CN112857975A - Hose bending fatigue testing machine - Google Patents
Hose bending fatigue testing machine Download PDFInfo
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- CN112857975A CN112857975A CN202110161219.XA CN202110161219A CN112857975A CN 112857975 A CN112857975 A CN 112857975A CN 202110161219 A CN202110161219 A CN 202110161219A CN 112857975 A CN112857975 A CN 112857975A
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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
- G01N3/02—Details
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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
- G01N3/02—Details
- G01N3/04—Chucks
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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
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
- G01N3/36—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by pneumatic or hydraulic means
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Abstract
The invention discloses a hose bending fatigue testing machine, which comprises a test piece fixing device and a pressurized liquid circulation system, wherein the test piece fixing device is arranged on the test piece fixing device; the hose bending fatigue testing machine utilizes the synchronous motion of the servo motor and the servo loading cylinder, realizes infinite fatigue cycle times through automatic control, and simulates the use limit of a flexible hose when the flexible hose receives bending load in the use environment of heating and pressurizing applied to the petroleum industry; the service life of the composite material hose under the service condition can not be predicted by quickly testing the engineering.
Description
Technical Field
The invention relates to the field of hose bending fatigue tests, in particular to a hose bending fatigue testing machine.
Background
In the fields of petrochemical industry, natural gas transportation and the like in China and all over the world, the requirements on the demand and various characteristics of composite material hoses are increasing sharply, and the petrochemical industry composite hose is still good in fracture resistance and leakage resistance and cannot burst suddenly in a severe environment due to a multi-material multi-layer sealing structure, can easily handle the transmission work of gasoline, diesel oil and various chemical liquids, and can still keep high flexibility even in cold weather. The flexible static electricity dissipation pipe is light in weight, strong in toughness, easy to carry, flexible in use, high-temperature resistant, low-temperature resistant, ageing resistant, non-deformable, corrosion resistant and reliable in static electricity dissipation performance. However, the composite material hose cannot be bent or fatigued due to various external factors, installation terrains and other factors in the long-term use process, the flexibility of the composite material hose is impacted in a heating and pressurizing environment, the aging of the hose body is accelerated, the service life of the composite material hose under the use condition cannot be predicted in engineering, and the hose body is suddenly broken due to the fact that the composite material hose is not replaced in time in the use process, so that media in the hose are leaked, and unnecessary losses are caused to the environment and lives and properties.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art, and provides a hose bending fatigue testing machine which can accurately complete fatigue circulation by simulating a using medium environment for a fatigue test of a composite hose.
The technical problem to be solved by the invention is realized by the following technical scheme, and the invention provides a hose bending fatigue testing machine, which comprises a test piece fixing device and a pressurized liquid circulation system; the test piece fixing device clamps and fixes the test piece, and the test piece fixing device is matched with each part to complete fatigue cycle motion; the pressurized liquid circulation system completes the medium environment of temperature and pressure in the simulation test, so that the test data is more real and accurate.
The test piece fixing device comprises a horizontally placed base, a supporting frame is vertically arranged on one side of the base, a first fulcrum is arranged at the top end of the supporting frame, a fixed base and a movable base are oppositely arranged on the base, and the movable base moves towards the fixed base along the length direction of the base; a fixed end clamp is hinged to the top of the fixed base, a second fulcrum is arranged at the outer end of the fixed end clamp, and a servo loading cylinder for driving the fixed end clamp to move up and down around the hinged shaft is arranged between the second fulcrum and the first fulcrum; the servo loading cylinder generates reciprocating circular motion when working, and the fatigue circular motion of the test is synchronously completed by matching with the movable base. The top of the movable base is hinged with a movable end clamp which is at the same height as the fixed end clamp, and a test piece is clamped between the fixed end clamp and the movable end clamp; the test piece completes the fatigue motion of compression and rebound between the movable base and the fixed base.
The pressurized liquid circulating system comprises a liquid storage tank, a pressurized outlet and a circulating inlet are arranged at the lower part of the liquid storage tank, the pressurized outlet is connected with the fixed end clamp through a pressurized pipe, the circulating inlet is connected with the movable end clamp through a circulating pipeline, and a pressurized circulating pump is arranged on the pressurized pipe; the pressurization circulating pump provides continuous power, makes the liquid that is heated in the liquid storage tank constantly recycle, when practicing thrift liquid, guarantees that liquid is in the constant temperature state at whole circulation in-process, can not cause experimental interrupt or cause the deviation to test data because of the change of temperature or be heated inhomogeneously in the experiment.
The liquid reserve tank preheats, reaches experimental simulation temperature, carries out the centre gripping with the test piece both ends respectively with stiff end anchor clamps and expansion end anchor clamps simultaneously and guarantees sealedly, and liquid can not be because of revealing the loss in entire system, guarantees the total amount of liquid, and the temperature can not rise because of liquid loss simultaneously, causes experimental temperature's deviation. The pressurizing circulating pump starts to work, heated liquid in the liquid storage tank enters a test piece to circularly flow under the driving of the pressurizing circulating pump, the movable base is driven to slide towards the fixed base, the test piece is compressed from two ends to the middle, the servo loading cylinder does extension movement at the same time, a second fulcrum corresponding to the fixed end clamp is driven to move downwards, the middle of the test piece is bent upwards, when the movable base reaches the minimum limit position, the movable base rebounds to the initial position, and the test piece is restored to a free state; driving the movable base to slide towards the fixed base again, compressing the test piece from two ends to the middle, simultaneously making retraction movement by the servo loading cylinder, driving a second fulcrum corresponding to the fixed end clamp to move upwards, bending the middle of the test piece downwards, when the movable base reaches a limit minimum position, rebounding the movable base to an initial position, and restoring the test piece to a free state; the servo loading cylinder and the movable base move simultaneously to complete the circular reciprocating motion of the infinite test piece bending. In a circulating motion, the test piece not only completes the upward bending motion, but also completes the downward bending motion, and the limit motion track is simulated.
The technical problem to be solved by the invention can be further realized by the following technical scheme that a rectangular sliding seat is arranged below the movable base, a servo motor is arranged on the sliding seat, a guide rail is arranged on the base and is in sliding fit with the sliding seat, two rows of pulleys are symmetrically arranged on two sides of the sliding seat along the direction of the guide rail, each row is provided with a plurality of pulleys, and one side of the guide rail, which is far away from the fixed end, is provided with a limit baffle. The two rows of pulleys transversely limit the sliding seat, the pulleys roll along the guide rail, the friction force is small, and the power required during sliding is small; the servo motor provides a timing and quantitative pulse power for the sliding seat, and the force supply circular motion with the same frequency is ensured. The limiting baffle plate limits the maximum limit position of the sliding support, and the sliding seat is guaranteed not to be separated from the guide rail.
The technical problem to be solved by the invention can be further solved by adopting the following technical scheme that the fixed end clamp comprises a first pipe joint support and a second pipe joint support which are symmetrically arranged, bolt holes are correspondingly arranged at the upper end and the lower end of each of the first pipe joint support and the second pipe joint support, the first pipe joint support and the second pipe joint support are fastened through stud nuts, and a flexible shaft sleeve assembly is clamped between the first pipe joint support and the second pipe joint support. According to the diameter of the flexible shaft sleeve assembly, the clamping distance between the first pipe joint support and the second pipe joint support is adjusted, and the fixation of the flexible shaft sleeve assemblies of all specifications is met. The flexible shaft sleeve assembly comprises a sleeve flange assembly and a mandrel flange assembly, the mandrel flange assembly is sleeved into the sleeve flange assembly in the same direction, the sleeve flange assembly comprises a sleeve flange and a flexible outer sleeve, the mandrel flange assembly comprises a mandrel flange and a fixed end flexible inner sleeve, the sleeve flange and the mandrel flange are matched and fastened through bolts and nuts, the free end of the fixed end flexible inner sleeve is provided with a first flat cover, two pressurizing interfaces are arranged on the first flat cover, and a connecting plate is arranged outside the first flat cover. The connecting plate indirectly drives the fixed end clamp to synchronously move.
The technical problem to be solved by the invention can be further solved by adopting the following technical scheme that the movable end clamp comprises a first pipe joint support and a second pipe joint support which are symmetrically arranged, bolt holes are correspondingly arranged at the upper end and the lower end of each of the first pipe joint support and the second pipe joint support, the first pipe joint support and the second pipe joint support are fastened through stud nuts, and a flexible shaft sleeve assembly is clamped between the first pipe joint support and the second pipe joint support; according to the diameter of the flexible shaft sleeve assembly, the clamping distance between the first pipe joint support and the second pipe joint support is adjusted, and the fixation of the flexible shaft sleeve assemblies of all specifications is met. The flexible shaft sleeve assembly comprises a sleeve flange assembly and a mandrel flange assembly, the mandrel flange assembly is sleeved into the sleeve flange assembly in the same direction, the sleeve flange assembly comprises a sleeve flange and a flexible outer sleeve, the mandrel flange assembly comprises a mandrel flange and a fixed-end flexible inner sleeve, the sleeve flange and the mandrel flange are matched and fastened through bolts and nuts, the free end of the movable-end flexible inner sleeve is provided with a second flat cover, and two circulating liquid connectors are arranged on the second flat cover.
The technical problem to be solved by the invention can be further realized by the following technical scheme that the inner wall of the flexible outer sleeve is in a conical shape, the inner diameter of the flexible outer sleeve gradually increases from one end of the connection test piece to the flange end of the sleeve, the outer wall of the flexible inner sleeve is in a conical shape, the inner diameter of the flexible inner sleeve gradually increases from one end of the connection test piece to the flange end of the axis, and the flexible inner sleeve and the flexible outer sleeve are in corresponding clearance fit in shape and size. The flexible inner sleeve and the flexible outer sleeve are fastened through the matching of the sleeve flange and the mandrel flange through a conical structure. The self-tightening sealing function is achieved, so that the test piece is clamped more firmly, and the sealing performance of the internal environment of the test piece is ensured.
The technical problem to be solved by the invention can be further realized by the following technical scheme that an electric heating pipe and a temperature sensor are arranged in the liquid storage tank, a liquid inlet is formed in the side wall of the upper part of the liquid storage tank, a pressurization outlet and a circulation inlet are formed in the position, opposite to the liquid inlet, of the lower part of the liquid storage tank, a water outlet is formed in the bottom of the liquid storage tank, and a heat insulation layer is arranged on the outer side of the liquid storage tank. The heating rhythm of the electric heating pipe is adjusted by the feedback data of the temperature sensor, and the constant temperature state is kept in the whole experiment process; the heat preservation layer effectively prevents the loss of heat.
The technical problem to be solved by the invention can be further realized by the following technical scheme that the maximum distance between the fixed base and the movable base is 4m, and the minimum distance between the fixed base and the movable base is 2.4 m. The test pieces with different specifications are different from the test pieces in working conditions, and the movable base is limited to move in an interval of 2.4-4 m away from the fixed base.
The technical problem to be solved by the invention can be further realized by the following technical scheme that the servo loading cylinder comprises a motor and a cylinder barrel, a screw rod is arranged in the cylinder barrel, a rotating shaft of the motor is in matched transmission with the screw rod through a turbine, the free end of the cylinder barrel is hinged with the first supporting point, and the free end of the screw rod is hinged with the connecting plate. The servo loading cylinder is controlled by a system, the servo motor rotates by an angle and can send out pulses with corresponding quantity, the system automatically identifies the quantity and time of the sent pulses and can accurately control the rotation of the motor, so that accurate positioning is realized, and the servo loading cylinder provides a pulsating loading force for a fixed end clamp of a test piece to enable the test piece to move according to a preset track.
The technical problem to be solved by the invention can be further solved by the following technical scheme that the pressure of the pressurization circulating pump does not exceed 10 Mpa.
When the test is started, one end of a test piece is sleeved outside the flexible inner sleeve, the flexible inner sleeve sleeved with the pipe orifice of the test piece penetrates into the flexible outer sleeve in the same direction, and the mandrel flange and the sleeve flange are sealed in a matched mode and fastened through bolts and nuts; the flexible shaft sleeve assembly of the test piece end is clamped and assembled between the first pipe joint support and the second pipe joint support, and the first pipe joint support and the second pipe joint support are fastened through stud nuts. After one end of a test piece is arranged on a fixed end clamp, the mandrel flange component is sleeved into the sleeve flange component in the same direction, the other end of the test piece is sleeved into a gap between the flexible inner sleeve and the flexible outer sleeve, and the mandrel flange and the sleeve flange are matched and sealed and fastened by bolts and nuts when the end head of the test piece reaches the tail end of the flexible outer sleeve; the flexible shaft sleeve assembly of the test piece end is clamped and assembled between the first pipe joint support and the second pipe joint support, and the first pipe joint support and the second pipe joint support are fastened through stud nuts. Then the movable end clamp is arranged on the movable base, and the fixed end clamp is arranged on the fixed base. The test piece is a flexible pipe fitting, and the outer surface of the flexible pipe fitting is provided with a whole circle of hose heat-insulating layer. Two pressurizing interfaces on a first flat cover of the fixed end flexible inner sleeve are connected with a pressurizing pipe, and a connecting plate is arranged outside the first flat cover and hinged with the free end of a screw rod of the servo loading cylinder. Two circulating liquid interfaces on the second flat cover of the flexible inner sleeve at the movable end are connected with a circulating pipeline. Before the test begins, liquid is injected into the liquid storage tank through the liquid inlet, the electric heating pipe begins to heat, the liquid storage tank is preheated to reach the test simulation temperature, and after the temperature sensor transmits data feedback, the heating time and the heating temperature of the electric heating pipe are adjusted to ensure the temperature constancy of the heating liquid. And (4) opening the pressurizing circulating pump, and allowing heated liquid in the liquid storage tank to enter the test piece to circularly flow under the driving of the pressurizing circulating pump. Then, the servo loading cylinder operates while a servo motor is started, the servo motor drives the sliding seat to move towards the direction of the fixed base on the guide rail through the pulley, a screw rod of the servo loading cylinder makes extension movement, and the test piece finishes the action of bending upwards; when the movable base slides to a position 2.4m away from the fixed base, the screw rod simultaneously reaches the lowest position of the limit, and the sliding seat rebounds along the guide rail. When the movable base returns to the initial position, the servo loading cylinder starts to work, the screw rod retracts most, meanwhile, the servo motor pulses again to give force, the movable base moves towards the fixed base again, the test piece finishes downward bending, when the movable base slides to a position 2.4m away from the fixed base, the screw rod simultaneously reaches the highest limit position, and the sliding base rebounds along the guide rail; the test piece does fatigue limit movement by the reciprocating circulation.
The invention has the beneficial effects that: the hose bending fatigue testing machine comprises a test piece fixing device and a pressurized liquid circulating system; the hose bending fatigue testing machine utilizes the synchronous motion of the servo motor and the servo loading cylinder, realizes infinite fatigue cycle times through automatic control, and simulates the use limit of a flexible hose when the flexible hose receives bending load in the use environment of heating and pressurizing applied to the petroleum industry; the service life of the composite material hose under the service condition can not be predicted by quickly testing the engineering.
Drawings
FIG. 1 is a schematic view of the overall structure of a hose bending fatigue testing machine;
FIG. 2 is a schematic view of a fixing base of the hose bending fatigue testing machine;
FIG. 3 is a schematic structural view of a movable base of the hose bending fatigue testing machine;
FIG. 4 is a schematic structural view of a fixed end clamp of the hose bending fatigue testing machine;
FIG. 5 is a schematic structural view of a movable end clamp of the hose bending fatigue testing machine;
FIG. 6 is a schematic view of a sleeve flange assembly of the hose bending fatigue tester;
FIG. 7 is a schematic view of a mandrel flange assembly of the hose bending fatigue tester.
The technical solutions in the embodiments of the present invention will be 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.
Referring to fig. 1-7, the present invention provides a technical solution: a hose bending fatigue testing machine is shown in figure 1 and comprises a test piece fixing device and a pressurized liquid circulation system;
the test piece fixing device comprises a horizontally placed base 2, a supporting frame 6 is vertically arranged on one side of the base 2, a first fulcrum 4-1 is arranged at the top end of the supporting frame 6, a fixed base 3 and a movable base 1 which are oppositely arranged are arranged on the base 2, and the movable base 1 moves towards the fixed base 3 along the length direction of the base 2; a fixed end clamp 8 is hinged to the top of the fixed base 3, a second fulcrum 1 is arranged at the outer end of the fixed end clamp 8, and a servo loading cylinder 7 for driving the fixed end clamp 8 to move up and down around a hinged shaft is arranged between the second fulcrum 1 and the first fulcrum 4-1; the servo loading cylinder 7 comprises a motor 1 and a cylinder barrel 1, a screw rod 7-2 is arranged in the cylinder barrel 1, a rotating shaft of the motor 1 is in matched transmission with the screw rod 7-2 through a turbine, test preparation is finished, when a test is started, the servo loading cylinder 7 starts to work, the motor starts to work, the rotating shaft of the motor rotates in the positive direction, the rotating shaft drives the screw rod 7-2 to do extension movement, the free end of the cylinder barrel 1 is hinged to a first supporting point 4-1, and the free end of the screw rod 7-2 is hinged to a connecting plate 3-1. The screw 7-2 drives the free end of the fixed end clamp 8 to press downwards through the connecting plate 1, when the free end reaches the limit of the lowest position of the stroke, the rotating shaft of the motor rotates reversely, the rotating shaft drives the screw 7-2 to do retraction movement, the screw 7-2 drives the free end of the fixed end clamp 8 to move upwards through the connecting plate 1 until the free end reaches the limit of the highest position of the stroke, and the reciprocating telescopic movement is performed in this way.
The top of the movable base 1 is hinged with a movable end clamp 10 which is at the same height as the fixed end clamp 8, and a test piece 9 is clamped between the fixed end clamp 8 and the movable end clamp 10; the maximum distance between the fixed base 3 and the movable base 1 is 4m, and the minimum distance between the fixed base 3 and the movable base 1 is 2.4 m. The free state distance between the fixed end clamp 8 and the movable end clamp 10 is 4m, the fixed end clamp 8 and the movable end clamp 10 clamp the test piece 9, a rectangular sliding seat 1-2 is arranged below the movable base 1, a servo motor 1-4 is arranged on the sliding seat 1-2, the servo motor 1-4 starts to work when the servo loading cylinder 7 starts to work, the base 2 is provided with a guide rail 1-1, the guide rail 1-1 is in sliding fit with the sliding seat 1-2, two rows of pulleys 1-3 are symmetrically arranged on two sides of the sliding seat 1-2 along the direction of the guide rail 1-1, each row is provided with a plurality of pulleys 1-3, the servo motor 1-4 drives the sliding seat 1-2 to move towards the direction of the fixed base 3 on the guide rail 1-1 through the pulleys 1-3, and the test piece 9 finishes the action of bending upwards; when the movable base 1 slides to a position 32.4m away from the fixed base, the screw rod 7-2 simultaneously reaches the lowest position of the limit, and the sliding seat 1-2 rebounds along the guide rail; when the movable base 1 reaches the initial position, the servo loading cylinder 7 starts to work, the screw rod 7-2 moves in the most retracted mode, meanwhile, the servo motor gives force in a pulsating mode again, the movable base 1 moves towards the fixed base 3 again, and the test piece 9 finishes downward bending. When the movable base 1 slides to a position 2.4m away from the fixed base 3, the screw rod 7-2 simultaneously reaches the highest position of the limit, and the sliding seat 1-2 rebounds along the guide rail 1-1; the test piece does fatigue limit motion by the reciprocating circular motion. And when the guide rail 1-1 is far away from the fixed end 1, one side of the guide rail 1-1 is provided with a limit baffle 2-1.
The pressurized liquid circulating system comprises a liquid storage tank 5, and a heat preservation layer 5-3 is arranged on the outer side of the liquid storage tank 5. An electric heating pipe 5-1 and a temperature sensor 5-2 are arranged in the liquid storage tank 5, when the liquid storage tank 5 is preheated to reach the test simulation temperature, and the temperature sensor 5-2 transmits data feedback, the heating time and temperature of the electric heating pipe 5-1 are adjusted to ensure the constant temperature of the heated liquid. The side wall of the upper part of the liquid storage tank 5 is provided with a liquid inlet 5-4, a pressurizing outlet 5-6 and a circulating inlet 5-7 are arranged at the lower part of the liquid storage tank 5 and opposite to the liquid inlet 5-4, a water outlet 1 is arranged at the bottom of the liquid storage tank 5, liquid is injected into the liquid storage tank 5 through the liquid inlet 5-4 before the liquid storage tank 5 is used, and liquid medium is discharged through the water outlet 5-5 after the liquid storage tank 5 is used or when the liquid storage tank 5 needs to be cleaned. The lower part of the liquid storage tank is provided with a pressurization outlet 5-6 and a circulation inlet 5-7, the pressurization outlet 5-6 is connected with a fixed end clamp 8 through a pressurization pipe 4-1, the circulation inlet 5-7 is connected with a movable end clamp 10 through a circulation pipeline 4-2, and the pressurization circulation pump 4 is arranged on the pressurization pipe 4-1; the pressure of the pressurizing circulating pump 4 is not more than 10 Mpa. The two ends of the test piece 9 are respectively clamped with the fixed end clamp 8 and the movable end clamp 10 and sealed. The pressurization circulating pump 4 begins to work, and the liquid that is heated in the liquid reserve tank 5 gets into test piece 9 circulation flow under the drive of pressurization circulating pump 4, and test piece 9 is flexible pipe fitting, and flexible pipe fitting surface is equipped with the hose heat preservation that the whole circle of material is PE foaming hose. Under the simulated medium environment of constant temperature and constant pressure, the movable base 1 slides to the fixed base 3, the servo loading cylinder 7 makes extension movement, the middle of the test piece 9 bends upwards, when the movable base 1 reaches the minimum limit position, the movable base 1 rebounds to the initial position, and the test piece 9 returns to the free state; the movable base 1 is driven to slide towards the fixed base 3 again, meanwhile, the servo loading cylinder 7 makes retraction movement, the middle of the test piece 9 bends downwards, when the movable base 1 reaches the minimum limit position, the movable base 1 rebounds to the initial position, and the test piece 9 is restored to the free state; in the whole experiment process, heated liquid continuously enters the flexible pipe fitting 1 from the pressurizing pipe 4-1 through the pressurizing circulating pump 4 and then flows back into the liquid storage tank 5 through the circulating pipeline 4-2, and is heated repeatedly.
The fixed end clamp 8 comprises a first pipe joint support 11-1 and a second pipe joint support 11-2 which are symmetrically arranged, bolt holes are correspondingly arranged at the upper end and the lower end of the first pipe joint support 11-1 and the second pipe joint support 11-2, the first pipe joint support 11-1 and the second pipe joint support 11-2 are fastened through stud nuts, a flexible shaft sleeve component 12 is clamped between the first pipe joint support 11-1 and the second pipe joint support 11-2, the flexible shaft sleeve component 12 comprises a sleeve flange component 12-1 and a mandrel flange component 12-2, the mandrel flange component 12-2 is sleeved into the sleeve flange component 12-1 in the same direction, the sleeve flange component 12-1 comprises a sleeve flange 12-1-1 and a flexible outer sleeve 12-1-2, the mandrel flange component 12-2 comprises a mandrel flange 12-2-1 and a fixed end flexible inner sleeve 12-2-2, the sleeve flange 12-1-1 and the mandrel flange 12-2-1 are matched and fastened through bolts and nuts, the inner wall of the flexible outer sleeve 12-1-2 is in a conical shape, the inner diameter of the flexible inner sleeve 12-2-2 gradually increases from one end of the connection test piece 9 to the end of the sleeve flange 12-1-1, the outer wall of the flexible inner sleeve 12-2-2 is in a conical shape, the inner diameter of the flexible inner sleeve 12-2-2 gradually increases from one end of the connection test piece 9 to the end of the mandrel flange 12-2-1, and the shape and the size of the flexible inner sleeve 12-. When the test is started, one end of a test piece 9 is firstly sleeved outside the flexible inner sleeve 12-2-2, then the flexible inner sleeve 12-2-2 sleeved with the pipe orifice of the test piece 9 penetrates into the flexible outer sleeve 12-1-2 in the same direction, and the mandrel flange 12-2-1 and the sleeve flange 12-1-1 are paired and sealed and fastened by bolts and nuts; the flexible shaft sleeve assembly 12 of the end of the test piece 9 is clamped and assembled between the first pipe joint support 11-1 and the second pipe joint support 11-2, and the first pipe joint support 11-1 and the second pipe joint support 11-2 are fastened through stud nuts. The free end of the flexible inner sleeve 12-2-2 of the fixed end is provided with a first flat cover 12-2-4, the first flat cover 12-2-4 is provided with two pressurizing connectors 12-2-3, and a connecting plate 3-1 is arranged outside the first flat cover 12-2-4.
The movable end clamp 10 comprises a first pipe joint support 11-1 and a second pipe joint support 11-2 which are symmetrically arranged, bolt holes are correspondingly formed in the upper end and the lower end of the first pipe joint support 11-1 and the upper end and the lower end of the second pipe joint support 11-2, the first pipe joint support 11-1 and the second pipe joint support 11-2 are fastened through stud nuts, a flexible shaft sleeve component 12 is clamped between the first pipe joint support 11-1 and the second pipe joint support 11-2, the flexible shaft sleeve component 12 comprises a sleeve flange component 12-1 and a mandrel flange component 12-2, the mandrel flange component 12-2 is sleeved into the sleeve flange component 12-1 in the same direction, the sleeve flange component 12-1 comprises a sleeve flange 12-1-1 and a flexible outer sleeve 12-1-2, and the mandrel flange component 12-2 comprises a mandrel flange 12-2-1 and a flexible inner fixed end The sleeve is 12-2-2, the sleeve flange 12-1-1 and the mandrel flange 12-2-1 are matched and fastened through bolts and nuts, the inner wall of the flexible outer sleeve 12-1-2 is in a conical shape, the inner diameter of the flexible inner sleeve 12-2-2 gradually increases from one end of the connection test piece 9 to the end of the sleeve flange 12-1-1, the outer wall of the flexible inner sleeve 12-2-2 is in a conical shape, the inner diameter of the flexible inner sleeve 12-2-2 gradually increases from one end of the connection test piece 9 to the end of the mandrel flange 12-2-1, and the shape and the size of the flexible outer sleeve 12. After one end of a test piece 9 is installed on a fixed end clamp 8, a mandrel flange component 12-2 is sleeved into a sleeve flange component 12-1 in the same direction, the other end of the test piece 9 is sleeved into a gap between a flexible inner sleeve 12-2-2 and a flexible outer sleeve 12-1-2, when the end of the test piece 9 reaches the tail end of the flexible outer sleeve 12-1-2, the mandrel flange 12-2-1 and the sleeve flange 12-1-1 are sealed in a matched mode and fastened through bolts and nuts; the flexible shaft sleeve assembly 12 of the end of the test piece 9 is clamped and assembled between the first pipe joint support 11-1 and the second pipe joint support 11-2, and the first pipe joint support 11-1 and the second pipe joint support 11-2 are fastened through stud nuts. The free end of the flexible inner sleeve 12-2-2 at the movable end is provided with a second flat cover 12-2-6, and the second flat cover 12-2-6 is provided with two circulating liquid connectors 12-2-5.
The hose bending fatigue testing machine comprises a test piece fixing device and a pressurized liquid circulating system; the hose bending fatigue testing machine utilizes the synchronous motion of the servo motor and the servo loading cylinder, realizes infinite fatigue cycle times through automatic control, and simulates the use limit of a flexible hose when the flexible hose receives bending load in the use environment of heating and pressurizing applied to the petroleum industry; the service life of the composite material hose under the service condition can not be predicted by quickly testing the engineering.
Claims (9)
1. The utility model provides a hose bending fatigue testing machine which characterized in that: comprises a test piece fixing device and a pressurized liquid circulating system;
the test piece fixing device comprises a horizontally placed base (2), a support frame (6) is vertically arranged on one side of the base (2), a first fulcrum (4-1) is arranged at the top end of the support frame (6), a fixed base (3) and a movable base (1) which are oppositely arranged are arranged on the base (2), and the movable base (1) moves towards the fixed base (3) along the length direction of the base (2); a fixed end clamp (8) is hinged to the top of the fixed base (3), a second fulcrum is arranged at the outer end of the fixed end clamp (8), and a servo loading cylinder (7) for driving the fixed end clamp (8) to move up and down around a hinged shaft is arranged between the second fulcrum and the first fulcrum (4-1); the top of the movable base (1) is hinged with a movable end clamp (10) which is at the same height as the fixed end clamp (8), and a test piece (9) is clamped between the fixed end clamp (8) and the movable end clamp (10);
the pressurized liquid circulating system comprises a liquid storage tank (5), a pressurized outlet (5-6) and a circulating inlet (5-7) are arranged at the lower part of the liquid storage tank (5), the pressurized outlet (5-6) is connected with a fixed end clamp (8) through a pressurized pipe (4-1), the circulating inlet (5-7) is connected with a movable end clamp (10) through a circulating pipeline (4-2), and a pressurized circulating pump (4) is arranged on the pressurized pipe (4-1);
the liquid storage tank (5) is preheated to reach a test simulation temperature, two ends of a test piece (9) are clamped with the fixed end clamp (8) and the movable end clamp (10) respectively and sealed, the pressurizing circulating pump (4) starts to work, heated liquid in the liquid storage tank (5) enters the test piece (9) to flow circularly under the driving of the pressurizing circulating pump (4), the movable base (1) is driven to slide towards the fixed base (3), the test piece (9) is compressed from two ends to the middle, meanwhile, the servo loading cylinder (7) performs extension movement to drive a second fulcrum corresponding to the fixed end clamp (8) to move downwards, the middle of the test piece (9) bends upwards, when the movable base (1) reaches a minimum limit position, the movable base (1) rebounds to an initial position, and the test piece (9) returns to a free state; the movable base (1) is driven to slide towards the fixed base (3) again, the test piece (9) is compressed from two ends to the middle, meanwhile, the servo loading cylinder (7) makes retraction movement to drive a second fulcrum corresponding to the fixed end clamp (8) to move upwards, the middle of the test piece (9) bends downwards, when the movable base (1) reaches the minimum limit position, the movable base (1) rebounds to the initial position, and the test piece (9) returns to the free state; the servo loading cylinder (7) and the movable base (1) move simultaneously to complete the infinite circular reciprocating motion of bending the test piece (9).
2. The hose bending fatigue testing machine of claim 1, wherein: the movable base is characterized in that a rectangular sliding seat (1-2) is arranged below the movable base (1), a servo motor (1-4) is arranged on the sliding seat (1-2), a guide rail (1-1) is arranged on the base (2), the guide rail (1-1) is in sliding fit with the sliding seat (1-2), two rows of pulleys (1-3) are symmetrically arranged on two sides of the sliding seat (1-2) along the direction of the guide rail (1-1), each row of pulleys is provided with a plurality of pulleys (1-3), and a limit baffle (2-1) is arranged on one side, far away from the fixed end, of the guide rail (1-1).
3. The hose bending fatigue testing machine of claim 1, wherein: the fixed end clamp (8) comprises a first pipe joint support (11-1) and a second pipe joint support (11-2) which are symmetrically arranged, bolt holes are correspondingly formed in the upper end and the lower end of the first pipe joint support (11-1) and the lower end of the second pipe joint support (11-2), the first pipe joint support (11-1) and the second pipe joint support (11-2) are fastened through stud nuts, a flexible shaft sleeve assembly (12) is clamped between the first pipe joint support (11-1) and the second pipe joint support (11-2), the flexible shaft sleeve assembly (12) comprises a sleeve flange assembly (12-1) and a mandrel flange assembly (12-2), the mandrel flange assembly (12-2) is sleeved into the sleeve flange assembly (12-1) in the same direction, and the sleeve flange assembly (12-1) comprises a sleeve flange (12-1-1) and a flexible outer sleeve (12-1) -2), the mandrel flange assembly (12-2) comprises a mandrel flange (12-2-1) and a fixed end flexible inner sleeve (12-2-2), the sleeve flange (12-1-1) and the mandrel flange (12-2-1) are matched and fastened through bolts and nuts, the free end of the fixed end flexible inner sleeve (12-2-2) is provided with a first flat cover (12-2-4), the first flat cover (12-2-4) is provided with two pressurizing interfaces (12-2-3), and a connecting plate (3-1) is arranged outside the first flat cover (12-2-4).
4. The hose bending fatigue testing machine of claim 1, wherein: the movable end clamp (10) comprises a first pipe joint support (11-1) and a second pipe joint support (11-2) which are symmetrically arranged, bolt holes are correspondingly formed in the upper end and the lower end of the first pipe joint support (11-1) and the lower end of the second pipe joint support (11-2), the first pipe joint support (11-1) and the second pipe joint support (11-2) are fastened through stud nuts, a flexible shaft sleeve assembly (12) is clamped between the first pipe joint support (11-1) and the second pipe joint support (11-2), the flexible shaft sleeve assembly (12) comprises a sleeve flange assembly (12-1) and a mandrel flange assembly (12-2), the mandrel flange assembly (12-2) is sleeved into the sleeve flange assembly (12-1) in the same direction, and the sleeve flange assembly (12-1) comprises a sleeve flange (12-1-1) and a flexible outer sleeve flange (12-1) -2), the mandrel flange assembly (12-2) comprises a mandrel flange (12-2-1) and a fixed end flexible inner sleeve (12-2-2), the sleeve flange (12-1-1) and the mandrel flange (12-2-1) are matched and fastened through bolts and nuts, a second flat cover (12-2-6) is arranged at the free end of the movable end flexible inner sleeve (12-2-2), and two circulating liquid connectors (12-2-5) are arranged on the second flat cover (12-2-6).
5. A hose bending fatigue tester according to claim 3 or 4, wherein: the inner wall of the flexible outer sleeve (12-1-2) is in a conical shape, the inner diameter of the flexible inner sleeve (12-2-2) gradually increases from one end of the connection test piece (9) to the end of the sleeve flange (12-1-1), the outer wall of the flexible inner sleeve (12-2-2) is in a conical shape, the inner diameter of the flexible inner sleeve (12-2-2) gradually increases from one end of the connection test piece (9) to the end of the mandrel flange (12-2-1), and the flexible inner sleeve (12-2-2) and the flexible outer sleeve (12-1-2).
6. The hose bending fatigue testing machine of claim 1, wherein: the improved electric heating water heater is characterized in that an electric heating pipe (5-1) and a temperature sensor (5-2) are arranged in the liquid storage tank (5), a liquid inlet (5-4) is formed in the side wall of the upper portion of the liquid storage tank (5), a pressurizing outlet (5-6) and a circulating inlet (5-7) are formed in the position, opposite to the liquid inlet (5-4), of the lower portion of the liquid storage tank (5), a water outlet (5-5) is formed in the bottom of the liquid storage tank (5), and a heat preservation layer (5-3) is arranged on the outer side of the.
7. The hose bending fatigue testing machine of claim 1, wherein: the maximum distance between the fixed base (3) and the movable base (1) is 4m, and the minimum distance between the fixed base (3) and the movable base (1) is 2.4 m.
8. The hose bending fatigue testing machine of claim 1, wherein: the servo loading cylinder (7) comprises a motor and a cylinder barrel (7-1), a screw rod (7-2) is arranged in the cylinder barrel (7-1), a rotating shaft of the motor is in matched transmission with the screw rod (7-2) through a turbine, the free end of the cylinder barrel (7-1) is hinged with a first fulcrum (4-1), and the free end of the screw rod (7-2) is hinged with a connecting plate (3-1).
9. The hose bending fatigue testing machine of claim 1, wherein: the pressure of the pressurizing circulating pump (4) is not more than 10 Mpa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110161219.XA CN112857975A (en) | 2021-02-05 | 2021-02-05 | Hose bending fatigue testing machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110161219.XA CN112857975A (en) | 2021-02-05 | 2021-02-05 | Hose bending fatigue testing machine |
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| Publication Number | Publication Date |
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| CN112857975A true CN112857975A (en) | 2021-05-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113237776A (en) * | 2021-05-31 | 2021-08-10 | 青岛中和聚氨酯材料有限公司 | Polyurethane high-temperature illumination deformation detection device and detection method thereof |
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2021
- 2021-02-05 CN CN202110161219.XA patent/CN112857975A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113237776A (en) * | 2021-05-31 | 2021-08-10 | 青岛中和聚氨酯材料有限公司 | Polyurethane high-temperature illumination deformation detection device and detection method thereof |
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