Concrete hardness detection device

Abstract

The invention belongs to the technical field of hardness detection, and relates to a concrete hardness detection device. Comprising a testing machine base, a pressure-bearing table arranged on the testing machine base and a testing machine cylinder body, a controller electrically connected with the testing machine cylinder body is installed on one side of the testing machine cylinder body, a sliding frame slides on a lifting rod of the testing machine cylinder body, the sliding frame is suitable for sliding up and down within a preset range along the lifting rod, and the lower side of the sliding frame is connected with a testing machine pressing piece; a delay switch electrically connected with the controller is installed on the upper portion of the sliding frame. When the concrete test piece is placed, the delay switch is driven to move upwards and be extruded, so that the hardness test can be automatically carried out after the concrete test piece is placed, an additional step of manually controlling starting is omitted, and the operation is convenient; in addition, the sliding range of the sliding frame is preset, so that the function of size control is realized by skillfully utilizing the relation of components; and automatic protection is achieved during hardness detection, and discharging is convenient after detection is completed.

Description

Technical Field

[0001] The invention belongs to the technical field of hardness detection, and in particular relates to a concrete hardness detection device. Background Art

[0002] As a widely used building material, the hardness and strength of concrete are directly related to the safety and durability of buildings. Therefore, in construction projects, it is very important to use a concrete pressure testing machine to test the hardness (usually refers to compressive strength) of concrete specimens.

[0003] When using a concrete pressure testing machine to test the hardness of concrete specimens, it is usually necessary to set the corresponding load and pressure value of the concrete pressure testing machine according to the age and size specifications of the concrete specimens to ensure the accuracy of the test.

[0004] For example, the patent with patent announcement number CN215640678U and announcement date 2022.01.25 discloses a hardness testing device for machine-made sand concrete production. Like most existing concrete pressure testing machines, the hardness testing device controls the hydraulic cylinder to drive the lower pressure plate to move downward to perform a hardness test on the specimen on the placement block. However, it is impossible to automatically perform a hardness test after the specimen is placed, and it is even more impossible to confirm whether the size of the concrete specimen is in compliance. When the placed specimen is too large or too small, the final hardness test result will not meet the standard of the original specimen size.

[0005] In view of the shortcomings of the above-mentioned prior art, a concrete hardness testing device with a high degree of automation is designed to overcome the shortcomings of the prior art and automatically and synchronously perform hardness testing after placement, and can confirm that the size of the concrete specimen corresponds to the load pressure value. 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 concrete hardness testing device with a high degree of automation that can automatically and synchronously perform hardness testing after placement and can confirm that the size of the concrete specimen corresponds to the load pressure value.

[0007] In order to solve the above technical problems, the present invention provides a concrete hardness detection device, comprising a testing machine base, a pressure platform and a testing machine cylinder body arranged on the testing machine base, the testing machine cylinder body is located above the pressure platform, a controller electrically connected to the testing machine cylinder body is installed on one side of the testing machine cylinder body, a sliding frame is slid on the lifting rod of the testing machine cylinder body, the sliding frame is suitable for sliding up and down a predetermined range along the lifting rod, the lower side of the sliding frame is connected to a testing machine pressure piece located just above the pressure platform, the center of the pressure platform corresponds to the center of the lifting rod in the vertical direction; a delay switch electrically connected to the controller is installed on the upper part of the sliding frame, and the delay switch has a function of when the sliding frame moves up to a threshold along the lifting rod The trigger state is when the value is squeezed by the lifting rod, and the threshold value is reached after the sliding frame moves up 1 cm along the lifting rod; a swivel driven by a rotating drive group rotates on the base of the testing machine, the rotating drive group is arranged on the base of the testing machine, the upper side of the swivel is flush with the upper side of the pressure platform, the rotating drive group is electrically connected to the controller, a transparent and concave-shaped enclosure is connected to the upper side of the swivel, and a material guide frame suitable for corresponding to the opening side of the enclosure is connected to one side of the base of the testing machine, and a discharge port is provided on the lower side of the material guide frame, and a discharge plate corresponding to the opening side of the enclosure slides on the enclosure, and the discharge plate is driven by a sliding drive group to move along the enclosure, the sliding drive group is electrically connected to the controller, and the sliding drive group is arranged on the enclosure.

[0008] Preferably, the lifting rod consists of a lifting part that is lifted and lowered on the cylinder body of the testing machine and a pressing part connected to the lower side of the lifting part. The pressing part is provided with a guide groove for the sliding frame to slide up and down, and the upper side of the guide groove of the pressing part is provided with a trigger part suitable for squeezing the delay switch; the upper part of the lower pressure piece of the testing machine is provided with a resistance part, and the upper side of the resistance part is suitable for contacting and cooperating with the lower side of the pressure part, and the lower side of the pressure part and the upper side of the resistance part are spaced 1 cm apart.

[0009] Preferably, the sliding frame is composed of a crossbeam sliding through the guide groove and vertical plates respectively connected to the left and right sides of the crossbeam, the two vertical plates are connected to the lower pressure piece of the testing machine, and the delay switch is installed on the upper side of the crossbeam.

[0010] Preferably, the rotary drive group includes a gear ring connected to the lower side of the rotating ring, the gear ring surrounds the pressure platform, a servo motor is installed on the upper inner side of the testing machine base, and a gear meshing with the gear ring is connected to the output shaft of the servo motor.

[0011] Preferably, a sliding drive group includes a driving motor installed on the rear side of the right part of the enclosure, the driving motor is electrically connected to the controller, the output shaft of the driving motor is connected to a screw rod that rotates on the rear side of the left part of the enclosure, the screw rod is threadedly connected to a slider that is slidably arranged on the enclosure, the slider is suitable for sliding left and right along the enclosure, and a connecting rod that rotates between the slider and the unloading plate and moves in the horizontal direction and passes through the enclosure.

[0012] Preferably, a discharge port suitable for discharging the crushed concrete specimens to the guide frame is opened on one side of the testing machine base, and an oblique opening suitable for corresponding to the discharge port is opened at the eccentric upper side of the rotating ring, and the oblique opening is located on the opening side of the enclosure.

[0013] Preferably, it also includes an alignment plate, and there are two alignment plates sliding on the enclosure, which are relatively located on both sides of the unloading plate. The unloading plate is slidably arranged between the enclosure and the two alignment plates, and the two alignment plates are driven by two sliding drive groups to move toward each other. The sliding drive group is electrically connected to the controller, and the sliding drive group is arranged on the enclosure.

[0014] Preferably, the second sliding drive group includes a dual-axis motor installed on the outside of the enclosure, the dual-axis motor is electrically connected to the controller, the two output shafts of the dual-axis motor are connected to a screw rod 2, the screw rod 2 is threadedly connected to a slider 2 slidably arranged on the enclosure, and the two sliders 2 on the same screw rod are rotated between the same alignment plate and have a connecting rod 2 that is movable and runs through the enclosure.

[0015] The present invention overcomes the shortcomings of the prior art and can achieve the following beneficial effects: 1. When placing the concrete specimen, the delay switch is driven to move up and be squeezed, so that the hardness test can be automatically carried out after the concrete specimen is placed, eliminating the need for manual control and starting steps, and the operation is convenient; in addition, the sliding range of the sliding frame is predetermined, so that the relationship between the components is cleverly used to achieve the function of size control; and automatic protection is provided during hardness testing, and unloading is convenient after the test.

[0016] 2. Initially, the enclosure is staggered with the material guide frame to facilitate the placement of the concrete specimen. After the concrete specimen is placed, the open side of the enclosure is protected corresponding to the material guide frame to prevent the broken concrete specimen from splashing out, while eliminating the step of manually opening and closing the enclosure in the prior art.

[0017] 3. Use two alignment plates to align the concrete specimens, thereby ensuring uniform pressure and improving the accuracy and correctness of hardness testing. Multiple test data from the same batch are more standardized and consistent, reducing the complexity and uncertainty in subsequent data processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an assembly schematic diagram of the present invention.

[0019] Figure 2 This is the front view of the present invention, in which the testing machine base and the material guide frame are fully cut away.

[0020] Figure 3 For the present invention Figure 2 Enlarged view of point A in .

[0021] Figure 4It is a partial cross-sectional view of the swivel of the present invention.

[0022] Figure 5 It is a schematic diagram of the test machine base, enclosure, unloading plate and alignment plate of the present invention.

[0023] Figure 6 It is a schematic diagram of the dual-axis motor, the second screw rod and the second slider of the present invention.

[0024] Figure 7 For the present invention Figure 5 Schematic diagram of the rear side direction.

[0025] Figure 8 It is a schematic diagram of the driving motor, screw rod 1 and slider 1 of the present invention.

[0026] Fig. 9 It is a top view of the present invention.

[0027] The marks in the accompanying drawings provided by the present invention are: 1-testing machine base, 10-discharge port, 11-pressure platform, 2-testing machine cylinder, 21-controller, 30-delay switch, 31-lifting rod, 311-lifting part, 312-pressure applying part, 313-trigger part, 32-sliding frame, 321-crossbeam, 322-vertical plate, 33-testing machine lower pressure piece, 330-resistance part, 4-swivel, 40-bevel, 41-enclosure, 42-gear ring, 43-servo motor, 44-gear, 5-unloading plate, 51-driving motor, 52-screw rod one, 53-slider one, 54-connecting rod one, 6-alignment plate, 61-dual-axis motor, 62-screw rod two, 63-slider two, 64-connecting rod two, 7-material guide frame. DETAILED DESCRIPTION

[0028] 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.

[0029] 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.

[0030] A concrete hardness testing device, such as Figure 1 and Figure 2As shown, it includes a testing machine base 1, a pressure platform 11 and a testing machine cylinder 2 arranged on the testing machine base 1. The testing machine cylinder 2 is located above the pressure platform 11. A controller 21 electrically connected to the testing machine cylinder 2 is installed on one side of the testing machine cylinder 2. A sliding frame 32 slides on the lifting rod 31 of the testing machine cylinder 2. The sliding frame 32 is suitable for sliding up and down within a predetermined range along the lifting rod 31. The lower side of the sliding frame 32 is connected to a testing machine pressing piece 33 located directly above the pressure platform 11. The center of the pressure platform 11 corresponds to the center of the lifting rod 31 in the vertical direction. The controller 21 controls the testing machine cylinder 2 to drive the lifting rod 31 to extend so that the sliding frame 32 drives the testing machine pressing piece 33 to move downward to continuously and evenly load and pressurize the concrete specimen on the pressure platform 11, thereby performing hardness testing. Finally, the compressive strength of the concrete specimen is obtained by dividing the concrete specimen's breaking load by the specimen's pressure-bearing area until the concrete specimen is broken.

[0031] A delay switch 30 electrically connected to the controller 21 is installed on the upper part of the sliding frame 32. The delay switch 30 has a trigger state in which the sliding frame 32 is squeezed by the lifting rod 31 when it moves up to a threshold value along the lifting rod 31. The sliding frame 32 reaches the threshold value after moving up 1 cm along the lifting rod 31. The concrete specimen is placed on the pressure platform 11 and the testing machine lower pressure piece 33 is lifted up. The testing machine lower pressure piece 33 will drive the delay switch 30 to move up and be squeezed by the lifting rod 31 through the sliding frame 32. The delay switch 30 will control the delayed start of the testing machine cylinder 2 through the controller 21, so that the hardness test can be automatically performed after the concrete specimen is placed, eliminating the step of manually controlling the start, and the operation is convenient.

[0032] In addition, when hardness tests are carried out on multiple concrete specimens of the same batch with the same expiration date and size specifications in sequence, the corresponding load and pressure values ​​of the test machine cylinder 2 are pre-set, and the test machine cylinder 2 will drive the lifting rod 31 to lift the test machine lower pressure piece 33 through the sliding frame 32, so as to adjust the distance between the test machine lower pressure piece 33 and the pressure platform 11. For example, when the length, width and height of the concrete specimen are 15 cm, the distance between the test machine lower pressure piece 33 and the pressure platform 11 is 14 cm. When the concrete specimen is too large, it cannot be smoothly placed between the pressure platform 11 and the test machine lower pressure piece 33. When the concrete specimen is too small, the delay switch 30 cannot be smoothly squeezed into the trigger state. On the basis of automatic startup after placement, the relationship between the components is cleverly used to realize the function of size control; the above-mentioned delay switch 30 can also be selectively replaced by a distance sensor, changing the squeezing to a distance triggering method.

[0033] A rotating ring 4 driven to rotate by a rotating driving group is rotated on the test machine base 1. The rotating driving group is arranged on the test machine base 1. The upper side of the rotating ring 4 is flush with the upper side of the pressure platform 11. The rotating driving group is electrically connected to the controller 21. A transparent and concave-shaped enclosure 41 is connected to the upper side of the rotating ring 4. A material guide enclosure frame 7 suitable for corresponding to the opening side of the enclosure 41 is connected to one side of the test machine base 1. The lower side of the material guide enclosure frame 7 has a discharge port 10. Initially, the enclosure 41 is staggered with the material guide enclosure frame 7 (such as Fig. 9 ), to facilitate the placement of concrete specimens, when the concrete specimen is placed on the pressure platform 11 from the open side of the enclosure 41, the controller 21 controls the rotary drive group to delay the driving ring 4 to drive the enclosure 41 to rotate, so that the open side of the enclosure 41 corresponds to the material guide frame 7, and then the controller 21 controls the test machine cylinder 2 to work for hardness testing, so that before the hardness test, the enclosure 41 and the material guide frame 7 are automatically used for protection to avoid the splashing of broken concrete specimens, and at the same time, the step of manually opening and closing the enclosure 41 is omitted. A discharge plate 5 corresponding to the open side of the enclosure 41 is slidably arranged on the enclosure 41, and the discharge plate 5 is driven by the sliding drive group 1 to move along the enclosure 41, and the sliding drive group 1 and the The controller 21 is electrically connected, and the sliding drive group 1 is arranged on the enclosure 41. When the hardness test operation of the concrete specimen is completed and the testing machine cylinder 2 drives the lifting rod 31 to move up and reset, the controller 21 controls the sliding drive group 1 to drive the unloading plate 5 to move along the opening of the enclosure 41 to push the remaining concrete specimens on the pressure platform 11 from the opening of the enclosure 41 into the material guide frame 7. The material guide frame 7 will discharge the concrete specimens downward and place them in a container or conveyor belt for collection. Then the unloading plate 5 is reset, and the swivel 4 drives the enclosure 41 to rotate in the opposite direction and reset. At this time, the opening side of the enclosure 41 is staggered with the material guide enclosure 41, which makes it convenient to place the concrete to be tested for hardness.

[0034] like Figure 2 and Figure 3As shown, the lifting rod 31 is composed of a lifting part 311 that is lifted and lowered on the cylinder body 2 of the testing machine, and a pressure part 312 connected to the lower side of the lifting part 311. A guide groove is provided on the pressure part 312 for the sliding frame 32 to slide up and down. The upper side of the guide groove of the pressure part 312 has a trigger part 313 suitable for squeezing the delay switch 30. Initially, the sliding frame 32 is supported on the lower side of the guide groove of the pressure part 312. The lifting and lowering of the lifting rod 31 will drive the sliding frame 32 to rise and fall through the guide groove on the trigger part 313, so as to adjust the height of the lower pressure part 33 of the testing machine. When the concrete specimen on the pressure platform 11 is squeezed by the lower pressure part 33 of the testing machine, the sliding frame 32 is driven to move upward and downward. When the trigger part 313 moves up to the threshold value, the sliding frame 32 will drive the delay switch 30 to move up to be squeezed by the trigger part 313; the upper part of the testing machine's lower pressure piece 33 has a resistance part 330, and the upper side of the resistance part 330 is suitable for contacting and cooperating with the lower side of the pressure-applying part 312. No matter to which height the guide groove on the trigger part 313 drives the sliding frame 32 to rise or fall, there is always a 1 cm interval between the lower side of the pressure-applying part 312 and the upper side of the resistance part 330. Therefore, when the trigger part 313 squeezes the delay switch 30, the lower side of the pressure-applying part 312 will squeeze the upper side of the resistance part 330 downward, thereby driving the testing machine's lower pressure piece 33 to move downward for hardness detection.

[0035] like Figure 2 and Figure 3 As shown, the sliding frame 32 is composed of a crossbeam 321 that slides through the guide groove and vertical plates 322 that are respectively connected to the left and right sides of the crossbeam 321. The two vertical plates 322 are connected to the testing machine's lower pressure piece 33. The delay switch 30 is installed on the upper side of the crossbeam 321. When the concrete specimen is placed on the pressure platform 11 and the testing machine's lower pressure piece 33 is squeezed to move upward, the testing machine's lower pressure piece 33 will drive the crossbeam 321 to move upward along the guide groove through the vertical plates 322, and the crossbeam 321 will drive the delay switch 30 to move upward.

[0036] like Figure 1 , Figure 2 and Figure 4 As shown, the rotary drive group includes a gear ring 42 connected to the lower side of the swivel 4, the gear ring 42 surrounds the pressure platform 11, and a servo motor 43 is installed on the inner side of the upper part of the testing machine base 1. A gear 44 engaging with the gear ring 42 is connected to the output shaft of the servo motor 43. The servo motor 43 is controlled to drive the gear 44 to rotate and engage with the gear ring 42, and the gear ring 42 will drive the enclosure 41 to rotate through the swivel 4.

[0037] like Figure 7 and Figure 8As shown, the sliding drive group 1 includes a driving motor 51 installed on the right rear side of the enclosure 41, the driving motor 51 is electrically connected to the controller 21, the output shaft of the driving motor 51 is connected to a screw rod 52 rotating on the left rear side of the enclosure 41, the screw rod 52 is threadedly connected to a slider 53 slidably arranged on the enclosure 41, the slider 53 is suitable for sliding left and right along the enclosure 41, and a connecting rod 54 that moves in the horizontal direction and penetrates the enclosure 41 rotates between the slider 53 and the unloading plate 5, and the same batch of materials are sequentially unloaded. When multiple concrete specimens with the same maturity and size specifications are subjected to hardness testing, if automatic cleaning is required, the controller 21 controls the drive motor 51 to drive the screw rod 52 to rotate, the screw rod 52 will drive the slider to move, and the slider will push the unloading plate 5 along the enclosure 41 toward the material guide frame 7 through the connecting rod 54, so as to achieve automatic cleaning, safety and hardness testing efficiency; similarly, the drive motor 51 is controlled to drive the screw rod 52 to rotate in the opposite direction, and the slider 53 will pull the unloading plate 5 to reset through the connecting rod 54.

[0038] like Figure 5 As shown, a discharge port 10 suitable for discharging the crushed concrete specimen to the guide frame 7 is provided on one side of the testing machine base 1, and an oblique opening 40 suitable for corresponding to the discharge port 10 is provided at the eccentric position on the upper side of the swivel 4, and the oblique opening 40 is located on the opening side of the enclosure 41. When the swivel 4 drives the opening side of the enclosure 41 to rotate to the corresponding guide frame 7, the oblique opening 40 corresponds to the discharge port 10. After the hardness test is completed, the unloading plate 5 can push the crushed concrete specimen to be discharged from the oblique opening on the swivel 4 and the discharge port 10 on the testing machine base 1 to the guide frame 7.

[0039] like Figure 5 , Figure 6 and Fig. 9As shown, it also includes an alignment plate 6, and two alignment plates 6 are slidably arranged on the enclosure 41 and are relatively located on both sides of the discharge plate 5. The discharge plate 5 is slidably arranged between the enclosure 41 and the two alignment plates 6, and the two alignment plates 6 are respectively driven by two sliding drive groups 2 to move toward each other. The sliding drive group 2 is electrically connected to the controller 21, and the sliding drive group 2 is arranged on the enclosure 41. After the concrete specimen is placed on the pressure platform 11 from the opening side of the enclosure 41, the controller 21 controls the sliding drive group 2 to drive the two alignment plates 6 to approach each other, and the two alignment plates 6 will make the concrete specimen be located at the center of the pressure platform 11 in the left and right directions, and then the two alignment plates 6 are reset, and the controller 21 controls The servo motor 43 drives the swivel 4 to drive the enclosure 41 to rotate, and the enclosure 41 will drive the two alignment plates 6 to rotate counterclockwise by ninety degrees. At this time, the open side of the enclosure 41 corresponds to the material guide frame 7, and then the controller 21 controls the sliding drive group again to drive the two alignment plates 6 to approach each other, so that the concrete specimen is in the center of the pressure platform 11 in the front and rear directions, thereby ensuring uniform pressure, improving the accuracy and correctness of hardness detection, and making multiple test data of the same batch more standardized and consistent, reducing the complexity and uncertainty in subsequent data processing, and does not affect the placement of the concrete specimen before the first alignment, and the second alignment is carried out while the enclosure 41 and the material guide frame 7 are protected.

[0040] like Figure 8 and Fig. 9 As shown, the sliding drive group 2 includes a double-axis motor 61 installed on the outside of the enclosure 41, the double-axis motor 61 is electrically connected to the controller 21, and the two output shafts of the double-axis motor 61 are connected with screw rods 2 62, and the screw rods 2 62 are threadedly connected with sliders 2 63 slidably arranged on the enclosure 41, and the two sliders 2 63 on the same screw rod are rotated with the same alignment plate 6, and a connecting rod 2 64 that runs through the enclosure 41 is movable. When the concrete specimen on the pressure platform 11 is centered, the controller 21 controls the double-axis motor 61 to drive the two screw rods 2 62 to rotate, and the two screw rods 2 62 will respectively drive the two sliders 2 63 to approach each other, and the two sliders 2 63 will push the alignment plate 6 to move through the two connecting rods 2 64, so that the two alignment plates 6 are close to each other to align the concrete specimen (such as Fig. 9 ); Similarly, the dual-axis motor 61 is controlled to drive the screw rod 2 62 to rotate in the opposite direction, and the slider 2 63 will pull the alignment plate 6 to reset through the connecting rod 2 64, and the two alignment plates 6 will move away from each other.

[0041] 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.

[0042] 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 concrete hardness detection device, characterized in that: The invention comprises a test machine base (1), a pressure platform (11) arranged on the test machine base (1) and a test machine cylinder (2); a controller (21) electrically connected to the test machine cylinder (2) is installed on one side of the test machine cylinder (2); a sliding frame (32) slides on a lifting rod (31) of the test machine cylinder (2); the sliding frame (32) is suitable for sliding up and down along the lifting rod (31) within a predetermined range; a test machine pressing member (33) is connected to the lower side of the sliding frame (32); a delay switch (30) electrically connected to the controller (21) is installed on the upper part of the sliding frame (32); the delay switch (30) has a function of being activated when the sliding frame (32) moves along the lifting rod (31) When the lifting rod (31) moves up to a threshold value, the lifting rod (31) is pressed into a trigger state; a rotating ring (4) driven to rotate by a rotating drive group is rotated on the testing machine base (1); the rotating ring (4) is connected to a concave-shaped enclosure (41) on the upper side; a material guide enclosure frame (7) suitable for corresponding to the opening side of the enclosure (41) is connected to one side of the testing machine base (1); a discharge plate (5) corresponding to the opening side of the enclosure (41) is slidably disposed on the enclosure (41); the discharge plate (5) is driven to move along the enclosure (41) by a sliding drive group 1; and the sliding drive group 1 is disposed on the enclosure (41).

2. A concrete hardness detection device according to claim 1, characterized in that: The lifting rod (31) is composed of a lifting part (311) that is lifted and lowered on the test machine cylinder (2), and a pressure part (312) connected to the lower side of the lifting part (311); the pressure part (312) is provided with a guide groove for the sliding frame (32) to slide up and down; the upper side of the guide groove of the pressure part (312) is provided with a trigger part (313) suitable for squeezing the delay switch (30); the upper part of the test machine lower pressure piece (33) is provided with a resistance part (330), and the upper side of the resistance part (330) is suitable for contacting and cooperating with the lower side of the pressure part (312).

3. A concrete hardness detection device according to claim 2, characterized in that: The sliding frame (32) is composed of a crossbeam (321) that slides through the guide groove and vertical plates (322) that are respectively connected to both sides of the crossbeam (321). The two vertical plates (322) are connected to the testing machine lower pressing piece (33). The delay switch (30) is installed on the upper side of the crossbeam (321).

4. A concrete hardness detection device according to claim 1, characterized in that: The rotary drive group comprises a gear ring (42) connected to the lower side of the rotating ring (4), a servo motor (43) is mounted on the testing machine base (1), and a gear (44) meshing with the gear ring (42) is connected to the output shaft of the servo motor (43).

5. A concrete hardness detection device according to claim 1, characterized in that: The sliding drive group 1 includes a driving motor (51) installed on the enclosure (41), the output shaft of the driving motor (51) is connected to a screw rod 1 (52) that rotates on the enclosure (41), the screw rod 1 (52) is threadedly connected to a slider 1 (53) slidably arranged on the enclosure (41), and a connecting rod 1 (54) that rotates between the slider 1 (53) and the unloading plate (5) and runs through the enclosure (41).

6. A concrete hardness detection device according to claim 5, characterized in that: A discharge port (10) suitable for discharging crushed concrete specimens to the material guide enclosure (7) is provided on one side of the test machine base (1), and an oblique opening (40) suitable for corresponding to the discharge port (10) is provided at an eccentric position on the upper side of the rotating ring (4), and the oblique opening (40) is located on the opening side of the enclosure (41).

7. A concrete hardness detection device according to claim 5, characterized in that: It also includes an alignment plate (6), wherein two alignment plates (6) are slidably disposed on the enclosure (41) and are relatively located on both sides of the discharge plate (5), and the discharge plate (5) is slidably disposed between the enclosure (41) and the two alignment plates (6), and the two alignment plates (6) are respectively driven by two sliding drive groups (2) to move toward each other, and the sliding drive groups (2) are disposed on the enclosure (41).

8. A concrete hardness detection device according to claim 7, characterized in that: The second sliding drive group includes a double-axis motor (61) installed on the enclosure (41), and the two output shafts of the double-axis motor (61) are connected to the second screw rod (62), and the second screw rod (62) is threadedly connected to the second slider (63) slidably arranged on the enclosure (41), and the two sliders (63) on the same screw rod are both connected to the same alignment plate (6) by a second connecting rod (64) for rotation.

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