CN210344140U

CN210344140U - Air-mud type buffer device

Info

Publication number: CN210344140U
Application number: CN201920976149.1U
Authority: CN
Inventors: 钟波; 黄科; 钟鑫; 周保君; 罗昌杰
Original assignee: Shenzhen Cansinga Technology Co ltd
Current assignee: Shenzhen Cansinga Technology Co ltd
Priority date: 2019-06-26
Filing date: 2019-06-26
Publication date: 2020-04-17
Anticipated expiration: 2029-06-26

Abstract

The utility model provides a gas-cement type buffer device, which comprises a first cylinder body, wherein the inner cavity of the first cylinder body is filled with compressed gas; the first end of the second cylinder body extends into the inner cavity of the first cylinder body from the first opening at the first end of the first cylinder body, a partition wall is arranged in the inner cavity of the second cylinder body and divides the inner cavity of the second cylinder body into a first cavity and a second cavity, and elastic cement gum is filled in the first cavity; the end cover is covered on the second opening at the first end of the second cylinder body in a sealing manner; and the piston rod comprises a piston part and a rod part, the piston part is accommodated in the first cavity and has a gap with the second cylinder body, one end of the rod part penetrates through the barrier wall, and the other end of the rod part penetrates through the end cover to be fixedly connected with the second end of the first cylinder body. The utility model discloses a compressed gas and elasticity daub cooperation utilize the throttle effect of elasticity daub to realize absorbing the energy that external force produced, and the volume expansion through compressed gas realizes that the resilience of device resets, and then has the advantage of daub buffer and gas-liquid buffer concurrently.

Description

Air-mud type buffer device

Technical Field

The utility model belongs to the technical field of passive safety device, more specifically say, relate to a gas mud formula buffer.

Background

The buffer is a device for keeping the loading and unloading test force stable or slowing down the impact when a collision or a sample is broken, is used for controlling the adverse effect of overlarge energy on equipment, generates large deformation during working, and is usually only pressed without being pulled. After the collision is over, the initial state can be restored.

In the fields of industrial production, transportation, cranes and the like, various buffers are widely used for preventing the mechanism from being damaged due to rigid collision. According to the structural features and the working principle of the buffer, the commonly used buffers can be divided into:

a) solid medium buffer type: ring spring, coil spring, friction wedge;

b) liquid medium buffer type: hydraulic, gas-liquid, elastic daub, magnetorheological fluid;

c) buffering by a high polymer material medium: rubber, elastomers, polyurethanes;

d) gas medium buffer type: air type buffer and the like

For the buffer, the main technical indexes are as follows:

stored energy (We): also called capacity, refers to the energy stored by the buffer over a stroke.

Energy absorbed (consumed) (Wa): the buffer absorbs (consumes) energy at a certain stroke.

Released energy (We-Wa): the energy which is not absorbed by the buffer and is returned to the impact object after the buffer rebounds.

Absorption rate:

absorbed energyThe ratio of the amount to the stored energy.

For high-end bumpers, particularly in the passenger transport field, it is desirable that the bumper has the effects of large energy absorption, smooth rebound and no obvious impact vibration. The main method for checking the performance is to evaluate the absorption rate in a mechanical curve, and the higher the absorption rate is, the more energy consumed by the buffer is, and the less energy value rebounded to the impact is, so that the rebounding process is more stable, and the riding comfort is higher.

Practice tests prove that the existing various buffers have relatively good effects such as a cement buffer and a gas-liquid buffer, and other buffers have the main defects of poor flexibility in the rebound process and obvious impact vibration, for example, a spring buffer is basically in rigid rebound, so that obvious pause and frustration are brought to passengers. Therefore, two types of buffers, namely cement and gas-liquid, are commonly adopted in occasions such as high-speed trains, subway train hook buffer devices, passenger plane undercarriages and the like, and products such as springs, polyurethane and the like are commonly adopted in the fields of trucks, cranes and the like.

The daub and the gas-liquid buffer, although having relatively good performance, have drawbacks:

the absorption rate of the clay buffer is about 75-85% generally, the viscosity of the clay medium is high, the intermolecular friction is sufficient, the energy consumption performance is good, a large amount of energy can be absorbed, the heat dissipation is fast, and the clay buffer can work under high frequency; the daub material is formed by adding flame retardant, anti-compression agent, lubricant, anti-aging agent and the like into a silicon high molecular compound, is an unvulcanized organic silicon compound, and has stable chemical properties within-50 ℃, so that the daub material can be applied to low-temperature occasions; but compared with the gas-liquid buffer, the impact vibration phenomenon is relatively obvious when the gas-liquid buffer rebounds, and the gas-liquid buffer is not suitable for occasions with higher requirements on comfort level;

the gas-liquid buffer takes compressed gas as resilience power, and the absorption rate can reach more than 90 percent, so the gas-liquid buffer has the greatest advantages of stable resilience, small resilience impact and high comfort level; however, hydraulic oil is used as a buffer medium, and the hydraulic oil has general heat dissipation performance and is easy to generate heat under high-frequency action, so that the hydraulic oil is not suitable for high-frequency working occasions; in addition, the hydraulic oil has low viscosity, which causes difficult sealing, high manufacturing precision of the cylinder body and high price; and the hydraulic oil is easy to be condensed at low temperature and is not suitable for low-temperature occasions.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a gas-liquid mud formula buffer, including but not limited to solving the gas-liquid buffer and being not suitable for high frequency, low temperature operational environment's technical problem.

In order to solve the technical problem, an embodiment of the utility model provides a gas mud formula buffer, include:

the first end of the first cylinder body is provided with a first opening, the first opening is communicated with an inner cavity of the first cylinder body, and the inner cavity of the first cylinder body is filled with compressed gas;

the first end of the second cylinder body extends into the inner cavity of the first cylinder body from the first opening and is in sliding fit with the first cylinder body, the first end of the second cylinder body is provided with a second opening, the second opening is communicated with the inner cavity of the second cylinder body, a partition wall is arranged in the inner cavity of the second cylinder body and divides the inner cavity of the second cylinder body into a first cavity and a second cavity, the first cavity is close to the first end of the second cylinder body, the second cavity is close to the second end of the second cylinder body, and the first cavity is filled with elastic cement gum;

the end cover is covered on the second opening in a sealing mode, and a first flow limiting structure is arranged on the end cover to inject the elastic daub and limit the elastic daub from flowing into the inner cavity of the first cylinder body from the first cavity; and

the piston rod comprises a piston part and a rod part, the piston part surrounds the middle of the rod part and is contained in the first cavity, a gap is formed between the piston part and the second cylinder body, one end of the rod part penetrates through the blocking wall, and the other end of the rod part penetrates through the end cover and is fixedly connected with the second end of the first cylinder body.

Furthermore, a second flow limiting structure is arranged on the piston part, and the elastic daub can flow back to the side close to the partition wall from the side close to the end cover through the second flow limiting structure.

Further, the first current limiting structure includes:

the first accommodating groove is concavely arranged on the inner end surface of the end cover;

the first through hole penetrates through the outer end face of the end cover and is communicated with the first accommodating groove;

the first steel ball is accommodated in the first accommodating groove and can seal the first through hole; and

the first hollow stud is arranged on the notch of the first accommodating groove in a rotating mode so as to limit the first steel ball from falling out of the first accommodating groove;

the second current limiting structure includes:

the second accommodating groove is concavely arranged on the end face, facing the blocking wall, of the piston part;

the second through hole penetrates through the end face, facing the end cover, of the piston part and is communicated with the second accommodating groove;

the second steel ball is accommodated in the second accommodating groove and can seal the second through hole; and

and the second hollow stud is spirally arranged on the notch of the second accommodating groove to limit the second steel ball from falling out of the second accommodating groove.

Furthermore, at least two second flow limiting structures are arranged on the piston part and distributed at equal intervals along the circumferential direction of the piston part.

Further, the gas mud type buffering device further comprises:

and the first sealing ring is annularly arranged between the first cylinder body and the second cylinder body.

Further, the gas mud type buffering device further comprises:

and the second sealing ring is annularly arranged between the blocking wall and the rod part.

Furthermore, the first end of the first cylinder body is provided with a limiting flange, the limiting flange is annularly arranged on the first opening, the second cylinder body comprises a protruding portion, the protruding portion protrudes outwards from the outer surface of the second cylinder body, and the protruding portion can be in lap joint with the limiting flange to form limiting.

Further, the gas mud type buffering device further comprises:

and the one-way valve is arranged on the second end of the first cylinder body in a penetrating way.

The utility model provides a gas mud formula buffer's beneficial effect lies in: the device has the advantages that the compressed gas is matched with the elastic daub, the energy generated by external force is absorbed by utilizing the throttling effect of the elastic daub, the rebound resetting of the device is realized through the volume expansion of the compressed gas, and the device further has the advantages of a daub buffer and a gas-liquid buffer, so that the technical problem that the gas-liquid buffer is not suitable for high-frequency and low-temperature working environments is effectively solved, the application range of the buffer device is expanded, and the performance requirement of high-end passive safety protection is met.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.

Fig. 1 is a schematic perspective view of a gas-mud type buffering device provided in an embodiment of the present invention;

fig. 2 is a schematic axial sectional view of an initial state of the air-sludge buffer device according to an embodiment of the present invention;

fig. 3 is a schematic axial sectional view of a compressed air-sludge buffer device according to an embodiment of the present invention;

FIG. 4 is an enlarged view of portion A of FIG. 2;

fig. 5 is an enlarged schematic view of a portion B in fig. 2.

Wherein, in the figures, the respective reference numerals:

1-gas-cement type buffer device, 10-first cylinder body, 20-second cylinder body, 30-end cover, 40-piston rod, 50-screw, 60-first sealing ring, 70-second sealing ring, 80-one-way valve, 11-limiting flange, 21-blocking wall, 22-bulge, 41-piston part, 42-rod part, 100-inner cavity of first cylinder body, 200-clearance, 201-first cavity, 202-second cavity, 300-first current-limiting structure, 301-first containing groove, 302-first through hole, 303-first steel ball, 410-second current-limiting structure, 411-second containing groove, 412-second through hole, 413-second steel ball.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element. The terms "upper", "lower", "left", "right", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description, and do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and operate, and thus are not to be construed as limiting the patent, and the specific meanings of the above terms will be understood by those skilled in the art according to specific situations. The terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. The term "plurality" means two or more unless specifically limited otherwise.

It is right now that the utility model provides a gas mud formula buffer explains. Referring to fig. 1 to 3, the gas-cement type buffering device 1 includes a first cylinder 10, a second cylinder 20, an end cap 30 and a piston rod 40, wherein a first end of the first cylinder 10 is provided with a first opening, the first opening is communicated with an inner cavity 100 of the first cylinder, and a compressed gas is filled in an inner cavity 200 of the first cylinder, the compressed gas is a gas which is injected into the inner cavity 100 of the first cylinder and has a certain initial pressure, and the amount of gas injected into the inner cavity 100 of the first cylinder is greater than the volume of the inner cavity 100 of the first cylinder, and the compressed gas preferably adopts inert gas such as nitrogen, argon and the like; the first end of the second cylinder 20 extends into the inner cavity 100 of the first cylinder from the first opening of the first cylinder 10 and is in sliding fit with the first cylinder 10, that is, the first end of the second cylinder 20 can slide along the inner cavity 100 of the first cylinder to extend or shorten the overlapping length of the two, the first end of the second cylinder 20 is provided with a second opening, the second opening is communicated with the inner cavity of the second cylinder, a partition wall 21 is arranged in the inner cavity of the second cylinder, the partition wall 21 divides the inner cavity of the second cylinder into a first cavity 201 and a second cavity 202, the first cavity 201 is close to the first end of the second cylinder 20, the second cavity 202 is close to the second end of the second cylinder 20, the first cavity 201 is filled with elastic cement, the second cavity 202 is filled with air, and no liquid or inert gas needs to be filled; the end cover 30 covers the second opening of the second cylinder 20, and a first flow limiting structure 300 is arranged on the end cover 30 to inject the elastic cement and limit the elastic cement from flowing into the inner cavity 100 of the first cylinder from the first chamber 201; the piston rod 40 includes a piston portion 41 and a rod portion 42, the piston portion 41 surrounds the middle of the rod portion 42 and is accommodated in the first chamber 201, a gap 200 is provided between the piston portion 41 and the second cylinder 20, that is, a throttling gap is provided between a surface of the piston portion 41 parallel to the axis thereof and the corresponding inner surface of the second cylinder 20, one end of the rod portion 42 is inserted into the barrier wall 21, that is, a first through hole is opened on the barrier wall 21, one end of the rod portion 42 can penetrate through the first through hole and extend into the second chamber 202, the other end of the rod portion 42 penetrates through the end cover 30 and is tightly connected with the second end of the first cylinder 10, that is, a second through hole is opened on the end cover 30, and the other end of the rod portion 42 can penetrate through the second through hole and extend into the inner cavity 100 of the first cylinder and is welded with the second end of the first cylinder 10 or is in threaded connection with the second end of the. It will be appreciated that the initial position of the piston portion 41 is on the side of the first chamber 201 adjacent the end cap 30.

When in use, the second end of the first cylinder 10 may be mounted on the protected object, or the second end of the second cylinder 20 may be mounted on the protected object. When the second end of the first cylinder 10 is mounted on the protected object and the end surface of the second end of the second cylinder 20 is impacted by an external force, the first end of the second cylinder 20 slides along the inner cavity 100 of the first cylinder towards the second end of the first cylinder 10, at this time, the compressed gas in the inner cavity 100 of the first cylinder is further compressed, and further part of energy generated by the external force is converted into internal energy to form high pressure, the piston part 41 of the piston rod 40 moves from one side close to the end cover 30 to one side close to the blocking wall 21 along the first chamber 201, and extrudes the elastic cement in the first chamber 201 to flow into one side close to the end cover 30 through the gap 200, and in this process, the elastic cement can generate viscous friction force to absorb the rest energy generated by the external force, and the movable end of the rod part 42 of the piston rod 40 passes through the blocking wall 21 and extends into the second chamber 202; when the external force is removed, the compressed gas with high pressure acts on the first end of the second cylinder 20, pushing the first end of the second cylinder 20 to slide slowly toward the first end of the first cylinder 10, at this time, the piston portion 41 moves along the first chamber 201 from the side close to the blocking wall 21 to the side close to the end cap 30, and presses the elastic daub in the first chamber 201 to flow back to the side close to the blocking wall 21 through the gap 200, and the movable end of the rod portion 42 retracts into the blocking wall 21, thereby resetting the gas-cement type buffer device 1.

The utility model provides a gas mud formula buffer 1 has adopted compressed gas and elasticity daub cooperation, utilize the throttle effect of elasticity daub to realize absorbing the energy that external force produced, the resilience through compressed gas's volume expansion realization device resets, and then has the advantage of daub buffer and gas-liquid buffer concurrently, thereby solved effectively that the gas-liquid buffer is not suitable for high frequency, low temperature operational environment's technical problem, buffer's accommodation has been enlarged, high-end passive safety protection's performance requirement has been satisfied.

Further, referring to fig. 3, as a specific embodiment of the air-cement type buffering device provided by the present invention, a second flow-limiting structure 410 is disposed on the piston portion 41, and the elastic cement can flow back to the side close to the blocking wall 21 from the side close to the end cover 30 through the second flow-limiting structure 410. Specifically, the second flow restriction structure 410 penetrates through the opposite end surfaces of the piston portion 41, and when the compressed gas in the inner cavity 100 of the first cylinder expands after the external force acting on the second end of the second cylinder 20 is removed, the second flow restriction structure 410 can both supply the elastic cement to flow from the side of the first chamber 201 close to the end cover 30 to the side of the first chamber 201 close to the barrier wall 21 and restrict the elastic cement from flowing from the side of the first chamber 201 close to the barrier wall 21 to the side of the first chamber 201 close to the end cover 30. Therefore, the backflow speed of the elastic daub is effectively increased after the external force is removed, and the elastic daub can intensively flow through the gap 200 in the process of being impacted by the external force, so that enough viscous friction force is generated to absorb energy generated by the external force.

Further, referring to fig. 2 to 4, as an embodiment of the present invention, the first current limiting structure 300 includes a first receiving groove 301, a first through hole 302, a first steel ball 303 and a first hollow stud, and the second current limiting structure 410 includes a second receiving groove 411, a second through hole 412, a second steel ball 413 and a second hollow stud, wherein the first receiving groove 301 is concavely disposed on the inner end surface of the end cover 30, the first through hole 302 penetrates through the outer end surface of the end cover 30 and is communicated with the first receiving groove 301, the first steel ball 303 is received in the first receiving groove 301, and can cover the first through hole 302, and the first hollow stud (not shown) is rotatably disposed on the notch of the first receiving groove 301 to prevent the first steel ball 303 from coming out of the first receiving groove 301; the second receiving groove 411 is concavely disposed on an end surface of the piston portion 41 facing the blocking wall 21, the second through hole 412 penetrates through the end surface of the piston portion 41 facing the end cap 30 and is communicated with the second receiving groove 411, the second steel ball 413 is received in the second receiving groove 411 and can cover the second through hole 412, and a second hollow stud (not shown) is spirally disposed on a notch of the second receiving groove 411 to prevent the second steel ball 413 from being released from the second receiving groove 411. Specifically, a channel formed by the connection of the first receiving groove 301 and the first through hole 302 and a channel formed by the connection of the second receiving groove 411 and the second through hole 412 respectively penetrate through the end cover 30 and the piston portion 41, wherein the width of the first receiving groove 301 is larger than the aperture of the first through hole 302, the width of the second receiving groove 411 is larger than the aperture of the second through hole 412, the outer diameter of the first steel ball 303 is matched with the width of the first receiving groove 301, the outer diameter of the second steel ball 413 is matched with the width of the second receiving groove 411, an internal thread is formed at the notch of the first receiving groove 301, the internal thread is in threaded connection with the external thread of the first hollow stud, an internal thread is formed at the notch of the second receiving groove 411, the internal thread is in threaded connection with the external thread of the second hollow stud, the first steel ball 303 can move back and forth between the side connected with the first through hole 302 and the first hollow stud along the first receiving groove, the second ball 413 can move back and forth along the second receiving groove 411 between the side connected with the second through hole 412 and the second hollow stud, so that the first flow limiting structure 300 and the second flow limiting structure 410 respectively function as a check valve.

Further, please refer to fig. 3, as a specific embodiment of the present invention, at least two second flow-limiting structures 410 are disposed on the piston portion 41, and the at least two second flow-limiting structures 410 are distributed along the circumferential direction of the piston portion 41 at equal intervals, that is, if two second flow-limiting structures 410 are disposed on the piston portion 41, the two second flow-limiting structures 410 are symmetrically distributed, and if three or more second flow-limiting structures 410 are disposed on the piston portion 41, the three or more second flow-limiting structures 410 are uniformly distributed on the piston portion 41 around the axis of the piston rod 40. Therefore, the backflow speed of the elastic daub can be increased after the external force is removed, the piston rod 40 is effectively prevented from shaking due to the fact that the force acting on the piston part 41 is unbalanced in the backflow process of the elastic daub, and the running stability of the air-mud type buffer device 1 is further improved.

Further, please refer to fig. 2 and fig. 3, as a specific embodiment of the present invention, the gas-mud type damping device 1 further includes a first sealing ring 60, and the first sealing ring 60 is annularly disposed between the first cylinder 10 and the second cylinder 20. Specifically, a second mounting groove may be formed on the outer surface of the second cylinder 20, the first sealing ring 60 is embedded in the second mounting groove, and the protruding portion of the first sealing ring 60 protruding outside the second mounting groove abuts against the inner surface of the first cylinder 10, or a first mounting groove may be formed on the inner surface of the first cylinder 10, the first sealing ring 60 is embedded in the first mounting groove, and the protruding portion of the first sealing ring 60 protruding outside the first mounting groove abuts against the outer surface of the second cylinder 20, so that leakage of compressed gas from the gap between the first cylinder 10 and the second cylinder 20 when the first cylinder 10 and the second cylinder 20 slide relatively is effectively prevented.

Further, referring to fig. 2 and fig. 3, as a specific embodiment of the present invention, the gas-mud type buffering device 1 further includes a second sealing ring 70, and the second sealing ring 70 is disposed between the blocking wall 21 and the rod portion 42. Specifically, a fourth mounting groove may be formed on the outer surface of the rod portion 42 of the piston rod 40, the second sealing ring 70 is embedded in the fourth mounting groove, and a protruding portion of the second sealing ring 70 protruding out of the fourth mounting groove abuts against the inner surface of the barrier wall 21, or a third mounting groove may be formed on the inner surface of the barrier wall 21, the second sealing ring 70 is embedded in the third mounting groove, and a protruding portion of the second sealing ring 70 protruding out of the third mounting groove abuts against the outer surface of the rod portion 42, so that the elastic cement is effectively prevented from leaking from the first chamber 201 into the second chamber 202 when the rod portion 42 slides relative to the barrier wall 21.

Further, please refer to fig. 2 and 5, as a specific embodiment of the present invention, a limit flange 11 is disposed on the first end of the first cylinder 10, the limit flange 11 is disposed around the first opening of the first cylinder 10, and the second cylinder 20 includes a protrusion 22, the protrusion 22 protrudes outward from the outer surface of the second cylinder 20, and the protrusion 22 can overlap with the limit flange 11 to form a limit. Specifically, the position-limiting flange 11 is protruded on the inner surface of the first cylinder 10 along the circumferential direction of the first opening, the protrusion 22 is protruded on the outer surface of the second cylinder 20 along the circumferential direction and extends from the first end of the second cylinder 20 to the second end of the second cylinder 20, and when the air-cement type damping device 1 is at the initial position, the protrusion 22 overlaps the position-limiting flange 11 to limit the second cylinder 20 in the inner cavity 100 of the first cylinder.

Further, referring to fig. 1 to 3, as a specific embodiment of the air sludge type buffering device provided by the present invention, the air sludge type buffering device 1 further includes a check valve 80, and the check valve 80 is disposed on the second end of the first cylinder 10. Specifically, the check valve 80 penetrates opposite side end surfaces of the first end of the first cylinder 10 to inject the compressed gas into the inner chamber 100 of the first cylinder, and effectively prevents the compressed gas from leaking out of the inner chamber 100 of the first cylinder.

The above are merely examples of the present invention and are not intended to limit the present invention. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. Gas mud formula buffer, its characterized in that includes:

2. The air cement damper as claimed in claim 1, wherein a second flow restriction structure is provided on said piston portion, through which said elastic cement can flow back from a side adjacent to said end cap to a side adjacent to said partition wall.

3. The gas sludge cushioning device of claim 2, wherein said first flow restricting structure comprises:

the second current limiting structure includes:

4. The gas-cement damper as claimed in claim 3, wherein at least two of said second flow-restricting structures are provided on said piston portion, and at least two of said second flow-restricting structures are equally spaced along a circumferential direction of said piston portion.

5. A sludge buffer apparatus as claimed in any one of claims 1 to 4, further comprising:

6. The gas cement buffer unit as defined in claim 5, further comprising:

7. The gas-cement buffer device as claimed in claim 6, wherein the first end of the first cylinder is provided with a limit flange, the limit flange is arranged around the first opening, the second cylinder comprises a protrusion, the protrusion protrudes outwards from the outer surface of the second cylinder, and the protrusion can be overlapped with the limit flange to form a limit.

8. The gas cement buffer unit as defined in claim 7, further comprising: