CN212432847U - Impact tester for coarse aggregate - Google Patents
Impact tester for coarse aggregate Download PDFInfo
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- CN212432847U CN212432847U CN202021141132.3U CN202021141132U CN212432847U CN 212432847 U CN212432847 U CN 212432847U CN 202021141132 U CN202021141132 U CN 202021141132U CN 212432847 U CN212432847 U CN 212432847U
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Abstract
The utility model discloses a coarse aggregate impact tester, which comprises a base module, a bracket module and an impact module; the base module comprises a steel chassis, a rubber buffer layer is fixed on the upper surface of the steel chassis, and an impact barrel positioning groove is further formed in the circle center of the upper surface of the cast iron base; the device also comprises an impact cylinder; the support module comprises two guide rods, and the top ends of the guide rods are connected through a framework cross beam clamped between two pairs of positioning nuts; the middle part of the framework cross beam is also provided with a through hole, and a positioning bolt is movably arranged in the through hole; the impact module impacts the crossbeam, there are tie rods in the middle part lower surface which impacts the crossbeam, the tie rod connects the counterweight block, there are impact baffles and impact hammers sequentially under the counterweight block; the problem of coarse aggregate splashing caused by uneven impact force is solved by additionally arranging the impact baffle; the rubber buffer layer is additionally arranged on the base, so that the impact of the impact hammer on the base module is further reduced, and the service life is prolonged.
Description
Technical Field
The utility model relates to a highway engineering test device field especially relates to a coarse aggregate impact tester.
Background
Currently, in highway engineering, the impact value is an important index for judging the quality of coarse aggregates. The coarse aggregate impact resistance test is a test for measuring the impact resistance of the coarse aggregate for the pavement by loading the coarse aggregate into a test die with a fixed size and adopting a weighing impact block to impact the coarse aggregate at a fixed height, and the impact value is expressed by the mass percentage of a part which is smaller than 2.36mm after the test.
The concrete operation and parameters are specified in T0322-2000 of road engineering aggregate test Specification JTGE 42-2005. The test requirements are as follows: the mass of the impact hammer is 13.75kg plus or minus 0.05kg, and the distance between the bottom surface of the impact hammer and the aggregate is 380mm plus or minus 5 mm; the impact hammer hammers the aggregate 15 times at the required height, and the hammering interval is not less than 1 s; after the first hammer blow, the height is not adjusted.
The existing impact testing machine needs a tester to manually lift the impact hammer, and the impact hammer hammers the aggregate by free-falling motion. Because the manual work is adopted for impact, the impact height of 380mm is mainly measured by the experience and the sight of a person, the height of 380mm can not be accurately kept in the test process all the time, meanwhile, the performance of the coarse aggregate tested at each time is different, and the heights of samples are different, so that the mode that the experimenter estimates the height by experience is easy to have larger errors, and the accuracy of the test result is influenced. Simultaneously, appear easily among the impact test process and pop out the impact hammer with the extrusion of coarse aggregate and lead to experimenter injured and because adopt artifical promotion impact to lead to highly differ, impact strength is inhomogeneous to cause the circumstances that strikes piece and examination mould unbalance and the examination mould bounce appears, make the coarse aggregate spill further influence the experimental accuracy of impact value.
SUMMERY OF THE UTILITY MODEL
The technical problem that this application solved is that current impact tester highly is 380mm all the time when unable accurate the keeping at every turn experimental because coarse aggregate performance is inconsistent, and current tester easily appears the coarse aggregate and pops out and lead to the result inaccurate, appears the injured problem of testing personnel even.
In order to solve the technical problem, the utility model provides a coarse aggregate impact tester, which comprises a base module, a bracket module and an impact module; the base module comprises a steel chassis, a rubber buffer layer with a positioning groove is fixed on the upper surface of the steel chassis, and the truncated cone-shaped cast iron base is arranged in the positioning groove of the rubber buffer layer; an impact cylinder positioning groove is further formed in the circle center of the upper surface of the cast iron base, and two support fixing holes are symmetrically formed in the outer side of the impact cylinder positioning groove; the impact barrel is arranged in the impact barrel positioning groove and is provided with an upward opening; the support module comprises two guide rods vertically arranged in the support fixing holes, and the top ends of the guide rods are connected through a framework cross beam arranged between the two pairs of positioning nuts; the middle part of the framework cross beam is also provided with a through hole, and a positioning bolt is movably arranged in the through hole; the impact module comprises a movable impact beam horizontally sleeved on the guide rod, impact handles are fixed at the left end and the right end of the impact beam, a connecting rod is arranged on the lower surface of the middle part of the impact beam and connected with a balancing weight, and an impact baffle and an impact hammer are sequentially arranged below the balancing weight; the upper surface of the impact beam tightly abuts against the lower end of the positioning bolt; the impact beam is arranged on the guide rod, and the impact beam is arranged on the guide rod.
Particularly, the top end of the connecting rod is connected with the lower surface of the impact beam through threads, and the balancing weight is annular and sleeved outside the connecting rod.
In particular, the impact baffle is disc-shaped, the diameter of the impact baffle is larger than the inner diameter of the impact hammer, and the thickness of the impact hammer is equal to the depth of the impact cylinder.
The utility model has the advantages that: the utility model discloses a set up adjustable positioning bolt for initial hammering when supporting tight positioning bolt bottom at every turn highly is 380mm, prevents the problem that the coarse aggregate that leads to because impact force is inhomogeneous splashes through adding the impact baffle, and adds at the base and established the rubber buffer layer, has further reduced the impact of jump bit to the base module, increase of service life.
Drawings
Fig. 1 is a schematic view of the structure of the device of the present invention.
Wherein, the steel chassis-1; a rubber cushion layer-11; a positioning groove-11 a; a cast iron base-12; an impact barrel positioning groove-12 a; a bracket fixing hole-13; an impact barrel-14; a guide rod-2; a framework beam-21; a through hole-22; a positioning bolt-23; an impact beam-31; an impact handle-32; a connecting rod-33; a counterweight-34; an impact baffle-35; a percussion hammer-36; rotating the fixed pin-37.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
A coarse aggregate impact tester comprises a base module, a bracket module and an impact module; the base module comprises a steel chassis 1, a rubber buffer layer 11 with a positioning groove 11a is fixed on the upper surface of the steel chassis 1, and a truncated cone-shaped cast iron base 12 is arranged in the positioning groove 11a of the rubber buffer layer 11; an impact cylinder positioning groove 12a is further formed in the center of the circle of the upper surface of the cast iron base 12, and two support fixing holes 13 are further symmetrically formed in the outer edge of the impact cylinder positioning groove 12 a; the impact barrel is also provided with an upward-opening impact barrel 14 arranged in the impact barrel positioning groove 12 a; the support module comprises two guide rods 2 vertically arranged in the support fixing holes 13, and the top ends of the guide rods 2 are connected through a framework cross beam 21 clamped between two pairs of positioning nuts; the middle part of the framework cross beam 21 is also provided with a through hole 22, and a positioning bolt 23 is movably arranged in the through hole 22; the impact module comprises a movable impact beam 31 horizontally sleeved on the guide rod 2, impact handles 32 are fixed at the left end and the right end of the impact beam 31, a connecting rod 33 is arranged on the lower surface of the middle of the impact beam 31, the connecting rod 33 is connected with a balancing weight 34, and an impact baffle 35 and an impact hammer 36 are sequentially arranged below the balancing weight 34; the upper surface of the impact beam 31 abuts against the lower end of the positioning bolt 23; and a rotation fixing pin 37 penetrating through the impact beam 31 and tightly abutting against the guide bar 2.
The base module includes steel chassis 1, rubber buffer layer 11 and cast iron base 12, and steel chassis 1 is made by diameter 360mm, the ordinary steel of high 20mm, and edge angle is all removed along the edge and is handled, prevents the testing process fish tail detection personnel, and steel chassis 1 can absorb and transmit the impact force simultaneously. The rubber buffer layer 11 is made of hard rubber with the diameter of 320mm and the thickness of 5mm, and the rubber buffer layer 11 can better transmit and absorb the upper impact load, reduce the vibration in the test process and keep the continuity of the impact process. The cast iron base 12 is made of cast iron, and is a round table shape with the diameter of the upper opening of 260mm, the diameter of the lower opening of 300mm and the height of 40mm, an impact barrel positioning groove 12a with the diameter of 124mm and the depth of 10mm is reserved in the central position of the upper opening of the round table shape and is used for fixing an impact barrel 14, and a bracket fixing hole 13 with the diameter of 32mm and the depth of 15mm is reserved outside the impact barrel positioning groove 12a along the symmetrical position and is used for fixedly connecting the guide rod 2.
The support module comprises a guide rod 2, a framework cross beam 21 and a positioning bolt 23; the number of the guide rods 2 is 2, the guide rods are made of stainless steel with the diameter of 32mm and the height of 750mm, the bottom ends of the guide rods are connected into the support fixing holes 13 in the cast iron base 12, and the top ends of the guide rods are made into a screw mouth shape and used for fixing the framework cross beam 21; the framework cross beam 21 is made of cast iron with the length of 290mm, the width of 60mm and the height of 20mm, two holes with the diameter of 33mm are arranged at the two ends of the framework cross beam 21 in a vertically penetrating mode and used for penetrating through the guide rod 2, a through hole 22 with the diameter of 20mm is reserved in the center of the framework cross beam 21 and used for a positioning bolt 23 to penetrate through, and the positioning bolt 23 is movably connected with the through hole 22 through threads. The guide rod 2 can bear the gravity of the whole impact module, so that the whole impact test process is kept from deformation, and the impact module is ensured to vertically and freely fall downwards; the positioning nut is used for fixing the framework cross beam 21, keeping firm connection between the framework cross beam 21 and the guide rod 2, and meanwhile, being convenient for quick disassembly. The positioning bolt 23 can move up and down on the framework cross beam 21 to ensure that the initial falling height of the impact module is consistent, and the height of the contact surface between the impact hammer 36 and the coarse aggregate is kept fixed at 380mm all the time by adjusting the length of the part, exceeding the framework cross beam 21, of the lower end of the positioning bolt 23 before an impact test.
The impact module comprises an impact handle 32, an impact beam 31, a rotary fixing pin 37, a connecting rod 33, a balancing weight 34, an impact baffle 35, an impact hammer 36 and an impact barrel 14. The impact handle 32 adopts a two-section design of 30mm in diameter, 100mm in length and 16mm in length, 30mm in diameter, the material is steel, the end with the diameter of 16mm is connected to the center of the side surface of the impact beam 31, and a symmetrical design is adopted; the impact beam 31 is designed by adopting a cuboid with the length of 270mm, the width of 54mm and the height of 20mm, through holes with the diameter of 33mm are arranged at the left end and the right end of the impact beam 31 and are used for penetrating through the guide rod 2, and meanwhile, the impact beam 31 can vertically and freely slide on the guide rod 2; the rotary fixing pin 37 is made of high-strength steel with the diameter of 14mm and the height of 30mm, is arranged on the transverse side surface of the impact beam 31, and can tightly abut against the guide rod 2 so as to fix the impact beam 31; the connecting rod 33 is designed to be a cylinder with the diameter of 40mm and the height of 70mm and is made of common steel, the top end of the connecting rod is in tapping connection with the center of the lower surface of the impact beam 31, and the bottom end of the connecting rod is provided with an impact baffle 35 and an impact hammer 36; the impact baffle 35 is designed to be a cylinder with the diameter of 144mm and the height of 20mm, is made of common steel, and adopts a corner removing process; the impact hammer 36 is designed to be a cylinder with the diameter of 100mm and the height of 50mm, is made of high-strength manganese steel, is tempered on the outer surface of the impact hammer, and adopts a corner removing process at the bottom of the impact hammer; the balancing weight 34 is designed by adopting a circular ring with the inner diameter of 40mm, the outer diameter of the balancing weight is provided with a plurality of specifications with different diameters according to different masses of the balancing weight 34, the balancing weight is made of common steel materials and is sleeved outside the connecting rod 33, and the bottom end of the balancing weight is connected with the impact baffle 35; the impact cylinder 14 is made of cylindrical high-strength manganese steel with the outer diameter of 122mm and the height of 70mm, a cylinder with the diameter of 102mm and the depth of 50mm is drawn at the upper center, and the surface of the cylinder is subjected to toughening treatment.
In the whole impact module, the impact handle 32 can facilitate an operator to lift the whole impact module, and the impact beam 31 mainly fixes the impact module to freely slide on the guide rod 2, so that the stability of the whole impact module can be ensured; the connecting rod 33, the balancing weight 34, the impact baffle 35 and the impact hammer 36 are connected into a whole, and the balancing weight 34 is used for keeping the weight of the whole impact module constant and inconvenient, so that the impact load is uniform and consistent; the impact baffle 35 is used for blocking the coarse aggregate crushed stones ejected in the impact process, so that the safety of detection personnel is ensured, and meanwhile, the ejected particles are knocked back into the impact cylinder 14, so that the accuracy of the test result is kept.
In a preferred embodiment, the top end of the connecting rod 33 is connected to the lower surface of the impact beam 31 through a screw, and the weight 34 is annular and is sleeved outside the connecting rod 33.
In a preferred embodiment, the impact baffle 35 is a disk shape, the diameter of the impact baffle is larger than the inner diameter of the impact hammer 36, and the thickness of the impact hammer 36 is equal to the depth of the impact cylinder 14.
The utility model discloses the application method of device does: cleaning the surface of the steel chassis 1, coating a layer of the rubber buffer layer 11 with 502 glue, quickly adhering the rubber buffer layer 11 to the surface of the steel chassis 1, coating 502 glue on the other surface of the rubber buffer layer 11, and quickly adhering the cast iron base 12 to the surface to form a base module; installing 2 guide rods 2 in the support fixing holes 13 on the cast iron base 12, enabling the impact cross beam 31 to penetrate through the guide rods 2, fixing the impact cross beam 31 at the center of the guide rods 2 by using the rotary positioning pins 37, then respectively rotating the fixing nuts into 2 pieces of the top ends of the guide rods 2, placing the framework cross beam 21, and fixing the framework cross beam 21 by using 2 pieces of the fixing nuts to form a support module. And the impact handle 32 is welded at two ends of the impact beam 31, the connecting rod 33, the balancing weight 34, the impact baffle 35 and the impact hammer 36 are fixedly connected in sequence, and the top end of the connecting rod 33 is tapped and connected with an internal thread hole on the lower surface of the impact beam 31. After the assembly is completed, the length, width and weight of the whole device are about 550mm, 550mm and 900mm, and the weight is about 80 kg.
After all the assemblies are finished, the impact cylinder 14 is moved from the cast iron base 12 to an operation platform, samples are prepared according to the standard requirements, and coarse aggregates m are weighed1=615.7g, pouring into the impact cylinder 14, inserting and smashing for 25 times by a tamping rod, placing the impact cylinder 14 on the cast iron base 12, and adjusting the punchThe height of the bottom surface of the impact hammer 36 and the surface of the coarse aggregate is 380mm, the height is fixed by a rotary positioning pin 37, a positioning bolt 23 is screwed to be in contact with the upper surface of an impact beam 31, the height of an impact module is lifted to the impact beam 31 to be in contact with the positioning bolt 23 each time, the height of the impact hammer and the surface of the coarse aggregate is 380mm, the impact handle is manually grasped, the rotary positioning pin 37 is loosened, the impact handle 32 is loosened, the impact module freely falls along a guide rod 2 to impact the coarse aggregate, then the impact module is lifted to the impact beam 31 to be in contact with the positioning bolt 23 again, the impact handle 32 is also loosened, the coarse aggregate is impacted by free falling, the coarse aggregate does not overflow or pop up, the test mold does not bounce and the like, the steps are repeated, after the coarse aggregate is impacted for 15 times, the impact beam 31 is fixed at the upper end of the guide rod 2 by the rotary positioning pin 37, sieving to remove particles with particle diameter less than 2.36mm, and weighing particles with mass m less than 2.36mm2(ii) a Weigh the coarse aggregate m again3=615.7g, all according to the above steps, finally weighing particle mass m less than 2.36mm4And dividing the mass of the particles smaller than 2.36mm by the total mass of the coarse aggregates to calculate the impact value AIV of the coarse aggregates.
Claims (3)
1. A coarse aggregate impact tester is characterized by comprising a base module, a bracket module and an impact module; the base module comprises a steel chassis (1), a rubber buffer layer (11) with a positioning groove (11 a) is fixed on the upper surface of the steel chassis (1), and a truncated cone-shaped cast iron base (12) is arranged in the positioning groove (11 a) of the rubber buffer layer (11); an impact barrel positioning groove (12 a) is further formed in the center of the circle of the upper surface of the cast iron base (12), and two support fixing holes (13) are further symmetrically formed in the outer edge of the impact barrel positioning groove (12 a); the impact barrel is arranged in the impact barrel positioning groove (12 a) and is provided with an upward opening (14); the support module comprises two guide rods (2) vertically arranged in the support fixing holes (13), and the top ends of the guide rods (2) are connected through a framework cross beam (21) clamped between two pairs of positioning nuts; the middle part of the framework cross beam (21) is also provided with a through hole (22), and a positioning bolt (23) is movably arranged in the through hole (22); the impact module comprises a movable impact beam (31) horizontally sleeved on the guide rod (2), impact handles (32) are fixed at the left end and the right end of the impact beam (31), a connecting rod (33) is arranged on the lower surface of the middle of the impact beam (31), the connecting rod (33) is connected with a balancing weight (34), and an impact baffle (35) and an impact hammer (36) are sequentially arranged below the balancing weight (34); the upper surface of the impact beam (31) abuts against the lower end of the positioning bolt (23); and the rotary fixing pin (37) penetrates through the impact beam (31) and is tightly abutted against the guide rod (2).
2. The coarse aggregate impact tester according to claim 1, wherein the top end of the connecting rod (33) is connected with the lower surface of the impact beam (31) through a screw thread, and the counterweight (34) is annular and is sleeved outside the connecting rod (33).
3. The coarse aggregate impact tester as claimed in claim 1, wherein said impact baffle (35) is disc-shaped, with a diameter greater than the inner diameter of the impact hammer (36), and the thickness of the impact hammer (36) is equal to the depth of the impact cylinder (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021141132.3U CN212432847U (en) | 2020-06-18 | 2020-06-18 | Impact tester for coarse aggregate |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021141132.3U CN212432847U (en) | 2020-06-18 | 2020-06-18 | Impact tester for coarse aggregate |
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| CN212432847U true CN212432847U (en) | 2021-01-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113218788A (en) * | 2021-04-29 | 2021-08-06 | 安徽理工大学 | Multi-particle impact crushing experiment platform |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113218788A (en) * | 2021-04-29 | 2021-08-06 | 安徽理工大学 | Multi-particle impact crushing experiment platform |
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