Calibration device for measuring concrete carbonization depth and method of using the same

Abstract

The present invention discloses a calibration device for a concrete carbonation depth measuring instrument, comprising a fixed base, a power mechanism and a calibration mechanism, wherein an installation frame is arranged on the upper end surface of the fixed base, a control box is arranged on the outer side surface of one side of the installation frame, a semiconductor refrigeration plate is arranged on the upper end surface inside the installation frame, the control box is controlled and connected with the semiconductor refrigeration plate, and a fixed plate is arranged inside the installation frame on both sides of the upper end surface of the fixed base, and a temperature sensor is arranged on the side surface of one side of the fixed plate. The present invention has a simple structure, a reasonable design, convenient operation, and a low calibration cost. It can quickly and effectively detect the zero error, indication error and indication repeatability of the concrete carbonation depth measuring instrument, and there is no need to repeatedly adjust the position and angle of the concrete carbonation depth measuring instrument, thereby improving the detection efficiency and reducing the burden on the staff. At the same time, it can ensure that the detection temperature is constant at 20 (±5°C), thereby improving the accuracy of calibration.

Description

Technical Field

[0001] The invention relates to the technical field of concrete detection equipment, in particular to a calibration device for a concrete carbonation depth measuring instrument and a use method thereof. Background Art

[0002] The concrete carbonation depth measuring instrument is mainly used to detect the carbonation depth of concrete. When measuring, the base plane of the instrument should be placed close to the flat concrete surface on one side of the hole. When the concrete surface around the hole is uneven, it should be smoothed with a grinding wheel to avoid measurement errors. Move the instrument so that the stylus is close to the hole wall, and move the stylus up and down until it stops at the boundary between the carbonized and uncarbonized layers. When the stylus stops at the measured depth of the hole wall, the pointer indicates a scale on the scale, which is the carbonation depth value. The reading is accurate to 0.25 mm. When the conditions are unfavorable for reading, press the button to lock the stylus and move the instrument to another place for reading.

[0003] Deficiencies of existing technology:

[0004] When calibrating the concrete carbonation depth measuring instrument, manual calibration is required, which has low calibration efficiency. At the same time, due to manual operation, errors are prone to occur. In addition, there are certain requirements for temperature during the calibration and detection process, and isothermal treatment needs to be ensured. The design of equipment is more expensive and the operation is more cumbersome. Summary of the invention

[0005] The object of the present invention is to provide a calibration device for a concrete carbonation depth measuring instrument and a method of using the same, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solutions: a calibration device for a concrete carbonization depth measuring instrument, comprising a fixed base, a power mechanism and a calibration mechanism, wherein an installation frame is arranged on the upper end surface of the fixed base, a control box is arranged on the outer side surface of one side of the installation frame, a semiconductor refrigeration sheet is arranged on the upper end surface inside the installation frame, the control box is control-connected with the semiconductor refrigeration sheet, fixing plates are arranged on both sides of the upper end surface of the fixed base inside the installation frame, a temperature sensor is arranged on the side surface of one side of the fixing plate, and the control box is electrically connected with the temperature sensor;

[0007] The power mechanism is located inside the installation frame and is arranged on a fixed plate, and the calibration mechanism is arranged on the power mechanism.

[0008] As a further improvement of the present invention, the power mechanism is composed of a support plate, a servo motor, a screw, a first mounting ring, a first mounting plate, a second mounting ring, a second mounting plate and a plurality of ball nuts. A support plate is arranged on the side surface of one side of the fixed plate, a servo motor is arranged on the upper end surface of the support plate, the control box is control-connected to the servo motor, a screw is movably arranged between the fixed plates, the servo motor is transmission-connected to the screw, a first mounting ring and a second mounting ring are respectively arranged at both ends of the screw, a first mounting plate and a second mounting plate are respectively arranged on the lower end surface of the first mounting ring and the lower end surface of the second mounting ring, and ball nuts are threadedly connected on both sides of the first mounting ring and the second mounting ring on the screw.

[0009] As a further improvement of the present invention, the calibration mechanism is composed of a fixed splint, a first electric telescopic rod, a movable splint, a flat plate, a second electric telescopic rod, a mounting block and a gauge block. A fixed splint is provided on the side of the first mounting plate close to the second mounting plate, a first electric telescopic rod is provided on the side of the other side of the first mounting plate, a movable splint is provided at the upper end of the first electric telescopic rod, a flat plate is provided on the side of the second mounting plate close to the first mounting plate, a second electric telescopic rod is provided on the lower end of the flat plate on the second mounting plate, a mounting block is provided at the upper end of the second electric telescopic rod, a gauge block is provided on the upper end surface of the mounting block, and the control box is control-connected to the first electric telescopic rod and the second electric telescopic rod respectively.

[0010] As a further improvement of the present invention, a plurality of supporting feet are arranged on the lower end surface of the fixed base, and guide rails are arranged on both sides of the upper end surface of the fixed base. Both sides of the lower ends of the first mounting plate and the second mounting plate are slidably connected with the sliding grooves arranged on the guide rails by setting sliders.

[0011] As a further improvement of the present invention, a transparent glass door is arranged on the side surface of one side of the installation frame, and a plurality of LED light strips are arranged on the side surface of the installation frame away from the transparent glass door.

[0012] As a further improvement of the present invention, the threads on the screw rod are arranged in a mirror image, a reinforcement ring is arranged at the center of the screw rod, and the upper end of the reinforcement ring is arranged on the upper end surface inside the installation frame.

[0013] As a further improvement of the present invention, a plurality of support rods are arranged on the side surfaces of the first mounting plate and the fixed plate, the upper ends of the support rods are arranged on the upper end surfaces of the supporting plate and the fixed clamping plate, and the first mounting plate is provided with a groove matching the movable clamping plate.

[0014] As a further improvement of the present invention, a buffer member is arranged on the upper end of the flat plate on the second mounting plate, and the buffer member comprises a mounting frame and a plurality of buffer springs. A mounting frame is arranged on the second mounting plate, and a plurality of buffer springs are arranged on the mounting frame.

[0015] As a further improvement of the present invention, the upper end surface of the fixed clamping plate and the lower end surface of the movable clamping plate are both provided with rubber sleeves, the flat plate is a secondary flat plate, and the gauge block is a fifth-level gauge block.

[0016] The present invention also provides a method for using a calibration device for a concrete carbonation depth measuring instrument, comprising the following steps:

[0017] First, the concrete carbonation depth measuring instrument to be tested is placed on the upper end surface of the fixed clamping plate, and then the first electric telescopic rod is started to retract, and the concrete carbonation depth measuring instrument is installed and fixed through the fixed clamping plate and the movable clamping plate. At the same time, the semiconductor refrigeration piece is controlled by the control box to control the temperature at 20 (±5°C) and isothermally balanced for 15 to 25 minutes, and the temperature is fed back in real time through the temperature sensor;

[0018] Zero position error detection: start the servo motor to drive the screw to rotate, push the first mounting plate and the second mounting plate to move toward each other through the ball nut, until the detection end of the concrete carbonation depth measuring instrument contacts the flat plate, turn off the servo motor, make the reference surface and the stylus of the concrete carbonation depth measuring instrument contact the flat plate at the same time, and observe the coincidence of the pointer and the zero scale line;

[0019] Mark error calibration, start the servo motor to drive the screw to rotate, push the first mounting plate and the second mounting plate to move in the opposite direction through the ball nut, then start the second electric telescopic rod, extend the second electric telescopic rod upward, make the gauge block contact with the flat plate, then push the first mounting plate and the second mounting plate to move towards each other through the ball nut, the reference surface of the concrete carbonization depth measuring instrument contacts the measuring surface of the gauge block, the stylus contacts the flat plate, and obtain the measurement value S1 of the concrete carbonization depth measuring instrument and the actual size S2 of the gauge block, and repeat the measurement 3 times to obtain the maximum measurement value B1 and the minimum measurement value B2, as well as the range coefficient Q;

[0020] Indication error: A1 = S1-S1

[0021] Indication repeatability: A2 = (B1-B2) / Q.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention is provided with a power mechanism, which is composed of a support plate, a servo motor, a screw, a first mounting ring, a first mounting plate, a second mounting ring, a second mounting plate and a plurality of ball nuts. Through the action of the power mechanism, the calibration can be automatically adjusted, and the position and angle of the concrete carbonization depth measuring instrument do not need to be repeatedly adjusted, thereby improving the detection efficiency and reducing the burden on the staff;

[0024] 2. The present invention is provided with a calibration mechanism, which is composed of a fixed clamp, a first electric telescopic rod, a movable clamp, a flat plate, a second electric telescopic rod, a mounting block and a gauge block. Through the action of the calibration mechanism, the zero position error, indication error and indication repeatability of the concrete carbonation depth measuring instrument can be quickly and effectively detected;

[0025] 3. The present invention arranges a semiconductor refrigeration plate on the upper end surface inside the installation frame, and the control box is controlled and connected to the semiconductor refrigeration plate. A temperature sensor is arranged on the side of one side of the fixed plate. The control box is electrically connected to the temperature sensor, which can ensure that the detection temperature is constant at 20 (±5°C) and improve the accuracy of calibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is an overall stereogram of a calibration device for a concrete carbonation depth measuring instrument;

[0027] Figure 2 It is a schematic diagram of the overall internal structure of a calibration device for a concrete carbonation depth measuring instrument;

[0028] Figure 3 It is a perspective view of the overall back side of a calibration device of a concrete carbonation depth measuring instrument;

[0029] Figure 4 A three-dimensional installation diagram of a first mounting plate and a second mounting plate of a calibration device of a concrete carbonation depth measuring instrument;

[0030] Figure 5 A top view of a second mounting plate of a calibration device for a concrete carbonation depth measuring instrument;

[0031] Figure 6 The present invention is a cross-sectional view showing the connection between the first mounting plate and the movable clamping plate of a calibration device for a concrete carbonation depth measuring instrument.

[0032] In the figure: 1. fixed base; 101. support foot; 102. guide rail; 2. power mechanism; 21. support plate; 22. servo motor; 23. screw rod; 24. first mounting ring; 25. first mounting plate; 251. support rod; 26. second mounting ring; 27. second mounting plate; 28. ball nut; 3. calibration mechanism; 31. fixed splint; 32. first electric telescopic rod; 33. movable splint; 34. flat plate; 35. second electric telescopic rod; 36. mounting block; 37. gauge block; 4. mounting frame; 41. transparent glass door; 42. LED light strip; 5. control box; 6. semiconductor refrigeration plate; 7. fixed plate; 8. temperature sensor; 9. reinforcement ring; 10. mounting frame; 11. buffer spring. DETAILED DESCRIPTION

[0033] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0034] It should be noted that when an element is referred to as being "fixed", "mounted", "connected" or "disposed" with another element, it may be directly on the other element or indirectly on the other element. It should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and 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 orientation, be constructed and operate in a specific orientation in the specification, and therefore cannot be understood as limiting the present invention.

[0035] As a further improvement of the present invention, the terms "first", "second", "third", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0036] See also Figure 1-6The present invention provides a technical solution: a calibration device for a concrete carbonation depth measuring instrument, comprising a fixed base 1, a power mechanism 2 and a calibration mechanism 3, a mounting frame 4 is welded on the upper end surface of the fixed base 1, a control box 5 is bolted on the outer surface of one side of the mounting frame 4, a semiconductor refrigeration plate 6 is bolted on the upper end surface inside the mounting frame 4, the control box 5 is connected to the semiconductor refrigeration plate 6 by a wire control, the semiconductor refrigeration plate 6 is controlled by the control box 5 to work, so that the temperature inside the mounting frame 4 is constant, a fixing plate 7 is bolted on both sides of the upper end surface of the fixed base 1 inside the mounting frame 4, a temperature sensor 8 is bolted on the side surface of one side of the fixing plate 7, the control box 5 is electrically connected to the temperature sensor 8 by a wire, so as to monitor the temperature inside the mounting frame 4;

[0037] The power mechanism 2 is located inside the mounting frame 4 and mounted on the fixing plate 7 , and the calibration mechanism 3 is mounted on the power mechanism 2 .

[0038] In some embodiments of the present invention, the power mechanism 2 is composed of a support plate 21, a servo motor 22, a screw 23, a first mounting ring 24, a first mounting plate 25, a second mounting ring 26, a second mounting plate 27 and a plurality of ball nuts 28. The support plate 21 is welded on the side surface of one side of the fixed plate 7, and the servo motor 22 is installed on the upper end surface of the support plate 21 by bolts. The control box 5 and the servo motor 22 are connected by wire control. The screw 23 is installed between the fixed plates 7 through a bearing. The servo motor 22 and the screw 23 are connected by gear transmission. The first mounting ring 24 and the second mounting ring 26 are respectively sleeved on both ends of the screw 23, and the lower end surface of the first mounting ring 24 The first mounting plate 25 and the second mounting plate 27 are welded to the lower end surfaces of the upper and second mounting rings 26, respectively. Ball nuts 28 are threadedly connected to the screw rod 23 on both sides of the first mounting ring 24 and the second mounting ring 26. During calibration, the concrete carbonation depth measuring instrument is placed on the upper end surface of the fixed clamping plate 31, and then the first electric telescopic rod 32 is started to retract, and the concrete carbonation depth measuring instrument is installed and fixed by the fixed clamping plate 31 and the movable clamping plate 33. The servo motor 22 is started to drive the screw rod 23 to rotate, and the first mounting plate 25 and the second mounting plate 27 are pushed to move toward each other through the ball nuts 28 until the detection end of the concrete carbonation depth measuring instrument contacts the flat plate 34.

[0039] In some embodiments of the present invention, the calibration mechanism 3 is composed of a fixed splint 31, a first electric telescopic rod 32, a movable splint 33, a flat plate 34, a second electric telescopic rod 35, a mounting block 36 and a gauge block 37. A fixed splint 31 is welded on the side of the first mounting plate 25 close to the second mounting plate 27, the first electric telescopic rod 32 is installed on the side of the other side of the first mounting plate 25 by bolts, the movable splint 33 is installed on the upper end of the first electric telescopic rod 32 by bolts, the flat plate 34 is installed on the side of the second mounting plate 27 close to the first mounting plate 25 by bolts, the second electric telescopic rod 35 is installed on the lower end of the flat plate 34 on the second mounting plate 27 by bolts, and the second electric telescopic rod 35 is installed on the second mounting plate 27 by bolts. A mounting block 36 is installed at the upper end of the electric telescopic rod 35 by bolts, and a gauge block 37 is installed on the upper end surface of the mounting block 36 by bolts. The control box 5 is controlled and connected with the first electric telescopic rod 32 and the second electric telescopic rod 35 respectively, so that the reference surface and the feeler of the concrete carbonation depth measuring instrument are in contact with the plate 34 at the same time, and the coincidence of the pointer and the zero scale line is observed. At the same time, the second electric telescopic rod 35 is started, and the gauge block 37 is in contact with the plate 34 by extending the second electric telescopic rod 35 upward, and then the first mounting plate 25 and the second mounting plate 27 are pushed to move toward each other by the ball nut 28, so that the reference surface of the concrete carbonation depth measuring instrument is in contact with the measuring surface of the gauge block 37, and the feeler is in contact with the plate 34.

[0040] In some embodiments of the present invention, a plurality of supporting legs 101 are welded on the lower end surface of the fixed base 1, and guide rails 102 are welded on both sides of the upper end surface of the fixed base 1 on the first mounting plate 25. Both sides of the lower ends of the first mounting plate 25 and the second mounting plate 27 are slidably connected to the slide grooves provided on the guide rails 102 through welding sliders, thereby ensuring that the first mounting plate 25 and the second mounting plate 27 can move in a specified direction.

[0041] In some embodiments of the present invention, a transparent glass door 41 is installed on the side of one side of the installation frame 4 through a hinge for easy observation, and a plurality of LED light strips 42 are installed on the side of the installation frame 4 away from the transparent glass door 41 through bolts to increase the light intensity inside the installation frame 4.

[0042] In some embodiments of the present invention, the threads on the screw rod 23 are distributed in a mirror image, and a reinforcement ring 9 is provided on the center sleeve of the screw rod 23 to increase the stability of the screw rod 23. The upper end of the reinforcement ring 9 is installed on the upper end surface inside the mounting frame 4 by bolts.

[0043] In some embodiments of the present invention, a plurality of support rods 251 are welded on the side surfaces of the first mounting plate 25 and the fixed plate 7, and the upper ends of the support rods 251 are welded to the upper end surfaces of the support plate 21 and the fixed splint 31, which can increase the stability of the support plate 21 and the fixed splint 31. A groove matching the movable splint 33 is provided on the first mounting plate 25.

[0044] In some embodiments of the present invention, a buffer is installed on the upper end of the flat plate 34 on the second mounting plate 27, and the buffer includes a mounting frame 10 and a plurality of buffer springs 11. The mounting frame 10 is installed on the second mounting plate 27 by bolts, and a plurality of buffer springs 11 are installed on the mounting frame 10 to facilitate buffering and prevent the detection end of the concrete carbonization depth meter from making hard contact with the flat plate 34.

[0045] In some embodiments of the present invention, the upper end surface of the fixed splint 31 and the lower end surface of the movable splint 33 are both hot-melt connected with rubber sleeves to provide a certain pressure buffer. The flat plate 34 is a secondary flat plate, and the gauge block 37 is a fifth-level gauge block.

[0046] The present invention also provides a method for using a calibration device for a concrete carbonation depth measuring instrument, comprising the following steps:

[0047] First, the concrete carbonation depth measuring instrument to be tested is placed on the upper end surface of the fixed clamping plate 31, and then the first electric telescopic rod 32 is started to retract, and the concrete carbonation depth measuring instrument is installed and fixed by the fixed clamping plate 31 and the movable clamping plate 33. At the same time, the semiconductor cooling plate 6 is controlled by the control box 5 to control the temperature at 20 (±5°C) and isothermally balanced for 15 to 25 minutes, and the temperature is fed back in real time by the temperature sensor 8;

[0048] Zero position error detection: start the servo motor 22 to drive the screw 23 to rotate, and push the first mounting plate 25 and the second mounting plate 27 to move toward each other through the ball nut 28 until the detection end of the concrete carbonation depth measuring instrument contacts the flat plate 34, and then turn off the servo motor 22, so that the reference surface and the stylus of the concrete carbonation depth measuring instrument contact the flat plate 34 at the same time, and observe the coincidence of the pointer and the zero scale line;

[0049] Mark error calibration, start the servo motor 22 to drive the screw 23 to rotate, push the first mounting plate 25 and the second mounting plate 27 to move in the opposite direction through the ball nut 28, then start the second electric telescopic rod 35, extend the second electric telescopic rod 35 upward, make the gauge block 37 contact the flat plate 34, then push the first mounting plate 25 and the second mounting plate 27 to move towards each other through the ball nut 28, the reference surface of the concrete carbonization depth measuring instrument contacts the measuring surface of the gauge block 37, the stylus contacts the flat plate 34, and obtain the measurement value S1 of the concrete carbonization depth measuring instrument and the actual size S2 of the gauge block, and repeat the measurement 3 times to obtain the maximum measurement value B1 and the minimum measurement value B2, as well as the range coefficient Q;

[0050] Indication error: A1 = S1-S1

[0051] Indication repeatability: A2 = (B1-B2) / Q.

[0052] In this device, the device is easy to operate and has low calibration cost. It can quickly and effectively detect the zero error, indication error and indication repeatability of the concrete carbonation depth measuring instrument. There is no need to repeatedly adjust the position and angle of the concrete carbonation depth measuring instrument, which improves the detection efficiency and reduces the burden on the staff. At the same time, it can ensure that the detection temperature is constant at 20 (±5℃), thereby improving the accuracy of calibration.

[0053] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0054] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A calibration device for a concrete carbonation depth measuring instrument, comprising a fixed base (1), a power mechanism (2) and a calibration mechanism (3), characterized in that: The upper end surface of the fixed base (1) is provided with a mounting frame (4), the outer side surface of one side of the mounting frame (4) is provided with a control box (5), the upper end surface inside the mounting frame (4) is provided with a semiconductor cooling plate (6), the control box (5) is control-connected with the semiconductor cooling plate (6), fixing plates (7) are provided inside the mounting frame (4) on both sides of the upper end surface of the fixed base (1), a temperature sensor (8) is provided on the side surface of one side of the fixing plate (7), and the control box (5) is electrically connected with the temperature sensor (8); the power mechanism (2) is located inside the mounting frame (4) and is provided on the fixing plate (7), and the calibration mechanism (3) is provided on the power mechanism ( 2), the power mechanism (2) is composed of a support plate (21), a servo motor (22), a screw (23), a first mounting ring (24), a first mounting plate (25), a second mounting ring (26), a second mounting plate (27) and a plurality of ball nuts (28), a support plate (21) is arranged on the side surface of one side of the fixing plate (7), a servo motor (22) is arranged on the upper end surface of the support plate (21), the control box (5) is control-connected to the servo motor (22), a screw (23) is movably arranged between the fixing plates (7), the servo motor (22) is transmission-connected to the screw (23), and first mounting rings are respectively arranged at both ends of the screw (23). (24) and a second mounting ring (26), a first mounting plate (25) and a second mounting plate (27) are respectively arranged on the lower end surface of the first mounting ring (24) and the lower end surface of the second mounting ring (26), a ball nut (28) is threadedly connected to the screw rod (23) on both sides of the first mounting ring (24) and the second mounting ring (26), the calibration mechanism (3) is composed of a fixed clamping plate (31), a first electric telescopic rod (32), a movable clamping plate (33), a flat plate (34), a second electric telescopic rod (35), a mounting block (36) and a gauge block (37), a fixed clamping plate (31) is arranged on the side of the first mounting plate (25) close to the second mounting plate (27) 31), a first electric telescopic rod (32) is arranged on the side surface of the other side of the first mounting plate (25), a movable clamping plate (33) is arranged on the upper end of the first electric telescopic rod (32), a flat plate (34) is arranged on the side surface of the second mounting plate (27) close to the first mounting plate (25), a second electric telescopic rod (35) is arranged on the second mounting plate (27) at the lower end of the flat plate (34), a mounting block (36) is arranged on the upper end of the second electric telescopic rod (35), a gauge block (37) is arranged on the upper end surface of the mounting block (36), and the control box (5) is respectively connected to the first electric telescopic rod (32) and the second electric telescopic rod (35) for control.

2. The calibration device for the concrete carbonization depth measuring instrument according to claim 1, characterized in that: A plurality of supporting feet (101) are arranged on the lower end surface of the fixed base (1), and guide rails (102) are arranged on both sides of the first mounting plate (25) on the upper end surface of the fixed base (1), and both sides of the lower ends of the first mounting plate (25) and the second mounting plate (27) are slidably connected to the slide grooves arranged on the guide rails (102) by means of sliders.

3. The calibration device for the concrete carbonization depth measuring instrument according to claim 1, characterized in that: A transparent glass door (41) is arranged on the side surface of one side of the installation frame (4), and a plurality of LED light strips (42) are arranged on the side surface of the installation frame (4) away from the transparent glass door (41).

4. The calibration device for the concrete carbonization depth measuring instrument according to claim 1, characterized in that: The threads on the screw rod (23) are arranged in a mirror image, a reinforcement ring (9) is arranged at the center of the screw rod (23), and the upper end of the reinforcement ring (9) is arranged on the upper end surface inside the installation frame (4).

5. The calibration device for the concrete carbonization depth measuring instrument according to claim 1, characterized in that: A plurality of support rods (251) are provided on the side surfaces of the first mounting plate (25) and the fixed plate (7); the upper ends of the support rods (251) are arranged on the upper end surfaces of the supporting plate (21) and the fixed clamping plate (31); and the first mounting plate (25) is provided with a groove matching the movable clamping plate (33).

6. The calibration device for the concrete carbonization depth measuring instrument according to claim 1, characterized in that: A buffer member is provided on the upper end of the flat plate (34) on the second mounting plate (27), the buffer member comprising a mounting frame (10) and a plurality of buffer springs (11); a mounting frame (10) is provided on the second mounting plate (27), and a plurality of buffer springs (11) are provided on the mounting frame (10).

7. The calibration device for the concrete carbonization depth measuring instrument according to claim 1, characterized in that: The upper end surface of the fixed clamping plate (31) and the lower end surface of the movable clamping plate (33) are both provided with rubber sleeves, the flat plate (34) is a secondary flat plate, and the gauge block (37) is a fifth-level gauge block.

8. A method for using a calibration device for a concrete carbonation depth measuring instrument according to any one of claims 1 to 6, characterized in that: The following steps are involved: First, the concrete carbonation depth measuring instrument to be tested is placed on the upper end surface of the fixed clamping plate (31), and then the first electric telescopic rod (32) is started to retract, and the concrete carbonation depth measuring instrument is installed and fixed by the fixed clamping plate (31) and the movable clamping plate (33). At the same time, the semiconductor cooling plate (6) is controlled by the control box (5) to control the temperature at 20 (±5°C) and isothermally balanced for 15 to 25 minutes, and the temperature is fed back in real time by the temperature sensor (8); Zero position error detection: starting the servo motor (22) to drive the screw rod (23) to rotate, pushing the first mounting plate (25) and the second mounting plate (27) to move toward each other through the ball nut (28) until the detection end of the concrete carbonation depth measuring instrument contacts the flat plate (34), turning off the servo motor (22), making the reference surface and the stylus of the concrete carbonation depth measuring instrument contact the flat plate (34) at the same time, and observing the coincidence of the pointer and the zero scale line; Mark error calibration, start the servo motor (22) to drive the screw (23) to rotate, push the first mounting plate (25) and the second mounting plate (27) to move in the opposite direction through the ball nut (28), then start the second electric telescopic rod (35), extend the second electric telescopic rod (35) upward, make the gauge block (37) contact the plate (34), then push the first mounting plate (25) and the second mounting plate (27) to move in the opposite direction through the ball nut (28), the reference surface of the concrete carbonization depth measuring instrument contacts the measuring surface of the gauge block (37), the stylus contacts the plate (34), obtain the measurement value S1 of the concrete carbonization depth measuring instrument, the actual size S2 of the gauge block, and repeat the measurement three times to obtain the maximum measurement value B1 and the minimum measurement value B2, as well as the range coefficient Q; Indication error: A1=S1-S1 Indication repeatability: A2=(B1-B2) / Q.

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