Buffer device and method capable of avoiding pneumatic oscillation

Abstract

The invention relates to the technical field of pneumatic buffering, and discloses a buffering device and method capable of avoiding pneumatic oscillation. The fixing cylinder comprises a supporting sleeve, an air inlet end cover and a sealing end cover. The supporting sleeve is connected to the pressure-bearing sleeve in a sliding mode. The fixing cylinder and the pressure-bearing sleeve form a first buffer cavity, and the supporting sleeve, the air inlet end cover and the sealing end cover form a second buffer cavity. A one-way inflation valve is installed on the pressure-bearing sleeve and communicates with the first buffering cavity. A gas guide hole is formed in the gas inlet end cover, a pressure relief hole is formed in the sealing end cover, the diameter of the pressure relief hole is smaller than that of the gas guide hole, and a one-way communication unit is arranged on the fixing cylinder, so that gas in the first buffering cavity flows into the second buffering cavity in a one-way mode through the gas guide hole. Through the arrangement of the one-way conduction unit, the characteristic of gas rebound during buffering is effectively avoided, an excellent shock absorption effect is achieved, and the reciprocating motion mechanism is prevented from vibrating back and forth during buffering after being connected with the pressure-bearing sleeve.

Description

Technical Field

[0001] The invention relates to the technical field of pneumatic buffering, in particular to a buffering device and method capable of avoiding pneumatic shock. Background Art

[0002] In mechanical devices, actuators that perform linear reciprocating motion generally exhibit high-speed motion at the end of their travel. If a deceleration device is not provided for them, it is easy to cause violent collisions between the motion mechanisms, which not only produce abnormal noises, vibrations, and jamming, but also easily damage the motion mechanisms and other components, affecting the life of the mechanical device and even causing safety accidents. Therefore, the research on the end buffer of the linear reciprocating motion mechanism is very hot. The buffer device can absorb the kinetic energy at the end of the linear reciprocating motion mechanism, convert it into heat energy for release, and achieve end buffering.

[0003] At present, the commonly used buffer devices are mainly hydraulic buffer, pneumatic buffer and spring buffer. Compared with hydraulic buffer and spring buffer, pneumatic buffer has the advantages of fast response speed, high energy conversion efficiency, simple structure and low cost. It is often used in mechanical buffer devices that require low cost, fast response speed and high reliability. Due to the elastic characteristics of gas, in the application process, there is often a weak shock absorption ability, which easily causes the mechanism to oscillate back and forth, resulting in an unclear buffering effect. Summary of the invention

[0004] The purpose of the present invention is to provide a buffer device and method for avoiding pneumatic vibration, so as to solve the problem that due to the elastic characteristics of gas, the shock absorption ability is often weak during the application process, which easily causes the mechanism to vibrate back and forth.

[0005] The present invention is achieved through the following technical solutions: a buffer device that can avoid pneumatic shock, including a pressure-bearing sleeve, the pressure-bearing sleeve is closed at only one end; a fixed sleeve, the fixed sleeve including a supporting sleeve, an air inlet end cover, and a sealing end cover, the outer contour of the supporting sleeve fits the inner contour of the pressure-bearing sleeve, the supporting sleeve is slidably connected to the pressure-bearing sleeve, the air inlet end cover is installed at one end of the supporting sleeve close to the pressure-bearing sleeve, and the sealing end cover is installed at the other end; the fixed sleeve and the pressure-bearing sleeve form a first buffer chamber with a variable volume, and the supporting sleeve, the air inlet end cover, and the sealing end cover form a second buffer chamber with a fixed volume; a one-way inflation valve is installed on the pressure-bearing sleeve, and the one-way inflation valve is connected to the first buffer chamber; an air guide hole is provided on the air inlet end cover, and a pressure relief hole is provided on the sealing end cover, the diameter of the pressure relief hole is smaller than the air guide hole, and a one-way conduction unit is provided on the fixed sleeve, so that the gas in the first buffer chamber flows to the second buffer chamber through the air guide hole in one direction.

[0006] In order to better realize the present invention, further, the conduction unit includes a fixed sleeve and a conical slider. The fixed sleeve is installed on the sealing end cover through flange bolts, the conical slider is slidably connected to the fixed sleeve, and a driving spring is installed between the conical slider and the sealing end cover. The conical slider is used to close the air guide hole.

[0007] In order to better implement the present invention, further, the end of the conical slider close to the air intake end cover is provided with an outer conical surface, and the end of the air guide hole close to the conical slider is provided with an inner conical surface, and the angle of the inner conical surface is smaller than the angle of the outer conical surface.

[0008] In order to better implement the present invention, further, the end of the conical slider close to the air intake end cover is disc-shaped, and the diameter of the disc is larger than the diameter of the air guide hole.

[0009] In order to better implement the present invention, further, a first sealing ring is arranged between the air intake end cover and the support sleeve, a second sealing ring is arranged between the sealing end cover and the support sleeve, and a movable sealing group is arranged between the pressure sleeve and the support sleeve.

[0010] In order to better implement the present invention, further, the air intake end cover and the support sleeve are connected by a first threaded fit, and the sealing end cover and the support sleeve are connected by a second threaded fit.

[0011] In order to better implement the present invention, further, the one-way inflation valve is installed on the pressure-bearing sleeve through a fixing nut and a clamping ring.

[0012] A buffering method for avoiding pneumatic shock comprises the following steps:

[0013] A. Nitrogen is injected into the first buffer chamber through the one-way inflation valve to first reset the pressure sleeve and then increase the air pressure in the first buffer chamber until the force exerted on the conical slider by the air pressure in the first buffer chamber is the same as the force exerted on the conical slider by the driving spring and the second buffer chamber;

[0014] B. Fix the sealing end cover and the experimental tooling together; connect the pressure sleeve and the reciprocating motion mechanism;

[0015] C. Start the reciprocating mechanism to make the pressure sleeve start to move and enter the buffering stage; at this time, the pressure sleeve starts to approach the fixed tube, the volume of the first buffer chamber starts to decrease, and the air pressure starts to increase. Due to the increase in air pressure, part of the gas starts to push the conical slider through the air guide hole, thereby flowing into the second buffer chamber. At this time, the first buffer chamber and the second buffer chamber are connected, and the air pressure is the same. At this time, the pressure relief hole is discharging the air flow, but the gas in the first buffer chamber and the second buffer chamber is continuously compressed, so as to achieve buffering of the pressure sleeve; when the pressure sleeve is about to buffer to the stroke end point of the pressure sleeve, there is almost no gas in the first buffer chamber. At this time, the power of the reciprocating mechanism is removed, and the pressure sleeve loses the load. At this time, since there is almost no gas in the first buffer chamber, and the conical slider immediately blocks the air guide hole under the action of the driving spring, the gas in the second buffer chamber will not flow into the first buffer chamber, so the pressure sleeve will not rebound;

[0016] D. Since the gas pressure in the second buffer chamber is relatively high at this time, the internal gas will be slowly discharged from the pressure relief hole until the gas pressure in the second buffer chamber is the same as that in the outside world, and then the next round of buffering operation can be started.

[0017] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0018] (1) The present invention effectively avoids the gas rebound characteristics during buffering by providing the above-mentioned unidirectional conduction unit, has an excellent shock absorption effect, and prevents the reciprocating motion mechanism from vibrating back and forth during buffering after being connected to the pressure-bearing sleeve;

[0019] (2) The present invention can be used as a general device, quickly installed in a test site, and quickly connected to a linear reciprocating motion mechanism to achieve high-speed response buffer deceleration at the end of the linear reciprocating motion mechanism, and has a wide range of applications;

[0020] (3) When the present invention is used as a linear reciprocating mechanism with its own functional performance, it should have a simple structure, not affect the arrangement and function of other components, and have a significant buffering effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a cross-sectional view of the overall structure of the present invention.

[0022] Among them: 1-pressure-bearing sleeve; 2-first buffer chamber; 3-one-way inflation valve; 4-inlet end cover; 5-first threaded fit; 6-first sealing ring; 7-conical slider; 8-movable sealing group; 9-fixed sleeve; 10-support sleeve; 11-driving spring; 12-second buffer chamber; 13-flange bolt; 14-second sealing ring; 15-sealing end cover; 16-second threaded fit. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] Embodiment 1:

[0026] This embodiment provides a buffer device that can avoid pneumatic shock, specifically Figure 1 As shown, it includes a pressure-bearing sleeve 1 and a fixed sleeve, and the pressure-bearing sleeve 1 is closed at only one end; the fixed sleeve includes a supporting sleeve 10, an air inlet end cover 4, and a sealing end cover 15. The outer contour of the supporting sleeve 10 fits the inner contour of the pressure-bearing sleeve 1, and the supporting sleeve 10 is slidably connected to the pressure-bearing sleeve 1. The air inlet end cover 4 is installed at one end of the supporting sleeve 10 close to the pressure-bearing sleeve 1, and the sealing end cover 15 is installed at the other end.

[0027] The fixed cylinder and the pressure-bearing sleeve 1 form a first buffer chamber 2 with variable volume, and the supporting sleeve 10, the air inlet end cover 4, and the sealing end cover 15 form a second buffer chamber 12 with fixed volume; a one-way inflation valve 3 is installed on the pressure-bearing sleeve 1, and the one-way inflation valve 3 is connected to the first buffer chamber 2; an air guide hole is provided on the air inlet end cover 4, and a pressure relief hole is provided on the sealing end cover 15, and the diameter of the pressure relief hole is smaller than that of the air guide hole, and a one-way conduction unit is provided on the fixed cylinder, so that the gas in the first buffer chamber 2 flows unidirectionally to the second buffer chamber 12 through the air guide hole.

[0028] The conduction unit includes a fixed sleeve 9 and a conical slider 7. The fixed sleeve 9 is mounted on a sealing end cover 15 via flange bolts 13. The conical slider 7 is slidably connected to the fixed sleeve 9. A driving spring 11 is installed between the conical slider 7 and the sealing end cover 15. The conical slider 7 is used to close the air guide hole.

[0029] According to the above device, a buffering method for avoiding pneumatic shock is provided, comprising the following steps:

[0030] A. Nitrogen is injected into the first buffer chamber 2 through the one-way inflation valve 3 to first reset the pressure sleeve 1 and then increase the air pressure in the first buffer chamber 2 until the force exerted on the conical slider 7 by the air pressure in the first buffer chamber 2 is the same as the force exerted on the conical slider 7 by the driving spring 11 and the second buffer chamber 12;

[0031] B. Fix the sealing end cover 15 and the experimental tooling together; connect the pressure sleeve 1 and the reciprocating motion mechanism;

[0032] C. Start the reciprocating mechanism to make the pressure sleeve 1 start to move and enter the buffering stage; at this time, the pressure sleeve 1 begins to approach the fixed tube, the volume of the first buffer chamber 2 begins to decrease, and the air pressure begins to increase. Due to the increase in air pressure, part of the gas begins to push the conical slider 7 through the air guide hole, thereby flowing into the second buffer chamber 12. At this time, the first buffer chamber 2 and the second buffer chamber 12 are connected, and the air pressure is the same. At this time, the pressure relief hole is discharging the air flow, but the gas in the first buffer chamber 2 and the second buffer chamber 12 is continuously compressed, so as to achieve buffering of the pressure sleeve 1; when the pressure sleeve 1 is about to be buffered to the stroke end point, there is almost no gas in the first buffer chamber 2. At this time, the power of the reciprocating mechanism is removed, and the pressure sleeve 1 loses the load. At this time, since there is almost no gas in the first buffer chamber 2, and the conical slider 7 immediately blocks the air guide hole under the action of the driving spring 11, the gas in the second buffer chamber 12 will not flow into the first buffer chamber 2, so the pressure sleeve 1 will not rebound;

[0033] D. Since the gas pressure in the second buffer chamber 12 is relatively high at this time, the internal gas will be slowly discharged from the pressure relief hole until the gas pressure in the second buffer chamber 12 is the same as that in the outside, and then the next round of buffering operation can be started.

[0034] The one-way conduction unit is provided as described above, which effectively avoids the gas rebound characteristic during buffering, has an excellent shock-absorbing effect, and prevents the reciprocating motion mechanism from oscillating back and forth during buffering after being connected to the pressure-bearing sleeve 1 .

[0035] Embodiment 2:

[0036] This embodiment is further expanded on the basis of the above embodiment. Figure 1 As shown, the end of the conical slider 7 close to the air inlet end cover 4 is provided with an outer conical surface, and the end of the air guide hole close to the conical slider 7 is provided with an inner conical surface, and the angle of the inner conical surface is smaller than the angle of the outer conical surface.

[0037] By using the conical surface to block the air guide hole, the contact area between the conical slider 7 and the air intake end cover 4 can be increased within a limited space, thereby improving the blocking effect.

[0038] The other parts of this embodiment are the same as those of the above embodiment and will not be described in detail.

[0039] Embodiment 3:

[0040] This embodiment is further expanded on the basis of the above embodiment, and the end of the conical slider 7 close to the air intake end cover 4 is disc-shaped, and the diameter of the disc is larger than the diameter of the air guide hole.

[0041] Using a disc to block the air guide hole can effectively reduce the thickness of the air intake end cover 4 and reduce the overall volume.

[0042] The other parts of this embodiment are the same as those of the above embodiment and will not be described in detail.

[0043] Embodiment 4:

[0044] This embodiment is further expanded on the basis of the above embodiment. Figure 1 As shown, a first sealing ring 6 is provided between the air intake end cover 4 and the supporting sleeve 10 , a second sealing ring 14 is provided between the sealing end cover 15 and the supporting sleeve 10 , and a movable sealing group 8 is provided between the pressure-bearing sleeve 1 and the supporting sleeve 10 .

[0045] The first sealing ring 6 and the movable sealing group 8 are used for sealing to improve the overall air tightness of the device and prevent uncontrollable gas leakage during the gas compression process, which would lead to buffer failure.

[0046] The other parts of this embodiment are the same as those of the above embodiment and will not be described in detail.

[0047] Embodiment 5:

[0048] This embodiment is further expanded on the basis of the above embodiment. Figure 1 As shown, the air intake end cover 4 is connected to the support sleeve 10 via a first threaded fit 5 , and the sealing end cover 15 is connected to the support sleeve 10 via a second threaded fit 16 .

[0049] Threaded connection is used, which is convenient for disassembly and has good connection stability.

[0050] The other parts of this embodiment are the same as those of the above embodiment and will not be described in detail.

[0051] Embodiment 6:

[0052] This embodiment is further expanded on the basis of the above embodiment. Figure 1 As shown, the one-way inflation valve 3 is installed on the pressure-bearing sleeve 1 through a fixing nut and a clamping ring.

[0053] Through this arrangement, the one-way inflation valve 3 can be detachably mounted on the pressure-bearing sleeve 1 , and when the one-way inflation valve 3 is damaged, it is easy to replace without causing the entire one-way inflation valve 3 to be scrapped.

[0054] The other parts of this embodiment are the same as those of the above embodiment and will not be described in detail.

[0055] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A buffer device capable of avoiding pneumatic shock, characterized in that: It comprises a pressure-bearing sleeve (1), wherein only one end of the pressure-bearing sleeve (1) is closed; A fixed sleeve, the fixed sleeve comprising a support sleeve (10), an air intake end cover (4), and a sealing end cover (15); the outer contour of the support sleeve (10) is fitted with the inner contour of the pressure-bearing sleeve (1); the support sleeve (10) is slidably connected to the pressure-bearing sleeve (1); the air intake end cover (4) is installed at one end of the support sleeve (10) close to the pressure-bearing sleeve (1), and the sealing end cover (15) is installed at the other end; The fixed cylinder and the pressure-bearing sleeve (1) form a first buffer chamber (2) with a variable volume, and the supporting sleeve (10), the air inlet end cover (4) and the sealing end cover (15) form a second buffer chamber (12) with a fixed volume; a one-way inflation valve (3) is installed on the pressure-bearing sleeve (1), and the one-way inflation valve (3) is connected to the first buffer chamber (2); an air guide hole is provided on the air inlet end cover (4), and a pressure relief hole is provided on the sealing end cover (15), and the diameter of the pressure relief hole is smaller than that of the air guide hole; a one-way conduction unit is provided on the fixed cylinder, so that the gas in the first buffer chamber (2) flows unidirectionally into the second buffer chamber (12) through the air guide hole.

2. A buffer device capable of avoiding pneumatic shock according to claim 1, characterized in that: The conduction unit comprises a fixed sleeve (9) and a conical slider (7); the fixed sleeve (9) is mounted on a sealing end cover (15) via a flange bolt (13); the conical slider (7) is slidably connected to the fixed sleeve (9); a driving spring (11) is mounted between the conical slider (7) and the sealing end cover (15); and the conical slider (7) is used to close the air guide hole.

3. A buffer device capable of avoiding pneumatic shock according to claim 2, characterized in that: The end of the conical slider (7) close to the air inlet end cover (4) is provided with an outer conical surface, and the end of the air guide hole close to the conical slider (7) is provided with an inner conical surface, and the angle of the inner conical surface is smaller than the angle of the outer conical surface.

4. A buffer device capable of avoiding pneumatic shock according to claim 2, characterized in that: The end of the conical slider (7) close to the air inlet end cover (4) is disc-shaped, and the diameter of the disc is larger than the diameter of the air guide hole.

5. A buffer device capable of avoiding pneumatic shock according to claim 1, characterized in that: A first sealing ring (6) is arranged between the air intake end cover (4) and the supporting sleeve (10), a second sealing ring (14) is arranged between the sealing end cover (15) and the supporting sleeve (10), and a movable sealing group (8) is arranged between the pressure-bearing sleeve (1) and the supporting sleeve (10).

6. A buffer device capable of avoiding pneumatic shock according to claim 1, characterized in that: The air intake end cover (4) is connected to the support sleeve (10) via a first threaded fit (5), and the sealing end cover (15) is connected to the support sleeve (10) via a second threaded fit (16).

7. A buffer device capable of avoiding pneumatic shock according to claim 1, characterized in that: The one-way inflation valve (3) is installed on the pressure-bearing sleeve (1) via a fixing nut and a clamping ring.

8. A buffering method for avoiding pneumatic shock, using the device according to any one of claims 1 to 7, characterized in that: The steps include: A. nitrogen is injected into the first buffer chamber (2) through the one-way inflation valve (3), so as to first reset the pressure-bearing sleeve (1) and then increase the air pressure in the first buffer chamber (2) until the force exerted on the conical slider (7) by the air pressure in the first buffer chamber (2) is the same as the force exerted on the conical slider (7) by the driving spring (11) and the second buffer chamber (12); B. Fix the sealing end cover (15) and the experimental tooling together; connect the pressure sleeve (1) and the reciprocating motion mechanism; C. Start the reciprocating mechanism to make the pressure-bearing sleeve (1) start to move and enter the buffering stage; at this time, the pressure-bearing sleeve (1) starts to approach the fixed cylinder, the volume of the first buffer chamber (2) starts to decrease, and the air pressure starts to increase. Due to the increase in air pressure, part of the gas starts to push the conical slider (7) through the air guide hole, thereby flowing into the second buffer chamber (12). At this time, the first buffer chamber (2) and the second buffer chamber (12) are connected, and the air pressure is the same. At this time, the pressure relief hole is discharging airflow, but the gas in the first buffer chamber (2) and the second buffer chamber (12) is Continuous compression is performed to achieve buffering of the pressure-bearing sleeve (1); when buffering is about to reach the end point of the stroke of the pressure-bearing sleeve (1), there is almost no gas in the first buffer chamber (2), and at this time, the power of the reciprocating motion mechanism is removed, and the pressure-bearing sleeve (1) loses its load. At this time, since there is almost no gas in the first buffer chamber (2), and the conical slider (7) immediately blocks the air guide hole under the action of the driving spring (11), the gas in the second buffer chamber (12) will not flow into the first buffer chamber (2), and the pressure-bearing sleeve (1) will not rebound; D. Since the gas pressure in the second buffer chamber (12) is relatively high at this time, the internal gas will be slowly discharged from the pressure relief hole until the gas pressure in the second buffer chamber (12) is the same as that in the outside, and then the next round of buffering operation can be started.

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