CN112504861B - Intelligent testing device and testing method for rubber stretching - Google Patents
Intelligent testing device and testing method for rubber stretching Download PDFInfo
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- CN112504861B CN112504861B CN202011564717.0A CN202011564717A CN112504861B CN 112504861 B CN112504861 B CN 112504861B CN 202011564717 A CN202011564717 A CN 202011564717A CN 112504861 B CN112504861 B CN 112504861B
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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
- G01N3/16—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces applied through gearing
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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
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording 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
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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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
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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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
- G01N2203/0032—Generation of the force using mechanical means
- G01N2203/0037—Generation of the force using mechanical means involving a rotating movement, e.g. gearing, cam, eccentric, or centrifuge effects
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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
- G01N2203/005—Electromagnetic 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
- G01N2203/0075—Strain-stress relations or elastic constants
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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
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Abstract
The invention belongs to the technical field of rubber industry, in particular to an intelligent testing device and a testing method for rubber stretching, aiming at the problems that the replacement process of a sample is complicated, the internal sample clamp needs to be disassembled and assembled for many times, the two ends of the rubber sample need to be tightly clamped and fixed in the testing process, the clamping part is always broken first in the stretching process, and the testing result is inaccurate, the intelligent testing device comprises a base, wherein a supporting shell is fixedly arranged at the top of the base, a partition plate is fixedly arranged in the middle of the inner wall of the supporting shell, and a testing rotating shaft is arranged at the bottom end of the interior of the supporting shell through a bearing. When the rubber strip sample is subjected to tensile test, the impact inertia of the two end parts when the rubber strip is broken can be effectively reduced, the displacement control of the fixed seats at the two ends is more accurate, the surface cracks and the tensile state of the sample can be observed more visually in the tensile test process, and the accuracy and the safety of the test result are improved.
Description
Technical Field
The invention relates to the technical field of rubber industry, in particular to an intelligent testing device and an intelligent testing method for rubber stretching.
Background
The rubber is a high-elasticity polymer material with reversible deformation, is rich in elasticity at room temperature, can generate large deformation under the action of small external force, and can recover the original shape after the external force is removed. The rubber is a completely amorphous polymer. The rubber is divided into natural rubber and synthetic rubber. The natural rubber is prepared by extracting colloid from plants such as rubber tree and rubber grass and processing; synthetic rubbers are obtained by polymerization of various monomers. Rubber products are widely used in industry or in various aspects of life.
The rubber industry is one of the important basic industries of national economy. It not only provides daily and medical light industrial rubber products which are indispensable to daily life for people, but also provides various rubber production equipment or rubber parts for heavy industries such as mining, traffic, building, machinery, electronics and the like and emerging industries, in the rubber material and product with strict quality requirements, such as tensile strength, elastic modulus, elongation, aging resistance, etc., the tensile strength test of rubber can determine the tensile strength of rubber, at present, for the tensile test of rubber, the rubber is mainly made into a standard strip-shaped or I-shaped sample, and the two ends of the sample are fixed on a stretching machine for testing, but the replacement process of each sample is complicated, the internal sample clamp needs to be disassembled and assembled for many times, secondly, the two ends of the rubber sample need to be tightly clamped and fixed in the test process, and the clamping part is often broken first in the stretching process, so that the test result is inaccurate.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides an intelligent testing device for rubber stretching and a testing method thereof.
The invention provides a rubber tensile testing device which comprises a base, wherein a supporting shell is fixedly arranged at the top of the base, a partition plate is fixedly arranged in the middle of the inner wall of the supporting shell, a testing rotating shaft is arranged at the bottom end inside the supporting shell through a bearing, transmission chain wheels are fixedly arranged at two ends of the testing rotating shaft, threaded sleeves are arranged at the tops of two sides of the supporting shell through bearings, the outer sides of the transmission chain wheels are in transmission connection with the threaded sleeves through chains, a stepping motor is fixedly arranged at the top of the base, and transmission gears which are meshed with each other are fixedly arranged between an output shaft of the stepping motor and the outer sides of the testing rotating shaft;
threaded lead screws are screwed in the two threaded sleeves, tension sensors are fixedly mounted at the ends, close to each other, of the two threaded lead screws, fixed seats are fixedly mounted at the sides, close to each other, of the two tension sensors, rubber fastening clamps are inserted in the two fixed seats, rectangular sliding rods are fixedly mounted above the inner part of the supporting shell, and the bottoms of the two fixed seats are connected with the rectangular sliding rods in a sliding manner;
the middle part sliding connection of rectangle slide bar has thickness measuring mechanism, and the top of rectangle slide bar is provided with the mounting groove, the inside of mounting groove is inlayed and is equipped with the electronic ruler, and thickness measuring mechanism and the inside of fixing base all are inlayed and are equipped with the range finding sensor with electronic ruler looks adaptation, be provided with self-locking mechanism between baffle and the test pivot.
Preferably, rubber fastening anchor clamps include that the section is the elasticity splint of V type structure, and the tip of elasticity splint is the arc structure, and the both sides inner wall edge of elasticity splint all is provided with planar structure's indentation portion, and the side of indentation portion is provided with the tooth portion that a plurality of sections are trapezium structure, and the top of elasticity splint is provided with handle portion.
Preferably, the fixing base includes the pedestal that is located the upper end, and the top of pedestal is provided with the slot part with elasticity splint looks adaptation, and the bottom of pedestal is provided with the spacing frame with rectangle slide bar sliding connection, and distance measuring sensor is located the inside of spacing frame.
Preferably, thickness measuring mechanism includes the support frame with rectangle slide bar sliding connection, and the top fixed mounting of support frame has the rectangle pole, and interconnect's spring and adjustable shelf have been cup jointed in the outside of rectangle pole, and the inside both sides of adjustable shelf all are provided with the thickness measuring subassembly.
Preferably, the thickness measuring component comprises a displacement sensor screwed on the inner side of the movable frame, measuring rollers are fixedly mounted at one ends, close to each other, of the two displacement sensors, and the two measuring rollers are in mutual contact and distributed on two sides of the axis of the fixed seat.
Preferably, the self-locking mechanism comprises an electric push rod fixedly connected with the partition plate, a locking assembly is fixedly mounted at the end of the electric push rod, the self-locking mechanism further comprises a limiting gear fixedly mounted on the outer side of the test rotating shaft, and a plurality of limiting groove portions matched with the locking assembly are arranged on the outer surface of the limiting gear.
Preferably, the locking assembly comprises a locking plate with a trapezoidal structure, an expansion piece with a T-shaped section is fixedly mounted on the outer side of the locking plate, and a limiting sliding groove in sliding connection with the top end of the expansion piece is formed in the bottom of the partition plate.
Preferably, both sides of the support shell are fixedly provided with isolation covers, and the tail ends of the transmission chain wheel, the chain and the threaded screw rod are positioned in the isolation covers.
A rubber tensile test method comprises the following steps:
firstly: connecting the rubber tensile testing device with a computer through signals, testing whether an electric signal in the device is connected or not, and resetting by using a fixed seat in the computer control device;
secondly, the method comprises the following steps: inserting two ends of the rubber strip cut into a strip shape or an I shape into the rubber fastening clamp, and inserting the rubber fastening clamp into the fixed seat;
secondly, the method comprises the following steps: the device drives two symmetrically distributed threaded screw rods to move by virtue of a stepping motor, a transmission gear, a test rotating shaft and a threaded sleeve, the fixed seats at the two ends of the rubber strip to be detected and the rubber fastening clamp are simultaneously pulled to move in opposite directions by virtue of the threaded screw rods and a tension sensor, and after the rubber strip is fixed, the middle rubber strip to be detected is pulled to stretch, and the rubber strip is straightened;
secondly, the method comprises the following steps: recording the distance between the two fixed seats, recording the force values measured by the tension sensors at the two ends, simultaneously measuring the thicknesses of the front section, the middle section and the rear section of the rubber strip in sequence by the thickness measuring mechanism, and recording the measured position information;
secondly, the method comprises the following steps: setting relative displacement speeds of the fixing seats at the two ends according to requirements, driving the rubber strip to stretch by utilizing the movement of the fixing seats at the two ends, locking the device through a self-locking mechanism after reaching a set displacement distance each time, avoiding the change of the distance between the two fixing seats, and recording the stretching force at the moment;
secondly, the method comprises the following steps: after the distance between the two fixed seats is locked, the thicknesses of the front section, the middle section and the rear section of the rubber strip at the moment are sequentially measured through a thickness measuring mechanism, and the measured position information is recorded;
secondly, the method comprises the following steps: repeating the steps, and measuring a plurality of groups of tensile force, tensile length and thickness data of each section of the rubber strip to obtain a stress-strain curve of the rubber sample;
and finally: when the rubber strip breaks, recording the instantaneous stress value and the distance between the two fixed seats when the rubber strip breaks, and obtaining the tensile strength value of the rubber sample.
Compared with the prior art, the invention provides an intelligent testing device and a testing method for rubber stretching, which have the following beneficial effects:
rely on step motor in the device, drive gear, test pivot and threaded sleeve drive the screw lead screw of two symmetric distributions and move, the fixing base that is located detection rubber strip both ends and the rubber fastening anchor clamps phase opposite motion are pulled simultaneously through screw lead screw and force sensor, when carrying out tensile detection to the rubber strip sample, the impact inertia of both ends spare when can effectual reduction rubber strip fracture, secondly, displacement control to both ends fixing base is more accurate, can more audio-visual observation sample surface crack and tensile state in tensile test process, improve the accuracy and the security of testing result.
After inserting rubber fastening anchor clamps at the sample both ends, directly insert inside the slot portion with rubber fastening anchor clamps, rubber fastening anchor clamps receive the pulling force effect in tensile test process under, the inner wall of slot portion is extruded to its outer wall, and then make the connecting portion clearance of elasticity splint and sample littleer and more, play stable auto-lock effect to rubber strip sample both ends, the effectual sample obscission that avoids appearing, secondly, the sample installation is simple and convenient, simplify the fixed process of sample, effectual improvement tensile test's efficiency.
In the rubber stretching detection process, a detector can move the thickness measuring mechanism to slide on the rectangular sliding rod, so that the position of thickness measurement is recorded, and meanwhile, the thickness measuring assembly spans across the rubber strip in the stretching state by pressing the movable frame in the middle of the thickness measuring mechanism, so that the thickness of the sample in the stretching state can be obtained, the deformation data of the rubber strip is obtained, and the measurement is simple and convenient.
At the thickness measurement in-process, the measuring roller through both sides rolls in rubber strip both sides, and then extrudees two displacement sensor in order to obtain the displacement volume of both sides, calculates the thickness parameter of rubber strip, and roll connection between measuring roller and the rubber strip surface avoids producing the mar on the sample surface and influences tensile test, and secondly, two measuring roller drive the displacement sensor of both sides simultaneously and remove, and the mutual certificate of measurement process nature measurement accuracy is high.
When step motor stall, electric putter promotes the locking subassembly and moves forward, and then inserts the spacing groove portion of limiting gear with the bottom of locking subassembly, accomplishes the location work to the test pivot, avoids appearing the displacement phenomenon when receiving the pulling force, improves tensile test's precision.
Drawings
FIG. 1 is a schematic cross-sectional view of a rubber tensile testing apparatus according to the present invention;
FIG. 2 is a schematic view of a fixing base of the rubber tensile testing apparatus according to the present invention;
FIG. 3 is a schematic structural view of a rubber fastening clamp of the rubber tensile testing apparatus according to the present invention;
FIG. 4 is a schematic diagram of a partial top view of a rubber tensile testing apparatus according to the present invention;
FIG. 5 is a schematic structural view of a thickness measuring mechanism of the rubber tensile testing apparatus according to the present invention;
fig. 6 is a schematic structural view of a self-locking mechanism of a rubber tensile testing device according to the present invention.
In the figure: the device comprises a base 1, a transmission gear 2, a stepping motor 3, a testing rotating shaft 4, a threaded screw rod 5, a threaded sleeve 6, a tension sensor 7, a rubber fastening clamp 8, an elastic clamping plate 801, a handle 802, a tooth 803, an indentation 804, a thickness measuring mechanism 9, a supporting frame 901, a rectangular rod 902, a spring 903, a movable frame 904, a measuring roller 905, a displacement sensor 906, a fixed seat 10, a seat 1001, a limit frame 1002, a slot 1003, an isolation cover 11, a partition plate 12, a rectangular sliding rod 13, a support shell 14, a self-locking mechanism 15, an electric push rod 1501, an expansion piece 1502, a locking plate 1503, a limit gear 1504, a limit sliding slot 16 and a distance measuring sensor.
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.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Referring to fig. 1-6, a rubber tensile test device comprises a base 1, wherein a supporting shell 14 is fixedly installed at the top of the base 1, a partition plate 12 is fixedly installed in the middle of the inner wall of the supporting shell 14, a test rotating shaft 4 is installed at the bottom end inside the supporting shell 14 through a bearing, transmission chain wheels are fixedly installed at two ends of the test rotating shaft 4, threaded sleeves 6 are installed at the tops of two sides of the supporting shell 14 through bearings, the outer sides of the transmission chain wheels are in transmission connection with the threaded sleeves 6 through chains, a stepping motor 3 is fixedly installed at the top of the base 1, and transmission gears 2 which are meshed with each other are fixedly installed between an output shaft of the stepping motor 3 and the outer sides of the test rotating shaft 4;
threaded lead screws 5 are screwed in the two threaded sleeves 6, tension sensors 7 are fixedly mounted at the ends, close to each other, of the two threaded lead screws 5, fixed seats 10 are fixedly mounted at the sides, close to each other, of the two tension sensors 7, rubber fastening clamps 8 are inserted in the two fixed seats 10, rectangular slide rods 13 are fixedly mounted above the inner part of the supporting shell 14, and the bottoms of the two fixed seats 10 are connected with the rectangular slide rods 13 in a sliding mode;
the middle part sliding connection of rectangle slide bar 13 has thickness measuring mechanism 9, and the top of rectangle slide bar 13 is provided with the mounting groove, and the inside of mounting groove is inlayed and is equipped with the electronic ruler, and thickness measuring mechanism 9 and the inside of fixing base 10 all are inlayed and are equipped with the range sensor 17 with electronic ruler looks adaptation, are provided with self-locking mechanism 15 between baffle 12 and the test pivot 4.
In the invention, the rubber fastening clamp 8 comprises an elastic clamping plate 801 with a V-shaped cross section, the end part of the elastic clamping plate 801 is in an arc structure, the edges of the inner walls at two sides of the elastic clamping plate 801 are respectively provided with an indentation 804 with a planar structure, the side surface of the indentation 804 is provided with a plurality of tooth parts 803 with a trapezoidal cross section, the top end of the elastic clamping plate 801 is provided with a handle part 802, the main body of the rubber fastening clamp 8 is the elastic clamping plate 801 with the V-shaped structure, when a rubber strip sample is clamped, the indentation 804 is used for clamping and fixing the connection point part, so that the phenomenon that the connection point is creased or dented, the connection point is fractured in the stretching process is avoided, the stability in the side viewing process is improved, secondly, the stress points of the rubber strip sample are dispersed and effectively locked through the arrangement of the plurality of tooth parts 803, and the phenomenon that the two ends of the sample are displaced, the two ends of the rubber strip sample are effectively locked in the stretching process can be avoided, The falling phenomenon improves the safety in the process of tensile test.
In the invention, the fixed seat 10 comprises a seat body 1001 positioned at the upper end, the top end of the seat body 1001 is provided with a slot part 1003 matched with the elastic clamping plate 801, the bottom end of the seat body 1001 is provided with a limit frame 1002 connected with the rectangular sliding rod 13 in a sliding manner, the distance measuring sensor 17 is positioned inside the limit frame 1002, the fixed seat 10 is provided with the slot part 1003 with two sides distributed in an inclined manner, when a rubber sample is installed, after two ends of the sample are inserted into the rubber fastening clamp 8, the rubber fastening clamp 8 is directly inserted into the slot part 1003, the outer wall of the rubber fastening clamp 8 extrudes the inner wall of the slot part 1003 under the action of tensile force in the tensile test process, so that the gap between the elastic clamping plate 801 and the connecting part of the sample is smaller and smaller, the stable self-locking effect is achieved on the two ends of the rubber strip sample, the sample falling-off phenomenon is effectively avoided, secondly, the sample installation is simple and convenient, and the sample fixing process is simplified, the efficiency of tensile test is effectual improved.
In the invention, the thickness measuring mechanism 9 comprises a support frame 901 connected with the rectangular slide rod 13 in a sliding manner, a rectangular rod 902 is fixedly mounted at the top end of the support frame 901, a spring 903 and a movable frame 904 which are connected with each other are sleeved on the outer side of the rectangular rod 902, thickness measuring components are arranged on two inner sides of the movable frame 904, in the rubber stretching detection process, a detector can move the thickness measuring mechanism 9 to slide on the rectangular slide rod 13, so as to record the thickness measuring position, meanwhile, the movable frame 904 in the middle of the thickness measuring mechanism 9 is pressed, the two thickness measuring components are used for crossing over the rubber strip in the stretching state, the sample thickness in the stretching state can be obtained, the deformation data of the rubber strip is obtained, and the measurement is simple and convenient.
In the invention, the thickness measuring component comprises a displacement sensor 906 which is screwed on the inner side of the movable frame 904, one end of each of the two displacement sensors 906 which is close to each other is fixedly provided with a measuring roller 905, the two measuring rollers 905 are in contact with each other and distributed on two sides of the axis of the fixed seat 10, in the thickness measuring process, the two measuring rollers 905 on two sides roll on two sides of the rubber strip, and further the two displacement sensors 906 are extruded to obtain the displacement amount of the two sides, the thickness parameter of the rubber strip is calculated, in the measuring process, the measuring rollers 905 are in rolling connection with the surface of the rubber strip, the situation that the tensile test is influenced by scratches generated on the surface of a sample is avoided, secondly, the two measuring rollers 905 simultaneously drive the displacement sensors 906 on two sides to move, and the measuring accuracy of mutual verification in the measuring process is high.
In the invention, the self-locking mechanism 15 comprises an electric push rod 1501 fixedly connected with the partition plate 12, a locking assembly is fixedly arranged at the end part of the electric push rod 1501, the self-locking mechanism 15 further comprises a limit gear 1504 fixedly arranged at the outer side of the test rotating shaft 4, a plurality of limit groove parts matched with the locking assembly are arranged on the outer surface of the limit gear 1504, when the stepping motor 3 stops rotating, the electric push rod 1501 pushes the locking assembly to move forwards, the bottom end of the locking assembly is inserted into the limit groove parts of the limit gear 1504, the positioning work of the test rotating shaft 4 is completed, the displacement phenomenon when the test rotating shaft is subjected to tensile force is avoided, and the precision of the tensile test is improved.
In the invention, the locking assembly comprises a locking plate 1503 with a trapezoid structure, the outer side of the locking plate 1503 is fixedly provided with a telescopic piece 1502 with a T-shaped section, the bottom of the partition plate 12 is provided with a limiting sliding chute 16 which is in sliding connection with the top end of the telescopic piece 1502, and in the locking process, the telescopic piece 1502 forming the locking assembly slides in the limiting sliding chute 16, so that the phenomenon of deviation when the telescopic piece is stressed is avoided, and the stability of the self-locking mechanism 15 on the position locking of the device is improved.
According to the invention, the two sides of the supporting shell 14 are both fixedly provided with the isolation cover 11, and the tail ends of the transmission chain wheel, the chain and the threaded screw rod 5 are all positioned in the isolation cover 11, so that in the process of stretching detection, when the threaded screw rod 5 moves, the tail end of the threaded screw rod moves in the isolation cover 11, the influence of the external environment can be effectively avoided, and the touch phenomenon when a detector walks is avoided.
A rubber tensile test method comprises the following steps:
the first step is as follows: connecting the rubber tensile testing device with a computer through signals, testing whether an electric signal in the device is connected or not, and resetting by using a fixed seat 10 in the computer control device;
the second step is that: inserting two ends of the rubber strip cut into a strip shape or an I shape into the rubber fastening clamp 8, and inserting the rubber fastening clamp 8 into the fixed seat 10;
the third step: in the device, a stepping motor 3, a transmission gear 2, a test rotating shaft 4 and a threaded sleeve 6 drive two symmetrically distributed threaded screw rods 5 to move, fixing seats 10 at two ends of a rubber strip to be detected and a rubber fastening clamp 8 are simultaneously pulled to move in opposite directions through the threaded screw rods 5 and a tension sensor 7, and after the rubber strip is fixed, the middle rubber strip to be detected is pulled to be stretched, and the rubber strip is straightened;
the fourth step: recording the distance between the two fixed seats 10, recording the force values measured by the tension sensors 7 at the two ends, simultaneously sequentially measuring the thicknesses of the front section, the middle section and the rear section of the rubber strip through the thickness measuring mechanism 9, and recording the measured position information;
the fifth step: setting relative displacement speeds of the fixing seats 10 at the two ends according to requirements, driving the rubber strips to stretch by utilizing the movement of the fixing seats 10 at the two ends, locking the device through the self-locking mechanism 15 after reaching a set displacement distance each time, avoiding the change of the distance between the two fixing seats 10, and recording the stretching force at the moment;
and a sixth step: after the distance between the two fixed seats 10 is locked, the thicknesses of the front section, the middle section and the rear section of the rubber strip at the moment are measured in sequence through a thickness measuring mechanism 9, and the measured position information is recorded;
the seventh step: repeating the steps, and measuring a plurality of groups of tensile force, tensile length and thickness data of each section of the rubber strip to obtain a stress-strain curve of the rubber sample;
and finally: when the rubber strip breaks, the instantaneous stress value and the distance between the two fixed seats 10 when the rubber strip breaks are recorded, and the tensile strength value of the rubber sample is obtained.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. A rubber tensile test device comprises a base (1), wherein a supporting shell (14) is fixedly installed at the top of the base (1), a partition plate (12) is fixedly installed in the middle of the inner wall of the supporting shell (14), and the rubber tensile test device is characterized in that a test rotating shaft (4) is installed at the bottom end of the inner portion of the supporting shell (14) through a bearing, transmission chain wheels are fixedly installed at two ends of the test rotating shaft (4), threaded sleeves (6) are installed at the tops of two sides of the supporting shell (14) through bearings, the outer sides of the transmission chain wheels are in transmission connection with the threaded sleeves (6) through chains, a stepping motor (3) is fixedly installed at the top of the base (1), and transmission gears (2) which are meshed with each other are fixedly installed between an output shaft of the stepping motor (3) and the outer sides of the test rotating shaft (4);
the threaded screw rods (5) are respectively screwed in the two threaded sleeves (6), tension sensors (7) are respectively fixedly mounted at the ends, close to each other, of the two threaded screw rods (5), fixing seats (10) are respectively fixedly mounted at one sides, close to each other, of the two tension sensors (7), rubber fastening clamps (8) are respectively inserted in the two fixing seats (10), rectangular sliding rods (13) are fixedly mounted above the inner part of the supporting shell (14), and the bottoms of the two fixing seats (10) are respectively connected with the rectangular sliding rods (13) in a sliding manner;
the thickness measuring mechanism (9) is connected to the middle of the rectangular sliding rod (13) in a sliding mode, a mounting groove is formed in the top of the rectangular sliding rod (13), an electronic ruler is embedded in the mounting groove, a distance measuring sensor (17) matched with the electronic ruler is embedded in each of the thickness measuring mechanism (9) and the fixing seat (10), and a self-locking mechanism (15) is arranged between the partition plate (12) and the test rotating shaft (4);
rubber fastening anchor clamps (8) are including section for elastic splint (801) of V type structure, and the tip of elastic splint (801) is the arc structure, and the both sides inner wall edge of elastic splint (801) all is provided with press mark portion (804) of planar structure, and the side of press mark portion (804) is provided with a plurality of sections for tooth portion (803) of trapezium structure, and the top of elastic splint (801) is provided with handle portion (802).
2. The rubber tensile testing device of claim 1, wherein the fixed seat (10) comprises a seat body (1001) at the upper end, the top end of the seat body (1001) is provided with a slot part (1003) matched with the elastic clamping plate (801), the bottom end of the seat body (1001) is provided with a limit frame (1002) connected with the rectangular sliding rod (13) in a sliding manner, and the distance measuring sensor (17) is located inside the limit frame (1002).
3. The rubber tensile testing device of claim 1, wherein the thickness measuring mechanism (9) comprises a support frame (901) which is slidably connected with the rectangular sliding rod (13), a rectangular rod (902) is fixedly mounted at the top end of the support frame (901), a spring (903) and a movable frame (904) which are connected with each other are sleeved on the outer side of the rectangular rod (902), and thickness measuring components are arranged on two sides of the inner portion of the movable frame (904).
4. The rubber tensile testing device of claim 3, wherein the thickness measuring component comprises a displacement sensor (906) screwed on the inner side of the movable frame (904), one end of each of the two displacement sensors (906) close to each other is fixedly provided with a measuring roller (905), and the two measuring rollers (905) are in contact with each other and distributed on two sides of the axis of the fixed seat (10).
5. The rubber tensile testing device of claim 1, wherein the self-locking mechanism (15) comprises an electric push rod (1501) fixedly connected with the partition plate (12), a locking component is fixedly mounted at the end of the electric push rod (1501), the self-locking mechanism (15) further comprises a limit gear (1504) fixedly mounted on the outer side of the testing rotating shaft (4), and a plurality of limit groove portions matched with the locking component are arranged on the outer surface of the limit gear (1504).
6. A rubber tensile testing device according to claim 5, wherein the locking assembly comprises a locking plate (1503) with a trapezoidal structure, a telescopic member (1502) with a T-shaped section structure is fixedly installed on the outer side of the locking plate (1503), and a limiting sliding groove (16) which is connected with the top end of the telescopic member (1502) in a sliding manner is arranged at the bottom of the partition plate (12).
7. A rubber tensile testing device according to claim 1, wherein isolation covers (11) are fixedly mounted on both sides of the supporting shell (14), and the tail ends of the transmission chain wheel, the chain and the threaded screw rod (5) are positioned in the isolation covers (11).
8. A method for rubber tensile testing according to any of claims 1 to 7, characterized by comprising the steps of:
s1: the rubber tensile testing device is in signal connection with a computer, whether an electric signal in the testing device is connected or not is tested, and a fixed seat (10) in the computer control device is used for resetting;
s2: inserting two ends of the rubber strip cut into a strip shape or an I shape into the rubber fastening clamp (8), and inserting the rubber fastening clamp (8) into the fixed seat (10);
s3: the device drives two symmetrically distributed threaded screw rods (5) to move by means of a stepping motor (3), a transmission gear (2), a test rotating shaft (4) and a threaded sleeve (6), fixing seats (10) at two ends of a detection rubber strip and a rubber fastening clamp (8) are simultaneously pulled to move in opposite directions by the threaded screw rods (5) and a tension sensor (7), and after the rubber strip is fixed, the detection rubber strip in the middle is pulled to be stretched to straighten the rubber strip;
s4: recording the distance between the two fixed seats (10), recording the force values measured by the tension sensors (7) at the two ends, simultaneously sequentially measuring the thicknesses of the front section, the middle section and the rear section of the rubber strip by a thickness measuring mechanism (9), and recording the measured position information;
s5: setting relative displacement speeds of the fixing seats (10) at the two ends according to requirements, driving the rubber strips to stretch by utilizing the movement of the fixing seats (10) at the two ends, locking the device through a self-locking mechanism (15) after the set displacement distance is reached each time, avoiding the change of the distance between the two fixing seats (10), and recording the stretching force at the moment;
s6: after the distance between the two fixed seats (10) is locked, the thicknesses of the front section, the middle section and the rear section of the rubber strip at the moment are measured in sequence through a thickness measuring mechanism (9), and the measured position information is recorded;
s7: repeating the steps, and measuring a plurality of groups of tensile force, tensile length and thickness data of each section of the rubber strip to obtain a stress-strain curve of the rubber sample;
s8: when the rubber strip breaks, the instantaneous stress value and the distance between the two fixed seats (10) during the breaking are recorded, and the tensile strength value of the rubber sample is obtained.
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| CN114216781B (en) * | 2021-12-20 | 2022-10-14 | 连云港冠泰汽车配件有限公司 | Comparison type silicon rubber stretch-proofing performance detection device and method thereof |
| CN114323963A (en) * | 2021-12-28 | 2022-04-12 | 南京宁源塑胶科技有限公司 | Variable-temperature tension testing device for testing performance of cold-resistant and wear-resistant PA66 polymer |
| CN117969307B (en) * | 2024-04-01 | 2024-06-11 | 东北大学 | Intensity testing device for hard coating |
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