CN215931590U

CN215931590U - Pitch penetration tester

Info

Publication number: CN215931590U
Application number: CN202122299406.2U
Authority: CN
Inventors: 郭思怡; 冯振刚; 刘淼; 孙延晨; 焦晓来; 王浩男; 王舒霏; 梁雷晨; 李瑞妍; 潘宇浩
Original assignee: Changan University
Current assignee: Changan University
Priority date: 2021-09-22
Filing date: 2021-09-22
Publication date: 2022-03-01
Anticipated expiration: 2031-09-22

Abstract

The utility model provides an asphalt penetration tester, wherein a sliding table is vertically arranged at one end of the upper surface of a workbench, a constant-temperature water bath kettle is arranged on the workbench, and a sample is horizontally placed below the water level of the constant-temperature water bath kettle; one side of the sliding table, which faces the constant-temperature water bath kettle, is provided with a sliding groove, the sliding groove is arranged along the height direction of the sliding table, the sliding groove and the sliding table are coaxially arranged, the sliding groove is rotatably arranged on the workbench along the direction parallel to the sliding table, the supporting rod is positioned in the sliding groove, one end of the sliding block is sleeved in the sliding groove and the supporting rod, one end of the sliding block is fixedly connected with a connecting piece, the lower end of the connecting piece is fixedly provided with a connecting rod, the lower end of the connecting rod is fixedly connected with a standard needle which is vertically downward, and the standard needle is positioned right above an asphalt sample; set up time control board and synchronization button on the workstation, they and bracing piece series connection, the material of bracing piece and slider is the metal, and the slider is provided with the scale with one side of slip table contact, and the slip table is provided with the scale with one side of slider contact.

Description

Pitch penetration tester

Technical Field

The utility model relates to the technical field of measuring instruments, in particular to an asphalt penetration tester.

Background

Asphalt is an essential raw material in the road building process, and an asphalt pavement also has many irreplaceable advantages, such as high driving comfort, small vibration, short construction period, difficult dust emission, easy cleaning, simple and convenient maintenance and regeneration, and the like.

The penetration of asphalt is an important property index of asphalt, can show the hardness and softness degree of the asphalt, resist the shearing damage and reflect the relative consistency index of the asphalt under certain conditions. According to the provisions of road engineering asphalt and asphalt mixture test procedures (JTG E20-2011), the total mass of the standard needle, the connecting rod and the additional weight is 100g +/-0.05 g, the test temperature is 25 ℃, the standard needle penetration time is 5s, and the vertical penetration depth of the standard needle into the asphalt sample is a needle penetration value and takes 0.1mm as a unit.

The existing asphalt penetrometer mainly has the following defects: (1) the standard needle is required to be 5s from the time of contacting asphalt to the time of inserting the asphalt by the specification, but the experiment generally adopts a method of holding a stopwatch, so that a large operation error exists; (2) the displacement of the measuring rod to the standard needle before and after the standard needle is inserted into the asphalt is used as a penetration value, the measuring method is not accurate enough, and the experimental result is possibly inaccurate due to slight touch.

SUMMERY OF THE UTILITY MODEL

Aiming at the problems in the prior art, the utility model provides an asphalt penetration tester which can solve the problems of excessive manual operation error and influence and inaccurate test result in the prior art.

The utility model is realized by the following technical scheme:

an asphalt penetration tester comprises a workbench, a constant-temperature water bath, a time control panel, a synchronous button, a sliding table, a sliding block, a connecting piece, a standard needle and a supporting rod;

a sliding table is vertically arranged at one end of the upper surface of the workbench, the sliding table is of a columnar structure, a constant-temperature water bath kettle is arranged on the workbench, a gap is reserved between the constant-temperature water bath kettle and the sliding table, and an asphalt sample is horizontally placed below the water level of the constant-temperature water bath kettle;

one side of the sliding table, which faces the constant-temperature water bath kettle, is provided with a sliding groove, the sliding groove is arranged along the height direction of the sliding table, the sliding groove and the sliding table are coaxially arranged, the sliding groove is rotatably arranged on the workbench along the direction parallel to the sliding table, the supporting rod is positioned in the sliding groove, one end of the sliding block is sleeved in the sliding groove and the supporting rod, the other end of the sliding block is fixedly connected with a connecting piece, a connecting rod which faces downwards vertically is fixedly arranged below the connecting piece, a standard needle which faces downwards vertically is arranged below the connecting rod, and the standard needle is positioned right above an asphalt sample;

the workstation on be provided with time control panel and synchronization button, time control panel, synchronization button and bracing piece are established ties, the material of bracing piece and slider is the metal, one side of slider and slip table contact is provided with the scale, one side of slip table and slider contact is provided with the scale.

Preferably, the bottom of constant temperature water bath be provided with the pivot, install the round stand in the pivot, evenly seted up a plurality of sample cell in the round stand, the pitch sample is a plurality of, a plurality of pitch sample is placed respectively in the sample cell that corresponds.

Furthermore, the inner surface of the sample groove is provided with an elastic gasket, and a plurality of asphalt samples are respectively placed in the corresponding elastic gaskets.

Preferably, the constant-temperature water bath kettle is connected with a low-temperature constant-temperature water bath, and the adjusting constant-temperature water bath is used for adjusting the temperature and circulation of water in the constant-temperature water bath kettle.

Preferably, still include the pressure sensor who sets up with workstation and constant temperature water bath contact, pressure sensor's output be connected with pressure display screen, pressure display screen sets up on the workstation.

Preferably, the water level device further comprises a water level fixedly arranged on one side of the workbench.

Preferably, the below of workstation is provided with the support column that the number is no less than 4, rotates in every support column and is provided with a nut, and the nut is higher than the upper surface of support column, rotates in the nut and is provided with the screw rod, and the upper end of screw rod sets up with the lower terminal surface of workstation is fixed.

Preferably, the sliding groove is a dovetail groove, one end of the sliding block is in a trapezoidal block matched with the sliding groove, and a through hole with the same outer diameter as the supporting rod is formed in the trapezoidal block.

Further, the bracing piece include smooth portion and screw thread portion of a body structure from bottom to top, install thick accurate burnt spiral and thin accurate burnt spiral on the screw thread portion, thick accurate burnt spiral and thin accurate burnt spiral are fixed the laminating respectively and are close to the both sides of top end position at the slip table, the slider cover is established in the smooth portion.

Preferably, the support rod and the slide block are made of soft iron or silicon steel.

Compared with the prior art, the utility model has the following beneficial technical effects:

the utility model relates to an asphalt penetration measuring instrument, wherein a sliding table and a constant temperature water bath kettle with a columnar structure are arranged on the upper surface of a workbench, a gap is reserved between the constant temperature water bath kettle and the sliding table, so that the temperature required by a test can be adjusted by using water in the constant temperature water bath kettle, a sliding groove along the height direction of the sliding table can be arranged on one side of the sliding table facing the constant temperature water bath kettle, a supporting rod is arranged on the workbench in a rotating manner along the direction parallel to the sliding table to be positioned in the sliding groove, so that one end of a sliding block can be sleeved in the sliding groove and the supporting rod, a standard needle can be fixed at the lower end of a connecting rod and can be positioned right above an asphalt sample, and a time control plate and a synchronous button are arranged on the workbench, the materials of the supporting rod and the sliding block are selected to be metal, when the time control board, the synchronous button and the support bar are connected in series, the support bar and the slide block can generate magnetic force through current in a circuit to attract each other, at the moment, the support bar can be rotated to adjust the distance between the standard needle and the asphalt sample, the standard needle is contacted with the asphalt sample step by step, because scales are arranged on one side of the slide block, which is contacted with the sliding table, the test time is set on the time control board in advance, after the synchronous button is pressed, the slide block and the support bar can not receive current, the slide block can freely fall down at the moment, the position is kept fixed under the action of the magnetic force generated by the current after the preset time is reached, and finally, the difference value between the final position and the initial position of the slide block is kept to 0.1mm, namely the needle penetration value, the utility model can measure the needle penetration in the slide block and the sliding table by utilizing the principle of a vernier caliper, can accurately measure the asphalt needle penetration, and achieve the aim of improving the accuracy of measuring the needle penetration, timing and standard needle go on simultaneously, can reach five seconds, stop the removal of standard needle, be different from the way that traditional experiment separates standard needle and timing, avoided the measuring method of general experiment measuring stick contact effectively, easy operation has improved the experiment precision.

Further, unlike the conventional experiment, the utility model does not need to take out the tested asphalt sample after a group of experiments, but puts the untested asphalt sample under the standard needle by rotating the circular frame, thereby improving the test efficiency.

Furthermore, the experiment generally judges whether the standard needle contacts the surface of the asphalt sample through a reflector and naked eyes, the process is time-consuming and has many human factors to cause inaccurate experiment results, and the utility model judges whether the standard needle is basically on the surface of the asphalt through the readings transmitted by the pressure sensor, thereby eliminating errors caused by light refraction and naked eye observation.

Furthermore, whether the asphalt penetration tester reaches a horizontal state or not is judged through the level gauge, so that the method is simple and convenient, and rough judgment is not required to be carried out by naked eyes.

Drawings

FIG. 1 is a left side view of the penetration tester for asphalt according to the present invention.

FIG. 2 is a front view of the penetration tester for asphalt according to the present invention.

Figure 3 is a front view of the support pole of figure 2.

Fig. 4 is a horizontal sectional view of the slider in fig. 2.

Fig. 5 is a top view of the rotating gantry of fig. 2.

FIG. 6 is a front view of the low-temperature thermostatic water bath of the present invention.

Fig. 7 is a horizontal sectional view of the slide table of fig. 2.

In the figure: 1-workbench, 2-round rack, 2-1 sample tank, 3-constant temperature water bath, 4-time control board, 5-synchronous button, 6-sliding table, 7-sliding chute, 8-sliding block, 9-connecting piece, 10-pressure sensor, 11-level, 12-rotating shaft, 13-standard needle, 14-screw rod, 15-nut, 16-fine quadcocus spiral, 17-coarse quadcocus spiral, 18-low temperature constant temperature water bath, 18-1-temperature display screen, 18-2-temperature button, 18-3-support, 18-4-circulation switch, 18-5-heating switch, 18-6-refrigeration switch, 18-7-power switch, 19-supporting rod, 19-1-threaded part, 19-2-smooth part, 20-support column, 21-pressure display screen, 22-weight and 23-connecting rod.

Detailed Description

The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.

The utility model relates to an asphalt penetration measuring instrument, which mainly comprises a workbench 1, a constant-temperature water bath 3, a time control plate 4, a synchronous button 5, a sliding table 6, a sliding chute 7, a sliding block 8, a connecting piece 9, a pressure sensor 10, a level 11, a standard needle 13, a screw 14, a nut 15, a fine focusing screw 16, a coarse focusing screw 17, a low-temperature constant-temperature water bath 18 and a support rod 19;

as shown in fig. 1 and 2, the one end of workstation 1 upper surface is provided with slip table 6 perpendicularly, and slip table 6 is columnar structure, is provided with constant temperature water bath 3 on the workstation 1, and constant temperature water bath 3 and slip table 6 set up along the length direction of workstation 1 upper surface, and constant temperature water bath 3 and slip table 6 leave the clearance, and the pitch sample has been placed to the water level below level of constant temperature water bath 3.

The spout 7 has been seted up towards one side of constant temperature water bath 3 to slip table 6, the direction of height setting of slip table 6 is followed to spout 7, spout 7 and the coaxial setting of slip table 6, all cross sectional shape and the size of spout 7 are all the same, bracing piece 19 rotates along the direction that is on a parallel with slip table 6 and sets up on workstation 1, bracing piece 19 is arranged in spout 7, a pot head of slider 8 is established in spout 7 and bracing piece 19, the other end of slider 8 is fixed with the connecting piece 9 of column structure, the lower extreme of connecting piece 9 is fixed with perpendicular connecting rod 23 down, connecting rod 23 below is fixed and is provided with perpendicular standard needle 13 down, standard needle 13 is located the directly over pitch sample. Specifically, the upper end of the standard needle 13 is in a threaded structure, and the upper end of the standard needle 13 is fixed on the connecting rod 23 through threaded rotation.

The front face of the workbench 1 is provided with a time control panel 4 and a synchronous button 5, the time control panel 4, the synchronous button 5 and the support rod 19 are connected in series, the support rod 19 and the slider 8 are made of metal, the metal is further soft iron or silicon steel, one side of the slider 8 contacting the sliding table 6 is provided with scales, and one side of the sliding table 6 contacting the slider 8 is provided with scales. Before the synchronous button 5 is not started, the supporting rod 19 and the sliding block 8 are always in a power-on state, so that the sliding block 8 and the supporting rod 19 are fixed through mutual attraction of magnetic force, the sliding block 8 and the supporting rod 19 cannot receive current when the synchronous button 5 is pressed down, the sliding block 8 freely falls, and the falling time of the sliding block 8 is controlled through the time on the time control plate 4.

For how to install the asphalt sample, the bottom of the constant-temperature water bath 3 is fixedly provided with a rotating shaft 12, the rotating shaft 12 is provided with a circular frame 2, the circular frame 2 is of a cylindrical structure, and the rotating shaft 2 can rotate in a horizontal plane manually. As shown in fig. 5, four sample wells 2-1 having a cylindrical structure are uniformly formed in the circular frame 2 around the rotating shaft 12, 4 asphalt samples are provided, and the 4 asphalt samples are respectively placed in the corresponding sample wells 2-1. The inner surface of the sample groove 2-1 is provided with an elastic gasket, a plurality of asphalt samples are respectively placed in the corresponding elastic gaskets, a sample containing vessel filled with asphalt is ensured to be adapted to the sample groove 2-1, and the sample containing vessel is higher than the sample groove 2-1.

For how to keep the temperature of the asphalt sample, the constant temperature water bath 3 is connected with a low temperature constant temperature water bath 18 shown in figure 6, the low temperature constant temperature water bath 18 is respectively provided with a temperature display screen 18-1, a temperature button 18-2, a support 18-3, a circulation switch 18-4, a heating switch 18-5, a refrigeration switch 18-6 and a power switch 18-7, and the temperature and the circulation of water in the constant temperature water bath 3 can be adjusted by adjusting the constant temperature water bath 18.

The utility model also discloses a pressure sensor 10 which is arranged in contact with the workbench 1 and the constant-temperature water bath kettle 3, the pressure sensor 10 is fixed on the upper surface of the workbench 1 and is positioned on the lower surface of the constant-temperature water bath kettle 3, the output end of the pressure sensor 10 is connected with a pressure display screen 21, the pressure display screen 21 is arranged on the front surface of the workbench 1, and the indication number of the pressure display screen 21 is used for judging whether the standard needle 13 is on the asphalt surface, because the indication number of the pressure display screen 21 is slightly increased when the standard needle 13 just contacts the asphalt sample.

Further, a circular level 11 is fixedly installed on one side of the table 1, and the circular level 11 is specifically fixedly installed on the left side of the table 1 in order to determine whether the asphalt penetration meter is in a horizontal state.

When the bubble in the surveyor's level 11 shows pitch needle penetration apparatus and does not reach the horizontality, can set up specific adjusting device, be provided with the support column 20 that the number is no less than 4 specifically in the below of workstation 1, it is provided with a nut 15 to rotate in every support column 20, nut 15 is higher than the upper surface of support column 20, it is provided with screw rod 14 to rotate in the nut 15, the upper end of screw rod 14 sets up with the lower terminal surface of workstation 1 is fixed, adjust the position of bubble in the surveyor's level 11 through rotating nut 15, guarantee that pitch needle penetration apparatus is in horizontal position.

Specifically, as shown in fig. 7, the sliding groove 7 is a dovetail groove, and specifically, as shown in fig. 4, one end of the slider 8 is configured as a trapezoidal block matched with the sliding groove 7, and a through hole having the same outer diameter as that of the support rod 19 is formed in the trapezoidal block.

In order to specifically adjust the distance between the standard needle 13 and the asphalt sample, the support rod 19 can be designed into a smooth part 19-2 and a threaded part 19-1 which are integrally structured as shown in fig. 3 from bottom to top, the length of the threaded part 19-1 is shorter than that of the smooth part 19-2, the diameter of the threaded part 19-1 is smaller than that of the smooth part 19-2, one end of the slide block 8 is sleeved on the smooth part 19-2, the threaded part 19-1 is provided with a coarse focusing screw 17 and a fine focusing screw 16, the coarse focusing screw 17 and the fine focusing screw 16 are respectively fixedly attached to two sides of the sliding table 6 close to the top end, and the slide block 8 is sleeved in the smooth part 19-2. The sliding block 8 can be controlled to move up and down through the rotation of the coarse focusing screw 17 and the fine focusing screw 16 which are matched with each other.

Specifically, the sample containing vessel is made of metal, and has an inner diameter of 55mm and a depth of 35 mm. The diameter of the circular frame 2 is 150 mm. The height of the connecting piece 9 can be adjusted by adjusting the thick focusing screw 17 and the thin focusing screw 16, so that the standard needle 13 is ensured to be just contacted with the surface of the asphalt sample.

A weight 22 is mounted on the gauge pin 13 so that the total weight of the slider 8, the connector 9, the gauge pin 13 and the weight 22 can be 100g ± 0.05 g. By utilizing the principle of a vernier caliper, the length represented by the minimum scale on the sliding table 6 is 1mm, and the total length represented by 50 scales on the sliding block 8 is 0.98mm, so that the measurement accuracy can reach 0.02 mm. The time control board 4 may select the falling time to be 5s or 60 s. When the synchronous button 5 is pressed, the standard needle 13, the sliding block 8 and the connecting piece 9 fall together, and fall by inertia after the time selected by the time control plate 4 is reached.

The utility model relates to an asphalt penetrometer, which is used for measuring the asphalt penetration, and comprises the following specific steps:

1) adjusting the nut 15 on the support pillar 20 to center the bubble of the level 11, and stopping adjusting the nut 15;

2) switching on a power supply, manually moving the sliding block 8 upwards until the top end of the sliding block 8 moves to the joint of the smooth part 19-2 and the threaded part 19-1, and mounting the standard needle 13 on the connecting rod 23;

3) adding water into the constant temperature water bath kettle 3 to enable the water level to be higher than the sample container, and passing through the low temperature constant temperature water bath 18 until the water in the constant temperature water bath kettle reaches the designated temperature.

4) When the water in the constant temperature water bath 3 reaches a designated temperature, 4 test samples are placed in the sample tank 2-1.

5) And adjusting the coarse focusing screw 17 and the fine focusing screw 16 to slightly increase the display number of the pressure display screen 21, so that the standard needle 13 can be considered to reach the height capable of carrying out the penetration test, namely to be in contact with the test asphalt sample.

6) The readings of the slide table 6 and the slide block 8 are read out by using the principle of a vernier caliper and recorded as initial positions.

7) When the synchronization button 5 is pressed, the readings of the slide table 6 and the slider 8 are read and recorded as the final position.

8) And the difference value between the readings of the final position and the initial position is accurate to 0.1mm, namely the penetration value.

9) The standard needle 13 is removed, wiped with kerosene or trichloroethylene and the circular frame 2 is rotated for the next set of tests until the test is completed.

Claims

1. An asphalt penetration tester is characterized by comprising a workbench (1), a constant-temperature water bath (3), a time control plate (4), a synchronous button (5), a sliding table (6), a sliding block (8), a connecting piece (9), a standard needle (13) and a support rod (19);

one end of the upper surface of the workbench (1) is vertically provided with a sliding table (6), the sliding table (6) is of a columnar structure, the workbench (1) is provided with a constant-temperature water bath (3), a gap is reserved between the constant-temperature water bath (3) and the sliding table (6), and an asphalt sample is horizontally placed below the water level of the constant-temperature water bath (3);

one side of the sliding table (6) facing the constant-temperature water bath kettle (3) is provided with a sliding groove (7), the sliding groove (7) is arranged along the height direction of the sliding table (6), the sliding groove (7) and the sliding table (6) are coaxially arranged, the cross sections of the sliding groove (7) are identical in shape and size, a supporting rod (19) is rotatably arranged on the workbench (1) along the direction parallel to the sliding table (6), the supporting rod (19) is positioned in the sliding groove (7), one end of a sliding block (8) is sleeved in the sliding groove (7) and the supporting rod (19), the other end of the sliding block (8) is fixedly connected with a connecting piece (9), a connecting rod (23) which faces downwards vertically is fixedly arranged below the connecting piece (9), a standard needle (13) which faces downwards vertically is arranged below the connecting rod (23), and the standard needle (13) is positioned right above an asphalt sample;

workstation (1) on be provided with time control panel (4) and synchronization button (5), time control panel (4), synchronization button (5) and bracing piece (19) are established ties, the material of bracing piece (19) and slider (8) is the metal, one side that slider (8) and slip table (6) contact is provided with the scale, one side that slip table (6) and slider (8) contact is provided with the scale.

2. The asphalt penetration tester according to claim 1, wherein a rotating shaft (12) is arranged at the bottom of the constant-temperature water bath (3), a circular frame (2) is mounted on the rotating shaft (12), a plurality of sample tanks (2-1) are uniformly arranged in the circular frame (2), the number of asphalt samples is a plurality, and the plurality of asphalt samples are respectively placed in the corresponding sample tanks (2-1).

3. An asphalt penetration tester according to claim 2, wherein the inner surface of the sample tank (2-1) is provided with an elastic gasket, and a plurality of asphalt samples are respectively placed in the corresponding elastic gaskets.

4. An asphalt penetration tester according to claim 1, wherein the constant temperature water bath (3) is connected with a low temperature constant temperature water bath (18), and the low temperature constant temperature water bath (18) is used for adjusting the temperature and circulation of water in the constant temperature water bath (3).

5. The asphalt penetration tester according to claim 1, further comprising a pressure sensor (10) in contact with the workbench (1) and the constant temperature water bath (3), wherein the output end of the pressure sensor (10) is connected with a pressure display screen (21), and the pressure display screen (21) is arranged on the workbench (1).

6. An asphalt penetration tester according to claim 1, further comprising a level (11) fixedly provided at one side of the table (1).

7. An asphalt penetration tester according to claim 1, wherein the number of the support columns (20) is not less than 4, a nut (15) is rotatably arranged in each support column (20), the nut (15) is higher than the upper surface of each support column (20), a screw (14) is rotatably arranged in the nut (15), and the upper end of the screw (14) is fixedly arranged with the lower end surface of the workbench (1).

8. The asphalt penetration tester according to claim 1, wherein the sliding groove (7) is a dovetail groove, one end of the sliding block (8) is structured into a trapezoidal block matched with the sliding groove (7), and a through hole with the same outer diameter as the supporting rod (19) is arranged in the trapezoidal block.

9. The asphalt penetration tester according to claim 8, wherein the supporting rod (19) comprises a smooth part (19-2) and a threaded part (19-1) which are of an integral structure from bottom to top, the threaded part (19-1) is provided with a coarse focusing screw (17) and a fine focusing screw (16), the coarse focusing screw (17) and the fine focusing screw (16) are respectively and fixedly attached to two sides of the sliding table (6) close to the top end, and the sliding block (8) is sleeved in the smooth part (19-2);

the trapezoid block is provided with a through hole with the same outer diameter as the smooth part (19-2).

10. An asphalt penetration tester according to claim 1, wherein the support rod (19) and the slide block (8) are made of soft iron or silicon steel.