CN220540175U - Self-return mechanism - Google Patents

Abstract

The utility model discloses a self-return mechanism, which comprises a column body, a rod piece, at least one pair of movable pieces and an elastic piece, wherein the rod piece is arranged in the column body; one end of the rod piece penetrates out of the end part of the column body, and the rod piece can move along the extending direction of the column body; the movable pieces are movably connected with the rod piece, the two movable pieces in pairs are arranged along the extending direction of the column body, any one movable piece can move along the extending direction of the column body under the action of the rod piece, and the moving directions of the two movable pieces in pairs are opposite under the driving of the rod piece; the elastic piece is connected between the two movable pieces in the pair. The self-return mechanism is simple in structure, can generate the same self-return effect on the movement of the controlled object in different directions, and is stable and reliable in operation.

Description

Self-return mechanism

Technical Field

The utility model relates to the technical field of elastic devices, in particular to a self-return mechanism.

Background

Self-return mechanisms find wide application in a variety of devices. It is common to connect the return member to the spring, and utilize the spring to have a return force after deformation, so that the return member can be pulled back to an initial state by the spring.

In chinese patent No. CN207437652U, a linear bidirectional reset device is disclosed, by arranging two springs, when the movable rod moves towards different directions, one of the springs can be compressed correspondingly, so that the movable rod has a reset function in both directions. The structure is complex, in order to ensure that stable restoring force exists in each direction, and when the restoring force is equal under the same displacement in each direction, two springs are required to have the same performance, and the requirements on the springs are high.

Disclosure of Invention

In order to overcome the defects in the prior art, the embodiment of the utility model provides a self-return mechanism which is simple in structure, can generate the same self-return effect on the movement of a controlled object in different directions, and is stable and reliable in operation.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the self-return mechanism comprises a column body, a rod piece arranged in the column body, at least one pair of movable pieces and an elastic piece; one end of the rod piece penetrates out of the end part of the column body, and the rod piece can move along the extending direction of the column body; the movable pieces are movably connected with the rod piece, the two movable pieces in pairs are arranged along the extending direction of the column body, any one of the movable pieces can move along the extending direction of the column body under the action of the rod piece, and the moving directions of the two movable pieces in pairs under the drive of the rod piece are opposite; the elastic piece is connected between the two movable pieces in the pair.

In the two moving parts in the pair, when any one of the moving parts is positioned at the non-initial position due to the driving of the rod piece, the elastic part is in a deformation state, so that a reset force for enabling the moving part to return to the initial position is generated between the two moving parts in the pair, namely, the moving part is enabled to act on the rod piece in a counteraction mode, and the moving part is enabled to return to the initial position.

Through setting up the moving part of pair in the cylinder, connect the elastic component between two moving parts of pair, when the member is pulled out or is pressed into in the cylinder, one moving part that corresponds with the direction of motion in two moving parts of pair takes place to move, makes the elastic component take place deformation to produce restoring force, realize that member or the controlled object that links to each other with the member all have from the return function in different directions of motion. In addition, the movement directions of the two paired movable pieces are opposite, so that the elastic pieces generate the same deformation mode, the movement of the rod piece in different directions can provide the same compression amount or the same stretching amount, the same return effect is generated, and the mechanism is more stable and reliable.

Preferably, the return mechanism comprises two pairs of movable pieces. Typically, the number of moving parts may be set according to the use environment, the requirement, and the like. A plurality of pairs of movable pieces are arranged in the return mechanism, each pair of movable pieces is provided with an elastic piece, and the number of the elastic pieces in the return mechanism is increased. The reset force which needs to be overcome when the connecting rods move by the same distance is increased, so that the accurate and stable control is facilitated. When two pairs of movable pieces are included, the two pairs of movable pieces can be sequentially arranged along the extending direction of the column body. In order to make the return mechanism structure more compact and the volume smaller, two pairs of movable pieces can be arranged in a nested mode. Namely, two movable pieces positioned at two sides are arranged in pairs, and two movable pieces positioned at the middle are arranged in pairs.

In the column body, a limiting part is arranged corresponding to each movable part, and the limiting parts of the two movable parts in pairs are located at one side of the movable part, which faces away from the elastic part, or at one side of the movable part, which faces towards the elastic part. The limiting part is arranged to limit the moving direction of the movable part, so that the elastic part can realize the same deformation mode when the rod piece moves towards different directions. When in an initial position, the movable piece is contacted with the corresponding limiting part. Wherein, the state of contact includes: when the elastic piece is in an initial position, the elastic piece is in a non-deformation state, no restoring force acts between the movable piece and the elastic piece, and the surfaces of the movable piece and the limiting part are in a contact state under the condition of no acting force. Or when the elastic piece is in an initial position, the elastic piece is in a deformation state, including a compression state or a tension state, and the elastic piece pushes the movable piece to the limit part or pulls the movable piece to the limit part, so that the movable piece is in contact with the limit part.

The position of the limiting part can be determined according to the type of the elastic piece. When the elastic piece is a compression spring, the limiting part is positioned at one side of the movable piece, which is opposite to the elastic piece; when the elastic piece is an extension spring, the limiting part is positioned at one side of the movable piece, which faces the elastic piece. The compression spring is a spiral spring bearing axial pressure, a certain gap is reserved between the rings of the compression spring, and when external load is received, the spring contracts and deforms to store deformation energy. The extension spring is a coil spring which bears axial tension, and when the extension spring is not loaded, the coils of the extension spring are generally tightly connected without gaps.

Preferably, the cylinder is internally provided with a first cavity, and second cavities which are positioned at two ends of the first cavity and are communicated with the first cavity, the diameter of the second cavity is smaller than that of the first cavity, and a step-shaped limiting part is formed at the joint of the first cavity and the second cavity. Besides the limit part formed by processing the step part in the cylinder, limit blocks can be directly arranged in the cylinder along the radial direction, and a channel for rod movement is formed between the opposite limit blocks.

Preferably, the movable member is a sleeve member, and is sleeved on the rod member. The external member can be designed into cylindrical copper bush the center of copper bush be equipped with member assorted through-hole, make the copper bush can follow the member slides. One end of the copper sleeve is inwards recessed to form a groove for fixing the elastic piece. Besides the groove fixing elastic piece, a bulge can also be arranged, so that the elastic piece is sleeved on the bulge.

Preferably, a force receiving part is arranged on one side of the movable part facing the limiting part, and a pushing part matched with the force receiving part is arranged on the rod piece, so that the movable part is pushed away from the initial position by the pushing part when the rod piece moves. The stress part is designed into a plane structure, so that the processing is convenient. Further preferably, the movable member may be recessed inward to form a step structure on a side of the movable member facing the limiting portion, the step structure is used as a force receiving portion, and when the rod member drives the movable member to move, the pushing portion enters the step structure, so that the rod member is limited in a radial direction of the column body and moves in a preset direction, and shaking is avoided.

Preferably, the pushing part is a pushing block integrally formed with the rod piece and/or a nut in threaded connection with the rod piece. The pushing part is designed into a pushing block integrally formed with the rod piece, so that the subsequent assembly process can be reduced. The pushing part is designed into a nut in threaded connection with the rod piece, and nuts with different sizes can be replaced according to different cylinders.

Preferably, the outer side of at least one pushing part is contacted with the inner side of the cylinder to form sliding connection. The outside of the pushing part is contacted with the inside of the column body, so that the rod piece can be guided to move, and the rod piece is prevented from shaking. Further preferably, the outer side of the pushing part close to the opening of the column body is contacted with the inner side of the column body, and further preferably, the outer side of the pushing part close to the opening of the column body is contacted with the inner side of the column body, so that impurities can be prevented from entering the column body through the opening, and the stable operation of the mechanism is ensured.

Preferably, the cylinder comprises a base and a cylinder body sleeved on the base. The column body is designed to be of a detachable structure, so that the movable piece, the elastic piece and the like can be conveniently installed in the column body.

Connection portions may be provided on the column and at a portion of the rod extending out of the column. Under normal conditions, connecting parts are respectively arranged at two ends of the return mechanism, such as connecting holes, so that the return mechanism can be conveniently connected with a controlled object.

Due to the application of the technical scheme, compared with the prior art, the utility model has the following advantages:

1. through setting up the moving part of pair in the cylinder, connect the elastic component between two moving parts of pair, when the member is pulled out or is pressed into the cylinder, one moving part that corresponds with the direction of motion in two moving parts of pair takes place to remove, makes the elastic component take place deformation, produces restoring force, realizes from the return function. Because the movement directions of the two movable pieces are opposite, when the rod piece moves towards different directions, the same elastic piece generates the same deformation mode, the same movement amount of the rod piece in different directions can provide the same compression amount or the same stretching amount, the same self-return effect is generated, and the mechanism is more stable and reliable.

2. A plurality of pairs of movable pieces can be arranged in the column body, each pair of movable pieces can generate reset force on the rod piece, the plurality of reset forces act together, and larger reset force can be provided under the condition of small displacement, so that the use requirements of different devices are met.

3. The cylinder is internally provided with a pair of movable pieces and a limiting part, the movable pieces are connected with an elastic piece, the movable pieces are movably connected with the rod pieces, and when the rod pieces are pressed into or pulled out of the cylinder, the corresponding movable pieces are driven to move to generate a reset force, so that a self-reset function is formed.

The foregoing and other objects, features and advantages of the utility model will be apparent from the following more particular description of preferred embodiments, as illustrated in the accompanying drawings.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a self-return mechanism according to a first embodiment of the present utility model;

FIG. 2 is a schematic cross-sectional view illustrating an initial state of a self-returning mechanism according to a first embodiment of the present utility model;

FIG. 3 is a schematic cross-sectional view showing a state in which a rod is pressed into a cylinder according to an embodiment of the present utility model;

FIG. 4 is a schematic cross-sectional view showing a rod member pulled out of a cylinder according to an embodiment of the present utility model.

Reference numerals of the above drawings: 1. a column; 11. a base; 12. a cylinder; 101. a first cavity; 102. a second cavity; 103. a limit part; 21. a rod piece; 22. a pushing block; 23. a nut; 3. a movable member; 31. a first copper sleeve; 32. a second copper sleeve; 4. compressing the spring.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Embodiment one: referring to fig. 1 to 4, a self-return mechanism includes a column 1, a rod 21 disposed in the column 1, two movable members 3, and a compression spring 4 connected between the two movable members 3.

Referring to fig. 1, the cylinder 1 includes a base 11 and a cylinder 12 sleeved on the base 11. The two ends of the cylinder 12 are respectively provided with a first opening and a second opening. The rod 21 passes through the column 1 via a first opening, and the second opening is opposite to the base 11. When the self-return mechanism is assembled, the movable member 3, the compression spring 4, the rod 21, and the like can be fitted into the cylinder 12 from the second opening, and the second opening is sealed by the base 11. The end of the base 11 facing away from the cylinder 12 is provided with a connecting hole, and the cylinder 1 can be connected to equipment by using a pin shaft arranged in the connecting hole.

Referring to fig. 2, the column 1 has a first cavity 101 therein, and second cavities 102 located at both ends of the first cavity 101 and communicating with the first cavity 101, wherein the diameter of the second cavity 102 is smaller than that of the first cavity 101. The movable member 3 and the compression spring 4 are disposed in the first cavity 101. The connection part of the first cavity 101 and the second cavity 102 forms a step-shaped limit part 103. The limiting part 103 is used for limiting the movement of the movable part 3.

The rod 21 has a first end and a second end. The first end of the rod 21 extends into the cylinder 1 through a first opening in the cylinder 12 and into a second cavity 102 remote from the first opening. A nut 23 is screwed on said rod 21 near the first end, the diameter of said nut 23 matching that of said second cavity 102 remote from the first opening. The second end of the rod 21 is located outside the column 1. The second end of the lever 21 may be connected to the operating member via a knuckle bearing. A push block 22 is formed to protrude toward the peripheral side of the rod 21 near the second end, and the diameter of the push block 22 is matched with the second cavity 102 near the first opening. The nut 23 and the push block 22 are matched with the second cavity 102, so that the movement of the rod piece 21 is guided.

Referring to fig. 2 to 4, two movable members 3 are disposed in the first cavity 101 in opposition to each other along the extending direction of the column 1, and the two movable members 3 are located between the push block 22 and the nut 23. The movable part 3 is a cylindrical copper sleeve, and the diameter of the copper sleeve is matched with the inner diameter of the first cavity 101. The center of the copper sleeve is provided with a through hole matched with the rod piece 21, and the through hole is used for sleeving the movable piece 3 on the rod piece 21. A groove is formed on the copper bush, which is inwards recessed towards one side of the compression spring 4, and is used for fixing the compression spring 4. A force-bearing portion is disposed on a side of the copper sleeve facing the limiting portion 103, and is configured to contact with the push block 22 or the nut 23, so that the push block 22 or the nut 23 pushes the copper sleeve to move along the column 1. The first copper sleeve 31 corresponding to the push block 22 is recessed inward toward one side of the limit portion 103 to form a step structure matched with the push block 22, and the step structure is used as a force receiving portion. When the rod 21 drives the first copper sleeve 31 to move, the push block 22 enters the step structure, so that the rod 21 is further limited in the radial direction of the column 1, and moves in a preset direction to avoid shaking. A planar structure is arranged on one side, facing the limiting part 103, of the second copper bush 32 corresponding to the nut 23, and is matched with the end face of the nut 23, and the planar structure is used as a stress part, so that the processing is facilitated.

Referring to fig. 2, the self-return mechanism is in an initial state when the lever 21 is not subjected to an external force. In the initial state, the position of the movable member 3 is the initial position. In this state, the push block 22 of the rod 21 and the nut 23 are respectively located in the corresponding second cavity 102. The two copper sleeves are respectively contacted with the corresponding limiting parts 103.

Referring to fig. 3, when the rod 21 is subjected to axial pressure to press the rod 21 into the cylinder 1, the push block 22 on the rod 21 applies pressure to the first copper sleeve 31, and the pressure applied to the first copper sleeve 31 is greater than the restoring force applied to the first copper sleeve 31, so that the first copper sleeve 31 moves towards the second copper sleeve 32, and the first copper sleeve 31 is separated from its initial position. The second copper bush 32 is kept in a stationary state by the stopper 103, and is held in its corresponding initial position. The distance between the first copper bush 31 and the second copper bush 32 is reduced, the spring is compressed, and the generated restoring force is gradually increased. When the restoring force is greater than the pressure, the first copper sleeve 31 moves back to the second copper sleeve 32 under the restoring force until the first copper sleeve 31 returns to the initial position.

Referring to fig. 4, when the rod 21 receives an axial pulling force to pull the rod 21 out of the cylinder 1, the nut 23 on the rod 21 applies a pulling force to the second copper sleeve 32, and the pulling force received by the second copper sleeve 32 is greater than the restoring force received by the second copper sleeve 32, so that the second copper sleeve 32 moves toward the first copper sleeve 31, and the second cylinder 12 moves away from its initial position. The first copper bush 31 is kept in a stationary state by the stopper 103, and is held in its corresponding initial position. The distance between the second copper bush 32 and the first copper bush 31 is reduced, the spring is compressed, and the generated restoring force is gradually increased. When the restoring force is greater than the pulling force, the second copper sleeve 32 moves back to the first copper sleeve 31 under the action of the restoring force until the second copper sleeve 32 returns to the initial position.

Embodiment two: a self-retracting mechanism substantially similar in construction to the first embodiment, except that: four movable pieces are arranged in the column body, the four movable pieces are arranged in pairs, and the two pairs of movable pieces are distributed along the extending direction of the column body. Four limiting parts are arranged in the column body and four pushing parts are arranged on the rod piece. Through setting up two pairs of moving parts, increase restoring force satisfies different user demands.

Embodiment III: a self-retracting mechanism substantially similar in construction to the first embodiment, except that: the spring is an extension spring. The limiting part is arranged on one side, facing the extension spring, of the movable part, and the pushing part and the limiting part corresponding to the same movable part are positioned on the same side of the movable part. The extension spring is arranged between the limiting part and the pushing part, so that interference is avoided.

The principles and embodiments of the present utility model have been described in detail with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present utility model; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present utility model, the present description should not be construed as limiting the present utility model in view of the above.

Claims (10)

1. The self-return mechanism is characterized by comprising a column body, a rod piece, at least one pair of movable pieces and an elastic piece, wherein the rod piece, the at least one pair of movable pieces and the elastic piece are arranged in the column body; one end of the rod piece penetrates out of the end part of the column body, and the rod piece can move along the extending direction of the column body; the movable pieces are movably connected with the rod piece, the two movable pieces in pairs are arranged along the extending direction of the column body, any one of the movable pieces can move along the extending direction of the column body under the action of the rod piece, and the moving directions of the two movable pieces in pairs under the drive of the rod piece are opposite; the elastic piece is connected between the two movable pieces in the pair.

2. The self-return mechanism of claim 1 wherein: comprising two pairs of movable parts.

3. The self-return mechanism of claim 1 wherein: a limiting part is arranged in the column body corresponding to each movable piece, and the limiting parts of the two movable pieces in pairs are positioned at one side of the movable piece, which faces away from the elastic piece, or at one side of the movable piece, which faces towards the elastic piece; when in an initial position, the movable piece is contacted with the corresponding limiting part.

4. A self-return mechanism according to claim 3, wherein: when the elastic piece is a compression spring, the limiting part is positioned at one side of the movable piece, which is opposite to the elastic piece; when the elastic piece is an extension spring, the limiting part is positioned at one side of the movable piece, which faces the elastic piece.

5. A self-return mechanism according to claim 3, wherein: the cylinder is internally provided with a first cavity, and a second cavity which is positioned at two ends of the first cavity and communicated with the first cavity, wherein the diameter of the second cavity is smaller than that of the first cavity, and a step-shaped limiting part is formed at the joint of the first cavity and the second cavity.

6. The self-return mechanism of claim 1 wherein: the movable piece is a sleeve piece, and is sleeved on the rod piece.

7. A self-return mechanism according to claim 3, wherein: the movable piece is provided with a force bearing part on one side facing the limiting part, and a pushing part matched with the force bearing part is arranged on the rod piece, so that the movable piece is pushed away from the initial position by the pushing part when the rod piece moves.

8. The self-return mechanism of claim 7 wherein: the pushing part is a pushing block integrally formed with the rod piece and/or a nut in threaded connection with the rod piece.

9. The self-return mechanism of claim 7 wherein: the outer side of at least one pushing part is contacted with the inner side of the cylinder to form sliding connection.

10. The self-return mechanism of claim 1 wherein: the cylinder comprises a base and a cylinder body sleeved on the base.