Road asphalt concrete strength detection equipment

Abstract

The invention belongs to the technical field of asphalt concrete detection, and particularly relates to road asphalt concrete strength detection equipment which comprises a base body, a detection mechanism is arranged on the base body, the detection mechanism comprises a bottom tray, and the bottom tray is installed on the upper surface of the base body in a suspended mode through an electric push rod; a sample clamp is mounted on the bottom tray and comprises a lower pressing plate; the lower pressing plate is connected with the bottom tray through an insertion limiting mechanism, an upper pressing plate is supported on the upper surface of the lower pressing plate in a suspended mode through a plurality of guide rods, and filler strips are detachably installed on the corresponding surfaces of the upper pressing plate and the lower pressing plate. Two groups of pushing and expanding mechanisms are arranged on the lower pressing plate; the pushing and expanding mechanisms are used for pushing and separating the upper pressing plate from the lower pressing plate; according to the asphalt concrete strength detection equipment, the opening safety of the sample clamp can be improved, meanwhile, samples with different diameter sizes can be stably clamped, and therefore the stability and safety of the asphalt concrete strength detection equipment on asphalt concrete strength detection can be conveniently improved.

Description

Technical Field

[0001] The invention belongs to the technical field of asphalt concrete detection, and in particular 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 graded composition and a certain proportion of road asphalt materials under strictly controlled conditions. Asphalt concrete can be divided into two categories: petroleum asphalt and coal asphalt according to the different binders used. Asphalt concrete needs to be tested before use.

[0003] Most of the existing equipment or instruments for testing the strength of asphalt concrete use splitting test instruments to perform strength testing on asphalt concrete after sampling; the detection unit and the clamp unit of the existing splitting test instruments are separately arranged, and the clamp unit clamps the sample by mostly manually opening it. Obviously, this prevention not only easily leads to safety hazards when the asphalt concrete sample is subjected to strength testing, but also affects the clamp unit's ability to quickly and stably clamp samples of different sizes, thereby affecting the stability and safety of the testing equipment in testing the strength of asphalt concrete. Summary of the invention

[0004] In order to solve the above technical problems, the present invention is achieved through the following technical solutions: The present invention discloses a road asphalt concrete strength testing device, comprising a base body, on which a testing mechanism is arranged, the testing mechanism comprises a bottom tray, and the bottom tray is suspended and mounted on the upper surface of the base body through an electric push rod; a sample fixture is installed on the bottom tray, and the sample fixture comprises a lower pressure plate; the lower pressure plate is connected to the bottom tray through a plug-in limiting mechanism, and an upper pressure plate is suspended and supported on the upper surface of the lower pressure plate through a plurality of guide rods, and pads are detachably installed on the corresponding surfaces of the upper pressure plate and the lower pressure plate; two sets of pushing and expanding mechanisms are arranged on the lower pressure plate, and the pushing and expanding mechanisms are used to push and separate the upper pressure plate from the lower pressure plate.

[0005] Furthermore, the detection mechanism also includes support rods, which are symmetrically fixed on the base body, and a crossbeam frame is fixed on the top of the two support rods, and an electric push rod is also fixed on the crossbeam frame, and the output rod end of the electric push rod is detachably insulated with a connecting piece, and a sensor is installed on the connecting piece.

[0006] Furthermore, the pushing and expanding support mechanism includes a pushing tube, the upper surface of the lower pressure plate is symmetrically provided with penetrating countersunk holes, and the bottom hole of the countersunk hole is installed with a guide sleeve, and the pushing tube is slidably inserted in the guide sleeve, and a limiting ring is fixed on the top of the pushing tube, and its bottom slides through the guide sleeve and contacts with the upper surface of the base body, a spring part is sleeved on the pushing tube, and the upper end of the spring part is connected to the limiting ring, and the lower end of the spring part is connected to the countersunk hole.

[0007] Furthermore, the pushing and expanding support mechanism also includes a hose cover, and the outer walls of multiple guide rods and pushing tubes are all sleeved with the hose covers, and the bottom of the hose covers is connected to the upper surface of the lower pressure plate, and two adjacent hose covers are connected by an elastic protective layer, and the upper pipe mouth of the hose cover 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.

[0008] Furthermore, 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.

[0009] Furthermore, the plug-in limit mechanism includes a square plug block, a square plug hole is opened at the center of the bottom tray, and a square plug block is inserted in the square plug hole, the square plug block is fixed to the lower surface of the lower pressure plate, and at least two supporting long rods are fixed to the outer ring surface of the bottom tray, and the through holes opened at 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.

[0010] Furthermore, 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 to 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 to 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 to an air guide valve, the bottom of the valve port of the air guide valve is detachably connected to 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 to the sac-type tube through the notch hole and the strip notch.

[0011] Furthermore, 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 to a nut member.

[0012] The present invention has the following beneficial effects: 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.

[0013] 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.

[0014] 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

[0015] 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.

[0016] Figure 1 It is a schematic diagram of the overall structure disclosed in the present invention; Figure 2 It is a structural schematic diagram of the sample fixture disclosed in the present invention; Figure 3 It is a schematic diagram of the back side of the sample holder disclosed in the present invention; Figure 4 It is a schematic diagram of the internal structure of the sample fixture disclosed in the present invention; Figure 5It is a schematic diagram of the bottom structure of the sample fixture disclosed in the present invention; Figure 6 It is a partial cross-sectional view of the lower pressing plate of the present invention; Figure 7 It is a partial cross-sectional view of the bottom tray of the present invention.

[0017] In the figure: 1. base body; 2. Detection mechanism; 21. Bottom tray; 22. Square jack; 23. Electric push rod; 24. Vertical bracket; 25. Crossbeam frame; 26. Connector; 27. Detection sensor; 3. Sample fixture; 31. Lower pressing plate; 311. Countersunk hole; 32. Guide rod; 33. Upper pressing plate; 34. Spacer strip; 35. Nut; 4. Pushing and expanding mechanism; 41. Pushing tube; 411. Notch hole; 42. Guide sleeve; 43. Limiting ring; 44. Spring member; 45. Hose sleeve; 46. Elastic protective layer; 47. Elastic baffle; 48. Support rod; 481. Strip notch; 49. Bag tube; 491. Air guide tube; 5. Insertion limit mechanism; 51. Square plug block; 511. Limit plug hole; 52. Support long rod; 521. Sliding guide groove; 53. Horizontal insert strip; 54. Sealing block; 55. Air guide valve; 56. Air guide hose. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "all around" and the like 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 should not be understood as limiting the present invention.

[0020] See also Figure 1-Figure 7As shown, the present invention is a road asphalt concrete strength testing equipment, including a base body 1, on which a testing mechanism 2 is arranged, the testing mechanism 2 includes a bottom tray 21, and the bottom tray 21 is suspended and installed on the upper surface of the base body 1 through an electric push rod 23; a sample fixture 3 is installed on the bottom tray 21, and the sample fixture 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 an upper pressing plate 33 is suspended and supported on the upper surface of the lower pressing plate 31 through a plurality of guide rods 32, and 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 pushing and expanding mechanisms 4 are arranged on the lower pressing plate 31, and the pushing and expanding mechanisms 4 are used to push and separate the upper pressing plate 33 from the lower pressing plate 31;Specifically, when the strength test of the sample is required, the output rod of the electric push rod 23 on the base body 1 is first controlled to extend, so that it drives the bottom tray 21 to rise to the highest position, and then the lower pressing plate 31 of the sample clamp 3 is placed on the bottom tray 21, so that it is fixedly connected with the bottom tray 21 through the plug-in limit 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 pads 34. When the bottom tray 21 moves downward, the push-pull expansion mechanism 4 will drive the upper pressing plate 33 to move upward and open relative to the lower pressing plate 31, and the multiple guide rods 3 2 can play a role in guiding the sliding of the upper pressing plate 33, and the inspector can control the downward movement distance of the bottom tray 21 according to the diameter of the sample to be split tested, so as to facilitate the control of the distance between the upper pressing plate 33 and the lower pressing plate 31 after separation, and then put the sample to be tested between the two pads 34 separated from each other, and then control the bottom tray 21 to move upward as needed, so that the pushing and expanding mechanism 4 is separated from the pushing of the upper pressing plate 33, so that the pads 34 on the upper pressing plate 33 are in contact with the sample, and then as the bottom tray 21 continues to rise under the push of the electric push rod 23, the upper pressing plate 33 is pushed upward. The sample fixture 3 is brought into contact with the testing mechanism 2, thereby facilitating the splitting strength test of the clamped sample, thereby enabling accurate and rapid testing of the strength of the asphalt concrete. When the sample test is completed, the lowering of the bottom tray 21 causes the upper pressing plate 33 to move upward relatively, thereby facilitating the sample fixture 3 to automatically open and disengage from the tested sample, and then take out the tested sample, and detachably fix the sample fixture 3 on the bottom tray 21 through the plug-in limiting mechanism 5, which can prevent the push-pushing expansion mechanism 4 from moving downward on the bottom tray 21, and when the upper pressing plate 33 is separated from the lower pressing plate 31, the sample The phenomenon that the clamp 3 separates and falls from the bottom tray 21 will not only affect the stable clamping of the sample clamp 3 on the sample to be tested, but also affect the pushing and separation of the upper pressing plate 33 and the lower pressing plate 31 by the pushing and expanding mechanism 4. Since the upper pressing plate 33 and the lower pressing plate 31 are automatically separated and opened, the operator does not need to manually open the upper pressing plate 33 and the lower pressing plate 31, which can not only improve the safety of opening the sample clamp 3, 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.Preferably, the pads 34 on the upper pressing plate 33 and the lower pressing plate 31 can be removed so that the block-shaped asphalt concrete sample can be stably clamped between the upper pressing plate 33 and the lower pressing plate 31, and at this time, the bottom tray 21 can push the clamp 3 holding the block-shaped sample to rise and contact the detection mechanism 2, and at this time, the push-pushing and expanding mechanism 4 no longer exerts a push force on the upper pressing plate 33, and then the detection mechanism 2 can drive the detection sensor 27 to move downward and contact the upper pressing plate 33. As the detection sensor 27 continuously applies pressure to the upper pressing plate 33, the compressive strength test of the asphalt concrete can be realized, thereby improving the extensiveness of the detection equipment for the strength test of asphalt concrete. ;

[0021] In this embodiment, the detection mechanism 2 also includes a vertical bracket 24, and the symmetrical vertical brackets 24 are fixed on the base body 1. A crossbeam frame 25 is fixed on the top of the two vertical brackets 24, and an electric push rod 23 is also fixed on the crossbeam frame 25. The output rod end of the electric push rod 23 is detachably insulated with a connector 26, and a detection sensor 27 is installed on the connector 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 will not interfere with the rising of the sample after being clamped by the sample fixture 3 and the contact with the detection sensor 27, and the electric push rod 23 on the crossbeam 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 to install the sample fixture 3, and it is also convenient to quickly perform splitting strength detection on the sample after being clamped by the sample fixture 3; and the detection sensor 27 is preferably a pressure sensor or a displacement sensor or other sensor that can perform strength detection.

[0022] 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.

[0023] In this embodiment, the push-pull expansion mechanism 4 also includes a hose sleeve 45, and the outer walls of the plurality of guide rods 32 and the push-pull 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, and two adjacent hose sleeves 45 are connected by an elastic protective layer 46, and the upper tube mouth of the hose sleeve 45 located outside the push-pull tube 41 is connected to the limit ring 43, and a notch is formed on the elastic protective layer 46 located on the back of the upper pressing plate 33 and the lower pressing plate 31, and an elastic baffle 47 is detachably installed on the notch; Specifically, when the push tube 41 slides upward relatively in the guide sleeve 42 of the lower pressure plate 31, the limit ring 43 will drive the compressed hose sleeve 45 to stretch upward, and the guide rod 32 and the hose sleeve 45 outside the push 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 that is elastically surrounded by a square to stretch, so as to block the splashing residues generated by the sample being split or compressed, and prevent the splashing residues from causing safety hazards to the inspectors; and when the upper pressure plate 33 After being separated from the lower pressure plate 31 and the elastic protective layer 46, the sample to be tested is placed between the upper and lower pads 34 through the notch opened on the back of the elastic protective layer 46 that forms a square, and then the elastic baffle 47 is installed in the notch to achieve alignment and sealing. When the sample splitting or compressive strength test is completed, the upper pressure plate 33 and the lower pressure plate 31 are opened to the maximum distance, and then the elastic baffle 47 is removed from the notch, so as to facilitate the removal and cleaning of the tested sample from between the upper pressure plate 33 and the lower pressure plate 31.

[0024] In this embodiment, the push-expanding mechanism 4 also includes a support rod 48, the bottom of the push tube 41 is upwardly inserted with the support rod 48, and the top of the support rod 48 is connected to the top of the push tube 41 through the spring member 44, a sac-type tube 49 is arranged in the push tube 41, and the upper and lower tube openings of the sac-type tube 49 are respectively connected to the support rod 48 and the top of the push tube 41, and the sac-type tube 49 is located in the spring member 44, and the upper tube opening of the sac-type tube 49 is connected to the air guide tube 491, and the upper tube opening of the air guide tube 491 extends out of the top of the upper pressure plate 33; Specifically, in order to prevent the bottom tray 21 from being too high in height, causing the push tube 41 to slide down too low under the elastic pull of the spring member 44, resulting in the elastic protective layer 46 being lower than the position below the middle of the clamped sample, thereby affecting the elastic protective layer 46 from blocking the fragments generated by the sample being split or compressed. Therefore, a support rod 48 is provided inside the bottom of the push tube 41. When the bottom tray 21 drives the clamped sample to move upward, the push tube 41 will move downward by one end, so that the limit ring 43 is lower than the lower surface of the pad 34 on the lower surface of the upper pressure plate 33, and then the air pump connected to the air guide tube 491 is controlled to work, so that the gas will enter the sac-type tube 49 through the air guide tube 491, and the sac-type tube 49 will expand in 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, so that the support rod 48 sliding downward is aligned with the upper surface of the base body 1. The upper and lower plates 33 are in contact with each other, so that the upper and lower plates 33 are in contact with each other, and the upper and lower plates 33 are in contact with each other, so that the upper and lower plates 33 are in contact with each other, so that the upper and lower plates 33 are in contact with each other, so that the upper and lower plates 33 are in contact with each other, so that the upper and lower plates 33 are in contact with each other, so that the upper and lower plates 33 are in contact with each other, so that the upper and lower plates 33 are in contact with each other, so that the upper and lower plates 33 are in contact with each other, so that the upper and lower plates 33 are in contact with each other, so that the upper and lower plates 33 are in contact with each other, and ...

[0025] In this embodiment, the plug-in limit mechanism 5 includes a square plug block 51, a square plug hole 22 is opened at the center of the bottom tray 21, and the square plug block 51 is inserted in the square plug hole 22, the square plug block 51 is fixedly arranged on the lower surface of the lower pressure plate 31, and at least two supporting long rods 52 are fixedly arranged on the outer ring surface of the bottom tray 21, and the through holes opened at the outer ends of the supporting long rods 52 are sleeved on the outer wall of the guide sleeve 42 extending downward, and the upper surfaces of the supporting long rods 52 are in contact with the lower pressure plate 31; specifically, when the lower pressure plate 31 is attached to the bottom tray 21, the square plug block 51 will be inserted into the square plug hole 22, and the guide sleeve 42 will be inserted into the through holes of the supporting long rods 52 extending on both sides, so that the supporting long rods 52 can support the lower pressure plate 31 by gravity, so that the bottom tray 21 can stably and safely support the sample clamp 3.

[0026] In this embodiment, the plug-in limiting mechanism 5 also includes a horizontal inserting strip 53, a sliding guide groove 521 is provided inside the supporting long rod 52 and the bottom tray 21, and the sliding guide groove 521 is connected to the square plug hole 22, and at least two limiting plug holes 511 are provided on the square plug block 51, and the horizontal inserting strip 53 is slidably inserted in the sliding guide groove 521, and the end of the horizontal inserting strip 53 close to the square plug hole 22 is plugged and matched with the limiting plug hole 511, and the other end of the horizontal inserting strip 53 is connected to the groove wall of the sliding guide groove 521 through the cooperation of the sealing block 54 and the spring member 44, and the bottom of the sliding guide groove 521 away from the square plug hole 22 is connected to the air guide valve 55, and the bottom of the valve port of the air guide valve 55 is detachably connected to the air guide hose 56, and the bottom side wall of the tube bottom of the push tube 41 is provided with The notch hole 411 is vertically provided with a strip notch 481 on the support rod 48 at the bottom of the push tube 41, and the other end of the air guide hose 56 passes through the notch hole 411 and the strip notch 481 to communicate with the sac tube 49; specifically, when the square plug 51 is fully inserted into the square plug hole 22, the limit plug hole 511 will be aligned with the sliding guide groove 521, and then the gas will be slowly injected into the sac tube 49 through the air guide tube 491. At this time, the gas will first be injected into the sliding guide groove 521 through the air guide hose 56 and the connected air guide valve 55, and as the gas continues to enter the sliding guide groove 521, it will push the horizontal insert 53 to slide in the sliding guide groove 521 toward the limit plug hole 511, so that the outer end of the horizontal insert 53 is inserted into the limit plug hole 51 1 and the rest of the part is still in the sliding guide groove 521, then the air guide valve 55 is closed, and the injection of gas into the bladder tube 49 is stopped, and the inserted horizontal insert 53 will play a role of limiting the vertical direction of the square insert block 51, preventing the lower pressure plate 31 from being separated from the bottom tray 21; and because the air guide valve 55 is in a closed state, it will not affect the normal expansion of the bladder tube 49 in the push tube 41, so that the support rod 48 extends out of the push tube 41, and when the support rod 48 extends out of the push tube 41 for support, the air guide hose 56 connected to the air guide valve 55 will slide upward along the strip notch 481 opened on the side wall of the tubular support rod 48, preventing the air guide hose 56 from being stretched too long when the support rod 48 extends. This affects its normal gas connection and service life; when it is necessary to remove the lower pressure plate 31 from the bottom tray 21, the gas valve 55 is opened at this time to discharge the gas in the sliding guide groove 521 through the gas hose 56, and the sealing block 54, under the elastic reset pull of the spring member 44, will drive the horizontal insertion strip 53 to disengage from the limiting plug hole 511, so that the horizontal insertion strip 53 is separated from the vertical limit of the square plug block 51, thereby facilitating the removal of the lower pressure plate 31 from the bottom tray 21, and when the lower pressure plate 31 moves upward and is disassembled from the bottom tray 21, the gas hose 56 will be recovered into the tubular support rod 48, and its connecting head will be hidden at the bottom of the support rod 48, so that the push tube 41 can be normally disassembled and disassembled from the through hole of the support long rod 52.

[0027] In this embodiment, multiple guide rods 32 are located at the four corners of the lower pressure plate 31, and the top end of each guide rod 32 slides through the guide sleeve 42 installed on the upper pressure plate 33 and is connected to a nut member 35; specifically, by disassembling the nut member 35 from the top of the guide rod 32, the upper pressure plate 33 can be disassembled and separated from the multiple guide rods 32, which is convenient for maintenance and cleaning of the sample fixture 3 that has been used for a long time.

[0028] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction 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 any one or more embodiments or examples in a suitable manner.

[0029] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only 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 suspended and mounted on the upper surface of the base body through an 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; Two groups of pushing and expanding mechanisms are arranged on the lower pressing plate, and the pushing and expanding mechanisms are used for pushing and separating the upper pressing plate from the lower pressing plate.

2. A road asphalt concrete strength testing device according to claim 1, characterized in that: The detection mechanism also includes support rods, which are symmetrically fixed on the base body. A crossbeam frame is fixed on the top of the two support rods, and an electric push rod is also fixed on the crossbeam frame. The output rod end of the 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 support mechanism includes a pushing 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 pushing tube is slidably inserted in the guide sleeve, and a limiting ring is fixed on the top of the pushing tube, and its bottom slides through the guide sleeve and contacts with the upper surface of the base body, a spring part is sleeved on the pushing tube, and the upper end of the spring part is connected to the limiting ring, and the lower end of the spring part is connected to the countersunk hole.

4. A road asphalt concrete strength testing device according to claim 3, 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.

5. A road asphalt concrete strength testing device according to claim 4, 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.

6. A road asphalt concrete strength testing device according to claim 3, characterized in that: The plug-in limit mechanism includes a square plug block, a square plug hole is opened at the center of the bottom tray, and a square plug block is inserted in the square plug hole, the square plug block is fixed to the lower surface of the lower pressure plate, and at least two supporting long rods are fixed to the outer ring surface of the bottom tray, and the through holes opened at 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.

7. A road asphalt concrete strength testing device according to claim 6, characterized in that: 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.

8. 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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