CN109612838B - Pipe joint pressure-resistant fatigue test device and test method - Google Patents
Pipe joint pressure-resistant fatigue test device and test method Download PDFInfo
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- CN109612838B CN109612838B CN201811579202.0A CN201811579202A CN109612838B CN 109612838 B CN109612838 B CN 109612838B CN 201811579202 A CN201811579202 A CN 201811579202A CN 109612838 B CN109612838 B CN 109612838B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0041—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress
- G01M5/005—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress by means of external apparatus, e.g. test benches or portable test systems
- G01M5/0058—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress by means of external apparatus, e.g. test benches or portable test systems of elongated objects, e.g. pipes, masts, towers or railways
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0274—Tubular or ring-shaped specimens
Abstract
The invention provides a pipe joint pressure-resistant fatigue test device which comprises a support frame, a pressure generating device, a pressure transmitting device, a pressure converting device and a counting detection device, wherein the pressure generating device, the pressure transmitting device, the pressure converting device and the counting detection device are respectively arranged on the support frame. The support frame is an experimental operating platform designed by thickened aluminum profiles according to the installation positions of the devices; the pressure generating device comprises a set of driving motor, a cam and a hydraulic cylinder; the pressure transmission device comprises a first oil pipe and a second oil pipe, and the pressure conversion device comprises a pressure-resistant gas tank with definite internal volume condition and a high-pressure one-way inflation valve; the counting detection device comprises a Hall sensing electronic counter and a pressure gauge. The invention has high detection efficiency and precision; the structure is simple, the operation is convenient, the cost is low, the manpower and material resources are saved, the working process is safe and reliable, and the repeatability is strong.
Description
Technical Field
The invention belongs to the field of performance detection experiment devices, and particularly relates to a pipe joint pressure-resistant fatigue test device.
Background
Pipe joints (Pipe joints) are parts for connecting pipes or mounting pipes to hydraulic components in a hydraulic system, and are a generic term for a connecting member that can be attached and detached in a fluid passage, and mainly include: welding, ferrule and flared.
With the increasing application of various hoses and pipe connectors in the industrial field, the detection requirements for the compressive strength and the fatigue life of the pipe are also increasingly strict. The existing detection test equipment mainly adopts valve control pressure circulation, and the hydraulic reversing valve is expensive, short in service life, sensitive to oil pollution and complex in driving, and cannot meet the requirement of high circulating pressure frequency in the same environment, so that the test device is complex, the cost is too high, the pressure circulation is too slow, and the efficiency is low.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a novel pipe joint pressure-resistant fatigue test device which adopts a motor to drive pressure circulation, and has the advantages of rapid circulation, adjustable period and simple operation.
Specifically, the invention provides a pipe joint pressure-resistant fatigue test device, which comprises a support frame, a pressure generating device, a pressure transmitting device, a pressure conversion device and a counting detection device, wherein the pressure generating device, the pressure transmitting device, the pressure conversion device and the counting detection device are respectively arranged on the support frame,
the pressure generating device comprises a cam, a driving motor and a hydraulic cylinder, an output shaft of the driving motor is connected with the cam, the driving motor drives a piston rod of the hydraulic cylinder to move up and down by means of the cam so as to form circulating pressure in the pipeline,
the pressure transmission device comprises a first oil pipe and a second oil pipe, the first oil pipe is connected with a rod cavity oil port of the hydraulic cylinder, the second oil pipe is connected with a rodless cavity oil port of the hydraulic cylinder, the second oil pipe is connected with a first end part of a first tee pipe joint, a second end part of the first tee pipe joint is connected with the pressure conversion device by means of a third oil pipe, a third end of the first tee pipe joint is connected with the test piece,
the pressure conversion device comprises an air tank and an inflation one-way valve, the inflation one-way valve is connected to the first end part of the air tank, the second end part of the air tank and a third oil pipe are respectively connected to the two end parts of a second three-way pipe joint,
the counting detection device comprises a pressure gauge and a counter, the pressure gauge is arranged at the residual end part of the second pipe joint on the oil path between the gas tank and the test piece, the counter is arranged opposite to the cam, a magnet is arranged on the outer surface of the cam opposite to the counter, an induction joint of the counter is opposite to the magnet, and the distance between the magnet and the induction joint is larger than zero and smaller than 10 mm.
Preferably, the pressure gauge is controlled to start or close by a ball valve.
Preferably, the cam is circular, and the inner hole of the cam is eccentric by 4 mm.
Preferably, the driving motor is a stepless speed regulation speed reduction motor, the speed regulation range of the stepless speed regulation speed reduction motor is 200-1000r/min, and the inner diameter of the hydraulic cylinder is 32 mm.
Preferably, the first oil pipe and the second oil pipe are both single-layer steel wire hoses.
Preferably, the gas pitcher is formed by seamless steel pipe welding, the upper end welding of gas pitcher has the screw thread subassembly that aerifys the check valve and match with M8, through the gaseous conversion that produces interior energy and the kinetic energy of messenger's system in the compressed gas jar to produce pressure cycle, pressure change adjusts through the proportion of regulation and control interior fluid of gas pitcher and air.
Preferably, the timer is a hall induction counter.
Preferably, the first oil pipe is suspended by means of a suspension device, and the height of the added oil is 1/3 of the height of the first oil pipe.
Preferably, the invention also provides a pipe joint pressure-resistant fatigue test method, which comprises the following steps:
s1, before testing, the gas volume to be reserved in the gas tank is calculated through a gas adiabatic compression equation, the inflation check valve is screwed down after oil is added to a preset position, the cam is rotated to the lowest position of the piston of the hydraulic cylinder through rotating the driving motor, the pressure in the gas tank is increased to the preset pressure corresponding to the highest pressure in the device at the moment, the driving motor is continuously rotated to rotate the cam for a circle, and whether the pressure circulation meets the requirement or not is checked;
s2, setting the test time, the rotating speed of the driving motor and the sampling frequency of the counter according to the test cycle requirement;
s3, during testing, closing the ball valve of the pressure gauge, starting the rotating speed of the motor from the lowest rotating speed, gradually increasing the rotating speed to the highest rotating speed after starting, and opening the ball valve of the pressure gauge at intervals during the testing to observe the pressure circulation condition in the system.
Due to the adoption of the technical scheme, the invention has the following advantages:
① the invention adopts a motor to drag pressure circulation, the driving motor is a stepless speed-regulating speed-reducing motor, the speed-regulating range of the stepless speed-regulating speed-reducing motor is 200-.
② the invention adopts gas compression to complete energy conversion, the conversion speed is fast, the adjustment is convenient, the upper end of the gas tank is welded with a screw thread accessory matched with the M8 inflation one-way valve, the conversion of internal energy and kinetic energy is generated in the system by compressing the gas in the gas tank, thereby generating pressure circulation, and the pressure change is adjusted by adjusting the proportion of oil and air in the gas tank.
③ the invention adopts Hall sensing counter whose count has memory function, and can be started and stopped at any time to continue experiment in the test process.
Drawings
FIG. 1 is a schematic illustration of the structure of the present invention.
Description of the labeling:
in fig. 1: 1-a counter; 2-a hydraulic cylinder; 3-a magnet; 4-a cam; 5-driving a motor; 6-a first tubing; 7-a gas tank; 8-an inflation one-way valve; 9-a pressure gauge; 10-a second tubing; 11-a test piece; 12-a support frame.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Specifically, the invention provides a pipe joint pressure-resistant fatigue test device which comprises a support frame 12, a pressure generating device, a pressure transmitting device, a pressure conversion device and a counting detection device, wherein the pressure generating device, the pressure transmitting device, the pressure conversion device and the counting detection device are respectively arranged on the support frame 12.
The pressure generating device comprises a cam 4, a driving motor 5 and a hydraulic cylinder 2, wherein an output shaft of the driving motor 5 is connected with the cam 4, and the driving motor 5 drives a piston rod of the hydraulic cylinder 2 to move up and down by means of the cam 4 so as to form circulating pressure in a pipeline.
Preferably, the cam is a circular eccentric cam, and the inner hole of the cam is eccentric by 4 mm.
Preferably, the driving motor is a stepless speed regulation speed reduction motor, the speed regulation range of the stepless speed regulation speed reduction motor is 200-1000r/min, and the inner diameter of the hydraulic cylinder is 32 mm. The hydraulic cylinder 2 is a rear flange single-rod piston hydraulic cylinder.
The pressure transmission device comprises a first oil pipe 6 and a second oil pipe 10, the first oil pipe 6 is connected with a rod cavity oil port of the hydraulic cylinder 2, the second oil pipe 10 is connected with a rodless cavity oil port of the hydraulic cylinder, the second oil pipe 10 is connected with a first end part of a first tee pipe joint 13, a second end part of the first tee pipe joint 13 is connected with the pressure conversion device, and a third end of the first tee pipe joint is connected with the test piece 11.
The rod cavity of the hydraulic cylinder is not stressed, the first oil pipe 6 is hung up by means of a suspension device, oil is added to the height of the first oil pipe 1/3, and the first oil pipe 6 only plays a role in loading an oil tank and lubricating a piston.
The rodless cavity of pneumatic cylinder is the high pressure chamber, and second oil pipe 10 also is single-deck wire hose, and gas pitcher and manometer are connected through three-way pipe coupling one end to second oil pipe 10, and the test piece is connected to one end, and the test piece can set up as required by the user, can rely on mating connectors to establish ties or parallel connection between a plurality of test pieces.
The pressure conversion device comprises an air tank 7 and an inflation one-way valve 8, wherein the air tank 7, the inflation one-way valve 8 and a third oil pipe 14 are respectively connected to one end part of a second three-way pipe joint 15.
Preferably, the gas tank 7 is formed by welding seamless steel pipes, a threaded accessory matched with the M8 inflation check valve is welded at the upper end of the gas tank, conversion between internal energy and kinetic energy is generated in the system by compressing gas in the gas tank, so that pressure circulation is generated, and pressure change is adjusted by regulating the proportion of oil liquid and air in the gas tank.
The inflation check valve 8 is a high-pressure inflation check valve 8.
The counting detection device comprises a pressure gauge 9 and a counter 1, wherein the pressure gauge 9 is installed on an oil path between the gas tank and the test piece, the counter is installed opposite to the cam, a magnet is arranged on one outer surface of the cam opposite to the counter 1, an induction joint of the counter is opposite to the magnet, and the distance between the magnet and the induction joint is larger than zero and smaller than 10 mm. The pressure is circulated once and the counter counts once every time the cam rotates one circle.
Preferably, the timer is a hall-induced counter. The counting of the Hall sensing counter has a memory function, and the test can be interrupted at any time in the test process.
Preferably, the pressure gauge 9 is controlled to start or close by means of a ball valve.
Preferably, the first oil pipe and the second oil pipe 10 are both single-layer wire hoses.
Preferably, the invention also provides a pipe joint pressure-resistant fatigue test method, which comprises the following steps:
s1, before testing, the gas volume to be reserved in the gas tank is calculated through a gas adiabatic compression equation, the inflation check valve is screwed down after oil is added to a preset position, the cam is rotated to the lowest position of the piston of the hydraulic cylinder through rotating the driving motor, the air tank is pressurized to the preset pressure corresponding to the highest pressure in the device at the moment, the driving motor is continuously rotated to rotate the cam for a circle, and whether the pressure circulation meets the requirement or not is checked.
S2, setting the test time, the rotating speed of the driving motor and the sampling frequency of the counter according to the test cycle requirement; the test time, the rotating speed of the driving motor and the sampling frequency of the counter can be set according to the requirements of a test piece to be tested or a user, and different test times, different rotating speeds of the driving motor and different sampling frequencies of the counter can be set according to different requirements.
S3, during the test, the ball valve of the pressure gauge is closed, the rotating speed of the motor starts from the lowest rotating speed, the rotating speed is gradually increased to the highest rotating speed after the motor is started, and the lowest rotating speed and the highest rotating speed are determined according to the rotating speed set in the step S2. During the test, a pressure meter ball valve is opened at intervals to observe the pressure circulation condition in the system, and the interval time is also set according to the requirement of a user, generally 2-5 h.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The invention provides a pipe joint pressure-resistant fatigue test device which comprises a support frame 12, a pressure generating device, a pressure transmitting device, a pressure converting device and a counting detection device, wherein the pressure generating device, the pressure transmitting device, the pressure converting device and the counting detection device are respectively arranged on the support frame 12.
In the schematic diagram of the pipe joint pressure-resistant fatigue test device shown in fig. 1, the support frame 12 is an experimental operating platform designed by 4040 thickened aluminum profiles according to the installation positions of the devices, and can be designed as required.
The pressure generating device comprises a set of 0.37KW stepless speed regulating reducing motor 5, an eccentric cam 4 and a 32mm inner diameter rear flange single-rod piston hydraulic cylinder 2, the eccentric cam is eccentric by 4mm, so that the hydraulic cylinder can obtain 8mm working stroke, and the volume of the compressed gas in the gas cylinder is obtained by multiplying the area of a high-pressure cavity of the hydraulic cylinder by the working stroke.
The pressure transmission device comprises a first oil pipe 6 and a second oil pipe 10 which are connected to an oil inlet and an oil outlet of a hydraulic cylinder, wherein the first oil pipe 6 and the second oil pipe 10 are provided with oil pipe accessories, the oil pipes are single-layer steel wire hoses of DN10, the second oil pipe 10 is connected with a test piece, an air tank and a pressure gauge through two tee pipe joints, in the embodiment, the number of the test pieces is 5, the 5 test pieces are connected in series, and in other embodiments, the number of the test pieces can be selected according to needs and then connected in series or in parallel.
The pressure conversion device comprises a pressure-resistant gas tank 7 with definite internal volume and a high-pressure one-way inflation valve 8, wherein the gas tank is formed by welding precise seamless steel tubes with the inner diameter of 15mm and the outer diameter of 20mm, and the inflation one-way valve is a 8mm quick inflation male head which is common in the market.
When the air is inflated, the high-pressure inflator is used for inflating, the test pressure is completely obtained according to the proportion of oil and gas in the air tank and a gas adiabatic compression equation, and the inflation check valve 8 is opened to fill oil and drain oil when the proportion of the oil and the gas is adjusted; the counting detection device comprises a 6-bit counting Hall sensing electronic counter 1 and a 1.6MPa pressure gauge 9, wherein the counting sampling frequency of the Hall sensing counter is set according to the rotating speed of a motor, the range of the pressure gauge is larger than the maximum test pressure, and a ball valve is needed to control the opening and closing of the pressure gauge, so that the pressure gauge is prevented from being damaged.
The detection process of the present invention is described below with reference to examples:
before starting the experiment, the device is debugged according to the test requirements.
In this case, the sealing condition of the test piece is required to be detected for 36 ten thousand times under the pressure cycle of 0.2-0.8 MPa. Therefore, the gas volume to be reserved in the gas tank is obtained by a gas adiabatic compression equation before the experiment.
The specific algorithm is as follows:
V1-V2＝ΔV
wherein, in the two formulas, P1,V1；P2,V2Respectively the air pressure and the air volume before and after compression in the air tank; n is a gas isentropic index, and the gas isentropic index of the air is 1.4; Δ V is the volume difference before and after the gas in the gas tank is compressed, i.e., the volume cyclic variation in the stroke of the hydraulic cylinder.
When oil is added to a preset position, the inflation check valve 8 is screwed down, the cam can be rotated to the lowest position of the piston of the hydraulic cylinder by rotating the motor fan, the pressure in the air cylinder is increased to 0.8MPa corresponding to the highest pressure in the device, the fan is continuously rotated to enable the motor cam to rotate for a circle to check whether the pressure circulation meets the requirement, and then corresponding adjustment is carried out.
In this embodiment, for 36 ten thousand cycles, the test is expected to be completed in about 10 hours, so the motor speed is 600r/min, and the sampling frequency of the corresponding counter is set to be greater than 10 HZ.
During the test, the ball valve of the pressure gauge is closed, the rotating speed of the motor starts from the lowest 200r/min, and the rotating speed is gradually increased to 600r/min after the motor is started. Because the counter has a memory function, the test can be stopped at any time during the test, and the pressure ball valve of the pressure gauge can be opened every two hours to observe the pressure circulation condition in the device.
In the process of implementing the experiment, five test pieces are connected in series and sealed by a copper gasket according to the experiment requirement, oil is added at a position 6cm away from the top end of the gas tank, the oil filling is adjusted by a rotating motor fan, the experiment device slightly vibrates due to a cam in the experiment, the experiment device stops working after running for 4 hours to detect the pressure, the highest pressure is reduced by 0.03MPa, the situation that the roughness of a prototype can cause slight leakage, gas heat insulation compression temperature rise and micro bulging of the test pieces under the impact of circulating pressure is considered, the highest pressure in the gas tank is slightly higher than 0.8MPa by using an air cylinder to continue the experiment, the pressure is detected once per hour until the experiment is finished, if the gas tank seriously heats in the experiment process, the experiment can be suspended, and the experiment can be continued after the heat of the gas tank is radiated or the.
Due to the adoption of the technical scheme, the invention has the following advantages:
① the invention adopts a motor to drag pressure circulation, the driving motor is a stepless speed-regulating speed-reducing motor, the speed-regulating range of the stepless speed-regulating speed-reducing motor is 200-.
② the invention adopts gas compression to complete energy conversion, the conversion speed is fast, the adjustment is convenient, the upper end of the gas tank is welded with a screw thread accessory matched with the M8 inflation one-way valve, the conversion of internal energy and kinetic energy is generated in the system by compressing the gas in the gas tank, thereby generating pressure circulation, and the pressure change is adjusted by adjusting the proportion of oil and air in the gas tank.
③ the invention adopts Hall sensing counter whose count has memory function, and can be started and stopped at any time to continue experiment in the test process.
Finally, it should be noted that: the above-mentioned embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. The utility model provides a pressure-resistant fatigue test device of coupling which characterized in that: comprises a supporting frame, a pressure generating device, a pressure transmitting device, a pressure conversion device and a counting detection device, wherein the pressure generating device, the pressure transmitting device, the pressure conversion device and the counting detection device are respectively arranged on the supporting frame,
the pressure generating device comprises a cam, a driving motor and a hydraulic cylinder, an output shaft of the driving motor is connected with the cam, the driving motor drives a piston rod of the hydraulic cylinder to move up and down by means of the cam so as to form circulating pressure in the pipeline,
the pressure transmission device comprises a first oil pipe and a second oil pipe, the first oil pipe is connected with a rod cavity oil port of the hydraulic cylinder, the second oil pipe is connected with a rodless cavity oil port of the hydraulic cylinder, the second oil pipe is connected with a first end part of a first tee pipe joint, a second end part of the first tee pipe joint is connected with the pressure conversion device by means of a third oil pipe, a third end of the first tee pipe joint is connected with the test piece,
the pressure conversion device comprises an air tank and an inflation one-way valve, the inflation one-way valve is connected to the first end part of the air tank, the second end part of the air tank and a third oil pipe are respectively connected to the two end parts of a second three-way pipe joint,
the counting detection device comprises a pressure gauge and a counter, the pressure gauge is arranged at the residual end part of a second pipe joint on an oil path between the gas tank and the test piece, the counter is arranged opposite to the cam, a magnet is arranged on the outer surface of the cam opposite to the counter, an induction joint of the counter is arranged opposite to the magnet, and the distance between the magnet and the induction joint is larger than zero and smaller than 10 mm;
the method for testing by using the pipe joint pressure-resistant fatigue testing device comprises the following steps:
s1, before testing, the gas volume to be reserved in the gas tank is calculated through a gas adiabatic compression equation, the inflation check valve is screwed down after oil is added to a preset position, the cam is rotated to the lowest position of the piston of the hydraulic cylinder through rotating the driving motor, the pressure in the gas tank is increased to the preset pressure corresponding to the highest pressure in the device at the moment, the driving motor is continuously rotated to rotate the cam for a circle, and whether the pressure circulation meets the requirement or not is checked;
s2, setting the test time, the rotating speed of the driving motor and the sampling frequency of the counter according to the test cycle requirement;
s3, during testing, closing the ball valve of the pressure gauge, starting the rotating speed of the motor from the lowest rotating speed, gradually increasing the rotating speed to the highest rotating speed after starting, opening the ball valve of the pressure gauge at intervals during the testing period to observe the pressure circulation condition in the system, and compensating the pressure by using the high-pressure air cylinder when the highest pressure is reduced.
2. The pipe joint pressure resistance fatigue test device according to claim 1, characterized in that: the pressure gauge is controlled to start or close by a ball valve.
3. The pipe joint pressure resistance fatigue test device according to claim 1, characterized in that: the cam is circular, and the inner hole of the cam is eccentric by 4 mm.
4. The pipe joint pressure resistance fatigue test device according to claim 1, characterized in that: the driving motor is a stepless speed regulation speed reduction motor, the speed regulation range of the stepless speed regulation speed reduction motor is 200-1000r/min, and the inner diameter of the hydraulic cylinder is 32 mm.
5. The pipe joint pressure resistance fatigue test device according to claim 1, characterized in that: the first oil pipe and the second oil pipe are both single-layer steel wire hoses.
6. The pipe joint pressure resistance fatigue test device according to claim 1, characterized in that: the gas pitcher is formed by seamless steel pipe welding, the upper end welding of gas pitcher has the screw thread subassembly that aerifys the check valve and match with M8, through the gaseous conversion that produces interior energy and the kinetic energy of messenger's system in the compressed gas jar to produce pressure cycle, pressure variation adjusts through the proportion of fluid and air in the regulation and control gas pitcher.
7. The pipe joint pressure resistance fatigue test device according to claim 1, characterized in that: the counter is a Hall sensing counter.
8. The pipe joint pressure resistance fatigue test device according to claim 1, characterized in that: the first oil pipe is suspended by a suspension device, and the height of the added oil is 1/3 of the height of the first oil pipe.
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| CN114509345A (en) * | 2021-12-31 | 2022-05-17 | 中国航空工业集团公司西安飞机设计研究所 | Hydraulic pipe joint connecting piece connection strength test device and test method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104174703A (en) * | 2014-07-09 | 2014-12-03 | 燕山大学 | Device for online detection of medium plate flatness |
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| GB515327A (en) * | 1938-06-16 | 1939-12-01 | British Non Ferrous Metals Res | Improved method of and apparatus for testing the strength and ductility of thin foils |
| CN101672747B (en) * | 2009-10-15 | 2011-04-20 | 徐州天地重型机械制造有限公司 | Hydraulic hose performance test experiment table |
| CN201583462U (en) * | 2010-01-19 | 2010-09-15 | 沈阳斯林达安科新技术有限公司 | Fatigue testing machine |
| CN203798681U (en) * | 2014-04-15 | 2014-08-27 | 北京国彬信诚科技有限公司 | Hydraulic pipe strength test system |
| CN106226053A (en) * | 2016-07-28 | 2016-12-14 | 天津市神驰汽车零部件有限公司 | A kind of acoustic filter compressive resistance and intrinsic pressure durable test stand and test method |
| CN107957315A (en) * | 2018-01-09 | 2018-04-24 | 上海仪器仪表自控系统检验测试所有限公司 | A kind of pressure-resistant fatigue experimental device of pressure gauge |
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| CN104174703A (en) * | 2014-07-09 | 2014-12-03 | 燕山大学 | Device for online detection of medium plate flatness |
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