A length-adjustable self-locking linkage mechanism

Abstract

The application discloses a length-adjustable self-locking connecting rod mechanism, which comprises a connecting rod and two ear rings with screw rods, and further comprises two locking sleeves and two screw sleeves, wherein the two screw sleeves are fixed at the two ends of the connecting rod, the inner periphery of the screw sleeve is provided with an internal thread, the outer periphery of the screw sleeve is provided with an external thread with a screw direction opposite to that of the internal thread, the two locking sleeves are respectively threadedly connected with the external threads of the two screw sleeves, the screw rods of the two ear rings are respectively threadedly connected with the internal threads of the two screw sleeves and respectively pass through the two locking sleeves, and the corresponding locking sleeves and the screw rods are provided with locking mechanisms for locking the two. The length-adjustable self-locking connecting rod mechanism has the advantages of simple structure, adjustable length and self-locking function for preventing loosening.

Description

Technical Field

[0001] This invention relates to the field of linkage mechanism technology, and in particular to a self-locking linkage mechanism with adjustable length. Background Technology

[0002] In mechanical transmission mechanisms driven by multiple links, the distance between the hinge points at both ends of each link is fixed; theoretically, the hinge points should be machined as a fixed-length, one-piece structure. However, in practical applications, mechanisms connected to both ends of the links often have at least one end that is relatively movable, such as... Figure 1 As shown. Alternatively, if the mechanism's dimensions and weight are very large, the connecting rod may be impossible to install, or installation may be inconvenient. Therefore, it is necessary to process the connecting rod into a structure with adjustable hinge points at both ends. Traditional adjustable linkage mechanisms include... Figure 2 As shown, the assembly includes a connecting rod 1, with threaded holes 11 machined at both ends. These holes engage with the screw 21 of the earring 2 to form an adjustable connecting rod. To ensure the connecting rod's length is fixed, the screw 21 needs to be locked after installation or prevented from loosening. Traditional anti-loosening structures rely on a lock nut 3 connected to the screw 21 and pressed against the end face of the connecting rod 1, or a locking washer 31 is used to fix the screw 21, the connecting rod 1, and the lock nut 3 respectively. When the linkage mechanism is subjected to tension, there is a tendency for the locking nut 3 to separate from the connecting rod 1. When the tension is large, due to the elastic deformation of the material, the locking nut 3 and the connecting rod 1 are completely separated. At this time, the locking nut 3 fails to provide a locking function. Under repeated tension and pressure, the threaded fit between the screw 21 and the screw hole 11 will loosen. Furthermore, since the threads at both ends of the connecting rod 1 rotate in opposite directions, under the action of an external force (such as inertial force or friction), the connecting rod 1 will be driven to rotate around the axis of the screw 21. This will change the hinge point distance of the linkage mechanism, affecting the transmission effect of the linkage mechanism. Therefore, the existing linkage mechanism has poor anti-loosening effect, or even minimal effect, and requires frequent tightening during use; otherwise, the hinge point length of the connecting rod 1 will change, reducing the transmission accuracy. Moreover, in situations where installation space is limited, tightening the locking nut 3 is very difficult, and the screw 21 tends to loosen frequently. Allowing the screw 21 to loosen may cause certain safety hazards. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a self-locking linkage mechanism with simple structure, adjustable length, and self-locking function to prevent loosening.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] An adjustable-length self-locking linkage mechanism includes a connecting rod and two lugs with screws. The adjustable-length self-locking linkage mechanism also includes two locking sleeves and two threaded sleeves. The two threaded sleeves are respectively fixed to both ends of the connecting rod. The inner circumference of the threaded sleeve is provided with an internal thread, and the outer circumference is provided with an external thread in the opposite direction to the internal thread. The two locking sleeves are threadedly connected to the external threads of the two threaded sleeves. The screws of the two lugs are threadedly connected to the internal threads of the two threaded sleeves and respectively pass through the two locking sleeves. A locking mechanism for locking the locking sleeves and screws is provided between them.

[0006] As a further improvement to the above technical solution:

[0007] The locking mechanism includes a locking element, and a locking part is provided on the peripheral wall of the screw. The locking element is disposed on the locking sleeve and inserted into the locking part.

[0008] The locking element is a locking screw, which passes through the side wall of the locking sleeve and is threadedly connected to the locking sleeve.

[0009] The screw has an outer ring at one end near the earring, and the locking part is located on the outer ring.

[0010] The locking element is located at the end of the locking sleeve away from the connecting rod.

[0011] The locking element is provided in multiple ways and is arranged at intervals around the center of the locking sleeve. The locking part is an annular groove arranged around the screw, and each locking element is inserted into the annular groove.

[0012] The earring contains a bearing.

[0013] The earring is provided with a locking element for locking the bearing.

[0014] The internal threads of the two sleeves are in opposite directions.

[0015] The threaded sleeve is welded to the connecting rod.

[0016] Compared with the prior art, the advantages of the present invention are as follows:

[0017] The adjustable-length self-locking linkage mechanism of the present invention utilizes the opposite helical directions of the internal and external threads of the screw sleeve. When the screw tends to screw inward relative to the connecting rod, the locking sleeve tends to screw outward relative to the connecting rod; conversely, when the screw tends to screw outward relative to the connecting rod, the locking sleeve tends to screw inward relative to the connecting rod. The mutual restraint of the rotation of the locking sleeve and the screw relative to the connecting rod creates a self-locking mechanism on the screw, preventing loosening and thus maintaining the length of the linkage mechanism. Furthermore, the locking mechanism can be released from its locking effect on the locking sleeve and the screw, allowing for forward rotation of the screw and reverse rotation of the locking sleeve, or vice versa, to adjust the length of the linkage mechanism. After the length is adjusted, the locking mechanism locks the sleeve and the screw again. At this point, the mutual restraint of the rotation of the locking sleeve and the screw relative to the connecting rod ensures that the length of the linkage mechanism remains constant. This adjustable-length self-locking linkage mechanism features a simple structure, adjustable length, and a self-locking function to prevent loosening. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a linkage-driven mechanical transmission mechanism.

[0019] Figure 2 This is a schematic diagram of the main cross-section of an existing linkage mechanism.

[0020] Figure 3 This is a front view schematic diagram of the self-locking linkage mechanism with adjustable length according to the present invention.

[0021] Figure 4 yes Figure 3 Enlarged view of point A in the middle.

[0022] Figure 5 yes Figure 3 Schematic diagram of the cross-sectional structure of BB.

[0023] Figure 6 yes Figure 5 Enlarged view of point C in the middle.

[0024] The labels in the diagram represent:

[0025] 1. Connecting rod; 11. Screw hole; 2. Earring; 21. Screw; 211. Locking part; 22. Outer ring body; 3. Locking nut; 31. Stop washer; 4. Locking sleeve; 5. Screw sleeve; 51. Internal thread; 52. External thread; 6. Locking element; 7. Bearing; 8. Locking element. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] As shown in this disclosure and the claims, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" are not specifically singular and may include plural forms. The terms "first," "second," and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "comprising" or "including" mean that the element or object preceding the word covers the element or object listed after the word and its equivalents, without excluding other elements or objects. The terms "connected" or "linked" are not limited to physical or mechanical connections but may include electrical connections, whether direct or indirect.

[0028] Figures 1 to 6 An embodiment of the adjustable length self-locking linkage mechanism of the present invention is shown. The adjustable length self-locking linkage mechanism of this embodiment includes a connecting rod 1 and two lugs 2 with screws 21. The adjustable length self-locking linkage mechanism also includes two locking sleeves 4 and two screw sleeves 5. The two screw sleeves 5 are respectively fixed at both ends of the connecting rod 1. The inner circumference of the screw sleeve 5 is provided with an internal thread 51, and the outer circumference is provided with an external thread 52 that is opposite to the helical direction of the internal thread 51. The two locking sleeves 4 are threadedly connected to the external threads 52 of the two screw sleeves 5 respectively. The screws 21 of the two lugs 2 are threadedly connected to the internal threads 51 of the two screw sleeves 5 respectively and are respectively inserted into the two locking sleeves 4. A locking mechanism for locking the two is provided between the corresponding locking sleeves 4 and the screws 21.

[0029] Because the internal threads 51 and external threads 52 of the screw sleeve 5 have opposite helical directions, when the screw 21 tends to screw in relative to the connecting rod 1, the locking sleeve 4 tends to screw out relative to the connecting rod 1, and when the screw 21 tends to screw out relative to the connecting rod 1, the locking sleeve 4 tends to screw in relative to the connecting rod 1. The rotation of the locking sleeve 4 and the screw 21 relative to the connecting rod 1 mutually restricts each other, causing the screw 21 to self-lock and preventing loosening, thus keeping the length of the linkage mechanism constant. Furthermore, the locking mechanism can be released from locking the locking sleeve 4 and the screw 21, and then the screw 21 can be rotated forward and the locking sleeve 4 in the reverse direction, or vice versa, to adjust the length of the linkage mechanism. After the length is adjusted, the locking mechanism locks the sleeve 4 and the screw 21 again. At this time, the rotation of the locking sleeve 4 and the screw 21 relative to the connecting rod 1 mutually restricts each other, keeping the length of the linkage mechanism constant. This adjustable-length self-locking linkage mechanism has a simple structure, adjustable length, and a self-locking function to prevent loosening.

[0030] In this embodiment, as Figure 5 and Figure 6As shown, the locking mechanism includes a locking element 6. A locking portion 211 is provided on the peripheral wall of the screw 21. The locking element 6 is mounted on the locking sleeve 4 and inserted into the locking portion 211. When the locking element 6 is inserted into the locking portion 211, it locks the locking sleeve 4 and the screw 21. When the locking element 6 is pulled out of the locking portion 211, it releases the lock on the locking sleeve 4 and the screw 21, allowing the locking sleeve 4 and the screw 21 to rotate independently relative to the connecting rod 1. The structure is simple and the adjustment is convenient.

[0031] In this embodiment, the locking element 6 is a locking screw, which passes through the side wall of the locking sleeve 4 and is threadedly connected to the locking sleeve 4. By turning the locking screw, the locking part 211 can be inserted or pulled out, thereby locking or unlocking the locking sleeve 4 and the screw 21. The structure is simple and the operation is convenient.

[0032] In this embodiment, the screw 21 has an outer ring 22 at one end near the earring 2, and a locking part 211 is provided on the outer ring 22. Specifically, the outer diameter of the outer ring 22 is smaller than the inner diameter of the locking sleeve 4, and it is located in the locking sleeve 4.

[0033] In this embodiment, the locking element 6 is located at the end of the locking sleeve 4 away from the connecting rod 1. This increases the effective adjustment length of the locking sleeve 4 relative to the connecting rod 1, thereby improving the length adjustment range of this self-locking linkage mechanism.

[0034] In this embodiment, multiple locking members 6 are arranged at intervals around the center of the locking sleeve 4. The locking part 211 is an annular groove formed around the screw 21, and each locking member 6 is inserted into the annular groove. The locking sleeve 4 and the screw 21 are locked together by multiple pairs of locking members 6 inserted into the annular groove, resulting in a better locking effect. In other embodiments, the locking part 211 is a lock hole, with multiple locking members arranged around the screw 21, and each locking member 6 is inserted into the corresponding lock hole.

[0035] In this embodiment, the earring 2 is equipped with a bearing 7. This facilitates rotational connection with an external mechanism and adjustment of the relative angle.

[0036] In this embodiment, the earring 2 is provided with a locking member 8 for locking the bearing 7. The locking member 8 can prevent the bearing 7 from rotating, so that the earring 2 and the external mechanism no longer rotate relative to each other and remain fixed.

[0037] In this embodiment, the internal threads 51 of the two screw sleeves 5 are in opposite directions. Thus, after disconnecting the two locking sleeves 4 from the connecting rod 1, the overall length can be adjusted by rotating the connecting rod 1.

[0038] In this embodiment, the threaded sleeve 5 is welded to the connecting rod 1. The connection is reliable and the structure is stable.

[0039] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the present invention, should fall within the protection scope of the present invention.

Claims

1. A length-adjustable self-locking linkage mechanism, comprising a connecting rod (1) and two earrings (2) with screws (21), characterized in that: The length-adjustable self-locking linkage mechanism also includes two locking sleeves (4) and two threaded sleeves (5). The two threaded sleeves (5) are respectively fixed at both ends of the linkage (1). The inner circumference of the threaded sleeve (5) is provided with an internal thread (51), and the outer circumference is provided with an external thread (52) opposite to the helical direction of the internal thread (51). The two locking sleeves (4) are threadedly connected to the external threads (52) of the two threaded sleeves (5). The screws (21) of the two earrings (2) are threadedly connected to the internal threads (51) of the two threaded sleeves (5) and respectively pass through the two locking sleeves. In the tight sleeve (4), a locking mechanism for locking the corresponding locking sleeve (4) and screw (21) is provided; when the locking mechanism locks the locking sleeve (4) and screw (21), the rotation of the locking sleeve (4) and screw (21) relative to the connecting rod (1) is mutually restricted; when the locking mechanism releases the locking effect on the locking sleeve (4) and screw (21), the screw (21) can rotate relative to the connecting rod (1) to adjust the length; the internal threads (51) of the two screw sleeves (5) have opposite thread directions; the screw sleeves (5) are welded to the connecting rod (1).

2. The length-adjustable self-locking linkage mechanism according to claim 1, characterized in that: The locking mechanism includes a locking element (6), and a locking part (211) is provided on the peripheral wall of the screw (21). The locking element (6) is provided on the locking sleeve (4) and inserted into the locking part (211).

3. The length-adjustable self-locking linkage mechanism according to claim 2, characterized in that: The locking element (6) is a locking screw, which passes through the side wall of the locking sleeve (4) and is threadedly connected to the locking sleeve (4).

4. The length-adjustable self-locking linkage mechanism according to claim 2, characterized in that: The screw (21) has an outer ring (22) at one end near the earring (2), and the locking part (211) is provided on the outer ring (22).

5. The length-adjustable self-locking linkage mechanism according to claim 2, characterized in that: The locking element (6) is located at the end of the locking sleeve (4) away from the connecting rod (1).

6. The length-adjustable self-locking linkage mechanism according to claim 2, characterized in that: The locking member (6) is provided in multiple ways and is arranged at intervals around the center of the locking sleeve (4). The locking part (211) is an annular groove provided around the screw (21), and each locking member (6) is inserted into the annular groove.

7. The length-adjustable self-locking linkage mechanism according to any one of claims 1 to 6, characterized in that: The earring (2) is provided with a bearing (7).

8. The length-adjustable self-locking linkage mechanism according to claim 7, characterized in that: The earring (2) is provided with a locking element (8) for locking the bearing (7).

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