Steel bar protective layer thickness measuring device

Abstract

The invention belongs to the technical field of thickness measurement, and particularly relates to a reinforcing steel bar protective layer thickness measuring device which comprises a measuring cylinder, a positioning clamping mechanism, an automatic thickness measuring mechanism, a perpendicularity detection feedback mechanism, a measurement result confirmation mechanism and a reinforcing steel bar diameter synchronous feedback mechanism. The device can rapidly, automatically and accurately detect the thickness of the steel bar protective layer, automatically adjust the perpendicularity of the thickness measuring mechanism and the reinforced concrete formwork, ensure the accuracy of the detection position, and avoid inaccurate measurement caused by perpendicularity errors; whether a measurement result is in an allowable error range can be automatically and quickly judged based on a thickness measurement result, whether the result is qualified is quickly and automatically compared and confirmed, and the measurement efficiency is improved; the diameter of the steel bar can be synchronously detected and fed back when the device is fixed, an allowable error value of a protective layer thickness measurement result is automatically adjusted based on the diameter of the steel bar, the larger the diameter is, the smaller the allowable error value is, and accurate feedback of a detection result is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of thickness measurement, and particularly relates to a device for measuring the thickness of the steel bar protective layer. Background Art

[0002] The steel bar protective layer refers to the layer of concrete in a concrete component that protects the steel bars from being directly exposed. Its thickness is the vertical distance from the outer edge of the steel bar to the concrete surface. It can prevent the steel bars from directly contacting media such as air, water, acid, alkali, and salt, avoid the corrosion of the steel bars, and extend the service life of the structure. The alkaline environment of the concrete can form a passivation film on the surface of the steel bars, further enhancing the protection effect.

[0003] Currently, it is necessary to measure the thickness of the steel bar protective layer. If the thickness of the steel bar protective layer is insufficient, the steel bars are prone to corrosion, resulting in the cracking and spalling of the concrete, a decrease in the structural bearing capacity, and even potential safety hazards. If the thickness of the steel bar protective layer is too large, the effective stress-bearing cross-section of the component will be reduced, the stiffness will be decreased, and cracks will appear in advance, affecting the structural performance. For example, the patent with the publication number CN110672022A proposes a device for controlling and measuring the thickness of the steel bar protective layer during the construction of reinforced concrete projects. Traditionally, the thickness of the steel bar protective layer is commonly measured directly with a ruler or a feeler gauge, but such a measurement method has large errors and cannot quickly determine whether the currently measured thickness of the steel bar protective layer meets the standard, affecting the accuracy and efficiency of the measurement work. Summary of the Invention

[0004] The purpose of the present invention is to address the above problems and provide a device for measuring the thickness of the steel bar protective layer.

[0005] To achieve the above object, the present invention adopts the following technical solutions: A device for measuring the thickness of the steel bar protective layer includes a measuring cylinder, and further includes: A positioning and clamping mechanism, fixedly installed on one side of the bottom of the measuring cylinder, for fixing the entire device to the steel bar; An automatic thickness measurement mechanism, installed inside the measuring cylinder; A detection perpendicularity feedback mechanism, installed on the moving end of the automatic thickness measurement mechanism, and the detection perpendicularity feedback mechanism controls the action of the positioning and clamping mechanism; A measurement result confirmation mechanism, fixedly installed on the outer wall of the measuring cylinder; A steel bar diameter synchronous feedback mechanism, installed on the positioning and clamping mechanism and electrically connected to the measurement result confirmation mechanism.

[0006] In the above-mentioned steel bar cover thickness measuring device, the positioning and fixing mechanism includes a U-shaped positioning plate. Two electric push rods are symmetrically and fixedly inserted at the upper end of the U-shaped positioning plate. The lower moving ends of the two electric push rods are fixedly connected to the same pressing plate. Anti-slip rubber pads are fixedly installed at the lower end of the pressing plate and the inner bottom of the U-shaped positioning plate. A deflection motor is fixedly installed on one side of the U-shaped positioning plate, and the output end of the deflection motor is fixedly connected to one side of the lower end of the measuring cylinder.

[0007] In the above-mentioned steel bar cover thickness measuring device, the automatic thickness measuring mechanism includes a measuring rod movably inserted at the bottom of the measuring cylinder. The upper end of the measuring rod is fixedly connected to a measuring block. Pulling springs sleeved outside the measuring rod are fixedly installed at the lower end of the measuring block and the inner bottom of the inner wall of the measuring cylinder. An infrared receiver is fixedly installed at the top of the measuring block. An infrared emitter is fixedly inserted at the top of the measuring cylinder. The lower end of the measuring rod penetrates through the lower end of the measuring cylinder and is fixedly connected to an installation cylinder. A contact plate is arranged on the lower side of the installation cylinder. Two side plates symmetrically arranged about the installation cylinder are fixedly connected to the upper end of the contact plate. The two side plates and the installation cylinder are rotatably connected through a transmission shaft. Torque return springs sleeved outside the transmission shaft are fixedly installed on the opposite sides of the side plates and the installation cylinder. The detection verticality feedback mechanism is fixedly installed on the outer wall of one of the side plates and is in transmission connection with the transmission shaft. Two groups of limit locking mechanisms for limiting the measuring block are symmetrically installed on the top side wall of the measuring cylinder.

[0008] In the above-mentioned steel bar cover thickness measuring device, the detection verticality feedback mechanism includes a feedback circular shell. Two arc-shaped sliding rods are symmetrically and fixedly installed on the upper side of the inner wall of the feedback circular shell. Both ends of the arc-shaped sliding rods are fixedly connected to support plates fixedly connected to the inner wall of the feedback circular shell. A sliding plate is slidably sleeved outside the arc-shaped sliding rods. A compensation spring sleeved outside the arc-shaped sliding rods is fixedly connected between the sliding plate and the support plate. A forward trigger switch and a reverse trigger switch are respectively fixedly installed on the opposite sides of the two sliding plates. One end of the transmission shaft penetrates into the feedback circular shell and is coaxial with the center of the feedback circular shell. A pressing plate arranged between the two sliding plates is fixedly connected to the shaft wall of the end of the transmission shaft located inside the feedback circular shell.

[0009] In the above-mentioned steel bar protective layer thickness measuring device, the measurement result confirmation mechanism includes a confirmation shell. One side of the inner wall of the confirmation shell is rotatably connected to an adjustment screw rod. An adjustment motor for driving the adjustment screw rod to rotate is fixedly installed on the outer wall of the confirmation shell. An adjustment seat is threadedly sleeved on the rod wall of the adjustment screw rod. A U-shaped lifting plate is fixedly installed on one side of the adjustment seat. Two pressure switches are installed up and down on the inner wall of the U-shaped lifting plate. A thickness value scale plate is fixedly installed on the outer wall of the confirmation shell. A marking needle is fixedly installed on one side of the adjustment seat. The end of the marking needle away from the adjustment seat penetrates through a strip-shaped opening opened on the side wall of the confirmation shell and extends outside the confirmation shell, and is arranged on one side of the thickness value scale plate. A plurality of guide slide rods arranged side by side are fixedly installed on the inner wall of the confirmation shell. The same force-bearing plate is slidably sleeved outside the plurality of guide slide rods. A plurality of holding springs sleeved outside the guide slide rods are fixedly installed between the upper end of the force-bearing plate and the inner wall top of the confirmation shell. A feedback permanent magnet plate is fixedly installed at the lower end of the force-bearing plate. A feedback electromagnetic plate opposite to the feedback permanent magnet plate is fixedly installed at the bottom of the inner wall of the confirmation shell. The force-bearing plate is arranged between the two pressure switches. The U-shaped lifting plate and the two pressure switches are connected by an error tolerance adjustment mechanism.

[0010] In the above-mentioned steel bar protective layer thickness measuring device, the steel bar diameter synchronous feedback mechanism includes an insulating cylinder fixedly installed on the upper end of the U-shaped positioning plate. A feedback resistance rod is fixedly installed on one side of the inner wall of the insulating cylinder. A synchronous rod is fixedly installed on the upper end of the extrusion plate. The upper end of the synchronous rod penetrates into the insulating cylinder. A feedback conductive contact piece in electrical contact with the feedback resistance rod is fixedly connected to the rod wall of the upper end of the synchronous rod.

[0011] In the above-mentioned steel bar protective layer thickness measuring device, the limit locking mechanism includes an extension shell fixedly installed on the outer wall of the measuring cylinder. A plurality of limit slide rods arranged side by side are fixedly installed on the inner wall of the extension shell. The same push-pull plate is slidably sleeved outside the plurality of limit slide rods. A plurality of return springs sleeved outside the limit slide rods are fixedly connected between the push-pull plate and the opposite side of the extension shell. A triangular blocking block is fixedly installed on the side wall of the push-pull plate. A through hole for the triangular blocking block to penetrate into is opened on the side wall of the measuring cylinder. The triangular blocking block abuts against the lower end of the measuring block. A suction permanent magnet plate is fixedly installed on the side of the push-pull plate away from the triangular blocking block. A suction electromagnetic plate opposite to the suction permanent magnet plate is fixedly installed at the rear side of the inner wall of the extension shell.

[0012] In the above-mentioned device for measuring the thickness of the steel bar protection layer, the error tolerance adjustment mechanism includes a plurality of fixed sliding rods fixedly installed inside the U-shaped lifting plate. Two moving plates are symmetrically slidably connected up and down outside the plurality of fixed sliding rods. The pressure switch is fixedly installed on the side wall of the moving plate. A plurality of connecting springs sleeved outside the fixed sliding rods are fixedly connected to the opposite sides of the moving plate and the U-shaped lifting plate. An adjusting permanent magnet plate is fixedly installed on the side of the moving plate away from the pressure switch. An adjusting electromagnetic plate is fixedly installed on the inner wall of the U-shaped lifting plate and is arranged opposite to the adjusting permanent magnet plate.

[0013] Compared with the existing technology, the beneficial effects of the present invention are as follows: 1. By setting the measuring cylinder, the automatic thickness measuring mechanism, the detection verticality feedback mechanism, and the positioning and fixing mechanism, it is possible to quickly and automatically accurately detect the thickness of the steel bar protection layer, and can automatically adjust the verticality of the automatic thickness measuring mechanism relative to the reinforced concrete formwork, ensuring that the detection work of the thickness of the steel bar protection layer is in an accurate position state, thereby effectively ensuring the detection accuracy and avoiding the problem of inaccurate thickness measurement caused by the error of the verticality of the detection position between the automatic thickness measuring mechanism and the reinforced concrete formwork.

[0014] 2. By setting the measurement result confirmation mechanism and the automatic thickness measuring mechanism, it is possible to automatically and quickly judge whether the measurement result is within the allowable error range based on the thickness measurement result, and then quickly and automatically compare and confirm whether the measurement result is qualified, effectively improving the measurement efficiency.

[0015] 3. By setting the steel bar diameter synchronous feedback mechanism and the error tolerance adjustment mechanism, it is possible to detect and feedback the diameter of the steel bar synchronously when fixing the entire measuring device, and automatically adjust the allowable error value of the measurement result of the thickness of the steel bar protection layer based on the diameter of the steel bar. The larger the diameter of the steel bar, the smaller the allowable error value of the thickness of the steel bar protection layer, ensuring the accuracy of the detection result feedback. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a three-dimensional structural schematic diagram of the present invention; Figure 2 is a front sectional structural schematic diagram of the present invention; Figure 3 is a structural schematic diagram of the positioning and fixing mechanism of the present invention; Figure 4 is a sectional structural schematic diagram of the automatic thickness measuring mechanism of the present invention; Figure 5 is a side sectional structural schematic diagram of the detection verticality feedback mechanism of the present invention; Figure 6 is a sectional structural schematic diagram of the measurement result confirmation mechanism of the present invention; Figure 7 It is a schematic cross-sectional structure diagram of the steel bar diameter synchronous feedback mechanism of the present invention; Figure 8 It is a schematic cross-sectional structure diagram of the limit locking mechanism of the present invention; Figure 9 It is a schematic structure diagram of the error tolerance adjustment mechanism of the present invention.

[0017] In the figure: 1 measuring cylinder, 2 positioning and fixing mechanism, 21 U-shaped positioning plate, 22 electric push rod, 23 extrusion plate, 24 deflection motor, 3 automatic thickness measuring mechanism, 31 measuring rod, 32 measuring block, 33 pulling spring, 34 infrared receiver, 35 infrared transmitter, 36 mounting cylinder, 37 abutting plate, 38 side plate, 39 transmission shaft, 310 torsion reset spring, 4 detection perpendicularity feedback mechanism, 41 feedback circular shell, 42 arc-shaped slide bar, 43 support plate, 44 sliding plate, 45 compensation spring, 46 forward trigger switch, 47 reverse trigger switch, 48 pressing plate, 5 measurement result confirmation mechanism, 51 confirmation shell, 52 adjusting screw, 53 adjusting motor, 54 adjusting seat, 55 U-shaped lifting plate, 56 pressure switch, 57 thickness value scale plate, 58 marking needle, 59 guiding slide bar, 510 stress plate, 511 holding spring, 512 feedback permanent magnet plate, 513 feedback electromagnetic plate, 6 steel bar diameter synchronous feedback mechanism, 61 insulating cylinder, 62 feedback resistance rod, 63 synchronous rod, 64 feedback conductive connecting piece, 7 limit locking mechanism, 71 extension shell, 72 limit slide bar, 73 push-pull plate, 74 return spring, 75 triangular blocking block, 76 suction permanent magnet plate, 77 suction electromagnetic plate, 8 error tolerance adjustment mechanism, 81 fixed slide bar, 82 moving plate, 83 connecting spring, 84 adjusting permanent magnet plate, 85 adjusting electromagnetic plate. Detailed implementation manners

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0019] As Figures 1-9 shown, a device for measuring the thickness of the steel bar protective layer includes a measuring cylinder 1, and further includes: A positioning and fixing mechanism 2, fixedly installed on one side of the bottom of the measuring cylinder 1, used to fix the entire device to the steel bar. The positioning and fixing mechanism 2 includes a U-shaped positioning plate 21. Two electric push rods 22 are symmetrically and fixedly inserted at the upper end of the U-shaped positioning plate 21. The lower moving ends of the two electric push rods 22 are fixedly connected to the same extrusion plate 23. Anti-slip rubber pads are fixedly installed at the lower end of the extrusion plate 23 and the inner bottom of the U-shaped positioning plate 21. A deflection motor 24 is fixedly installed on one side of the U-shaped positioning plate 21. The output end of the deflection motor 24 is fixedly connected to one side of the lower end of the measuring cylinder 1.

[0020] The automatic thickness measuring mechanism 3 is installed inside the measuring tube 1. The automatic thickness measuring mechanism 3 includes a measuring rod 31 movably inserted in the bottom of the measuring tube 1. The upper end of the measuring rod 31 is fixedly connected with a measuring block 32. The lower end of the measuring block 32 and the bottom of the inner wall of the measuring tube 1 are fixedly installed with a pulling spring 33 sleeved outside the measuring rod 31. The top of the measuring block 32 is fixedly installed with an infrared receiver 34. The top of the measuring tube 1 is fixedly inserted with an infrared transmitter 35. The lower end of the measuring rod 31 passes through the lower end of the measuring tube 1 and is fixedly connected with a mounting cylinder 36. The mounting cylinder 36 is fixedly installed with a mounting cylinder 36. A resistance plate 37 is provided on the lower side, and two side plates 38 symmetrically arranged about the mounting cylinder 36 are fixedly connected to the upper end of the resistance plate 37. The two side plates 38 and the mounting cylinder 36 are rotatably connected via a transmission shaft 39. A torsion return spring 310 sleeved on the outside of the transmission shaft 39 is fixedly provided on the opposite side of the side plate 38 and the mounting cylinder 36. A verticality detection feedback mechanism 4 is fixedly provided on the outer wall of one of the side plates 38 and is transmission-connected to the transmission shaft 39. Two sets of limit locking mechanisms 7 for limiting the measuring block 32 are symmetrically provided on the top side wall of the measuring tube 1.

[0021] The limit locking mechanism 7 includes an extension shell 71 fixedly mounted on the outer wall of the measuring tube 1, and a plurality of limit sliding rods 72 arranged side by side are fixedly mounted on the inner wall of the extension shell 71. The plurality of limit sliding rods 72 are slidably sleeved with the same push-pull plate 73 outside. The push-pull plate 73 and the extension shell 71 are fixedly connected on the opposite side with a plurality of push-back springs 74 sleeved on the outside of the limit sliding rod 72. A triangular stop block 75 is fixedly mounted on the side wall of the push-pull plate 73. A through opening is provided on the side wall of the measuring tube 1 for the triangular stop block 75 to extend through. The triangular stop block 75 abuts against the lower end of the measuring block 32. A suction permanent magnetic plate 76 is fixedly mounted on the side of the push-pull plate 73 away from the triangular stop block 75. A suction electromagnetic plate 77 arranged opposite to the suction permanent magnetic plate 76 is fixedly mounted on the rear side of the inner wall of the extension shell 71.

[0022] The verticality detection feedback mechanism 4 is installed on the moving end of the automatic thickness measuring mechanism 3, and the verticality detection feedback mechanism 4 controls the action of the positioning and fixing mechanism 2. The verticality detection feedback mechanism 4 includes a feedback circular shell 41, and two arc-shaped slide bars 42 are symmetrically fixedly installed on the upper side of the inner wall of the feedback circular shell 41. Both ends of the arc-shaped slide bar 42 are fixedly connected with a support plate 43 fixedly connected to the inner wall of the feedback circular shell 41. A sliding plate 44 is slidably sleeved on the outside of the arc-shaped slide bar 42, and a compensation spring 45 sleeved on the outside of the arc-shaped slide bar 42 is fixedly connected between the sliding plate 44 and the support plate 43. A forward trigger switch 46 and a reverse trigger switch 47 are fixedly installed on opposite sides of the two sliding plates 44, respectively. One end of the transmission shaft 39 penetrates into the feedback circular shell 41 and is coaxial with the center of the feedback circular shell 41. The shaft wall of one end of the transmission shaft 39 located in the feedback circular shell 41 is fixedly connected with a pressing plate 48 arranged between the two sliding plates 44.

[0023] The measurement result confirmation mechanism 5 is fixedly installed on the outer wall of the measuring cylinder 1. The measurement result confirmation mechanism 5 includes a confirmation shell 51 installed on the measuring cylinder 1. One side of the inner wall of the confirmation shell 51 is rotatably connected with an adjusting screw rod 52. The outer wall of the confirmation shell 51 is fixedly installed with an adjusting motor 53 for driving the adjusting screw rod 52 to rotate self - sufficiently. The rod wall of the adjusting screw rod 52 is threadedly sleeved with an adjusting seat 54. One side of the adjusting seat 54 is fixedly installed with a U - shaped lifting plate 55. Two pressure switches 56 are installed up and down on the inner wall of the U - shaped lifting plate 55. The outer wall of the confirmation shell 51 is fixedly installed with a thickness value scale plate 57. One side of the adjusting seat 54 is fixedly installed with an identification needle 58. The end of the identification needle 58 far from the adjusting seat 54 passes through a strip - shaped opening opened on the side wall of the confirmation shell 51 and extends out of the confirmation shell 51, and is arranged on one side of the thickness value scale plate 57. The inner wall of the confirmation shell 51 is fixedly installed with multiple guide slide rods 59 arranged side by side. The same force - receiving plate 510 is slidably sleeved outside the multiple guide slide rods 59. The upper end of the force - receiving plate 510 and the top of the inner wall of the confirmation shell 51 are fixedly installed with multiple holding springs 511 sleeved outside the guide slide rods 59. The lower end of the force - receiving plate 510 is fixedly installed with a feedback permanent magnet plate 512. The inner wall bottom of the confirmation shell 51 is fixedly installed with a feedback electromagnetic plate 513 arranged opposite to the feedback permanent magnet plate 512. The force - receiving plate 510 is arranged between the two pressure switches 56. The U - shaped lifting plate 55 and the two pressure switches 56 are connected by an error tolerance adjustment mechanism 8.

[0024] The error tolerance adjustment mechanism 8 includes multiple fixed slide rods 81 fixedly installed on the inner side of the U - shaped lifting plate 55. Two moving plates 82 are symmetrically slidably connected up and down outside the multiple fixed slide rods 81. The pressure switch 56 is fixedly installed on the side wall of the moving plate 82. Multiple connecting springs 83 sleeved outside the fixed slide rods 81 are fixedly connected between the moving plate 82 and the opposite side of the U - shaped lifting plate 55. One side of the moving plate 82 far from the pressure switch 56 is fixedly installed with an adjusting permanent magnet plate 84. The inner wall of the U - shaped lifting plate 55 is fixedly installed with an adjusting electromagnetic plate 85 arranged opposite to the adjusting permanent magnet plate 84.

[0025] The steel bar diameter synchronous feedback mechanism 6 is installed on the positioning and clamping mechanism 2 and is electrically connected to the measurement result confirmation mechanism 5. The steel bar diameter synchronous feedback mechanism 6 includes an insulating cylinder 61 fixedly installed on the upper end of the U - shaped positioning plate 21. One side of the inner wall of the insulating cylinder 61 is fixedly installed with a feedback resistance rod 62. The upper end of the extrusion plate 23 is fixedly installed with a synchronous rod 63. The upper end of the synchronous rod 63 penetrates into the insulating cylinder 61. The rod wall of the upper end of the synchronous rod 63 is fixedly connected with a feedback conductive contact piece 64 in electrical contact with the feedback resistance rod 62.

[0026] The operating principle of the present invention is described as follows: After the steel bar project is completed and the reinforced concrete formwork is placed in place, first, the U-shaped positioning plate 21 is sleeved on one of the outer steel bars of the steel bar skeleton. The PLC controller controls the electric push rod 22 to act. The electric push rod 22 pushes the extrusion plate 23 to move. The clamping force between the U-shaped positioning plate 21 and the extrusion plate 23 makes the entire measuring device firmly connected to the steel bar. When the PLC controller monitors that the output torque of the electric push rod 22 reaches the threshold value, the PLC controller controls the electric push rod 22 to stop acting, and confirms that the positioning and fixing mechanism 2 is firmly connected to the steel bar; The PLC controller then controls the power supply device to supply power to the suction electromagnetic plate 77. The suction electromagnetic plate 77 is energized to generate a magnetic force opposite to that of the suction permanent magnet plate 76, thereby providing an attractive force to the push-pull plate 73 and the triangular blocking block 75. As a result, the push-pull plate 73 overcomes the elastic force of the return spring 74 along the limit slide rod 72 and drives the triangular blocking block 75 to be received into the extension shell 71, thereby releasing the limit of the triangular blocking block 75 on the measuring block 32. The measuring block 32 drives the measuring rod 31 and the contact plate 37 to move under the action of the pulling spring 33 until the contact plate 37 contacts the reinforced concrete formwork. When there is an angular deviation of the reinforced concrete formwork relative to the measuring cylinder 1, at this time, the contact plate 37 contacts the reinforced concrete formwork, but there will be a deflection angle difference from the transmission shaft 39 and the mounting cylinder 36. As a result, the transmission shaft 39 drives the pressing plate 48 to generate an angular offset in the feedback circular shell 41, so that the pressing plate 48 presses on the forward trigger switch 46 or the reverse trigger switch 47. The forward trigger switch 46 and the reverse trigger switch 47 control the deflection motor 24 to perform forward drive or reverse drive, thereby adjusting the relative deflection angle of the measuring cylinder 1 to make the measuring cylinder 1 perpendicular to the reinforced concrete formwork until the pressing plate 48 no longer presses and contacts the forward trigger switch 46 or the reverse trigger switch 47. At this time, the PLC controller controls the deflection motor 24 to stop acting, and confirms the final measuring position of the measuring cylinder 1. At this time, the PLC controller controls the infrared emitter 35 and the infrared receiver 34 to work. The infrared emitter 35 emits infrared light that is received by the infrared receiver 34. By calculating the time when the infrared receiver 34 receives the infrared light, the relative moving distance of the measuring block 32 is determined, which represents the measured thickness of the steel bar protection layer; The PLC controller controls the power supply device to supply power to the feedback electromagnetic plate 513 based on the thickness signal fed back by the infrared emitter 35 and the infrared receiver 34. Specifically, the greater the measured thickness, the greater the current that the PLC controller controls the power supply device to supply to the feedback electromagnetic plate 513. After the feedback electromagnetic plate 513 is energized, it generates the same magnetic force as the feedback permanent magnet plate 512, thereby giving a magnetic thrust to the force-receiving plate 510, causing the force-receiving plate 510 to move upward a greater distance along the guiding slide rod 59 against the elastic force of the holding spring 511. And based on the requirement of the initial set thickness of the steel bar protection layer, the regulating motor 53 is controlled to operate. The regulating motor 53 drives the regulating screw rod 52 to rotate self-drivenly. Through the threaded socket connection between the regulating screw rod 52 and the regulating seat 54, the regulating seat 54 drives the U-shaped lifting plate 55 to move up and down to a suitable height position. The relative position of the U-shaped lifting plate 55 and the two pressure switches 56 therein is determined by the relative indication of the marking needle 58 and the thickness value scale plate 57. When the measurement result of the steel bar protection layer thickness is within the allowable range, at this time, the magnetic thrust generated by the cooperation of the feedback electromagnetic plate 513 and the feedback permanent magnet plate 512 will make the force-receiving plate 510 at a suitable height, that is, the force-receiving plate 510 is located within the U-shaped lifting plate 55 but does not press and contact the upper and lower pressure switches 56, indicating that the measurement result is qualified. And when the measured thickness is too large or too small, it will cause the force-receiving plate 510 to press on the upper or lower pressure switch 56, indicating that the measurement result of the current position of the steel bar protection layer thickness is unqualified; And when the positioning and clamping mechanism 2 is initially used to be connected and fixed to the steel bar, during the downward movement of the pressing plate 23, the synchronous rod 63 will be driven to move synchronously. The synchronous rod 63 drives the feedback conductive contact piece 64 to slide on the feedback resistance rod 62. Specifically, the larger the diameter of the steel bar, the shorter the distance that the pressing plate 23 needs to move downward, and then the smaller the distance that the feedback conductive contact piece 64 slides on the feedback resistance rod 62, making the access resistance value of the feedback resistance rod 62 relatively smaller. And the feedback conductive contact piece 64 and the feedback resistance rod 62 are connected in series in the power supply circuit of the regulating electromagnetic plate 85. And after the regulating electromagnetic plate 85 is energized, it generates the same magnetic force as the regulating permanent magnet plate 84, thereby driving the moving plate 82 to move relatively along the fixed slide rod 81 against the elastic force of the connecting spring 83. When the larger diameter of the steel bar makes the access resistance value of the feedback resistance rod 62 relatively smaller, at this time, the supply current of the regulating electromagnetic plate 85 is larger, making the moving distance of the moving plate 82 larger, and then making the interval distance between the two pressure switches 56 smaller, indicating that the allowable error value of the measurement thickness result is smaller. Because the larger the diameter of the steel bar, the higher the importance of the component where it is located, and the allowable error needs to be more strictly controlled. The cross-sectional area of the large-diameter steel bar is large and the risk of stress concentration is high. The specification ensures that the protection layer thickness can provide sufficient anchorage and durability reserve by reducing the allowable error (that is, more strictly controlling the negative deviation).

[0027] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A device for measuring the thickness of the steel bar protective layer, comprising a measuring cylinder (1), characterized in that, Also includes: A positioning and fixing mechanism (2) is fixedly mounted on one side of the bottom of the measuring tube (1) and is used to fix the entire device to the steel bar; An automatic thickness measuring mechanism (3) is arranged inside the measuring cylinder (1); A verticality detection feedback mechanism (4) is mounted on the moving end of the automatic thickness measurement mechanism (3), and the verticality detection feedback mechanism (4) controls the action of the positioning and fixing mechanism (2); A measurement result confirmation mechanism (5) is fixedly mounted on the outer wall of the measuring cylinder (1); The steel bar diameter synchronous feedback mechanism (6) is mounted on the positioning and fixing mechanism (2) and is electrically connected to the measurement result confirmation mechanism (5).

2. The steel bar cover thickness measuring device according to claim 1, characterized in that, The positioning and clamping mechanism (2) comprises a U-shaped positioning plate (21), the upper end of the U-shaped positioning plate (21) is symmetrically fixed with two electric push rods (22), the lower movable ends of the two electric push rods (22) are fixedly connected to the same extrusion plate (23), the lower end of the extrusion plate (23) and the inner bottom of the U-shaped positioning plate (21) are both fixedly mounted with anti-slip rubber pads, a deflection motor (24) is fixedly mounted on one side of the U-shaped positioning plate (21), and the output end of the deflection motor (24) is fixedly connected to one side of the lower end of the measuring cylinder (1).

3. The steel bar cover thickness measuring device according to claim 1, characterized in that, The automatic thickness measuring mechanism (3) comprises a measuring rod (31) movably inserted into the bottom of the measuring tube (1); a measuring block (32) is fixedly connected to the upper end of the measuring rod (31); a pulling spring (33) sleeved on the outside of the measuring rod (31) is fixedly mounted at the lower end of the measuring block (32) and the bottom of the inner wall of the measuring tube (1); an infrared receiver (34) is fixedly mounted on the top of the measuring block (32); an infrared transmitter (35) is fixedly inserted into the top of the measuring tube (1); the lower end of the measuring rod (31) passes through the lower end of the measuring tube (1) and is fixedly connected to a mounting cylinder (36); a contact plate (36) is provided on the lower side of the mounting cylinder (36) 37), the upper end of the abutment plate (37) is fixedly connected to two side plates (38) symmetrically arranged about the mounting cylinder (36), the two side plates (38) and the mounting cylinder (36) are rotationally connected via a transmission shaft (39), a torsion return spring (310) sleeved outside the transmission shaft (39) is fixedly installed on the opposite side of the side plate (38) and the mounting cylinder (36), the verticality detection feedback mechanism (4) is fixedly installed on the outer wall of one of the side plates (38) and is transmission-connected to the transmission shaft (39), and two groups of limit locking mechanisms (7) for limiting the position of the measuring block (32) are symmetrically installed on the top side wall of the measuring cylinder (1).

4. A device for measuring the thickness of the steel bar protective layer according to claim 3, characterized in that, The verticality detection feedback mechanism (4) includes a feedback circular shell (41). On the upper side of the inner wall of the feedback circular shell (41), two arc-shaped sliding rods (42) are symmetrically and fixedly installed. Both ends of the arc-shaped sliding rod (42) are fixedly connected to a support plate (43) fixedly connected to the inner wall of the feedback circular shell (41). A sliding plate (44) is slidably sleeved outside the arc-shaped sliding rod (42). A compensation spring (45) sleeved outside the arc-shaped sliding rod (42) is fixedly connected between the sliding plate (44) and the support plate (43). On the opposite sides of the two sliding plates (44), a forward trigger switch (46) and a reverse trigger switch (47) are respectively and fixedly installed. One end of the transmission shaft (39) penetrates into the feedback circular shell (41) and is coaxial with the center of the feedback circular shell (41). A pressing plate (48) arranged between the two sliding plates (44) is fixedly connected to the shaft wall at the end of the transmission shaft (39) located inside the feedback circular shell (41).

5. The steel bar cover thickness measuring device according to claim 1, characterized in that The measurement result confirmation mechanism (5) includes a confirmation shell (51). On one side of the inner wall of the confirmation shell (51), an adjustment screw (52) is rotatably connected. An adjustment motor (53) for driving the adjustment screw (52) to rotate is fixedly installed on the outer wall of the confirmation shell (51). An adjustment seat (54) is threadedly sleeved on the rod wall of the adjustment screw (52). A U-shaped lifting plate (55) is fixedly installed on one side of the adjustment seat (54). Two pressure switches (56) are installed up and down on the inner wall of the U-shaped lifting plate (55). A thickness value scale plate (57) is fixedly installed on the outer wall of the confirmation shell (51). A marking needle (58) is fixedly installed on one side of the adjustment seat (54). The end of the marking needle (58) far from the adjustment seat (54) penetrates through a strip-shaped opening opened on the side wall of the confirmation shell (51) and extends out of the confirmation shell (51), and is arranged on one side of the thickness value scale plate (57). A plurality of guide sliding rods (59) arranged side by side are fixedly installed on the inner wall of the confirmation shell (51). The same stress plate (510) is slidably sleeved outside the plurality of guide sliding rods (59). A plurality of holding springs (511) sleeved outside the guide sliding rods (59) are fixedly installed between the upper end of the stress plate (510) and the top of the inner wall of the confirmation shell (51). A feedback permanent magnet plate (512) is fixedly installed at the lower end of the stress plate (510). A feedback electromagnetic plate (513) opposite to the feedback permanent magnet plate (512) is fixedly installed at the bottom of the inner wall of the confirmation shell (51). The stress plate (510) is arranged between the two pressure switches (56). The U-shaped lifting plate (55) and the two pressure switches (56) are connected through an error tolerance adjustment mechanism (8).

6. The steel bar cover thickness measuring device according to claim 2, characterized in that, The steel bar diameter synchronous feedback mechanism (6) includes an insulating cylinder (61) fixedly installed at the upper end of the U-shaped positioning plate (21). On one side of the inner wall of the insulating cylinder (61), a feedback resistance rod (62) is fixedly installed. At the upper end of the extrusion plate (23), a synchronous rod (63) is fixedly installed. The upper end of the synchronous rod (63) penetrates into the insulating cylinder (61). A feedback conductive contact piece (64) that is in electrical contact with the feedback resistance rod (62) is fixedly connected to the upper end rod wall of the synchronous rod (63).

7. The steel bar cover thickness measuring device according to claim 3, characterized in that, The limit locking mechanism (7) includes an extension shell (71) fixedly installed on the outer wall of the measuring cylinder (1). A plurality of limit sliding rods (72) arranged side by side are fixedly installed on the inner wall of the extension shell (71). The same push-pull plate (73) is slidably sleeved outside the plurality of limit sliding rods (72). A plurality of return springs (74) sleeved outside the limit sliding rods (72) are fixedly connected between the push-pull plate (73) and the opposite side of the extension shell (71). A triangular blocking block (75) is fixedly installed on the side wall of the push-pull plate (73). A through hole for the triangular blocking block (75) to penetrate into is formed in the side wall of the measuring cylinder (1). The triangular blocking block (75) abuts against the lower end of the measuring block (32). A suction permanent magnet plate (76) is fixedly installed on the side of the push-pull plate (73) away from the triangular blocking block (75). A suction electromagnetic plate (77) opposite to the suction permanent magnet plate (76) is fixedly installed on the rear side of the inner wall of the extension shell (71).

8. The steel bar cover thickness measuring device according to claim 5, characterized in that, The error tolerance adjustment mechanism (8) includes a plurality of fixed sliding rods (81) fixedly installed inside the U-shaped lifting plate (55). Two moving plates (82) are symmetrically slidably connected up and down outside the plurality of fixed sliding rods (81). The pressure switch (56) is fixedly installed on the side wall of the moving plate (82). A plurality of connecting springs (83) sleeved outside the fixed sliding rods (81) are fixedly connected between the moving plate (82) and the opposite side of the U-shaped lifting plate (55). An adjustment permanent magnet plate (84) is fixedly installed on the side of the moving plate (82) away from the pressure switch (56). An adjustment electromagnetic plate (85) opposite to the adjustment permanent magnet plate (84) is fixedly installed on the inner wall of the U-shaped lifting plate (55).

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