A road asphalt concrete strength detection device

Abstract

The present invention belongs to the technical field of asphalt concrete detection, and particularly relates to a road asphalt concrete strength detection device, which includes a base body. A detection mechanism is arranged on the base body. The detection mechanism includes a bottom tray, and the bottom tray is installed on the upper surface of the base body through a first electric push rod; a specimen clamp is installed on the bottom tray. The specimen clamp includes a lower pressing plate; the lower pressing plate is connected to the bottom tray through a plug-in limiting mechanism, and the upper surface of the lower pressing plate is suspended and supported by a plurality of guide rods with an upper pressing plate. Pad strips are detachably installed on the corresponding surfaces of the upper pressing plate and the lower pressing plate; two sets of top-pushing and expanding mechanisms are arranged on the lower pressing plate, and the top-pushing and expanding mechanisms are used to push and separate the upper pressing plate from the lower pressing plate. The present invention can not only improve the safety of opening the specimen clamp, but also stably clamp specimens with different diameters, thereby facilitating improving the stability and safety of the detection device of the present invention for detecting the strength of asphalt concrete.

Description

Technical Field

[0001] The present invention belongs to the technical field of asphalt concrete detection, and particularly relates to a road asphalt concrete strength detection device. Background Art

[0002] Asphalt concrete, commonly known as asphalt concrete, is a mixture made by artificially selecting mineral materials with a certain gradation composition and a certain proportion of road asphalt materials and mixing them under strictly controlled conditions. Asphalt concrete can be divided into two categories: those using petroleum asphalt and those using coal asphalt. Asphalt concrete needs to be subjected to a pre-test before use.

[0003] Most of the existing equipment or instruments for detecting the strength of asphalt concrete use the asphalt concrete sampled by a splitting test instrument for strength detection; the detection unit and the fixture unit of the existing splitting test instrument are separately arranged, and the clamping of the specimen by the fixture unit is mostly carried out by manually opening it. Obviously, this method is not only prone to safety hazards when the specimen of asphalt concrete is subjected to strength detection, but also affects the quick and stable clamping of specimens of different sizes by the fixture unit, and further affects the stability and safety of the detection equipment for detecting the strength of asphalt concrete. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention is realized through the following technical solutions:

[0005] The present invention is a road asphalt concrete strength detection device, including a base body, and a detection mechanism is arranged on the base body. The detection mechanism includes a bottom tray, and the bottom tray is installed on the upper surface of the base body through a first electric push rod; a specimen fixture is installed on the bottom tray. The specimen fixture includes a lower pressing plate; the lower pressing plate is connected to the bottom tray through a plug-in limiting mechanism, and the upper surface of the lower pressing plate is suspended and supported by a plurality of guide rods with an upper pressing plate. Pad strips are detachably installed on the corresponding surfaces of the upper pressing plate and the lower pressing plate; two sets of top-pushing and expanding mechanisms are arranged on the lower pressing plate, and the top-pushing and expanding mechanisms are used to push the upper pressing plate to separate from the lower pressing plate.

[0006] Furthermore, the detection mechanism further includes vertical brackets, the symmetrical vertical brackets are fixedly arranged on the base body, the tops of the two vertical brackets are fixedly provided with a cross beam frame, and a second electric push rod is fixedly arranged on the cross beam frame. The end of the output rod of the second electric push rod is detachably insulated with a connecting piece, and a sensor is installed on the connecting piece.

[0007] Further, the pushing and expanding mechanism includes a pushing tube. Countersunk holes penetrating through are symmetrically formed on the upper surface of the lower pressing plate, and bushings are installed at the bottom holes of the countersunk holes. A pushing tube is slidably inserted into the bushings. A limiting ring is fixedly provided at the top of the pushing tube, and its bottom slides through the bushing and contacts the upper surface of the base body. A spring member is sleeved on the pushing tube, and the upper end of the spring member is connected to the limiting ring, and its lower end is connected into the countersunk hole.

[0008] Further, the pushing and expanding mechanism further includes a hose sleeve. Hose sleeves are sleeved on the outer walls of multiple guide rods and the pushing tube, and the bottom of the hose sleeve is connected to the upper surface of the lower pressing plate. Adjacent two hose sleeves are connected through an elastic protective layer. The upper pipe orifice of the hose sleeve located outside the pushing tube is connected to the limiting ring. A missing orifice is formed on the elastic protective layer on the back surfaces of the upper pressing plate and the lower pressing plate, and a baffle is detachably installed on the missing orifice.

[0009] Further, the pushing and expanding mechanism further includes a support rod. The support rod is inserted upward into the bottom of the pushing tube, and the top of the support rod is connected to the top of the pushing tube through a spring member. A bladder tube is arranged inside the pushing tube, and the upper and lower pipe orifices of the bladder tube are respectively connected to the support rod and the top of the pushing tube, and the bladder tube is located inside the spring member. The upper pipe orifice of the bladder tube is connected to an air guide tube, and the upper pipe orifice of the air guide tube extends out of the top of the upper pressing plate.

[0010] Further, the plugging and limiting mechanism includes a square plug. A square jack is formed at the center of the bottom tray, and a square plug is inserted into the square jack. The square plug is fixedly provided on the lower surface of the lower pressing plate. At least two support long rods are fixedly provided on the outer circumferential surface of the bottom tray, and through holes formed at the outer ends of the support long rods are sleeved on the outer wall of the bushing extending downward, and the upper surface of the support long rod contacts the lower pressing plate.

[0011] Further, the plugging and limiting mechanism further includes a horizontal plug strip. Sliding guide grooves are formed inside the support long rods and the bottom plate tray, and the sliding guide grooves communicate with the square jack. At least two limiting jacks are formed on the square plug. A horizontal plug strip is slidably inserted into the sliding guide groove, and the end of the horizontal plug strip close to the square jack is inserted and matched with the limiting jack. The other end of the horizontal plug strip is connected to the groove wall of the sliding guide groove through the cooperation of a sealing block and a spring member. An air guide valve is communicated with the bottom of the sliding guide groove far from the square jack. The bottom of the valve orifice of the air guide valve is detachably connected to an air guide hose. A notch hole is formed on the side wall of the bottom of the pushing tube. A strip-shaped notch is vertically formed on the support rod located at the bottom of the pushing tube. The other end pipe orifice of the air guide hose passes through the notch hole and the strip-shaped notch and is communicated with the bladder tube.

[0012] Further, multiple guide rods are located at the four corners of the lower pressing plate, and the top end of each guide rod slides through a guide kit installed on the upper pressing plate and is connected with a nut member.

[0013] The present invention has the following beneficial effects:

[0014] 1. The present invention removably fixes the sample clamp on the bottom tray through an inserting limit mechanism, which can prevent the pushing and expanding mechanism from moving downward on the bottom tray. When the upper pressure plate and the lower pressure plate are separated, the sample clamp is separated and falls from the bottom tray. This will not only affect the stable clamping of the sample clamp to the sample to be tested, but also affect the pushing and expanding mechanism to separate the upper and lower pressure plates. Since the upper and lower pressure plates are automatically separated and opened, there is no need for the operator to manually open the upper and lower pressure plates, which can not only improve the safety of opening the sample clamp, but also stably clamp samples of different diameters, thereby facilitating the improvement of the stability and safety of the testing equipment of the present invention in testing the strength of asphalt concrete.

[0015] 2. The present invention arranges the push tube and the spring member on the lower pressure plate for sliding movement, so that the upper pressure plate and the lower pressure plate can follow the movement of the bottom tray in different directions up and down to realize automatic opening and clamping and fixing of the sample, and will not affect the bottom tray driving the clamped sample to move upward to contact the detection sensor, so as to realize splitting or compressive strength testing of the sample to be tested. When the sample is undergoing strength testing, the bottom tray drives the push tube 41 to move upward, and thus will not interfere with the contact between the upper pressure plate and the detection sensor, and the normal splitting or squeezing of the columnar sample or the block sample. Moreover, since the push tube slides downward and passes through the lower pressure plate, it will not interfere with the minimum distance after the upper pressure plate and the lower pressure plate are separated. Therefore, the sample clamp can perform splitting or compressive strength testing on samples of different diameters or thicknesses, thereby improving the efficiency and accuracy of the testing equipment in concrete strength testing.

[0016] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of the overall structure disclosed in the present invention;

[0019] Figure 2 It is a structural schematic diagram of the sample fixture disclosed in the present invention;

[0020] Figure 3 It is a schematic diagram of the back side of the sample holder disclosed in the present invention;

[0021] Figure 4Schematic diagram of the internal structure of the specimen fixture disclosed by the present invention;

[0022] Figure 5 Schematic diagram of the bottom structure of the specimen fixture disclosed by the present invention;

[0023] Figure 6 Partial cross-sectional view of the lower pressure plate of the present invention;

[0024] Figure 7 Partial cross-sectional view of the bottom tray of the present invention.

[0025] In the figure: 1. Base body;

[0026] 2. Detection mechanism; 21. Bottom tray; 22. Square jack; 23. Second electric push rod; 24. Vertical support; 25. Cross beam frame; 26. Connector; 27. Detection sensor;

[0027] 3. Specimen fixture; 31. Lower pressure plate; 311. Countersunk hole; 32. Guide rod; 33. Upper pressure plate; 34. Pad strip; 35. Nut part;

[0028] 4. Thrust expansion mechanism; 41. Thrust pipe; 411. Notch hole; 42. Guide sleeve; 43. Limit ring; 44. Spring part; 45. Hose sleeve; 46. Elastic protective layer; 47. Elastic baffle; 48. Support rod; 481. Strip notch; 49. Bladder tube; 491. Air guide pipe;

[0029] 5. Plug-in limit mechanism; 51. Square plug; 511. Limit jack; 52. Support long rod; 521. Sliding guide groove; 53. Horizontal insert bar; 54. Sealing block; 55. Air guide valve; 56. Air guide hose. Detailed implementation manners

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with 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. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0031] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "periphery", etc. indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0032] Please refer to Figures 1-7As shown in the figure, the present invention is a road asphalt concrete strength detection device, including a base body 1, on which a detection mechanism 2 is arranged. The detection mechanism 2 includes a bottom tray 21, and the bottom tray 21 is installed on the upper surface of the base body 1 through a first electric push rod; a specimen clamp 3 is installed on the bottom tray 21. The specimen clamp 3 includes a lower pressing plate 31; the lower pressing plate 31 is connected to the bottom tray 21 through a plug-in limiting mechanism 5, and the upper surface of the lower pressing plate 31 is suspended and supported by a plurality of guide rods 32 with an upper pressing plate 33. Pad strips 34 are detachably installed on the corresponding surfaces of the upper pressing plate 33 and the lower pressing plate 31; two sets of top-pushing and expanding mechanisms 4 are arranged on the lower pressing plate 31, and the top-pushing and expanding mechanisms 4 are used to push the upper pressing plate 33 to separate from the lower pressing plate 31.Specifically, when the strength of the specimen needs to be detected, first control the output rod of the first electric push rod on the base body 1 to extend, so that it drives the bottom tray 21 to rise to the highest position. Then place the lower pressing plate 31 of the specimen clamp 3 on the bottom tray 21, and make it fixedly connected with the bottom tray 21 through the plug-in limiting mechanism 5. At this time, the upper pressing plate 33 and the lower pressing plate 31 will be attached to each other through the upper and lower cushion strips 34. When the bottom tray 21 moves downward, at this time, the top-pushing and expanding mechanism 4 will drive the upper pressing plate 33 to move upward relative to the lower pressing plate 31 to open, and the plurality of guide rods 32 can play a role in guiding and sliding the upper pressing plate 33. The tester can control the downward movement distance of the bottom tray 21 according to the diameter of the specimen to be subjected to splitting test, so as to facilitate controlling the distance between the separated upper pressing plate 33 and the lower pressing plate 31. Then place the specimen to be tested between the two cushion strips 34 separated up and down. Then, according to the need, control the bottom tray 21 to move upward, so that the top-pushing and expanding mechanism 4 is disengaged from the top-pushing of the upper pressing plate 33, and the cushion strip 34 on the upper pressing plate 33 contacts the specimen. Then, as the bottom tray 21 continues to rise under the push of the first electric push rod, the specimen clamp 3 will contact the testing mechanism 2, so as to facilitate the splitting strength test of the clamped specimen, and thus can accurately and quickly detect the strength of the asphalt concrete. When the specimen test is completed, the downward movement of the bottom tray 21 will cause the upper pressing plate 33 to move upward relatively, so as to facilitate the automatic opening of the specimen clamp 3 to disengage from the tested specimen. Then take out the tested specimen. The specimen clamp 3 can be detachably fixed on the bottom tray 21 through the plug-in limiting mechanism 5, which can prevent the phenomenon that the specimen clamp 3 separates and drops from the bottom tray 21 when the top-pushing and expanding mechanism 4 separates the upper pressing plate 33 and the lower pressing plate 31 when the bottom tray 21 moves downward. This will not only affect the stable clamping of the specimen to be tested by the specimen clamp 3, but also affect the top-pushing and separating of the upper pressing plate 33 and the lower pressing plate 31 by the top-pushing and expanding mechanism 4. Since the upper pressing plate 33 and the lower pressing plate 31 are automatically separated and opened, there is no need for the operator to manually open the upper pressing plate 33 and the lower pressing plate 31, which can not only improve the safety of opening the specimen clamp 3, but also stably clamp specimens of different diameter sizes, thus facilitating improving the stability and safety of the detection equipment of the present invention for detecting the strength of asphalt concrete;Preferably, the cushion strips 34 on the upper pressing plate 33 and the lower pressing plate 31 can be disassembled so that the upper pressing plate 33 and the lower pressing plate 31 can stably clamp the sample of blocky asphalt concrete. At this time, the bottom tray 21 can push the sample fixture 3 holding the blocky sample to rise and contact the detection mechanism 2. At this time, the top-pushing and expanding mechanism 4 no longer exerts a top thrust on the upper pressing plate 33. Then, the detection mechanism 2 can drive the detection sensor 27 to move downward to contact the upper pressing plate 33. As the detection sensor 27 continuously applies pressure to the upper pressing plate 33, the compressive strength detection of the asphalt concrete can be realized, thereby improving the universality of the detection equipment for the strength detection of asphalt concrete.

[0033] In this embodiment, the detection mechanism 2 further includes a vertical bracket 24. The symmetrical vertical brackets 24 are fixedly arranged on the base body 1. The top of the two vertical brackets 24 is fixedly provided with a cross beam frame 25. A second electric push rod 23 is fixedly arranged on the cross beam frame 25. The end of the output rod of the second electric push rod 23 is detachably insulated with a connecting piece 26, and a detection sensor 27 is installed on the connecting piece 26. Specifically, the height of the vertical bracket 24 will not interfere with the installation and fixation of the sample fixture 3 by the rising of the bottom tray 21, and at the same time, it will not interfere with the rising of the sample held by the sample fixture 3 and the contact with the detection sensor 27. The second electric push rod 23 on the cross beam frame 25 can adjust the height of the detection sensor 27 at any time, so that it will not interfere with the normal rising of the bottom tray 21 for the installation of the sample fixture 3, and at the same time, it is convenient to quickly perform splitting strength detection on the sample held by the sample fixture 3. The detection sensor 27 is preferably a sensor capable of performing strength detection such as a pressure sensor or a displacement sensor.

[0034] In this embodiment, the push-expanding mechanism 4 includes a push tube 41, and the upper surface of the lower pressure plate 31 is symmetrically provided with a through countersunk hole 311, and the bottom hole of the countersunk hole 311 is installed with a guide sleeve 42, and the push tube 41 is slidably inserted in the guide sleeve 42, and the top of the push tube 41 is fixed with a limit ring 43, and its bottom slides through the guide sleeve 42 and contacts the upper surface of the base body 1, and a spring member 44 is sleeved on the push tube 41, and the upper end of the spring member 44 is connected to the limit ring 43, and the lower end thereof is connected to the countersunk hole 311; specifically, when the bottom tray 21 drives the sample fixture 3 to descend, the bottom of the push tube 41 extending out of the lower pressure plate 31 will contact the upper surface of the base body 1, and because the lower pressure plate The upper and lower plates 31 are fixedly connected to the bottom tray 21 by the plug-in limit mechanism 5. Therefore, as the bottom tray 21 continues to descend, the limit ring 43 on the top of the push tube 41 will push the upper pressure plate 33 to slide upward along the multiple guide rods 32 and separate from the lower pressure plate 31. At this time, the spring member 44 located in the countersunk hole 311 will be stretched. When the distance between the upper and lower pressure plates 33 and the lower pressure plates 31 is greater than the diameter or height of the sample to be tested, the sample to be tested is placed between the upper and lower pads 34 or the disassembled upper and lower pressure plates 33 and the lower pressure plates 31. At this time, the bottom tray 21 continues to rise, which will cause the bottom of the push tube 41 to break away from the contact with the base body 1, and then the elastic restoring force of the two spring members 44 will pull the limit ring 43 on the top of the push tube 41. The positioning ring 43 is disengaged from the push on the upper pressure plate 33, and the push tube 41 slides downward in the guide sleeve 42, so that the upper pressure plate 33 will contact the sample under the action of its own gravity, so that it is convenient for the upper pressure plate 33 and the lower pressure plate 31 to clamp and fix the sample to be tested, and then as the bottom tray 21 continues to rise, the sample clamp 3 will drive the clamped sample to contact the detection sensor 27 to achieve splitting or compressive strength testing of the sample; and then, by sliding the push tube 41 and the spring member 44 on the lower pressure plate 31, the upper pressure plate 33 and the lower pressure plate 31 can follow the movement of the bottom tray 21 in different directions up and down to achieve automatic opening and clamping of the sample, and will not affect the bottom tray 21 drives the clamped sample to move upward and contact the detection sensor 27, so as to realize splitting or compressive strength test on the sample to be tested. When the sample is undergoing strength test, the bottom tray 21 drives the push tube 41 to move upward, and thus will not interfere with the contact between the upper pressure plate 33 and the detection sensor 27, and the normal splitting or squeezing of the columnar sample or block sample. Moreover, since the push tube 41 slides downward through the lower pressure plate 31, it will not interfere with the minimum distance after the upper pressure plate 33 and the lower pressure plate 31 are separated. Therefore, the sample fixture 3 can perform splitting or compressive strength test on samples of different diameters or thicknesses, thereby improving the efficiency and accuracy of the detection equipment in concrete strength detection.

[0035] In this embodiment, the pushing and expanding mechanism 4 further includes a hose sleeve 45. The outer walls of a plurality of guide rods 32 and the pushing tube 41 are sleeved with the hose sleeve 45, and the bottom of the hose sleeve 45 is connected to the upper surface of the lower pressing plate 31. The adjacent two hose sleeves 45 are connected by an elastic protective layer 46. The upper nozzle of the hose sleeve 45 located outside the pushing tube 41 is connected to the limiting ring 43. An opening cavity is formed in the elastic protective layer 46 on the back surfaces of the upper pressing plate 33 and the lower pressing plate 31, and an elastic baffle 47 is detachably installed on the opening cavity.

[0036] Specifically, when the pushing tube 41 slides upward relative to the guide sleeve 42 of the lower pressing plate 31, at this time, the limiting ring 43 will drive the compressed hose sleeve 45 to stretch upward. The hose sleeves 45 outside the guide rod 32 and the pushing tube 41 are connected by the elastic protective layer 46. Therefore, the upward stretching of the hose sleeve 45 will drive the elastic protective layer 46 surrounded by elasticity to stretch, so as to block the flying residues generated by the specimen being split or subjected to compressive testing, and prevent the flying residues from posing a safety hazard to the testing personnel. After the upper pressing plate 33 is separated from the lower pressing plate 31 and the elastic protective layer 46 is separated, at this time, the specimen to be tested is placed between the upper and lower cushion strips 34 through the opening cavity formed on the back surface of the elastic protective layer 46 surrounded by a square. Then, the elastic baffle 47 is installed in the opening cavity to achieve alignment and sealing. After the splitting or compressive strength test of the specimen is completed, at this time, the upper pressing plate 33 and the lower pressing plate 31 are opened to the maximum distance, and then the elastic baffle 47 is removed from the opening cavity, so as to facilitate the removal and cleaning of the tested specimen from between the upper pressing plate 33 and the lower pressing plate 31.

[0037] In this embodiment, the pushing and expanding mechanism 4 further includes a support rod 48. The bottom of the pushing tube 41 is inserted upward with the support rod 48, and the top of the support rod 48 is connected to the top of the pushing tube 41 through a spring member 44. A bladder tube 49 is arranged in the pushing tube 41, and the upper and lower nozzles of the bladder tube 49 are respectively connected to the support rod 48 and the top of the pushing tube 41, and the bladder tube 49 is located inside the spring member 44. The upper nozzle of the bladder tube 49 is connected to an air duct 491, and the upper nozzle of the air duct 491 extends out of the top of the upper pressing plate 33.

[0038] Specifically, to prevent the bottom tray 21 from having a relatively high vertical height, which may cause the push tube 41 to slide downward to an overly low position under the elastic pulling of the spring member 44, resulting in the elastic protection layer 46 formed into a square being lower than the middle part of the clamped specimen, thus affecting the blocking of the fragments generated by the specimen during splitting or compressive testing by the elastic protection layer 46. Therefore, a support rod 48 is provided inside the bottom of the push tube 41. When the bottom tray 21 drives the clamped specimen to move upward, at this time, the push tube 41 will move downward a certain distance relative to it, causing the limit ring 43 to be lower than the lower surface of the cushion strip 34 on the lower surface of the upper pressure plate 33. Then, control the air pump connected to the air guide tube 491 to work, so that the gas will enter the bladder tube 49 through the air guide tube 491. The bladder tube 49 will expand inside the push tube 41, and then push the bottom of the support rod 48 to slide downward. At this time, the spring member 44 at the top will be stretched, and then the downward-sliding support rod 48 will contact the upper surface of the base body 1, thus facilitating the support of the push tube 41, enabling the elastic protection layer 46 formed into a square after stretching to normally protect the flying fragments generated by the specimen during splitting or compressive testing. At this time, the distance between the limit ring 43 and the upper pressure plate 33 will not interfere with the normal descent of the upper pressure plate 33 to perform strength testing on the specimen to be tested. When it is necessary to take out the tested specimen, at this time, the descent of the bottom tray 21 will control the extraction of the gas in the bladder tube 49 as needed, so that the bladder tube 49 will contract under the pulling of the spring member 44 inside the push tube 41, thus facilitating the recovery of the support rod 48 into the push tube 41 for reuse. When testing a specimen with a larger size, if the length of the push tube 41 is not enough at this time, the support rod 48 can be pushed out of the push tube 41 to increase the overall length of the push tube 41, thus facilitating the increase in the distance between the upper pressure plate 33 and the lower pressure plate 31, and facilitating the stable clamping of the specimen with a larger size.

[0039] In this embodiment, the plug-in limit mechanism 5 includes a square plug 51. A square socket 22 is provided at the center of the bottom tray 21, and the square plug 51 is inserted into the square socket 22. The square plug 51 is fixed on the lower surface of the lower pressure plate 31. At least two support long rods 52 are fixed on the outer circumferential surface of the bottom tray 21, and the through holes opened at the outer ends of the support long rods 52 are sleeved on the outer wall of the downward-extending guide sleeve 42, and the upper surface of the support long rods 52 contacts the lower pressure plate 31. Specifically, when the lower pressure plate 31 fits onto the bottom tray 21, at this time, the square plug 51 will be inserted into the square socket 22, and at the same time, the guide sleeve 42 will be inserted into the through holes of the support long rods 52 extending on both sides, enabling the support long rods 52 to provide gravity support for the lower pressure plate 31, thus facilitating the bottom tray 21 to stably and safely support the specimen fixture 3.

[0040] In this embodiment, the plug-in limiting mechanism 5 further includes a horizontal plug 53. A sliding guide groove 521 is formed inside the supporting long rod 52 and the bottom tray 21, and the sliding guide groove 521 communicates with the square jack 22. At least two limiting jacks 511 are formed on the square plug 51. The horizontal plug 53 is slidably inserted into the sliding guide groove 521, and the end of the horizontal plug 53 close to the square jack 22 is inserted and matched with the limiting jack 511. The other end of the horizontal plug 53 is connected to the groove wall of the sliding guide groove 521 through the cooperation of a sealing block 54 and a spring member 44. An air guide valve 55 communicates with the bottom of the sliding guide groove 521 away from the square jack 22. The bottom of the valve port of the air guide valve 55 is detachably connected to an air guide hose 56. A notch hole 411 is formed in the side wall of the bottom of the push tube 41. A strip-shaped notch 481 is vertically formed on the support rod 48 at the bottom of the push tube 41. The other end of the air guide hose 56 passes through the notch hole 411 and the strip-shaped notch 481 and communicates with the bladder tube 49. Specifically, when the square plug 51 is completely inserted into the square jack 22, at this time, the limiting jack 511 will be aligned with the sliding guide groove 521. Then, gas is slowly injected into the bladder tube 49 through the air guide tube 491 first. At this time, the gas will be injected into the sliding guide groove 521 through the air guide hose 56 and the connected air guide valve 55. As the gas continuously enters the sliding guide groove 521, it will push the horizontal plug 53 to slide in the sliding guide groove 521 towards the limiting jack 511, so that the outer end of the horizontal plug 53 is inserted into the limiting jack 511 and the rest is still located in the sliding guide groove 521. Then, the air guide valve 55 is closed, and the gas injection into the bladder tube 49 is stopped. Furthermore, the inserted horizontal plug 53 will play a role in limiting the square plug 51 in the vertical direction, preventing the lower pressing plate 31 from detaching from the bottom tray 21. And because the air guide valve 55 is in a closed state, therefore, it will not affect the normal inflation of the bladder tube 49 in the push tube 41, enabling the support rod 48 to extend out of the push tube 41. When the support rod 48 extends out of the push tube 41 for support, at this time, the air guide hose 56 connected to the air guide valve 55 will slide upward along the strip-shaped notch 481 formed on the side wall of the tubular support rod 48, preventing the air guide hose 56 from being overstretched when the support rod 48 extends out, which affects its normal air guiding and service life. And when it is necessary to remove the lower pressing plate 31 from the bottom tray 21, at this time, the air guide valve 55 is opened, so that the gas in the sliding guide groove 521 is discharged through the air guide hose 56. Under the elastic reset pull of the spring member 44, the sealing block 54 will drive the horizontal plug 53 to disengage from the limiting jack 511, so that the horizontal plug 53 disengages from the vertical direction limit of the square plug 51, thereby facilitating the removal of the lower pressing plate 31 from the bottom tray 21. When the lower pressing plate 31 moves upward and disassembles and detaches from the bottom tray 21, at this time, the air guide hose 56 will be retracted into the tubular support rod 48, and its connector will be hidden at the bottom of the support rod 48, enabling the push tube 41 to be normally disassembled and detached from the through hole of the support long rod 52.

[0041] In this embodiment, multiple guide rods 32 are located at the four corners of the lower pressing plate 31, and the top end of each guide rod 32 slidably passes through a guide sleeve 42 installed on the upper pressing plate 33 and is connected with a nut member 35. Specifically, by disassembling the nut member 35 from the top of the guide rod 32, the upper pressing plate 33 can be detached from the multiple guide rods 32, which is convenient for repairing and cleaning the specimen fixture 3 that has been used for a long time.

[0042] In the description of this specification, the description with reference to terms such as "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0043] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and utilize the present invention well. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A road asphalt concrete strength testing device, characterized in that: It includes a base body, on which a detection mechanism is arranged, wherein the detection mechanism includes a bottom tray, and the bottom tray is mounted on the upper surface of the base body through a No. 1 electric push rod; A sample fixture is installed on the bottom tray, and the sample fixture includes a lower pressing plate; The lower pressing plate is connected to the bottom tray through a plug-in limiting mechanism, and the upper pressing plate is suspended and supported by a plurality of guide rods on the upper surface of the lower pressing plate, and pads are detachably installed on the corresponding surfaces of the upper pressing plate and the lower pressing plate; The lower pressing plate is provided with two sets of pushing and expanding mechanisms, which are used to push and separate the upper pressing plate from the lower pressing plate; The push-pull expansion mechanism includes a push-pull tube, the upper surface of the lower pressure plate is symmetrically provided with through countersunk holes, and the bottom hole of the countersunk hole is installed with a guide sleeve, and the push-pull tube is slidably inserted in the guide sleeve, and the top of the push-pull tube is fixed with a limit ring, and the bottom of the push-pull tube slides through the guide sleeve and contacts the upper surface of the base body, and a spring member is sleeved on the push-pull tube, and the upper end of the spring member is connected to the limit ring, and the lower end of the spring member is connected to the countersunk hole; The plug-in limit mechanism includes a square plug-in block, a square plug-in hole is provided at the center of the bottom tray, and a square plug-in block is plugged into the square plug-in hole, the square plug-in block is fixedly arranged on the lower surface of the lower pressure plate, at least two supporting long rods are fixedly arranged on the outer ring surface of the bottom tray, and the through holes provided on the outer ends of the supporting long rods are sleeved on the outer wall of the guide sleeve extending downward, and the upper surface of the supporting long rods is in contact with the lower pressure plate; The plug-in limit mechanism also includes a horizontal insertion strip, a sliding guide groove is provided inside the supporting long rod and the bottom plate tray, and the sliding guide groove is connected with the square socket, at least two limit sockets are provided on the square plug block, a horizontal insertion strip is slidably inserted in the sliding guide groove, and the end of the horizontal insertion strip close to the square socket is plugged and matched with the limit socket, and the other end of the horizontal insertion strip is connected with the groove wall of the sliding guide groove through the cooperation of a sealing block and a spring member, the groove bottom of the sliding guide groove away from the square socket is connected with an air guide valve, the bottom of the valve port of the air guide valve is detachably connected with an air guide hose, a notch hole is provided on the bottom side wall of the tube of the push tube, a strip notch is vertically provided on the support rod located at the bottom of the push tube, and the other end of the air guide hose is connected with the sac-type tube through the notch hole and the strip notch.

2. A road asphalt concrete strength testing device according to claim 1, characterized in that: The detection mechanism also includes vertical brackets, which are symmetrically fixed on the base body. A crossbeam frame is fixed on the top of the two vertical brackets, and a No. 2 electric push rod is fixed on the crossbeam frame. The output rod end of the No. 2 electric push rod is detachably insulated and has a connecting piece, and a sensor is installed on the connecting piece.

3. A road asphalt concrete strength testing device according to claim 1, characterized in that: The pushing and expanding mechanism also includes a hose sleeve, and the outer walls of multiple guide rods and pushing tubes are all sleeved with the hose sleeve, and the bottom of the hose sleeve is connected to the upper surface of the lower pressure plate, and two adjacent hose sleeves are connected by an elastic protective layer, and the upper pipe mouth of the hose sleeve located outside the pushing tube is connected to the limit ring, and a notch is formed on the elastic protective layer located on the back of the upper pressure plate and the lower pressure plate, and a baffle is detachably installed on the notch.

4. A road asphalt concrete strength testing device according to claim 3, characterized in that: The pushing and expanding mechanism also includes a support rod, a support rod is inserted upward from the bottom of the pushing tube, and the top of the support rod is connected to the top of the pushing tube through a spring member, a bag-type tube is arranged in the pushing tube, and the upper and lower tube openings of the bag-type tube are respectively connected to the support rod and the top of the pushing tube, and the bag-type tube is located in the spring member, the upper tube opening of the bag-type tube is connected to the air guide tube, and the upper tube opening of the air guide tube extends out of the top of the upper pressure plate.

5. A road asphalt concrete strength testing device according to claim 1, characterized in that: A plurality of guide rods are located at four corners of the lower pressing plate, and a top end portion of each guide rod slides through a guide sleeve installed on the upper pressing plate and is connected with a nut member.

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