CN114121519A - Bistable spring retaining device and working method thereof - Google Patents
Bistable spring retaining device and working method thereof Download PDFInfo
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- CN114121519A CN114121519A CN202111408709.1A CN202111408709A CN114121519A CN 114121519 A CN114121519 A CN 114121519A CN 202111408709 A CN202111408709 A CN 202111408709A CN 114121519 A CN114121519 A CN 114121519A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
- H01H3/38—Driving mechanisms, i.e. for transmitting driving force to the contacts using spring or other flexible shaft coupling
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
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Abstract
The invention discloses a bistable spring retaining device and a working method thereof, wherein the bistable spring retaining device comprises two connecting rods, two pistons, two first springs, two second springs and two piston cylinders; the two connecting rods have the same size, the front ends of the two connecting rods are hinged with each other, and the tail ends of the two connecting rods are respectively connected with the front ends of pistons; the two piston cylinders are identical in structure, the front ends of the two piston cylinders are symmetrically arranged, the two pistons are respectively arranged at the front ends of the two piston cylinders, the axial middle position of each piston cylinder is provided with a step surface, the step surface faces the rear end, the tail end of a first spring is connected with the front end of a corresponding second spring in series, the front end of the first spring is connected with the tail end of the corresponding piston, and the tail end of the second spring is connected with the tail end of the corresponding piston cylinder; the spring stiffness coefficient of the first spring is smaller than that of the second spring; the mechanism is provided with enough closing holding force, and state holding at the opening position of the mechanism is realized.
Description
Technical Field
The invention belongs to the field of mechanism transmission, and relates to a bistable spring retaining device and a working method thereof.
Background
The conventional bistable spring holding device has 1 or several pairs of cross springs uniformly distributed along the transmission rod, and springs or disc springs are arranged in a cylinder, and the compression amount of the springs or the disc springs is used for providing holding force.
The structure of the existing bistable spring holding device can ensure the opening and closing positions of the mechanism and provide enough closing holding force, but simultaneously brings new problems: 1. in the initial acceleration stage of the mechanism action, the holding force is used as resistance to reduce the acceleration of the transmission piece; 2. in the speed reduction and buffering stage of the mechanism, the force is kept to input energy into the transmission system, the movement speed of the transmission system is increased, and the buffering difficulty of the mechanism is increased; 3. the radial acting force of the steady-state spring on the transmission part increases the resistance of the rotating part, and the energy of the system is consumed.
Disclosure of Invention
The present invention is directed to overcome the above-mentioned disadvantages of the prior art, and to provide a bistable spring retaining device and a method for operating the same, which provides sufficient closing force to a mechanism and achieves state retention at the opening position of the mechanism.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a bistable spring retaining device comprises two connecting rods, two pistons, two first springs, two second springs and two piston cylinders;
the two connecting rods have the same size, the front ends of the two connecting rods are hinged with each other, and the tail ends of the two connecting rods are respectively connected with the front ends of pistons;
the two piston cylinders are identical in structure, the front ends of the two piston cylinders are symmetrically arranged, the two pistons are respectively arranged at the front ends of the two piston cylinders, the axial middle position of each piston cylinder is provided with a step surface, the step surface faces the rear end, the tail end of a first spring is connected with the front end of a corresponding second spring in series, the front end of the first spring is connected with the tail end of the corresponding piston, and the tail end of the second spring is connected with the tail end of the corresponding piston cylinder; the spring stiffness coefficient of the first spring is larger than that of the second spring;
the tail ends of the two piston cylinders are fixed, the sum of the lengths of the two connecting rods is larger than the distance between the front ends of the two piston cylinders and smaller than the distance between the tail ends of the two piston cylinders, and the two piston cylinders are positioned on a straight line after the two connecting rods rotate to the straight line;
when the first spring force value is equal to the second spring force value, the connecting rod is in a specific movement position or a position where the two springs move together, and the specific movement position is located between the opening/closing position and the position where the two connecting rods rotate to the straight line position.
Preferably, the end of the connecting rod is hinged to the piston.
Preferably, the tail ends of the two piston cylinders are hinged and fixed, and the connecting rod, the piston and the piston cylinder are coaxially connected.
Preferably, a driving rod is arranged between the two connecting rods, the driving rod is parallel to a straight line formed by connecting the two piston cylinders, and the front ends of the two connecting rods are hinged with the two ends of the driving rod.
Furthermore, a moving rod is arranged on the driving rod and is perpendicular to a straight line formed by connecting the two piston cylinders.
Preferably, a partition plate is arranged inside the piston cylinder, the diameter of the partition plate is larger than the inner diameter of the step surface, and the partition plate is located between the first spring and the second spring.
Furthermore, the piston cylinder is provided with the recess on the inner wall of baffle active area, and the recess sets up along baffle moving direction, is provided with the lug on the baffle global, and the lug stretches into in the recess and with recess sliding connection.
An operating method of the bistable spring holding device based on any one of the above items, comprising the following processes:
when the holding device moves downwards from the closed position and does not reach the specific movement position, the force value relationship of the spring is F2 ═ Fx > F1, and the force value of the first spring compressed by the piston is gradually increased; when a specific movement position is reached, F1 ═ F2 ═ Fx; the holding device continues to move downwards, when the piston continues to compress the spring under the driving of the connecting rod, the force value of the first spring tends to be larger than Fx, the piston continues to compress the spring in the following stage, the piston pushes the spring to move, the first spring and the second spring realize series synchronous motion, and the stiffness coefficient k of the series spring is k1 k2/(k1+ k2), k < k2< k1, k1 and k2 are the spring stiffness of the first spring and the second spring respectively; at this stage, the piston moves for the same distance S, and the spring force value relationship is k S < k 1S;
when the holding device is at a specific movement position close to the closed position, the force value F1 of the first spring is equal to the force value F2 of the second spring, when the holding device continues to move upwards, the compression amount delta of the first spring is reduced, F2 is equal to Fx > F1, Fx is the force value of the first spring and the second spring at the specific movement position, the moving direction acting force Fy of the middle position of the two connecting rods meets the requirement that the position holding force Fy is equal to 2F 2 tan theta, theta is the angle of the connecting rods rotating to the straight line with the two connecting rods at the moment, and the continuous movement reaches the closed position of the holding device;
when the two connecting rods rotate to a specific position close to the dislocation, F1 is F2 is Fx, when the connecting rods rotate downwards, the deformation amount of the piston compressing the first spring is reduced, at the moment, F2 is Fx is more than F1, only the first spring deforms, the acting force Fy of the moving direction of the middle position of the two connecting rods at the stage meets the position retaining force Fy of F2 tan theta, and finally the retaining device reaches the dislocation;
the process of moving the holding device from the open position to the closed position is the same as described above.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides enough closing holding force for the mechanism through the compression spring and realizes the state holding when the mechanism is in the opening position. First spring and second spring separator establish ties, and the series connection of spring is used and can be reduced spring stiffness coefficient to greatly reduced motion in-process spring force value's growth rate reduces the resistance of middle transmission process when guaranteeing that the state holding power value is sufficient. Compared with the existing mechanism, more system energy is converted into kinetic energy at the initial stage of starting the connecting rod, so that the movement speed of the connecting rod is convenient to improve, the conversion input of the energy is reduced at the braking stage of the moving rod, the braking of the movement of the connecting rod is convenient, and the use efficiency of the system energy is improved.
Furthermore, the arrangement of the partition plate can realize the switching of the input and exit functions of the second spring in the movement process, thereby ensuring that the lowest threshold value of the balance position of the spring limits the maximum value of the spring in the movement process.
Furthermore, the convex block is connected with the groove in a sliding mode, and the partition plate is limited.
Drawings
FIG. 1 is a schematic diagram of a bistable spring retainer device of the present invention;
fig. 2 is a schematic view of a piston cylinder and a partition plate of the present invention.
Wherein: 1-a motion bar; 2-a connecting rod; 3-a piston; 4-a first spring; 5-a separator; 6-a second spring; 7-a piston cylinder; 8-a pin; 9-driving rod.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
as shown in fig. 1, the bistable spring holding device according to the present invention includes a driving rod 9, a moving rod 1, two connecting rods 2, a piston 3, a first spring 4, a second spring 6, a partition plate 5, and two piston cylinders 7.
The two connecting rods 2 have the same size, and the tail ends of the two connecting rods are respectively connected with a piston 3 through pins 8; a driving rod 9 is arranged between the two connecting rods 2, the driving rod 9 is parallel to a straight line formed by connecting the two piston cylinders 7, and the front ends of the two connecting rods 2 are hinged with the two ends of the driving rod 9; the driving rod 9 is provided with a moving rod 1, and the moving rod 1 is perpendicular to a straight line formed by connecting the two piston cylinders 7.
The two piston cylinders 7 are identical in structure, the front ends of the two piston cylinders are oppositely arranged, the second spring 6, the partition plate 5 and the first spring 4 are sequentially arranged in the piston cylinders 7, the two pistons 3 are respectively arranged at the front ends of the two piston cylinders 7, step surfaces are arranged at the axial middle positions of the piston cylinders 7, the step surfaces face the rear ends, the partition plate 5 is positioned in the piston cylinders 7, the diameter of the partition plate 5 is larger than the inner diameter of the step surfaces, the two ends of the first spring 4 are connected with the pistons 3 and the front ends of the partition plate 5, and the second spring 6 is connected with the rear ends of the partition plate 5 and the tail ends of the piston cylinders 7; as shown in figure 2, the piston cylinder 7 is provided with a U-shaped groove, the partition plate 5 is provided with a circular convex block, and the partition plate 5 can move in the piston cylinder 7 along the U-shaped groove within a certain range.
The tail ends of the two piston cylinders 7 are fixed or hinged, and when the tail ends of the two piston cylinders 7 are fixed, the tail end of the connecting rod 2 is hinged with the piston 3; when the tail ends of the two piston cylinders 7 are hinged and fixed, the connecting rod 2, the piston 3 and the piston cylinder 7 are coaxially connected.
The sum of the lengths of the two connecting rods 2 and the moving rod 1 is larger than the distance between the front ends of the two piston cylinders 7 and smaller than the distance between the tail ends of the two piston cylinders 7, the positions of the two connecting rods 2 and the moving rod 1 which rotate to the straight line are middle positions or dead positions, and the two piston cylinders 7 are positioned on the straight line of the middle positions.
The spring stiffness coefficient of the first spring 4 is larger than that of the second spring 6; when the force value of the first spring 4 is equal to the force value of the second spring 6, the connecting rod 2 is at a specific movement position or a position where the two springs move together, and the specific movement position is located between the opening and closing position and the middle position.
As shown in figure 1, the motion rod 1 moves downwards to drive the piston 3 to realize linear reciprocating motion through the connecting rod 2, the piston 3 compresses the first spring 4 during motion, the input and exit function switching is realized at different positions by the partition plate 5 and the second spring 6 along with the change of the compression amount and the force value of the first spring 4, the stiffness coefficient of the spring system is changed along with the input and exit function switching of the second spring 6 in the motion process of the piston 3, and finally the force value applied to the piston 3 by the spring system is changed.
As shown in fig. 1, the design is initially that, at the distance mechanism switching-on position Δ X, i.e. the specific movement position, by setting the stiffness coefficients K of the first spring 4 and the second spring 6 and locating the partition plate 5 at the position inside the U-shaped groove of the piston cylinder 7, the force value F1 of the first spring 4 is equal to the force value F2 of the second spring 6, i.e. setting the spring stiffness coefficients K1 > K2 and the spring deformation amount Δ 1 < Δ 2, so that F1 ═ F2 ═ Fx, and Fx is the force value of the first spring 4 and the second spring 6 at the specific movement position.
As shown in fig. 1, when the holding device moves downwards from the closed position and does not reach the specific movement position, the force value relationship of the spring is F2 ═ Fx > F1, and the force value of the piston 3 compressing the first spring 4 is gradually increased; when a specific movement position is reached, F1 ═ F2 ═ Fx; the holding device continues to move downwards, when the piston 3 continues to compress the spring under the drive of the connecting rod 2, the force value of the first spring 4 tends to be larger than Fx, the piston 3 continues to compress the spring in the following stage, the piston 3 pushes the spring to move, the first spring 4 and the second spring 6 realize series synchronous motion, the stiffness coefficient k of the series spring is k1 k2/(k1+ k2), k2< k1, and k1 and k2 are the spring stiffness of the first spring 4 and the second spring 6 respectively; at this stage, the piston 3 moves the same distance S, and the spring force value relationship is k × S < k1 × S;
when the holding device is at a specific movement position close to the closed position, the force value F1 of the first spring 4 is equal to the force value F2 of the second spring 6, when the holding device continues to move upwards, the compression amount delta of the first spring is reduced, F2 is Fx > F1, Fx is the force value of the first spring 4 and the second spring 6 at the specific movement position, the moving direction acting force Fy of the middle position of the two connecting rods 2 meets the requirement that the position holding force Fy is 2F 2 tan theta, theta is the angle of the connecting rod 2 rotating to the straight line with the two connecting rods 2 at the moment, and the holding device continues to move to the closed position;
when the two connecting rods 2 rotate to a specific position close to the indexing position, F1 is F2 is Fx, when the connecting rods 2 rotate downwards again, the deformation amount of the piston 3 for compressing the first spring 4 is reduced, at the moment, F2 is Fx > F1, only the first spring 4 deforms, and in this stage, the acting force Fy in the moving direction of the middle position of the two connecting rods 2 meets the position holding force Fy of F2 tan theta, and finally the holding device reaches the indexing position;
the process of moving the holding device from the open position to the closed position is the same as described above.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (8)
1. A bistable spring retaining device is characterized by comprising two connecting rods (2), two pistons (3), two first springs (4), two second springs (6) and two piston cylinders (7);
the two connecting rods (2) have the same size, the front ends of the two connecting rods are hinged with each other, and the tail ends of the two connecting rods are respectively connected with the front ends of pistons (3);
the two piston cylinders (7) are identical in structure, the front ends of the two piston cylinders are symmetrically arranged, the two pistons (3) are respectively arranged at the front ends of the two piston cylinders (7), the axial middle positions of the piston cylinders (7) are provided with step surfaces facing the rear ends, the tail ends of the first springs (4) are connected with the front ends of the corresponding second springs (6) in series, the front ends of the first springs (4) are connected with the tail ends of the corresponding pistons (3), and the tail ends of the second springs (6) are connected with the tail ends of the corresponding piston cylinders (7); the spring stiffness coefficient of the first spring (4) is larger than that of the second spring (6);
the tail ends of the two piston cylinders (7) are fixed, the sum of the lengths of the two connecting rods (2) is larger than the distance between the front ends of the two piston cylinders (7) and smaller than the distance between the tail ends of the two piston cylinders (7), and the two piston cylinders (7) are positioned on a straight line after the two connecting rods (2) rotate to the straight line;
when the force value of the first spring (4) is equal to the force value of the second spring (6), the connecting rod (2) is at a specific movement position or a position where the two springs move together, and the specific movement position is located between the opening/closing position and the position where the two connecting rods (2) rotate to the straight line position.
2. Bistable spring-retaining device according to claim 1, characterized in that the end of the connecting rod (2) is hinged to the piston (3).
3. Bistable spring-retaining device according to claim 1, characterized in that the ends of the two piston cylinders (7) are fixed in an articulated manner, the connecting rod (2), the piston (3) and the piston cylinder (7) being coaxially connected.
4. The bistable spring retaining device according to claim 1, characterized in that a drive rod (9) is arranged between the two connecting rods (2), the drive rod (9) is parallel to the line connecting the two piston cylinders (7), and the front ends of the two connecting rods (2) are hinged to the two ends of the drive rod (9).
5. The bistable spring-retaining device according to claim 4, characterized in that the drive rod (9) is provided with a motion rod (1), the motion rod (1) being perpendicular to the line connecting the two piston cylinders (7).
6. The bistable spring retaining device according to claim 1, wherein the piston cylinder (7) is internally provided with a partition (5), the diameter of the partition (5) being greater than the inner diameter of the step surface, the partition (5) being located between the first spring (4) and the second spring (6).
7. A bistable spring retaining device according to claim 6, wherein the piston cylinder (7) is provided with recesses on the inner wall of the active area of the partition (5), the recesses being arranged in the direction of movement of the partition (5), and projections being provided on the circumferential surface of the partition (5), the projections extending into the recesses and being slidably connected thereto.
8. A method of operating a bistable spring-retaining device according to any of claims 1 to 7, comprising the steps of:
when the holding device moves downwards from the closed position and does not reach a specific movement position, the force value of the spring is in a relationship of F2 ═ Fx > F1, and the force value of the piston (3) compressing the first spring (4) is gradually increased; when a specific movement position is reached, F1 ═ F2 ═ Fx; the holding device continues to move downwards, the force value of the first spring (4) tends to be larger than Fx when the piston (3) continues to compress the spring under the driving of the connecting rod (2), the piston (3) continues to compress the spring at the later stage, the piston (3) pushes the spring to move, the first spring (4) and the second spring (6) realize series synchronous motion, the stiffness coefficient k of the series spring is k1 k2/(k1+ k2), k < k2< k1, and k1 and k2 are the spring stiffness of the first spring (4) and the second spring (6) respectively; in this stage, the piston (3) moves the same distance S, and the spring force value relationship is k S < k 1S;
when the holding device is at a specific movement position close to the closed position, the force value F1 of the first spring (4) is equal to the force value F2 of the second spring (6), when the holding device continues to move upwards, the compression amount delta of the first spring is reduced, F2 is Fx > F1, Fx is the force value of the first spring (4) and the second spring (6) at the specific movement position, the moving direction acting force Fy of the middle position of the two connecting rods (2) meets the requirement that the position holding force Fy is 2F 2 tan theta, theta is the angle of the connecting rods (2) rotating to the straight line at the moment, and the continuous movement reaches the closed position of the holding device;
when the two connecting rods (2) rotate to a specific position close to the dislocation, F1 is F2 is Fx, when the connecting rods (2) rotate downwards again, the deformation amount of the piston (3) compressing the first spring (4) is reduced, at the moment, F2 is Fx > F1, only the first spring (4) deforms, and at the stage, the acting force Fy of the moving direction of the middle position of the two connecting rods (2) meets the position holding force Fy of F2 tan theta, and finally the holding device reaches the dislocation;
the process of moving the holding device from the open position to the closed position is the same as described above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111408709.1A CN114121519B (en) | 2021-11-24 | 2021-11-24 | Bistable spring retaining device and working method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111408709.1A CN114121519B (en) | 2021-11-24 | 2021-11-24 | Bistable spring retaining device and working method thereof |
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| CN114121519A true CN114121519A (en) | 2022-03-01 |
| CN114121519B CN114121519B (en) | 2023-06-20 |
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| Publication number | Publication date |
|---|---|
| CN114121519B (en) | 2023-06-20 |
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