CN112378731A - Pitch bending beam rheological test piece former - Google Patents
Pitch bending beam rheological test piece former Download PDFInfo
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- CN112378731A CN112378731A CN202011461954.4A CN202011461954A CN112378731A CN 112378731 A CN112378731 A CN 112378731A CN 202011461954 A CN202011461954 A CN 202011461954A CN 112378731 A CN112378731 A CN 112378731A
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- 238000012360 testing method Methods 0.000 title claims abstract description 62
- 238000005452 bending Methods 0.000 title claims abstract description 27
- 239000010426 asphalt Substances 0.000 claims abstract description 65
- 238000000465 moulding Methods 0.000 claims abstract description 50
- 238000007790 scraping Methods 0.000 claims abstract description 28
- 238000005266 casting Methods 0.000 claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims description 61
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- 238000006073 displacement reaction Methods 0.000 claims description 11
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 7
- 238000005057 refrigeration Methods 0.000 claims description 6
- 241000252254 Catostomidae Species 0.000 claims description 2
- 238000005485 electric heating Methods 0.000 claims 1
- 239000011230 binding agent Substances 0.000 abstract description 7
- 230000007547 defect Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 13
- 239000002184 metal Substances 0.000 description 9
- 238000001816 cooling Methods 0.000 description 8
- 239000002985 plastic film Substances 0.000 description 5
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 3
- 239000004568 cement Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000004519 grease Substances 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000000518 rheometry Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 235000019441 ethanol Nutrition 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/44—Sample treatment involving radiation, e.g. heat
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
- G01N2001/366—Moulds; Demoulding
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention relates to a test piece forming instrument for a rheological test of an asphalt bending beam, which comprises a box body, wherein an inner cavity of the box body is sequentially provided with: a temperature control unit for controlling the temperature of the asphalt; a molding unit for asphalt casting film; a die-scraping unit for scraping a die; and a demolding unit for demolding; the inner wall of the box body is provided with a height control unit for adjusting the heights of the temperature control unit, the molding unit and the scraping unit; the temperature control, the film pouring, the molding, the film scraping and the demolding of the asphalt binder trabecula test piece are integrated, so that the efficiency is high, and the operation is simple; the pouring mold is arranged below the temperature control, so that the defects that the asphalt binder is poor in fluidity and increased in viscosity, and the mold is difficult to pour are overcome; meanwhile, the height control unit controls the heights of the temperature control unit, the molding unit and the mold scraping unit, so that the mold casting work which needs to be completed by cooperation of multiple persons is changed into the high-efficiency molding work which can be realized by only one person.
Description
Technical Field
The invention belongs to the field of asphalt tests of highway engineering, and relates to a test piece forming instrument for an asphalt bending beam rheological test.
Background
The low-temperature cracking is one of the main diseases of the asphalt pavement, and researches show that the improvement of the low-temperature performance of the asphalt is a main measure for improving the performance of the asphalt pavement. To study the low temperature properties of asphalt, the american highway strategic research project, shirr (structural high way research program), based on rheology theory, proposed a low temperature bending beam rheology test (BBR) that characterizes the low temperature properties of asphalt materials using their stiffness modulus(s) and stiffness change rate (m) under low temperature conditions. At present, the bending beam rheological test becomes one of the only means for testing the low-temperature performance of the asphalt material in China. Meanwhile, the road engineering asphalt and mixture test regulation (JTG E20-2011) specifies a test piece forming and testing method of an asphalt bending creep stiffness test (a bending beam rheometer method) in detail as follows:
1. preparation of a metal mold:
(1) cleaning the mold, coating a layer of petroleum-based lubricating grease on the inner surfaces of 3 long metal parts of the mold, flatly adhering a plastic sheet to the metal by using the lubricating grease, placing the plastic sheet on the surface of the metal, pressing the plastic sheet by using hands, and pressing the plastic sheet on the surface of the metal by virtue of friction force;
(2) coating the inner surfaces of the two end pieces with a mixture of glycerol and talc to prevent the asphalt from sticking to the metal end pieces;
(3) installing the mold according to the standard, tightly binding the mold together by using an O-shaped rubber ring, checking the mold, and forcibly pressing the rubber sheet to the metal surface to extrude bubbles;
(4) after the installation is finished, the mold is placed at room temperature to wait for pouring asphalt.
2. And (3) manufacturing a test piece:
(1) heating asphalt in an oven until the asphalt flows sufficiently to form a state of easy pouring;
(2) and placing the mold at room temperature, pouring the asphalt back and forth from one end of the mold to the other end of the mold, and cooling the mold filled with the asphalt at room temperature for 45-60 min.
(3) After cooling to room temperature, the cooled asphalt sample above the top of the mold was cut off with a hot knife and flattened.
3. And (3) storage and demolding of the test piece:
(1) after the pouring of the test piece is finished, the test needs to be finished within 4 h;
(2) before demoulding, the metal mould containing the asphalt is placed in a water bath for cooling, so that the test piece is not deformed during demoulding, the cooling temperature is preferably minus or plus 5 ℃, and the cooling time is 5-10 min;
(3) when the test piece in the mold reaches the demolding condition, the metal mold is immediately detached to remove the test piece. To avoid deformation of the test piece, the plastic sheet and side forms should be slip stripped from the test piece.
A large number of tests show that the mould forming and demoulding of the asphalt test piece have a plurality of problems:
(1) under the condition of a specified temperature, if fiber mineral powder and other components exist in the asphalt cement, the asphalt cement has poor fluidity and increased viscosity, so that the molding is difficult;
(2) two persons are generally required to cooperate in the assembling and assembling process of the die, so that time and labor are wasted, and the efficiency is not high;
(3) the test mould is fixed by adopting an O-shaped rubber ring specified in the specification, the test mould is easy to slide, and the obtained test mould is unstable;
(4) when the mold is not poured in time, the temperature of the asphalt is reduced, and the asphalt needs to be heated repeatedly, so that the asphalt is aged, and the accuracy of test data of a control test group is influenced;
(5) the scraper has large temperature change and is not easy to scrape the die;
(6) only one asphalt trabecula test piece can be molded each time, the process is complicated, and the efficiency is low; the force is not uniform in the demoulding process, and the test piece is easy to fail to be manufactured.
Disclosure of Invention
The invention aims to provide an asphalt test piece molding instrument for a bending beam rheometer, which solves the problems that in the prior art, a manufacturing mold for a bending beam test piece is of an independent structure, the mold needs to be assembled automatically during manufacturing tests, and the operation process is complicated.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention provides an asphalt test piece molding instrument for a bending beam rheometer, which comprises a box body, wherein an inner cavity of the box body is sequentially provided with:
a temperature control unit for controlling the temperature of the asphalt;
a molding unit for asphalt casting film;
a die-scraping unit for scraping a die;
and a demolding unit for demolding;
and a height control unit for adjusting the heights of the temperature control unit, the molding unit and the scraping unit is arranged on the inner wall of the box body.
Preferably, the temperature control unit comprises a temperature control tray, a forming heating groove, a first heating wire, a first temperature sensor and a temperature controller, wherein the temperature control tray is mounted on the height control unit; a plurality of molding heating grooves are uniformly distributed on the temperature control tray; the two first heating wires are arranged on the two outer side walls of the forming heating groove; the first temperature sensor is arranged on the inner wall of the forming heating groove and used for collecting the temperature of the inner cavity of the forming heating groove in real time; and transmitting the collected temperature to a temperature controller; the first heating wire and the first temperature sensor are both connected with a temperature control system; the temperature controller is used for controlling the heating power of the first heating wire according to the received temperature.
Preferably, the bottom of the forming heating groove is provided with a sliding groove along the axial direction, and the sliding groove is provided with a pulling piece in a matching way; the length of the pulling piece is greater than that of the sliding groove, and the pulling piece is provided with a long hole.
Preferably, eight corners of the temperature control tray are provided with a first lifting pulley, and two first lifting pulleys arranged on the same vertical axis are slidably mounted on the slide rail; the slide rail is installed on the inner wall of box body.
Preferably, the molding unit comprises a molding tray and a pouring mold groove, wherein the molding tray is slidably mounted on the height control unit; the pouring mold grooves are arranged in a plurality and are uniformly distributed on the molding tray.
Preferably, the casting mold groove comprises a side plate, a lifting column, a rectangular groove body, an electromagnetic chuck and a door closer, wherein mounting grooves are formed in two long side walls of the rectangular groove body; the two side plates are arranged in the inner cavity of the rectangular groove body; two ends of the inner cavity of the rectangular groove body are respectively provided with a lifting column;
a plurality of electromagnetic chucks are uniformly distributed on the tops of the two long side walls of the rectangular groove body;
the fixed end of the door closer is arranged on the mounting groove; the working end of the door closer is arranged on the side plate.
Preferably, eight corners of the film forming tray are respectively provided with a lifting pulley, and the lifting pulleys are arranged on the height control unit in a matching way;
the lifting column comprises a first telescopic column and a second telescopic column, the first telescopic column is sleeved on the second telescopic column, and the first telescopic column and the second telescopic column are in sliding connection;
the first telescopic column is provided with an inner cavity, a fourth motor is arranged in the inner cavity, and an output shaft of the fourth motor is connected with the second telescopic column;
the fourth motor is connected with a casting mold controller, and the rotating speed of the fourth motor is realized through the casting mold controller.
Preferably, the die scraping unit comprises a scraper, a lifting slide bar, a displacement pulley and an electric motor, wherein two ends of the scraper are respectively provided with one displacement pulley; each displacement pulley is connected with a lifting slide bar in a sliding way;
each lifting slide bar is meshed with a gear, the gear is sleeved on an output shaft of an electric motor, and the electric motor is arranged on the inner wall of the box body;
the two lifting slide bars are both connected with the height control unit;
the scraper is provided with a second heating wire and a second temperature sensor, and the second temperature sensor is used for collecting the temperature of the scraper and transmitting the collected temperature to the scraping mould controller; the scraping mould controller is used for controlling the heating power of the second heating wire according to the received temperature; at the same time, the rotation rate of the electric motor is controlled.
Preferably, the demolding unit comprises a water tank tray, refrigeration equipment, a temperature sensor and an ejection column, wherein the water tank tray is filled with absolute ethyl alcohol, and the bottom of an inner cavity of the water tank tray is provided with the refrigeration equipment; a third temperature sensor is arranged on the inner side wall of the water tank tray;
the ejection column is of an L-shaped structure, and one end of the L-shaped structure is connected with an output shaft of the stepping motor; the other end of the L-shaped structure is fixed on the side wall of the lifting column of the molding unit;
the third temperature sensor, the refrigeration equipment and the stepping motor are all connected to the demoulding controller, wherein the third temperature sensor is used for collecting the temperature of the inner cavity of the water tank tray and transmitting the collected temperature to the demoulding controller; the demoulding controller is used for controlling the refrigerating power of the refrigerating equipment according to the received temperature; at the same time, the rotation rate of the stepping motor is controlled.
Preferably, the height control unit comprises two groups of caterpillar tracks which are respectively arranged on two inner walls of the box body in symmetrical arrangement;
each group of caterpillar tracks comprises a first caterpillar track, a second caterpillar track and a third caterpillar track, wherein the first caterpillar track is connected with a first motor in a meshed mode; the second caterpillar track is connected with a second motor in a meshed mode; the third caterpillar track is connected with a third motor in a meshed mode;
two ends of a temperature control tray of the temperature control unit are respectively connected with the two first caterpillar tracks;
two ends of a film forming tray of the molding unit are respectively connected with the two second caterpillar tracks;
two lifting slide bars of the mould scraping unit are respectively connected with two third chain rails;
the first motor, the second motor and the third motor are all connected with a height controller; the height controller is used for the rotation rate of the first motor, the second motor and the third motor.
Compared with the prior art, the invention has the beneficial effects that:
according to the asphalt test piece forming instrument for the bending beam rheometer, the temperature control, the film pouring, the forming, the film scraping and the demolding of an asphalt binder trabecula test piece are integrated, the efficiency is high, and the operation is simple; the pouring mold is arranged below the temperature control, so that the defects that the asphalt binder is poor in fluidity and increased in viscosity, and the mold is difficult to pour are overcome; meanwhile, the height control unit controls the heights of the temperature control unit, the molding unit and the mold scraping unit, so that the mold casting work which needs to be completed by cooperation of multiple persons is changed into the high-efficiency molding work which can be realized by only one person.
Furthermore, by means of a combination mode of the door closer and the side die, an opening mode angle is increased, pouring of fiber asphalt mortar is facilitated, and the application range of the combination material is expanded.
Furthermore, a combined form of a lifting column and a door closer is adopted, the opening, closing and lifting force of the side mold and the ejection column can be accurately controlled, and the stability of the mold testing is improved.
Furthermore, the temperature control tray can keep the asphalt binder in the heating groove to keep constant temperature through the combination of the sensor and the heating wire, has certain fluidity, is convenient for pouring the mixture, and avoids asphalt aging caused by repeated heating.
Furthermore, a plurality of asphalt trabecula test pieces can be formed at one time, and the efficiency is higher
Furthermore, the ejection column is combined with the lifting column in the demolding process, so that the stress of the test piece is uniform, and the success rate is high.
Furthermore, a peripheral frame of the die is realized through a side plate controlled by a door closer and a hydraulic lifting column controlled by a reciprocating motor; the lifting column is mainly automatically lifted through an internal small-sized reciprocating motor, the protrusion can be used in the pouring process, the depression can be used in the demolding process, the maximum pushing force and the maximum pulling force of the lifting column and the push-pull self-locking force are all more than 100N, and the stability of molds on two sides can be met; meanwhile, the side plate is mainly fixed through a door closer, and the door closer provides stability for the side plate through an internal hard spring; the side plate controlled by the door closer and the hydraulic lifting column controlled by the reciprocating motor make up for the defect that a used O-shaped rubber ring fixing test mould is easy to slide.
Drawings
FIG. 1 is a schematic structural appearance diagram of a bending beam rheometer asphalt test piece molding instrument;
FIG. 2 is a right side view of a bending beam rheometer asphalt test piece former;
FIG. 3 is a rear view of a bending beam rheometer asphalt test piece former;
FIG. 4 is a schematic view of the external appearance of the heating tank structure;
FIG. 5 is an external view of a casting mold slot;
FIG. 6 is a schematic view of a door closer construction;
FIG. 7 is a schematic exterior view of a doctor blade system;
FIG. 8 is a schematic view of the appearance of a pull tab structure;
FIG. 9 is a schematic view of the appearance of the lifting column;
FIG. 10 is a schematic view of a height control unit;
FIG. 11 is a schematic view of a sink tray structure;
wherein: 1-box body, 2-temperature control tray, 3-mould scraping system, 4-mould forming tray, 5-absolute ethyl alcohol water tank, 6-master control system, 7-demoulding box, 8-ejection column, 9-box door, 10-box handle, 11-sealing strip, 14-first lifting pulley, 15-first chain track, 16-first temperature sensor, 17-first heating wire, 18-temperature controller, 19-pulling piece, 20-height controller, 21-mould pouring groove, 21-side plate, 22-lifting column, 23-rectangular groove body, 24-electromagnetic suction cup, 25-door closer, 26-door closing rod, 27-spring, 28-steering piece, 29-main body, 30-fixed end, 31-second lifting pulley, 33-scraper, 34-third chain track, 35-lifting slide bar, 36-displacement pulley, 37-electric motor, 38-second heating wire, 39-second temperature sensor, 40-casting mold controller, 41-mold scraping controller, 42-demolding controller, 43-stepping motor, 44-first motor, 45-first fixer, 46-second fixer, 47-second chain track, 48-third temperature sensor and 49-refrigerating equipment.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1 to 11, the pitch test piece molding instrument for the bending beam rheometer provided by the invention comprises a box body 1, wherein a temperature control tray 2 is arranged at the upper part of an inner cavity of the box body 1; a scraping die system 3 is arranged at the middle upper part of the inner cavity of the box body 1; a molding tray 4 is arranged at the middle lower part of the inner cavity of the box body 1; a water tank tray 5 is arranged at the lower part of the inner cavity of the box body 1; the bottom of the inner cavity of the box body 1 is provided with a master control system 6; a demoulding box 7 is arranged at the rear side of the box body 1; and the upper part of the demolding box is provided with an ejection column 8.
The box body is provided with a box door 9, and the box door 9 is provided with a box handle 10.
And a sealing strip 11 is arranged between the box door 9 and the box body 1.
Five molding heating grooves 12 are arranged on the temperature control tray 2, and the five molding heating grooves 12 are uniformly distributed on the temperature control tray 2.
The longitudinal section of the molding heating groove 12 is of a T-shaped structure, so that the pouring of asphalt is facilitated; the bottom of the big end of the forming heating groove 12 is symmetrically provided with two first heating wires 17 by taking the small end as the center, and the first heating wires 17 are fixed in the grooves formed on the outer side wall.
A T-shaped inner cavity is formed in the forming heating groove 12 along the axial direction of the forming heating groove, and a first temperature sensor 16 is arranged on the step of the T-shaped inner cavity.
The first temperature sensor 16 and the first heating wire 17 are both connected to a temperature controller.
The first temperature sensor 16 is used for acquiring the temperature in the forming heating groove in real time and transmitting the acquired temperature to the temperature controller; the temperature controller is used for controlling the heating power of the first heating wire according to the received temperature.
The bottom of the forming heating groove 12 is provided with a sliding groove along the axial direction thereof, and the sliding groove is provided with a pulling piece 19 in a matching way.
The pull tab 19 is provided with a long hole.
Meanwhile, the length of the pulling piece 19 is larger than that of the sliding groove, and one end of the pulling piece 19 is arranged on the outer side of the box body 1.
Eight corners of the temperature control tray 2 are provided with a first lifting pulley 14, and two first lifting pulleys 14 arranged on the same vertical axis are arranged on the sliding rail in a sliding manner; the slide rail is arranged on the inner wall of the box body 1; for reducing the friction between the temperature control tray 2 and the case body 1.
Both ends of the temperature control tray 12 are connected to the height control unit through first holders 45.
The film forming tray 4 is provided with five pouring mold grooves which are uniformly distributed on the upper surface of the film forming tray 4.
Each casting mold groove comprises a side plate 21, a lifting column 22, a rectangular groove body 23, an electromagnetic chuck 24 and a door closer 25, wherein mounting grooves are formed in two long side walls of the rectangular groove body 23, and each mounting groove is provided with one door closer 25.
The number of the side plates 21 is two, and the two side plates are both arranged at an opening of an inner cavity of the rectangular groove body 23; both ends of the inner cavity of the rectangular groove body 23 are provided with a lifting column 22, and the lifting column 22 is connected with the bottom of the inner cavity of the rectangular groove body 23 in a sliding manner.
The tops of the two long side walls of the rectangular groove body 23 are uniformly provided with a plurality of electromagnetic suckers 24.
The electromagnetic chuck 24 is connected with a mold casting controller, and the mold casting controller is used for controlling the starting and stopping of the electromagnetic chuck 24.
The electromagnetic chuck 24 is connected with the side plate 21 in a magnetic attraction mode in a power-on state; at this time, the two side plates 21 are opened and closed at an angle of 90 °.
When the electromagnetic chuck 24 is not electrified, the two side plates 21 are arranged in a parallel structure.
The lifting column 22 comprises a first telescopic column 2201 and a second telescopic column 2202, wherein the first telescopic column 2201 is sleeved on the second telescopic column 2202, and the first telescopic column 2201 and the second telescopic column 2202 are connected in a sliding mode.
An inner cavity is formed in the first telescopic column 2201, a fourth motor is installed in the inner cavity, and an output shaft of the fourth motor is connected with the second telescopic column; the lifting column is used for realizing automatic lifting.
The fourth motor is connected with a casting mold controller, and the rotating speed of the fourth motor is realized through the casting mold controller.
The door closer 25 comprises a door closing rod 26, a spring 27, a steering piece 28, a main body 29 and a fixed end 30, wherein the main body 29 is fixed on a mounting groove on the rectangular groove body 23, a mounting piece is arranged on the main body 29, the spring 27 is arranged in an inner cavity of the mounting piece, and one end of the spring 27 is fixed on the inner wall of the mounting piece; the other end of the spring 27 is fixed to the end side wall of the door closing lever 26.
One end of the mounting part is rotatably connected with a steering part 28; one end of the deflection element 28 is connected to the closing lever 26 in an articulated manner.
One side of the free end of the door closing rod 26 is slidably connected with one end of the fixed end 30, and the other end of the fixed end 30 is fixed on the side plate 21.
When the electromagnetic chuck 24 is in a non-energized state, after the magnetic attraction between the electromagnetic chuck 24 and the side plate 21 disappears, the door closing rod 26 drives the side plate 21 to close under the action of the spring 27, so that the side plate 21 is automatically closed, and meanwhile, the pouring of asphalt binder cement is realized.
Eight corners of the film forming tray 4 are provided with a second lifting pulley 31, and the two second lifting pulleys 31 arranged on the same vertical axis are slidably mounted on a slide rail.
Both ends of the film forming tray 4 are connected to a height control unit via a second holder 46.
The die scraping system comprises a scraper 33, a lifting slide rod 35, a displacement pulley 36 and an electric motor 37, wherein two ends of the scraper are respectively provided with the displacement pulley 36; each displacement pulley 36 is slidably connected to a lifting slide 35.
The two lifting slide bars 35 are respectively installed on the two symmetrically arranged inner walls of the box body 1.
Each lifting slide bar 35 is engaged with a gear, the gear is sleeved on an output shaft of an electric motor 37, and the electric motor 37 is installed on the inner wall of the box body 1.
The electric motor 37 drives the lifting slide bar 35 to move back and forth, and then drives the scraper to move back and forth.
Each lifting slide 35 is connected to a height control unit.
The scraper is provided with a second heating wire 38 and a second temperature sensor 39, so that the temperature of the scraper can be controlled in real time.
The heating wire 38 is arranged along the length direction of the scraper; the second temperature sensor 39 is mounted at the end of the blade.
The electric motor 37, the second heating wire 38 and the second temperature sensor 39 are all connected to the die controller, wherein the second temperature sensor 39 is used for collecting the temperature of the scraper and transmitting the collected temperature to the die controller; the die scraping controller is used for controlling the heating power of the second heating wire 38 according to the received temperature; at the same time, the rotation rate of the electric motor 37 is controlled.
The demolding system comprises a water tank tray 5 and an ejection column 8, wherein absolute ethyl alcohol is contained in the water tank tray 5, and a refrigerating device 49 is arranged at the bottom of an inner cavity of the water tank tray 5; a third temperature sensor 48 is arranged on the inner side wall of the water tank tray 5.
The absolute ethyl alcohol can be controlled at 5 +/-5 ℃ by refrigeration equipment at the bottom, and the cooling time is 5-10 min.
The ejection column is of an L-shaped structure, and one end of the L-shaped structure is connected with an output shaft of a stepping motor 43; the other end of the L-shaped structure is fixed to the side wall of the lifting column 22.
The third temperature sensor 48, the refrigeration equipment 49 and the stepping motor 43 are all connected to the demoulding controller, wherein the third temperature sensor 48 is used for collecting the temperature of the inner cavity of the water tank tray 5 and transmitting the collected temperature to the demoulding controller; the demolding controller is used for controlling the refrigerating power of the refrigerating equipment 49 according to the received temperature; at the same time, the rotation rate of the stepping motor 43 is controlled.
The height control unit comprises two groups of chain rails which are respectively arranged on two inner walls of the box body 1 in symmetrical arrangement.
Each set of caterpillar tracks comprises a first caterpillar track 15, a second caterpillar track 47 and a third caterpillar track, wherein the first caterpillar track 15 is connected with a first motor 44 in a meshing manner; the second caterpillar track 47 is connected with a second motor 32 in a meshing manner; and the third caterpillar track is connected with a third motor in a meshing manner.
Two ends of the temperature control tray 12 are respectively connected with the two first caterpillar tracks 15 through first fixing devices 45.
Both ends of the film forming tray 4 are connected to two second caterpillar tracks 47 by second holders 46, respectively.
The two lifting slide bars 35 are connected with the two third caterpillar tracks through third fasteners, respectively.
The first motor 32, the second motor 47 and the third motor are all connected with a height controller; the height control is for the rotational rate of the first motor 32, the second motor 47 and the third motor.
The invention relates to a test piece forming method of a pitch test piece forming instrument of a bending beam rheometer, which specifically comprises the following steps:
1. heat preservation and heating of the asphalt binder:
(1) asphalt is heated in an oven to be in a fluidized state, and is injected into the molding heating tank 12.
(2) The asphalt temperature in the molding heating tank is controlled by the first heating wire 17 and the first temperature sensor 16, and the asphalt is easily poured.
2. And (3) a film pouring process:
(1) the heating tray is lowered to above the casting tray by the height system control height control unit.
(2) Through controlling the film pouring system, the miniature lifting column is popped out, the electromagnetic tray is closed, and the forming groove is slowly closed under the action of the door closer.
(3) Meanwhile, the pulling piece at the bottom of the heating tank is manually pulled, so that the asphalt in the heating tank flows into a forming tank in a strand through the rectangular hole at the bottom of the pulling piece, the pulling piece needs to be pulled back and forth in the process, the process that the asphalt is poured back and forth from one end of the mold to the other end is realized, and the mold filled with the asphalt is cooled for 45-60min at room temperature.
3. And (3) a die scraping process:
(1) the scraper temperature is controlled by the heating wire and the temperature sensor, so that the scraper temperature is raised to a corresponding temperature value.
(2) The heated scraper is tightly attached to the top of the forming groove by a height system control height control unit.
(3) Under the control of the scraping system, the scraper realizes the integral horizontal movement of the scraper through an electric motor, selects reasonable scraping speed and displacement direction, cuts off and flattens the asphalt sample which is higher than the top end of the mould after cooling.
4. And (3) demolding:
(1) and (3) completely immersing the molding tray into an absolute ethyl alcohol water tank by using a height system control height control unit, wherein the temperature of the ethyl alcohol is controlled to be minus 5 +/-5 ℃, and the cooling time is 5-10 min.
(2) And lifting the mold to a default height, retracting the lifting column, controlling the ejection column through the stepping motor to eject the well-cast BBR test piece out of the molding groove, and taking out the test piece.
Claims (10)
1. The utility model provides a pitch bending beam rheological test piece former, its characterized in that, includes box body (1), the inner chamber of box body (1) has set gradually from last to bottom:
a temperature control unit for controlling the temperature of the asphalt;
a molding unit for asphalt casting film;
a die-scraping unit for scraping a die;
and a demolding unit for demolding;
and a height control unit for adjusting the heights of the temperature control unit, the molding unit and the scraping unit is arranged on the inner wall of the box body (1).
2. The asphalt bending beam rheological test piece molding instrument according to claim 1, wherein the temperature control unit comprises a temperature control tray (2), a molding heating groove (12), a first heating wire (17), a first temperature sensor (16) and a temperature controller, wherein the temperature control tray (2) is mounted on the height control unit; a plurality of molding heating grooves (12) are uniformly distributed on the temperature control tray (2); the two first electric heating wires (17) are arranged on the two outer side walls of the forming heating groove (12); the first temperature sensor (16) is arranged on the inner wall of the forming heating groove (12) and is used for collecting the temperature of the inner cavity of the forming heating groove (12) in real time; and transmitting the collected temperature to a temperature controller; the first heating wire (17) and the first temperature sensor (16) are both connected with a temperature control system; the temperature controller is used for controlling the heating power of the first heating wire (14) according to the received temperature.
3. The asphalt bending beam rheological test piece molding instrument according to claim 2, wherein a sliding groove is formed in the bottom of the molding heating groove (12) along the axial direction of the molding heating groove, and a pulling piece (19) is installed on the sliding groove in a matched mode; the length of the pull piece (19) is greater than that of the sliding groove, and the pull piece (19) is provided with a long hole.
4. The asphalt bending beam rheological test piece molding instrument according to claim 2, wherein eight corners of the temperature control tray (2) are provided with a first lifting pulley (14), and two first lifting pulleys (14) arranged on the same vertical axis are slidably mounted on a sliding rail; the slide rail is installed on the inner wall of box body (1).
5. The asphalt bending beam rheological test piece molding instrument according to claim 1, wherein the molding unit comprises a molding tray (4) and a pouring mold groove, wherein the molding tray (4) is slidably mounted on the height control unit; the plurality of casting grooves are uniformly distributed on the molding tray (4).
6. The asphalt bending beam rheological test piece molding instrument according to claim 5, wherein the pouring mold groove comprises a side plate (21), a lifting column (22), a rectangular groove body (23), an electromagnetic chuck (24) and a door closer (25), wherein mounting grooves are formed in two long side walls of the rectangular groove body (23); the number of the side plates (21) is two, and the two side plates are both arranged in the inner cavity of the rectangular groove body (23); two ends of the inner cavity of the rectangular groove body (23) are respectively provided with a lifting column (22);
the tops of two long side walls of the rectangular groove body (23) are uniformly provided with a plurality of electromagnetic suckers (24);
the fixed end of the door closer (25) is arranged on the mounting groove; the working end of the door closer (25) is arranged on the side plate (21).
7. The asphalt bending beam rheological test piece molding instrument according to claim 5, wherein a lifting pulley (31) is arranged at each of eight corners of the film forming tray (4), and the lifting pulley (31) is installed on the height control unit in a matching manner;
the lifting column (22) comprises a first telescopic column (2201) and a second telescopic column (2202), and the first telescopic column (2201) is sleeved on the second telescopic column (2202) and is in sliding connection with the second telescopic column;
an inner cavity is formed in the first telescopic column (2201), a fourth motor is installed in the inner cavity, and an output shaft of the fourth motor is connected with the second telescopic column;
the fourth motor is connected with a casting mold controller, and the rotating speed of the fourth motor is realized through the casting mold controller.
8. The asphalt bending beam rheological test piece molding instrument according to claim 1, wherein the scraping die unit comprises a scraper (33), a lifting slide rod (35), a displacement pulley (36) and an electric motor (37), wherein two ends of the scraper are respectively provided with one displacement pulley (36); each displacement pulley (36) is connected with a lifting slide bar (35) in a sliding way;
each lifting slide bar (35) is connected with a gear in a meshing way, the gear is sleeved on an output shaft of an electric motor (37), and the electric motor (37) is installed on the inner wall of the box body (1);
the two lifting slide bars (35) are connected with a height control unit;
the scraper is provided with a second heating wire (38) and a second temperature sensor (39), and the second temperature sensor (39) is used for collecting the temperature of the scraper and transmitting the collected temperature to the scraper controller; the scraping mould controller is used for controlling the heating power of the second heating wire (38) according to the received temperature; at the same time, the rotation rate of the electric motor (37) is controlled.
9. The asphalt bending beam rheological test piece molding instrument according to claim 1, wherein the demolding unit comprises a water tank tray (5), a refrigerating device (49), a temperature sensor (48) and an ejection column (8), wherein the water tank tray (5) is filled with absolute ethyl alcohol, and the refrigerating device (49) is arranged at the bottom of an inner cavity of the water tank tray (5); a third temperature sensor (48) is arranged on the inner side wall of the water tank tray (5);
the ejection column is of an L-shaped structure, and one end of the L-shaped structure is connected with an output shaft of a stepping motor (43); the other end of the L-shaped structure is fixed on the side wall of a lifting column (22) of the molding unit;
the third temperature sensor (48), the refrigeration equipment (49) and the stepping motor (43) are connected to the demoulding controller, wherein the third temperature sensor (48) is used for collecting the temperature of the inner cavity of the water tank tray (5) and transmitting the collected temperature to the demoulding controller; the demoulding controller is used for controlling the refrigerating power of the refrigerating equipment (49) according to the received temperature; at the same time, the rotation rate of the stepping motor (43) is controlled.
10. The test piece molding instrument for the asphalt bending beam rheological test according to claim 1, wherein the height control unit comprises two groups of chain rails, and the two groups of chain rails are respectively arranged on two inner walls of the box body (1) which are symmetrically arranged;
each set of chain tracks comprises a first chain track (15), a second chain track (47) and a third chain track, wherein the first chain track (15) is connected with a first motor (44) in a meshing manner; the second caterpillar track (47) is connected with a second motor (32) in a meshing manner; the third caterpillar track is connected with a third motor in a meshed mode;
two ends of a temperature control tray (12) of the temperature control unit are respectively connected with two first caterpillar tracks (15);
two ends of a film forming tray (4) of the molding unit are respectively connected with two second caterpillar tracks (47);
two lifting slide bars (35) of the mould scraping unit are respectively connected with two third chain rails;
the first motor (32), the second motor (47) and the third motor are all connected with a height controller; the height controller is for the rotational rate of the first motor (32), the second motor (47), and the third motor.
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| CN202011461954.4A CN112378731B (en) | 2020-12-10 | 2020-12-10 | Asphalt bending beam rheological test specimen forming instrument |
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