High-stability concentric limiting spring

Abstract

The utility model discloses a high stability concentric limit spring, relates to spring piece technical field, including inner spring, outer spring and limit mechanism, the limit mechanism includes first limit block and second limit block, the inner spring is provided on the first limit block, one end of inner spring abuts against the first limit block, the other end of inner spring abuts against the second limit block, and the other end of inner spring abuts against the second limit block. The inner spring is arranged on the first limiting block, the other end of the inner spring abuts against the second limiting block, the outer spring is arranged on the second limiting block, one end of the outer spring abuts against the second limiting block, the other end of the outer spring abuts against the first limiting block, and the outer spring and the inner spring are concentrically arranged in a sleeved mode. Due to the combination that the outer spring and the inner spring are concentrically arranged in a sleeved mode, the energy storage capacity and the reaction speed of the whole spring are improved, and meanwhile the stability of the whole structure of the spring is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of spring parts, in particular to a high-stability concentric limit spring. Background Art

[0002] Limit springs, as a special type of spring, have a unique limiting function and are widely used in fields such as automotive manufacturing, electronic equipment, aerospace, and medical devices. They are generally composed of two parts: the spring body and the limiter structure. The spring body provides elastic restoring force, while the limiter structure is used to limit the compression or extension stroke of the spring, preventing it from exceeding a predetermined range. The most notable feature of limit springs is their ability to limit the displacement of an object, preventing it from exceeding a predetermined range. This helps protect related equipment and structures from damage.

[0003] The patent with the announcement date of January 5, 2021 and the announcement number CN212297372U discloses a tension limit spring, including a protective washer, a base, an annular collar and a hook, wherein both ends of the base are fixedly connected to the hook, and the hook and the base are sleeved with an annular collar, the surface of the annular collar is fixedly connected to the protective washer, one end of the hook is movably hinged to a pull plate through a hinge, the surface of the base is fixedly connected to the wear-resistant protrusion, and the surface of the wear-resistant protrusion is provided with a waterproof structure, and the interior of the base is provided with a reinforcement structure. The utility model not only realizes the function of limiting the clamping when the tension limit spring is used, thereby avoiding the phenomenon of the tension limit spring being off-target when used, enhances the use strength of the tension limit spring, and then extends the service life of the tension limit spring, but also realizes the waterproof function of the tension limit spring when used, thereby avoiding the phenomenon of rust on the surface of the tension limit spring when used.

[0004] Among the existing limit springs, most use a combination of a single spring and a limit structure to achieve the purpose of limiting, but the combination of double helical springs has the characteristics of high energy storage and high reaction speed. The use of two springs with the same height and different inner diameters in a concentric sleeve connection can increase the stability and firmness of the spring. The above scheme not only avoids the phenomenon of off-target when the stretch limit spring is used, enhances the strength of the stretch limit spring, and extends the service life of the stretch limit spring, but also realizes the waterproof function of the stretch limit spring when used, and avoids the phenomenon of rust on the surface of the stretch limit spring when used. However, the structural stability and firmness of the single spring still have a lot of room for improvement. The energy storage effect is general when the spring is compressed, and it is easy to be overloaded, affecting the normal operation of the equipment.

[0005] Therefore, it is necessary to provide a highly stable concentric limit spring. Utility Model Content

[0006] The embodiment of the present application provides a highly stable concentric limit spring, which can improve the problems of insufficient structural stability and firmness of a single spring in the related art, general energy storage effect when the spring is compressed, and easy overload use, which affects the normal operation of the equipment.

[0007] An embodiment of the present application provides a highly stable concentric limit spring, comprising an inner spring, an outer spring and a limit mechanism, wherein the limit mechanism comprises a first limit block and a second limit block, wherein the inner spring is arranged on the first limit block, one end of the inner spring abuts against the first limit block, and the other end of the inner spring abuts against the second limit block, and the outer spring is arranged on the second limit block, one end of the outer spring abuts against the second limit block, and the other end of the outer spring abuts against the first limit block, and the outer spring and the inner spring are concentrically arranged.

[0008] The embodiment of the present application provides a highly stable concentric limit spring. Under normal circumstances, the first limit block and the second limit block do not contact each other. After being subjected to pressure, the inner spring and the outer spring are compressed. After being compressed to a certain extent, the first limit block and the second limit block offset each other. At this time, the inner spring and the outer spring cannot be further compressed. After the pressure is removed, under the action of the inner spring and the outer spring, they return to the normal state; after being subjected to tension, the tension generated by the inner spring and the outer spring themselves is eventually in the opposite direction of the tension, offsetting each other and achieving a limiting function.

[0009] The above-mentioned technical solution in the embodiment of the present application has at least the following technical effects: the first limit block and the second limit block play a limiting role in spring compression, and the concentrically arranged combination of the outer spring and the inner spring enhances the overall energy storage capacity and reaction speed of the spring, while increasing the overall structural stability of the spring.

[0010] In some embodiments, a first pillar is provided on the first limiting block, and the inner spring is sleeved on the first pillar.

[0011] In some embodiments, a second pillar is provided on the second limit block, the outer spring is sleeved on the second pillar, the second pillar is provided with a circular through hole, the diameter of the circular through hole is equal to the diameter of the inner spring, and the end of the inner spring away from the first limit block is arranged in the circular through hole and abuts against the second limit block.

[0012] In some embodiments, a connecting rope is provided on the first pillar, one end of the connecting rope is bonded to the first pillar, and the other end of the connecting rope passes through a circular through hole in the second pillar and is bonded to the second limiting block.

[0013] In some embodiments, the length of the connecting rope is equal to the maximum distance that the inner spring and the outer spring can stretch.

[0014] In some embodiments, both ends of the inner spring and the outer spring are zero-angle end rings, and the end surfaces remain perpendicular to the spring axis.

[0015] In some embodiments, a groove is provided on a side of the first limiting block and the second limiting block close to the spring, and a clamping block is provided on the end ring, and the clamping block is clamped with the first limiting block and the second limiting block through the groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0017] Figure 1 A schematic diagram of the overall structure of a highly stable concentric limit spring provided in an embodiment of the present application;

[0018] Figure 2 A schematic diagram of a portion of the structure of a highly stable concentric limit spring provided in an embodiment of the present application;

[0019] Figure 3 A schematic diagram of a partial cross-sectional structure of a highly stable concentric limit spring provided in an embodiment of the present application.

[0020] Among them, the reference numerals in the figures are:

[0021] 1. Inner spring; 2. Outer spring; 3. Limiting mechanism; 31. First limiting block; 32. Second limiting block; 4. First pillar; 5. Second pillar; 6. Connecting rope; 7. End ring; 8. Clamping block. DETAILED DESCRIPTION

[0022] Based on this, in order to improve the problems of insufficient structural stability and firmness of a single spring in the related art, general energy storage effect when the spring is compressed, easy overload use, and affecting the normal operation of the equipment, the embodiment of the present application provides the following solution.

[0023] Please also refer to Figures 1-3, including an inner spring 1, an outer spring 2 and a limiting mechanism 3, the limiting mechanism 3 including a first limiting block 31 and a second limiting block 32, the inner spring 1 is arranged on the first limiting block 31, one end of the inner spring 1 abuts against the first limiting block 31, and the other end of the inner spring 1 abuts against the second limiting block 32, the outer spring 2 is arranged on the second limiting block 32, one end of the outer spring 2 abuts against the second limiting block 32, and the other end of the outer spring 2 abuts against the first limiting block 31, and the outer spring 2 and the inner spring 1 are concentrically arranged.

[0024] With such arrangement, under normal circumstances, the first limit block 31 and the second limit block 32 do not contact each other. After being subjected to pressure, the inner spring 1 and the outer spring 2 are compressed. After being compressed to a certain extent, the first limit block 31 and the second limit block 32 are offset. At this time, the inner spring 1 and the outer spring 2 cannot be further compressed. After the pressure is removed, under the action of the inner spring 1 and the outer spring 2, they return to the normal state; after being subjected to tension, the tension generated by the inner spring 1 and the outer spring 2 themselves is eventually in the opposite direction of the tension, offsetting each other and achieving a limiting function.

[0025] Optionally, in some embodiments, please refer to Figure 2 as well as Figure 3 The first limit block 31 is bonded with a first pillar 4, and the first pillar 4 is T-shaped. The diameter of the end of the first pillar 4 close to the first limit block 31 is smaller than the diameter of the end of the first pillar 4 away from the first limit block 31, and the end of the first pillar 4 away from the first limit block 31 is provided with a rounded corner. The inner spring 1 is sleeved on the first pillar 4, and the second limit block 32 is bonded with a second pillar 5. The second pillar 5 is T-shaped, and the diameter of the end of the second pillar 5 close to the second limit block 32 is smaller than the diameter of the end of the second pillar 5 away from the second limit block 32, and the end of the second pillar 5 away from the second limit block 32 is provided with a rounded corner. The outer spring 2 is sleeved on the second pillar 5, and the second pillar 5 is provided with a circular through hole. The diameter of the circular through hole is equal to the outer diameter of the inner spring 1, and the end of the inner spring 1 away from the first limit block 31 passes through the circular through hole and abuts against the second limit block 32.

[0026] In this arrangement, the diameter of the first pillar 4 is consistent with the inner diameter of the inner spring 1, the diameter of the second pillar 5 is consistent with the inner diameter of the outer spring 2, the height of the first pillar 4 is less than the length of the inner spring 1 in the normal state, and its height is about one-third of the length of the inner spring 1, the height of the second pillar 5 is less than the length of the outer spring 2 in the normal state, and its height is about one-third of the length of the outer spring 2, a part of the inner spring 1 can be just slidably connected and sleeved on the first pillar 4, a part of the outer spring 2 can be just slidably connected and sleeved on the second pillar 5, when subjected to external pressure, the inner spring 1 and the outer spring 2 are compressed, and the first pillar The rounded corner design on the column 4 and the second pillar 5 makes the compression and stretching process of the spring smoother. The first pillar 4 slides into the circular through hole of the second pillar 5. When the first pillar 4 abuts the second limit block 32, if pressure is continued to be applied, the inner spring 1 and the outer spring 2 will not be compressed, and the limit spring reaches the maximum degree to which it can be compressed. The inner spring 1 and the outer spring 2 have a certain rigidity. Under normal conditions, they are placed flat and will not bend downward significantly due to gravity. In the vertical state, when not subject to external force, they will not deviate to the left or right, thereby improving the overall stability of the limit spring.

[0027] Optionally, in some embodiments, please refer to Figure 3 A connecting rope 6 is provided on the first pillar 4, one end of the connecting rope 6 is bonded to the first pillar 4, and the other end of the connecting rope 6 passes through the circular through hole in the second pillar 5 and is bonded to the second limit block 32. The length of the connecting rope 6 is equal to the maximum distance that the inner spring 1 and the outer spring 2 can be stretched.

[0028] With this arrangement, when the limit spring as a whole is subjected to tension, the inner spring 1 and the outer spring 2 are stretched. Generally, after the spring is stretched to a certain extent, it breaks or is permanently deformed and cannot be restored to its original state. By designing the connecting rope 6, and when the connecting rope 6 is stretched to a taut state, the limit spring reaches the maximum extent to which it can be stretched. At this time, the spring is still within the specified elastic limit and can return to its original length after the tension is released. After the connecting rope 6 is tightened, it greatly bears the tension for the spring.

[0029] Optionally, in some embodiments, please refer to Figure 3 The inner spring 1 and the outer spring 2 have end rings 7 at both ends with a zero angle, and the end faces are perpendicular to the spring axis.

[0030] With this arrangement, the inner spring 1 and the outer spring 2 have end rings 7 at both ends with a zero angle, that is, the end rings 7 of the springs are ground flat, thereby increasing the contact area between the inner spring 1 and the outer spring 2 and the first limit block 31 and the second limit block 32. The end faces remain perpendicular to the spring axis, the spring is compressed or stretched as a whole, the force is more concentrated, and the overall stability of the limit spring is increased.

[0031] Optionally, in some embodiments, please refer to Figure 1 as well as Figure 3 The first limit block 31 and the second limit block 32 are provided with grooves on the side close to the spring, and a clamping block 8 is provided on the end ring 7. The clamping block 8 is U-shaped and is clamped with the first limit block 31 and the second limit block 32 through the grooves.

[0032] With this arrangement, the first force-bearing points of the limit spring as a whole are the first pillar 4 and the second pillar 5. When the limit spring is subjected to pressure, the inner spring 1 and the outer spring 2 are compressed, and the inner spring 1 and the outer spring 2 are still in contact with the first pillar 4 and the second pillar 5. However, when the limit spring is subjected to tension, the first pillar 4 and the second pillar 5 are first subjected to force, and the distance between the two becomes larger. The U-shaped clamping block 8 covers the end ring 7 of the inner spring 1 and the outer spring 2, and the first limit block 31 and the second limit block 32 are clamped to fix the two ends of the inner spring 1 and the outer spring 2.

[0033] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. Highly stable concentric limit spring, characterized by: The invention comprises an inner spring (1), an outer spring (2) and a limiting mechanism (3), wherein the limiting mechanism (3) comprises a first limiting block (31) and a second limiting block (32), wherein the inner spring (1) is arranged on the first limiting block (31), one end of the inner spring (1) abuts against the first limiting block (31), and the other end of the inner spring (1) abuts against the second limiting block (32), and the outer spring (2) is arranged on the second limiting block (32), one end of the outer spring (2) abuts against the second limiting block (32), and the other end of the outer spring (2) abuts against the first limiting block (31), and the outer spring (2) and the inner spring (1) are concentrically sleeved.

2. The high stability concentric limit spring according to claim 1, characterized in that: A first support column (4) is provided on the first limiting block (31), and the inner spring (1) is sleeved on the first support column (4).

3. The high stability concentric limit spring according to claim 2, characterized in that: A second pillar (5) is provided on the second limiting block (32), the outer spring (2) is sleeved on the second pillar (5), the second pillar (5) is provided with a circular through hole, the outer diameter of the circular through hole is the same as the diameter of the inner spring (1), and the end of the inner spring (1) away from the first limiting block (31) is provided in the circular through hole and abuts against the second limiting block (32).

4. The high stability concentric limit spring according to claim 3, characterized in that: A connecting rope (6) is provided on the first pillar (4), one end of the connecting rope (6) is bonded to the first pillar (4), and the other end of the connecting rope (6) passes through a circular through hole in the second pillar (5) and is bonded to the second limiting block (32).

5. The high stability concentric limit spring according to claim 4, characterized in that: The length of the connecting rope (6) is equal to the maximum distance that the inner spring (1) and the outer spring (2) can stretch.

6. The high stability concentric limit spring according to claim 5, characterized in that: Both ends of the inner spring (1) and the outer spring (2) are end rings (7) with a zero angle, and the end faces are perpendicular to the spring axis.

7. The high stability concentric limit spring according to claim 6, characterized in that: A groove is provided on one side of the first limiting block (31) and the second limiting block (32) close to the spring, and a clamping block (8) is provided on the end ring (7). The clamping block (8) is clamped with the first limiting block (31) and the second limiting block (32) through the groove.

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