Concrete hardness detection device for civil engineering

Abstract

The invention relates to the technical field of concrete hardness detection, in particular to a civil engineering concrete hardness detection device which comprises a base, a drill bit and a mounting cylinder coaxially fixed to the top of the drill bit, a lifting mechanism is mounted on the base, a motor is mounted on the lifting mechanism, and a transmission pipe is coaxially arranged at the output end of the motor. And more than two grinding blocks are arranged on the side wall of the mounting cylinder in a sliding manner. The device integrates a drilling function, an annular broaching groove expansion function and a strength testing function, and compared with a traditional concrete strength detection mode, tools do not need to be replaced frequently, so that the detection efficiency of workers is improved; in the drilling working process, when the drilled hole reaches the set depth, the grinding block can automatically stretch out, so that the annular broaching groove is expanded in the hole wall, and when the diameter of the annular broaching groove is expanded to reach the set value, the diameter of the annular broaching groove cannot be continuously increased, so that the drilling machine has the high automation degree.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete hardness detection, and particularly relates to a concrete hardness detection device for civil engineering. Background Art

[0002] The concrete strength detection pull-out method is a practical method for judging the overall strength by measuring the local destructive force on the concrete surface. During specific operation, it is necessary to first drill holes on the concrete surface, install special anchor fittings, and then apply tensile force with the help of a pulling device until the concrete surface layer is cracked or the anchor fittings are pulled out. By recording the maximum tensile force value at the time of failure and combining it with the calibration curve or empirical formula in the laboratory, the actual strength of the concrete can be estimated.

[0003] Special tools need to be prepared before detection, such as electric drills, anchor fittings, pull-out meters, dynamometers, etc. The operation process is roughly divided into five steps: the first step is to select points, avoiding the position of steel bars and choosing a flat surface area; the second step is to drill holes, with the hole diameter matching the anchor fittings; the third step is to clean the holes; the fourth step is to install the anchor fittings to ensure vertical embedding into the holes; the fifth step is to connect the pull-out meter and apply tensile force evenly until failure, and record the peak data. Safety goggles and gloves need to be worn throughout the process to prevent debris from splashing and hurting people.

[0004] In the traditional concrete strength detection process, most operations are carried out manually using corresponding tools in different processes. However, frequent tool replacement will affect work efficiency, and it is very time-consuming and laborious for manual operations in multiple processes. Summary of the Invention

[0005] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a concrete hardness detection device for civil engineering to solve the above problems.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows: A concrete hardness detection device for civil engineering, including a base, on which a lifting mechanism is installed, a motor is installed on the lifting mechanism, the output end of the motor is coaxially provided with a transmission pipe, and further includes a drill bit and a mounting cylinder coaxially fixed on the top of the drill bit. More than two grinding blocks are slidably arranged on the side wall of the mounting cylinder. The top of the mounting cylinder is coaxially rotatably connected with a sleeve. The bottom end of the transmission pipe coaxially passes through the sleeve and extends into the interior of the mounting cylinder, and more than two connecting rods are hinged on the bottom end, and the other end of the connecting rod is hinged with the grinding block; the drill bit is used for drilling work. When the grinding block extends out of the mounting cylinder, since the grinding block will rotate with the drill bit, an annular pulling groove will be expanded on the hole wall. The top of the sleeve is fixedly connected with a locking ring. The transmission pipe is provided with an annular groove and a fitting groove. A locking mechanism is installed on the locking ring. Both the fitting groove and the annular groove are matched with the stop portion of the locking mechanism; an arc-shaped groove is opened at the bottom of the locking ring, and a stop block matched with the arc-shaped groove is fixedly connected to the top of the base.

[0007] Preferably, more than two sliding grooves are formed in the side wall of the mounting cylinder, and the outer surface of the grinding block is in sliding fit with the inner wall of the sliding groove. When the grinding block slides along the sliding groove, it can extend out of or retract into the mounting cylinder.

[0008] Preferably, an annular pressing plate is fixedly connected to the bottom end of the transmission pipe, the top end of the connecting rod is hinged to the side wall of the annular pressing plate, and a first spring is installed between the bottom of the annular pressing plate and the top of the drill bit. When the annular pressing plate moves close to the drill bit, the connecting rod drives the grinding block to extend out of the mounting cylinder.

[0009] Preferably, a fixing ring is coaxially and fixedly connected to the transmission pipe, and both the annular groove and the fitting groove are formed on the outer surface of the fixing ring; The fitting groove includes a clamping groove and an opening provided on one side of the clamping groove, and a blocking body is installed near the opening, and the outer surface of the blocking body is set as an arc surface.

[0010] Preferably, the locking mechanism includes a sliding groove formed in the inner wall of the locking ring, a clamping block is slidably fitted in the sliding groove, a second spring is installed between the side of the clamping block away from the transmission pipe and the inner wall of the sliding groove, a pull rod is fixedly connected to the side of the clamping block close to the second spring, and the other end of the pull rod passes through the locking ring and a fixing cap is fixedly connected to the end; In the initial state, the clamping block is stuck inside the clamping groove. When the fixing ring rotates relative to the locking ring, the pressure of the clamping block against the blocking body increases, the clamping block moves along the outer surface of the blocking body, and the clamping block moves out through the opening on one side of the clamping groove.

[0011] Preferably, the annular groove is located above the fitting groove, and the vertical length of the clamping groove is greater than the vertical length of the clamping block.

[0012] Preferably, a collecting cavity is provided in the drill bit, more than two material suction holes are provided on the drill bit, the collecting cavity is internally communicated with the material suction holes, a communicating pipe is provided at the top of the drill bit, the top end of the communicating pipe is inserted into the interior of the transmission pipe, the bottom end of the communicating pipe is internally communicated with the collecting cavity, a discharge cylinder is rotatably sleeved on the transmission pipe, a discharge port is formed in the transmission pipe located inside the discharge cylinder, the discharge cylinder is internally communicated with the transmission pipe through the discharge port, and an interface is provided on the discharge cylinder; A key groove is formed on the outer surface of the communicating pipe, a key block is provided on the inner wall of the annular pressing plate, and the outer surface of the key block is in sliding fit with the inner wall of the key groove.

[0013] Preferably, it further includes a lifting plate, the motor is installed on the top of the lifting plate, the bottom of the lifting plate is rotatably connected with a pressure measuring cylinder, and the output end of the motor is coaxially and fixedly connected to the top of the pressure measuring cylinder; the top end of the transmission pipe is coaxially inserted into the pressure measuring cylinder, and the end is fixedly connected with a sliding body, the sliding body is slidably matched with the inner wall of the pressure measuring cylinder, and a pressure sensor is installed between the inner bottom wall of the pressure measuring cylinder and the top of the sliding body, and the pulling force for lifting the transmission pipe can be monitored by the pressure sensor.

[0014] Preferably, the lifting mechanism includes a slide rail, a guiding block is fixedly connected to the lifting plate, the slide rail is slidably matched with the guiding block, an oil cylinder is installed on the top of the slide rail, and the free end of the oil cylinder is fixedly connected to the guiding block.

[0015] Preferably, a guiding rod is fixedly connected to the top of the base, a stabilizing plate is rotatably connected to the outer surface of the locking ring, and both the lifting plate and the stabilizing plate are slidably connected through the guiding rod.

[0016] The beneficial effects of the present invention are as follows: 1. The present invention integrates functions of drilling, annular grooving expansion, and strength testing. Compared with traditional concrete strength detection methods, there is no need to frequently replace tools, thus improving the detection efficiency of the staff.

[0017] 2. During the drilling operation of the present invention, when the drilling reaches the set depth, the grinding block will automatically extend, thereby expanding an annular groove on the hole wall. Moreover, when the diameter of the annular groove expands to the set value, the diameter of the annular groove will not continue to increase, making the present invention have a high degree of automation.

[0018] 3. During the drilling operation of the present invention, the drill bit can move up and down relative to the transmission pipe. Coupled with the setting of the first spring, when the bottom of the drill bit touches a harder substance, the up-and-down movement of the drill bit can prevent the drill bit from getting stuck in the concrete, and through the setting of the first spring, the vibration on the drill bit can be reduced from being transmitted to the upper components, having a shock-absorbing effect.

[0019] 4. After the concrete strength detection of the present invention is completed, only by pulling the fixed cap can the grinding block be quickly retracted, with convenient operation, further improving the practicality of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of the present invention.

[0021] Figure 2 is a schematic cross-sectional structure diagram of the pressure measuring cylinder of the present invention.

[0022] Figure 3 is a schematic cross-sectional structure diagram of the locking ring of the present invention.

[0023] Figure 4 Schematic cross-sectional structure diagram of the installation cylinder of the present invention.

[0024] Figure 5 Schematic structure diagram of the drill bit of the present invention.

[0025] Figure 6 Schematic structure diagram of the fixing ring of the present invention.

[0026] Figure 7 Schematic structure diagram of the annular groove of the present invention.

[0027] Figure 8 Schematic diagram of tear simulation in the concrete test of the present invention.

[0028] In the drawings: 1, base; 2, transmission pipe; 3, drill bit; 4, installation cylinder; 5, grinding block; 6, connecting rod; 7, sleeve; 8, locking ring; 9, annular groove; 10, arc groove; 11, stop block; 12, clamping groove; 13, fixing ring; 14, blocking body; 15, annular pressing plate; 16, first spring; 17, sliding groove; 18, clamping block; 19, second spring; 20, pull rod; 21, fixing cap; 22, collecting cavity; 23, material suction hole; 24, connecting pipe; 25, key groove; 26, lifting plate; 27, motor; 28, pressure measuring cylinder; 29, sliding body; 30, pressure sensor; 31, slide rail; 32, guiding block; 33, oil cylinder; 34, guiding rod; 35, stabilizing plate; 36, discharge cylinder; 37, annular groove. Detailed implementation manners

[0029] The following will refer to the reference Figures 1 to 8 to describe the embodiments of the present invention in detail. Those skilled in the art should understand that these implementation manners are only used to explain the technical principle of the present invention and are not intended to limit the protection scope of the present invention.

[0030] A concrete hardness detection device for civil engineering, as Figure 1 , Figure 2 and Figure 5 shown, includes a base 1, a lifting mechanism is installed on the base 1, a motor 27 is installed on the lifting mechanism, a transmission pipe 2 is coaxially provided at the output end of the motor 27, and further includes a drill bit 3 and an installation cylinder 4 coaxially fixed on the top of the drill bit 3. Through the setting of the lifting mechanism, the lifting of the drill bit 3 can be realized, and in cooperation with the motor 27, the drill bit 3 can be driven to rotate, so as to realize the drilling work of the device.

[0031] As Figure 1 , Figure 4 , Figure 5 and Figure 7As shown, there are more than two grinding blocks 5 slidably arranged on the side wall of the mounting cylinder 4. There are more than two sliding grooves opened on the side wall of the mounting cylinder 4, and the outer surface of the grinding block 5 is in sliding fit with the inner wall of the sliding groove. During the working process of this device, the mounting cylinder 4 will rotate following the drill bit 3. When the grinding block 5 extends out of the mounting cylinder 4, since the grinding block 5 will rotate following the mounting cylinder 4, an annular pull groove 37 will be expanded on the hole wall.

[0032] The top of the mounting cylinder 4 is coaxially and rotatably connected with a sleeve 7. The bottom end of the transmission pipe 2 coaxially passes through the sleeve 7 and extends into the interior of the mounting cylinder 4, and there are more than two connecting rods 6 hinged to the bottom end. The other end of the connecting rod 6 is hinged to the grinding block 5. The bottom end of the transmission pipe 2 is fixedly connected with an annular pressing plate 15. The top end of the connecting rod 6 is hinged to the side wall of the annular pressing plate 15. A first spring 16 is installed between the bottom of the annular pressing plate 15 and the top of the drill bit 3. When the transmission pipe 2 extends into the mounting cylinder 4, the annular pressing plate 15 approaches the top of the drill bit 3, and the connecting rod 6 drives the grinding block 5 to extend out of the mounting cylinder 4.

[0033] As Figure 2 , Figure 3 and Figure 6 shown, the top of the sleeve 7 is fixedly connected with a locking ring 8. The transmission pipe 2 is provided with an annular groove 9 and a fitting groove. A locking mechanism is installed on the locking ring 8. Both the fitting groove and the annular groove 9 are matched with the stop part of the locking mechanism. The transmission pipe 2 is coaxially fixedly connected with a fixing ring 13. Both the annular groove 9 and the fitting groove are opened on the outer surface of the fixing ring 13. The fitting groove includes a clamping groove 12 and an opening is provided on one side of the clamping groove 12, and a blocking body 14 is installed near the opening. The outer surface of the blocking body 14 is set as an arc surface.

[0034] An arc groove 10 is opened at the bottom of the locking ring 8. The top of the base 1 is fixedly connected with a stop block 11 that is matched with the arc groove 10. The locking mechanism includes a sliding groove 17 opened on the inner wall of the locking ring 8. A clamping block 18 is slidably fitted in the sliding groove 17. A second spring 19 is installed between the side of the clamping block 18 away from the transmission pipe 2 and the inner wall of the sliding groove 17. The side of the clamping block 18 close to the second spring 19 is fixedly connected with a pull rod 20. The other end of the pull rod 20 passes through the locking ring 8 and the end is fixedly connected with a fixing cap 21. In the initial state, the clamping block 18 is stuck inside the clamping groove 12. At this time, when the transmission pipe 2 drives the fixing ring 13 to rotate, the clamping block 18 abuts against the blocking body 14 to make the locking ring 8 rotate. When the locking ring 8 descends to the limit, the stop block 11 is stuck into the inside of the arc groove 10. When the fixing ring 13 continues to rotate, the locking ring 8 can no longer rotate, and the pressure of the clamping block 18 against the blocking body 14 increases. Since the outer surface of the blocking body 14 is set as an arc surface, the clamping block 18 moves along the outer surface of the blocking body 14 (at the same time, the second spring 19 is compressed and the clamping block 18 is retracted into the sliding groove 17), and the clamping block 18 moves out through the opening on one side of the clamping groove 12.

[0035] AsFigure 3 and Figure 6 As shown in Figure 6 , the annular groove 9 is located above the fitting groove, and the vertical length of the clamping groove 12 is greater than the vertical length of the clamping block 18.

[0036] As Figure 2 , Figure 4 and Figure 5 shown in Figure 2 , Figure 4 and Figure 5 , a collection cavity 22 is provided in the drill bit 3, and more than two material suction holes 23 are provided on the drill bit 3. The collection cavity 22 is internally communicated with the material suction holes 23. A communication pipe 24 is provided at the top of the drill bit 3. The top end of the communication pipe 24 is inserted into the interior of the transmission pipe 2, and the bottom end of the communication pipe 24 is internally communicated with the collection cavity 22. A discharge cylinder 36 is rotatably sleeved on the transmission pipe 2. A discharge port is provided on the transmission pipe 2 located in the discharge cylinder 36. The discharge cylinder 36 is internally communicated with the transmission pipe 2 through the discharge port, and a joint is provided on the discharge cylinder 36; the device is also provided with a cooling device, such as a water supply pipe, which is not shown. During the drilling operation, the cooling device sprays cooling water towards the drill hole, which can cool the drill bit 3 and wash the inner wall of the drill hole at the same time; the joint is connected to an external material extraction device, such as a water pump. When the external material extraction device is turned on, the mixture of dust and water in the drill hole is sequentially passed through the material suction holes 23, the collection cavity 22, the communication pipe 24, the transmission pipe 2, and finally discharged through the joint on the discharge cylinder 36 to achieve the cleaning of the interior of the drill hole.

[0037] A key groove 25 is provided on the outer surface of the communication pipe 24, and a key block (not shown) is provided on the inner wall of the annular pressing plate 15. The outer surface of the key block is slidably matched with the inner wall of the key groove 25. When the transmission pipe 2 drives the annular pressing plate 15 to rotate, through the cooperation of the key block and the key groove 25, the communication pipe 24 rotates synchronously with the annular pressing plate 15, that is, the drill bit 3 rotates.

[0038] As Figure 1 and Figure 2 shown in Figure 1 and Figure 2 , it further includes a lifting plate 26. The motor 27 is installed on the top of the lifting plate 26. The bottom of the lifting plate 26 is rotatably connected with a pressure measuring cylinder 28. The output end of the motor 27 is coaxially and fixedly connected to the top of the pressure measuring cylinder 28; the top end of the transmission pipe 2 is coaxially inserted into the pressure measuring cylinder 28, and an end portion is fixedly connected with a sliding body 29. The sliding body 29 is slidably matched with the inner wall of the pressure measuring cylinder 28. The sliding body 29 can only slide up and down in the pressure measuring cylinder 28. For example, the cross section of the sliding body 29 is set as a polygon. When the motor 27 drives the pressure measuring cylinder 28 to rotate, the transmission pipe 2 and the sliding body 29 both rotate synchronously with the pressure measuring cylinder 28; a pressure sensor 30 is installed between the inner bottom wall of the pressure measuring cylinder 28 and the top of the sliding body 29; when the lifting plate 26 drives the pressure measuring cylinder 28 to rise, an upward pulling force is applied to the sliding body 29, and the pressure sensor 30 can monitor the intensity of the pulling force in real time.

[0039] The lifting mechanism includes a slide rail 31. A guide block 32 is fixedly connected to the lifting plate 26. The slide rail 31 is slidably engaged with the guide block 32. An oil cylinder 33 is installed at the top of the slide rail 31. The free end of the oil cylinder 33 is fixedly connected to the guide block 32. When the free end of the oil cylinder 33 extends or contracts, it can drive the lifting plate 26 to descend or ascend.

[0040] As Figure 1 and Figure 3 shown, a guide rod 34 is fixedly connected to the top of the base 1. A stabilizing plate 35 is rotatably connected to the outer surface of the locking ring 8. Both the lifting plate 26 and the stabilizing plate 35 are slidably connected through the guide rod 34. Through the cooperative setting of the lifting plate 26, the stabilizing plate 35 and the guide rod 34, the stability of the lifting of the locking ring 8 and the lifting plate 26 is improved, that is, the stability of the operation of this device is improved.

[0041] The drilling operation of this device: Place this device on the concrete and align the drill bit 3 with the pre-drilling position, then start the motor 27 and the oil cylinder 33, driving the drill bit 3 to move downward while rotating, and the drill bit 3 drills the concrete.

[0042] It should be noted that in the initial state, the block 18 is stuck inside the slot 12. Since the vertical length of the slot 12 is greater than the vertical length of the block 18, and with the setting of the first spring 16, the drill bit 3 can move up and down relative to the transmission pipe 2. Since the concrete contains different substances, such as stones, etc., when the bottom of the drill bit 3 touches a harder substance, the drill bit 3 can move up and down, which can reduce the possibility of the drill bit 3 being stuck in the concrete, and with the setting of the first spring 16, it can reduce the transmission of vibrations on the drill bit 3 to the upper components, having a shock-absorbing effect and further improving the practicality of this device; It is worth noting that during the drilling process, the block 18 is inside the slot 12, and the up and down movement distance of the block 18 in the slot 12 is limited. The upward movement distance of the drill bit 3 relative to the transmission pipe 2 (i.e., the length of the transmission pipe 2 extending into the installation cylinder 4) is not sufficient to drive the grinding block 5 to extend out of the installation cylinder 4.

[0043] As the drill bit 3 and the locking ring 8 gradually descend, when the locking ring 8 descends to the limit, that is, when the drill bit 3 drills to the specified depth, at this time the stop block 11 is stuck inside the arc-shaped groove 10. When the fixed ring 13 continues to rotate, the locking ring 8 can no longer rotate, increasing the pressure of the block 18 against the blocking body 14. Since the outer surface of the blocking body 14 is set as an arc surface, the block 18 moves along the outer surface of the blocking body 14, and at the same time the second spring 19 is compressed, the block 18 is received into the chute 17, and the block 18 moves out through the opening on one side of the slot 12, that is, the locking ring 8 is disengaged from the fixed ring 13.

[0044] Since the locking ring 8 can no longer move downward, and the transmission pipe 2 continues to move downward with the fixing ring 13, the transmission pipe 2 extends into the installation cylinder 4, the annular pressing plate 15 approaches the top of the drill bit 3, and at the same time the first spring 16 is compressed, the connecting rod 6 drives the grinding block 5 to extend out of the installation cylinder 4, and the grinding block 5 abuts against the hole wall. It should be noted that since the grinding block 5 rotates with the installation cylinder 4, an annular pulling groove 37 is thus formed on the hole wall.

[0045] It is worth noting that when the length of the grinding block 5 extending out of the installation cylinder 4 reaches the set value, that is, the diameter of the annular pulling groove 37 reaches the set value, and at the same time the fixing ring 13 descends until the clamping block 18 corresponds to the annular groove 9, the second spring 19 abuts against the clamping block 18 and snaps into the inside of the annular groove 9, so that the fixing ring 13 can no longer descend, thereby locking the position of the transmission pipe 2, that is, the diameter of the annular pulling groove 37 is fixed.

[0046] When the concrete strength test is carried out for pulling out this device: start the oil cylinder 33 to drive the guide block 32 to rise, so that the lifting plate 26 rises, the pressure measuring cylinder 28 moves upward and pulls the sliding body 29, thereby applying an upward pulling force to the transmission pipe 2 (the pressure sensor 30 can monitor the strength of the pulling force in real time); it should be noted that at this time, the state of the clamping block 18 is that it is snapped into the inside of the annular groove 9, and the state of the grinding block 5 is that it extends into the inside of the annular pulling groove 37. At this time, the position of the grinding block 5 is locked, that is, the grinding block 5 cannot be retracted. When an upward pulling force is applied to the transmission pipe 2, the sleeve 7 pulls the drill bit 3, so that the grinding block 5 applies an upward pressure to the inner top wall of the annular pulling groove 37. As the oil cylinder 33 continues to increase the pressure, the pressure of the grinding block 5 abutting against the inner top wall of the annular pulling groove 37 gradually increases, Figure 8 until the concrete is damaged, and the staff records the peak pressure data.

[0047] After the pulling out test work is completed, pull the fixing cap 21, and the pull rod 20 pulls the clamping block 18 to separate it from the annular groove 9, thereby releasing the limit on the transmission pipe 2. The first spring 16 abuts against the annular pressing plate 15 to rise and move away from the drill bit 3, and the connecting rod 6 pulls the grinding block 5 to retract into the inside of the installation cylinder 4.

[0048] It should be noted that in the description of the present invention, the terms indicating directions or position relationships such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or position relationships shown in the drawings. This is only for the convenience of description, rather than indicating or implying that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0049] In addition, it should be noted that in the description of the present invention, unless otherwise clearly defined and limited, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0050] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A concrete hardness detection device for civil engineering, comprising a base (1), characterized in that, A lifting mechanism is installed on the base (1), and a motor (27) is installed on the lifting mechanism. A transmission pipe (2) is coaxially provided at the output end of the motor (27). It further includes a drill bit (3) and a mounting cylinder (4) coaxially fixed to the top of the drill bit (3). More than two grinding blocks (5) are slidably arranged on the side wall of the mounting cylinder (4). The top of the mounting cylinder (4) is coaxially rotatably connected to a sleeve (7). The bottom end of the transmission pipe (2) coaxially passes through the sleeve (7) and extends into the interior of the mounting cylinder (4), and more than two connecting rods (6) are hinged to the bottom end. The other end of the connecting rod (6) is hinged to the grinding block (5); A locking ring (8) is fixedly connected to the top of the sleeve (7). An annular groove (9) and a fitting groove are provided on the transmission pipe (2). A locking mechanism is installed on the locking ring (8). Both the fitting groove and the annular groove (9) match the stop portion of the locking mechanism; An arc-shaped groove (10) is formed at the bottom of the locking ring (8), and a stop block (11) matching the arc-shaped groove (10) is fixedly connected to the top of the base (1).

2. The concrete hardness detection device for civil engineering according to claim 1, characterized in that, More than two sliding grooves are formed on the side wall of the mounting cylinder (4), and the outer surface of the grinding block (5) is slidably matched with the inner wall of the sliding groove.

3. The concrete hardness detection device for civil engineering according to claim 1, characterized in that, An annular pressing plate (15) is fixedly connected to the bottom end of the transmission pipe (2). The top end of the connecting rod (6) is hinged to the side wall of the annular pressing plate (15). A first spring (16) is installed between the bottom of the annular pressing plate (15) and the top of the drill bit (3).

4. The concrete hardness detection device for civil engineering according to claim 1, characterized in that, A fixed ring (13) is coaxially fixedly connected to the transmission pipe (2). Both the annular groove (9) and the fitting groove are formed on the outer surface of the fixed ring (13); The fitting groove includes a clamping groove (12) and an opening provided on one side of the clamping groove (12), and a blocking body (14) is installed near the opening. The outer surface of the blocking body (14) is set as an arc-shaped surface.

5. The concrete hardness detection device for civil engineering according to claim 4, wherein, The locking mechanism includes a sliding groove (17) formed on the inner wall of the locking ring (8). A clamping block (18) is slidably matched in the sliding groove (17). A second spring (19) is installed between the side of the clamping block (18) away from the transmission pipe (2) and the inner wall of the sliding groove (17). A pull rod (20) is fixedly connected to the side of the clamping block (18) close to the second spring (19). The other end of the pull rod (20) passes through the locking ring (8) and a fixed cap (21) is fixedly connected to the end.

6. The concrete hardness detection device for civil engineering according to claim 5, characterized in that, The annular groove (9) is located above the fitting groove, and the vertical length of the clamping groove (12) is greater than the vertical length of the clamping block (18).

7. The concrete hardness detection device for civil engineering according to claim 3, wherein A collection cavity (22) is provided in the drill bit (3). More than two material suction holes (23) are provided on the drill bit (3). The collection cavity (22) is internally connected to the material suction holes (23). A connecting pipe (24) is provided at the top of the drill bit (3). The top end of the connecting pipe (24) is inserted into the interior of the transmission pipe (2), and the bottom end of the connecting pipe (24) is internally connected to the collection cavity (22). A discharge cylinder (36) is rotatably sleeved on the transmission pipe (2). A discharge port is formed on the transmission pipe (2) located in the discharge cylinder (36). The discharge cylinder (36) is internally connected to the transmission pipe (2) through the discharge port. An interface is provided on the discharge cylinder (36); A keyway (25) is formed on the outer surface of the connecting pipe (24), and a key block is provided on the inner wall of the annular pressing plate (15). The outer surface of the key block is in sliding fit with the inner wall of the keyway (25).

8. The concrete hardness detection device for civil engineering according to claim 1, wherein, It further includes a lifting plate (26). A motor (27) is installed on the top of the lifting plate (26). The bottom of the lifting plate (26) is rotatably connected to a pressure measuring cylinder (28). The output end of the motor (27) is coaxially and fixedly connected to the top of the pressure measuring cylinder (28). The top end of the transmission pipe (2) is coaxially inserted into the pressure measuring cylinder (28), and a sliding body (29) is fixedly connected to the end. The sliding body (29) is in sliding fit with the inner wall of the pressure measuring cylinder (28). A pressure sensor (30) is installed between the inner bottom wall of the pressure measuring cylinder (28) and the top of the sliding body (29).

9. The concrete hardness detection device for civil engineering according to claim 8, characterized in that, The lifting mechanism includes a slide rail (31). A guide block (32) is fixedly connected to the lifting plate (26). The slide rail (31) is in sliding fit with the guide block (32). An oil cylinder (33) is installed on the top of the slide rail (31). The free end of the oil cylinder (33) is fixedly connected to the guide block (32).

10. The concrete hardness detection device for civil engineering according to claim 8, characterized in that, A guide rod (34) is fixedly connected to the top of the base (1). A stabilizing plate (35) is rotatably connected to the outer surface of the locking ring (8). Both the lifting plate (26) and the stabilizing plate (35) are slidably connected through the guide rod (34).

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