CN110985462B - Hydraulic system for eliminating pulse test actuating cylinder and pipeline gas thereof - Google Patents
Hydraulic system for eliminating pulse test actuating cylinder and pipeline gas thereof Download PDFInfo
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- CN110985462B CN110985462B CN201911276563.2A CN201911276563A CN110985462B CN 110985462 B CN110985462 B CN 110985462B CN 201911276563 A CN201911276563 A CN 201911276563A CN 110985462 B CN110985462 B CN 110985462B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/042—Controlling the temperature of the fluid
- F15B21/0423—Cooling
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- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses a hydraulic system for removing gas in a pulse test actuating cylinder and a pipeline thereof, aiming at providing a hydraulic system for stably, reliably and effectively removing gas in a tested actuating cylinder and a hydraulic pipeline and effectively controlling the temperature of oil liquid in a test process and removing gas in the pulse test actuating cylinder and the pipeline thereof, and the hydraulic system is realized by the following technical scheme: the two-position three-way electromagnetic valve is communicated with the two-position three-way electromagnetic valve and forms a parallel loop with the rodless cavity of the tested actuating cylinder; the two-position three-way electromagnetic valve is respectively communicated with the pressure sensor P2, the temperature sensor T and the cooler connected in series on the oil return pipeline which are connected in parallel through the built-in one-way valve, and is communicated with the three-position four-way electromagnetic reversing valve through the hydraulic pipeline connected in parallel at the lower part, and the hydraulic control one-way valve and the pressure cylinder which are sequentially connected in series with the upper part of the three-position four-way electromagnetic reversing valve form a parallel loop communicated with the pressure cylinder, so that the function of circularly discharging the two cavities of the tested actuating cylinder and the gas in the hydraulic pipeline of the two cavities is realized.
Description
Technical Field
The invention relates to a hydraulic system for eliminating gas in a pulse test actuating cylinder and a pipeline thereof.
Background
Hydraulic systems are important systems on aerospace products. The hydraulic system on the airplane is mainly applied to retraction of an airplane undercarriage and a speed reduction plate; the control of a flap, an aileron, a horizontal tail and a rudder, an air inlet cone, the adjustment of an auxiliary air inlet valve and the like. Because the hydraulic system has the factors of high pressure, precise accessory processing, easy leakage of oil and the like, the faults are more, and most of the faults are related to the pressure pulse of the hydraulic system. When a hydraulic system works, because of sudden change of flow or flow direction and the like, the transmission of pressure waves enables the pressure fluctuation peak value of a hydraulic pipeline to be far larger than a rated value, strong pressure impact occurs, and the normal work of a product is damaged, and the phenomenon is called as pressure pulse. Relevant investigations have shown that hydraulic system failures account for about 40% of the total number of machine failures, and in severe-grade accidents, about 15% to 20% are caused by hydraulic systems. Hydraulic system failures are due in large part to the pulsating pressure generated during operation of the hydraulic components, so that the lines and accessories of the hydraulic system must be pressure pulse tested. The pulse test equipment is used for pressure pulse tests of tested actuating cylinders or other hydraulic accessories, and mainly simulates the actual installation working condition of tested products and examines whether the products have enough capacity to bear pulse pressure within the total life cycle range. The pulse frequency of each test of the equipment is generally tens of thousands of times, the maximum number of times can reach one million, and the system structure is complex.
The actuator cylinder pulse test equipment is a complex nonlinear system, the control method of the actuator cylinder pulse test equipment is greatly different from that of a traditional linear system, the difficulty is mainly focused on physical realization of the whole system and a complex pipeline system, and due to the fact that the test pressure of a hydraulic system of a test bed is high, the instantaneous flow required for realizing pressure pulse is also large, the physical realization of the whole system and the complex pipeline system need to be considered, and the problems of system exhaust, oil temperature control and the like need to be considered. The pressure pulse test bed of the actuating cylinder is mainly divided into five parts, namely a hydraulic source system, a pulse generating device, an oil supplementing hydraulic system, an installation rack, a control system and the like. The working principle is that the impulse principle of pressure wave in the hydraulic transmission process is utilized to cause the instantaneous pressure of a product to exceed the rated working pressure of a system with a certain multiple, and then the product is quickly attenuated to be similar to a second-order oscillation curve (commonly called a water hammer curve) of an underdamped system, wherein the power source of a pulse generating device is from a hydraulic oil source, an oil supplementing hydraulic system supplements oil required by a test for a small cavity (a high-pressure cavity) of a pressure cylinder and a rear end test pipeline thereof as the name suggests, and a control system is used for monitoring the state of pulse equipment and adjusting parameters of the pulse equipment and the waveform thereof so that the pulse waveform of the tested product meets the standard requirement. In the test process, due to compressibility of oil and elastic deformation of a test piece, enough oil needs to be supplemented to generate a required pressure rising slope and a required pressure peak value, the pressure change rate is high, the pressure reaches 1400MPa per second, and the required instantaneous oil supplementing flow is also high. In order to enhance the reliability and safety of the hydraulic pulse generating device during the working process and prolong the service life of the pulse testing system, an energy accumulator and a pressure booster are adopted in the hydraulic pulse generating device. Thus, a larger pulse test pressure can be obtained with a smaller oil source pressure. An energy accumulator in the hydraulic source system is used for supplementing the instantaneous large flow required during pulse, and an oil source stores hydraulic energy into the energy accumulator in a working pressure stabilizing section and a back pressure section of a pulse curve; during the rise, the accumulator then releases the stored hydraulic energy to produce the desired rise slope and peak. Because the control of the water hammer waves is influenced by various factors, the rising slope of the water hammer waves is larger, the instantaneous flow in the rising stage is large, the point tracking control of the water hammer wave waveform is unlikely to be realized by a servo valve with good dynamic performance, and the water hammer waves can be generated only by utilizing the water hammer phenomenon. After the mechanical structure of the system is determined, characteristic parameters such as the peak value, the slope, the rated pressure and the like of a water hammer wave are calculated firstly, whether the waveform is in a shadow area range specified by a specification or not is judged, and then the opening of a proportional throttle valve, the pressure of a main oil source, the dynamic characteristic of a proportional reversing valve and the like are adjusted to ensure that the waveform meets the specification requirement.
The pulse test indexes of the dynamic performance parameters of the pressure of the actuating cylinder under different working conditions mainly comprise: the peak pressure of the pulse test is 150 percent of the rated working pressure of the product, the cycle frequency is 60-90 times per minute, the pressure rise rate is 1400-2100 MPa per second, and the test times are 20000 times. The pressure pulse cycle is performed in each of two positions, piston rod extension and retraction (piston rod should be bottomed).
As shown in figure 2, the pressure oil of the traditional pulse test bed oil-supplementing hydraulic system directly supplements oil to a test cavity of a tested actuating cylinder after passing through a precision oil filter, a stop valve and a one-way valve. In the test process, the length of a pipeline between the pressure cylinder and the tested piece, the section of the conduit, the size of the cavity of the tested piece and the like can have great influence on the hydraulic pulse waveform, the slope of the hydraulic pulse waveform is required to be larger than the minimum slope required by the waveform, and the peak value of the hydraulic pulse waveform is larger than the required peak pressure. Because the tail end of the test section is closed, the temperature of the oil liquid in the pulse test can be rapidly increased along with the test time, and the highest temperature exceeds 200 ℃. Because of the life-span of high temperature fluid meeting greatly reduced product, to the condition of experimental fluid temperature superelevation, can only adopt fan etc. to carry out physics cooling to the product, wait after the temperature drops to the normal atmospheric temperature, restart the experiment again, seriously influenced test quality and efficiency of software testing. Since the high pressure of the pulse test pressure does not reach the pressure required by the test, the low pressure (back pressure) exceeds the pressure required by the test, which can cause the pulse pressure curve to be unsatisfactory: aiming at the problems in the test, the test can be started again only by frequently stopping the test manually and adjusting and cooling the test equipment. Because the hydraulic system does not have the functions of automatic exhaust and temperature control, the connection interface between the tested actuating cylinder and the test bed is not detached by manually loosening, a part of oil is released and gas in the oil is exhausted, and then the connection interface is screwed again, so that the aims of exhausting and reducing back pressure are fulfilled.
By analyzing the principle and the phenomenon of the pulse test, the method has the following steps: during the pulse is experimental, the chamber of being tried is a dead space, along with the increase of experimental number of times, the reciprocating motion of pressure cylinder, and can convert into heat energy because of a large amount of mechanical energy in the testing process, the temperature of experimental fluid can increase, and gas molecule motion aggravation dissolves can more release in experimental fluid, causes the fluid of certain flow to be unable to reach the wave form that experimental requirement is produced in the pipeline of length is decided to the pressure wave form of instantaneous impact. Therefore, whether the exhaust completely influences the generation of the pressure waveform directly is a key control point of the test quality and the test efficiency.
The invention mainly aims at the improvement of an oil-supplementing hydraulic system of a pressure pulse test bed.
Disclosure of Invention
The invention aims to provide a hydraulic system for stably, reliably and effectively removing gas in a tested actuating cylinder and a hydraulic pipeline and effectively controlling the temperature of oil liquid in the test process for removing the gas in the actuating cylinder and the pipeline of the pulse test aiming at the defects in the existing pulse test, so that the hydraulic oil supplementing system can automatically supplement and exhaust oil, is convenient to operate, and solves the problems that the pulse test pressure is not qualified due to excessive gas in a test cavity in the pulse test process and the temperature of the pulse test oil is continuously raised and uncontrollable.
The invention solves the technical problem and adopts the technical scheme that a hydraulic system for eliminating the gas of a pulse test actuating cylinder and a pipeline thereof comprises: the pressure cylinder 5 communicated with a rodless cavity of the tested actuating cylinder 7 through a hydraulic pipeline, the two-position three-way electromagnetic valve 10 communicated with a rod cavity of the tested actuating cylinder 7, and a pressure sensor P2 and a temperature sensor T which are connected to a bypass pipeline between the tested actuating cylinder 7 and the hydraulic pipeline of the pressure cylinder 5 are characterized in that: the two-position three-way electromagnetic valve 10 is communicated with the two-position three-way electromagnetic valve 6, forms a parallel loop with a rodless cavity of the tested actuating cylinder 7, and is communicated with the precision oil filter 1 through a pressure sensor P1 which is connected by the lower one-way valve 2; the two-position three-way electromagnetic valve 6 is respectively communicated with the pressure sensor P2, the temperature sensor T and the cooler 11 which are connected in series on the oil return pipeline in parallel through the built-in one-way valve, is communicated with the three-position four-way electromagnetic reversing valve 3 through the hydraulic pipeline which is connected in parallel at the lower part, and is sequentially connected with the hydraulic control one-way valve 4 and the pressure cylinder 5 which are connected in series at the upper part of the three-position four-way electromagnetic reversing valve 3 to form a parallel loop which is communicated with the pressure cylinder 5, thereby realizing the function of circularly discharging gas in the two cavities of the tested actuating cylinder 7 and the hydraulic pipeline thereof by the oil liquid in the two cavities of the tested actuating cylinder 7.
Compared with the prior art, the invention has the following beneficial effects.
The invention adopts a two-position three-way electromagnetic valve to communicate with a two-position three-way electromagnetic valve, forms a parallel loop with a rodless cavity of a tested actuating cylinder, adds three reversing valves of a three-position four-way electromagnetic reversing valve (3), the two-position three-way electromagnetic valve and the two-position three-way electromagnetic valve in an oil supplementing hydraulic system consisting of a pressure cylinder, the tested actuating cylinder, a valve member and the like, and forms an oil circulating loop with different functions and capable of effectively controlling the temperature of tested oil liquid by logically controlling the three electromagnetic reversing valves according to a certain rule, thereby achieving the effects of controlling the oil temperature and exhausting the product performance more accurately. The problem of among the prior art because the air influence that exists in the pipeline, the high pressure of pulse test pressure can not reach the pressure of experimental requirement, and the low pressure of pulse test pressure exceeds the pressure of experimental requirement, leads to pulse test pressure curve not conform to the requirements to and the pulse test oil temperature lasts and rises uncontrollably is solved. Meanwhile, the function of automatically supplementing oil due to the fact that the pressure does not meet the test requirement can be achieved. The normal operation of the pulse test is ensured.
Drawings
FIG. 1 is a schematic diagram of the hydraulic system of the present invention excluding the impulse test ram and its piping.
Fig. 2 is a schematic diagram of an oil-replenishing hydraulic system before the improvement of the invention.
In the figure: the system comprises a precision oil filter 1, a one-way valve 2, a three-position four-way electromagnetic directional valve 3, a hydraulic control one-way valve 4, a pressure cylinder 5, a two-position three-way electromagnetic valve 6, a tested actuating cylinder 7, a rodless cavity communicating joint 8, a rod cavity communicating joint 9, a two-position three-way electromagnetic valve 10 and a cooler 11.
The invention is explained in detail below with reference to the schematic diagram:
Detailed Description
[ refer to FIG. 1. In a preferred embodiment described below, a hydraulic system for venting a pulse test ram and its conduit includes: the pressure cylinder 5 communicated with the rodless cavity of the tested actuating cylinder 7 through a hydraulic pipeline, the two-position three-way electromagnetic valve 10 communicated with the rod cavity of the tested actuating cylinder 7, and a pressure sensor P2 and a temperature sensor T which are connected to a bypass pipeline between the tested actuating cylinder 7 and the hydraulic pipeline of the pressure cylinder 5, wherein: the two-position three-way electromagnetic valve 10 is communicated with the two-position three-way electromagnetic valve 6, forms a parallel loop with a rodless cavity of the tested actuating cylinder 7, and is communicated with the precision oil filter 1 through a pressure sensor P1 which is connected by the lower one-way valve 2; the two-position three-way electromagnetic valve 6 is respectively communicated with the pressure sensor P2, the temperature sensor T and the cooler 11 which are connected in series on the oil return pipeline in parallel through the built-in one-way valve, is communicated with the three-position four-way electromagnetic reversing valve 3 through the hydraulic pipeline which is connected in parallel at the lower part, and is sequentially connected with the hydraulic control one-way valve 4 and the pressure cylinder 5 which are connected in series at the upper part of the three-position four-way electromagnetic reversing valve 3 to form a parallel loop which is communicated with the pressure cylinder 5, thereby realizing the function of circularly discharging gas in the two cavities of the tested actuating cylinder 7 and the hydraulic pipeline thereof by the oil liquid in the two cavities of the tested actuating cylinder 7.
The precision oil filter 1 directly sends the inlet oil P to the three-position four-way electromagnetic directional valve 3 through a pressure sensor P1 of a hydraulic pipeline bypass, and under the action of a pressure control oil path of the three-position four-way electromagnetic directional valve 3, the inlet oil P is sent to the pressure cylinder 5 through a path of the hydraulic control one-way valve 4, the pressure cylinder 5 is communicated and connected with the pressure sensor P2 and the temperature sensor T through the hydraulic pipeline bypass, and then is sent to a rodless cavity of the tested actuating cylinder 7 through a rodless cavity communication joint 8, and a piston rod of the tested actuating cylinder 7 is driven to extend out; the hydraulic oil pushed out by the piston rod passes through a rod cavity of the tested actuating cylinder 7, is sent into a two-position three-way electromagnetic valve 10 through a rod cavity communicating joint 9 and returns to an oil tank R through a cooler 11 on a branch of an oil return pipeline, and similarly, the oil inlet P is sent into the rod cavity of the tested actuating cylinder 7 through a one-way valve 2 and the rod cavity communicating joint 9 under the action of a pressure control oil path of the two-position three-way electromagnetic directional valve 10 to drive the piston rod of the tested actuating cylinder 7 to retract; the hydraulic oil flowing out through the rod cavity communicating joint 9 returns to the oil tank R through the cooler 11 on the oil return pipeline branch by the connected two-position three-way electromagnetic valve 6.
The pulse test working principle of the tested actuating cylinder product is as follows: the hydraulic oil pumped by the main oil source in the hydraulic system enters the large cavity of the pressure cylinder, and the pressure is increased to the pressure required by the test through the pressurization effect of the pressure cylinder and acts on the test cavity of the tested actuating cylinder 7. The pulse test is completed by the principle that pulse impact is realized in a hydraulic pipeline and then the pulse impact is quickly attenuated by controlling a main oil source hydraulic system.
In an optional embodiment, for example, when the connection joint 9 of the rod cavity of the tested actuating cylinder 7 is disconnected and the rodless cavity performs a pulse test, when the pulse pressure sensor P2 monitors that the pressure value of the test hydraulic oil entering the rodless cavity of the tested actuating cylinder 7 exceeds the set value of the pulse pressure peak value, the safety valve of the main oil source hydraulic system controls and adjusts the pressure at the front end of the pressure cylinder, so as to ensure that the pulse test pressure value of the product is stable.
When the pulse pressure sensor P2 monitors that the pressure value and the pressure rise rate of the test oil entering the rodless cavity of the tested actuating cylinder 7 do not reach the pulse test requirement value or the backpressure of the pressure curve waveform exceeds the test set value, system exhaust is required to be performed to ensure the smooth performance of the pulse test.
When the temperature sensor T monitors that the temperature of the test oil in the rodless cavity of the tested actuating cylinder 7 exceeds a test set value, the test oil needs to be cooled or the test needs to be suspended, and the system changes oil to ensure the smooth operation of the pulse test.
The principle of the exhaust function of the double-cavity access hydraulic system of the actuated cylinder to be tested is as follows: the piston rod of the tested actuating cylinder moves, oil in two cavities of the actuating cylinder circulates, and air in two cavities of an oil pipeline and a tested actuating cylinder product returns to an oil tank, so that the exhaust function is achieved. Before a pulse test is started, when system exhaust is needed, a test bed control system sends an instruction, at the moment, an electromagnetic valve YA1 of a three-position four-way electromagnetic directional valve 3 and an electromagnetic valve YA4 of a two-position three-way electromagnetic valve 10 are powered on, an electromagnetic valve YA3 of a two-position three-way electromagnetic valve 6 is powered off, hydraulic oil enters a small cavity of a pressure cylinder 5 through the three-position four-way electromagnetic directional valve 3 and a hydraulic control one-way valve 4, and a rodless cavity of a cylinder 7 is tested; the oil liquid in the rod cavity of the tested actuating cylinder 7 returns to the oil tank through a cooler 11 connected with a two-position three-way electromagnetic valve 10, and the piston rod extending function of the tested actuating cylinder 7 in the state shown in the figure is realized. Similarly, the test bed control system sends out an instruction, the electromagnetic valve YA2 of the three-position four-way electromagnetic directional valve 3, the electromagnetic valve YA3 of the two-position three-way electromagnetic valve 6 are powered on, the electromagnetic valve YA4 of the two-position three-way electromagnetic valve 10 is powered off, hydraulic oil of the hydraulic system enters the rod cavity of the tested actuating cylinder 7 through the one-way valve 2 and the two-position three-way electromagnetic valve 10, one path of oil in the rodless cavity of the tested actuating cylinder 7 is communicated with the two-position three-way electromagnetic valve 6 through a hydraulic pipeline and returns to an oil tank through the cooler 11 connected in series on an oil return pipeline, the other path opens a passage from the pressure cylinder 5 to the hydraulic control one-way valve 4 under the action of the pressure control oil path, the hydraulic oil passes through the pressure cylinder 5, the hydraulic control one-way valve 4 and the three-position four-way electromagnetic directional valve 3 and passes through the cooler 11 connected in series on the oil return pipeline to the oil return tank, the piston rod retraction function of the tested actuating cylinder 7 is realized, thereby realizing the two-cavity oil circulation of the tested actuating cylinder 7, the function of removing the gas in the two cavities of the tested actuating cylinder 7 and the hydraulic pipeline is achieved. The test method solves the problem that before the pulse test of the prior product, the product needs to be taken to other test beds for the cycle work test to exhaust the gas in the container. Meanwhile, the problem that gas in the pipeline cannot be effectively discharged is solved. In addition, the direction of an oil pipe connected into the small cavity of the pressure cylinder 5 in the field construction process needs to be considered, and the gas in the pipeline can be effectively discharged only by connecting the oil pipe from the upper end of the small cavity of the pressure cylinder 5.
The oil-replenishing and air-discharging function will be described with respect to a pulse test performed on a single chamber of the cylinder 7 to be tested. Taking the example that the connection joint 9 of the rod cavity of the tested actuating cylinder 7 is disconnected and the pulse test is carried out in the rodless cavity), when the high-pressure signal detected by the pressure sensor P2 at the front end of the tested actuating cylinder 7 is lower than the set value of the peak value of the hydraulic pressure pulse, or when the low-pressure signal detected by the pressure sensor P2 at the front end of the tested actuating cylinder 7 exceeds the set value of the minimum hydraulic pressure (such as 1MPa), the reason is that the gas in the test cavity or the pipeline is too much along with the increase of the test times. At the moment, the test bed control system sends out an instruction, the electromagnetic valve YA1 of the three-position four-way electromagnetic directional valve 3 is powered on, the electromagnetic valve YA3 of the two-position three-way electromagnetic valve 6 is powered off, and hydraulic oil enters a small cavity of the pressure cylinder 5 and a rodless cavity of the tested actuating cylinder 7 through the three-position four-way electromagnetic directional valve 3 and the hydraulic control one-way valve 4; then, the electromagnetic valve YA3 of the two-position three-way electromagnetic valve 6 is electrified, and the oil liquid in the rodless cavity of the tested actuating cylinder 7 returns to the oil tank through the two-position three-way electromagnetic valve 6 and the cooler 11, so that the oil supplementing and exhausting functions of the rodless cavity of the tested actuating cylinder 7 are realized.
Because a large amount of mechanical energy is converted into heat energy in the pulse test, the temperature of oil in the cavity of the tested actuating cylinder and the connecting pipeline is continuously increased along with the increase of the test time, and the highest possibility is over 200 ℃. In order to control the temperature of the test oil, the present embodiment adopts the signal of the temperature sensor to perform the feedback closed-loop control to realize the control function of the temperature of the test product oil. The method can be divided into two methods of temperature control and test suspension in the test process and temperature control by changing oil of a hydraulic system.
Temperature control during the test: during the pulse test, when the temperature sensor T at the front end of the tested actuating cylinder 7 detects that the oil temperature of the pulse test cavity of the tested actuating cylinder 7 exceeds the set value of the test requirement, the test bed control system sends out an instruction, the water inlet valve of the cooler is opened, cold water uninterruptedly enters and flows out of the cooler, and the oil temperature is cooled through heat exchange. If the temperature of the oil liquid continues to rise, when the temperature of the oil liquid exceeds a second set value set in the test, the product test of the tested actuating cylinder is suspended, the hydraulic system automatically changes the oil of the product, at the moment, the electromagnetic valve YA1 of the three-position four-way electromagnetic reversing valve 3 is electrified, the normal-temperature hydraulic oil in the oil tank enters the small cavity of the pressure cylinder 5 through the three-position four-way electromagnetic reversing valve 3 and the hydraulic control one-way valve 4, the rodless cavity of the tested actuating cylinder 7 moves, and the piston of the pressure cylinder moves until the small cavity of the pressure cylinder is completely filled with the oil liquid. Then, the electromagnetic valve YA3 of the two-position three-way electromagnetic valve 6 is electrified, the test bed control system controls the piston of the pressure cylinder to move rightwards, and the high-temperature oil in the rodless cavity of the tested actuating cylinder 7 and the pipeline passes through the two-position three-way electromagnetic valve 6 and the cooler 11 to the oil return tank. After the circulating action is carried out for a plurality of times, high-temperature oil in the rodless cavity and the pipeline of the tested actuating cylinder product can be gradually replaced by normal-temperature oil, and when the temperature sensor detects that the temperature of the oil reaches the set temperature, the test of the tested actuating cylinder product is automatically continued.
The present invention has been described in detail. The present schematic is described in detail herein by discussing specific embodiments. The invention relates to a pulse test for products other than actuating cylinders, such as pressure accumulators and booster products, which can be modified in a targeted manner in specific embodiments according to the inventive idea.
Claims (10)
1. A hydraulic system for venting impulse test rams and associated piping, comprising: through hydraulic pressure pipeline intercommunication pressurized cylinder (5) and the first two-position three solenoid valve (10) that intercommunication tested actuating cylinder (7) has the pole chamber of tested actuating cylinder (7) rodless chamber to and connect pressure sensor P2 and temperature sensor T on the bypass pipeline between tested actuating cylinder (7) rodless chamber and pressurized cylinder (5) loculus, its characterized in that: the first two-position three-way electromagnetic valve (10) is connected with the second two-position three-way electromagnetic valve (6) in parallel, the second two-position three-way electromagnetic valve (6) is communicated with a rodless cavity of the tested actuating cylinder (7), and the first two-position three-way electromagnetic valve (10) is communicated with the precision oil filter (1) through a pressure sensor P1 which is connected beside the check valve (2) at the lower part; the second two-position three-way electromagnetic valve (6) is respectively communicated with a pressure sensor P2, a temperature sensor T and a cooler (11) which are connected in series on an oil return pipeline in parallel through built-in one-way valves, the second two-position three-way electromagnetic valve (6) is communicated with a three-position four-way electromagnetic reversing valve (3) through a hydraulic pipeline connected in parallel at the lower part, the second two-position three-way electromagnetic valve and the booster cylinder (5) sequentially and serially connected at the upper part of the three-position four-way electromagnetic reversing valve (3) form a parallel loop communicated with a small cavity of the booster cylinder (5), a hydraulic control end of the hydraulic control one-way valve (4) is communicated with a hydraulic pipeline between a first two-position three-way electromagnetic valve (10) and a rod cavity of the tested actuating cylinder (7), and the hydraulic system realizes oil-liquid circulation of the two cavities of the tested actuating cylinder (7) and achieves the function of removing the two cavities of the tested actuating cylinder (7) and gas in the hydraulic pipeline.
2. The hydraulic system for venting a pulse test ram and its associated line gas of claim 1, wherein: the precision oil filter (1) directly sends the inlet oil P into the three-position four-way electromagnetic directional valve (3) through a pressure sensor P1 by-pass of a hydraulic pipeline and then sends the inlet oil P into the pressure cylinder (5) through a passage of a hydraulic control one-way valve (4), the pressure cylinder (5) is communicated with the pressure sensor P2 and the temperature sensor T which are connected together in parallel through the hydraulic pipeline by-pass, and hydraulic oil output by the pressure cylinder (5) is sent into a rodless cavity of the tested actuating cylinder (7) through a rodless cavity communicating joint (8) of the tested actuating cylinder (7) to drive a piston rod of the tested actuating cylinder (7) to extend out.
3. The hydraulic system for venting a pulse test ram and its associated line gas of claim 2, wherein: the hydraulic oil pushed out by the piston rod of the tested actuating cylinder (7) passes through the rod cavity of the tested actuating cylinder (7), is sent into the first two-position three-way electromagnetic valve (10) through the rod cavity communicating joint (9), and then returns to the oil tank R through the cooler (11) on the oil return pipeline.
4. A hydraulic system for exhausting impulse test rams and associated piping as claimed in claim 3 wherein: the oil inlet P is sent into a rod cavity of the tested actuating cylinder (7) through the one-way valve (2) and the first two-position three-way electromagnetic valve (10) to drive a piston rod of the tested actuating cylinder (7) to retract; the hydraulic oil flowing out through the rodless cavity communicating joint (8) returns to the oil tank R through a cooler (11) on an oil return pipeline through a second two-position three-way electromagnetic valve (6).
5. The hydraulic system for venting a pulse test ram and its associated line gas of claim 1, wherein: the hydraulic oil pumped by a main oil source in the hydraulic system enters a large cavity of a pressure cylinder, the pressure is increased to the pressure required by the test under the pressure boosting action of the pressure cylinder and acts on a rodless cavity of a tested actuating cylinder (7) serving as a test cavity to control the main oil source hydraulic system, pulse impact is realized in a hydraulic pipeline, and then the pulse impact is quickly attenuated to finish the pulse test.
6. The hydraulic system for venting a pulse test ram and its associated line gas of claim 1, wherein: and (3) disconnecting the communicating joint (9) with the rod cavity of the tested actuating cylinder (7), carrying out pulse test on the rodless cavity, and when the pulse pressure sensor P2 monitors that the pressure value of the test hydraulic oil entering the rodless cavity of the tested actuating cylinder (7) exceeds the set value of the pulse pressure peak value, controlling and adjusting the pressure at the front end of the pressure cylinder by the safety valve of the main oil source hydraulic system, and keeping the pulse test pressure value stable.
7. The hydraulic system for venting a pulse test ram and its associated line gas of claim 1, wherein: when the pulse pressure sensor P2 monitors that the pressure value and the pressure rising rate of the test hydraulic oil entering the rodless cavity of the tested actuating cylinder (7) do not reach the pulse test requirement value or the backpressure of the pressure curve waveform exceeds the test set value, the hydraulic pipeline system is exhausted to ensure the smooth operation of the pulse test.
8. The hydraulic system for venting a pulse test ram and its associated line gas of claim 1, wherein: before a pulse test is started, when system exhaust is needed, a test bed control system sends out an instruction, an electromagnet YA1 of a three-position four-way electromagnetic directional valve (3) and an electromagnet YA4 of a first two-position three-way electromagnetic valve (10) are powered on, an electromagnet YA3 of a second two-position three-way electromagnetic valve (6) is powered off, hydraulic oil enters a small cavity of a boosting cylinder (5) and a rodless cavity of a tested actuating cylinder (7) through the three-position four-way electromagnetic directional valve (3) and a hydraulic control one-way valve (4), the hydraulic oil of a rod cavity of the tested actuating cylinder (7) returns to an oil tank R through a cooler (11) connected with the first two-position three-way electromagnetic valve (10), and the piston rod extending function of the tested actuating cylinder (7) is achieved.
9. The hydraulic system for venting a pulse test ram and its associated line gas of claim 1, wherein: the test bed control system sends out an instruction, an electromagnet YA2 of the three-position four-way electromagnetic reversing valve (3), an electromagnet YA3 of the second two-position three-way electromagnetic valve (6) are powered on, an electromagnet YA4 of the first two-position three-way electromagnetic valve (10) is powered off, hydraulic oil of the hydraulic system enters a rod cavity of the tested actuating cylinder (7) through the check valve (2) and the first two-position three-way electromagnetic valve (10), one path of the hydraulic oil of a rodless cavity of the tested actuating cylinder (7) returns to an oil tank R through a cooler (11) on an oil return pipeline after passing through the second two-position three-way electromagnetic valve (6) communicated with the hydraulic pipeline, the other path of the hydraulic oil returns to the oil tank R through a booster cylinder (5), a hydraulic control check valve (4) and the three-position four-way electromagnetic reversing valve (3), and the piston rod retraction function of the tested actuating cylinder (7) is realized.
10. The hydraulic system for venting a pulse test ram and its associated line gas of claim 1, wherein: when the temperature control pulse test in the test process is carried out, when the temperature sensor T at the front end of the tested actuating cylinder (7) detects that the temperature of the pulse hydraulic oil in the rodless cavity of the tested actuating cylinder (7) exceeds a value set by the test requirement, the test bed control system sends an instruction, a water inlet valve of a cooler is opened, cold water continuously enters and flows out of the cooler, the temperature of the hydraulic oil is cooled through heat exchange, the temperature of the hydraulic oil is continuously increased, when the temperature of the hydraulic oil exceeds a second set value set by the test, the test of the tested actuating cylinder is suspended, the hydraulic system automatically carries out oil change, an electromagnet YA1 of a three-position four-way electromagnetic directional valve (3) is electrified, normal-temperature hydraulic oil in an oil tank R enters a small cavity of a booster cylinder (5), the rodless cavity of the tested actuating cylinder (7) and a booster cylinder piston moves through the three-position four-way electromagnetic directional valve (3) and a hydraulic control one-way valve (4), until the small cavity of the pressure cylinder is completely filled with hydraulic oil, then the electromagnet YA3 of the second two-position three-way electromagnetic valve (6) is electrified, the test bed control system controls the piston of the pressure cylinder to move rightwards, and high-temperature oil in the rodless cavity of the tested actuating cylinder (7) and the pipeline returns to the oil tank R through the second two-position three-way electromagnetic valve (6) and the cooler (11).
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| CN112610174B (en) * | 2020-11-18 | 2022-08-02 | 中海油田服务股份有限公司 | Fluid circulation test system and measurement method |
| CN112816334B (en) * | 2020-12-31 | 2022-11-11 | 四川太平洋药业有限责任公司 | Infusion bag sealing performance detection instrument and detection method |
| CN114509248A (en) * | 2021-12-31 | 2022-05-17 | 天津航天瑞莱科技有限公司 | Aircraft undercarriage pressurized strut test system |
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