CN111198148A - High-precision asphalt penetration tester - Google Patents
High-precision asphalt penetration tester Download PDFInfo
- Publication number
- CN111198148A CN111198148A CN202010019036.XA CN202010019036A CN111198148A CN 111198148 A CN111198148 A CN 111198148A CN 202010019036 A CN202010019036 A CN 202010019036A CN 111198148 A CN111198148 A CN 111198148A
- Authority
- CN
- China
- Prior art keywords
- measuring
- needle
- measuring rod
- rod
- asphalt
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
- G01N11/10—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material
- G01N11/12—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material by measuring rising or falling speed of the body; by measuring penetration of wedged gauges
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
- G01N2011/0006—Calibrating, controlling or cleaning viscometers
- G01N2011/002—Controlling sample temperature; Thermal cycling during measurement
Abstract
A high-precision asphalt penetration tester. The device comprises a rack, a measuring rod and measuring needle module, an up-down walking module, a sample placing module and a control module, wherein the measuring rod and measuring needle module comprises a connecting seat, a measuring rod and measuring needle bracket, a measuring rod and a measuring needle; the measuring rod is of a columnar structure and comprises a counterweight part, a main body part and a clamping part from top to bottom; the measuring rod and measuring needle support is fixedly provided with an air bearing sleeve structure, a measuring rod hole is formed in the center of the air bearing sleeve structure, and a cylinder cavity is arranged at the middle lower position of the bearing sleeve structure; the lower end of the measuring rod is provided with a load sensor; the sample placing module is provided with an electronic refrigerating sheet. This tester adopts air bearing structure and pneumatic clamping structure to reduce contact friction, adopts force cell sensor to realize automatic to the needle, adopts laser displacement sensor to realize contactless measurement, adopts the electron refrigeration piece to realize accurate constant temperature for pitch needle penetration index performance detection precision is high, and convenient operation, and degree of automation is high.
Description
Technical Field
The invention relates to asphalt penetration performance detection equipment, in particular to an asphalt penetration tester which adopts an air bearing structure and a pneumatic clamping structure to reduce contact friction, adopts a force transducer to realize automatic needle alignment, adopts a laser displacement sensor to realize non-contact measurement, adopts an electronic refrigeration sheet to realize accurate constant temperature and ensures that the asphalt penetration index performance detection precision is high.
Background
The penetration of asphalt is one of the main quality indexes of asphalt, and is an index which represents the softness and hardness degree and the consistency of the asphalt, and the capability of resisting shear failure and reflects the relative viscosity of the asphalt under certain conditions.
Currently, there are three representative evaluation systems for road asphalt worldwide, namely, penetration grading system, viscosity grading system, and PG grading system.
The penetration grading system of road asphalt determines the climatic conditions and loading conditions of asphalt according to the penetration of the asphalt. The main body of the penetration grading system is the well-known tensile (ductility), prick (penetration) and drop (softening point), and is assisted by the safety index flash point of the asphalt, the purity index solubility of the asphalt, the anti-aging performance index film oven test of the asphalt, the constraint index wax content of crude oil used for producing the asphalt and the like, so that the penetration grading system of the asphalt is formed.
In penetration grading systems, the asphalt penetration test is the standard method for determining the consistency of asphalt. The penetration of 25 ℃ gives the consistency of asphalt close to the average annual service temperature, and research results show that severe pavement cracking occurs when the penetration of asphalt at 25 ℃ is reduced to below 20, and the asphalt has high cracking resistance when the penetration is more than 30. The ductility of the asphalt is related to the pavement performance of the asphalt, and researches show that when the ductility at 13 ℃ is less than 5cm, the temperature shrinkage crack of the road is greatly increased. In addition, it has been confirmed that when the penetration of the asphalt is 30 to 50, the asphalt having the same penetration has poor workability with a small ductility and a large specific ductility. It has also been found that there is increasing evidence that ductility testing of recycled asphalt through the use of road surfaces is an important method of determining the performance of asphalt. The properties of recycled asphalt on the surface of 53 highways in the united states have shown that severe loosening occurs in cold weather when ductility drops to 3cm or less at 16 ℃. It can be seen that the ductility of asphalt, particularly the low temperature ductility of asphalt, can reflect the cracking resistance of asphalt. In the penetration grading system, the high-temperature performance of the asphalt is characterized by the softening point of the asphalt, and the higher the softening point is, the better the high-temperature performance of the asphalt is at the same penetration.
Even though many indexes in the penetration grading system are empirical and conditional, the method and the used instruments are relatively simple and easy to popularize, and can meet the requirements on asphalt quality control to a certain extent, the current standards of the countries such as the United states, European Union, Australia, Japan and the like still keep the penetration grading system, and the road asphalt grading system of China is established according to the specific conditions of China on the basis of the penetration grading system, can basically meet the control on the asphalt quality, particularly can meet the technical indexes that the ductility at 15 ℃ is more than 100 and the wax content is less than 3 percent, effectively realizes the restriction on the crude oil for producing the asphalt, ensures the potential quality of the asphalt, but the existing asphalt penetration detection device still has the defects:
1. the traditional equipment adopts a manual mode for zero setting of a probe, slowly puts down a probe connecting rod, radiates and observes by a reflector or light at a proper position to ensure that a needle point is just contacted with the surface of an asphalt sample, and then resets and clears a displacement indicator, wherein the measurement precision is low by a method of observing by human eyes, the manual operation error is large, and the manual interpretation is inaccurate;
2. the traditional equipment loading connecting rod and the displacement sensor are in contact type mechanical connection, the loading connecting rod and the weight are pressed down by the dead weight in the loading process during testing, the loading connecting rod is supported by the guide sleeve, friction force exists between the connecting rod and the guide sleeve, the loading precision is directly influenced, and meanwhile, a load monitoring and reading device is not arranged, so that whether the loaded load meets the requirement or not cannot be ensured;
3. before the test, the loading connecting rod is pressed by a mechanical spring locking block, the locking block is dragged to move by an electromagnet connected to the locking block during the test, the loading connecting rod and a counterweight of the loading connecting rod are released to apply load to the measuring needle, and the precision of the load and the displacement can also be influenced by adopting a mechanical locking device;
4. asphalt is very sensitive to temperature, the traditional equipment generally adopts the constant temperature of manually regulated water temperature or external constant temperature water bath to make water constant and then circulates into a sample water tank through a water pump, the asphalt penetration test usually adopts the temperature of 5 ℃, 15 ℃, 25 ℃ and 30 ℃ to carry out the test, the environmental temperature of a laboratory is basically about 22 ℃, and the temperature of the sample water tank cannot be controlled within the range of +/-0.1 ℃ by adopting simple temperature regulation.
Disclosure of Invention
The invention aims to solve the technical problems and provides a high-precision asphalt penetration tester which adopts an air bearing structure and a pneumatic clamping structure to reduce contact friction, adopts a force transducer to realize automatic needle alignment, adopts a laser displacement sensor to realize non-contact measurement, and adopts an electronic refrigeration sheet to realize precise constant temperature, so that the asphalt penetration index performance detection precision is high, and meanwhile, the operation is convenient and the automation degree is high.
The technical scheme of the invention is as follows:
a high-precision asphalt penetration tester comprises a rack, a measuring rod and measuring pin module, an up-down walking module, a sample placing module and a control module, wherein the rack comprises a first platen and a second platen which are horizontally arranged, and a rear supporting plate which is vertically arranged at the rear end of the first platen; the up-down walking module comprises a first bearing seat and a second bearing seat which are fixed on the rear supporting plate, a lead screw which is rotatably arranged between the first bearing seat and the second bearing seat through a bearing sleeve, and an up-down moving servo motor which is fixed below the first bearing seat, the up-down moving servo motor comprises an output shaft, the lead screw penetrates through the first bearing seat, the lower end of the lead screw is connected with the output shaft, the measuring rod and measuring needle module comprises a connecting seat which is sleeved on the lead screw through an internal thread structure, a measuring rod and measuring needle support which is fixed in front of the connecting seat, a measuring rod and a measuring needle, the connecting seat is movably arranged on the lead screw in a left-right limiting mode, the connecting seat and the measuring rod and measuring needle support are driven to move up and down through the rotation of the lead screw, the measuring rod and measuring needle support is provided with, The control module comprises a main control circuit board arranged at the front end of the first bedplate, a touch industrial control computer fixedly arranged on one side of the frame, a power supply button, an upward regulating switch and a downward regulating switch, the main control circuit board is electrically connected with an up-and-down moving servo motor, the main control circuit board is connected with the touch industrial control computer, the touch industrial control computer is at least provided with an asphalt needle penetration control program, and the asphalt needle penetration control program at least comprises a self-checking program;
as an improvement, the measuring rod is of a columnar structure and comprises a counterweight part, a main body part and a clamping part from top to bottom, and the diameter of the main body part is larger than that of the counterweight part and that of the clamping part;
as an improvement, an air bearing sleeve structure is fixedly arranged at the front lower part of a middle bedplate of the measuring bar measuring pin bracket, a measuring rod hole with the diameter slightly larger than that of the main body part of the measuring rod is formed in the center of the air bearing sleeve structure, a cylinder cavity is arranged at the middle lower part of the bearing sleeve structure, a through hole with the diameter larger than that of the measuring rod is formed at the position of the middle bedplate corresponding to the measuring rod, the measuring rod penetrates through the middle bedplate, the measuring rod hole and the cylinder cavity, the measuring rod clamping part is positioned at the central position of the cylinder cavity, because the diameter of the clamping part of the measuring rod is smaller than that of the main body part of the measuring rod, the measuring rod can be jacked upwards by inflating the cylinder cavity, the middle position of the air bearing sleeve structure is also provided with an air guide groove with an opening end close to the measuring rod, compressed air enters the air bearing sleeve structure through the air guide groove, and the measuring rod is supported in the middle of the measuring rod hole in a suspension manner through gas pressure;
as an improvement, a measuring point adjusting screw is arranged at the upper end of the measuring rod counterweight part, the upper end surface of the measuring point adjusting screw is a laser measuring point surface, the up-down position of the laser measuring point surface can be adjusted by rotating the measuring point adjusting screw, and a laser displacement sensor is further arranged on the measuring rod measuring pin support which is upward away from the measuring point adjusting screw by a certain distance;
as an improvement, the clamping part of the measuring rod downwards penetrates through the cavity of the cylinder, the lower end of the clamping part is provided with a load sensor, and the measuring needle is connected to the lower end of the load sensor;
as an improvement, an electronic refrigerating sheet for controlling the temperature through computer software is arranged on the inner wall of the constant-temperature water tank of the sample placing module, so that the temperature in the constant-temperature water tank is kept constant;
as an improvement, the air guide groove and the cylinder cavity are respectively connected with an air compressor through air guide pipes, and the air guide pipe connecting the cylinder cavity and the air compressor is also provided with an electromagnetic valve;
as an improvement, the main control circuit board is also electrically connected with the electromagnetic valve, the air compressor, the laser displacement sensor, the load sensor and the electronic refrigeration piece respectively, and the electromagnetic valve, the air compressor, the laser displacement sensor, the load sensor and the electronic refrigeration piece are controlled through the main control circuit board.
Further, the bottom of the frame is provided with a leveling foot margin;
furthermore, the first bearing seat and the second bearing seat are respectively provided with a lower limiting button and an upper limiting button.
The high-precision asphalt penetration tester comprises the following operation processes:
(1) pouring the heated asphalt sample into a sample cup, and placing the sample cup at room temperature for cooling;
(2) adding a proper amount of water into the constant-temperature water tank, turning on a power supply of the tester through a power supply button, enabling the tester to automatically enter a self-checking program, controlling by a main control circuit board, driving a screw rod to rotate by an up-and-down walking servo motor, driving a connecting seat and a measuring rod and measuring pin support to move to the uppermost end of the screw rod through the screw rod, setting a required test temperature through a touch industrial control computer, and starting constant-temperature control;
(3) after the temperature of the constant-temperature water tank reaches a set value, placing the cooled asphalt sample cup on a tripod in the constant-temperature water tank, and keeping the temperature of the asphalt sample in the constant-temperature water tank for 1.5-2.5 hours;
(4) the method comprises the following steps of connecting compressed air of about 0.4Mpa through an air compressor, enabling the compressed air to enter a measuring rod hole of an air bearing sleeve structure, enabling a measuring rod to be suspended and supported in the middle of the measuring rod hole, enabling the measuring rod and the measuring rod hole to have no contact friction, enabling the other path of compressed air to enter a lower end air cylinder cavity of the air bearing sleeve structure after passing through an electromagnetic valve, supporting the measuring rod and a load sensor to rise to the top, installing a counterweight corresponding to a required test load, and then installing a measuring pin at the lower end of the load sensor;
(5) carrying out initial position zero setting on the load sensor and the laser displacement sensor;
(6) when the test is started, the main control circuit board drives the up-and-down walking servo motor to drive the screw rod to rotate, the connecting seat and the measuring rod measuring pin support are driven to move downwards quickly by the screw rod, when the measuring pin on the measuring rod measuring pin support is close to the asphalt sample, the up-and-down walking servo motor automatically decelerates to low-speed operation, when the measuring pin is contacted with the surface of the asphalt sample, a load sensor on the measuring pin can feed back a force value change signal, when the force value signal reaches a threshold value of 0.05g, an instrument automatically judges that the measuring pin is contacted with the surface of the asphalt sample, the up-and-down walking servo motor automatically stops and keeps the position still, then the instrument enters a test state, an asphalt pin entry control program automatically starts an electromagnetic valve through the main control circuit board to rapidly release gas in a cylinder cavity, the measuring rod freely falls down, and the measuring pin is inserted into the asphalt sample through the dead weight, starting timing, synchronously recording corresponding data of displacement, load and time and obtaining a relation curve, stopping recording the data after set time is reached, wherein the set time is 5S, finishing the test, and automatically calculating a result and automatically storing the data;
(7) after the single test is finished, the electromagnetic valve is automatically opened by the asphalt needle penetration control program, compressed air enters the cylinder cavity, the measuring needle and the measuring rod are supported, the upper and lower walking servo motors are started to drive the lead screw, and the connecting seat and the measuring rod measuring needle support are driven to ascend to the top end of the tester.
(8) Performing parallel test on the same asphalt sample for at least 3 times, wherein the distance between each test point and the edge of the test sample cup is more than 10mm, replacing a clean test needle for each test or taking down the test needle, wiping the test needle clean with cotton or cloth dipped with trichloroethylene or kerosene solvent, and wiping the test needle dry with dry cotton or cloth;
(9) and the parallel test is repeated for 5-7 items.
The invention relates to a high-precision asphalt penetration tester, which has the beneficial effects that:
1. the tester adopts the air support bearing and the pneumatic support to reduce contact friction, adopts the force transducer to realize automatic needle alignment, adopts the laser displacement sensor to realize non-contact measurement, adopts the electronic refrigeration piece to realize accurate constant temperature, and ensures that the asphalt needle penetration tester with high asphalt performance detection precision.
2. The non-contact support of the measuring rod is realized through the air bearing sleeve structure, and the contact friction of the measuring rod during support can be eliminated, so that the test precision is improved;
3. the upper and lower walking modules are matched with the force measuring sensor, and automatic and high-precision needle alignment operation is realized in a software program automatic control mode, so that manual operation errors are eliminated;
4. the laser displacement sensor is adopted for measurement, the non-contact measurement has no friction, and the measurement precision is higher;
5. the electronic refrigeration sheet is adopted, so that the temperature control precision is high, the size is small, and the energy conservation and environmental protection are realized;
6. pneumatic loading or unloading is realized by adopting the cylinder cavity, and the electromagnetic valve is switched, so that the contact friction can be reduced, and the test precision is further improved;
7. the touch type industrial control computer is adopted for full-automatic control, a software program automatically records data and draws a relevant curve, and the data results of the penetration index, the equivalent softening point and the equivalent brittle point are automatically calculated, so that the operation is convenient.
Drawings
FIG. 1 is a left side view of a high precision asphalt penetration tester of the present invention;
fig. 2 is a front view of the embodiment of fig. 1.
Detailed Description
The invention is further illustrated by the following examples:
example (b):
a high-precision asphalt penetration tester comprises a rack 1, an up-down walking module 2, a measuring rod and measuring needle module 3, a sample placing module 4 and a control module 5;
the machine frame 1 comprises a first bedplate 11 and a second bedplate 12 which are horizontally arranged, and a rear supporting plate 13 which is vertically arranged at the rear end of the first bedplate, and the bottom of the machine frame is provided with a leveling foot margin 14;
the up-down walking module 2 comprises a first bearing seat 21 and a second bearing seat 22 which are fixed on the rear supporting plate, a screw rod 23 which is rotatably arranged between the first bearing seat and the second bearing seat through a bearing sleeve, and an up-down servo motor 24 which is fixed below the first bearing seat, wherein the up-down servo motor comprises an output shaft, the screw rod 23 penetrates through the first bearing seat, the lower end of the screw rod is connected with the output shaft, and the first bearing seat and the second bearing seat are respectively provided with a lower limiting button 25 and an upper limiting button 26;
the measuring rod and measuring needle module 3 comprises a connecting seat 31 sleeved on the screw rod through an internal thread structure, a measuring rod and measuring needle support 32 fixed in front of the connecting seat, a measuring rod 33 and a measuring needle 34, wherein the connecting seat is vertically movable and is limited on the screw rod in a left-right mode, and the connecting seat and the measuring rod and measuring needle support are driven to move up and down through the rotation of the screw rod;
the measuring rod 33 is of a columnar structure and comprises a counterweight part, a main body part and a clamping part from top to bottom, wherein the diameter of the main body part is larger than that of the counterweight part and that of the clamping part;
the measuring rod and measuring needle support 32 is provided with a middle platen 321, an air bearing sleeve structure 35 is fixedly arranged in the front lower portion of the middle platen, a measuring rod hole with the diameter slightly larger than that of the main body portion of the measuring rod is formed in the center of the air bearing sleeve structure, an air cylinder cavity 36 is arranged at the middle lower portion of the bearing sleeve structure, the measuring rod penetrates through the measuring rod hole and the air cylinder cavity, a measuring rod clamping portion is located at the center of the air cylinder cavity, the diameter of the measuring rod clamping portion is smaller than that of the main body portion of the measuring rod, the measuring rod can be jacked upwards through air inflation of the air cylinder cavity, an air guide groove 35a with the opening end close to the measuring rod is further arranged at the middle of the air bearing sleeve structure, compressed air enters the air bearing sleeve structure through the air guide groove, and the measuring rod is suspended and supported in the middle;
a measuring point adjusting screw rod 33d is arranged at the upper end of the measuring rod counterweight part, the upper end surface of the measuring point adjusting screw rod is a laser measuring point surface, the up-down position of the laser measuring point surface can be adjusted by rotating the measuring point adjusting screw rod, and a laser displacement sensor 37 is arranged on the measuring rod measuring pin support which is upward away from the measuring point adjusting screw rod by a certain distance;
the measuring rod clamping part penetrates through the cylinder cavity downwards, a load sensor 38 is arranged at the lower end of the clamping part, and the measuring needle 34 is connected to the lower end of the load sensor 38;
the sample placing module 4 comprises a constant-temperature water tank 41 arranged on the second platen, a triangular support 42 arranged in the constant-temperature water tank, and a sample cup 44 arranged on the triangular support and used for placing an asphalt sample 43, the constant-temperature water tank contains constant-temperature water 45, the horizontal plane of the constant-temperature water is higher than the upper end of the sample cup by a certain distance, and an electronic refrigerating sheet 46 is arranged on the inner wall of the constant-temperature water tank;
the air guide groove and the air cylinder cavity are respectively connected with an air compressor 6 through air guide pipes, and the air guide pipe connecting the air cylinder cavity and the air compressor is also provided with an electromagnetic valve 7;
the control module 5 comprises a main control circuit board 51 arranged at the front end of the first bedplate, a touch industrial control computer 52 fixedly arranged at one side of the frame, a power button 53, an upward adjusting switch 54 and a downward adjusting switch 55.
The high-precision asphalt penetration tester comprises the following operation processes:
(1) pouring the heated asphalt sample into a sample cup, and placing the sample cup at room temperature for cooling;
(2) adding a proper amount of water into the constant-temperature water tank, turning on a power supply of the tester through a power supply button, enabling the tester to automatically enter a self-checking program, controlling by a main control circuit board, driving a screw rod to rotate by an up-and-down walking servo motor, driving a connecting seat and a measuring rod and measuring pin support to move to the uppermost end of the screw rod through the screw rod, setting a required test temperature through a touch industrial control computer, and starting constant-temperature control;
(3) after the temperature of the constant-temperature water tank reaches a set value, placing the cooled asphalt sample cup on a tripod in the constant-temperature water tank, and keeping the temperature of the asphalt sample in the constant-temperature water tank for 1.5-2.5 hours;
(4) the method comprises the following steps of connecting compressed air of about 0.4Mpa through an air compressor, enabling the compressed air to enter a measuring rod hole of an air bearing sleeve structure, enabling a measuring rod to be suspended and supported in the middle of the measuring rod hole, enabling the measuring rod and the measuring rod hole to have no contact friction, enabling the other path of compressed air to enter a lower end air cylinder cavity of the air bearing sleeve structure after passing through an electromagnetic valve, supporting the measuring rod and a load sensor to rise to the top, installing a counterweight corresponding to a required test load, and then installing a measuring pin at the lower end of the load sensor;
(5) carrying out initial position zero setting on the load sensor and the laser displacement sensor;
(6) when the test is started, the main control circuit board drives the up-and-down walking servo motor to drive the screw rod to rotate, the connecting seat and the measuring rod measuring pin support are driven to move downwards quickly by the screw rod, when the measuring pin on the measuring rod measuring pin support is close to the asphalt sample, the up-and-down walking servo motor automatically decelerates to low-speed operation, when the measuring pin is contacted with the surface of the asphalt sample, a load sensor on the measuring pin can feed back a force value change signal, when the force value signal reaches a threshold value of 0.05g, an instrument automatically judges that the measuring pin is contacted with the surface of the asphalt sample, the up-and-down walking servo motor automatically stops and keeps the position still, then the instrument enters a test state, an asphalt pin entry control program automatically starts an electromagnetic valve through the main control circuit board to rapidly release gas in a cylinder cavity, the measuring rod freely falls down, and the measuring pin is inserted into the asphalt sample through the dead weight, starting timing, synchronously recording corresponding data of displacement, load and time and obtaining a relation curve, stopping recording the data after set time is reached, wherein the set time is 5S, finishing the test, and automatically calculating a result and automatically storing the data;
(7) after the single test is finished, the electromagnetic valve is automatically opened by the asphalt needle penetration control program, compressed air enters the cylinder cavity, the measuring needle and the measuring rod are supported, the upper and lower walking servo motors are started to drive the lead screw, and the connecting seat and the measuring rod measuring needle support are driven to ascend to the top end of the tester.
(8) Performing parallel test on the same asphalt sample for at least 3 times, wherein the distance between each test point and the edge of the test sample cup is more than 10mm, replacing a clean test needle for each test or taking down the test needle, wiping the test needle clean with cotton or cloth dipped with trichloroethylene or kerosene solvent, and wiping the test needle dry with dry cotton or cloth;
(9) and the parallel test is repeated for 5-7 items.
In this embodiment, the high-precision asphalt penetration tester has the following technical parameters:
1. laser displacement measurement range: 0-50 mm;
2. displacement measurement accuracy: 0.01 mm;
3. displacement measurement resolution: 0.001 mm;
4. loading load and balancing weight: 100g, 150g and 200 g;
5. loading load configuration precision: 0.02 g;
6. the measuring range of the load sensor is as follows: 0-250 g;
7. and (3) measuring precision: 0.01 g;
8. temperature control range: 0 to 50 ℃;
9. temperature control precision: 0.1 ℃;
10. lifting speed: 0.01-20mm/min, automatic setting;
11. and (3) testing time: the software is arbitrarily set for 0-100 s;
12. the time recording precision is 0.1 s.
The present invention has been described in detail, and it should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
Claims (4)
1. A high-precision asphalt penetration tester comprises a rack, a measuring rod and measuring pin module, an up-down walking module, a sample placing module and a control module, wherein the rack comprises a first platen and a second platen which are horizontally arranged, and a rear supporting plate which is vertically arranged at the rear end of the first platen; the up-down walking module comprises a first bearing seat and a second bearing seat which are fixed on the rear supporting plate, a lead screw which is rotatably arranged between the first bearing seat and the second bearing seat through a bearing sleeve, and an up-down moving servo motor which is fixed below the first bearing seat, the up-down moving servo motor comprises an output shaft, the lead screw penetrates through the first bearing seat, the lower end of the lead screw is connected with the output shaft, the measuring rod and measuring needle module comprises a connecting seat which is sleeved on the lead screw through an internal thread structure, a measuring rod and measuring needle support which is fixed in front of the connecting seat, a measuring rod and a measuring needle, the connecting seat is movably arranged on the lead screw in a left-right limiting mode, the connecting seat and the measuring rod and measuring needle support are driven to move up and down through the rotation of the lead screw, the measuring rod and measuring needle support is provided with, And set up the A-frame in the constant temperature water tank, and set up the specimen cup that is used for placing the pitch sample on the A-frame, control module is including setting up in the main control circuit board of first platen front end, and fixed the touch industrial control computer that sets up in frame one side, and power button, and upwards regulating switch, and regulating switch down, the main control circuit board with reciprocate the servo motor electricity and be connected, the main control circuit board is connected with touch industrial control computer, the touch industrial control computer installs pitch needle penetration control program at least, pitch needle penetration control program includes self-checking program at least, its characterized in that:
the measuring rod is of a columnar structure and comprises a counterweight part, a main body part and a clamping part from top to bottom, and the diameter of the main body part is larger than that of the counterweight part and that of the clamping part;
an air bearing sleeve structure is fixedly arranged in front of and below a middle platen of the measuring bar measuring pin support, a measuring bar hole with the diameter slightly larger than the diameter of a measuring bar main body is formed in the center of the air bearing sleeve structure, a cylinder cavity is arranged at the middle lower position of the bearing sleeve structure, a through hole larger than the diameter of the measuring bar is formed in the middle platen corresponding to the measuring bar position, the measuring bar penetrates through the middle platen, the measuring bar hole and the cylinder cavity, a measuring bar clamping part is arranged at the center of the cylinder cavity, the diameter of the measuring bar clamping part is smaller than the diameter of the measuring bar main body, the measuring bar can be jacked upwards through inflation of the cylinder cavity, an air guide groove with an opening end close to the measuring bar is further arranged at the middle position of the air bearing sleeve structure, compressed air enters the air bearing sleeve structure through the air guide groove, and the measuring bar is suspended and supported in the middle of the measuring bar hole;
the upper end of the measuring rod counterweight part is provided with a measuring point adjusting screw rod, the upper end surface of the measuring point adjusting screw rod is a laser measuring point surface, the upper and lower positions of the laser measuring point surface can be adjusted by rotating the measuring point adjusting screw rod, and the measuring rod measuring needle support is upward away from the measuring point adjusting screw rod by a certain distance and is also provided with a laser displacement sensor;
the air guide groove and the air cylinder cavity are respectively connected with an air compressor through an air guide pipe, and the air guide pipe of the air cylinder cavity connected with the air compressor is also provided with an electromagnetic valve;
the measuring rod clamping part penetrates through the cylinder cavity downwards, a load sensor is arranged at the lower end of the clamping part, and the measuring needle is connected to the lower end of the load sensor;
an electronic refrigerating sheet for controlling the temperature through computer software is arranged on the inner wall of the constant-temperature water tank of the sample placing module, so that the temperature in the constant-temperature water tank is kept constant;
the main control circuit board is also respectively electrically connected with the electromagnetic valve, the air compressor, the laser displacement sensor, the load sensor and the electronic refrigeration piece, and the electromagnetic valve, the air compressor, the laser displacement sensor, the load sensor and the electronic refrigeration piece are controlled through the main control circuit board.
2. A high-precision asphalt penetration tester according to claim 1, wherein the bottom of the frame is provided with a leveling foot.
3. The high-precision asphalt penetration tester according to claim 1, wherein the first bearing seat and the second bearing seat are further provided with a lower limit button and an upper limit button respectively.
4. A high precision asphalt penetration tester according to any one of claims 1 to 3, wherein the penetration tester is operated as follows:
(1) pouring the heated asphalt sample into a sample cup, and placing the sample cup at room temperature for cooling;
(2) adding a proper amount of water into the constant-temperature water tank, turning on a power supply of the tester through a power supply button, enabling the tester to automatically enter a self-checking program, controlling by a main control circuit board, driving a screw rod to rotate by an up-and-down walking servo motor, driving a connecting seat and a measuring rod and measuring pin support to move to the uppermost end of the screw rod through the screw rod, setting a required test temperature through a touch industrial control computer, and starting constant-temperature control;
(3) after the temperature of the constant-temperature water tank reaches a set value, placing the cooled asphalt sample cup on a tripod in the constant-temperature water tank, and keeping the temperature of the asphalt sample in the constant-temperature water tank for 1.5-2.5 hours;
(4) the method comprises the following steps of connecting compressed air of about 0.4Mpa through an air compressor, enabling the compressed air to enter a measuring rod hole of an air bearing sleeve structure, enabling a measuring rod to be suspended and supported in the middle of the measuring rod hole, enabling the measuring rod and the measuring rod hole to have no contact friction, enabling the other path of compressed air to enter a lower end air cylinder cavity of the air bearing sleeve structure after passing through an electromagnetic valve, supporting the measuring rod and a load sensor to rise to the top, installing a counterweight corresponding to a required test load, and then installing a measuring pin at the lower end of the load sensor;
(5) carrying out initial position zero setting on the load sensor and the laser displacement sensor;
(6) when the test is started, the main control circuit board drives the up-and-down walking servo motor to drive the screw rod to rotate, the connecting seat and the measuring rod measuring pin support are driven to move downwards quickly by the screw rod, when the measuring pin on the measuring rod measuring pin support is close to the asphalt sample, the up-and-down walking servo motor automatically decelerates to low-speed operation, when the measuring pin is contacted with the surface of the asphalt sample, a load sensor on the measuring pin can feed back a force value change signal, when the force value signal reaches a threshold value of 0.05g, an instrument automatically judges that the measuring pin is contacted with the surface of the asphalt sample, the up-and-down walking servo motor automatically stops and keeps the position still, then the instrument enters a test state, an asphalt pin entry control program automatically starts an electromagnetic valve through the main control circuit board to rapidly release gas in a cylinder cavity, the measuring rod freely falls down, and the measuring pin is inserted into the asphalt sample through the dead weight, starting timing, synchronously recording corresponding data of displacement, load and time and obtaining a relation curve, stopping recording the data after set time is reached, wherein the set time is 5S, finishing the test, and automatically calculating a result and automatically storing the data;
(7) after the single test is finished, the electromagnetic valve is automatically opened by the asphalt needle penetration control program, compressed air enters the cylinder cavity, the measuring needle and the measuring rod are supported, the upper and lower walking servo motors are started to drive the lead screw, and the connecting seat and the measuring rod measuring needle support are driven to ascend to the top end of the tester.
(8) Performing parallel test on the same asphalt sample for at least 3 times, wherein the distance between each test point and the edge of the test sample cup is more than 10mm, replacing a clean test needle for each test or taking down the test needle, wiping the test needle clean with cotton or cloth dipped with trichloroethylene or kerosene solvent, and wiping the test needle dry with dry cotton or cloth;
(9) and the parallel test is repeated for 5-7 items.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010019036.XA CN111198148A (en) | 2020-01-08 | 2020-01-08 | High-precision asphalt penetration tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010019036.XA CN111198148A (en) | 2020-01-08 | 2020-01-08 | High-precision asphalt penetration tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111198148A true CN111198148A (en) | 2020-05-26 |
Family
ID=70746526
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010019036.XA Pending CN111198148A (en) | 2020-01-08 | 2020-01-08 | High-precision asphalt penetration tester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111198148A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112067505A (en) * | 2020-09-23 | 2020-12-11 | 山东路达试验仪器有限公司 | Automatic control method of asphalt penetration tester based on image recognition |
| CN113433034A (en) * | 2021-06-28 | 2021-09-24 | 南京林业大学 | Pouring type asphalt mixture temperature induction fluidity tester |
| CN113607099A (en) * | 2021-06-30 | 2021-11-05 | 深圳市蓝蓝科技有限公司 | Contact type measuring head, three-coordinate measuring machine and tool setting gauge |
| CN114965168A (en) * | 2022-05-23 | 2022-08-30 | 东北林业大学 | Test instrument and method for evaluating physical hardening of asphalt |
-
2020
- 2020-01-08 CN CN202010019036.XA patent/CN111198148A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112067505A (en) * | 2020-09-23 | 2020-12-11 | 山东路达试验仪器有限公司 | Automatic control method of asphalt penetration tester based on image recognition |
| CN113433034A (en) * | 2021-06-28 | 2021-09-24 | 南京林业大学 | Pouring type asphalt mixture temperature induction fluidity tester |
| CN113433034B (en) * | 2021-06-28 | 2022-07-01 | 南京林业大学 | Pouring type asphalt mixture temperature induction fluidity tester |
| CN113607099A (en) * | 2021-06-30 | 2021-11-05 | 深圳市蓝蓝科技有限公司 | Contact type measuring head, three-coordinate measuring machine and tool setting gauge |
| CN114965168A (en) * | 2022-05-23 | 2022-08-30 | 东北林业大学 | Test instrument and method for evaluating physical hardening of asphalt |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111198148A (en) | High-precision asphalt penetration tester | |
| CN109211684B (en) | Mechanical high-temperature creep testing machine capable of realizing automatic accurate loading | |
| CN108169047A (en) | A kind of novel friction abrasion tester for testing film material | |
| CN106644692A (en) | Test device for determining creep of concrete | |
| CN204694557U (en) | A kind of equipment measuring epoxy resin girder tensile deformation restorability | |
| CN211627279U (en) | High-precision asphalt penetration tester | |
| CN116735404B (en) | Device for detecting mechanical durability of surface of hydrophobically modified cement-based material | |
| CN211826241U (en) | Positioning bracket of four-probe tester | |
| CN108254246A (en) | It is a kind of to measure the pendulum impact test equipment accurately with regulatory function | |
| CN108414381A (en) | A kind of micro linear reciprocating friction abrasion tester of combination frictional interface in-situ observation | |
| CN209432657U (en) | A kind of automatic bitumen needle forcemeter | |
| CN218524455U (en) | Environment-friendly building material detection device | |
| CN217738184U (en) | Instant elongation measurer for creep endurance test | |
| CN214097051U (en) | High-efficient formula pitch penetration testing arrangement based on image recognition technology | |
| CN206378390U (en) | A kind of pitch test automatic liquid-feeding formula contact angle measurement | |
| CN215677943U (en) | Rockwell hardness tester based on indentation depth | |
| CN207408223U (en) | A kind of fibrous mechanical property tests system | |
| CN218535341U (en) | Capsule manufacturing machine | |
| CN112067504A (en) | Asphalt penetration tester based on image recognition automatic needle alignment | |
| CN114485490A (en) | Plastic part flatness detection jig | |
| CN209470986U (en) | A kind of bitumen ductility instrument based on video auxiliary | |
| CN110567846A (en) | Asphalt bending beam rheometer | |
| CN219320021U (en) | Tester for asphalt penetration | |
| CN206804247U (en) | A kind of 120MN bridge pad test machines of Dynamic High-accuracy measurement | |
| CN112067505B (en) | Automatic control method of asphalt penetration tester based on image recognition |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |