CN112576671A - Return stroke controllable nitrogen spring and operation control method - Google Patents

Return stroke controllable nitrogen spring and operation control method Download PDF

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Publication number
CN112576671A
CN112576671A CN202011607761.5A CN202011607761A CN112576671A CN 112576671 A CN112576671 A CN 112576671A CN 202011607761 A CN202011607761 A CN 202011607761A CN 112576671 A CN112576671 A CN 112576671A
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China
Prior art keywords
chamber
piston
module
piston rod
spring
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CN202011607761.5A
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Chinese (zh)
Inventor
陈燕明
吴凯
岳凤飞
易涛
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Xingda Precision Machinery Manufacturing Co ltd
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Xingda Precision Machinery Manufacturing Co ltd
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Priority to CN202011607761.5A priority Critical patent/CN112576671A/en
Publication of CN112576671A publication Critical patent/CN112576671A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/02—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum
    • F16F9/0209—Telescopic
    • F16F9/0218—Mono-tubular units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/02—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum
    • F16F9/0209—Telescopic
    • F16F9/0245—Means for adjusting the length of, or for locking, the spring or dampers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/02—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum
    • F16F9/0209—Telescopic
    • F16F9/0281—Details

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Damping Devices (AREA)

Abstract

The invention discloses a return stroke controllable nitrogen spring and an operation control method, belonging to the technical field of elastic element products, wherein a cavity inside the elastic element product is filled with high-pressure nitrogen, and the specific structure of the elastic element product comprises the following steps: working cylinder module, guide holder module, piston and piston rod module, gas circuit and control valve module, the working cylinder module constitutes the basic frame of spring, the guide holder module is in the opening tip of working cylinder module piston and piston rod module make reciprocal linear motion in the closed working chamber that working cylinder module and guide holder module become, the reciprocating linear motion of control piston and piston rod module, realization expectation function is embedded to gas circuit and control valve module in working cylinder module and the piston and piston rod module.

Description

Return stroke controllable nitrogen spring and operation control method
Technical Field
The invention relates to the technical field of elastic element products, in particular to a return stroke controllable nitrogen spring and an operation control method.
Background
The nitrogen spring is a novel elastic element taking high-pressure nitrogen as a working medium, and has the excellent performances of small volume, gentle elasticity-stroke curve, long working stroke, no need of pre-tightening, flexible installation mode and the like, so that the nitrogen spring gradually replaces conventional elastic elements such as metal springs, elastic rubber, air cushions and the like in many fields, and particularly in the field of die industry, the replacement is more thorough and obvious.
In recent years, as molds have been rapidly developed in the direction of precision, high efficiency, long life, and the like, more and more new requirements have been made on the performance of nitrogen springs. For example: the nitrogen spring is required to be kept in a compressed state according to the time specified by the stamping process during die opening, namely: a "return controllable" lock-up state; in addition, the nitrogen spring with controllable return stroke can be popularized and applied in a plurality of fields such as mechanical manufacturing, automobiles, electronic appliances and the like. The common nitrogen spring can not meet the requirements due to uncontrollable return stroke, but the return stroke controllable nitrogen spring in the prior art generally has the defects of maximum stroke change in work, easy loosening of the connection between the piston and the piston rod, low operation reliability and high price, and influences popularization and use.
In order to meet the market demand, it is imperative to develop a novel return stroke controllable nitrogen spring which can overcome the defects and has stable and reliable work.
Disclosure of Invention
The invention aims to solve the problems, and provides a return stroke controllable nitrogen spring and an operation control method thereof, so that the maximum stroke is always fixed and unchanged in the working process, a piston is stably connected with a piston rod and is not easy to loosen, the working is more stable and reliable, the stroke can be conveniently adjusted, the adaptability of a product is greatly improved, and the requirements of customers can be better met.
In order to realize the purpose, the invention adopts the technical scheme that: a return stroke controllable nitrogen spring comprises a working cylinder module, a guide seat module, a piston and piston rod module, a gas circuit and a control valve module, wherein the guide seat module is positioned at the opening end part of the working cylinder module, the piston and piston rod module in a closed working cavity formed by the working cylinder module and the guide seat module makes reciprocating linear motion, the gas circuit and control valve module is embedded in the working cylinder module and the piston and piston rod module, and the gas circuit and control valve module controls the reciprocating linear motion of the piston and piston rod module; the working cylinder module comprises a cylinder body, an upper mounting groove and a lower mounting groove are arranged on the cylinder body, and an air charging and discharging port is also arranged on the cylinder body; the guide seat module comprises an upper guide seat and a lower guide seat, and an adjusting pad is arranged between the upper guide seat and the lower guide seat; the piston and piston rod module comprises a piston rod and a piston, the piston rod is pressed into the cylinder body from the upper dead center position under the action of external force, a fixed hanging table is arranged in the middle of the piston rod and connected with the piston, a cavity for the air guide rod to move is arranged in the center of the tail of the piston rod, and a sealing block is arranged at the opening end part of the cavity; the air path and control valve module comprises a 1# chamber and a 2# chamber which are formed in the cylinder body in a separating mode through a piston, a one-way valve which is circumferentially arranged on the piston, and a control valve which is installed at the bottom of the cylinder body.
Furthermore, a clamp spring is arranged in a clamp spring groove designed at the opening end part of the cylinder body, so that the guide seat module is positioned at the opening end part of the cylinder body.
Furthermore, a cylinder hole sealing ring, a piston outer seal and a piston guide ring are arranged on the wall of the inner cavity of the cylinder body after finish machining, so that the cylinder hole sealing ring and the piston outer seal are more reliable, the guide precision of the piston is guaranteed through the piston guide ring, an air guide rod is locked by a fine-thread nut in the center of the bottom of the cylinder body, and an air passage II is separated from a No. 2 cavity through the air guide rod sealing ring.
Furthermore, the shaft dustproof ring groove and the hole dustproof ring groove which are designed on the upper guide seat are internally provided with a shaft dustproof ring and a hole dustproof ring respectively, so that foreign matters are prevented from entering the spring.
Furthermore, the lower guide seat is provided with sealing and guiding components such as an oilless bearing, a retainer ring, a shaft sealing ring and the like, so that the piston rod can smoothly reciprocate.
Furthermore, install sealed guiding device such as air guide rod seal, sealed piece external seal, air guide rod guide ring on the sealed piece to rely on sealed piece locking screw to lock, during piston rod reciprocating linear motion, ensure that air flue two is unobstructed always with 1# cavity and separates with 2# cavity.
Furthermore, the fixed hanging table is connected with the piston and mechanically locked through the round nut and the stop washer, and the piston can be prevented from loosening in work because the inner stop piece and the outer stop piece of the stop washer are respectively embedded into the piston rod stop groove and the round nut stop groove, and the remaining stop pieces which are not embedded into the grooves are also riveted on the round nut in an overturning manner.
Furthermore, the No. 1 cavity and the No. 2 cavity can be communicated through two air paths, wherein the first air path is a one-way air path which enables air in the No. 2 cavity to flow into the No. 1 cavity through a one-way valve; the second gas path is a throttling control gas path which is controlled by a control valve and enables gas between the 1# chamber and the 2# chamber to slowly flow or stop through a gas path I, a gas path II, a gas path III, a gas path IV and a gas path V, and the throttling gas path can avoid the phenomenon that the energy releasing speed is too high due to high-pressure nitrogen in the chambers.
Furthermore, the control valve is driven by externally connecting clean compressed air to the air pipe joint, when the compressed air is introduced, the small piston at the air pipe joint is pushed to move, and the sealing block at one end of the small piston is tightly attached to the limiting valve seat, so that the air passage IV is cut off, and the throttling control air passage between the chamber No. 1 and the chamber No. 2 is disconnected; on the contrary, when compressed air is not introduced, the sealing block is not tightly attached to the limiting valve seat, so that a second air passage between the 1# chamber and the 2# chamber, namely the throttling control air passage, is communicated.
In addition, the invention also discloses an operation control method of the return stroke controllable nitrogen spring, which comprises the following steps:
A. filling: the nitrogen spring has a pressure P according to the use requirement0Nitrogen is filled through the charging and discharging port, the control valve enables the air passage four to be communicated, the 1# cavity, the 2# cavity and the air passages are kept to be communicated, the piston rod is completely ejected out of the cylinder body under the action of internal high-pressure nitrogen, and the spring is in an uncompressed natural state;
B. preparing for compression: before the outside applies pressure to the spring through the piston rod, compressed air is introduced into the air pipe joint, so that the control valve is disconnected with the air passage IV, and the throttling air passage between the 1# chamber and the 2# chamber is disconnected;
C. compression energy storage: an external pressure block applies pressure F to the spring through a piston rod, the piston rod drives the piston to enable gas in the No. 2 cavity to flow into the No. 1 cavity through the one-way valve, meanwhile, the gas in the No. 1 cavity and the No. 2 cavity is compressed to accumulate energy, and the pressure in the cavity rises along with the increase of a compression stroke; when the piston rod is pressed to the position of the lower dead point, the pressure in the cavity reaches the maximum value Pt, and the energy accumulated by the spring also reaches the maximum value;
D. locking: after the piston rod is balanced at the position of the bottom dead center, the check valve automatically cuts off the air path between the 1# chamber and the 2# chamber; then, removing the external force F acting on the piston rod, reversely ejecting the piston rod for a certain displacement, namely, the rebound quantity to achieve balance, locking the piston rod of the spring at the original compression position, and at the moment, the external force and the spring acting on the pressing block are both 0; generally, the closer the compression stroke of the piston rod is to the bottom dead center position, the smaller the volume of nitrogen in the 2# chamber is, and the smaller the rebound amount is;
E. and (3) return stroke: when the outside needs the spring to do work outwards, a return instruction is sent, the control valve is communicated with a throttling gas circuit between the 1# chamber and the 2# chamber, gas in the 1# chamber slowly flows into the 2# chamber, the compressed gas slowly pushes out the piston rod with elastic force F' to do work outwards, and the spring slowly releases accumulated energy; when the piston rod is ejected to the top dead center position, the pressure in the cavity is reduced to P0', the release of all the stored energy is finished; p0' approximately equal to P0；
F. And (3) circulating operation: working circularly according to the steps B-E.
Various control instructions related to the operation control method of the return stroke controllable nitrogen spring are on-off binary logic signals.
The invention has the beneficial effects that:
1. the piston rod of the return stroke controllable nitrogen spring is limited by the integrated fixed hanging table, the maximum stroke is always fixed, and the operation is safe, stable and reliable;
2. according to the invention, the piston of the return stroke controllable nitrogen spring is connected with the piston rod and then mechanically locked and anti-loose by adopting the round nut and the stop washer, so that the piston cannot be loosened in the working process, and the reliability is improved;
3. the piston rod of the return stroke controllable nitrogen spring is guided by the oilless bearing, and compared with a plastic guide sleeve commonly adopted in the prior art, the guide precision is high and the unbalance loading resistance is good;
4. according to the return stroke controllable nitrogen spring, the working stroke of the spring is adjusted by adding the adjusting pad between the upper guide seat and the lower guide seat, so that the stroke adjustment is more convenient, and the requirements of customers can be better met.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
FIG. 1 is a schematic diagram of a natural state of a spring after the return stroke controllable nitrogen spring of the embodiment is filled.
Fig. 2 is a schematic diagram of the internal structure of the return stroke controllable nitrogen spring in the natural state after the filling is completed in the embodiment of the return stroke controllable nitrogen spring.
FIG. 3 is a schematic view of a piston locking structure of the embodiment of the return stroke controllable nitrogen spring.
FIG. 4 is a schematic diagram illustrating a state of the return stroke controllable nitrogen spring before the external force is removed when the return stroke controllable nitrogen spring is compressed to the bottom dead center.
FIG. 5 is a schematic diagram of a locking state of the embodiment of the return stroke controllable nitrogen spring.
Fig. 6 is a schematic view of a return stroke state of the embodiment of the return stroke controllable nitrogen spring.
FIG. 7 is a timing diagram illustrating the cycle operation control of the embodiment of the return stroke controllable nitrogen spring.
The text labels in the figures are represented as: 1. a working cylinder module; 101. a cylinder body; 102. a clamp spring; 103. an air guide rod; 104. a gas guide rod sealing ring; 105. the air guide rod locks the screw; 106. a plug sealing ring; 107. blocking the cover; 108. mounting a mounting groove; 109. an air discharge port; 110. a lower mounting groove; 2. a guide seat module; 201. an upper guide seat; 202. a shaft dust ring; 203. an oilless bearing; 204. a lower guide seat; 205. a cylinder hole dust ring; 206. an adjustment pad; 207. a retainer ring; 208. a shaft seal ring; 209. a cylinder bore seal ring; 3. a piston and piston rod module; 301. a piston rod; 3011. fixing a hanging table; 3012. a piston rod stop groove; 302. a piston; 303. a piston guide ring; 304. sealing the air guide rod; 305. a sealing block; 306. the piston is sealed externally; 307. sealing the inside of the piston; 308. sealing the sealing block; 309. a gas guide rod guide ring; 310. a stop washer; 3101. an inner stopper piece; 3102. an outer stopper; 311. a round nut; 3111. a round nut stop groove; 312. locking screws of the sealing blocks; 313. fixing a hanging table; 4. a gas circuit and control valve module; 401. 1# chamber; 402. a first air passage; 403. a one-way valve; 404. an air passage II; 405. 2# chamber; 406. a gas pipe joint; 407. a small piston; 408. a control valve; 409. an air passage III; 410. sealing the plugging block; 411. a limiting valve seat; 412. an airway IV; 413. an airway five; 5. and (7) briquetting.
Detailed Description
The following detailed description of the present invention is given for the purpose of better understanding technical solutions of the present invention by those skilled in the art, and the present description is only exemplary and explanatory and should not be construed as limiting the scope of the present invention in any way.
Referring to fig. 1-6, there are shown schematic structural diagrams of a return controllable nitrogen spring according to a preferred embodiment of the present invention.
The utility model provides a controllable type nitrogen gas spring of return stroke, full of high-pressure nitrogen gas in its inside cavity, its concrete structure includes: working cylinder module 1, guide holder module 2, piston and piston rod module 3, gas circuit and control valve module 4, working cylinder module 1 constitutes the basic frame of spring, guide holder module 2 is in working cylinder module 1's opening tip piston and piston rod module 3 do reciprocal linear motion in the closed working chamber that working cylinder module 1 and guide holder module 2 constitute, it has gas circuit and control valve module 4 to embed in working cylinder module 1 and piston rod module 2, and the reciprocal linear motion of control piston and piston rod module 3 realizes anticipated function.
Preferably, as shown in fig. 1 and fig. 2, the cylinder body 101 is designed with an upper mounting groove 108, a lower mounting groove 110, a bottom screw hole and other structures, so as to facilitate mounting of the nitrogen spring in the using process; a clamp spring 102 is arranged in a clamp spring groove designed at the opening end part of the cylinder body 101, so that the guide seat module 2 is positioned at the opening end part of the cylinder body 101; after the inner cavity wall of the cylinder body 101 is subjected to finish machining, the sealing ring 209 of the cylinder hole and the outer sealing ring 306 of the piston are sealed reliably, and the guiding precision of the piston 302 can be ensured through the piston guide ring 303; a control valve 408 is installed at the bottom of the cylinder body 101, the center of the bottom is locked by a fine-toothed nut 105 to the air guide rod 103, and the air guide rod sealing ring 104 is used for ensuring that the second air passage 404 is separated from the No. 2 cavity 405; the cylinder 101 is further provided with an air charging and discharging port 109, and an air charging and discharging valve is arranged inside the cylinder so that the spring can be charged with nitrogen or discharge high-pressure nitrogen.
Preferably, as shown in fig. 2 and fig. 3, a shaft dust ring 202 and a hole dust ring 205 are respectively installed in a shaft dust ring groove and a hole dust ring groove designed on the upper guide base 201 to prevent foreign matters from entering the inside of the spring; the lower guide seat 204 is provided with sealing and guiding components such as an oilless bearing 203, a retaining ring 207, a shaft sealing ring 208 and the like, so that the piston rod 301 can smoothly reciprocate, and the oilless bearing is used, so that the guide precision is high and the unbalance loading resistance is high; an adjusting pad 206 is arranged between the upper guide seat 201 and the lower guide seat 204, and the maximum stroke of the spring can be changed within a certain range by changing the thickness of the adjusting pad 206, so that the application range of the spring is expanded.
Preferably, referring to fig. 2 and fig. 3, a fixed hanging table 313 is designed in the middle of the piston rod 301, so that the top dead center position of the stroke can be ensured to be stable and unchanged all the time; a cavity for the air guide rod 103 to move is designed in the center of the tail of the piston rod 301, a sealing block 305 is installed at the opening end of the cavity, a sealing guide device such as an air guide rod seal 304, a sealing block outer seal 308, an air guide rod guide ring 309 and the like is installed on the sealing block 305, and the sealing block is locked by a sealing block locking screw 312, so that when the piston rod 301 makes reciprocating linear motion, the air channel II 404 and the No. 1 cavity 401 are ensured to be always smooth and separated from the No. 2 cavity 405; the lower part of the fixed hanging table 313 is connected with the piston 302 and is mechanically locked by the round nut 312 and the stop washer 310, and because the inner stop piece 3101 and the outer stop piece 3102 of the stop washer 310 are respectively embedded into the piston rod stop groove 3012 and the round nut stop groove 3111, and the rest stop piece 3102 which is not embedded into the groove is also overturned to rivet the round nut 311, the piston 302 can be ensured not to be loosened in work; the piston 302 is also circumferentially provided with 4 check valves 403.
Preferably, as shown in fig. 2, the air passage and control valve module 4 is embedded in other modules, and the # 1 chamber 401 and the # 2 chamber 405 are separated by the action of each sealing member, but can be communicated through two air passages: one is a one-way air passage which enables the air in the No. 2 cavity 405 to flow into the No. 1 cavity 401 through a one-way valve 403; the second is a throttling control gas circuit which is controlled by a control valve 408 and enables gas between the 1# chamber 401 and the 2# chamber 405 to flow slowly or stop through a gas channel I402, a gas channel II 404, a gas channel III 409, a gas channel IV 412 and a gas channel V413, and the throttling gas circuit can avoid personnel and property loss caused by the fact that the energy releasing speed of high-pressure nitrogen in the chamber is too high.
Preferably, as shown in fig. 4 and 5, the control valve 408 is driven by externally connecting clean compressed air to the air pipe joint 406, and when the compressed air is introduced, the small piston 407 is pushed to move, so that the sealing block 410 is tightly attached to the limiting valve seat 411, thereby cutting off the air passage four 412 and disconnecting the throttling control air passage between the # 1 chamber 401 and the # 2 chamber 405; on the contrary, when the compressed air is not introduced, the sealing block 410 is not tightly attached to the limit valve seat 411, so that the throttle control air passage between the 1# chamber 401 and the 2# chamber 405 is communicated.
Referring to fig. 4-6, in the embodiment, the piston rod 301 of the return stroke controllable nitrogen spring is pressed into the cylinder 101 from the top dead center position through the pressing block 5 under the action of external force, so that the spring is compressed to store energy; when the piston is compressed to the stroke bottom dead center, the energy storage of the spring reaches the maximum value, the piston rod 301 is locked, and the compression state is still kept when the external force is removed; after obtaining the return command, the piston rod 301 is slowly returned to release energy. The specific operation control method comprises the following steps:
A. filling: the nitrogen spring has a pressure P according to the use requirement0Nitrogen is filled in through the charging and discharging port 109, the control valve 408 enables the air passage four 412 to be communicated, the 1# chamber 401, the 2# chamber 405 and the air passages are kept communicated, the piston rod 301 is completely ejected out of the cylinder body 101 under the action of internal high-pressure nitrogen, and the spring is in an uncompressed natural state;
B. preparing for compression: before the outside applies pressure to the spring through the piston rod, compressed air is introduced into the air pipe joint 406, so that the control valve 408 is disconnected with the air passage IV 412, and the throttling air passage between the 1# chamber 401 and the 2# chamber 405 is disconnected;
C. compression energy storage: the external pressure block 5 applies pressure F to the spring through the piston rod 301, the piston rod 301 drives the piston 302 to enable the gas in the No. 2 chamber 405 to flow into the No. 1 chamber 401 through the one-way valve 403, meanwhile, the gas in the No. 1 chamber 401 and the No. 2 chamber 405 is compressed to accumulate energy, and the pressure in the chamber rises along with the increase of a compression stroke; when the piston rod 301 is pressed to the bottom dead center position, the pressure in the cavity reaches a maximum value Pt, and the energy accumulated by the spring also reaches a maximum value;
D. locking: after the piston rod 301 is balanced at the bottom dead center position, the check valve 403 firstly automatically cuts off the air path between the 1# chamber 401 and the 2# chamber 405; then, the external force F acting on the piston rod 301 is removed, the piston rod 301 is reversely ejected for a certain displacement, namely, the rebound amount reaches balance, the piston rod 301 of the spring is locked at the original compression position, and at the moment, the external force and the acting force of the spring on the pressing block 5 are both 0; generally, the closer the piston rod is compressed to the bottom dead center position, the less the volume of nitrogen in the # 2 chamber 405 and the smaller the amount of rebound;
E. and (3) return stroke: when the outside needs the spring to do work externally, a return instruction is sent out, the control valve 408 is communicated with a throttling gas path between the 1# chamber 401 and the 2# chamber 405, gas in the 1# chamber slowly flows into the 2# chamber, compressed gas pushes the piston rod 301 out slowly with elastic force F' to do work externally, and the spring slowly releases accumulated energy; when the piston rod 301 is ejected to the top dead center position, the pressure in the cavity is reduced to P0', the release of all the stored energy is finished; p0' approximately equal to P0；
F. And (3) circulating operation: working circularly according to the steps B-E.
The return stroke controllable nitrogen spring of the embodiment circularly works according to steps B-E, the control time sequence is shown in the attached figure 7 of the specification, and t0For the start of compression, t1For compression to the bottom dead center time, t2At the moment when the pressing block 5 returns to the top dead center of the spring, t3Is the return stroke starting time, t4For the moment when the press returns to the initial position, t5The moment when the spring returns to the top dead center. In the cycle operation, the spring is rubbed, the gas is compressed repeatedly, the gas is throttled, the working frequency and the heat exchange rate with the environmentWhen the internal and external heat is balanced, the working temperature is higher than the ambient temperature.
The control instructions related in the operation control method of the embodiment are all on-off binary logic signals, and the control method is simple, convenient and reliable.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The principles and embodiments of the present invention are explained herein, and the above description of the embodiments is only used to help understand the method and its core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims (10)

1. A return stroke controllable nitrogen spring is characterized by comprising a working cylinder module (1), a guide seat module (2), a piston and piston rod module (3) and a gas path and control valve module (4), wherein the guide seat module (2) is arranged at the opening end part of the working cylinder module (1), the piston and piston rod module (3) in a closed working cavity formed by the working cylinder module (1) and the guide seat module (2) do reciprocating linear motion, the gas path and control valve module (4) is embedded in the working cylinder module (1) and the piston and piston rod module (3), and the gas path and control valve module (4) controls the reciprocating linear motion of the piston and piston rod module (3); the working cylinder module (1) comprises a cylinder body (101), wherein an upper mounting groove (108) and a lower mounting groove (110) are arranged on the cylinder body (101), and an air charging and discharging port (109) is also arranged on the cylinder body (101); the guide seat module (2) comprises an upper guide seat (201) and a lower guide seat (204), and an adjusting pad (206) is arranged between the upper guide seat (201) and the lower guide seat (204); the piston and piston rod module (3) comprises a piston rod (301) and a piston (302), the piston rod (301) is pressed into the cylinder body (101) from the top dead center position under the action of external force, a fixed hanging table (313) is designed in the middle of the piston rod (301), the fixed hanging table (313) is connected with the piston (302), a cavity for the air guide rod (103) to move is designed in the center of the tail of the piston rod (301), and a sealing block (305) is installed at the opening end part of the cavity; the air path and control valve module (4) comprises a 1# chamber (401) and a 2# chamber (405) which are formed in a cylinder body (101) in a separated mode through a piston (302), a one-way valve (403) which is circumferentially arranged on the piston (302), and a control valve (408) which is installed at the bottom of the cylinder body (101).
2. The return stroke controllable nitrogen spring as claimed in claim 1, wherein a snap spring (102) is arranged in a snap spring groove designed at the opening end of the cylinder body (101) so that the guide seat module (2) is positioned at the opening end of the cylinder body (101).
3. The return stroke controllable nitrogen spring as claimed in claim 1, wherein the inner cavity wall of the cylinder body (101) is provided with a cylinder hole sealing ring (209), a piston outer sealing ring (306) and a piston guide ring (303) after being subjected to finish machining, so that the sealing of the cylinder hole sealing ring (209) and the piston outer sealing ring (306) is more reliable, the guide precision of the piston (302) is ensured through the piston guide ring (303), the gas guide rod (103) is locked at the bottom center of the cylinder body (101) through a fine-thread nut (105), and a gas channel II (404) and a No. 2 chamber (405) are ensured to be separated through the gas guide rod sealing ring (104) therebetween.
4. The return stroke controllable nitrogen spring as claimed in claim 1, wherein the upper guide seat (201) is provided with a shaft dust ring groove and a hole dust ring groove, and a shaft dust ring (202) and a hole dust ring (205) are respectively mounted in the shaft dust ring groove and the hole dust ring groove to prevent foreign matters from entering the spring.
5. The return stroke controllable nitrogen spring as claimed in claim 1, wherein the lower guide seat (204) is provided with sealing and guiding components such as an oilless bearing (203), a retainer ring (207), a shaft seal ring (208) and the like, so that the piston rod (301) can reciprocate smoothly.
6. The return stroke controllable nitrogen spring as claimed in claim 1, wherein the sealing block (305) is provided with sealing and guiding devices such as a gas guide rod seal (304), a sealing block outer seal (308), a gas guide rod guide ring (309) and the like, and is locked by a sealing block locking screw (312), so that when the piston rod (301) moves linearly in a reciprocating manner, the gas channel II (404) is ensured to be always unobstructed with the No. 1 chamber (401) and isolated from the No. 2 chamber (405).
7. The return stroke controllable nitrogen spring as claimed in claim 1, wherein the fixed hanging platform (313) is connected with the piston (302) and mechanically locked by the round nut (312) and the stop washer (310), and the piston (302) is ensured not to be loosened in operation because the inner stop tab (3101) and the outer stop tab (3102) of the stop washer (310) are respectively embedded into the piston rod stop groove (3012) and the round nut stop groove (3111), and the rest stop tabs (3102) which are not embedded into the grooves are also turned over to rivet the round nut (311).
8. The return stroke controllable nitrogen spring as claimed in claim 1, wherein the # 1 chamber (401) and the # 2 chamber (405) are connected by two gas paths, wherein the first gas path is a one-way gas path for allowing the gas in the # 2 chamber (405) to flow into the # 1 chamber (401) through the one-way valve (403); the second gas path is a throttling control gas path which is controlled by a control valve (408) and enables gas between the 1# chamber (401) and the 2# chamber (405) to slowly flow or stop through a gas path I (402), a gas path II (404), a gas path III (409), a gas path IV (412) and a gas path V (413), and the throttling gas path can avoid the over-high energy release speed caused by high-pressure nitrogen in the chamber.
9. The return controllable nitrogen spring as claimed in claim 1 or 8, wherein the control valve (408) is driven by externally connecting clean compressed air to the air pipe joint (406), when the compressed air is introduced, the small piston (407) at the air pipe joint (406) is pushed to move, and the sealing block (410) at one end of the small piston (407) is tightly attached to the limiting valve seat (411), so that the air passage four (412) is cut off, and the throttling control air passage between the 1# chamber (401) and the 2# chamber (405) is cut off; on the contrary, when compressed air is not introduced, the sealing block (410) is not tightly attached to the limiting valve seat (411), so that a second air passage, namely the throttling control air passage, between the 1# chamber (401) and the 2# chamber (405) is communicated.
10. The operation control method of a return stroke controllable nitrogen spring as claimed in any one of claims 1 to 9, comprising the steps of:
A. filling: the nitrogen spring has a pressure P according to the use requirement0Nitrogen is filled in through the charging and discharging port (109), the air passage four (412) is communicated through the control valve (408), the 1# chamber (401), the 2# chamber (405) and the air passages are kept communicated, the piston rod (301) is completely ejected out of the cylinder body (101) under the action of internal high-pressure nitrogen, and the spring is in an uncompressed natural state;
B. preparing for compression: before the outside applies pressure to the spring through the piston rod, compressed air is introduced into the air pipe joint (406) to enable the control valve (408) to disconnect the air passage four (412), so that a throttling air passage between the 1# chamber (401) and the 2# chamber (405) is disconnected;
C. compression energy storage: an external pressure block (5) applies pressure F to the spring through a piston rod (301), the piston rod (301) drives a piston (302) to enable gas in a No. 2 chamber (405) to flow into a No. 1 chamber (401) through a one-way valve (403), meanwhile, the gas in the No. 1 chamber (401) and the No. 2 chamber (405) is compressed to accumulate energy, and the pressure in the chamber rises along with the increase of a compression stroke; when the piston rod (301) is pressed to the bottom dead center position, the pressure in the cavity reaches the maximum value PtThe energy accumulated by the spring also reaches the maximum value;
D. locking: after the piston rod (301) is balanced at the bottom dead center position, the one-way valve (403) automatically cuts off an air passage between the 1# chamber (401) and the 2# chamber (405) at first; then, removing the external force F acting on the piston rod (301), reversely ejecting the piston rod (301) for a certain displacement, namely, the rebound amount to reach balance, locking the piston rod (301) of the spring at the original compression position, and at the moment, both the external force and the external force of the spring on the pressing block (5) are 0; generally, the closer the stroke of the piston rod being compressed is to the bottom dead center position, the smaller the volume of nitrogen in the # 2 chamber (405) and the smaller the rebound amount;
E. and (3) return stroke: when the outside needs the spring to do work externally, the return finger is sent outThe control valve (408) is communicated with a throttling gas path between the 1# chamber (401) and the 2# chamber (405), gas in the 1# chamber slowly flows into the 2# chamber, compressed gas slowly pushes out the piston rod (301) with elastic force F' to do work outwards, and the spring slowly releases accumulated energy; when the piston rod (301) is ejected to the top dead center position, the pressure in the cavity is reduced to P0', the release of all the stored energy is finished; p0' approximately equal to P0；
F. And (3) circulating operation: working circularly according to the steps B-E.
CN202011607761.5A 2020-12-30 2020-12-30 Return stroke controllable nitrogen spring and operation control method Withdrawn CN112576671A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112576672A (en) * 2020-12-30 2021-03-30 邵阳兴达精密机械制造有限公司 Low-resilience return stroke controllable nitrogen spring and operation method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112576672A (en) * 2020-12-30 2021-03-30 邵阳兴达精密机械制造有限公司 Low-resilience return stroke controllable nitrogen spring and operation method
CN112576672B (en) * 2020-12-30 2024-04-30 邵阳兴达精密机械制造有限公司 Low-resilience-quantity return-stroke controllable nitrogen spring and operation method

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Application publication date: 20210330