CN110044704B - Method for testing tensile strength of packaging carton - Google Patents
Method for testing tensile strength of packaging carton Download PDFInfo
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- CN110044704B CN110044704B CN201910392987.9A CN201910392987A CN110044704B CN 110044704 B CN110044704 B CN 110044704B CN 201910392987 A CN201910392987 A CN 201910392987A CN 110044704 B CN110044704 B CN 110044704B
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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
- G01N3/08—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
- 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
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0067—Fracture or rupture
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Abstract
The invention relates to a method for testing the tensile strength of a packaging carton, which comprises a bottom plate, a stretching device and a clamping device, wherein the upper end of the bottom plate is provided with the stretching device, the stretching device is symmetrically arranged on the bottom plate, and the clamping device is arranged at the upper end of the stretching device. The invention can solve the problems that the tensile force changes unevenly, the tensile test of the carton is inaccurate, the accuracy of the experiment is influenced, the clamping effect is poor when the end part of the carton is clamped, the packaging carton is easy to generate relative displacement with a clamping tool, the stress of the end part of the carton is easy to be uneven when the end part of the carton is clamped, the clamping part of the carton is damaged and the like, and has the advantages that the tensile strength of the packaging carton can be effectively and accurately tested by adopting the design concept of bidirectional stretching and different testing methods of variable tensile force and constant tensile force, and the like.
Description
Technical Field
The invention relates to the technical field of packaging cartons, in particular to a method for testing tensile strength of a packaging carton.
Background
The paper box is the most widely used packing product, and has various specifications and models, such as corrugated paper boxes, single-layer cardboard boxes and the like according to different materials. The packaging carton is usually made of paper products and is used for packaging various articles, and the packaging carton has the advantages of low cost, easy packaging, suitability for filling, cleanness and the like, and is suitable for product ex-factory packaging, article transportation, material arrangement and the like. Because the packaging carton is commonly used for transporting and protecting products, the packaging carton has higher requirements on the performances of compression resistance, tensile resistance, adhesive strength, puncture, simulated transportation shock resistance, falling and the like.
At present, when current packing carton is carrying out tensile strength test, there is following defect usually: 1. when the carton is stretched, the tension change is not uniform, the tensile test of the carton is not accurate, and the accuracy of the test is influenced; 2. when carrying out the centre gripping to the carton tip, the centre gripping is effectual poor, and relative displacement takes place with the centre gripping frock easily for the packing carton, and the easy atress of carton tip is uneven when carrying out the centre gripping moreover, causes the centre gripping position to take place to damage easily.
Disclosure of Invention
Technical problem to be solved
The invention can solve the problems that the tension change is not uniform, the tensile test of the carton is inaccurate, the accuracy of the experiment is influenced, the clamping effect is poor when the end part of the carton is clamped, the packaging carton is easy to generate relative displacement with a clamping tool, the stress of the end part of the carton is easy to be uneven when the end part of the carton is clamped, the clamping part of the carton is damaged, and the like when the end part of the carton is clamped.
(II) technical scheme
In order to achieve the purpose, the invention adopts the following technical scheme that the method for testing the tensile strength of the packaging carton comprises the following steps:
s1, completing the installation and positioning of the unfolded sample carton on the clamping tool;
s2, starting a stretching device, and stretching the sample carton in the step S1 in a mode of uniformly increasing the tensile force of the stretching device;
s3, starting a stretching device, and stretching the sample carton in the step S1 in a mode that the tension of the stretching device is constant;
and S4, manually observing and recording the breakage and rupture conditions of the tested cartons in the steps S2 and S3.
The working procedures of the packaging carton tensile strength testing method in the steps S1-S4 need to complete corresponding processing operations by the cooperation of the bottom plate, the stretching device and the clamping device.
The upper end of the bottom plate is provided with a stretching device, the stretching devices are symmetrically arranged on the bottom plate, and the upper end of the stretching device is provided with a clamping device.
The clamping device comprises a support frame, a limiting frame, a clamping tool and a buffer mechanism, wherein the support frame is of a rectangular hollow structure, the limiting frame is symmetrically arranged inside the support frame, the clamping tool is connected with the limiting frame in a sliding fit mode, and the buffer mechanism is symmetrically arranged at the outer end inside the support frame.
The clamping tool comprises a movable plate, a rotating seat, a rotating plate, clamping frames and locking branched chains, the outer side of the movable plate is connected with a limiting frame in a sliding fit mode, the rotating seat is installed on the left side of the upper end of the movable plate, the upper end of the rotating seat is connected with the lower end of the left side of the rotating plate, the clamping frames are installed on the right side of the rotating plate and the right side of the movable plate, the two clamping frames are symmetrically arranged, and the locking branched chains are symmetrically installed on the right end of the rotating plate.
Preferably, the stretching device include carriage, stretching cylinder, sliding plate and wire rope, bottom plate upper end symmetry install the carriage, the carriage cross-section is U type structure, the sliding plate is installed through sliding fit's mode to the carriage inside, install stretching cylinder between sliding plate lower extreme and the bottom plate, the sliding plate upper end evenly is provided with wire rope, wire rope one end is connected with the sliding plate, the wire rope other end is connected with clamping device.
Preferably, buffer gear include buffer board, slide bar and expanding spring, the support frame outside is provided with the slide bar, the slide bar is connected with the backup pad through sliding fit's mode, the buffer board is installed to the slide bar inboard, the buffer board medial surface is provided with the rubber pad, is provided with expanding spring on the slide bar that is located between backup pad and the buffer board.
Preferably, the locking branched chain comprises a rotating ring, a locking screw, a threaded seat and a locking seat, the rotating plate is provided with the threaded seat, the locking screw is installed inside the threaded seat in a thread fit mode, the rotating ring is installed at the upper end of the locking screw, and the moving plate is provided with the locking seat matched with the locking screw.
Preferably, the rotating seat include U type frame, fixed axle, rotation sleeve and reset torsion spring, U type frame install in the movable plate upper end outside, U type frame internally mounted has the fixed axle, the fixed axle evenly is provided with the rotation sleeve through sliding fit's mode, the rotation sleeve upper end is connected with the rotor plate, install the reset torsion spring on the fixed axle between the adjacent rotation sleeve.
Preferably, the chucking frame include joint plate, antiskid tooth and cushion, the joint plate cross-section be the right trapezoid structure, evenly install the antiskid tooth on the inclined plane of joint plate, the cushion is installed to the joint plate inboard, evenly be provided with the friction arch on the cushion.
Preferably, the fixed plate is symmetrically installed in the support frame, the upper end of the fixed plate is uniformly provided with a concave groove, balls are uniformly installed in the concave groove, and the lower end of the clamping tool is located at the upper end of the balls.
Preferably, the locking seat is internally provided with threads matched with the locking screw, and the lower end of the locking seat is arranged on the movable plate through a hinged support.
Preferably, the section of each anti-skidding tooth is of a right-angled triangle structure, and the right-angled edges of the anti-skidding teeth are perpendicular to the inclined surface of the clamping plate.
(III) advantageous effects
1. According to the method for testing the tensile strength of the packaging carton, the design concept of biaxial tension is adopted, and the tensile strength of the packaging carton can be effectively and accurately tested by different testing methods of variable tension and constant tension;
2. according to the clamping device provided by the invention, the clamping tool can accurately clamp and fix the edge of the packaging carton, so that the relative displacement of the packaging carton during the tensile test can be avoided, meanwhile, the clamping part of the packaging carton can be prevented from being broken, and the accuracy of the test experiment is ensured.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic perspective view of the bottom plate, stretching unit and clamping unit of the present invention;
FIG. 2 is a schematic perspective view of the clamping device of the present invention;
FIG. 3 is a schematic structural view of the clamping fixture of the present invention;
FIG. 4 is a schematic cross-sectional view of FIG. 3 in accordance with the present invention;
fig. 5 is a schematic view of the use state of the clamping device of the invention.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.
As shown in fig. 1 to 5, a method for testing tensile strength of a packaging carton comprises the following steps:
s1, completing the installation and positioning of the unfolded sample carton on the clamping tool 33;
s2, starting the stretching device 2, and stretching the sample carton in the step S1 in a mode of uniformly increasing the tension of the stretching device 2;
s3, starting the stretching device 2, and stretching the sample carton in the step S1 in a mode that the tension of the stretching device 2 is constant;
and S4, manually observing and recording the breakage and rupture conditions of the tested cartons in the steps S2 and S3.
The working procedures of the packaging carton tensile strength testing method in the steps of S1-S4 need to complete corresponding processing operations by the cooperation of the bottom plate 1, the stretching device 2 and the clamping device 3.
The upper end of the bottom plate 1 is provided with a stretching device 2, the stretching devices 2 are symmetrically arranged on the bottom plate 1, and the upper end of the stretching device 2 is provided with a clamping device 3.
The stretching device 2 comprises a sliding frame 21, a stretching cylinder 22, a sliding plate 23 and a steel wire rope 24, the sliding frame 21 is symmetrically installed at the upper end of the bottom plate 1, the cross section of the sliding frame 21 is of a U-shaped structure, the sliding plate 23 is installed inside the sliding frame 21 in a sliding fit mode, the stretching cylinder 22 is installed between the lower end of the sliding plate 23 and the bottom plate 1, the steel wire rope 24 is evenly arranged at the upper end of the sliding plate 23, one end of the steel wire rope 24 is connected with the sliding plate 23, the other end of the steel wire rope 24 is connected with the clamping device 3, and when the stretching device works, the stretching cylinder 22 applies evenly increased tension or constant tension to the clamping tool 33 through the steel wire rope 24.
Clamping device 3 include support frame 31, spacing 32, centre gripping frock 33 and buffer gear 34, support frame 31 be rectangle hollow structure, spacing 32 is installed to support frame 31 internal symmetry, support frame 31 internal symmetry is provided with centre gripping frock 33, centre gripping frock 33 is connected with spacing 32 through sliding fit's mode, buffer gear 34 is installed to support frame 31 internal outer end symmetry, the during operation has, centre gripping frock 33 can carry out the centre gripping to packing carton tip fixedly, buffer gear 34 can avoid centre gripping frock 33 and support frame 31 to take place direct collision.
The fixing plate 311 is symmetrically arranged in the supporting frame 31, the upper end of the fixing plate 311 is uniformly provided with the concave groove 312, the ball 313 is uniformly arranged in the concave groove 312, the lower end of the clamping tool 33 is located at the upper end of the ball 313, and when the clamping tool works, the ball 313 can effectively reduce friction between the clamping tool 33 and the fixing plate 311, so that the accuracy of a tensile test is guaranteed.
The clamping tool 33 comprises a moving plate 331, a rotating seat 332, a rotating plate 333, clamping frames 334 and locking branched chains 335, the outer side of the moving plate 331 is connected with a limiting frame 32 in a sliding fit mode, the rotating seat 332 is installed on the left side of the upper end of the moving plate 331, the upper end of the rotating seat 332 is connected with the lower end of the left side of the rotating plate 333, the clamping frames 334 are installed on the right side of the rotating plate 333 and the right side of the moving plate 331, the two clamping frames 334 are symmetrically arranged, the locking branched chains 335 are symmetrically installed at the right end of the rotating plate 333, when the clamping tool works, the rotating plate 333 is pressed in a manual mode, the rotating plate 333 is upwards opened through the rotating seat 332, the clamping frames 334 can effectively clamp and fix the end of the carton, and the locking branched chains 335 can prevent the end of the carton from relative displacement.
The rotating seat 332 comprises a U-shaped frame 321, a fixing shaft 322, rotating sleeves 323 and a reset torsion spring 324, the U-shaped frame 321 is installed on the outer side of the upper end of the moving plate 331, the fixing shaft 322 is installed inside the U-shaped frame 321, the fixing shaft 322 is evenly provided with the rotating sleeves 323 in a sliding fit mode, the upper end of each rotating sleeve 323 is connected with the rotating plate 333, and the reset torsion spring 324 is installed on the fixing shaft 322 between every two adjacent rotating sleeves 323.
The section of the anti-slip teeth 302 is of a right-angled triangle structure, and the right-angled edges of the anti-slip teeth 302 are perpendicular to the inclined surface of the clamping plate 301.
The locking branched chain 335 comprises a rotating ring 351, a locking screw 352, a thread seat 353 and a locking seat 354, the thread seat 353 is arranged on the rotating plate 333, the locking screw 352 is arranged in the thread seat 353 in a thread fit mode, the rotating ring 351 is arranged at the upper end of the locking screw 352, the locking seat 354 matched with the locking screw 352 is arranged on the moving plate 331, and when the locking branched chain works, the rotating ring 351 is connected with the locking seat 354 through the locking screw 352, so that the connection tightness of the two clamping frames 334 is ensured.
The locking seat 354 is internally provided with threads matched with the locking screw 352, and the lower end of the locking seat 354 is mounted on the moving plate 331 through a hinged support.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Industrial applicability
As mentioned above, the packaging carton tensile strength testing method provided by the invention adopts the design concept of biaxial tension, and can effectively and accurately test the tensile strength of the packaging carton through different testing methods of variable tension and constant tension; the clamping fixture can accurately clamp and fix the edges of the packaging cartons, can avoid relative displacement of the packaging cartons when the packaging cartons are subjected to tensile test, and can prevent the clamping part of the packaging cartons from being broken, thereby ensuring the accuracy of test experiments.
Claims (5)
1. The method for testing the tensile strength of the packaging carton is characterized by comprising the following steps: the method for testing the tensile strength of the packaging carton comprises the following steps:
s1, completing the installation and positioning of the unfolded sample carton on the clamping tool (33);
s2, starting the stretching device (2), and stretching the sample carton in the step S1 in a mode of uniformly increasing the tension of the stretching device (2);
s3, starting a stretching device (2), and stretching the sample carton in the step S1 in a mode that the tension of the stretching device (2) is constant;
s4, manually observing and recording the breakage and rupture conditions of the test cartons in the steps S2 and S3;
the working procedure of the packaging carton tensile strength testing method in the steps of S1-S4 needs to complete corresponding processing operation by the cooperation of the bottom plate (1), the stretching device (2) and the clamping device (3), wherein:
the upper end of the bottom plate (1) is provided with a stretching device (2), the stretching devices (2) are symmetrically arranged on the bottom plate (1), and the upper end of the stretching device (2) is provided with a clamping device (3);
the clamping device (3) comprises a support frame (31), a limiting frame (32), clamping tools (33) and buffer mechanisms (34), wherein the support frame (31) is of a rectangular hollow structure, the limiting frame (32) is symmetrically arranged in the support frame (31), the clamping tools (33) are connected with the limiting frame (32) in a sliding fit mode, and the buffer mechanisms (34) are symmetrically arranged at the outer end in the support frame (31);
the clamping tool (33) comprises a moving plate (331), a rotating seat (332), a rotating plate (333), clamping frames (334) and locking branched chains (335), wherein the outer side of the moving plate (331) is connected with a limiting frame (32) in a sliding fit mode, the rotating seat (332) is installed on the left side of the upper end of the moving plate (331), the upper end of the rotating seat (332) is connected with the lower end of the left side of the rotating plate (333), the clamping frames (334) are installed on the right side of the rotating plate (333) and the right side of the moving plate (331), the two clamping frames (334) are symmetrically arranged, and the locking branched chains (335) are symmetrically installed at the right end of the rotating plate (333);
the stretching device (2) comprises a sliding frame (21), a stretching cylinder (22), a sliding plate (23) and a steel wire rope (24), wherein the sliding frame (21) is symmetrically installed at the upper end of the bottom plate (1), the section of the sliding frame (21) is of a U-shaped structure, the sliding plate (23) is installed inside the sliding frame (21) in a sliding fit mode, the stretching cylinder (22) is installed between the lower end of the sliding plate (23) and the bottom plate (1), the steel wire rope (24) is uniformly arranged at the upper end of the sliding plate (23), one end of the steel wire rope (24) is connected with the sliding plate (23), and the other end of the steel wire rope (24) is connected with the clamping device (3);
the buffer mechanism (34) comprises a buffer plate (341), a sliding rod (342) and a telescopic spring (343), the sliding rod (342) is arranged on the outer side of the support frame, the sliding rod (342) is connected with the support plate in a sliding fit mode, the buffer plate (341) is installed on the inner side of the sliding rod (342), a rubber pad is arranged on the inner side of the buffer plate (341), and the telescopic spring (343) is arranged on the sliding rod (342) between the support plate and the buffer plate (341);
the locking branched chain (335) comprises a rotating ring (351), a locking screw rod (352), a thread seat (353) and a locking seat (354), the thread seat (353) is arranged on the rotating plate (333), the locking screw rod (352) is installed inside the thread seat (353) in a thread matching mode, the rotating ring (351) is installed at the upper end of the locking screw rod (352), and the locking seat (354) matched with the locking screw rod (352) is arranged on the moving plate (331);
fixed plate (311) are symmetrically installed in support frame (31), fixed plate (311) upper end evenly is provided with concave groove (312), ball (313) are evenly installed in concave groove (312), centre gripping frock (33) lower extreme is located ball (313) upper end.
2. The method for testing the tensile strength of the packaging carton according to claim 1, wherein the method comprises the following steps: the rotating seat (332) comprises a U-shaped frame (321), a fixing shaft (322), a rotating sleeve (323) and a reset torsion spring (324), the U-shaped frame (321) is installed on the outer side of the upper end of the moving plate (331), the fixing shaft (322) is installed inside the U-shaped frame (321), the rotating sleeve (323) is evenly arranged on the fixing shaft (322) in a sliding fit mode, the upper end of the rotating sleeve (323) is connected with the rotating plate (333), and the reset torsion spring (324) is installed on the fixing shaft (322) between the adjacent rotating sleeves (323).
3. The method for testing the tensile strength of the packaging carton according to claim 1, wherein the method comprises the following steps: chucking frame (334) including joint plate (301), antiskid tooth (302) and cushion (303), joint plate (301) cross-section be the right trapezoid structure, evenly install antiskid tooth (302) on the inclined plane of joint plate (301), cushion (303) are installed to joint plate (301) inboard, evenly be provided with the friction arch on cushion (303).
4. The method for testing the tensile strength of the packaging carton according to claim 1, wherein the method comprises the following steps: the locking seat (354) is internally provided with threads matched with the locking screw (352), and the lower end of the locking seat (354) is installed on the movable plate (331) through a hinged support.
5. The method for testing the tensile strength of the packaging carton according to claim 3, wherein the method comprises the following steps: the section of the anti-skidding tooth (302) is of a right-angled triangle structure, and the right-angled edge of the anti-skidding tooth (302) is perpendicular to the inclined surface of the clamping plate (301).
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| CN201910392987.9A CN110044704B (en) | 2019-05-13 | 2019-05-13 | Method for testing tensile strength of packaging carton |
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| CN201910392987.9A CN110044704B (en) | 2019-05-13 | 2019-05-13 | Method for testing tensile strength of packaging carton |
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| CN110044704B true CN110044704B (en) | 2021-07-23 |
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| CN112857983A (en) * | 2021-01-06 | 2021-05-28 | 镇江市产品质量监督检验中心 | Clamp for tensile test |
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| CN116698596B (en) * | 2023-08-07 | 2023-10-20 | 长沙双江包装有限公司 | Intensity testing device after corrugated board production molding |
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| CN110044704A (en) | 2019-07-23 |
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