An asphalt mixture mix design device

Abstract

The present invention discloses a device for designing the mix proportion of asphalt mixture, which includes a frame, a jack, a lower clamp, an upper clamp, a displacement sensor, a pressure sensor and a push rod. By rotatably connecting the lower clamp to the actuator of the jack around a vertical axis, and arranging a push rod on the frame that can contact the bottom surface of the upper clamp without contacting the lower clamp. So that the jack can apply thrust and tension to the lower clamp. Before the test, the staff can rotate the lower clamp and the upper clamp to move them to a position not obstructed by the push rod, and it is easy to adjust the position of the specimen to make it located between the lower clamp and the upper clamp. After the test, the staff can rotate the lower clamp and the upper clamp so that when the upper clamp descends, it abuts against the push rod and stops moving, and the lower clamp continues to descend to separate from the upper clamp, which is convenient for the staff to replace the specimen.

Description

Technical Field

[0001] The present invention relates to the field of testing the strength characteristics of solid materials with a stable pressure, and particularly relates to a device for designing the mix proportion of asphalt mixtures. Background Art

[0002] The Marshall test is an experiment to determine the optimal mix proportion of asphalt mixtures. The test process is to compact the specimens standardly under specified temperature, humidity and other conditions, measure indexes such as the stability and flow value of the asphalt mixture, and after a series of calculations, draw the relationship curves between the mix proportion and stability, flow value, density, void ratio, and saturation respectively, and finally determine the optimal mix proportion of the asphalt mixture. Therefore, the Marshall tester is an essential device in the design of the mix proportion of asphalt mixtures.

[0003] There are still many problems to be solved in the use of the existing Marshall testers. For example:

[0004] Before the test, it is necessary to clamp the specimen in the center of the fixture. This process mainly relies on the visual inspection of the staff, and the position of the specimen is inaccurate.

[0005] During the test, the temperature of the fixture drops rapidly and it is difficult to maintain at the specified test temperature, and it needs to be heated repeatedly in the water bath.

[0006] After the test, it is difficult to open the fixture, and usually it needs to be pried open by the staff. Summary of the Invention

[0007] The purpose of the present invention is to provide a device for designing the mix proportion of asphalt mixtures to solve the technical problems that the existing strength test equipment for asphalt mixture specimens relies too much on manual operation and the test efficiency is low.

[0008] To solve the above technical problems, the present invention specifically provides the following technical solutions:

[0009] An asphalt mixture proportioning design device, comprising: a frame; a jack disposed on the frame; a rotating member rotatably connected to the actuator of the jack, the axis of the rotating member being parallel to the lifting direction of the jack; a lower clamp detachably connected to a portion of the rotating member away from the jack; an upper clamp slidably connected to a portion of the lower clamp away from the rotating member, the upper clamp and the lower clamp being capable of approaching or separating from each other to clamp or release a specimen; a displacement sensor connected to the upper clamp and the lower clamp and used for measuring the distance change between the upper clamp and the lower clamp; a pressure sensor disposed on one side of the frame opposite to the jack, the jack being capable of lifting the rotating member so that the upper clamp contacts the pressure sensor; a push rod disposed on the frame and at least on one side of the rotating member, the lower clamp never contacting the push rod, and a portion of the upper clamp facing the lower clamp being capable of contacting or not contacting the push rod through the rotation of the rotating member.

[0010] Further, the lower clamp includes a first clamping portion and first connecting portions connected to both sides of the first clamping portion, and a first clamping opening is formed on a surface of the first clamping portion facing the upper clamp; the upper clamp includes a second clamping portion and second connecting portions connected to both sides of the second clamping portion, the first connecting portion and the second connecting portion are slidably connected through a guiding member, and a second clamping opening capable of splicing with the first clamping opening into a circular hole is formed on a surface of the second connecting portion facing the lower clamp; both the first connecting portion and the second connecting portion are rectangular strips, and the length of the second connecting portion is greater than that of the first connecting portion, and the upper clamp contacts the push rod through the second connecting portion.

[0011] Further, the rotating member includes a slewing bearing, a column and a clamp support arranged in sequence from bottom to top, the outer ring of the slewing bearing is fixedly connected to the actuator of the jack, the inner ring of the slewing bearing is fixedly connected to the column, the column is a cylinder and its axis coincides with the axis of the slewing bearing, the clamp support is fixedly connected to the column, and the clamp support is detachably connected to the lower clamp.

[0012] Further, a clamping bar is formed on the top surface of the clamp support, the clamping bar extends along the horizontal direction, and a clamping groove slidably matched with the clamping bar is formed on the bottom surface of the first clamping portion.

[0013] Further, a chute is formed on the outer peripheral surface of the column, and a slider capable of slidingly mating with the chute is disposed beside the column. The slider is movably connected to the frame such that the slider can be inserted into the chute and fixed or disengaged from the chute. The chute includes a first guiding groove spirally extending 1 / 4 turn along the outer circumferential surface of the column, and the axis of the first guiding groove coincides with the axis of the column.

[0014] Further, a second guiding groove and a third guiding groove are respectively formed at two ends of the first guiding groove, and both the second guiding groove and the third guiding groove extend along a direction parallel to the axis of the column.

[0015] Further, the slider is connected to the frame through a rotating shaft, and the axis of the rotating shaft is parallel to the axis of the column. An entry groove and a disengagement groove extending along the horizontal direction are further formed on the column. Among them, the entry groove is formed below the first guiding groove and communicates with the second guiding groove, and the disengagement groove is formed above the first guiding groove and communicates with the third guiding groove. The slider can enter or disengage from the chute through the entry groove and the disengagement groove.

[0016] Further, air knives are disposed at positions of the frame facing the lower clamp and the upper clamp. The air knives are supplied with air by an air pump. The air outlet of the air pump is connected to the air inlet end of the air knife, and the air inlet of the air pump is connected to air through a pipeline. The parts other than the two ends of the pipeline are immersed in a constant temperature water tank; the air pump is communicatively connected to the displacement sensor through a controller. When the upper clamp contacts the ejector rod, the air flow output by the air knife can blow through the first clamping port and the second clamping port.

[0017] Further, a water permeable plate is installed inside the constant temperature water tank. The water permeable plate is disposed in the middle of the constant temperature water tank, and the pipeline is disposed below the water permeable plate.

[0018] Further, there are 2 ejector rods respectively located on both sides of the rotating member, and a ranging sensor is installed at the top end of each ejector rod. The sensing end of the ranging sensor horizontally faces between the lower clamp and the upper clamp.

[0019] The present application has the following beneficial effects compared with the prior art:

[0020] Provided is a device for designing the mix proportion of asphalt mixture. By rotatably connecting the lower fixture to the actuator of the jack around a vertical axis, the jack can not only apply a thrust to the lower fixture but also apply a pulling force to the lower fixture. And a push rod is arranged on the frame, which can contact the bottom surface of the upper fixture without contacting the lower fixture. Before the test, the staff can rotate the lower fixture and the upper fixture to move them to a position where they are not obstructed by the push rod, and it is easy to adjust the position of the specimen so that it is located between the lower fixture and the upper fixture. After the test, the staff can rotate the lower fixture and the upper fixture so that when the upper fixture descends, it abuts against the push rod and stops moving, and the lower fixture continues to descend and thus separates from the upper fixture, facilitating the staff to replace the specimen. Description of the Drawings

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings described below are only exemplary, and for those of ordinary skill in the art, without creative efforts, other implementation drawings can also be obtained based on the provided drawings.

[0022] Figure 1 The front view of the sample loading state before the start of the test in the embodiment of the present invention;

[0023] Figure 2 is Figure 1 the sectional view in the A - A direction of

[0024] Figure 3 The perspective view of the sample loading completed state before the start of the test in the embodiment of the present invention;

[0025] Figure 4 The perspective view when applying pressure to the specimen in the embodiment of the present invention;

[0026] Figure 5 The perspective view of the process of resetting the specimen at the end of the test in the embodiment of the present invention;

[0027] Figure 6 The perspective assembly drawing of the upper fixture, lower fixture and rotating member in the embodiment of the present invention;

[0028] Figure 7 The perspective view of the upper fixture, lower fixture, rotating member, air knife, air pump and constant temperature water tank in the embodiment of the present invention;

[0029] The reference numerals in the drawings are respectively represented as follows:

[0030] 1 - Frame; 11 - Jack; 12 - Pressure Sensor; 13 - Ejector Rod; 14 - Slide Block; 141 - Rotating Shaft; 2 - Rotating Member; 21 - Slewing Bearing; 22 - Column; 221 - First Guide Groove; 222 - Second Guide Groove; 223 - Third Guide Groove; 224 - Entry Groove; 225 - Release Groove; 23 - Fixture Support; 231 - Locking Strip; 3 - Specimen; 31 - Lower Fixture; 311 - First Clamping Portion; 312 - First Connecting Portion; 313 - First Clamping Opening; 314 - Card Slot; 32 - Upper Fixture; 321 - Second Clamping Portion; 322 - Second Connecting Portion; 323 - Second Clamping Opening; 324 - Guide Member; 33 - Displacement Sensor; 4 - Distance Measuring Sensor; 41 - Display; 5 - Air Knife; 6 - Air Pump; 61 - Pipeline; 7 - Constant Temperature Water Tank; 71 - Permeable Plate. Detailed Embodiment

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] Since the existing strength testing equipment for asphalt mixture specimens 3 relies too much on manual operation, and it is necessary to repeatedly heat in a water bath and dry the fixtures during the test, which affects the test efficiency.

[0033] As Figures 1-5 shown, an embodiment of the asphalt mixture mix design equipment is provided to solve the above technical problems.

[0034] Its main structure includes: frame 1, jack 11, rotating member 2, lower fixture 31, upper fixture 32, displacement sensor 33, pressure sensor 12 and ejector rod 13.

[0035] The jack 11 is arranged on the frame 1;

[0036] The rotating member 2 is rotatably connected to the execution part of the jack 11, and the rotating shaft of the rotating member 2 is parallel to the jacking direction of the jack 11;

[0037] The lower fixture 31 is detachably connected to the part of the rotating member 2 away from the jack 11;

[0038] The upper fixture 32 is slidably connected to the part of the lower fixture 31 away from the rotating member 2, and the upper fixture 32 and the lower fixture 31 can approach or separate from each other to clamp or release the specimen 3;

[0039] The displacement sensor 33 is connected to the upper fixture 32 and the lower fixture 31 and is used to measure the distance change between the upper fixture 32 and the lower fixture 31;

[0040] The pressure sensor 12 is arranged on a side of the frame 1 opposite to the jack 11, and the jack 11 can lift the rotating member 2 so that the upper clamp 32 contacts the pressure sensor 12;

[0041] The push rod 13 is arranged on the frame 1 and at least located on one side of the rotating member 2 . The lower clamp 31 is always out of contact with the push rod 13 . The portion of the upper clamp 32 facing the lower clamp 31 can contact or not contact the push rod 13 through the rotation of the rotating member 2 .

[0042] like Figure 1 As shown, before the test, the staff installs the upper clamp 32 and the lower clamp 31 on the rotating part 2, and makes the upper clamp 32 avoid the push rod 13, then clamps the sample 3 between the upper clamp 32 and the lower clamp 31, and installs the displacement sensor 33 on the upper clamp 32 and the lower clamp 31.

[0043] like Figure 3 As shown, during the test, the jack 11 lifts the rotating part 2, the lower clamp 31 and the upper clamp 32 upward, so that the upper clamp 32 contacts the pressure sensor 12, and pressure is applied to the sample 3 through the jack 11 to test the strength of the sample 3. After a period of time, the industrial computer outputs the readings of the pressure sensor 12 and the displacement sensor 33, thereby obtaining the strength of the sample 3.

[0044] like Figure 1 As shown, after the test, the staff rotates the upper clamp 32 and the lower clamp 31 so that they rotate 90 degrees through the rotation of the rotating part 2, and then the jack 11 is reset. During the descending process of the upper clamp 32 and the lower clamp 31, the upper clamp 32 contacts the push rod 13 and stops moving, and the lower clamp 31 continues to descend and separates from the upper clamp 32. When the displacement sensor 33 detects that the distance between the lower clamp 31 and the upper clamp 32 is equal to the specified value, the jack 11 stops working.

[0045] Furthermore, in the present embodiment, the lower clamp 31 and the upper clamp 32 are different from the clamps of the conventional Marshall test, in order to achieve the technical effect that the ejector rod 13 can contact the upper clamp 32 but not the lower clamp 31 .

[0046] To this end, an optional embodiment of the lower clamp 31 and the upper clamp 32 is provided, such as Figure 6 As shown, its specific structure is described as follows.

[0047] The lower clamp 31 includes a first clamping portion 311 and first connecting portions 312 connected to both sides of the first clamping portion 311. A first clamping opening 313 is formed on one side of the first clamping portion 311 facing the upper clamp 32.

[0048] The upper fixture 32 includes a second clamping portion 321 and second connecting portions 322 connected to both sides of the second clamping portion 321. The first connecting portion 312 and the second connecting portion 322 are slidably connected through a guiding member 324. A second clamping opening 323 capable of splicing with the first clamping opening 313 to form a round hole is formed on the surface of the second connecting portion 322 facing the lower fixture 31.

[0049] Both the first connecting portion 312 and the second connecting portion 322 are rectangular strips, and the length of the second connecting portion 322 is greater than that of the first connecting portion 312. The upper fixture 32 contacts the ejector rod 13 through the second connecting portion 322.

[0050] Specifically, both the first clamping opening 313 and the second clamping opening 323 are fan-shaped ring openings with a central angle less than 180°. The guiding member 324 is a guide post. The guiding member 324 is slidably connected to the upper fixture 32 and fixedly connected to the lower fixture 31 through threads. The axis of the guiding member 324 is parallel to the axis of the column 22. The distance between the two ejector rods 13 is greater than the length of the first connecting portion 312 but less than the length of the second connecting portion 322.

[0051] Furthermore: An optional structure of the rotating member 2 is provided in this embodiment, and its specific structure is described as follows.

[0052] The rotating member 2 includes a slewing bearing 21, a column 22, and a fixture support 23 arranged in sequence from bottom to top. The outer ring of the slewing bearing 21 is fixedly connected to the actuator part of the jack 11, and the inner ring of the slewing bearing 21 is fixedly connected to the column 22. The column 22 is a cylinder and its axis coincides with the axis of the slewing bearing 21. The fixture support 23 is fixedly connected to the column 22, and the fixture support 23 is detachably connected to the lower fixture 31.

[0053] Specifically, flange plates are formed at both the actuator part of the jack 11 and the bottom of the column 22. The slewing bearing 21 connects the two flange plates through bolts. The slewing bearing 21 can bear the axial thrust applied by the jack 11 and make the column 22 easy to rotate.

[0054] Furthermore: Since the lower fixture 31 and the upper fixture 32 need to be disassembled and assembled frequently to wipe and clean the first clamping opening 313 and the second clamping opening 323, therefore, the fixture support 23 and the lower fixture 31 should be capable of being quickly disassembled and assembled and stably connected.

[0055] Therefore, an optional embodiment of the fixture support 23 is provided, and its specific structure is described as follows.

[0056] A clamping strip 231 is formed on the top surface of the fixture support 23. The clamping strip 231 extends along the horizontal direction. A clamping groove 314 slidably matched with the clamping strip 231 is formed on the bottom surface of the first clamping portion 311.

[0057] Specifically, the jacking direction of the jack 11 is perpendicular to the disassembly and assembly direction of the lower fixture 31, such that the lower fixture 31 only needs to be horizontally pulled to be connected to or separated from the fixture support 23.

[0058] Moreover, the card slot 314 is a dovetail groove, and the card strip 231 is a corresponding trapezoidal shape, such that the card strip 231 can apply a vertical pulling force to the lower fixture 31 through the card slot 314. When the actuator of the jack 11 descends and the bottom surface of the upper fixture 32 abuts against the ejector rod 13, the actuator of the jack 11 can drag the lower fixture 31 to separate it from the upper fixture 32.

[0059] Furthermore: Before the jack 11 drives the lower fixture 31 and the upper fixture 32 to rise, the lower fixture 31 and the upper fixture 32 need to clamp the specimen 3 to prevent the specimen 3 from shaking during the movement.

[0060] Then, before or during the descent of the jack 11 driving the lower fixture 31 and the upper fixture 32, the lower fixture 31 and the upper fixture 32 need to be rotated by 90 degrees so that the second connecting portion 322 can abut against the ejector rod 13 during the descent.

[0061] However, before the jack 11 drives the lower fixture 31 and the upper fixture 32 to descend, the upper fixture 32 abuts tightly against the pressure sensor 12, and the frictional force between the two is relatively large. At this time, it is relatively difficult to rotate the lower fixture 31 and the upper fixture 32, and it is easy to cause the pressure sensor 12 to be damaged by torsion.

[0062] Meanwhile, during the descent of the jack 11 driving the lower fixture 31 and the upper fixture 32, it is relatively dangerous to rotate the upper fixture 32, and it is easy to cause the staff to be pinched by the second connecting portion 322 and the ejector rod 13.

[0063] Therefore, an alternative embodiment of the device is provided below to solve the technical problem of how to rotate the lower fixture 31 and the upper fixture 32, as Figure 6 shown, and its specific structure is described as follows.

[0064] A chute is formed on the outer peripheral surface of the column 22. A slider 14 capable of slidingly cooperating with the chute is disposed beside the column 22. The slider 14 is movably connected to the frame such that the slider 14 can be inserted into the chute and fixed or disengaged from the chute. The chute includes a first guiding groove 221 that spirally extends 1 / 4 turn along the outer circumferential surface of the column 22, and the axis of the first guiding groove 221 coincides with the axis of the column 22.

[0065] As Figure 5As shown, the slider 14 is inserted into the slide groove. As the actuator of the jack 11 descends, the column 22 produces a spiral movement through the sliding cooperation between the first guide groove 221 and the slider 14 during the descent process, so that the column 22 rotates 90 degrees during the descent process and then contacts the push rod 13.

[0066] Then, when the actuator of the jack 11 is at the lowest point, the slider 14 is separated from the inside of the slide slot, so that when the actuator of the jack 11 rises, the column 22 does not rotate.

[0067] Furthermore, if the upper clamp 32 rotates and contacts the pressure sensor 12 or the push rod 13, the pressure sensor 12 and the push rod 13 will also be subjected to a torque in addition to the pressure, which may easily cause damage to the pressure sensor 12 and the push rod 13 and cause inaccurate readings of the pressure sensor 12.

[0068] To this end, an optional embodiment of the slide groove is provided, and its specific structure is described as follows.

[0069] A second guide groove 222 and a third guide groove 223 are respectively formed at two ends of the first guide groove 221 . The second guide groove 222 and the third guide groove 223 both extend in a direction parallel to the axis of the column 22 .

[0070] The second guide groove 222 and the third guide groove 223 are respectively formed at the bottom and top of the first guide groove 221 , and their functions are to enable the column 22 to perform the following actions in sequence: vertical movement, spiral movement, and vertical movement.

[0071] Therefore, the column 22 can only contact the pressure sensor 12 and the push rod 13 vertically, and will not apply a horizontal thrust to the pressure sensor 12 and the push rod 13 through friction.

[0072] Furthermore, when the jack 11 is lifted, the slider 14 has no contact with the column 22, and when the slider 14 is lowered, the slider 14 and the column 22 are slidably matched. In order to improve the efficiency of the test, it is necessary to make the slider 14 easy to insert into or out of the slide slot.

[0073] To this end, an optional embodiment is provided, and its specific structure is described as follows.

[0074] The slider 14 is connected to the frame 1 through a rotating shaft 141, the axis of the rotating shaft 141 is parallel to the axis of the column 22, and an entry groove 224 and a disengagement groove 225 extending in the horizontal direction are also formed on the column 22, wherein the entry groove 224 is formed below the first guide groove 221 and is connected to the second guide groove 222, and the disengagement groove 225 is formed above the first guide groove 221 and is connected to the third guide groove 223. The slider 14 can enter or disengage from the slide groove through the entry groove 224 and the disengagement groove 225.

[0075] The slider 14 rotates through the rotating shaft 141 so that when the actuator of the jack 11 is at the highest point, the slider 14 can rotate and then enter the inside of the chute through the entry slot 224.

[0076] To prevent the slider 14 from rotating and detaching from the chute when the actuator of the jack 11 moves up and down, the rotating shaft 141 is formed by connecting a bolt and a threaded sleeve. By loosening the bolt and the threaded sleeve, the slider 14 can rotate; by tightening the bolt and the threaded sleeve, the slider 14 cannot rotate.

[0077] The slider 14 can also be fixed and unfixed in other ways. For example, holes that cooperate with pins are formed on the slider 14 and the frame 1. Inserting a pin into the hole can fix the slider 14 so that it cannot rotate, and pulling out the pin can enable the slider 14 to rotate.

[0078] Furthermore, during the test process, if the temperatures of the lower fixture 31 and the upper fixture 32 drop rapidly, the lower fixture 31 and the upper fixture 32 need to be reheated repeatedly. Each time of heating requires placing the lower fixture 31 and the upper fixture 32 in hot water at 60°C and keeping them at a constant temperature for 40 minutes. The heating time is relatively long, seriously affecting the test efficiency.

[0079] Therefore, an alternative embodiment is provided, as Figure 7 shown, and its specific structure is described as follows.

[0080] An air knife 5 is arranged at the position of the frame 1 facing the lower fixture 31 and the upper fixture 32. The air knife 5 is supplied with air by an air pump 6. The air outlet of the air pump 6 is connected to the air inlet end of the air knife 5, and the air inlet of the air pump 6 is connected to air through a pipeline 61. The parts other than the two ends of the pipeline 61 are immersed in a constant temperature water tank 7;

[0081] The air pump 6 is communicatively connected to the displacement sensor 33 through a controller. When the upper fixture 32 contacts the ejector rod 13, the air flow output by the air knife 5 can blow through the first clamping port 313 and the second clamping port 323.

[0082] Specifically, the constant temperature water tank 7 is a constant temperature electric boiler, which has a relatively high boiler wall to hold a large amount of hot water. The constant temperature water tank 7 can be used for water bath heating of the specimen 3, the lower fixture 31 and the upper fixture 32.

[0083] The displacement sensor 33 is communicatively connected to the air pump 6 through a controller. When the distance between the lower clamp 31 and the upper clamp 32 is equal to a specified value, the jack 11 stops working, and at the same time, the air pump 6 starts working. The air pump 6 sucks air from the atmosphere and sprays it through the air knife 5 towards the lower clamp 31 and the upper clamp 32. The air undergoes heat exchange with the hot water stored in the constant temperature water tank 7 in the pipeline 61, so that the air knife 5 can spray a constant-temperature high-speed air flow towards the lower clamp 31 and the upper clamp 32. The air flow heats the parts of the lower clamp 31 and the upper clamp 32 for clamping the specimen 3. Until after the lower clamp 31 and the upper clamp 32 clamp the specimen 3 again, when the distance between the lower clamp 31 and the upper clamp 32 changes, the air pump 6 stops working.

[0084] On the other hand, when the distance between the lower clamp 31 and the upper clamp 32 is equal to the specified value, the first clamping port 313, the second clamping port 323 and the gap therebetween form an oval shape, and the air outlet end of the air knife 5 is also the same oval shape, so that the air flow output by the air knife 5 fits the wall surfaces of the first clamping port 313 and the second clamping port 323, so that the air knife 5 can also clean the wall surfaces of the lower clamp 31 and the upper clamp 32 and blow away the remaining parts of the specimen 3.

[0085] Furthermore: Since the specimen 3, the lower clamp 31 and the upper clamp 32 need to be heated by water bath, it is difficult to separate the three from the pipeline 61.

[0086] For this reason, an alternative embodiment is provided, and its specific structure is described as follows.

[0087] A water permeable plate 71 is installed inside the constant temperature water tank 7. The water permeable plate 71 is arranged in the middle of the constant temperature water tank 7, and the pipeline 61 is arranged below the water permeable plate 71.

[0088] The water permeable plate 71 is a grid plate. Before the test, the staff places the upper clamp 32, the lower clamp 31 and the specimen 3 on the water permeable plate 71, so that the specimen 3, the lower clamp 31 and the upper clamp 32 are immersed in hot water for heating. After keeping warm for 40 minutes, take them out, dry them, and then place them on the rotating member 2.

[0089] To sum up, the constant temperature water tank 7 can serve two purposes. It can not only provide the water bath heating function for the specimen 3, the lower clamp 31 and the upper clamp 32, but also form a heat exchanger in combination with the pipeline 61 to provide a constant-temperature heating function for the air flow at the output end of the air knife 5.

[0090] Furthermore: In this embodiment, when the staff places the specimen 3 centrally between the lower clamp 31 and the upper clamp 32, the column 22 can be rotated 90 degrees first to make the upper clamp 32 away from the ejector rod 13. At this time, the two end faces of the lower clamp 31 and the upper clamp 32 are close to their left and right hands, and then the displacement sensor 33 is centered by visual inspection, but visual inspection is not accurate enough.

[0091] To this end, an alternative embodiment is provided, and its specific structure is described as follows.

[0092] The ejector rods 13 are two in number and are respectively located on both sides of the rotating member 2. A distance measuring sensor 4 is installed at the top end of each ejector rod 13, and the sensing end of the distance measuring sensor 4 faces horizontally towards the space between the lower fixture 31 and the upper fixture 32.

[0093] The distance measuring sensor 4 is a laser rangefinder. The staff places the specimen 3 between the lower fixture 31 and the upper fixture 32, and then rotates the rotating member 2 by 90 degrees so that the upper fixture 32 moves away from the ejector rod 13. At this time, the specimen 3 is exactly located between the two distance measuring sensors 4, and the two end faces of the specimen 3 are facing the sensing ends of the two distance measuring sensors 4.

[0094] The distance measuring sensor 4 is used to detect the distances between the two end faces of the specimen 3 and itself, and feeds back the difference between the two distances to the staff, which is convenient for the staff to adjust the position of the specimen 3. After the specimen 3 is adjusted to a substantially central position, the staff manually presses down the upper fixture 32 so that the upper fixture 32 and the lower fixture 31 gently clamp the specimen 3 to prevent the specimen 3 from shaking during the operation of the jack 11.

[0095] Further: To facilitate the staff to observe whether the specimen 3 is centered and manually adjust the position of the specimen 3, the distance measuring sensor 4 is communicatively connected to a display 41 through a controller. The display 41 is arranged on the frame 1, and the distance measuring sensor 4 is located between the two ejector rods 13.

[0096] The display 41 is used to display the position of the specimen 3. For example, when the specimen 3 deviates 5 mm to the right hand direction, the display 41 shows +5, and when the specimen 3 deviates 2 mm to the left hand direction, the display 41 shows -2.

[0097] The above embodiments are only exemplary embodiments of the present invention and are not used to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements within the essence and protection scope of the present invention, and such modifications or equivalent replacements should also be regarded as falling within the protection scope of the embodiments of the present invention.

Claims

1. An asphalt mixture mix design device, characterized in that, Including: Frame (1); Jack (11), arranged on the frame (1); Rotating member (2), rotatably connected to the actuator of the jack (11), and the axis of the rotating member (2) is parallel to the lifting direction of the jack (11); Lower clamp (31), detachably connected to the part of the rotating member (2) away from the jack (11); Upper clamp (32), slidably connected to the part of the lower clamp (31) away from the rotating member (2), and the upper clamp (32) and the lower clamp (31) can approach or move away from each other to clamp or release the specimen (3); Displacement sensor (33), connecting the upper clamp (32) and the lower clamp (31) and used to measure the distance change between the upper clamp (32) and the lower clamp (31); Pressure sensor (12), arranged on one side of the frame (1) opposite to the jack (11), and the jack (11) can lift the rotating member (2) so that the upper clamp (32) contacts the pressure sensor (12); Ejector rods (13), there are 2 and are respectively located on both sides of the rotating member (2), a ranging sensor (4) is installed at the top of each ejector rod (13), the sensing end of the ranging sensor (4) faces horizontally between the lower clamp (31) and the upper clamp (32), the lower clamp (31) never contacts the ejector rod (13), and the part of the upper clamp (32) facing the lower clamp (31) can contact or not contact the ejector rod (13) through the rotation of the rotating member (2); Wherein, the rotating member (2) includes a slewing bearing (21), a column (22) and a clamp support (23) arranged in sequence from bottom to top, the outer ring of the slewing bearing (21) is fixedly connected to the actuator of the jack (11), the inner ring of the slewing bearing (21) is fixedly connected to the column (22), the column (22) is a cylinder and its axis coincides with the axis of the slewing bearing (21), and the clamp support (23) is fixedly connected to the column (22); A chute is formed on the outer peripheral surface of the column (22), a slider (14) capable of slidingly cooperating with the chute is arranged beside the column (22), and the slider (14) is movably connected to the frame so that the slider (14) can be inserted into the chute and be fixed or separated from the chute. The chute includes a first guiding groove (221) spirally extending along the outer circumferential surface of the column (22), and the axis of the first guiding groove (221) coincides with the axis of the column (22).

2. The asphalt mixture mix design device according to claim 1, characterized in that The lower clamp (31) includes a first clamping part (311) and first connecting parts (312) connected to both sides of the first clamping part (311), and a first clamping opening (313) is formed on the surface of the first clamping part (311) facing the upper clamp (32); The upper fixture (32) includes a second clamping portion (321) and second connecting portions (322) connected to both sides of the second clamping portion (321). The first connecting portion (312) and the second connecting portion (322) are slidably connected through a guide member (324). A second clamping opening (323) capable of splicing with the first clamping opening (313) to form a round hole is formed on a surface of the second connecting portion (322) facing the lower fixture (31). Both the first connecting portion (312) and the second connecting portion (322) are rectangular strips, and the length of the second connecting portion (322) is greater than the length of the first connecting portion (312). The upper fixture (32) contacts the ejector rod (13) through the second connecting portion (322).

3. The asphalt mixture proportion design device according to claim 2, characterized in that The fixture support (23) is detachably connected to the lower fixture (31).

4. The asphalt mixture proportion design device according to claim 3, characterized in that A clamping bar (231) is formed on the top surface of the fixture support (23). The clamping bar (231) extends along the horizontal direction. A clamping groove (314) slidably engaged with the clamping bar (231) is formed on the bottom surface of the first clamping portion (311).

5. The asphalt mixture proportion design device according to claim 3 or 4, characterized in that The first guide groove (221) spirally extends 1 / 4 turn along the outer circumferential surface of the column (22).

6. The asphalt mixture proportion design device according to claim 5, characterized in that Second guide grooves (222) and third guide grooves (223) are respectively formed at two ends of the first guide groove (221). Both the second guide groove (222) and the third guide groove (223) extend along a direction parallel to the axis of the column (22).

7. The asphalt mixture proportion design device according to claim 6, characterized in that The slider (14) is connected to the frame (1) through a rotating shaft (141). The axis of the rotating shaft (141) is parallel to the axis of the column (22). An entry groove (224) and a detachment groove (225) extending along the horizontal direction are further formed on the column (22). Among them, the entry groove (224) is formed below the first guide groove (221) and communicates with the second guide groove (222), and the detachment groove (225) is formed above the first guide groove (221) and communicates with the third guide groove (223). The slider (14) can enter or detach from the chute through the entry groove (224) and the detachment groove (225).

8. The asphalt mixture proportion design device according to claim 2, characterized in that A air knife (5) is arranged at the position of the frame (1) facing the lower fixture (31) and the upper fixture (32). The air knife (5) is supplied with air by an air pump (6). The air outlet of the air pump (6) is connected to the air inlet end of the air knife (5). The air inlet of the air pump (6) is connected to air through a pipeline (61), and the part other than the two ends of the pipeline (61) is immersed in a constant temperature water tank (7). The air pump (6) is communicatively connected to the displacement sensor (33) through a controller. When the upper fixture (32) contacts the ejector rod (13), the air flow output by the air knife (5) can blow through the first clamping port (313) and the second clamping port (323).

9. An asphalt mixture proportion design device according to claim 8, wherein A permeable plate (71) is installed inside the constant temperature water tank (7). The permeable plate (71) is arranged in the middle of the constant temperature water tank (7), and the pipeline (61) is arranged below the permeable plate (71).

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