An asphalt mixture automatic test density instrument and a method of using the same

Abstract

A density meter for automatic testing of asphalt mixtures and its method of use. The density meter includes: a testing component, a replenishment component, and a lifting and wiping component; a weighing device is provided on the upper surface of its discharge platform, and the weighing device measures the mass m of the specimen outside the water storage tank. a The system selects between the first and second working modes; the working modes are suitable for asphalt mixtures with a water absorption rate of no more than 0.5% and no more than 2%; the weighing device measures the mass m of the specimen in the water tank. w The relative density γ was calculated. a Apparent density ρ a and water absorption rate S a relative density of hair volume γ f ρ of bulk density f The method of use is for using the density meter described above. This solution effectively solves the problems of high labor costs and errors that easily occur during repeated and multiple measurements in the existing testing process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of density meter, in particular to a density meter for automatic test of asphalt mixture and a use method thereof. BACKGROUND

[0002] Asphalt mixture is a mixture of mineral aggregate and asphalt binder, which is a composite material mainly composed of asphalt, coarse aggregate, fine aggregate, mineral powder, and sometimes polymer and wood cellulose. Different materials with different quality and quantity are mixed to form different structures and have different mechanical properties. Density is an important technical index of asphalt mixture. The current test methods mainly include surface drying method, water immersion method, wax sealing method and vacuum method. Currently, the surface drying method and water immersion method are used most frequently in the laboratory. However, each type of asphalt mixture requires more test specimens for density testing, and more density calculation methods are needed, which requires operators to perform frequent repetitive operations and calculations, thereby increasing the burden on operators. SUMMARY

[0003] The present application aims to provide a density meter for automatic test of asphalt mixture, which realizes automatic test of asphalt density through a test assembly, a supplement assembly and a lifting and wiping assembly, and can select the working mode of a weighing device according to needs, thereby measuring the relative density γ a , apparent density ρ a , water absorption S a , bulk volume relative density γ f , and bulk volume density ρ f .

[0004] The present application also provides a use method of the density meter for automatic test of asphalt mixture.

[0005] To achieve this purpose, the present application adopts the following technical solutions:

[0006] A density meter for automatic test of asphalt mixture, comprising: a test assembly, a supplement assembly and a lifting and wiping assembly.

[0007] The test assembly comprises: a water storage tank, an overflow tank, a discharge platform and a lifting drive column.

[0008] The opening of the overflow tank is located on the outside of the water storage tank, and the overflow tank is used to receive the overflow water from the water storage tank; the discharge platform is used to place test specimens; the lifting drive column is connected to the discharge platform and is used to drive the discharge platform to move up and down.

[0009] The supplement assembly comprises: a supplement water storage device and a water storage output pipe.

[0010] The supplementary water reservoir is arranged at one side of the water storage tank, the input end of the water storage output pipe is communicated with the output end of the supplementary water reservoir, and the output end of the water storage output pipe is directed to the opening of the water storage tank; the supplementary water reservoir is provided with a water level sensing device; the water level sensing device is used to identify that the water level of the water storage tank reaches the opening, and then the output end of the supplementary water reservoir is closed;

[0011] The lifting wiping assembly comprises a lifting main seat, a lifting driver and a wiping member.

[0012] The lifting driver is mounted on the lifting main seat, and the output end of the lifting driver is connected with the lifting driving column for driving the lifting driving column to move up and down, so that the test piece of the feeding platform is immersed in the water storage tank with the water level reaching the opening.

[0013] The upper surface of the feeding platform is provided with a scale, and the scale measures the mass m a of the test piece outside the water storage tank, and selects the first working mode and the second working mode;

[0014] The first working mode is suitable for asphalt mixture with a water absorption rate not greater than 0.5%, the scale measures the mass m w of the test piece in the water in the water storage tank, calculates the relative density γ a and the apparent density ρ a .

[0015] The second working mode is suitable for asphalt mixture with a water absorption rate not greater than 2%, the scale measures the mass m w of the test piece in the water in the water storage tank, the lifting driving column drives the feeding platform to rise to the position of the wiping member, the surface of the test piece is against the wiping member, the surface water of the test piece is removed, the scale measures the surface dry mass m f of the test piece, and calculates the water absorption rate S a , the bulk volume relative density γ w and the bulk volume density ρ f according to m a , m f and m f .

[0016] Preferably, the lifting wiping assembly comprises a wiping arc block and a wiping driver.

[0017] A plurality of wiping arc blocks are distributed around the upper surface of the feeding platform, and an arc side wall surface is arranged in the inner ring of the surrounding, the wiping member is mounted on the upper surface, the lower surface and / or the arc side wall surface of the wiping arc block, and the output end of each wiping driver is connected with one of the wiping arc blocks for driving the wiping arc block to move horizontally and reset.

[0018] Preferably, one of the output ends of the overflow tank is connected to one of the input ends of the supplementary water reservoir.

[0019] Preferably, the water storage tank is provided with a heating device.

[0020] Preferably, the wiping member is a towel.

[0021] Preferably, the inside of the discharging platform is provided with a first wire channel; the inside of the lifting driving column is hollow and provided with a second wire channel; the inside of the lifting main seat is provided with a third wire channel; the first wire channel, the second wire channel and the third wire channel are sequentially connected.

[0022] More preferably, the lifting main seat is provided with an operation table; the operation table is communicatively connected to the supplementary water reservoir, the lifting driver and the weighing device.

[0023] Preferably, the water level sensing device is an infrared sensing device; the sensing end of the infrared sensing device is horizontally aligned with the tank opening of the water storage tank; the water storage tank is made of transparent or translucent material.

[0024] Preferably, in the first working mode and / or the second working mode, the weighing device measures the mass m w of the test piece in water in the water storage tank multiple times, and calculates the variance of the obtained measurement values; if the variance exceeds a preset value, the measurement of the test piece is stopped; if the preset value is not exceeded, the mass m w of the test piece in water is measured.

[0025] A use method of an automatic asphalt mixture testing density instrument, which uses the automatic asphalt mixture testing density instrument described above, and is characterized by comprising the following steps:

[0026] Step (1): Start the density instrument, and the supplementary water reservoir starts to add water to the water storage tank, which is controlled by the water level sensing device to ensure that the water level of the water storage tank just reaches the tank opening;

[0027] Step (2): Put the asphalt mixture as a test piece into the discharging platform, and select the working mode; the weighing device of the discharging platform weighs the mass m a of the test piece; the working mode includes a first working mode and a second working mode;

[0028] The first working mode: the lifting driver drives the lifting driving column to descend, and drives the discharging platform to be completely immersed in the overflow tank, and after a period of time after reaching the set position, the weighing device measures the weight at intervals; the weighing device calculates the variance of multiple measurement values, and if the variance exceeds the preset value, the weighing device feeds back that the test piece is not suitable for this mode; the discharging platform is lifted to the initial position; if the variance does not exceed the preset value, the weight is measured once, and the mass m of the test piece in water is measured w ; the relative density γ a and the apparent density ρ w are calculated according to the mass m a and the mass m a ; γ a =m a ÷(m a -m w ), ρ a = γ a × ρ w ; ρ w is the density of water at the current temperature;

[0029] The second working mode: the lifting driver drives the lifting driving column to descend, and drives the discharging platform to be completely immersed in the overflow tank, and after a period of time after reaching the set position, the weighing device measures the weight at intervals; the weighing device calculates the variance of multiple measurement values, and if the variance exceeds the preset value, the weighing device feeds back that the test piece is not suitable for this mode; the discharging platform is lifted to the initial position; if the variance does not exceed the preset value, the weight is measured once, and the mass m of the test piece in water is measured w ;

[0030] The lifting driver drives the lifting driving column to ascend, and drives the discharging platform to be lifted upward until the opening formed by the plurality of wiping arc blocks, the upper portion of the opening and / or the lower portion of the opening; the wiping driver drives the wiping arc blocks to move, so that the wiping member of the wiping arc blocks moves to the side surface, the upper surface and / or the lower surface of the test piece multiple times; the discharging platform is lowered to the initial position, and the weighing device measures the test piece to obtain m f ; according to the results of m a , m w and m f , and the formula S a =(m f -m a )×% / (m f -m w ), γ f =m a ÷(m f -m w ), ρ f = γ f × ρ w , the water absorption rate S of the asphalt mixture is calculateda bulk volume relative density γ f ; p w is the density of water at the current temperature.

[0031] The technical scheme provided by the present application can include the following beneficial effects:

[0032] The present application provides a density instrument for automatic testing of asphalt mixture, which realizes automatic testing of asphalt density through a testing assembly, a supplement assembly and a lifting and wiping assembly, and can select the working mode of the weighing device according to the needs, thereby measuring the relative density γ a , apparent density p a , water absorption S a , bulk volume relative density γ f , bulk volume density p f , effectively solving the problems of high labor cost, easy errors in repeated and multiple measurements in the testing process of the existing testing instrument. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is a structural schematic diagram of one embodiment of the density instrument;

[0034] Figure 2 is a top view structural schematic diagram of one embodiment of the lifting and wiping assembly.

[0035] Among them:

[0036] Testing assembly 1, supplement assembly 2, lifting and wiping assembly 3; test piece 9;

[0037] Water storage tank 11, overflow tank 12, discharge platform 13, lifting drive column 14; weighing device 15; heating device 16;

[0038] Supplement water storage device 21, water storage output pipe 22; water level sensing device 23;

[0039] Lifting main seat 31, lifting driver 32, wiping member 33; wiping arc block 34, wiping driver 35; operation table 311; arc side wall surface 341;

[0040] First wiring channel 41, second wiring channel 42; third wiring channel 43. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0042] In the description of the present application, it needs to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0043] The technical solutions of the present application will be further described below by specific embodiments in conjunction with the drawings.

[0044] An asphalt mixture automatic test density instrument, comprising: a test assembly 1, a supplement assembly 2 and a lifting and wiping assembly 3;

[0045] The test assembly 1 comprises: a water storage tank 11, a water overflow tank 12, a discharge platform 13 and a lifting drive column 14;

[0046] The opening of the water overflow tank 12 is located outside the water storage tank 11, and the water overflow tank 12 is used to receive the overflow water of the water storage tank 11; the discharge platform 13 is used to place the test piece 9; the lifting drive column 14 is connected to the discharge platform 13 and is used to drive the discharge platform 13 to move up and down;

[0047] The supplement assembly 2 comprises: a supplement water storage device 21 and a water storage output pipe 22;

[0048] The supplement water storage device 21 is arranged on one side of the water storage tank 11, the input end of the water storage output pipe 22 is communicated with the output end of the supplement water storage device 21, and the output end of the water storage output pipe 22 is directed towards the opening of the water storage tank 11; the supplement water storage device 21 is provided with a water level sensing device 23; the water level sensing device 23 is used to identify that the water level of the water storage tank 11 reaches the tank opening, and then close the output end of the supplement water storage device 21;

[0049] The lifting and wiping assembly 3 comprises: a lifting main seat 31, a lifting driver 32 and a wiping member 33;

[0050] The lifting driver 32 is installed on the lifting main base 31, and the output end of the lifting driver 32 is connected to the lifting driving column 14, for driving the lifting driving column 14 to move up and down, so that the test piece 9 of the feeding platform 13 is immersed in the water in the water storage groove 11;

[0051] The upper surface of the feeding platform 13 is provided with a weighing device 15, which measures the mass m of the test piece 9 outside the water storage groove 11 a , and selects the first working mode and the second working mode;

[0052] The first working mode is suitable for asphalt mixture with water absorption rate not greater than 0.5%; the weighing device 15 measures the mass m of the test piece 9 in the water in the water storage groove 11 w , calculates the relative density γ a and the apparent density ρ a ;

[0053] The second working mode is suitable for asphalt mixture with water absorption rate not greater than 2%; the weighing device 15 measures the mass m of the test piece 9 in the water in the water storage groove 11 w , the lifting driving column 14 drives the feeding platform 13 to rise to the position of the wiping member 33, the surface of the test piece 9 is against the wiping member 33, the surface water of the test piece 9 is removed, the weighing device 15 measures the surface dry mass m f of the test piece 9, and calculates the water absorption rate S a , the bulk volume relative density γ w , and the bulk volume density ρ f according to m a , m f , and m f .

[0054] The scheme provides a density instrument for automatic testing of asphalt mixture, which realizes automatic testing of asphalt density through a testing assembly 1, a supplement assembly 2 and a lifting and wiping assembly 3, and can select the working mode of the weighing device 15 according to needs, so as to measure the relative density γ a , the apparent density ρ a , the water absorption rate S a , the bulk volume relative density γ f , and the bulk volume density ρ f of the test piece 9, and effectively solves the problems of large labor cost, and easy errors in repeated and multiple measurements in the testing process of the existing testing instrument.

[0055] Specifically, the water storage tank 11 stores water, and the overflow tank 12 is used to receive water overflowing from the upper water storage tank 11. When a density meter is needed, the specimen 9 can be placed on the discharge platform 13. Specifically, asphalt mixture can be used as the specimen 9 and placed on the discharge platform 13. The input end of the supplementary water reservoir 21 can be connected to a water source, and its output end outputs water to the water storage output pipe 22. The water storage output pipe 22 then adds water to the water storage tank 11, ensuring that the water level in the water storage tank 11 rises to the opening position of the water storage tank 11. Under this constraint, it can be ensured that the volume of water overflowing from the opening position of the water storage tank 11 is the same as the volume of the specimen 9, so that it can be omitted in subsequent calculations, thereby simplifying the formula and making the result more accurate. Subsequently, the staff can select the first working mode and the second working mode as needed. When the first working mode is selected, this mode is suitable for asphalt mixtures with a water absorption rate of no more than 0.5%. The weighing device 15 weighs the mass m of the specimen 9. a The lifting drive 32 is activated, causing the lifting drive column 14 to descend and move, thereby causing the material discharge platform 13 of the lifting drive column 14 to extend into the water storage tank 11, causing water in the water storage tank 11 to overflow; after the asphalt mixture reaches the set position, it is immersed in water for a period of time, for example, 5 minutes; at this time, the weighing device 15 measures the mass m of the specimen 9 in the water in the water storage tank 11. w And according to mass m a and mass m w Calculate the relative density γ a and apparent density ρ a ;γ a =m a ÷(m a -m w ), ρ a =γ a ×ρ w ;ρ w The density of water at 25℃ is generally taken as 0.9971 g / cm³. 3 When the second working mode is selected, this mode is suitable for asphalt mixtures with a water absorption rate of no more than 2%; weighing device 15 weighs the specimen 9 by mass m. a The lifting drive 32 is activated, causing the lifting drive column 14 to descend and move, thereby causing the material discharge platform 13 of the lifting drive column 14 to extend into the water storage tank 11, causing water in the water storage tank 11 to overflow; after the asphalt mixture reaches the set position, it is immersed in water for a period of time, for example, 5 minutes; at this time, the weighing device 15 measures the mass m of the specimen 9 in the water in the water storage tank 11. w; subsequently, the lifting driver 32 is started again, driving the lifting driving column 14 to move upward, so that the asphalt mixture on the discharging platform 13 is against the wiping member 33, which can contact the surface of the asphalt mixture, thereby adsorbing or taking away the water on the surface of the asphalt mixture, to wipe off the water in the voids on the surface of the asphalt. The lifting driver 32 drives the discharging platform 13 to reset, and the weighing device 15 measures the surface-dry mass m f , and then the water absorption rate S of the asphalt mixture is calculated again a , the relative bulk density γ f ; S a =(m f -m a )×100% / (m f -m w ), γ f =m a ÷(m f -m w ), ρ f =γ f ×ρ w , ρ w is the density of water at 25℃, generally taken as 0.9971g / cm 3 .

[0056] Wherein, the lifting driver 32 is a mechanism with lifting function, such as a cylinder, or a combination of a screw rod and a motor, etc. The water level sensing device 23 is an industrial camera, an infrared sensing device or a laser recognition device, etc., which can recognize whether the liquid level of the water storage tank 11 is in the slot, and stop water adding if yes.

[0057] Preferably, the lifting wiping assembly 3 comprises: a wiping arc block 34 and a wiping driver 35.

[0058] A plurality of the wiping arc blocks 34 are distributed around the upper side of the discharging platform 13, and are provided with arc side walls 341 at the inner ring of the distribution; the wiping member 33 is installed on the upper surface, the lower surface and / or the arc side walls 341 of the wiping arc block 34; the output end of each wiping driver 35 is connected to one of the wiping arc blocks 34, for driving the wiping arc block 34 to move horizontally and reset.

[0059] The lifting driver 32 can drive the lifting driving column 14 to move up and down, so as to drive the discharging platform 13 to rise to abut against the wiping member 33 of the wiping arc block 34; the wiping member 33 can be arranged on the upper surface, the lower surface and / or the arc side wall surface 341 of the wiping arc block 34 according to the requirement; when the asphalt mixture rises to the opening of the wiping member 33 distributed in a ring shape, one or more wiping drivers 35 can be started, the wiping driver 35 drives the wiping arc block 34 to move to the center of the inner ring, so as to drive the wiping arc block 34 to move to the asphalt mixture, the side of the asphalt mixture can be wiped through the arc side wall surface 341 of the inner ring, so as to remove the moisture on the side; meanwhile, one or more wiping members 33 can be driven by the wiping driver 35 to be arranged above the asphalt mixture before the asphalt mixture rises, the wiping member 33 arranged on the lower surface of the wiping arc block 34 can remove the moisture on the upper surface of the asphalt mixture; the wiping driver 35 can be started after the asphalt mixture rises, the wiping driver 35 drives the wiping arc block 34 to move horizontally, the wiping member 33 arranged on the upper surface of the wiping arc block 34 can contact the lower surface of the asphalt mixture, and the wiping member 33 can remove the moisture on the lower surface of the asphalt mixture; the wiping member 33 can abut against the side of the asphalt mixture, and the discharging platform can continue to rise, so that the relative displacement between the asphalt mixture and the wiping member 33 is generated; thus, the wiping arc block 34 in the scheme can remove the moisture on multiple surfaces of the asphalt mixture in combination with the wiping member 33, so as to calculate the water absorption rate S of the asphalt mixture a , the bulk relative density γ f . Moreover, the output end of the wiping driver 35 can move in a reset manner, so that the wiping member 33 can be driven by the wiping arc block 34 to wipe the surface of the asphalt mixture multiple times, the moisture can be removed more completely, and the calculation result is more accurate. The arc side wall surface 341 formed between the wiping arc blocks 34 can wipe the asphalt mixture at an angle of 360°, the moisture can be removed more completely, and the calculation result is more accurate.

[0060] Preferably, one output end of the overflow tank 12 is communicated with one input end of the supplementary water storage device 21.

[0061] The water overflowed from the water storage tank 11 falls to the overflow tank 12, and the water stored in the overflow tank 12 can be returned to the supplementary water storage device 21 through the pipeline in cooperation with the pump body or under the action of gravity when the water storage reaches a certain degree, so that the part of the water is recycled; thus, the overflow tank 12 can provide the water storage function for the whole density instrument, and the water storage capacity of the system is further improved, and an additional water source is not needed; after all, pure water is often needed in the test process, and thus the test cost can be greatly reduced when the water can be recycled.

[0062] Preferably, the water storage tank 11 is provided with a heating device 16.

[0063] The heating device 16 has a heating function, which can be used to heat the water in the water tank 11 to a certain temperature (for example, 25°C), so as to ensure that the ρ w of the water before the test is close to the theoretical value, for example, at 25°C, ρ w is 0.9971 g / cm 3 . The heating device 16 is a known mechanism with a heating function, such as an electric resistance heating device 16, an electromagnetic heating device 16, etc.

[0064] Preferably, the wiping member 33 is a towel.

[0065] The wiping member 33 can be a known material with a water absorption function; the present scheme preferably uses a towel as the wiping member 33, which is generally a pure cotton textile with the characteristics of fluffy loops and soft texture, and has soft contact with the asphalt mixture, which can reduce the wear on the surface of the asphalt mixture, thereby avoiding damage to the surface structure of the test piece 9 and affecting the weighing. At the same time, when the material is a towel, the wiping member 33 can move horizontally and be reset, and the water removal effect is better; and the towel can also be appropriately wetted, which can greatly reduce the mechanical strength of the towel surface, and the water removal effect is good and the wear is minimal.

[0066] Preferably, the inside of the feeding platform 13 is provided with a first wire channel 41; the inside of the lifting drive column 14 is hollow and provided with a second wire channel 42; the inside of the lifting main seat 31 is provided with a third wire channel 43; the first wire channel 41, the second wire channel 42 and the third wire channel 43 are sequentially communicated.

[0067] The first wire channel 41, the second wire channel 42 and the third wire channel 43 can be used for wiring, and the wires can be led from the feeding platform 13 to the lifting main seat 31 through the lifting drive column 14, so as to wire between the test assembly 1 and the lifting wiping assembly 3, and avoid the wires exposed.

[0068] More preferably, the lifting main seat 31 is provided with an operation table 311; the operation table 311 is communicatively connected to the supplementary water storage device 21, the lifting driver 32 and the weighing device 15.

[0069] The operation table 311 can be used to control the supplementary water storage device 21, the lifting driver 32 and the weighing device 15, so as to automatically perform the density test by one key control, thereby improving the test efficiency. At the same time, the lifting driver 32 and the weighing device 15 can be connected to the operation table 311 through wires, and the wires involved can be wired along the first wire channel 41, the second wire channel 42 and the third wire channel 43, which is more convenient for wiring, and no wires are exposed on the outer surface.

[0070] Preferably, the water level sensing device 23 is an infrared sensing device; the sensing end of the infrared sensing device is horizontally aligned with the slot of the water storage tank 11; the water storage tank 11 is made of transparent or translucent material.

[0071] The infrared sensing device can be used to detect whether the water level of the water storage tank 11 is at the slot, and the sensing end of the infrared sensing device is horizontally aligned with the slot of the water storage tank 11. When the water level is horizontally aligned with the sensing end, the infrared sensing device will feedback to the supplementary water reservoir 21, and the supplementary water reservoir 21 controls the valve of the water storage output pipe 22 to be closed, so that the water level is controlled at the slot position. The water storage tank 11 made of transparent or translucent material can facilitate the sensing end of the infrared sensing device to perform feature recognition, and a light source can be provided beside the water storage tank 11 to increase brightness according to needs, which can facilitate the display of the shadow of the liquid level on the side wall of the translucent water storage tank 11.

[0072] More preferably, in the first working mode and / or the second working mode, the weighing device 15 measures the mass m w Before measuring the mass m w of the test piece 9 in water, the weighing device 15 first measures the mass of the test piece 9 in water multiple times, and calculates the variance of the obtained measurement values. If the variance exceeds a preset value, the measurement of the test piece 9 is stopped. If the variance does not exceed the preset value, the mass m w of the test piece 9 in water is measured by weighing.

[0073] Before measuring the mass m w of the test piece 9 in water, the present scheme will adaptively detect the test piece 9 to determine whether the current asphalt mixture is suitable for detection using the working mode. Specifically, the mass of the test piece 9 in water is measured within a specific time interval, and multiple repeated detections are performed to determine whether the mass of the asphalt mixture in water is stable through variance. When the variance is large, it indicates that the asphalt mixture is still in the water absorption state after being soaked for a specific time. The specific time is a standard value, i.e., the time required for a certain asphalt mixture to reach a stable water absorption rate. When the mass continues to change after soaking for the standard soaking time, it indicates that the mass continues to change beyond the standard water absorption rate, and therefore the measurement of the test piece 9 needs to be stopped.

[0074] A method for using an automatic asphalt mixture testing density instrument, which uses the automatic asphalt mixture testing density instrument described above, comprising the following steps:

[0075] Step (1): Start the density instrument, and the supplementary water reservoir 21 starts to add water to the water storage tank 11, which is controlled by the water level sensing device 23 to ensure that the water level of the water storage tank 11 just reaches the slot;

[0076] Step (2): Put the asphalt mixture as test piece 9 into the discharging platform 13, and select the working mode; the weighing device 15 of the discharging platform 13 weighs the mass m of the test piece 9 a ; the working mode includes a first working mode and a second working mode;

[0077] First working mode: the lifting driver 32 drives the lifting driving column 14 to descend, and drives the discharging platform 13 to be completely immersed in the overflow tank 12 downwards, and after a period of time after reaching the set position, the weighing device 15 measures the weight at intervals; the weighing device 15 calculates the variance of multiple measurement values, if the variance exceeds the preset value, the weighing device 15 feeds back that the test piece 9 is not suitable for this mode; the discharging platform 13 is lifted to the initial position; if the variance does not exceed the preset value, the weight is measured, and the mass m of the test piece 9 in water is measured w ; the relative density γ a and the apparent density ρ w are calculated according to the mass m a and the mass m a ; γ a = m a ÷ (m a -m w ), ρ a = γ a × ρ w ; ρ w is the density of water at the current temperature;

[0078] Second working mode: the lifting driver 32 drives the lifting driving column 14 to descend, and drives the discharging platform 13 to be completely immersed in the overflow tank 12 downwards, and after a period of time after reaching the set position, the weighing device 15 measures the weight at intervals; the weighing device 15 calculates the variance of multiple measurement values, if the variance exceeds the preset value, the weighing device 15 feeds back that the test piece 9 is not suitable for this mode; the discharging platform 13 is lifted to the initial position; if the variance does not exceed the preset value, the weight is measured, and the mass m of the test piece 9 in water is measured w ;

[0079] The lifting driver 32 drives the lifting driving column 14 to ascend, and drives the discharging platform 13 to ascend upwards until the opening formed by the plurality of wiping arc blocks 34, the upper portion of the opening and / or the lower portion of the opening; the wiping driver 35 drives the wiping arc blocks 34 to move, so that the wiper 33 of the wiping arc blocks 34 moves to the side surface, the upper surface and / or the lower surface of the test piece 9 multiple times; the discharging platform 13 is lowered to the initial position, and the weighing device 15 measures the test piece 9 to obtain m f ; according to the results of m a , m w and m f , and the formula S a = (m f -ma ) x 100% / (m f -m w ), γ f = m a ÷ (m f -m w ), p f = γ f x p w The water absorption rate S of the asphalt mixture is calculated a , the bulk relative density γ f ; p w is the density of water at the current temperature.

[0080] The technical principles of the present scheme are described above in combination with specific embodiments. These descriptions are only for the purpose of explaining the principles of the present scheme, and cannot be interpreted in any way as a limitation on the scope of protection of the present scheme. Based on the explanations here, those skilled in the art can think of other specific embodiments of the present scheme without having to exert creative labor, and these ways will all fall within the scope of protection of the present scheme.

Claims

1. An automatic testing density gauge for asphalt mixtures, characterized in that, The test assembly, the replenishment assembly and the lifting wiping assembly are included. The test assembly includes a water storage tank, a water overflow tank, a sample placing platform and a lifting driving column. The opening of the water overflow tank is located outside the water storage tank, and the water overflow tank is used to receive the water overflowed from the water storage tank. The sample placing platform is used to place a test sample. The lifting driving column is connected to the sample placing platform and is used to drive the sample placing platform to move up and down. The replenishment assembly includes a replenishment water storage device and a water storage output pipe. The replenishment water storage device is arranged on one side of the water storage tank. The input end of the water storage output pipe is communicated with the output end of the replenishment water storage device. The upper surface of the feeding platform is provided with a scale, which measures the mass m of the test piece outside the water storage tank a and select into the first working mode and the second working mode; The first working mode is suitable for asphalt mixture with water absorption not more than 0.5%; the weighing device measures the mass m of the test piece in water in the water storage tank w , the relative density γ a and the apparent density ρ a are calculated; The second working mode is suitable for asphalt mixture with water absorption not more than 2%; the weighing device measures the mass m of the test piece in water in the water storage tank w The lifting driving column drives the feeding platform to ascend to the position of the wiping member, the surface of the test piece is against the wiping member, the water on the surface of the test piece is removed, and the weighing device measures the surface dry mass m of the test piece f The water absorption S a , the relative bulk density γ f , and the bulk density ρ f are calculated according to m w , m f , and m a ​ The output end of the water storage output pipe is directed to the opening of the water storage tank. The replenishment water storage device is provided with a water level sensing device. The water level sensing device is used to identify that the water level of the water storage tank reaches the opening of the water storage tank.

2. The automatic density gauge for asphalt mixture testing according to claim 1, characterized in that, The lifting wiping assembly includes a lifting main seat, a lifting driver and a wiping member.

3. The automatic density gauge for asphalt mixture testing according to claim 1, characterized in that, The lifting driver is installed on the lifting main seat.

4. The automatic density gauge for asphalt mixture testing according to claim 1, wherein, The output end of the lifting driver is connected to the lifting driving column and is used to drive the lifting driving column to move up and down.

5. The automatic asphalt mixture testing density gauge of claim 4, wherein, The lifting wiping assembly includes a wiping arc block and a wiping driver.

6. The automatic density gauge for asphalt mixture testing according to claim 1, wherein, A plurality of wiping arc blocks are distributed around the upper side of the sample placing platform.

7. The automatic density gauge for asphalt mixture testing according to any one of claims 1-6, characterized in that, In the first mode and / or the second mode, the weighing device measures m w Before the weighing measurement, the weighing device measures the mass of the test piece in the water tank multiple times, and calculates the variance of the measured values. If the variance exceeds a preset value, the measurement of the test piece is stopped. If the variance does not exceed the preset value, the weighing measurement is performed to obtain the mass m w of the test piece in the water.

8. A method of using an automatic testing density gauge for asphalt mixtures, characterized in that, The wiping member is installed on the upper surface, the lower surface and / or the arc side wall surface of the wiping arc block. The output end of each wiping driver is connected to one of the wiping arc blocks and is used to drive the wiping arc block to move horizontally and reset. One of the output ends of the water overflow tank is communicated with one of the input ends of the replenishment water storage device. The water storage tank is provided with a heating device. The wiping member is a towel. The inside of the sample placing platform is provided with a first wire channel. The inside of the lifting driving column is hollow and is provided with a second wire channel. The inside of the lifting main seat is provided with a third wire channel. The first wire channel, the second wire channel and the third wire channel are sequentially communicated. The lifting main seat is provided with an operation table. The operation table is communicatively connected to the replenishment water storage device, the lifting driver and a weighing device. The water level sensing device is an infrared sensing device. The sensing end of the infrared sensing device is horizontally aligned with the opening of the water storage tank. The water storage tank is made of transparent or translucent material. The density instrument for automatically testing asphalt mixture according to any one of claims 1-7 is used, and the density instrument includes the following steps: Step (1): Start the density instrument, and the replenishment water storage device starts to add water to the water storage tank. The water level sensing device is used to control the water level of the water storage tank to reach the opening. Step (2): Put the asphalt mixture as a test piece into the discharging platform, and select a working mode; the weighing device of the discharging platform weighs the mass m of the test piece a ; the working mode includes a first working mode and a second working mode; First working mode: The lifting drive unit lowers the lifting drive column, causing the material feeding platform to be fully immersed in the overflow tank. After reaching the set position, the weighing device performs a weighing measurement at regular intervals. The weighing device calculates the variance of multiple measurements. If the variance exceeds the preset value, the weighing device reports that the specimen is not suitable for this mode. The material feeding platform is then raised to the initial position. If the variance does not exceed the preset value, a weighing is performed to measure the mass m of the specimen in water. w According to mass m a and mass m w Calculate the relative density γ a and apparent density ρ a ;γ a =m a ÷ (m) a -m w ), ρ a =γ a ×ρ w ;ρ w The density of water at the current temperature; Second working mode: the lifting driver drives the lifting driving column to descend, and drives the discharging platform to be completely immersed in the overflow tank, and after a period of time after reaching the set position, the weighing device measures the weight at intervals; the weighing device calculates the variance of multiple measurement values, and if the variance exceeds the preset value, the weighing device feeds back that the test piece is not suitable for this mode; the discharging platform is lifted to the initial position; if the variance does not exceed the preset value, the weight is measured once, and the mass m of the test piece in water is measured w ​ The lifting driver drives the lifting driving column to rise, and drives the discharging platform to rise upwards until the opening surrounded by the plurality of wiping arc blocks, the upper and / or lower of the opening; the wiping driver drives the wiping arc blocks to move, so that the wiping member of the wiping arc blocks moves to the side surface, upper surface and / or lower surface of the test piece for multiple times of resettable movement; the discharging platform is lowered to the initial position, and the tester measures the test piece to obtain m f ; according to the results of m a , m w and m f , and the formula S a = (m f -m a ) x % / (m f -m w ), γ f =m a ÷ (m f -m w ), ρ f = γ f x ρ w , the water absorption rate S a of the asphalt mixture and the bulk relative density γ f are calculated; ρ w is the density of water at the current temperature.

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