CN114486526A - Measuring instrument for detecting pressure-bearing limit value of steel pipe and using method thereof - Google Patents
Measuring instrument for detecting pressure-bearing limit value of steel pipe and using method thereof Download PDFInfo
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- CN114486526A CN114486526A CN202210094742.XA CN202210094742A CN114486526A CN 114486526 A CN114486526 A CN 114486526A CN 202210094742 A CN202210094742 A CN 202210094742A CN 114486526 A CN114486526 A CN 114486526A
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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
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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
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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
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
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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
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
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Abstract
The invention discloses a measuring instrument for detecting the pressure-bearing limit value of a steel pipe and a using method thereof, wherein the measuring instrument comprises the following steps: the working table comprises a testing area and a force distribution area arranged on one side of the testing area, the force distribution area is provided with a fixing ring, force distribution hammers are arranged on the force distribution area, the size of each force distribution hammer head is different, the force distribution hammers are connected to a force distribution plate, the testing area is provided with a lifting plate, one side of the lifting plate is provided with a gravity hammer, the gravity hammer is connected with a weight regulator, the other side of the lifting plate is provided with a fixing knob, the testing area also comprises fixing points, the fixing points are arranged in the range of the testing area in parallel, each fixing point is internally provided with a force measuring device, the force measuring devices are connected with a display screen, the steel pipe is subjected to primary pressure by the force distribution hammers on the force distribution area, the bending performance of the steel pipe is detected, the steel pipe subjected to the pressure by the force distribution hammers is transmitted to the testing area, the tensile strength of the steel pipe is obtained after the steel pipe is subjected to a certain force distribution bending moment, and the gravity pressure is applied to the steel pipe, and (5) calculating the limit pressure value of the steel pipe.
Description
Technical Field
The invention relates to the field of building material quality inspection and load measurement, in particular to a measuring instrument for detecting a pressure-bearing limit value of a steel pipe and a using method thereof.
Background
Steel pipes are steel with a hollow cross section whose length is much greater than the diameter or circumference. The steel pipe is divided into round, square, rectangular and special-shaped steel pipes according to the shape of the cross section; the steel pipe is divided into a carbon structural steel pipe, a low-alloy structural steel pipe, an alloy steel pipe and a composite steel pipe according to the material quality; the steel pipes are divided into steel pipes for conveying pipelines, engineering structures, thermal equipment, petrochemical industry, machinery manufacturing, geological drilling, high-pressure equipment and the like according to the application; the production process includes seamless steel pipe and welded steel pipe, the seamless steel pipe includes hot rolling and cold rolling (drawing), and the welded steel pipe includes straight seam welded steel pipe and spiral seam welded steel pipe. Steel pipes are not only used for transporting fluids and powdery solids, exchanging heat energy, manufacturing mechanical parts and containers, but also are economical steels. The steel pipe is used for manufacturing the building structure net rack, the supporting column and the mechanical support, so that the weight can be reduced, the metal can be saved by 20-40%, and the industrialized mechanized construction can be realized. The steel pipe is used for manufacturing the highway bridge, so that steel can be saved, the construction is simplified, the area of a coating protective layer can be greatly reduced, and the investment and the maintenance cost are saved.
The deformation resistance of the steel pipe is one of important performance indexes, and the steel pipe in a special scene should be subjected to deformation resistance detection before installation and use, so that the safety production is ensured, and the safety accident caused by the deformation of the pipeline is avoided. The steel pipe detection at the present stage mostly adopts point taking detection, the mode has limited effect, and each section of the steel pipe cannot meet the use standard, so that a device capable of detecting the pressure bearing limit of the steel pipe in different stress states and different bending states is needed.
Disclosure of Invention
The invention overcomes the defects of the prior art and provides a measuring instrument for detecting the pressure-bearing limit value of a steel pipe and a using method thereof.
In order to achieve the purpose, the invention adopts the technical scheme that: a measuring instrument for detecting the pressure-bearing limit value of a steel pipe and a using method thereof comprise: the device comprises a workbench and a display connected with the workbench, and is characterized in that the workbench comprises a testing area and a force dividing area arranged on one side of the testing area, a fixing ring is arranged on the force dividing area, a plurality of force dividing hammers are arranged on the force dividing area, the hammer heads of the force dividing hammers are different in size, the force dividing hammers are connected to a force dividing plate, and a force application device is arranged on the force dividing plate;
the test area is provided with a lifting plate, one side of the lifting plate is provided with a gravity hammer, the gravity hammer is connected with a gravity regulator, the gravity regulator is connected with the display, and the other side of the lifting plate is provided with a fixed knob which can fix a steel pipe;
the test area also comprises fixed points which are arranged in parallel in the range of the test area, and each fixed point is internally provided with a force measuring device which is connected with the display screen.
In a preferred embodiment of the invention, the test area is provided with a safety rod, the safety rod is formed by combining a plurality of sections of safety rods, a hydraulic pump is arranged in the workbench, one end of the safety rod is connected to the hydraulic pump, the lifting plate is provided with a safety hole, and the other end of the safety rod can penetrate through the safety hole.
In a preferred embodiment of the invention, a locking nut is arranged on the lifting plate and connected to the lifting plate through a fixing piece, and a magnetic cushion layer is arranged on the locking nut and arranged on a contact surface of the locking nut and the steel pipe to be tested.
In a preferred embodiment of the present invention, the lifting plate is disposed on a lifting rod, the lifting rod is provided with a sliding slot, and a connecting end of the lifting plate and the lifting rod is provided with a sliding block, and the sliding block can move in the sliding slot.
In a preferred embodiment of the present invention, the force-dividing hammers are sequentially arranged from the lifting plate to the workbench, and the hammer heads are sequentially reduced in size from top to bottom.
In a preferred embodiment of the present invention, the force distribution area and the detection area are connected by a conveyor belt, the conveyor belt includes a sliding groove and a roller, the fixing ring is fixed on the roller, and the roller can slide on the sliding groove.
In a preferred embodiment of the invention, the upper fixing ring of the workbench is provided with a load sensor, and the load sensor is provided with a pressed part which is overlapped with the fixed position of the steel pipe.
In a preferred embodiment of the present invention, the pressure receiving portion is provided with a strain gauge, the strain gauge is connected to the pressure receiving portion and the steel pipe at an angle, and the strain gauge is configured to detect tensile deformation of the steel pipe after being pressed.
In a preferred embodiment of the invention, the use method of the measuring instrument for detecting the pressure bearing limit value of the steel pipe comprises the following steps:
s1, component force: fixing the steel pipe in a force distribution area fixing ring, applying force to a force distribution hammer through a force application device, and knocking the steel pipe by the force distribution hammer to enable the steel pipe to be sunken;
s2, force application: conveying the steel pipe with the dent to a detection area, fixing the steel pipe on a fixing ring, applying force to the steel pipe through a lifting plate, and displaying the force applied to the steel pipe by a force measurer in the test area in the force application process;
s3, statistics: tabulate and count the force W applied by the force-dividing hammer, the force Q applied by the gravity hammer and the bending degree S of the steel pipe.
In a preferred embodiment of the present invention, step S1 includes the following steps:
-case 1: the force dividing hammer is 5cm-20cm in diameter, and the applied force is 18MPa-25 MPa;
case 2: the force-dividing hammer does not impact the steel pipe, and the steel pipe directly enters a detection area from the force-dividing area;
case 3: the diameter of the component force hammer is 25cm-40cm, and the magnitude of the applied force is 25MPa-40 MPa.
In a preferred embodiment of the present invention, the step S2 shows the following three cases in the case of the step S1:
-case 1: the output gravity of the gravity regulator is 25MPa-27 MPa;
case 2: the output gravity of the gravity regulator is 22MPa-25 MPa;
case 3: the output gravity of the gravity regulator is 20MPa-22 MPa.
In a preferred embodiment of the invention, at least five steel pipes are required in the detection process, the stress of each steel pipe is different during detection, and the thickness, the diameter and the specification of the steel pipe are the same in the same detection process.
The invention solves the defects in the background technology, and has the following beneficial effects:
(1) the method comprises the following steps of performing primary pressure on a steel pipe through a component force hammer on a force distribution area, detecting the bending performance of the steel pipe, transmitting the steel pipe subjected to the pressure by the component force hammer to a test area, detecting the tensile strength of the steel pipe after the steel pipe is subjected to certain bending moment force, performing gravity pressure on the steel pipe, and calculating the maximum pressure value which can be borne by the steel pipe, wherein the maximum pressure value is used for repairing the steel pipe or detecting whether the steel pipe meets the quality in the later period, for example: when the force of the steel pipe which is impacted by the outside is 18MPa, the safety coefficient of the steel pipe is 2, the outer diameter of the steel pipe is 121mm, and the wall thickness of the seamless steel pipe is 5mm, through a formula, the pressure (MPa)/safety coefficient which can be borne by the pipe is equal to the tensile strength (MPa) of the pipe x the wall thickness (m) of the pipe/the inner diameter (m) of the pipe, the pressure which can be borne by the pipe can be 11.2613MPa, when the steel pipe in a building is impacted, the danger value of the steel pipe can be estimated according to the maximum pressure range which can be borne by the steel pipe, and therefore the steel pipe can be repaired or replaced selectively.
(2) The invention has the advantages that different bending moment forces are applied to the steel pipe by the component force hammers with different specifications on the stress distribution area, the bending degree of the steel pipe is different due to different bending moment forces, the maximum bearing force which can be accepted by the steel pipe under different bending degrees is detected, the range value of the bearing force of the steel pipe under various different force conditions in the use state is checked, whether the steel-tapping pipe meets the delivery specification is checked, compared with the method that the steel pipe is impacted and stretched by only using single same force, the obtained data of the steel pipe is single, and the bearing range value of the steel pipe cannot be explained, the invention has more rigor and accuracy, the mode of the component force hammers is adopted, different positions of the steel pipe are impacted, the change value of the bearing limit range borne by the whole steel pipe can be detected when the steel pipe is stressed and bent at different positions, if the steel pipe is impacted by foreign objects when in use, the impacted position of the steel pipe can be checked according to the data, therefore, whether the steel pipe needs to be replaced or not is considered, labor force is reduced, and waste of resources is avoided.
(3) When the invention is used, a plurality of fixed points are arranged on a test area, a fixed ring is arranged on the fixed points, a force measuring device is arranged in the fixed ring, the force measuring device is a load sensor, the load sensor and the steel pipe are connected through a strain gauge, the load sensor can not only detect the gravity borne by the steel pipe but also detect the bending moment force and the torque force borne by the steel pipe in the process of bearing the force on the steel pipe, the load sensor can generate different numerical value changes under the influence of the bending moment force and the torque force, so that the quantity of the bending moment force and the torque force respectively borne by the steel pipe when the steel pipe is impacted by the gravity under different states can be obtained by adopting a plurality of groups of data acquisition, the strain gauge arranged between the load sensor and the steel pipe can detect the deformation quantity of the main body of the steel pipe which is subjected to tensile deformation, thereby the ratio of the deformation curvature of the steel pipe to the gravity borne can be obtained, and the bending performance of the steel pipe can be obtained, thereby detecting whether the steel pipe is qualified or not.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts;
FIG. 1 is a perspective block diagram of a preferred embodiment of the present invention;
fig. 2 is a preferred embodiment of the present invention.
In the figure: 1. a work table; 2. a display; 3. a test zone; 31. a lifting plate; 310. a safety vent; 32. a gravity adjuster; 33. a fixed point; 34. a safety lever; 35. a chute; 4. a force-dividing plate; 41. force dividing hammer; 7. a sliding groove.
Detailed Description
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.
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 herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be considered limiting of the scope of the present application. Furthermore, the terms "one end", "the other end", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "one end," "the other end," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, "a plurality" means two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "connected," and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art through specific situations.
As shown in fig. 1, a measuring instrument for detecting a pressure-bearing limit value of a steel pipe 6 includes: the steel pipe bending test device comprises a workbench 1 and a display 2 connected with the workbench 1, wherein the workbench 1 comprises a test area 3 and a force division area arranged on one side of the test area 3, fixing rings are arranged on the force division area to fix a steel pipe 6 to be tested and prevent the steel pipe 6 from inclining in the stress process, a plurality of force division hammers 41 are arranged on the force division area, hammer heads of the force division hammers 41 are different in size and provide different bending moment forces for the steel pipe 6, the bending degrees of the steel pipe 6 are different, the force division hammers 41 are connected to a force division plate 4, a force application device is arranged on the force division plate 4, and the force division plate 4 applies force to the steel pipe 6.
The force-dividing hammers 41 are sequentially arranged from the lifting plate 31 to the workbench 1, the hammer heads are sequentially reduced from top to bottom, different bending moment forces are applied to the steel pipe 6 by the force-dividing hammers 41 with different specifications on a force-dividing area, so that the bending degree of the steel pipe 6 is different due to different bending moment forces, the maximum bearing pressure which can be accepted by the steel pipe 6 under different bending degrees is detected, the range value of the bearing pressure of the steel pipe 6 under various different force conditions in a use state is checked, whether the steel pipe 6 meets the factory specifications is checked, compared with the method of performing impact and stretching experiments on the steel pipe 6 by using only single same force, the obtained data of the steel pipe 6 is single and is not enough to explain the bearing range value of the steel pipe 6, the invention has more rigor accuracy, and the form of the force-dividing hammers 41 is adopted to impact the steel pipe 6 at different positions, and can also detect that the steel pipe 6 is bent under different forces, the whole pressure-bearing limit range change value that receives of steel pipe 6 if by the foreign object striking when steel pipe 6 uses, can look over steel pipe 6 by the striking position according to data to whether consider and need replace steel pipe 6, avoided the waste of resource when having reduced the labour.
The test area 3 is provided with lifter plate 31, and lifter plate 31 one side is provided with gravity hammer 32, and gravity hammer 32 is connected with the weight regulator, and the weight regulator passes through transmission line 21 and is connected with display 2, adjusts application of force weight through the last button of display 2 to record its data, and the lifter plate 31 another side is provided with fixed knob, and fixed knob can fix steel pipe 6, makes its steel pipe 6 can not take place the skew when receiving the application of force of gravity hammer 32, leads to roll-off test area 3.
The method comprises the steps of performing primary pressure on a steel pipe 6 through a component force hammer 41 on a force distribution area, detecting the bending performance of the steel pipe 6, transmitting the steel pipe 6 subjected to the pressure by the component force hammer 41 to a test area 3, detecting the tensile strength of the steel pipe 6 after the steel pipe 6 is subjected to a certain bending moment force, performing gravity pressure on the steel pipe 6, and further calculating the maximum pressure value which can be borne by the steel pipe 6, wherein the maximum pressure value is used for repairing the steel pipe 6 or detecting whether the steel pipe 6 meets the quality in the later period, for example: when the force of the steel pipe 6 impacted by the outside is 18MPa, the safety coefficient of the steel pipe 6 is 2, the outer diameter of the steel pipe 6 is 121mm, and the wall thickness of the seamless steel pipe 6 is 5mm, the pressure (MPa)/safety coefficient which can be borne by the pipe is equal to the tensile strength (MPa) of the pipe x the wall thickness (m) of the pipe/the inner diameter (m) of the pipe, the pressure which can be borne by the pipe is 11.2613MPa, when the steel pipe 6 in a building is impacted, the dangerous value of the steel pipe 6 can be estimated according to the maximum pressure range which can be borne by the steel pipe 6, and therefore the steel pipe 6 can be repaired or replaced selectively.
The test area 3 also comprises fixed points 33, the fixed points 33 are arranged in the range of the test area 3 in parallel, each fixed point 33 is internally provided with a force measuring device which is connected with a display screen, the fixed points 33 are formed by combining gears, when the steel pipe 6 is stressed, the stress condition of the pipe wall of the steel pipe 6 is transmitted to the fixed points 33, when in use, the test area 3 is provided with a plurality of fixed points 33, fixed rings are arranged on the fixed points 33, the force measuring devices are arranged in the fixed rings and are load sensors, the load sensors are connected with the steel pipe 6 through the strain gauges, when the steel pipe 6 is stressed, the load sensors not only can detect the gravity borne by the steel pipe 6, but also can detect the bending moment force and the torque force borne by the steel pipe 6, the load sensors can generate different numerical value changes under the influence of the bending moment force and the torque force, thereby, when the steel pipe 6 is impacted by the gravity under different states by adopting a plurality of groups of data acquisition, the amount of the bending moment and the amount of the torque which are respectively applied to the steel tube 6, and the strain gauge arranged between the load sensor and the steel tube 6 can detect the deformation of the steel tube 6 caused by tensile deformation, so that the ratio of the deformation curvature of the steel tube 6 to the gravity applied to the steel tube 6 can be obtained, the bending performance of the steel tube 6 can be obtained, and whether the steel tube 6 is qualified or not can be detected.
The test area 3 is provided with a safety rod 34, the safety rod 34 is formed by combining a plurality of safety rods, a hydraulic pump is arranged in the workbench 1, one end of the safety rod 34 is connected to the hydraulic pump, the safety rod 34 is lifted by the hydraulic pump after the steel pipe 6 enters a fixed point 33, the safety rod 34 is arranged on the opposite surface of the force application surface of the separating hammer of the steel pipe 6 and is not positioned at the central position of the steel pipe 6, when the steel pipe 6 is extruded by gravity and is broken, the steel pipe 6 is firstly broken in a damaged area, so that the steel pipe 6 is arranged on the opposite surface, the displacement of the steel pipe 6 can be ensured when the steel pipe 6 is broken, the steel pipe 6 is arranged at the rear central position, when the lifting plate 31 is placed to apply force to the steel pipe 6, part of the force is separated by the safety rod 34, so that the data is inaccurate, the safety hole 310 is arranged on the lifting plate 31, the other end of the safety rod 34 can pass through the safety hole 310, and the safety rod 34 is not contacted with the lifting plate 31, avoided the lifter plate 31 to do all can by safety lever 34 dispersion to lead to the data result inaccurate, steel pipe 6 can split at any time under the pressure circumstances, and safety lever 34 fracture steel pipe 6 is fixed in the detection zone when steel pipe 6 splits, makes its steel pipe 6 can not be in the departure displacement district, has guaranteed experimenter's safety, compares baffle or box structure, and safety lever 34 is light area little more.
Be provided with lock nut on the lifter plate 31, lock nut passes through the mounting and connects on lifter plate 31, the last magnetic cushion layer that is provided with of lock nut, the magnetic cushion layer sets up at lock nut and the 6 contact surfaces of steel pipe that awaits measuring, 6 outer lane faces of lock nut locking steel pipe, the magnetic cushion layer adsorbs on the outer lane is comprehensive, fix steel pipe 6 on lifter plate 31, lifter plate 31 sets up on lifter 35, lifter plate 31 can rise or fall, thereby adjust the contact distance of lifter plate 31 and steel pipe 6, and exert force to steel pipe 6 simultaneously, be provided with the spout on lifter 35, lifter plate 31 and lifter 35 link are provided with the slider, the slider can move in the spout, through the vertical motion of slider on the spout, constantly change the lift condition of lifter plate 31, thereby exert pressure to steel pipe 6.
Be connected through the conveyer belt between component area and the detection zone, the conveyer belt includes sliding tray 5 and gyro wheel, gu fixed ring fixes on the gyro wheel, the gyro wheel can slide on sliding tray 5, gu fixed ring moves on sliding tray 5, transport steel pipe 6 by component area to test section 3 and detect, gu fixed ring is provided with load sensor on the workstation 1, load sensor has the portion of receiving the pressure, the portion of receiving the pressure coincides with 6 fixed positions of steel pipe, load sensor detects steel pipe 6 receives gravity and 6 self weights of steel pipe. Be provided with the strainometer on the pressure receiving portion, the strainometer is the angular connection on pressure receiving portion and steel pipe 6, and the strainometer is used for detecting the tensile deformation after the steel pipe 6 is compressed.
As shown in FIG. 2, a method for using a measuring instrument for detecting the pressure-bearing limit value of a steel pipe 6 comprises the following steps:
s1, component force: fixing the steel pipe 6 in the component area fixing ring, applying force to the force-applying hammer 41 through a force-applying device, and knocking the steel pipe 6 by the force-applying hammer 41 to enable the steel pipe 6 to be sunken;
s2, force application: conveying the steel pipe 6 with the dent to a detection area, fixing the steel pipe on a fixing ring, applying force to the steel pipe 6 through a lifting plate 31, and displaying the force applied to the steel pipe 6 by a force measurer in the test area 3 in the force application process;
s3, statistics: tabulated statistics are made of the force W applied by the weight 41, the force Q applied by the weight 32, and the degree of bending S of the steel pipe 6.
Step S1 includes the following cases:
-case 1: the size of the force-dividing hammer 41 is 5cm-20cm in diameter, and the magnitude of applied force is 18MPa-25 MPa;
case 2: the force-dividing hammer 41 does not impact the steel pipe 6, and the steel pipe 6 directly enters a detection area from the force-dividing area;
case 3: the diameter of the force-dividing hammer 41 is 25cm-40cm, and the applied force is 25MPa-40 MPa.
Step S2 presents the following three cases in the case of step S1:
-case 1: the output gravity of the gravity regulator is 25MPa-27 MPa;
case 2: the output gravity of the gravity regulator is 22MPa-25 MPa;
case 3: the output gravity of the gravity regulator is 20MPa-22 MPa.
The number of the steel pipes required in the detection process is at least five, the stress of each steel pipe is different when the steel pipe is detected, and the thickness, the diameter and the specification of the steel pipe are the same in the same detection process.
For example, 6 seamless steel pipes with the outer diameter of 121cm, the wall thickness of 5cm and the safety factor of 2 are detected:
the bearable pressure (MPa) of the steel pipe 1/the safety factor (MPa) of the steel pipe x the tensile strength (MPa) of the steel pipe x the wall thickness (m) of the pipe/the inner diameter (m) of the pipe can obtain the bearable pressure of the steel pipe of 11.2613MPa, and when the steel pipe is sunken due to external impact force and the size of a sunken opening is 10cm, the steel pipe can be vertically broken under the gravity of 28 MPa.
In light of the foregoing description of the preferred embodiment of the present invention, it is to be understood that various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. A measuring instrument for detecting the pressure bearing limit value of a steel pipe comprises: a workbench and a display connected with the workbench, which is characterized in that,
the workbench comprises a testing area and a force distribution area arranged on one side of the testing area, a fixing ring is arranged on the force distribution area, a plurality of force distribution hammers are arranged on the force distribution area, hammer heads of the force distribution hammers are different in size, the force distribution hammers are connected to a force distribution plate, and a force application device is arranged on the force distribution plate;
the testing area is provided with a lifting plate, one side of the lifting plate is provided with a gravity hammer, the gravity hammer is connected with a gravity regulator, the gravity regulator is connected with the display, and the other side of the lifting plate is provided with a fixed knob which can fix a steel pipe;
the test area also comprises fixed points which are arranged in parallel in the range of the test area, and each fixed point is internally provided with a force measuring device which is connected with the display screen.
2. The measuring instrument for detecting the pressure bearing limit value of the steel pipe according to claim 1, wherein: the test area is provided with the safety lever, the safety lever is formed by combining a plurality of sections of safety rods, a hydraulic pump is arranged in the workbench, one end of the safety lever is connected to the hydraulic pump, a safety hole is formed in the lifting plate, and the other end of the safety lever can penetrate through the safety hole.
3. The measuring instrument for detecting the pressure bearing limit value of the steel pipe according to claim 1, wherein: the steel pipe lifting device is characterized in that a locking nut is arranged on the lifting plate and connected to the lifting plate through a fixing piece, a magnetic cushion layer is arranged on the locking nut, and the magnetic cushion layer is arranged on the contact surface of the locking nut and a steel pipe to be tested.
4. The measuring instrument for detecting the pressure bearing limit value of the steel pipe as claimed in claim 1, wherein: the lifting plate is arranged on the lifting rod, a sliding groove is formed in the lifting rod, a sliding block is arranged at the connecting end of the lifting plate and the lifting rod, and the sliding block can move in the sliding groove.
5. The measuring instrument for detecting the pressure bearing limit value of the steel pipe according to claim 1, wherein: the component power hammer by the lifter plate extremely the workstation arranges in proper order, the tup size reduces from top to bottom in proper order.
6. The measuring instrument for detecting the pressure bearing limit value of the steel pipe according to claim 1, wherein: the partition force district with connect through the conveyer belt between the detection zone, the conveyer belt includes sliding tray and gyro wheel, gu fixed ring fixes on the gyro wheel, the gyro wheel can slide on the sliding tray.
7. A use method of a measuring instrument for detecting the bearing limit value of a steel pipe according to any one of claims 1 to 6, comprising the following steps:
s1, component force: fixing the steel pipe in a force distribution area fixing ring, applying force to a force distribution hammer through a force application device, and knocking the steel pipe by the force distribution hammer to enable the steel pipe to be sunken;
s2, force application: conveying the steel pipe with the dent to a detection area, fixing the steel pipe on a fixing ring, applying force to the steel pipe through a lifting plate, and displaying the force applied to the steel pipe by a force measurer in the test area in the force application process;
s3, statistics: tabulate and count the force W applied by the force-dividing hammer, the force Q applied by the gravity hammer and the bending degree S of the steel pipe.
8. The use method of the measuring instrument for detecting the pressure bearing limit value of the steel pipe according to claim 7 is characterized in that: step S1 includes the following cases:
-case 1: the force dividing hammer is 5cm-20cm in diameter, and the applied force is 18MPa-25 MPa;
case 2: the force-dividing hammer does not impact the steel pipe, and the steel pipe directly enters a detection area from the force-dividing area;
case 3: the diameter of the component force hammer is 25cm-40cm, and the magnitude of the applied force is 25MPa-40 MPa.
9. The use method of the measuring instrument for detecting the pressure bearing limit value of the steel pipe according to claim 8 is characterized in that: step S2 presents the following three cases in the case of step S1:
-case 1: the output gravity of the gravity regulator is 25MPa-27 MPa;
case 2: the output gravity of the gravity regulator is 22MPa-25 MPa;
case 3: the output gravity of the gravity regulator is 20MPa-22 MPa.
10. The use method of the measuring instrument for detecting the pressure bearing limit value of the steel pipe according to claim 7 is characterized in that: the number of the steel pipes required in the detection process is at least five, the stress of each steel pipe is different when the steel pipe is detected, and the thickness, the diameter and the specification of the steel pipe are the same in the same detection process.
Priority Applications (1)
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117420034A (en) * | 2023-12-18 | 2024-01-19 | 哈尔滨学院 | Exercise equipment welding strength detection device |
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