking part 211 of the support arm 21 has a semi-circular notch 213 on the side facing the support pad 11 that mates with the circular bead 32. When the support rod 2 is adjusted to the target height, rotating the support rod 2 causes the support arm 21 to rotate synchronously. The blocking part 211 contacts the support pad 11, allowing the circular bead 32 embedded in the support pad 11 to roll within it. The blocking part 211 of the support arm 21 is in close contact with the circular bead 32 on the side facing the support pad 11. As the circular locking bead 32 rolls, the support arm 21 rotates accordingly. The rolling characteristic of the bead reduces the frictional resistance when the support arm 21 contacts the blocking part 211, minimizing wear and providing buffer space for the locking action. As the support arm 21 continues to rotate, gradually approaching the target angle of 90°, the arc-shaped edge of the locking slot contacts the bead first. Upon reaching 90°, the bead rolls into the semi-circular locking slot 213, with the spherical surface and arc surface completely fitting together. The arc-shaped contact surfaces on both sides block each other, restricting the circumferential rotation of the support arm 21. At this point, the bead and the locking slot form a stable mechanical lock, ensuring that the support arm 21 remains fixed at the target height.
[0051] Furthermore, when the locking element 3 is a locking post 33 with a telescopic spring 34 and a spherical contact surface 331, one side of the locking post 33 is connected to the telescopic spring 34 at the bottom of the movable groove 111. The preload of the spring keeps the locking post 33 extended out of the movable groove 111 under normal conditions. When the support rod 2 is adjusted to the target height, the support rod 2 is rotated, and the support arm 21 rotates synchronously with it. The support arm 21 contacts the support pad 11. At this time, the support arm 21 presses the locking post 33 into the movable groove 111, and the spring is in a compressed state. At this time, the locking post 33 and the support arm 21 are locked together. With the slot 214 completely separated and without locking function, the support rod 2 can rotate freely. As the support rod 2 gradually rotates to the target angle of 90°, the edge of the slot 214 begins to contact the spherical contact surface 331 of the locking post 33. The spherical contact surface 331 reduces the frictional resistance when engaging with the slot 214, facilitating automatic alignment during engagement. When the slot 214 and the locking post 33 are precisely aligned, the pressure of the support arm 21 on the locking post 33 disappears, the spring force is released, and the locking post 33 is pushed out of the movable slot 111. The spherical surface is fully embedded in the slot 214, completing the locking. This design, through the elastic extension and contraction of the spring and the guiding effect of the spherical surface, ensures the reliability of locking while improving the error tolerance and smoothness of operation.
[0052] Example 3
[0053] like Figure 5 As shown, a self-locking spiral lift, unlike Embodiment 1, allows bolts, screws, and other fasteners to be passed through the mounting holes 131 of the base 13 before use, connecting it to the ground, workbench, or other fixed carrier to firmly fix the base 13. This makes the entire lift a stable, rigid support unit, preventing tipping or displacement due to uneven force when carrying heavy objects, thus ensuring the overall stability of the lift structurally. At this time, the anti-slip layer 132 of the base 13 is in close contact with the placement surface. The anti-slip layer 132 is typically made of materials with a high coefficient of friction, such as rubber or silicone, which increases the static friction between the base 13 and the placement surface, preventing the base 13 from sliding on the surface. Simultaneously, the fasteners connected to the mounting holes 131 further restrict the displacement of the base 13, forming a double guarantee with the anti-slip layer 132, ensuring the lift remains stable under load. With the rigid fixation of the mounting hole 131 and the friction enhancement of the anti-slip layer 132, the base 13 provides a stable support foundation for the entire lift, which not only adapts to the installation requirements in different scenarios, but also ensures the safety of lifting operations through multiple anti-slip measures.
[0054] Example 4
[0055] like Figure 6As shown, a self-locking spiral lifter, different from embodiment 1, has a sleeve 22 formed on the side of the support rod 2 facing away from the base 13 after the support rod 2 lifts the load to a position close to the target height and completes self-locking through the limiting component and locking member 3. If a small adjustment of the height is required, the fine-tuning screw 221 can be rotated by tools or manually: when the fine-tuning screw 221 is rotated clockwise, it moves axially away from the sleeve 22 by utilizing its fine thread engagement with the sleeve 22, causing the support seat 222 to rise synchronously. The support seat 222 applies an upward thrust to the load, lifting the load to a higher position, achieving a slight increase in height; when the fine-tuning screw 221 is rotated counterclockwise, it moves axially into the sleeve 22, and the support seat 222 moves downward accordingly. Under the action of the load's own weight, the load descends synchronously with the support seat 222, achieving a slight decrease in height. This two-stage adjustment mode of coarse adjustment + fine adjustment effectively solves the problem of "low accuracy due to large adjustment range" in screw lifts. It retains the large load capacity of screw lifts while achieving high-precision control through fine threads.
[0056] For any parts not mentioned in this utility model, existing technologies can be used or referenced.
[0057] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.
[0058] The above description is merely an embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.
Claims
1. A self-locking spiral lifter, comprising a hollow support cylinder (1) and a support rod (2) sleeved within the support cylinder (1), characterized in that, The top of the support cylinder (1) is connected to a support pad (11) that shields the hollow structure. Multiple support arms (21) are spaced apart on the support rod (2). The support arm (21) has a blocking part (211) and a clearance part (212) that cooperate with the support pad (11). The support pad (11) has a locking element (3).
2. The self-locking screw lift according to claim 1, characterized in that, The support arms (21) are symmetrically arranged along the central axis of the support rod (2), and each set of support arms (21) is evenly distributed along the axial direction of the support rod (2).
3. The self-locking screw lift according to claim 2, characterized in that, The inner wall of the support cylinder (1) is provided with a plurality of baffles (12) that cooperate with the support arm (21) to restrict and fix the position of the support rod (2) through the cooperation of the baffles (12) and the support arm (21).
4. The self-locking screw lift according to claim 1, characterized in that, The locking element (3) is a protrusion (31) provided on the support pad (11), and the protrusion (31) is a crescent-shaped protrusion symmetrically arranged to cooperate with the support arm (21).
5. The self-locking screw lift according to claim 1, characterized in that, The locking member (3) is a circular bead (32) embedded in the support pad (11), and the blocking part (211) has a semi-circular slot (213) that cooperates with the circular bead (32) on the side facing the support pad (11).
6. The self-locking screw lift according to claim 1, characterized in that, The support pad (11) has a movable groove (111), the locking member (3) is a locking post (33) that extends into the movable groove (111), and the blocking part (211) has a locking groove (214) that cooperates with the locking post (33) on the side facing the support pad (11). A telescopic spring (34) is provided between one side of the locking post (33) and the bottom of the movable groove (111), and the other side of the locking post (33) is a spherical contact surface (331).
7. The self-locking screw lift according to claim 1, characterized in that, The support cylinder (1) is connected to a base (13) on the side away from the support pad (11). The base (13) is provided with mounting holes (131) and an anti-slip layer (132).
8. The self-locking screw lift according to claim 7, characterized in that, The support rod (2) has a sleeve (22) formed on the side facing away from the base (13), and a fine-tuning screw (221) is threaded onto the sleeve (22), and the top of the fine-tuning screw (221) has a support seat (222).
9. The self-locking screw lift according to claim 1, characterized in that, The outer surface of the support rod (2) and the inner surface of the sleeve (22) are both provided with a wear-resistant coating.