elastic return means

Abstract

The elastic reset mechanism provided by the embodiment of the application comprises: a fixed shaft provided with a first clamping installation groove; a moving part sleeved and slidably arranged along the fixed shaft, the moving part being provided with a first installation hole, and the fixed shaft penetrating through the first installation hole; an elastic part, the elastic part being sleeved on the fixed shaft and arranged on opposite sides of the moving part along the extension direction of the fixed shaft; a first limiting part, the first limiting part being capable of being clamped in the first clamping installation groove, and the first limiting part being capable of limiting the elastic part corresponding to the first limiting part on one side of the first limiting part without crossing the first limiting part; and a first blocking part, the first blocking part being arranged between the first limiting part and the elastic part; along the radial direction of the fixed shaft, the radial size of the first installation hole is greater than the outer diameter size of the first limiting part and smaller than the outer diameter size of the first blocking part. The moving part can complete reset only by relying on the elastic part on one side, avoiding the interference of the elastic part on the other side of the moving part on the moving part, and thus enabling the moving part to be stably reset.

Description

Technical Field

[0001] This application belongs to the field of mechanical motion mechanism technology, and in particular relates to an elastic reset mechanism. Background Technology

[0002] In the design of some mechanical structures, there are often fixed parts and moving parts that move relative to the fixed parts. In some cases, the moving parts need to return to their initial position after movement. In this case, a reset mechanism is required to drive the moving parts back to their initial position.

[0003] In the related technology, the resetting mechanism has the problem that the moving part cannot be stably reset during the resetting process.

[0004] Therefore, a new elastic reset mechanism is urgently needed. Summary of the Invention

[0005] This application provides an elastic reset mechanism that enables a moving part to be stably reset.

[0006] This application provides an elastic reset mechanism, comprising: a fixed shaft having a first locking mounting groove; a moving member sleeved and slidably disposed along the fixed shaft, the moving member having a first mounting hole through which the fixed shaft passes; an elastic member sleeved on the fixed shaft, with elastic members disposed on opposite sides of the moving member along the extension direction of the fixed shaft; a first limiting member capable of locking in the first locking mounting groove, the first limiting member restricting the elastic member corresponding to itself to one side of the first limiting member so as not to cross the first limiting member; and a first stop member disposed between the first limiting member and the elastic member; wherein, along the radial direction of the fixed shaft, the radial dimension of the first mounting hole is greater than the outer diameter of the first limiting member and smaller than the outer diameter of the first stop member.

[0007] In some embodiments, the elastic reset mechanism further includes a second limiting member, the fixed shaft is provided with a second locking mounting groove, the second limiting member can be locked in the second locking mounting groove, and the second limiting member can restrict the elastic member corresponding to itself to the side of the second limiting member close to the first limiting member so that it does not cross the second limiting member.

[0008] In some embodiments, the elastic reset mechanism further includes a second stop disposed between the second limiting member and the elastic member.

[0009] In some embodiments, there are multiple second locking slots, and the compression of the elastic member is greater when the second limiting member is locked in the second locking slot closer to the moving member.

[0010] In some embodiments, the elastic reset mechanism further includes a fixing member disposed on a fixed shaft and disposed on the side of the elastic member away from the moving member.

[0011] In some embodiments, the elastic reset mechanism further includes a third limiting member, the fixed shaft is provided with a third locking mounting groove, the third limiting member can be locked in the third locking mounting groove, and the third limiting member can restrict the fixed member corresponding to itself to the side of the third limiting member close to the elastic member and prevent it from going beyond the third limiting member.

[0012] In some embodiments, the elastic element includes at least one of a mechanical spring and a gas spring.

[0013] In some embodiments, the moving part is provided with a second mounting hole for connection with the moving part.

[0014] In some embodiments, the fastener is provided with a third mounting hole for connection with the fixing part.

[0015] In some embodiments, the first limiting member, the second limiting member, and the third limiting member are all elastic retaining rings of the same size, and the first stop member and the second stop member are both baffles of the same size.

[0016] The elastic reset mechanism provided in this application embodiment has elastic elements on both opposite sides of the moving member, and a first limiting member can be engaged in a first locking mounting groove. The first limiting member can restrict the corresponding elastic element on one side of the first limiting member so that it does not cross the first limiting member. A first stop is disposed between the first limiting member and the elastic element. Moreover, along the radial direction of the fixed shaft, the radial dimension of the first mounting hole is larger than the outer diameter of the first limiting member and smaller than the outer diameter of the first stop. Therefore, when the moving member moves to one side, it can cross the first limiting member, causing the first stop and the corresponding elastic element to move to one side. However, since there is a first limiting member on the other side of the moving member, the elastic element on the other side of the moving member is restricted from crossing the first limiting member, so the elastic element on the other side of the moving member will not move with the moving member. Therefore, during the reset process of the moving member, the moving member can complete the reset by relying only on the elastic element on one side, avoiding interference from the elastic element on the other side of the moving member, thereby enabling the moving member to reset stably. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a cross-sectional view of an elastic reset mechanism provided in some embodiments of this application;

[0019] Figure 2 This is a cross-sectional view of an elastic reset mechanism provided in some embodiments of this application when it is not in motion;

[0020] Figure 3 This is a cross-sectional view of an elastic reset mechanism provided in some embodiments of this application during movement;

[0021] Figure 4 This is a side view of an elastic reset mechanism provided in some embodiments of this application;

[0022] Figure 5 This is a top view of an elastic reset mechanism provided in some embodiments of this application;

[0023] Figure 6 This is a perspective view of an elastic reset mechanism provided in some embodiments of this application.

[0024] Reference numerals: 10: Fixed shaft; 110: First locking mounting groove; 120: Second locking mounting groove; 130: Third locking mounting groove; 20: Moving part; 210: First mounting hole; 220: Second mounting hole; 30: Elastic part; 40: First limiting part; 50: First stop part; 60: Second limiting part; 70: Second stop part; 80: Fixed part; 810: Third mounting hole; 90: Third limiting part. Detailed Implementation

[0025] The features and exemplary embodiments of various aspects of this application will now be described in detail. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain this application and are not configured to limit this application. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples of this application.

[0026] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0027] In the design of some mechanical structures, the fixed part and the moving part that moves relative to the fixed part are often involved. In some cases, the moving part is required to return to the initial position after movement. At this time, a reset mechanism needs to be configured to drive the moving part to return to the initial position.

[0028] There is a kind of motion mechanism whose moving part needs to move in two opposite directions, and its reset position is in the middle of the two motion strokes. Such a mechanism is called a centering reset mechanism. Currently, the solution for such a motion mechanism is to add a set of springs on both sides of the moving part. In this way, the moving part will be subjected to two forces in opposite directions. After the moving part moves, the compression amounts of the springs on both sides change, and the magnitudes of the forces also change. The resultant force of these two forces will push the moving part to move. When these two forces are balanced, the moving part stops moving, that is, the reset is achieved.

[0029] Although the above solution solves the problem of centering reset, there are still some defects, which can be seen through calculation. When the parameters of the spring take the following values:

[0030] The elastic coefficient of the spring is K,

[0031] The original lengths of the springs on both sides are L0,

[0032] In the reset state, the lengths of the springs on both sides are L1,

[0033] The moving distance of the moving part relative to the reset state is A;

[0034] Because one side of the spring shortens and the other side elongates after the moving part moves, and due to the limitation of the original length L0 of the spring, two cases need to be discussed:

[0035] The first case, when A < L0 - L1, the forces exerted by the springs on both sides on the moving part are respectively:

[0036] One side is (L0 - L1 + A)K; the other side is (L0 - L1 - A)K;

[0037] The resultant force of the springs on both sides is 2AK,

[0038] The second case, when A > L0 - L1, the forces exerted by the springs on both sides on the moving part are respectively:

[0039] One side is (L0 - L1 + A)K; the other side is 0;

[0040] The resultant force of the springs on both sides is (L0 - L1 + A)K,

[0041] The calculations above show that: 1. When the movement distance A of the moving part is greater than L0-L1, during the reset process of the moving part, it needs to go through the second situation mentioned above first, and then the first situation mentioned above. During the transition from the second situation to the first situation, the resultant force of the springs on both sides of the moving part changes abruptly. Therefore, the resultant force of the springs on both sides is not linear, which will cause the moving part to vibrate. This is not allowed in some scenarios, such as the vibration of the moving part causing objects on the moving part to fall off. 2. When the movement distance A is very small, the resultant force of the springs on both sides is 2AK. It can be seen that this value is also very small. That is, when the moving part is in the reset state (centering state), if the moving part moves slightly to both sides, the springs on both sides cannot provide enough force to stabilize it in the reset state (centering state). In other words, the moving part will still produce a certain amount of movement in the reset state (centering state), which is especially obvious when the fixed part also moves.

[0042] In summary, the resetting mechanism in the relevant technology has the problem that the moving part cannot be stably reset during the resetting process.

[0043] In order to solve the technical problems existing in the related technologies, this application provides an elastic reset mechanism.

[0044] See Figures 1 to 3 This application provides an elastic reset mechanism, comprising: a fixed shaft 10 having a first locking mounting groove 110; a moving member 20, which is sleeved and slidably disposed along the fixed shaft 10, the moving member 20 having a first mounting hole 210 through which the fixed shaft 10 passes; an elastic member 30, which is sleeved on the fixed shaft 10, and elastic members 30 are disposed on opposite sides of the moving member 20 along the extension direction of the fixed shaft 10; a first limiting member 40, which can be locked in the first locking mounting groove 110, and the first limiting member 40 can restrict the corresponding elastic member 30 to one side of the first limiting member 40 so that it does not cross the first limiting member 40; and a first stop 50, which is disposed between the first limiting member 40 and the elastic member 30; wherein, along the radial direction of the fixed shaft 10, the radial dimension of the first mounting hole 210 is greater than the outer diameter of the first limiting member 40 and smaller than the outer diameter of the first stop 50.

[0045] like Figure 3As shown, the diameter of the first mounting hole 210 is D, the outer diameter of the first limiting member 40 is d, and the outer diameter of the first stop member 50 is S. The radial dimension of the first mounting hole 210 is greater than the outer diameter of the first limiting member 40 and less than the outer diameter of the first stop member 50, i.e., d < D < S. Therefore, it can be known that when the moving member 20 moves to one side, the moving member 20 can pass over the first limiting member 40 on that side, causing the first stop member 50 and the corresponding elastic member 30 on that side to move to one side, while the elastic member 30 on the other side of the moving member 20 will not follow the moving member 20.

[0046] The elastic reset mechanism provided in this application embodiment has elastic elements 30 on both sides of the moving member 20, and a first limiting member 40 can be engaged in the first locking mounting groove 110. The first limiting member 40 can restrict the elastic element 30 corresponding to itself to one side of the first limiting member 40 so that it does not cross the first limiting member 40. A first stop member 50 is disposed between the first limiting member 40 and the elastic element 30. Moreover, along the radial direction of the fixed shaft 10, the radial dimension of the first mounting hole 210 is greater than the outer diameter of the first limiting member 40 and smaller than the outer diameter of the first stop member 50. Therefore, when the moving member 20 moves to one side, the moving member 20 can cross the first limiting member 40, driving the first stop member 50 and the corresponding elastic element 30 to move to one side. However, since there is a first limiting member 40 on the other side of the moving member 20, the elastic element 30 on the other side of the moving member 20 can be restricted from crossing the first limiting member 40, so the elastic element 30 on the other side of the moving member 20 will not move with the moving member 20. Therefore, during the resetting process of the moving part 20, the moving part 20 can complete the resetting process relying solely on the elastic element 30 on one side, avoiding interference from the elastic element 30 on the other side of the moving part 20, thereby enabling the moving part 20 to reset stably. Furthermore, the elastic resetting mechanism provided in this embodiment also has the advantages of simple structure, low cost, and easy installation.

[0047] See Figures 2 to 3 When the spring parameters take the following values:

[0048] The elastic modulus of elastic element 30 is K.

[0049] The original length of the elastic elements 30 on both sides is L0.

[0050] In the reset state, the length of the elastic elements 30 on both sides is L1.

[0051] After the moving part 20 moves to the left, the distance it moves relative to the reset state is A;

[0052] Because the elastic element 30 on the left side shortens after the moving part 20 moves, while the elastic element 30 on the right side remains unchanged, the forces exerted by the elastic elements 30 on the moving part 20 on both sides are as follows:

[0053] The left side is (L0-L1+A)K; the right side is 0;

[0054] The resultant force of the elastic elements 30 on both sides is (L0-L1+A)K=(L0-L1)K+AK;

[0055] It can be seen that, firstly, the resultant force of the elastic elements 30 on both sides during the movement of the moving part 20 is linear, and there is no sudden change in the resultant force. This makes the movement of the moving part 20 more stable, and thus enables the moving part 20 to be stably reset. Secondly, even if the movement distance A is very small, the resultant force of the elastic elements 30 on both sides is still (L0-L1)K+AK. When A is very small, its value is approximately equal to (L0-L1)K, which is the preload value. Therefore, even if the movement distance A is very small, the elastic element 30 still has a force of (L0-L1)K to push the moving part 20 to be stably reset (centering state).

[0056] In some embodiments, the elastic reset mechanism further includes a second limiting member 60, the fixed shaft 10 is provided with a second locking mounting groove 120, the second limiting member 60 can be locked in the second locking mounting groove 120, and the second limiting member 60 can restrict the elastic member 30 corresponding to itself to the side of the second limiting member 60 close to the first limiting member 40 so that it does not cross the second limiting member 60.

[0057] At this time, a first limiting member 40 is provided on one side of each elastic member 30, closer to the moving member 20, and a second limiting member 60 is provided on the other side of the elastic member 30. The elastic member 30 is restricted between the first limiting member 40 and the second limiting member 60 to achieve axial limiting of the elastic member 30. When the moving member 20 is not moving, the elastic member 30 has a preload. Different preloads can be obtained by selecting elastic members 30 with different elastic coefficients K, so that the preload of the reset mechanism can be adjusted while the moving member 20 can be stably reset. The preload is determined by the weight of the moving member 20, the weight of the object supporting the moving member 20, the friction of the ground, and other factors.

[0058] In some embodiments, the elastic reset mechanism further includes a second stop 70 disposed between the second limiting member 60 and the elastic member 30.

[0059] At this point, on both sides of each elastic element 30, a first stopper 50 and a first limiting element 40 are sequentially arranged on the side closer to the moving element 20, and a second stopper 70 and a second limiting element 60 are sequentially arranged on the other side of the elastic element 30. Stoppers are provided between both sides of the elastic element 30 and each limiting element. In this way, the force on the elastic element 30 can be more even, and it can also better adapt to the outer diameter of the elastic element 30.

[0060] In some embodiments, there are multiple second locking mounting slots 120. When the second limiting member 60 is locked in the second locking mounting slot 120 closer to the moving member 20, the compression amount of the elastic member 30 is greater.

[0061] like Figure 4 As shown, two second locking mounting slots 120 are respectively provided on both sides of the elastic member 30. When the elastic member 30 is locked in the second locking mounting slot 120 closer to the moving member 20, the elastic member 30 is in the first state L1. At this time, the compression of the elastic member 30 is large, so the preload of the elastic member 30 is large. When the elastic member 30 is locked in the second locking mounting slot 120 farther from the moving member 20, the elastic member 30 is in the second state L2. At this time, the compression of the elastic member 30 is small, so the preload of the elastic member 30 is small. That is to say, without changing the elastic coefficient K of the elastic member 30, the elastic member 30 can be locked in different second locking mounting slots 120, so that the elastic member 30 has different precompression and thus different preload.

[0062] Furthermore, the number of second locking mounting slots 120 is not limited in this application embodiment. For example, three second locking mounting slots 120 are provided on both sides of the elastic member 30, or four second locking mounting slots 120 are provided on both sides of the elastic member 30, or five second locking mounting slots 120 are provided on both sides of the elastic member 30. As long as the compression amount of the elastic member 30 is greater when the second limiting member 60 is locked in the second locking mounting slot 120 closer to the moving member 20, it is acceptable.

[0063] Therefore, the elastic reset mechanism provided in this application embodiment can combine various pre-pressures by changing the elastic coefficient K of the elastic element 30 and the pre-compression amount of the elastic element 30 to adapt to different scenario requirements. The pre-pressure is determined by factors such as the gravity of the moving element 20, the gravity of the object carried on the moving element 20, and the friction of the ground.

[0064] In summary, the elastic reset mechanism provided in this application has the advantages of adjustable pre-pressure, linear change of reset force, and the ability to provide a large reset force even with minor movements in the reset state (centering state); moreover, it has a simple structure, low cost, and is easy to install.

[0065] In some embodiments, such as Figure 1 and Figure 5 As shown, the elastic reset mechanism also includes a fixing member 80, which is disposed on the fixed shaft 10 and on the side of the elastic member 30 away from the moving member 20. That is, fixing members 80 are provided on both sides of the moving member 20, and the moving member 20 moves between the fixing members 80 on both sides. After the movement, the elastic member 30 provides a thrust to make the moving member 20 stably reset.

[0066] In some embodiments, such as Figure 1 and Figure 5 As shown, the elastic reset mechanism also includes a third limiting member 90. The fixed shaft 10 is provided with a third locking mounting groove 130. The third limiting member 90 can be locked in the third locking mounting groove 130. The third limiting member 90 can restrict the corresponding fixing member 80 to the side of the third limiting member 90 near the elastic member 30, preventing it from crossing the third limiting member 90. By setting the third locking mounting groove 130 and the third limiting member 90, the axial limitation of the fixed shaft 10 can be achieved. When the fixed shaft 10 moves to one side, it can be restricted by the third limiting member 90 on the other side, ensuring that the fixed shaft 10 will not move axially, thereby maintaining the positional stability of the elastic reset mechanism.

[0067] In some embodiments, the elastic element 30 includes at least one of a mechanical spring and a gas spring. The mechanical spring is a common spring, while the gas spring consists of the following parts: a pressure cylinder, a piston rod, a piston, a sealing guide sleeve, a filler (inert gas or an oil-gas mixture), an in-cylinder control element and an external control element (referring to a controllable gas spring), and a connector, etc. The principle is to fill the sealed pressure cylinder with inert gas or an oil-gas mixture, making the pressure inside the cavity several times or tens of times higher than atmospheric pressure. The piston rod moves by utilizing the pressure difference generated by the cross-sectional area of ​​the piston rod being smaller than that of the piston. Due to the fundamental difference in principle, the gas spring has significant advantages: relatively slow speed, small dynamic force variation, and easy control. The inert gas used for filling can be air, nitrogen, etc.

[0068] In some embodiments, such as Figure 6 As shown, the moving part 20 is provided with a second mounting hole 220 for connecting with the moving part. By installing the moving part into the second mounting hole 220, the moving part 20 can drive the moving part to move. Specifically, the second mounting hole 220 can be a threaded hole. A screw can be provided on the moving part. The screw is passed through the second mounting hole 220, and then the nut is tightened to install the moving part onto the moving part 20.

[0069] In some embodiments, such as Figure 6 As shown, the fixing member 80 is provided with a third mounting hole 810 for connection with the fixing part. By installing the moving part with the second mounting hole 220 and the fixing part with the third mounting hole 810, the elastic reset mechanism provided in this application embodiment can stably reset the moving part when it moves relative to the fixing part. Specifically, the third mounting hole 810 can be a threaded hole, and a screw can be provided on the fixing part. By passing the screw through the third mounting hole 810 and tightening the nut, the fixing part can be installed on the fixing member 80.

[0070] In some embodiments, the first limiting member 40, the second limiting member 60, and the third limiting member 90 are all elastic retaining rings of the same size, and the first stop member 50 and the second stop member 70 are both baffles of the same size.

[0071] The above description is merely a specific implementation of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the protection scope of this application.

Claims

1. A resilient return mechanism, characterised in that, include: The fixed shaft has a first mounting slot. A moving part is sleeved and slidably disposed along the fixed axis. The moving part is provided with a first mounting hole, and the fixed axis passes through the first mounting hole. An elastic element is sleeved on the fixed shaft, and the elastic element is provided on both sides of the moving member along the extension direction of the fixed shaft. The first limiting member can be locked in the first locking slot, and the first limiting member can restrict the elastic member corresponding to itself to one side of the first limiting member so that it does not cross the first limiting member. The first stop is disposed between the first limiting member and the elastic member; Wherein, along the radial direction of the fixed shaft, the radial dimension of the first mounting hole is greater than the outer diameter of the first limiting member and less than the outer diameter of the first stop member.

2. The elastic return mechanism of claim 1, wherein, The elastic reset mechanism further includes a second limiting member. The fixed shaft is provided with a second locking mounting groove. The second limiting member can be locked in the second locking mounting groove. The second limiting member can restrict the elastic member corresponding to itself to the side of the second limiting member close to the first limiting member and prevent it from crossing the second limiting member.

3. The elastic return mechanism of claim 2, wherein, The elastic reset mechanism further includes a second stop, which is disposed between the second limiting member and the elastic member.

4. The elastic return mechanism of claim 2, wherein, The number of the second locking slots is multiple. When the second limiting member is locked in the second locking slot closer to the moving member, the compression of the elastic member is greater.

5. The elastic return mechanism of claim 1, wherein, The elastic reset mechanism further includes a fixing member, which is disposed on the fixed shaft and on the side of the elastic member away from the moving member.

6. The elastic return mechanism of claim 5, wherein, The elastic reset mechanism further includes a third limiting member. The fixed shaft is provided with a third locking mounting groove. The third limiting member can be locked in the third locking mounting groove. The third limiting member can restrict the fixed member corresponding to itself to the side of the third limiting member close to the elastic member and prevent it from crossing the third limiting member.

7. The elastic return mechanism according to any one of claims 1 to 6, characterized in that The elastic element includes at least one of a mechanical spring and a gas spring.

8. The elastic return mechanism according to any one of claims 1 to 6, characterized in that The moving part is provided with a second mounting hole for connecting to the moving part.

9. A resilient return mechanism according to any one of claim 8, wherein, The fastener is provided with a third mounting hole for connection with the fixing part.

10. The elastic return mechanism according to any one of claims 1 to 6, characterized in that The first limiting member, the second limiting member, and the third limiting member are all elastic retaining rings of the same size, and the first stop and the second stop are both stop plates of the same size.

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