CN106885730B - Multi-angle tearing test fixture and method for hemp fibers - Google Patents
Multi-angle tearing test fixture and method for hemp fibers Download PDFInfo
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- CN106885730B CN106885730B CN201710231088.1A CN201710231088A CN106885730B CN 106885730 B CN106885730 B CN 106885730B CN 201710231088 A CN201710231088 A CN 201710231088A CN 106885730 B CN106885730 B CN 106885730B
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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
- 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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- 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
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- G—PHYSICS
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- 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
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
- G01N2203/0423—Chucks, fixtures, jaws, holders or anvils using screws
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention discloses a multi-angle tearing test fixture for hemp fibers and a test method, wherein the test fixture comprises a base, a sliding table and a sliding rail, the sliding table is arranged on the base through an angle adjusting mechanism, the sliding rail is arranged on the sliding table in a sliding manner, a fixing component for fixing hemp stems is arranged on the sliding rail, and the test fixture further comprises a sliding driving component for driving the sliding rail to slide. The testing method mainly comprises the steps of fixing hemp stalks on a testing fixture, carrying out tearing test by using a mechanical testing machine, and enabling the included angle between the hemp fibers and the stalks which are vertically torn upwards to be unchanged by adjusting the sliding speed of a sliding rail on a sliding table in the testing process, so that the tearing angle of the hemp fibers in the tearing process is ensured to be constant. The invention can ensure the constant tearing angle in the tearing process, can set different tearing angles, realizes multi-angle tearing, and provides technical basis for the research and development of the whole-bone type hemp fiber stripping machine.
Description
Technical Field
The invention relates to the technical field of peeling harvesting machinery, in particular to a multi-angle tearing test fixture and a multi-angle tearing test method for hemp fibers, which are suitable for multi-angle tearing force measurement.
Background
The total industrial economic quantity of the hemp industry in China exceeds 1100 hundred million yuan, wherein the agricultural yield is about 400 hundred million yuan, the industrial yield is about 700 hundred million yuan, the planting area and the yield respectively account for 3.3 percent and 8.3 percent of the planting area and the yield of special economic crops in China, and the annual export of the hemp products creates 20 hundred million dollars of foreign exchange. In recent years, with the increasing exhaustion of petrochemical resources, hemp fibers are popular with consumers due to excellent characteristics such as ecology and environmental protection, the demand of the hemp fibers is increased year by year, and the annual speed of the global natural fibers is increased by 8%, so that China is 15%. However, the development potential and space of the hemp industry in China are far from fully explored. The rapid development of modern technology will bring out a huge new hemp industry and will become a brand new economic growth point in 21 st century in China.
Fibrilia has the characteristics of low cost, light weight, natural degradation, high specific strength and specific modulus and the like, and is widely applied to the preparation of fiber reinforced composite materials. The environment-friendly bast fiber mulching film developed by taking bast fiber as a main raw material and adopting a non-woven fabric manufacturing process and a special post-treatment process has the advantages of high strength, good heat preservation and moisture preservation effects, capability of effectively promoting the growth and development of crops, good degradation performance in soil after use, no pollution and soil fertility improvement.
However, most existing hemp fiber stripping machines in the market are broken bone stripping machines, and have the defects of high stripping difficulty, more impurities such as hemp bones, hemp scraps, colloid and the like in the obtained hemp fibers, and the development of mechanical stripping of the hemp fibers in China is restricted. The hemp integral type mechanical harvesting in China is in the stage of just starting, the existing integral type peeling machine in the market at present cannot meet the requirements of hemp peeling, and the tearing performance of hemp stalk bast fibers needs to be measured so as to provide technical basis for the research and development of the integral type hemp peeling machine.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a multi-angle tearing test clamp for the hemp fibers, which has the advantages of simple structure, easiness in manufacturing, low cost, high efficiency in working, stability and reliability, and a method for carrying out tearing test by using the multi-angle tearing test clamp for the hemp fibers.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides a test fixture is torn to bast fiber multi-angle, includes base, slip table and slide rail, the slip table passes through angle adjustment mechanism and installs on the base, the slide rail slides and locates on the slip table, install the fixed subassembly that is used for fixed bast stalk on the slide rail, test fixture is still including being used for driving the gliding slip drive assembly of slide rail.
The multi-angle tearing test fixture for the hemp fibers is preferable, the fixing assembly comprises a first positioning hole and a second positioning hole, the first positioning hole and the second positioning hole can be used for allowing hemp stems to pass through, the first positioning hole and the second positioning hole are arranged at intervals along the sliding direction of the sliding rail, and the fixing assembly further comprises an adjustable fixing piece capable of fixing the hemp stems in the first positioning hole or loosening the hemp stems.
According to the multi-angle tearing test fixture for the hemp fibers, preferably, the sliding rail is provided with the accommodating groove for accommodating the hemp stems.
According to the multi-angle tearing test fixture for the hemp fibers, preferably, the sliding rail is fixedly connected with the first fixing block and the second fixing block, the first positioning hole is formed in the first fixing block, the adjustable fixing piece is a fastening screw which is installed on the first fixing block in a threaded fit manner, the second fixing block stretches across the opening end of the accommodating groove, the second fixing block is provided with the groove, and the groove and the accommodating groove are combined to form the second positioning hole; and a positioning part for positioning one end of the hemp stalk inserted into the second positioning hole is arranged on the second fixing block or the sliding rail.
The multi-angle tearing test fixture for the hemp fibers comprises a base, wherein the lower end of the fixing support rod is fixedly connected to the base, the upper end of the fixing support rod is hinged to a sliding rail, the adjustable support rod comprises a sleeve and a sliding rod sleeved in the sleeve, the sleeve is fixedly connected to the base, a sliding groove is formed in the sliding rail, the sliding rod is arranged on the hinged piece in the sliding groove in a sliding mode and is connected with the sliding groove, and an adjusting component used for adjusting the sliding position of the fixing sliding rod is arranged between the sliding rod and the sleeve.
The multi-angle tearing test fixture for the hemp fibers is characterized in that the adjusting assembly comprises a bolt, a first jack arranged on the wall of the sleeve barrel and a plurality of second jacks arranged on the sliding rod, wherein the second jacks are arranged at intervals along the sliding rod, and the bolt is inserted into the first jack and any one of the second jacks.
According to the multi-angle tearing test fixture for the hemp fibers, preferably, the sliding driving assembly comprises the rack installed on the sliding rail, the rotary driving piece installed on the sliding table and the gear connected with the driving end of the rotary driving piece, and the gear is meshed with the rack.
The multi-angle tearing test fixture for the hemp fibers is preferable, a guide pulley used for guiding the tearing direction of the hemp fibers is arranged on the sliding table, the guide pulley is arranged on the sliding rail in a manner of adjusting displacement along the direction of the sliding table through a displacement adjusting assembly, the displacement adjusting assembly comprises two mounting seats fixedly arranged on the sliding rail, each mounting seat is provided with a sliding hole arranged along the sliding direction of the sliding table, two ends of a rotating shaft of the guide pulley are respectively arranged in the sliding holes of the two mounting seats in a sliding mode, and friction force for preventing the rotating shaft from sliding is arranged between the rotating shaft and the sliding holes.
According to the multi-angle tearing test fixture for the hemp fibers, preferably, the base comprises a bottom plate and the connecting cylinders fixedly connected to the bottom plate, and through holes penetrating through the cylinder walls of the two opposite sides of the connecting cylinders are formed in the connecting cylinders.
A test method for carrying out a tearing test by adopting the multi-angle tearing test clamp for the hemp fiber comprises the following steps:
(A) Mounting a base of a multi-angle tearing test fixture for the hemp fibers on an objective table of a mechanical testing machine, fixing hemp stems on a sliding rail through a fixing component, clamping part of the hemp fibers which are torn in advance on an upper clamping head of the mechanical testing machine, and finally adjusting an included angle between the sliding direction of the sliding rail and the base to a test set angle through an angle adjusting mechanism;
(B) The mechanical testing machine and the rotary driving assembly are started, so that the upper chuck of the mechanical testing machine moves vertically upwards to load, the rotary driving assembly drives the sliding rail to move in the opposite direction of the hemp stalk tearing direction, and the speed of the vertical upwards movement of the upper chuck is equal to the sliding speed of the sliding rail. Thereby ensuring that the included angle between the hemp fiber and the hemp stalk which are torn along with the vertical upward movement of the chuck on the mechanical experiment machine is unchanged, and ensuring the constant tearing angle in the experiment process; different sliding table dip angles can be set through changing the angle adjusting mechanism, and multi-angle tearing is realized.
Compared with the prior art, the invention has the advantages that: according to the multi-angle tearing test fixture and the multi-angle tearing test method for the hemp fibers, when the tearing test is carried out, the base is arranged on the objective table of the mechanical testing machine, the hemp stalks are fixed on the sliding rail, a part of the hemp fibers which are torn in advance are clamped on the upper clamping head of the mechanical testing machine, the sliding driving assembly drives the sliding rail to correspondingly move when the upper clamping head moves upwards to load the hemp fibers, and the sliding speed of the sliding rail is adjusted to be equal to the upward movement speed of the upper clamping head, so that the included angle between the hemp fibers which are torn along with the vertical upward movement of the upper clamping head of the mechanical testing machine and the hemp stalks is unchanged, and the tearing angle of the hemp fibers can be ensured to be unchanged. Meanwhile, the included angle between the sliding direction of the sliding rail and the base is adjusted through the angle adjusting mechanism, the tearing angle of the hemp fiber can be adjusted, the tearing angle adjustable range is 90-180 degrees, and the requirements of different tearing angle tests can be met. The multi-angle tearing test fixture for the hemp fibers has the advantages of simple structure, easiness in manufacturing and low cost, can efficiently and highly-effectively finish the multi-angle tearing test of the hemp fibers, and provides technical basis for the research and development of the peeling machine for the whole-bone hemp crops.
Drawings
Fig. 1 is a schematic perspective view of a multi-angle tear test fixture for hemp fibers.
Fig. 2 is a schematic diagram of a front view structure of a multi-angle tear test jig for hemp fibers.
Fig. 3 is a schematic rear view of the sliding table.
Fig. 4 is a schematic bottom view of the slide rail.
Legend description:
1. a base; 11. a bottom plate; 12. a connecting cylinder; 121. a through hole; 2. a sliding table; 3. a slide rail; 31. the accommodating groove; 32. a chute; 4. a fixing assembly; 41. a first positioning hole; 42. a second positioning hole; 43. a first fixed block; 44. a second fixed block; 45. a fastening screw; 5. fixing the support rod; 6. an adjustable strut; 61. a sleeve; 62. a slide bar; 63. a plug pin; 64. a first jack; 65. a second jack; 7. a rack; 8. a rotary driving member; 9. a gear; 10. a guide pulley; 20. a slip hole; 30. a rotating shaft.
Detailed Description
The invention is described in further detail below with reference to the drawings and the specific examples.
As shown in fig. 1 and 2, the multi-angle tearing test fixture for hemp fibers of the embodiment comprises a base 1, a sliding table 2 and a sliding rail 3, wherein the sliding table 2 is arranged on the base 1 through an angle adjusting mechanism, the sliding rail 3 is arranged on the sliding table 2 in a sliding manner, the angle between the sliding table 2 and the base 1 can be adjusted by the angle adjusting mechanism, the sliding direction of the sliding rail 3 and the included angle between the base 1 are adjusted, a fixing assembly 4 for fixing hemp stalks is arranged on the sliding rail 3, and the test fixture further comprises a sliding driving assembly for driving the sliding rail 3 to slide.
When carrying out tearing test, install base 1 on the objective table of mechanical testing machine, hemp stalk is fixed on slide rail 3, with partly in advance tearing hemp fibre centre gripping on mechanical testing machine's last chuck, drive slide rail 3 corresponding movement through the slip drive assembly when last chuck upward movement carries out the loading, the slip speed through adjusting slide rail 3 equals with last chuck upward movement's speed for the contained angle between hemp fibre and the hemp stalk that carries out tearing along with the vertical upward movement of chuck on the mechanical testing machine is unchangeable, can guarantee that hemp fibre tear angle is unchangeable. Meanwhile, the included angle between the sliding direction of the sliding rail 3 and the base 1 is adjusted through the angle adjusting mechanism, the tearing angle of the hemp fiber can be adjusted, the tearing angle adjustable range is 90-180 degrees, and the requirements of different tearing angle tests can be met. The multi-angle tearing test fixture for the hemp fibers has the advantages of simple structure, easiness in manufacturing and low cost, can efficiently and highly-effectively finish the multi-angle tearing test of the hemp fibers, and provides technical basis for the research and development of the peeling machine for the whole-bone hemp crops.
In this embodiment, the fixing component 4 includes a first positioning hole 41 and a second positioning hole 42 through which the hemp stalks can pass, the first positioning hole 41 and the second positioning hole 42 are arranged at intervals along the sliding direction of the sliding rail 3, the same hemp stalk can be simultaneously inserted into the first positioning hole 41 and the second positioning hole 42, and the fixing component 4 further includes an adjustable fixing piece capable of fixing the hemp stalk in the first positioning hole 41 or loosening the hemp stalk. The fixing component 4 in the structure has the advantages of simple structure, convenient operation and stable and reliable fixing.
In this embodiment, the slide rail 3 is provided with a receiving groove 31 for receiving the hemp stalk. Because the hemp stalk is the irregular cylinder, when slide rail 3 design is smooth plane, the contact area of hemp stalk and slide rail 3 surface is too little, is unfavorable for hemp stalk's fixed. In this embodiment, the accommodating groove 31 is formed on the sliding rail 3, and the hemp stalks are accommodated in the accommodating groove 31, so that the contact area between the hemp stalks and the sliding rail 3 is increased, and the accommodating groove 31 plays a role in positioning the hemp stalks, so that the displacement of the hemp stalks is reduced to the greatest extent. The accommodating groove 31 is matched with the fixing component 4 for use, so that the stable and reliable limiting and fixing effects can be achieved, and experimental data errors caused by stem sliding in the experimental process can be eliminated.
In this embodiment, as shown in fig. 1 to 3, a first fixing block 43 and a second fixing block 44 are fixedly connected to the sliding rail 3, the first positioning hole 41 is formed in the first fixing block 43, the adjustable fixing member is a fastening screw 45 mounted on the first fixing block 43 in a threaded fit manner, the second fixing block 44 spans the opening end of the accommodating groove 31, the second fixing block 44 is provided with a groove, and the groove and the accommodating groove 31 are combined to form the second positioning hole 42. The first positioning hole 41 and the second positioning hole 42 are formed by adopting the structure, so that the compactness of the structure can be improved, and the manufacturing difficulty and the manufacturing cost can be reduced. The first positioning hole 41 is a circular hole, and the aperture of the first positioning hole is slightly larger than that of the hemp stalk; the groove and the accommodating groove 31 are semicircular grooves, and are matched to form a circular second positioning hole 42, and the aperture of the second positioning hole 42 is slightly larger than that of the hemp stalk.
Preferably, in this embodiment, the positioning component for positioning the end of the hemp stalk inserted into the second positioning hole 42 is disposed on the second fixing block 44, when the hemp stalk is fixed in installation, one end of the hemp stalk is inserted into the second positioning hole 42 through the first positioning hole 41, and the end of the hemp stalk inserted into the second positioning hole 42 is abutted against the positioning component to form positioning, so that installation and fixation of the hemp stalk are greatly facilitated, and the test efficiency is improved. Specifically, the positioning member is integrally connected to the second fixing block 44, and is located at one end of the groove of the second fixing block 44. In other embodiments, the positioning means may also be provided on the sliding rail 3.
In this embodiment, the angle adjustment mechanism includes a fixed supporting rod 5 and an adjustable supporting rod 6, the lower end of the fixed supporting rod 5 is fixedly connected to the base 1, the upper end of the fixed supporting rod 5 is hinged to the sliding rail 3, the adjustable supporting rod 6 includes a sleeve 61 and a sliding rod 62 slidably sleeved in the sleeve 61, the sleeve 61 is fixedly connected to the base 1, the sliding rail 3 is provided with a sliding groove 32, the sliding rod 62 is connected with the sliding groove 32 through a hinge piece slidably arranged in the sliding groove 32, the sliding rod 62 can slide along the sliding groove 32 and can rotate around the axis of the hinge piece, and an adjustment component for adjusting the sliding position of the fixed sliding rod 62 is arranged between the sliding rod 62 and the sleeve 61. The inclination angle of the sliding table 2 is adjusted by adjusting the sliding position of the sliding rod 62 in the sleeve 61, namely, the whole length of the adjustable supporting rod 6.
In this embodiment, the adjusting component includes a plug 63, a first jack 64 disposed on the wall of the sleeve 61, and a plurality of second jacks 65 disposed on the slide rod 62, where the plurality of second jacks 65 are disposed at intervals along the slide rod 62, and the plug 63 is inserted into the first jack 64 and any one of the second jacks 65. When the bolt 63 is inserted into the second insertion holes 65, the sliding positions of the sliding rod 62 in the sleeve 61 are different, that is, the overall lengths of the adjustable support rods 6 are different, so that the inclination angle of the sliding table 2 is adjusted. Preferably, the first insertion hole 64 penetrates through opposite side walls of the sleeve 61, and the second insertion hole 65 penetrates through the slide bar 62, so that the latch 63 can penetrate through the slide bar 62 from one side of the sleeve 61 to the other side of the sleeve 61, and connection stability between the slide bar 62 and the sleeve 61 can be ensured.
In other embodiments, the angle adjusting mechanism may also adopt a stepless adjusting structure, for example, the angle adjusting mechanism of the present embodiment may realize stepless adjustment only by changing an adjusting component, specifically, the adjusting component is modified to adopt only one screw that is mounted on the sleeve 61 in a threaded fit, and the outer wall of the slide rod 62 is pressed or loosened by screwing the screw, so that the slide rod 62 may be fixed at any sliding position.
In this embodiment, as shown in fig. 1, 2 and 4, the sliding driving assembly includes a rack 7, a rotary driving member 8 and a gear 9, the rack 7 is mounted on the slide rail 3, the rotary driving member 8 is mounted on the slide table 2 through a connecting plate, the gear 9 is connected to the driving end of the rotary driving member 8, and the gear 9 is meshed with the rack 7. The rotary driving piece 8 adopts a speed regulating motor, and the speed regulating motor is matched with a mechanical driving structure of the gear 9 and the rack 7, so that a transmission system is greatly simplified, meanwhile, the vibration of a machine is reduced, the stability is increased, the energy consumption is low, the noise is low, meanwhile, the rotating speed of the speed regulating motor is adjustable, the sliding speed of the sliding rail 3 is also adjustable, and the conditions of different tearing speeds in a test can be met.
In this embodiment, be equipped with the guide pulley 10 that is used for guiding the direction of tearing of bast fiber on the slip table 2, guide pulley 10 passes through displacement adjustment subassembly and installs on slide rail 3 with the mode that can follow slip table 2 direction adjustment displacement, displacement adjustment subassembly is including setting firmly two mount pads on slide rail 3, each mount pad is equipped with the hole 20 that slides of arranging along slip table 2 slip direction, the pivot 30 both ends of guide pulley 10 are slided respectively and are located in the hole 20 that slides of two mount pads, have the frictional force that hinders pivot 30 slip between pivot 30 and the hole 20 that slides. During the test, the edge of the guide pulley 10 and the tearing point of the hemp fiber are positioned on the same vertical plane, the edge of the guide pulley 10 is propped against the outer side of the hemp fiber torn in advance, the guide pulley 10 plays a certain limiting role on the hemp fiber, and the deflection of the hemp fiber can be limited, so that the size of the tearing angle is unchanged. Because the tearing force of the hemp fiber is not large, the guide pulley 10 can be kept in position only by the friction force between the rotating shaft 30 and the sliding hole 20 without sliding, and when the position of the guide pulley 10 needs to be adjusted, the two ends of the rotating shaft 30 can be manually broken off by people, so that the guide pulley 10 can move along the sliding hole 20 under the action of the friction force.
In the test process, an internal included angle between the vertically upward tearing-apart hemp fibers and the hemp stalks (the sliding rail 3) is defined as a tearing angle, and the important point of the tearing test is how to ensure that the tearing angle is unchanged in the tearing process and the multi-angle tearing test can be carried out, so that the torn-apart hemp fibers are always along the vertical direction. However, in the test process, the hemp stalk is fixed in the accommodating groove 31, and the tear point may deviate, and at this time, by adjusting the position of the guide pulley 10, the edge of the guide pulley 10 and the tear point are in the same vertical direction, so that the test difficulty can be reduced, and the test efficiency is improved. The displacement adjusting assembly is simple in structure, convenient to adjust and easy to implement.
The mounting seat can be an iron plate with a sliding hole 20, when the mounting seat is mounted, one side of the iron plate is welded on the sliding rail 3, one end of the rotating shaft 30 is inserted into the sliding hole 20 of the iron plate, the other end of the rotating shaft is inserted into the sliding hole 20 of the other side of the iron plate, and then the other side of the iron plate is welded on the sliding rail 3.
In this embodiment, the base 1 includes a bottom plate 11 and a connecting cylinder 12 fixedly connected to the bottom plate 11, wherein the connecting cylinder 12 is provided with a through hole 121 penetrating through the cylinder walls of opposite sides of the connecting cylinder 12, and the through hole 121 penetrates through the cylinder walls of opposite sides of the connecting cylinder 12 and passes through the axis of the connecting cylinder 12. The through hole 121 is arranged on the connecting cylinder 12, so that the base 1 can be conveniently fixed on a mechanical testing machine, and the mechanical testing machine adopts the existing SANS-CMT6104 microcomputer control electronic universal mechanical testing machine in the embodiment.
In this embodiment, the sliding table 2 is provided with two sliding grooves with opposite openings, and two side edges of the sliding rail 3 are respectively and correspondingly slidably arranged in the two sliding grooves.
A test method for carrying out a tearing test by adopting the multi-angle tearing test clamp for the hemp fiber comprises the following steps:
(A) The base 1 of the multi-angle tearing test fixture for the hemp fibers is arranged on an objective table of a mechanical testing machine, hemp stems are fixed on a sliding rail 3 through a fixing component 4, the included angle (the inclination angle of a sliding table 2) between the sliding direction of the sliding rail 3 and the base 1 is adjusted through an angle adjusting mechanism, and then part of the hemp fibers which are torn in advance of the hemp stems are clamped on an upper clamping head of the mechanical testing machine after being guided by a guide piece (a guide pulley 10);
(B) The mechanical testing machine and the rotary driving assembly are started, so that the upper chuck of the mechanical testing machine moves vertically upwards to load, the rotary driving assembly drives the sliding rail 3 to move along with the hemp stalks in the opposite direction of tearing of the hemp fibers, and the speed of the vertical upwards movement of the upper chuck is equal to the sliding speed of the sliding rail 3, thereby ensuring that the included angle between the hemp fibers and the hemp stalks which are torn along with the vertical upwards movement of the upper chuck of the mechanical testing machine is unchanged, and ensuring the constant tearing angle in the test process; different inclination angles of the sliding table 2 can be set through changing the angle adjusting mechanism, so that multi-angle tearing is realized.
The hemp fiber multi-angle tearing test clamp of the embodiment is adopted for carrying out tearing test, and the method comprises the following steps: the loading speed of the mechanical testing machine and the rotating speed of the speed regulating motor are preset; fixing a hemp fiber multi-angle tearing test fixture on an objective table of a mechanical testing machine through a connecting cylinder 12 on a base 1, penetrating hemp stalks required by the test into a first positioning hole 41 until the hemp stalks reach and penetrate into a second positioning hole 42, and then tightening a fastening screw 45 to tightly press and fix the hemp stalks in the first positioning hole 41 to finish the fixation of the hemp stalks; at this time, the hemp stalk to be fixed is longer than the length required for the tearing test, and the actual tearing length is the distance between the first positioning hole 41 and the second positioning hole 42. Sliding the sliding rail 3 into a sliding groove of the sliding table 2, and clamping a part of pre-torn hemp fibers on an upper chuck of the mechanical testing machine after passing through the guide pulley 10; simultaneously, the power supplies of the mechanical testing machine and the speed regulating motor are started, the upper chuck of the mechanical testing machine is vertically and upwards loaded to drive the split hemp fibers to vertically and upwards move, the speed regulating motor drives the sliding rail 3 to drive the hemp stalks on the sliding rail to move in the opposite direction of the tearing of the hemp fibers, and the speed of the vertical and upwards movement of the upper chuck is equal to the sliding speed of the sliding rail 3 by setting the speed regulating motor and the mechanical testing machine in the tearing process, so that the tearing points of the hemp fibers are ensured to be fixed at the same position; at this time, the included angle between the hemp fiber and the sliding rail 3 is the tearing angle. By adjusting the length of the adjustable support rod 6, the inclination angle of the sliding table 2 relative to the base 1 can be changed, so that the hemp stalk tearing angle fixed on the sliding rail 3 can be adjusted.
The above description is merely a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above examples. Modifications and variations which would be obvious to those skilled in the art without departing from the spirit of the invention are also considered to be within the scope of the invention.
Claims (10)
1. The utility model provides a hemp type fibre multi-angle tear test anchor clamps which characterized in that: the testing fixture comprises a base (1), a sliding table (2) and a sliding rail (3), wherein the sliding table (2) is arranged on the base (1) through an angle adjusting mechanism, the sliding rail (3) is arranged on the sliding table (2) in a sliding mode, a fixing assembly (4) for fixing hemp stalks is arranged on the sliding rail (3), and the testing fixture further comprises a sliding driving assembly for driving the sliding rail (3) to slide; the part of the pre-torn hemp fiber is clamped on the upper clamping head of the mechanical testing machine, the upper clamping head moves upwards to load, the sliding driving assembly drives the sliding rail (3) to move correspondingly, and the sliding speed of the sliding rail (3) is adjusted to be equal to the upward movement speed of the upper clamping head.
2. The multi-angle tear test fixture for hemp fibers of claim 1, wherein: the fixing assembly (4) comprises a first positioning hole (41) and a second positioning hole (42) which can be used for allowing the hemp stalks to pass through, the first positioning hole (41) and the second positioning hole (42) are arranged at intervals along the sliding direction of the sliding rail (3), and the fixing assembly (4) further comprises an adjustable fixing piece which can fix the hemp stalks in the first positioning hole (41) or loosen the hemp stalks.
3. The multi-angle tear test fixture for hemp fibers of claim 2, wherein: the sliding rail (3) is provided with a containing groove (31) for containing hemp stalks.
4. A multi-angle tear test fixture for hemp fibers according to claim 3, characterized in that: the sliding rail (3) is fixedly connected with a first fixing block (43) and a second fixing block (44), the first positioning hole (41) is formed in the first fixing block (43), the adjustable fixing piece is a fastening screw (45) which is installed on the first fixing block (43) in a threaded fit manner, the second fixing block (44) stretches across the opening end of the accommodating groove (31), the second fixing block (44) is provided with a groove, and the groove and the accommodating groove (31) are combined to form the second positioning hole (42); and a positioning part for positioning one end of the hemp stalk inserted into the second positioning hole (42) is arranged on the second fixing block (44) or the sliding rail (3).
5. The multi-angle tear test fixture for hemp fibers of claim 1, wherein: the angle adjusting mechanism comprises a fixed supporting rod (5) and an adjustable supporting rod (6), wherein the lower end of the fixed supporting rod (5) is fixedly connected to a base (1), the upper end of the fixed supporting rod (5) is hinged to a sliding rail (3), the adjustable supporting rod (6) comprises a sleeve (61) and a sliding rod (62) sleeved in the sleeve (61) in a sliding manner, the sleeve (61) is fixedly connected to the base (1), a sliding groove (32) is formed in the sliding rail (3), the sliding rod (62) is connected with the sliding groove (32) through a hinge piece arranged in the sliding groove (32), and an adjusting component used for adjusting the sliding position of the fixed sliding rod (62) is arranged between the sliding rod (62) and the sleeve (61).
6. The multi-angle tear test fixture for hemp fibers of claim 5, wherein: the adjusting component comprises a bolt (63), a first jack (64) arranged on the wall of the sleeve (61) and a plurality of second jacks (65) arranged on the sliding rod (62), wherein the second jacks (65) are arranged at intervals along the sliding rod (62), and the bolt (63) is inserted into the first jack (64) and any one of the second jacks (65).
7. The multi-angle tear test fixture for hemp fibers of claim 1, wherein: the sliding driving assembly comprises a rack (7) arranged on the sliding rail (3), a rotary driving piece (8) arranged on the sliding table (2) and a gear (9) connected with the driving end of the rotary driving piece (8), and the gear (9) is meshed with the rack (7).
8. The multi-angle tear test fixture for hemp fibers according to any one of claims 1 to 7, characterized in that: be equipped with on slip table (2) and be used for guiding the guide pulley (10) of bast fiber tear direction, guide pulley (10) are installed on slide rail (3) through displacement adjustment subassembly in order to follow the mode of slip table (2) direction adjustment displacement, displacement adjustment subassembly is including setting firmly two mount pads on slide rail (3), and each mount pad is equipped with the sliding hole (20) of arranging along slip table (2) slip direction, in sliding hole (20) of two mount pads are located respectively to the pivot (30) both ends of guide pulley (10) slip, have the gliding frictional force of hindrance pivot (30) between pivot (30) and sliding hole (20).
9. The multi-angle tear test fixture for hemp fibers according to any one of claims 1 to 7, characterized in that: the base (1) comprises a bottom plate (11) and a connecting cylinder (12) fixedly connected to the bottom plate (11), and through holes (121) penetrating through cylinder walls on two opposite sides of the connecting cylinder (12) are formed in the connecting cylinder (12).
10. A method for performing a tear test using the multi-angle tear test fixture for hemp fibers of claim 1, comprising: the method comprises the following steps:
(A) The base (1) of the multi-angle tearing test fixture for the hemp fibers is arranged on an objective table of a mechanical testing machine, hemp stalks are fixed on a sliding rail (3) through a fixing component (4), part of the hemp fibers which are torn in advance are clamped on an upper clamping head of the mechanical testing machine, and finally the included angle between the sliding direction of the sliding rail (3) and the base (1) is adjusted to a test set angle through an angle adjusting mechanism;
(B) The mechanical testing machine and the rotary driving assembly are started, so that the upper chuck of the mechanical testing machine moves vertically upwards to load, the rotary driving assembly drives the sliding rail (3) to move in the opposite direction of the hemp stalk tearing direction, and the speed of the vertical upwards movement of the upper chuck is equal to the sliding speed of the sliding rail (3).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710231088.1A CN106885730B (en) | 2017-04-11 | 2017-04-11 | Multi-angle tearing test fixture and method for hemp fibers |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710231088.1A CN106885730B (en) | 2017-04-11 | 2017-04-11 | Multi-angle tearing test fixture and method for hemp fibers |
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| CN106885730A CN106885730A (en) | 2017-06-23 |
| CN106885730B true CN106885730B (en) | 2023-06-06 |
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| CN108194417A (en) * | 2017-12-27 | 2018-06-22 | 安徽森能电力设备有限公司 | It is a kind of to facilitate change in location to adjust the blower fan system of wind direction |
| CN108593547A (en) * | 2018-06-21 | 2018-09-28 | 宿松县恒鼎服饰有限公司 | A kind of multifunctional dress quality detection device |
| CN111238959A (en) * | 2020-02-27 | 2020-06-05 | 黄山学院 | Bending property testing device of material |
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| US6840421B2 (en) * | 2001-12-07 | 2005-01-11 | Hewlett-Packard Development Company, Lp. | Tearing tool |
| US7004040B2 (en) * | 2003-12-18 | 2006-02-28 | Avery Weigh-Tronix, Llc | Support structure for a load-bearing device |
| JP4862714B2 (en) * | 2007-03-23 | 2012-01-25 | トヨタ車体株式会社 | Peeling device |
| CN201689019U (en) * | 2010-04-15 | 2010-12-29 | 美特斯工业系统（中国）有限公司 | Drop-hammer tear tester with manipulator |
| CN202614662U (en) * | 2012-06-26 | 2012-12-19 | 湖南农业大学 | Rape stalk connecting force measuring clamp |
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