CN117739051A - Rebound-free constant force mechanism, buffer device and launching device - Google Patents

Abstract

The invention relates to the field of impact mechanics, and provides a rebound-free constant force mechanism, a buffer device and a transmitting device, wherein the rebound-free constant force mechanism comprises: support the shell: the two ends are respectively a closed end and an open end, and a control valve is arranged outside the closed end; one end of the force transmission body is connected with the piston end, the piston end is slidably arranged in the support shell and forms a closed space with the closed end, the other end of the force transmission body is connected with the functional end, and the functional end is positioned outside the support shell; the controller is in signal connection with the control valve, when the control valve is opened, the closed space is communicated with the external atmosphere, and the impact energy is counteracted by utilizing the support shell and the piston end to form the closed space.

Description

Rebound-free constant force mechanism, buffer device and launching device

Technical Field

The invention relates to the field of impact mechanics, in particular to a rebound-free constant force mechanism, a buffer device and a transmitting device.

Background

The cushioning means are various in the manner that the spring cushioning means can cushion the impact carrier but cannot prevent the spring from rebounding. Buffering the impact carrier reduces carrier damage, but the resilience force of the spring is likely to damage the impact and the impacted carrier, so that unsafe and uncertain conditions exist, and the dissipation of the resilience force of the spring takes time and cannot be instantaneously dissipated. Friction energy dissipation buffering is also often used, which is realized by friction heat generation but has loss to materials, and heat dissipation also needs time and cannot be instantaneously dissipated, so how to design a buffering device capable of enabling energy to be instantaneously dissipated is particularly important.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a rebound-free constant force mechanism, a buffer device and a transmitting device.

According to the invention, there is provided a rebound-free constant force mechanism comprising:

support the shell: the two ends are respectively a closed end and an open end, and a control valve is arranged outside the closed end;

one end of the force transmission body is connected with the piston end, the piston end is slidably arranged in the support shell and forms a closed space with the closed end, and a stress part is arranged at the part of the force transmission body extending to the outside of the support shell; or the other end of the force transmission body extends to the outside of the support shell and is connected with a functional end, and the functional end is a stress part;

and the controller is in signal connection with the control valve, and when the control valve is opened, the closed space is communicated with the external atmosphere.

Preferably, a vacuum pump is connected to the outside of the control valve.

Preferably, the support housing is capable of being configured to operate in a stressed environment in any posture.

According to the invention, the buffer device comprises one or more rebound-free constant force mechanisms, when the functional end receives external impact force, the functional end can drive the piston end to move towards the opening end, the volume of the closed space is gradually increased until the impact force is counteracted, and the control valve is opened.

Preferably, the force transmitting body is a force transmitting rod.

Preferably, the device comprises a support frame connected with a plurality of rebound-free constant force mechanisms and a flexible layer arranged outside the functional ends of the rebound-free constant force mechanisms, wherein the flexible layer is of a spherical structure, and the axle center of each support shell passes through the circle center of the spherical structure.

According to the launching device provided by the invention, the launching device is used for launching the projectile body through the stress part, and comprises one or more rebound-free constant force mechanisms, when the piston end moves towards the closed end under the action of external atmospheric pressure, the stress part of the force transmission body can be driven to move, so that the volume of the closed space is gradually reduced until the projectile body is launched, and at the moment, the control valve is opened.

Preferably, the force transmitting body is a cable.

Preferably, the device comprises two rebound-free constant force mechanisms, one end of the cable is connected with a piston end in one rebound-free constant force mechanism, the other end of the cable is connected with a piston end in the other rebound-free constant force mechanism, and the middle part of the cable is positioned outside the supporting shell and becomes a stress part of the launching device.

Preferably, the cross-sectional areas of the respective support housings in the plurality of rebound-free constant force mechanisms are all different, partially identical or all different.

Compared with the prior art, the invention has the following beneficial effects:

the invention uses the structure that the supporting shell and the piston end form a closed space to form a negative pressure space to counteract impact energy or provide energy for emission, finally, the impact energy or the emission energy is counteracted by opening the control valve, finally, the effect of instant energy release when the vacuum space is communicated with the outside is obtained, the problem that the energy is absorbed by adopting other modes such as springs, friction and the like in the prior art and the defect is overcome, and the invention achieves the effect of millisecond-level energy release. Meanwhile, in the process of buffering or transmitting, the energy dissipation depends on external atmospheric pressure which is constant, so that the device is a device which is stable and does not change with space distance and time and counteracts the energy by constant damping force, has the advantages of simple structure, convenient operation, low cost, capability of being applied to various scenes and good universality.

Drawings

Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:

FIG. 1 is a schematic diagram of a structure of a rebound-free constant force mechanism;

FIG. 2 is a schematic diagram of the motion process after the impact of the rebound-free constant force mechanism;

FIG. 3 is a schematic diagram showing the force applied to the piston end when the enclosed space is in a vacuum state;

FIG. 4 is a schematic diagram of the force applied to the piston end after the enclosed space is filled with air;

FIG. 5 is a schematic structural diagram of a buffer device in embodiment 2, wherein the closed space is a vacuum space;

fig. 6 is a schematic structural diagram of a buffer device in embodiment 2, wherein the closed space is filled with air;

FIG. 7 is a schematic diagram of a buffer device in embodiment 3;

fig. 8 is a schematic view of the structure of the piston end in the initial state in embodiment 4;

FIG. 9 is a schematic view of the structure of the piston end of the embodiment 4 between the first position and the second position, wherein the closed space is a vacuum space;

fig. 10 is a schematic view showing a structure in which the piston end is between the first position and the second position in embodiment 4, in which the closed space is filled with the atmosphere.

The figure shows:

support housing 1

Closed end 11

Open end 12

Enclosed space 13

Force transmission body 2

Piston end 21

Functional end 22

Control valve 3

Cable 4

Fixed pulley 5

Support frame 6

Flexible layer 7

Elastomer 8

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present invention.

Example 1:

the invention provides a rebound-free constant force mechanism, which comprises a support shell 1, a force transmission body 2 and a controller, wherein the force transmission body 2 is a force transmission rod, two ends of the support shell 1 are respectively provided with a closed end 11 and an open end 12, one end of the force transmission body 2 is connected with a piston end 21, the piston end 21 is slidably arranged inside the support shell 1 and forms a closed space 13 with the closed end 11, a control valve 3 is arranged outside the closed end, the control valve 3 is preferably an electromagnetic valve, and when the control valve 3 is opened, the closed space 13 is communicated with the outside atmosphere. The other end of the force transmission body 2 extends to the outside of the support shell 1 and is connected with a functional end 22, and the functional end 22 is a stress part.

The piston end 21 in this embodiment is movable between a first position, where the volume of the closed space 13 is the smallest, and a second position, where the maximum stroke of the piston end 21, where the volume of the closed space 13 is the largest, in the initial state.

The invention also provides a buffer device which comprises one or more rebound-free constant force mechanisms, wherein the cross sectional areas of the supporting shells 1 in the rebound-free constant force mechanisms can be designed to be different, partially identical or different, and the rebound-free constant force mechanisms can be flexibly selected according to practical application scenes. When the functional end 22 receives an external impact force, the piston end 21 can be driven to move towards the opening end 12, the volume of the closed space 13 is gradually increased until the impact energy is counteracted, at this time, the control valve 3 is opened, and the movement trend of the piston end 21 in the direction is relieved. Specifically, when the device is impacted, the impact force acts on the stress part, namely, acts on the functional end 22, after the impact force acts on the functional end 22, the functional end 22 enables the piston end 21 to move towards the opening end 12 through the force transmission body 2, work is done against negative pressure in the movement process of the piston end 21, as shown in fig. 2, until the impact force is completely counteracted, at the moment, the piston end 21 is between the first position and the second position or the piston end 21 is moved to the second position, when the movement speed of the functional end 22 becomes 0, the impact energy is absorbed by the device, at the moment, because the inside of the closed space 13 is still a vacuum space, as shown in fig. 2 c and 3, the piston end 21 is driven to return to the first position under the driving of the external atmospheric pressure, at the moment, the controller controls the control valve 3 to open, the external atmospheric pressure can rapidly enter the vacuum space through the control valve 3, as shown in fig. 4, the pressure in the closed space 13 is rapidly increased to the same pressure as the external atmospheric pressure, the negative pressure can be completely released, and the trend that the piston end 21 returns to the first position is completely relieved. The invention firstly utilizes the mechanism that the impact energy is gradually dissipated by utilizing the negative pressure energy of the negative pressure space and then the vacuum space is communicated with the outside through opening the control valve 3, thereby solving the problem that the buffer mode of a spring or friction is adopted in the prior art to have defects. Meanwhile, in the buffering process, the impact absorbing force depends on external atmospheric pressure, and the atmospheric pressure is constant, so the invention also provides a device for absorbing the impact energy by stabilizing constant damping force which does not change along with space distance and time.

The movement state of the piston end 21 in the support housing 1 is related to the opening or closing timing of the control valve 3 during the impact operation, and when the piston end 21 fully counteracts the impact energy, the control valve 3 is triggered to open, or the movement position of the piston end 21 is detected by a sensor, and when the piston end 21 reaches the set position, the sensor sends a position signal to a controller, and the controller controls the control valve 3 to open. The amount of impact energy can be counteracted by the invention is determined by the stroke of the piston end 21 and the cross-sectional area of the support shell 1, the larger the cross-sectional area is, the longer the stroke is, the larger the impact energy can be counteracted, and the invention can be flexibly designed according to specific application scenes so as to meet the requirements of actual products.

In practical application, support casing 1 can be configured in the impact environment with arbitrary gesture and work, and at the during operation, support casing 1 can be put flat, also can vertically place, still can incline to place, all can not influence the impact effect, has improved the commonality of device greatly.

The outside of the control valve 3 is connected with a vacuum pump, when the impact operation is completed, the vacuum pump is started to pump out the air in the closed space 13 and close the control valve 3, at this time, the interior of the closed space 13 becomes a vacuum space, under the action of the external atmospheric pressure, the piston end 21 moves towards the closed end 11 of the support shell 1 until reaching the end part, at this time, the closed space 13 is a vacuum space, the device returns to the initial state, and the impact buffering operation can be performed again. The invention can be applied to various buffer environments, has good stability, can be repeatedly used, has no defects of abrasion, heating, rebound and the like of parts, and greatly prolongs the service life of the device.

The functional end 22 in the invention can be provided with the elastic medium 221, the force transmission body 2 can be protected from damage through the elastic medium 221, a good protection effect is achieved, and when the elastic medium 221 is damaged, the elastic medium 221 can be replaced, so that the main body of the force transmission body 2 is not damaged, and the service life of the device can be prolonged.

Example 2:

the embodiment is a preferred embodiment of embodiment 1, and this embodiment provides a buffering device, as shown in the dashed line part in fig. 5 and 6, including two non-rebound constant force mechanisms, the force transmission body 2 in the two non-rebound constant force mechanisms adopts a cable 4, one end of the cable 4 is connected with the piston end 21 in one non-rebound constant force mechanism, the other end of the cable 4 is connected with the piston end 21 in the other non-rebound constant force mechanism, the middle part of the cable 4 is a stress part and becomes an impact position of the buffering device, the middle part of the cable 4 is located outside the supporting shell 1 and is in an inverted V-shaped structure, and the application of different impact positions and directions of the buffering device can be realized through the cable 4 and the fixed pulley 5. The top of each rebound-free constant force mechanism is provided with a fixed pulley 5, two ends of the cable 4 are respectively connected with corresponding piston ends 21 through the opening ends of the two rebound-free constant force mechanisms, the middle of the cable 4 is a stressed part of impact, the impact buffering effect is realized, and the fixed pulley can be applied to the scene related to drag reduction, such as a blocking cable and the like.

In practical applications, a plurality of fixed pulleys 5 may be further configured to change the direction of force, so as to match different impact resistance reducing positions, directions or positions, as shown by solid line portions in fig. 5 and 6.

Example 3:

the present embodiment is another preferred embodiment of embodiment 1, and the present embodiment constructs a buffering device with a spherical structure, and when the buffering device works, at least one functional end 22 of the rebound-free constant force mechanism receives an impact, as shown in fig. 7, and the buffering device comprises a support frame 6 connected with a plurality of rebound-free constant force mechanisms and a flexible layer 7 arranged outside the functional ends 22 of the rebound-free constant force mechanisms, wherein the flexible layer 7 has a spherical structure, the axle center of each support housing 1 passes through the center of the spherical structure, and the buffering device in the present embodiment can buffer the impact from all directions, and the impact force is transferred to the flexible layer 7 and then transferred to the functional end 22, thereby realizing the buffering of the impact force.

It should be noted that, the present embodiment may also be designed to be a non-spherical structure, for example, the functional end 22 of each support housing 1 has a long and short structure; for example, the present invention is also configured to protect the shaft center portion from crossing or not crossing.

Example 4:

the present embodiment is a variation of embodiment 1, and provides a launching device, which is used for launching a projectile body 8, and ejects the projectile body 8 through a stress part, and includes one or more non-rebound constant force mechanisms, when the piston end 21 moves towards the closed end 11 under the action of external atmospheric pressure, the stress part can drive the stress part of the force transmission body 2 to move, the stress part pushes the projectile body 8 to launch, the stress part continuously applies a constant thrust to the projectile body 8, and when the projectile body 8 reaches a set speed or applies the thrust for a period of time, the controller directly controls the control valve 3 to open, for example, when the thrust is applied for 5 seconds, air enters the closed space 13 at this time, so that the thrust pushing the piston end 21 to move disappears, the piston end 21 is made of a light material, and the piston end 21 with a certain speed is quickly stopped due to the friction force between the piston end 21 and the support housing 1, finally the projectile body 8 with a certain speed is released from the stress part and launched by inertia, and in this process, the volume of the closed space 13 is gradually reduced.

The force transmitting body 2 in this embodiment is a cable 4. Unlike embodiment 2, the force receiving portion in this embodiment is provided on the cable 4, and the ejection direction of the force receiving portion on the force transmitting body 2 is opposite to the movement direction of the piston end 21.

Further, the piston end 21 is movable between a third position, which is a position of the piston end 21 in the initial state, at or near the maximum volume of the closed space 13 as shown in fig. 8, and a fourth position, which is a position at which the piston end 21 moves to the maximum stroke, that is, a position at or near 0 of the closed space 13; the stress part of the cable 4 is an ejection position, the projectile body 8 is placed at the ejection position, before the ejection operation starts, the piston end 21 is in an initial position, the piston end 21 has a movement trend of being pushed to a fourth position by atmospheric pressure, and as the middle part of the cable 4 is locked by the locking mechanism, the energy is in a state of being stored and not released, and the locking mechanism can be in a holding clamp or other structures capable of locking the middle part of the cable 4. When the ejection operation starts, the locking mechanism is unlocked, the piston end 21 is driven to move towards the fourth position under the driving of atmospheric pressure so as to drive the cable 4 to move, the stressed part of the cable 4 pushes the projectile body 8 to move, the speed of the piston end 21 is faster and faster in the process of launching the projectile body 8, as shown in fig. 9, at the moment, the controller controls the control valve 3 to be opened, the projectile body 8 is ejected, the piston end 21 is positioned between the third position and the fourth position, at the moment, the airtight space 13 is filled with air, the force for pushing the piston end 21 to move towards the fourth position disappears, the movement trend of the piston end 21 is released instantaneously, as shown in fig. 10, the movement trend of the piston end 21 is released rapidly, and the whole device is more stable.

It should be noted that, in this embodiment, the piston end 21 needs to overcome the negative pressure to do work from the fourth position to the third position, so that external force is needed to participate in the operation, in order to reduce the complexity of the device, when the piston end 21 is located at the fourth position, the control valve 3 is opened first, the closed space 13 is communicated with the external atmosphere, no large external force is needed from the fourth position to the third position of the piston end 21, after the piston end 21 reaches the third position, the middle part of the cable 4 is locked by the locking mechanism, then the vacuum pump is started to start vacuumizing the closed space 13, and after the closed space 13 reaches the corresponding vacuum degree, the controller controls the control valve 3 to be closed, and the piston end 21 is in the initial state.

The transmitting device has better stability, and compared with the transmitting device in the prior art, the transmitting device in the invention realizes constant force transmission under the condition of attenuation.

Taking example 1 as an example, the working principle of the invention is as follows:

in the initial state, the control valve 3 is in a closed state, when the functional end 22 is impacted by external force, the force is transmitted to the piston end 21 through the force transmission body 2, so that the piston end 21 can be driven to move towards the opening end 12 of the support shell 1, the volume of the closed space 13 gradually becomes larger in the moving process, negative pressure is overcome to apply work in the moving process of the piston end 21, and the impact energy is absorbed by the device until the moving speed of the functional end 22 becomes 0. Since the inside of the closed space 13 is still a vacuum space at this time, as shown in fig. 3, there is a tendency that the sealed end is returned to the original state, the controller controls the control valve 3 to be opened, and the external atmosphere can be rapidly introduced into the vacuum space through the control valve 3, as shown in fig. 4, so that the pressure in the closed space 13 is rapidly increased to the same pressure as the external atmosphere, and the negative pressure can be completely released.

The rebound-free constant force mechanism of the invention can be a disposable device or can be designed as a reusable device, when the rebound-free constant force mechanism is applied to the reusable device, the vacuum pump is connected to the outside of the control valve 3, the piston end 21 is positioned between the first position and the second position after the impact energy is absorbed, at the moment, the control valve 3 is opened and the vacuum pump is started, the control valve 3 is closed after the closed space 13 is pumped to a vacuum state, and the piston end 21 is driven to return to the first position again under the driving of the external atmospheric pressure so as to be ready for receiving the next impact buffering action.

In the description of the present application, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements being referred to must have a specific orientation, be configured and operated in a specific orientation, and are not to be construed as limiting the present application.

The foregoing describes specific embodiments of the present invention. It is to be understood that the invention is not limited to the particular embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without affecting the spirit of the invention. The embodiments of the present application and features in the embodiments may be combined with each other arbitrarily without conflict.

Claims (10)

1. A rebound-free constant force mechanism comprising:

support housing (1): two ends are respectively a closed end (11) and an open end (12), and a control valve (3) is arranged outside the closed end;

one end of the force transmission body (2) is connected with the piston end (21), the piston end (21) is slidably arranged in the support shell (1) and forms a closed space (13) with the closed end (11), and a stress part is arranged at the part of the force transmission body (2) extending to the outside of the support shell (1); or the other end of the force transmission body (2) extends to the outside of the support shell (1) and is connected with the functional end (22), and the functional end (22) is a stress part;

and the controller is in signal connection with the control valve (3), and when the control valve (3) is opened, the closed space (13) is communicated with the external atmosphere.

2. The rebound-free constant force mechanism of claim 1, wherein a vacuum pump is connected to the outside of the control valve (3).

3. The rebound-free constant force mechanism of claim 1, wherein the support housing (1) is configured to operate in a stressed environment in any posture.

4. A damping device, characterized by comprising one or more non-rebound constant force mechanisms according to any one of claims 1 to 3, capable of driving the piston end (21) towards the open end (12) and gradually increasing the volume of the closed space (13) when the functional end (22) is subjected to an external impact force until the impact force is counteracted, at which time the control valve (3) is opened.

5. The damping device according to claim 4, characterized in that the force-transmitting body (2) is a force-transmitting rod.

6. Cushioning device according to claim 4, characterized in that it comprises a support frame (6) connecting a plurality of non-bouncing constant force means and a flexible layer (7) arranged outside the functional end (22) of each of the plurality of non-bouncing constant force means.

7. A launch device for a projectile (8), characterised in that it comprises one or more non-rebound constant force mechanisms according to any one of claims 1 to 3, adapted to launch said projectile (8) through said force-bearing portion, said force-bearing portion of said force-transmitting body (2) being adapted to be moved when said piston end (21) is moved towards said closed end (11) by external atmospheric pressure, such that said closed space (13) is progressively smaller until said projectile (8) is launched, at which time said control valve (3) is opened.

8. The transmitting device according to claim 7, characterized in that the force transmitting body (2) employs a cable (4).

9. The launching device according to claim 8, characterized in that it comprises two said rebound free constant force mechanisms, one end of the cable (4) is connected to the piston end (21) of one rebound free constant force mechanism, the other end of the cable (4) is connected to the piston end (21) of the other rebound free constant force mechanism, and the middle part of the cable (4) is located outside the supporting housing (1) and becomes the stress part of the launching device.

10. The cushioning device of any one of claims 4 to 6 or the launching device of any one of claims 7 to 9, characterized in that the cross-sectional areas of the respective support housings (1) in the plurality of non-bouncing constant force mechanisms are all different, partially identical or all different.