A hardness testing device for machine-made sand concrete

Abstract

The present invention belongs to the technical field of concrete testing, and relates to a hardness testing device for machine-made sand concrete, comprising: an electric guide rail is installed on the pressure platform of the testing machine, and the slider of the electric guide rail is provided with a support plate; a mounting seat 1 is connected to the pressure platform of the testing machine, and a vertical support column 1 is provided on the mounting seat 1, a measuring ruler is connected to one side of the support column 1, a measuring mark 1 is connected to the lower part of the support column 1, and a measuring mark 2 whose length is smaller than the measuring mark 1 slides on the upper part of the support column 1; a protractor is rotated on the measuring mark 2, and a rotating mark rotates at the center of the protractor. The electric guide rail drives the support plate to drive the concrete specimen to move up, so as to assist in carrying the concrete specimen for hardness testing, and the operator does not need to carry it manually in tedious manner during multiple tests; and the size and angle of the concrete specimen can be measured conveniently on the support plate in a suitable standing posture using the measuring marks 1 and 2, the protractor and the rotating mark.

Description

Technical Field

[0001] The invention belongs to the technical field of concrete testing, and in particular relates to a hardness testing device for machine-made sand concrete. Background Art

[0002] Machine-made sand concrete is concrete made using artificial sand obtained from rocks through mechanical crushing and screening processes as fine aggregate. This type of concrete can adjust its properties according to engineering needs and help reduce dependence on natural river sand resources.

[0003] The purpose of hardness testing on manufactured sand concrete is to evaluate its durability and structural strength. Hardness is an important indicator of a material's ability to resist external forces such as indentation or scratching. For concrete, this is directly related to its performance in practical applications, such as whether it can withstand sufficient load without damage and whether it can resist wear and tear.

[0004] At present, the common concrete pressure testing machine is based on the national standard GB / T50081-2019 "Concrete Physical and Mechanical Properties Test Method Standard" to measure and judge the performance parameters of concrete. The standard size of the concrete specimen in the test is 15cm×15cm×15cm, which is widely used in compressive strength tests and meets international standards.

[0005] At present, when testing the hardness of concrete specimens, it is necessary to manually carry the concrete specimens upwards to the pressure testing machine, which is cumbersome and unsafe. If the concrete accidentally falls off the hands during the carrying process, it will not only cause the concrete to fall and be damaged, but also easily injure the operator. In addition, the size measurement of the concrete specimen before the hardness test requires the operator to bend down and squat on the ground to measure or carry the concrete specimen to other workbenches for measurement, which is inconvenient. Summary of the invention

[0006] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and to provide a hardness testing device for machine-made sand concrete, which can automatically transfer concrete specimens upward, has high safety, and allows the operator to conveniently measure the size of the concrete specimens in a suitable standing posture.

[0007] In order to solve the above technical problems, the present invention provides a hardness testing device for machine-made sand concrete, including a pressure testing machine body, the pressure testing machine body including a testing machine pressure platform, a testing machine control console arranged on the upper part of the testing machine pressure platform, a testing machine lower pressure piece and a testing machine protective cover, two left and right opposite electric guide rails are installed on the testing machine pressure platform, and a support plate for supporting a concrete specimen is arranged between the sliders of the two electric guide rails; a mounting seat is connected to the upper right front side of the testing machine pressure platform, a vertical support column is arranged on the mounting seat, and a distance gauge for measuring the size of the concrete specimen is connected to one side of the support column A ruler, a measuring mark 1 is connected to the lower part of the supporting column 1, a measuring mark 2 whose length is greater than the measuring mark 1 is slidably arranged on the upper part of the supporting column 1, an opening for the measuring mark 1 to pass through is opened on the supporting plate, the right ends of the measuring marks 1 and 2 are both connected with pointers indicating the scales on the measuring ruler, and the pointer on the measuring mark 1 indicates the digital zero scale on the measuring ruler; a protractor is rotatably arranged on the upper side of the measuring mark 2, the lower side surface of the protractor is flush with the lower side of the measuring mark 2, a rotating mark is rotatably arranged at the center of the protractor, and the upper end of the rotating mark has a pointer line indicating the scales on the protractor, and when the rotating mark is perpendicular to the measuring mark 2, the pointer on the rotating mark indicates to the 90-degree scale line of the protractor.

[0008] Preferably, it also includes a compression spring 1, a support column 1 is slidably arranged on a mounting seat 1, a compression spring 1 is connected between the support column 1 and the mounting seat 1, the compression spring 1 is used for resetting the downwardly moved support column 1, and a tension spring located inside the support column 1 is connected between the measuring scale 2 and the support column 1.

[0009] Preferably, it also includes a torsion spring 1 connected between the rotating mark and the protractor, and the torsion spring 1 keeps the angle between the left side of the rotating mark and the lower side of the protractor less than ninety degrees.

[0010] Preferably, it also includes a mounting seat 2 connected to the upper left front side of the pressure platform of the testing machine, the mounting seat 2 is provided with a support seat, the support seat is provided with a support column 2, a support rod is rotatably provided on the support column 2, a knife edge ruler is connected to the right end of the support rod, a T-shaped guide frame is slid on the support rod, a sliding shaft parallel to the support rod is slid on the guide frame, the sliding direction of the sliding shaft on the guide frame is perpendicular to the sliding direction of the guide frame on the support rod, and an elastic feeler gauge perpendicular to the knife edge ruler is provided on the right end of the sliding shaft.

[0011] Preferably, it also includes a motor installed on the second support column, the output shaft of the motor is connected to the support rod, the second support column is connected to a connecting frame which is annular in shape and concentric with the support rod, the connecting frame is connected to a wedge-shaped disk suitable for extruding the guide frame, two connecting springs located in the guide frame are connected between the guide frame and the support rod, the connecting springs are used to reset the guide frame moving along the support rod, a circle of arc blocks suitable for extruding the sliding shaft is connected to the connecting frame, and two compression springs located in the guide frame are connected between the sliding shaft and the guide frame, the compression springs are used to reset the sliding shaft moving along the guide frame.

[0012] Preferably, it also includes an electric screw rod 1 installed on the mounting seat 2, the support seat is slidably arranged on the mounting seat 2, and the threaded shaft of the electric screw rod 1 is threadedly connected with the support seat.

[0013] Preferably, it also includes an electric screw rod 2 installed on the support seat, and the support column 2 is slidably arranged on the support seat, and the threaded shaft of the electric screw rod 2 is threadedly connected with the support column 2.

[0014] Preferably, it also includes a second torsion spring, the elastic feeler gauge is rotatably arranged at the right end of the sliding shaft, the second torsion spring is connected between the elastic feeler gauge and the sliding shaft, the measuring end of the elastic feeler gauge is close to and inclined toward the knife-edge gauge, and there is a predetermined angle between the measuring end of the elastic feeler gauge and the horizontal extension line of the measuring surface of the knife-edge gauge.

[0015] Preferably, a receiving groove suitable for receiving the support plate is provided at the lower part of the pressure bearing platform of the testing machine, and the support plate is slidably arranged on the slider of the electric guide rail.

[0016] Preferably, it also includes a door panel slidably arranged on one side of the testing machine protective cover, the door panel is close to the support plate, and two compression springs three opposite to each other are connected between the door panel and the testing machine protective cover, and the compression spring three is used for resetting the opened door panel; one side of the door panel is connected to an inclined rod with its left end inclined toward the upper left, and a resistance rod suitable for squeezing the inclined rod is connected to the slider of one of the two electric guide rails.

[0017] The present invention overcomes the shortcomings of the prior art and can achieve the following beneficial effects:

[0018] 1. The electric guide rail drives the support plate to move the concrete specimen upward to assist in carrying the concrete specimen for hardness testing, eliminating the need for tedious manual carrying during multiple tests by the operator; and the size and angle of the concrete specimen can be measured conveniently on the support plate in a suitable standing posture using measuring scales 1 and 2, a protractor and a rotating scale.

[0019] 2. On the basis of measuring the size with measuring mark 1 and measuring mark 2, and measuring the angle with protractor and rotating mark, use elastic feeler gauge close to knife edge gauge to measure whether the surface flatness of concrete on the support plate meets the requirements of hardness test. It is convenient to do without tediously taking and replacing multiple different tools. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is an assembly schematic diagram of the present invention.

[0021] Figure 2 This is the front view of the present invention, in which the protective cover of the testing machine is fully cut away.

[0022] Figure 3 It is a schematic diagram of a mounting base 1, a supporting column 1 and a measuring ruler of the present invention, wherein only a part of the mounting base 1 is shown schematically.

[0023] Figure 4 It is a cross-sectional view of a support column 1 of the present invention.

[0024] Figure 5 It is a schematic diagram of the protractor, the rotating mark and the torsion spring 1 of the present invention.

[0025] Figure 6 It is a schematic diagram of the second mounting base, the support base and the second support column of the present invention.

[0026] Figure 7 This is a front view of the second mounting seat, the support seat and the second support column of the present invention, wherein the second mounting seat and the support seat are fully cut away.

[0027] Figure 8 It is a schematic diagram of the connection frame, wedge-shaped disk and arc block of the present invention.

[0028] Fig. 9 The present invention is based on Figure 8 Schematic diagram of usage status.

[0029] Fig.10 It is a top view of the knife edge ruler, sliding shaft and elastic feeler gauge of the present invention, wherein the sliding shaft is a full section.

[0030] Fig.11 It is a cross-sectional view of the pressure platform of the testing machine of the present invention.

[0031] Fig.12 It is a schematic diagram of the state when the support plate of the present invention moves up to the threshold and the door panel is opened.

[0032] Fig.13 It is a schematic diagram of the rear side of the protective cover, door panel and compression spring of the testing machine of the present invention.

[0033] The marks in the accompanying drawings provided by the present invention are: 11-testing machine pressure platform, 110-accommodating groove, 12-testing machine control console, 13-testing machine lower pressure piece, 14-testing machine protective cover, 21-electric guide rail, 22-slider, 23-support plate, 31-mounting seat 1, 32-support column 1, 33-measuring ruler, 34-measuring mark 1, 35-measuring mark 2, 36-pointer, 37-compression spring 1, 38-tension spring, 41-protractor, 42-rotation mark, 43-torsion Force spring one, 51-mounting seat two, 52-support seat, 53-support column two, 54-support rod, 55-knife edge ruler, 56-guide frame, 57-sliding shaft, 58-elastic feeler gauge, 59-torsion spring two, 61-motor, 62-connecting frame, 63-wedge disk, 64-connecting spring, 65-arc block, 66-compression spring two, 71-electric screw one, 72-electric screw two, 81-door panel, 82-oblique rod, 83-resistance rod, 84-compression spring three. DETAILED DESCRIPTION

[0034] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0035] In addition, the terms "first", "second" and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. It should be noted that the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0036] A hardness testing device for machine-made sand concrete, such as Figure 1-Figure 5As shown, the pressure testing machine body includes a pressure testing machine body, which includes a pressure testing machine platform 11, a testing machine control console 12 arranged on the upper part of the pressure testing machine platform 11, a testing machine lower pressure piece 13 and a testing machine protective cover 14. The concrete specimen is placed on the upper side of the pressure testing machine platform 11 and directly below the testing machine lower pressure piece 13. The testing machine control console 12 is controlled according to the age and size of the concrete specimen to drive the testing machine lower pressure piece 13 to move downward to uniformly and continuously apply load and pressure to the concrete specimen with a length, width and height of 15 cm, so as to perform a hardness test. Finally, the compressive strength of the machine-made sand concrete specimen is obtained by dividing the concrete specimen breaking load (N) by the specimen pressure bearing area (mm2). Two left and right opposite electric guide rails 21 are installed on the pressure testing machine platform 11, and a slider 22 of the two electric guide rails 21 is provided between them. There is a support plate 23 for supporting the concrete specimen. The electric guide rail 21 is controlled to drive the slider 22 thereon to drive the concrete specimen to move up through the support plate 23 until the slider 22 of the electric guide rail 21 moves up to the threshold. At this time, the upper side of the support plate 23 is flush with the upper side of the test machine pressure platform 11. Then the concrete specimen can be easily transferred from the support plate 23 to the upper side of the test machine pressure platform 11, which is located directly below the test machine lower pressure piece 13, thereby assisting the operator in carrying the concrete specimen. The operator does not need to manually carry the concrete specimen tediously during multiple tests, and avoids accidental falling and damage of the concrete specimen and injury to the operator. In addition, after the hardness test of the concrete specimen is completed, the concrete on the test machine pressure platform 11 that has completed the hardness test can also be conveniently transferred to the support plate 23 for easy cleaning.

[0037] The upper right front side of the pressure platform 11 of the testing machine is connected with a mounting seat 31, and a vertical support column 32 is provided on the mounting seat 31. A measuring ruler 33 for measuring the size of the concrete specimen is connected to one side of the support column 32. A measuring mark 34 is connected to the lower part of the support column 32. A measuring mark 2 35 with a length greater than the measuring mark 34 is slidably provided on the upper part of the support column 32. An opening for the measuring mark 34 to pass through is opened on the support plate 23. In order to accurately obtain the data of the hardness test of the concrete specimen, it is necessary to To understand whether the length, width and height of the concrete specimen meet the requirements of the hardness test, when the support plate 23 drives the concrete specimen to move upward, the concrete specimen does not directly contact the first scale 34 until the slider 22 of the electric guide rail 21 moves up to the threshold value, and the first scale 34 passes through the opening on the support plate 23. At this time, the upper side of the first scale 34 is flush with the upper side of the support plate 23. Move the concrete specimen to the right to the upper side of the first scale 34, and move the second scale 35 on the support column 1 32 to make the concrete specimen move to the right to the upper side of the first scale 34. The lower side of the second measuring mark 35 is flush with the upper side of the concrete specimen, so that the first measuring mark 34 and the second measuring mark 35 clamp the concrete specimen. The right ends of the first measuring mark 34 and the second measuring mark 35 are connected with pointers 36 indicating the scale on the measuring ruler 33. The pointer 36 on the first measuring mark 34 indicates the digital zero scale on the measuring ruler 33. The upward moving second measuring mark 35 will drive the pointer 36 thereon to move upward synchronously. After the first measuring mark 34 and the second measuring mark 35 clamp the concrete specimen, the number on the measuring ruler 33 indicated by the pointer 36 on the second measuring mark 35 can be used to read whether the size of the concrete specimen meets the requirements. Similarly, if it is necessary to use the measuring ruler 33 to measure the size of other positions of the concrete specimen, the concrete specimen can be turned over on the support plate 23, so that the operator does not need to bend down and squat to measure on the ground or carry the concrete specimen to other workbenches for measurement. On the basis of the support plate 23 assisting in carrying the concrete specimen, the operator can also conveniently measure the size of the concrete specimen in a suitable standing posture.

[0038] A protractor 41 is rotated on the upper side of the second scale 35, and the lower side of the protractor 41 is flush with the lower side of the second scale 35. A rotating mark 42 is rotated at the center of the protractor 41, and the upper end of the rotating mark 42 has a pointer line indicating the scale on the protractor 41. When the rotating mark 42 is perpendicular to the second scale 35, the pointer line on the rotating mark 42 indicates the 90-degree scale line of the protractor 41. When the concrete specimen moves right to the upper side of the first scale 34 and the lower side of the second scale 35 is flush with the upper side of the concrete specimen, the protractor 41 is also rotated to make its lower side fit the upper side of the concrete specimen, and the rotating mark is rotated. 42 makes its left side fit to the right side of the concrete specimen, so that the angle between the upper side surface of the concrete specimen and the right side surface of the concrete specimen can be measured according to the position indicated by the rotating mark 42 on the protractor 41 to see whether it meets the requirements. If it is necessary to measure the angles of other adjacent surfaces of the concrete specimen, just turn the concrete specimen on the support plate 23, so there is no need to tediously take and put a plurality of different tools for use, and the angle of the concrete specimen can be conveniently measured, thereby understanding whether the angles of adjacent surfaces of the concrete specimen meet the requirements of the hardness test, and accurately obtaining the data for testing the hardness of the concrete specimen.

[0039] like Figure 4 As shown, it also includes a compression spring 37. The support column 32 is slidably arranged on the mounting seat 31. A compression spring 37 is connected between the support column 32 and the mounting seat 31. The compression spring 37 is used to reset the support column 32 that moves downward. When the concrete specimen is moved right to the upper side of the measuring mark 34, if the concrete specimen squeezes the measuring mark 34 to drive the support column 32 downward, the compression spring 37 is deformed. In this way, the support column 32 drives the measuring mark 34 to always maintain a state of close contact with the lower side of the concrete specimen upward by utilizing the effect of the compression spring 37. A tension spring 38 located in the support column 32 is connected between the measuring mark 2 35 and the support column 32. In the process of the support plate 23 driving the concrete specimen to move upward, the concrete specimen will squeeze the measuring mark 2 35 to move upward, and the tension spring 38 is deformed. In this way, the tension spring 38 is utilized to make the measuring mark 2 35 always maintain a state of close contact with the upper side of the concrete specimen downward, thereby ensuring the accuracy of the measurement and reducing errors.

[0040] like Figure 5As shown, it also includes a torsion spring 43 connected between the rotating mark 42 and the protractor 41. The torsion spring 43 keeps the angle between the left side of the rotating mark 42 and the lower side of the protractor 41 at less than ninety degrees. Therefore, when the concrete specimen moves up to contact the measuring mark 2 35 and the concrete specimen moves right to contact the measuring mark 1 34, if the angle between the upper side surface and the right side surface of the concrete specimen is equal to or greater than ninety degrees, the concrete specimen will squeeze the rotating mark 42 and the protractor 41, and the angle between the left side of the rotating mark 42 and the lower side of the protractor 41 will increase, and the torsion spring 43 will be deformed. However, under the action of the torsion spring 43, the left side of the rotating mark 42 is always in close contact with the right side of the concrete specimen, and the lower side of the protractor 41 is always in close contact with the upper side of the concrete specimen, so as to quickly measure whether the angle between adjacent surfaces of the concrete specimen meets the requirement of ninety degrees.

[0041] like Figure 1 , Figure 6 , Figure 7 , Figure 8 and Fig. 9 As shown, it also includes a mounting seat 2 51 connected to the upper left front side of the pressure platform 11 of the testing machine, a support seat 52 is provided on the mounting seat 2 51, a support column 2 53 is provided on the support seat 52, a support rod 54 is rotatably provided on the support column 53, a knife edge ruler 55 is connected to the right end of the support rod 54, a guide frame 56 in a T-shape slides on the support rod 54, a sliding shaft 57 parallel to the support rod 54 slides on the guide frame 56, the sliding direction of the sliding shaft 57 on the guide frame 56 is perpendicular to the sliding direction of the guide frame 56 on the support rod 54, and an elastic feeler gauge 58 perpendicular to the knife edge ruler 55 is provided on the right end of the sliding shaft 57. When the support plate 23 drives the concrete specimen to move upward, if it is necessary to measure whether the flatness of the surface of the concrete specimen meets the requirements of the hardness test, the concrete specimen is moved upward. The specimen moves to the left to contact the knife edge ruler 55 and the elastic feeler gauge 58. The support rod 54 is rotated to adjust the positions of the knife edge ruler 55 and the guide frame 56. The guide frame 56 drives the elastic feeler gauge 58 to adjust its position through the sliding shaft 57, so as to adjust the measurement position of the flatness. During measurement, the elastic feeler gauge 58 is driven by the sliding shaft 57 to approach between the knife edge ruler 55 and the concrete specimen. If the elastic feeler gauge 58 passes between the knife edge ruler 55 and the concrete specimen, it indicates that the surface flatness of the concrete specimen does not meet the requirements of the hardness test. If the elastic feeler gauge 58 does not pass between the knife edge ruler 55 and the concrete specimen, the elastic feeler gauge 58 is deformed by force, and it indicates that the surface flatness of the concrete specimen meets the requirements of the hardness test. When it is necessary to measure the flatness of different surfaces of the concrete specimen, the concrete specimen can be turned over.

[0042] like Figure 7-Figure 9As shown, it also includes a motor 61 installed on the second support column 53, the output shaft of the motor 61 is connected to the support rod 54, the motor 61 is controlled to drive the support rod 54 to drive the knife edge ruler 55 and the guide frame 56 to rotate, and the second support column 53 is connected to a connecting frame 62 with a ring shape and concentric with the support rod 54, and the connecting frame 62 is connected to a wedge-shaped disk 63 suitable for squeezing the guide frame 56. The rotating guide frame 56 will be squeezed by the wedge disk 63 to continuously move back and forth along the support rod 54. In this way, during the rotation of the knife edge ruler 55, not only the guide frame 56 and the sliding shaft 57 make the elastic feeler gauge 58 always perpendicular to the knife edge ruler 55, but also the guide frame 56 automatically drives the elastic feeler gauge 58 to move back and forth along the knife edge ruler 55 through the sliding shaft 57, so that the measurement of the elastic feeler gauge 58 is convenient The different positions of the knife-edge ruler 55 and the surface flatness of the concrete specimen are measured. Two connecting springs 64 located inside the guide frame 56 are connected between the guide frame 56 and the support rod 54. The connecting springs 64 are used to reset the guide frame 56 moving along the support rod 54. A circle of arc blocks 65 suitable for squeezing the sliding shaft 57 is connected to the connecting frame 62. In the process of the guide frame 56 driving the sliding shaft 57 to move, the sliding shaft 57 will be squeezed by the arc blocks 65 to automatically drive the elastic feeler gauge 58 close to the knife-edge ruler 55 and the concrete specimen, so as to automatically measure the flatness of different positions of the concrete specimen. A second compression spring 66 located inside the guide frame 56 is connected between the sliding shaft 57 and the guide frame 56. The second compression spring 66 is used to reset the sliding shaft 57 moving along the guide frame 56.

[0043] like Figure 7 As shown, it also includes an electric screw rod 71 installed on the second mounting seat 51, and the support seat 52 is slidably set on the second mounting seat 51. The threaded shaft of the electric screw rod 71 is threadedly connected with the support seat 52. The electric screw rod 71 is controlled to drive the support seat 52 to move left and right along the second mounting seat 51, so as to adjust the position of the support seat 52. The right movement of the support seat 52 can make the knife edge ruler 55 and the elastic feeler gauge 58 move rightward and actively stick to the concrete specimen for flatness measurement.

[0044] like Figure 7 As shown, it also includes an electric screw rod 2 72 installed on the support base 52, and a support column 2 53 is slidably set on the support base 52. The threaded shaft of the electric screw rod 2 72 is threadedly connected with the support column 2 53. The electric screw rod 2 72 is controlled to drive the support column 2 53 to move up and down along the support base 52. The support column 2 53 can move the knife edge ruler 55 and the elastic feeler gauge 58 up and down, so as to adjust the height of the knife edge ruler 55 and the elastic feeler gauge 58, thereby increasing the range that can be measured and diversifying the usage methods.

[0045] like Fig.10As shown, a torsion spring 59 is also included. An elastic feeler gauge 58 is rotatably arranged on the right end of the sliding shaft 57. A torsion spring 59 is connected between the elastic feeler gauge 58 and the sliding shaft 57. The measuring end of the elastic feeler gauge 58 is close to and inclined toward the knife-edge gauge 55. There is a predetermined angle between the measuring end of the elastic feeler gauge 58 and the horizontal extension line of the measuring surface of the knife-edge gauge 55. When the left side of the concrete specimen contacts the elastic feeler gauge 58, the measuring end of the elastic feeler gauge 58 is closely attached to the concrete specimen in an inclined manner under the action of the torsion spring 59, thereby improving the effect of flatness measurement.

[0046] like Fig.11 As shown, a receiving groove 110 suitable for receiving the support plate 23 is opened at the lower part of the pressure platform 11 of the testing machine. The support plate 23 is slidably arranged on the slider 22 of the electric guide rail 21. By moving the support plate 23 backward on the slider 22 of the electric guide rail 21, the support plate 23 can be retracted into the receiving groove 110, and vice versa.

[0047] like Fig.12 and Fig.13 As shown, it also includes a door panel 81 slidably arranged on one side of the testing machine protective cover 14. When the testing machine lower pressure piece 13 moves downward to load and press the concrete specimen to perform a hardness test, the closed door panel 81 is used for protection to prevent the concrete specimen from being splashed after the concrete specimen is broken. The concrete specimen can be placed on the testing machine pressure platform 11 by opening the door panel 81. The door panel 81 is close to the support plate 23. Two compression springs 84 facing each other are connected between the door panel 81 and the testing machine protective cover 14. The compression springs 84 are used to reset the opened door panel 81. One side of the door panel 81 is connected to an inclined rod 82 with its left end tilted to the upper left. One of the two electric guide rails 21 (the right electric guide rail) is connected to the inclined rod 82. 21) is connected with a resistance rod 83 suitable for squeezing the inclined rod 82. When the slider 22 of the electric guide rail 21 drives the concrete specimen to move upward through the support plate 23 to assist in transferring the concrete specimen, the slider 22 on the right electric guide rail 21 will drive the resistance rod 83 to move upward to squeeze the inclined rod 82. The inclined rod 82 is subjected to force to drive the door panel 81 to move right and open, and the compression spring three 84 is deformed, so that the door panel 81 is automatically and synchronously opened when the concrete specimen is transferred upward, which is convenient for taking and placing the concrete specimen. Similarly, after the hardness test is completed, the support plate 23 is moved upward and the door panel 81 is opened, so that the concrete that has completed the hardness test on the pressure table 11 of the testing machine can be conveniently transferred to the support plate 23 for easy cleaning.

[0048] Obviously, the embodiments described above are only some embodiments of the present invention, rather than all embodiments. They only express the preferred implementation modes of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention.

[0049] It should be pointed out that, for ordinary technicians in this field, several modifications, increases and decreases in quantity, improvements and substitutions can be made without departing from the concept of the present invention. Therefore, based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection of the present invention.

Claims

1. A hardness testing device for machine-made sand concrete, comprising a pressure testing machine body, the pressure testing machine body comprising a testing machine pressure platform (11), a testing machine control console (12) arranged on the upper part of the testing machine pressure platform (11), a testing machine lower pressure piece (13) and a testing machine protective cover (14), characterized in that: It also includes an electric guide rail (21), two of the electric guide rails (21) are installed on the pressure platform (11) of the testing machine, and a support plate (23) is provided between the sliders (22) of the two electric guide rails (21); a mounting seat (31) is connected to the pressure platform (11) of the testing machine, a vertical support column (32) is provided on the mounting seat (31), a measuring ruler (33) is connected to one side of the support column (32), a measuring mark (34) is connected to the lower part of the support column (32), and the support column (32) is provided with a vertical support column (32). A second scale (35) having a length greater than that of the first scale (34) is slidably mounted on the upper portion of the support plate (23); an opening for the first scale (34) to pass through is formed on the support plate (23); the ends of the first scale (34) and the second scale (35) are both connected with pointers (36) indicating the scale on the measuring ruler (33); a protractor (41) is rotatably mounted on the second scale (35); a rotating mark (42) is rotatably mounted at the center of the protractor (41); and the end of the rotating mark (42) has a pointer line indicating the scale on the protractor (41); It also includes a second mounting seat (51) connected to the pressure platform (11) of the testing machine, the second mounting seat (51) is provided with a support seat (52), the support seat (52) is provided with a second support column (53), a support rod (54) is rotatably provided on the second support column (53), a knife-edge ruler (55) is connected to the end of the support rod (54), a guide frame (56) is slidably provided on the support rod (54), a sliding shaft (57) parallel to the support rod (54) is slidably provided on the guide frame (56), and an elastic feeler gauge (58) perpendicular to the knife-edge ruler (55) is provided at the right end of the sliding shaft (57).

2. The hardness testing device for machine-made sand concrete according to claim 1, characterized in that: It also includes a compression spring (37), the support column (32) is slidably arranged on the mounting seat (31), the compression spring (37) is connected between the support column (32) and the mounting seat (31), and a tension spring (38) is connected between the measuring scale (35) and the support column (32).

3. The hardness testing device for machine-made sand concrete according to claim 1, characterized in that: It also includes a torsion spring 1 (43) connected between the rotating mark (42) and the protractor (41), wherein the torsion spring 1 (43) keeps the angle between the rotating mark (42) and the protractor (41) less than ninety degrees.

4. The hardness testing device for machine-made sand concrete according to claim 1, characterized in that: It also includes a motor (61) mounted on the second support column (53), the output shaft of the motor (61) is connected to the support rod (54), the second support column (53) is connected to a connecting frame (62), the connecting frame (62) is connected to a wedge-shaped disk (63) suitable for squeezing the guide frame (56), a connecting spring (64) is connected between the guide frame (56) and the support rod (54), the connecting frame (62) is connected to a circle of arc blocks (65) suitable for squeezing the sliding shaft (57), and a second compression spring (66) located in the guide frame (56) is connected between the sliding shaft (57) and the guide frame (56).

5. The hardness testing device for machine-made sand concrete according to claim 1, characterized in that: It also includes an electric screw rod 1 (71) mounted on the second mounting seat (51), the support seat (52) is slidably arranged on the second mounting seat (51), and the threaded shaft of the electric screw rod 1 (71) is threadedly connected to the support seat (52).

6. The hardness testing device for machine-made sand concrete according to claim 1, characterized in that: It also includes a second electric screw rod (72) mounted on the support seat (52), the second support column (53) is slidably arranged on the support seat (52), and the threaded shaft of the second electric screw rod (72) is threadedly connected to the second support column (53).

7. The hardness testing device for machine-made sand concrete according to claim 1, characterized in that: The invention also comprises a second torsion spring (59), the elastic feeler gauge (58) being rotatably arranged at the right end of the sliding shaft (57), the second torsion spring (59) being connected between the elastic feeler gauge (58) and the sliding shaft (57), and a predetermined angle being spaced between the measuring end of the elastic feeler gauge (58) and the horizontal extension line of the measuring surface of the knife-edge gauge (55).

8. The hardness testing device for machine-made sand concrete according to claim 1, characterized in that: The lower part of the test machine pressure platform (11) is provided with a receiving groove (110) suitable for receiving the support plate (23), and the support plate (23) is slidably arranged on the slider (22) of the electric guide rail (21).

9. The hardness testing device for machine-made sand concrete according to claim 1, characterized in that: It also includes a door panel (81) slidably arranged on one side of the testing machine protective cover (14), the door panel (81) being close to the support plate (23), and a compression spring (84) being connected between the door panel (81) and the testing machine protective cover (14); an inclined inclined rod (82) being connected to one side of the door panel (81), and a resisting rod (83) suitable for squeezing the inclined rod (82) being connected to the slider (22) of one of the two electric guide rails (21).

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