A device for detecting thickness of protective layer of steel bars in concrete structure

Abstract

The present invention relates to the technical field of thickness detection, and in particular, to a device for detecting the thickness of a protective layer of steel bars in a concrete structure. The device comprises a thickness detector body, a frame in a "U" shape, and a detector carrier slidably arranged on one side of the frame toward the bottom of the beam body; the frame is also provided with a driving mechanism for driving the detector carrier to move along the width direction of the beam body on the side facing the bottom of the beam body, and the driving mechanism has an energy storage state and an energy release state; in the device for detecting the thickness of a protective layer of steel bars in a concrete structure, in a single movement process, the power generated by the movement of the frame is stored by a coil spring, and when it is necessary to detect adjacent steel bars, the position of the gripping rod is manually controlled by a staff member, so that the stored power acts on the detector carrier, and the card box is driven to move along the width direction of the beam body by the detector carrier, thereby realizing the detection of multiple steel bars arranged in parallel.

Description

Technical Field

[0001] The invention relates to the technical field of thickness detection, in particular to a device for detecting the thickness of a protective layer of a steel bar in a concrete structure. Background Art

[0002] The steel bar protective layer is the concrete used to protect the steel bars from the outer edge of the steel bars to the surface of the structural member. The thicker the concrete protective layer, the better the bonding and anchoring performance, durability and fire resistance of the member's stress-bearing steel bars. However, too large a protective layer thickness will cause the width of the cracks generated after the member is stressed to be too large, which will affect its performance and cause economic waste. Therefore, the control of the thickness of the steel bar protective layer is of great significance to ensure the performance of the member.

[0003] When testing the thickness of the steel bar protective layer in concrete structures, the electromagnetic induction method is usually used to test the thickness of the steel bar protective layer in concrete structures. During the testing process, workers usually hold a steel bar protective layer thickness detector and stand at a height to test the thickness of the steel bar protective layer. The labor intensity is high, and there is a certain degree of danger in high-altitude construction. Since the workers' arms are raised for a long time, it is difficult to ensure the stability of the steel bar protective layer thickness detector during the mobile testing process.

[0004] In order to improve the stability during the detection process, when detecting the top beam, the relevant technology will set a "U"-shaped bracket, which slides on the top beam, and fix the thickness detector on the bracket. The bracket slides on the bottom of the top beam to realize the detection of the top beam. However, the current thickness detectors are basically fixed on the bracket, which makes it difficult for the thickness detector to move on the bracket, resulting in difficulty in detecting multiple parallel steel bars during a single movement of the bracket. Summary of the invention

[0005] The purpose of the present invention is to provide a device for detecting the thickness of the protective layer of steel bars in a concrete structure, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, a device for detecting the thickness of the protective layer of steel bars in a concrete structure is provided, comprising a thickness detector body, a frame in a "U" shape, and a detector carrier slidably arranged on the side of the frame facing the bottom of the beam body; a driving mechanism for driving the detector carrier to move along the width direction of the beam body is also arranged on the side of the frame facing the bottom of the beam body, and the driving mechanism has an energy storage state and an energy release state;

[0007] In the energy storage state, the driving mechanism utilizes the movement of the frame at the bottom of the beam body to store energy; in the energy release state, the driving mechanism utilizes the stored power to drive the detector carrier to move along the width direction of the beam body;

[0008] A grip rod is provided on one side of the frame that slides relative to the detector carrier and is used to drive the frame to move, and the sliding direction of the grip rod is consistent with the length direction of the beam body; the grip rod controls the driving mechanism to switch between the energy storage state and the energy release state according to its own sliding position.

[0009] As a further improvement of the technical solution, the driving mechanism includes a driven wheel, a reciprocating screw rod coaxially connected to the driven wheel, and a coil spring arranged between the driven wheel and the reciprocating screw rod;

[0010] When the coil spring is compressed, the drive mechanism is in an energy storage state; when the coil spring is elastically reset, the drive mechanism is in an energy release state.

[0011] As a further improvement of the technical solution, the interior of the frame is a hollow structure; the driven wheels are located at both ends of the frame, and the two ends of the reciprocating screw rod are rotatably connected to side plates fixedly arranged inside the frame, and a through opening is opened on one side of the frame facing the bottom of the beam body, and one side of the driven wheel passes through the through opening and protrudes from the side wall of the frame;

[0012] The interior of the driven wheel is a hollow structure, the end of the reciprocating screw is rotated to penetrate the driven wheel, the inner ring of the coil spring is connected to the outer ring of the reciprocating screw, and the outer ring is connected to the inner ring of the driven wheel.

[0013] As a further improvement of the present technical solution, the detector carrier includes a card box for loading the thickness detector body, and a nut fixedly arranged on the side of the card box close to the reciprocating screw, and the nut is threadedly connected to the reciprocating screw; the side wall of the frame close to the nut is provided with a slideway whose direction is consistent with the axial direction of the reciprocating screw, and the nut is slidably arranged in the slideway.

[0014] As a further improvement of the technical solution, a limit assembly is further provided inside the frame, and the limit assembly controls the reciprocating screw rod to rotate or stop rotating according to the sliding state of the grip rod;

[0015] The limiting assembly includes an outer toothed ring fixedly mounted on both ends of the outer ring of the reciprocating screw, and a connecting rod located between the reciprocating screw and the gripping rod. The connecting rod is located inside the frame, and both ends of the connecting rod protrude toward the connecting rod to form an insertion rod that can be inserted into the groove of the outer ring of the outer toothed ring; a round rod that slides through the side wall of the frame is fixedly arranged on the side of the connecting rod away from the insertion rod, and a reset spring that elastically connects the connecting rod and the inner wall of the frame is arranged between the connecting rod and the inner wall of the frame.

[0016] As a further improvement of the technical solution, a slide groove is provided on the side of the frame body facing the grip rod, and a slider whose sliding direction is consistent with the length direction of the beam body is provided in the slide groove;

[0017] One side of the slider is fixedly connected to one end of the grip rod, and the other side is provided with a bevel with a wide bottom and a narrow top; when the slider moves upward, the slider drives the connecting rod to move toward the outer gear ring through the bevel, so that the insertion rod is inserted into the groove of the outer ring of the outer gear ring.

[0018] As a further improvement of the technical solution, the inner ring of the driven wheel is provided with a plurality of slots; the inner ring of the coil spring is fixedly connected to the outer ring of the reciprocating screw, and the outer ring is fixedly provided with protrusions that snap into the slots.

[0019] As a further improvement of the present technical solution, the frame body includes a straight rod and a bent rod located at both ends of the straight rod, the ends of the bent rod are plugged into the ends of the straight rod, and the outer circle of the bent rod is threadedly connected with bolts; a fixed shaft is fixedly arranged on the side wall of the bent rod facing the straight rod, and a rotating wheel is rotatably arranged on the outer circle of the fixed shaft.

[0020] As a further improvement of the technical solution, the friction force between the rotating wheel and the fixed shaft is greater than the friction force of the sliding block sliding in the sliding groove.

[0021] As a further improvement of the present technical solution, a scale is provided on the side of the frame body close to the grip rod; both ends of the slide groove extend toward the bent ends of the frame body, and a sliding frame that moves along the length direction of the beam body is provided in the slide groove; the slider is slidably arranged inside the sliding frame, and the sliding direction is consistent with the width direction of the beam body; a stop rod is provided on the side of the slider close to the nut, which is located on the moving path of the nut when the grip rod moves downward.

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

[0023] 1. In the concrete structure steel bar protective layer thickness detection device, during a single movement, the power generated by the frame movement is stored through a coil spring. When it is necessary to detect adjacent steel bars, the staff manually controls the position of the grip to make the stored power act on the detector carrier, and the detector carrier drives the card box to move along the width direction of the beam, thereby realizing the detection of multiple steel bars arranged in parallel.

[0024] 2. In the concrete structure steel bar protective layer thickness detection device, when the reciprocating screw drives the thickness detector body to move, the staff can quickly limit the moving position of the thickness detector body by holding the rod, so as to facilitate the thickness detector body to complete the movement under the control of the staff, so as to improve the accuracy of the detection process. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The overall structure of the present invention is shown in FIG. Figure 1 ;

[0026] Figure 2The overall structure of the present invention is shown in FIG. Figure 2 ;

[0027] Figure 3 The overall structure of the present invention is shown in FIG. Figure 3 ;

[0028] Figure 4 It is a schematic diagram of the cross-sectional structure of the frame of the present invention;

[0029] Figure 5 It is a structural schematic diagram of the frame of the present invention;

[0030] Figure 6 It is a structural schematic diagram of the driving mechanism of the present invention;

[0031] Figure 7 It is a schematic structural diagram of the coil spring of the present invention;

[0032] Figure 8 For the present invention Figure 6 A schematic diagram of the structure at A;

[0033] Fig. 9 It is a structural schematic diagram of the hypotenuse of the present invention;

[0034] Fig.10 It is a structural schematic diagram of the reciprocating screw rod of the present invention;

[0035] Fig.11 For the present invention Fig.11 A schematic diagram of the structure at B;

[0036] Fig.12 It is a structural schematic diagram of the sliding frame of the present invention;

[0037] Fig.13 It is a schematic diagram of the position state of the baffle rod of the present invention.

[0038] The meaning of each number in the figure is:

[0039] 100, frame; 101, rotating wheel; 102, fixed axis; 103, straight rod; 104, bent rod; 105, bolt;

[0040] 110, thickness detector body; 120, detector carrier; 121, card box; 122, nut;

[0041] 130, grip; 131, slider; 132, slide groove; 133, bevel edge; 134, slide frame; 135, stop rod;

[0042] 140. Driving mechanism; 141. Driven wheel; 142. Reciprocating screw; 143. Side plate; 144. Coil spring; 145. Protrusion; 146. Slot; 150. External gear ring; 151. Connecting rod; 152. Insert rod; 153. Round rod; 154. Return spring; 200. Beam body. DETAILED DESCRIPTION

[0043] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0045] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0046] See also Figure 1 and Figure 2As shown, a device for detecting the thickness of the protective layer of steel bars in a concrete structure is provided, comprising a thickness detector body 110, a frame body 100 in a "U"-shaped state, and a detector carrier 120 slidably arranged on one side of the frame body 100 facing the bottom of the beam body 200; a driving mechanism 140 for driving the detector carrier 120 to move along the width direction of the beam body 200 is also arranged on the side of the frame body 100 facing the bottom of the beam body 200, and the driving mechanism 140 has an energy storage state and an energy release state. In the energy storage state, the driving mechanism 140 uses the frame body 100 to drive the detector carrier 120 to move along the width direction of the beam body 200. The frame 100 moves at the bottom of the beam body 200 to store energy; in the energy release state, the driving mechanism 140 uses the stored power to drive the detector carrier 120 to move along the width direction of the beam body 200; the frame 100 is slidably provided with a handle 130 on one side relative to the detector carrier 120 for driving the frame 100 to move, and the sliding direction of the handle 130 is consistent with the length direction of the beam body 200. At the same time, the handle 130 controls the driving mechanism 140 to switch between the energy storage state and the energy release state according to its own sliding position.

[0047] That is to say, during a single movement, the power generated by the movement of the frame 100 is stored through the coil spring 144. When it is necessary to detect adjacent steel bars, the staff manually controls the position of the handle 130 to make the stored power act on the detector carrier 120. The detector carrier 120 drives the card box 121 to move along the width direction of the beam body 200, thereby realizing the detection of multiple steel bars arranged in parallel.

[0048] Among them, Figure 4 As shown, the driving mechanism 140 includes a driven wheel 141, a reciprocating screw rod 142 coaxially connected to the driven wheel 141, and a coil spring 144 (as shown in FIG. Figure 7 As shown); when the coil spring 144 is compressed, the drive mechanism 140 is in an energy storage state; when the coil spring 144 is elastically reset, the drive mechanism 140 is in an energy release state.

[0049] Specifically, in Figure 6 In the figure, the interior of the frame 100 is a hollow structure; the driven wheel 141 is located at both ends of the interior of the frame 100, and the two ends of the reciprocating screw 142 are rotatably connected to the side plates 143 fixedly set inside the frame 100, and a through opening is opened on the side of the frame 100 facing the bottom of the beam body 200, and one side of the driven wheel 141 passes through the through opening and protrudes from the side wall of the frame 100; the interior of the driven wheel 141 is a hollow structure, and the end of the reciprocating screw 142 rotates and penetrates the driven wheel 141, the inner circle of the coil spring 144 is connected to the outer circle of the reciprocating screw 142, and the outer circle is connected to the inner circle of the driven wheel 141.

[0050] like Figure 6As shown, the detector carrier 120 includes a card box 121 for loading the thickness detector body 110, and a nut 122 fixedly arranged on a side of the card box 121 close to the reciprocating screw rod 142, the nut 122 is threadedly connected to the reciprocating screw rod 142, and a slideway is provided on the side wall of the frame 100 close to the nut 122 in a direction consistent with the axial direction of the reciprocating screw rod 142 (refer to Figure 2 ), the nut 122 is slidably arranged in the slideway. In this way, the slideway can limit the nut 122 to prevent the nut 122 from rotating. When the reciprocating screw 142 rotates, the reciprocating screw 142 can drive the cartridge 121 to reciprocate along the axial direction of the reciprocating screw 142 through the nut 122.

[0051] In addition, a limit assembly is also provided inside the frame 100, and the limit assembly controls the reciprocating screw rod 142 to rotate or stop rotating according to the sliding state of the grip rod 130. Figure 6 ,as well as Figure 8-Figure 11 As shown: the limiting assembly includes an outer toothed ring 150 fixedly mounted on both ends of the outer ring of the reciprocating screw 142, and a connecting rod 151 located between the reciprocating screw 142 and the gripping rod 130, the connecting rod 151 is located inside the frame 100, both ends of the connecting rod 151 protrude toward the outer toothed ring 150, and form an insertion rod 152 that can be inserted into the outer ring groove of the outer toothed ring 150; a round rod 153 that slides through the side wall of the frame 100 is fixedly arranged on the side of the connecting rod 151 away from the insertion rod 152, and a reset spring 154 that elastically connects the connecting rod 151 and the inner wall of the frame 100 is arranged between the two.

[0052] like Figure 3 and Fig. 9 As shown, in some embodiments, a slide groove 132 is provided on one side of the frame body 100 facing the grip rod 130, and a slider 131 is provided in the slide groove 132, the sliding direction of which is consistent with the length direction of the beam body 200, one side of the slider 131 is fixedly connected to one end of the grip rod 130, and the other side is provided with a bevel 133 with a wide bottom and a narrow top; when the slider 131 moves upward, the slider 131 drives the connecting rod 151 to move toward the outer gear ring 150 through the bevel 133, so that the insertion rod 152 is inserted into the groove of the outer ring of the outer gear ring 150. In addition, the grip rod 130 is preferably a telescopic structure, and the telescopic grip rod 130 can adjust its own length arbitrarily, so as to facilitate adaptation to beam bodies 200 of different heights and improve the use scenario.

[0053] Working principle:

[0054] Combination Figure 1 As shown, the frame 100 is first placed upward, and then inserted into the bottom of the beam 200 , at which time the bent portions at both ends of the frame 100 fit with the side walls of the beam 200 , and the driven wheel 141 fits with the bottom of the beam 200 .

[0055] Then, the gripping rod 130 is pushed toward the thickness detector body 110. At this time, the gripping rod 130 first drives the slider 131 to slide to the top of the slide groove 132. During the sliding process, the slider 131 drives the connecting rod 151 to move toward the outer gear ring 150 through the bevel 133, so that the insertion rod 152 is inserted into the groove of the outer ring of the outer gear ring 150. At this time, the outer gear ring 150 cannot rotate, and the reciprocating screw rod 142 fixedly connected to the outer gear ring 150 cannot rotate. When the slider 131 moves to the top of the slide groove 132, since the slider 131 cannot continue to move in the slide groove 132, the gripping rod 130 is continued to be pushed. The gripping rod 130 drives the frame 100 to move through the slider 131, and the frame 100 drives the driven wheel 141 and the thickness detector body 110 to move along the length direction of the beam body 200. During the movement of the driven wheel 141, the friction between the driven wheel 141 and the bottom of the beam 200 forces the driven wheel 141 to rotate. The rotational force of the driven wheel 141 is applied to the reciprocating screw 142 through the coil spring 144. However, since the reciprocating screw 142 cannot rotate, the coil spring 144 can only be compressed to store energy. During the movement of the thickness detector body 110 along the length direction of the beam 200, the detection of different positions of a single steel bar is realized.

[0056] When parallel steel bars need to be inspected, the driving of the gripping rod 130 is stopped, and the gripping rod 130 is slid toward the bottom of the slide slot 132. At this time, the gripping rod 130 drives the slider 131 to slide to the bottom of the slide slot 132. During this process, the bevel 133 on one side of the slider 131 moves downward to disengage from the connecting rod 151. The connecting rod 151 is reset by the reset spring 154 to drive the insertion rod 152 to disengage from the outer gear ring 150, thereby stopping the restriction on the outer gear ring 150. At this time, the compressed coil spring 144 can drive the reciprocating screw 142 to rotate. The reciprocating screw 142 rotates and drives the card box 121 to move through the nut 122. The card box 121 drives the thickness detector body 110 to move along the width direction of the beam body 200. When it moves to the appropriate position, the slider 131 is driven by the grip 130 to slide to the top of the slide groove 132, so that the insertion rod 152 restricts the outer gear ring 150 again. At this time, the reciprocating screw 142 stops rotating again, and the thickness detector body 110 is fixed, thereby realizing the detection of the parallel arranged steel bars.

[0057] It is worth noting that there is friction between the side wall of the bent end of the frame 100 and the beam 200, so the slider 131 cannot drive the frame 100 to move during the sliding process in the slide slot 132. Only when the slider 131 is at the end of the slide slot 132, the frame 100 will be driven to move if the slider 131 continues to apply a moving force.

[0058] Moreover, when testing the longer beam 200, the driven wheel 141 needs to rotate continuously, which may cause the coil spring 144 to be over-compressed. Figure 7 As shown: the inner ring of the driven wheel 141 is provided with a plurality of slots 146; the inner ring of the coil spring 144 is fixedly connected to the outer ring of the reciprocating screw 142, and the outer ring is fixedly provided with a protrusion 145 that is inserted into the slot 146. When the coil spring 144 is over-compressed, the anti-deformation force of the coil spring 144 is greater than the friction between the protrusion 145 and the slot 146, so that the protrusion 145 is separated from the slot 146 and enters the next slot 146. When the protrusion 145 enters the next slot 146 from the previous slot 146, the coil spring 144 releases part of the energy, thereby avoiding the phenomenon of excessive compression.

[0059] In addition, in order to facilitate the movement of the frame 100 at the beam 200, as shown in FIG. Figure 4 and Figure 5 As shown: the frame 100 includes a straight rod 103 and a bent rod 104 located at both ends of the straight rod 103, the ends of the bent rod 104 are plugged into the ends of the straight rod 103, and the outer circle of the bent rod 104 is threadedly connected with a bolt 105; the bent rod 104 is fixedly provided with a fixed shaft 102 on the side wall facing the straight rod 103, and the outer circle of the fixed shaft 102 is rotatably provided with a rotating wheel 101. In this way, during testing, first pull the bent rod 104 away from the straight rod 103 so that the distance between the two bent rods 104 is greater than the width of the beam body 200, then place the straight rod 103 at the bottom of the beam body 200, and then push the bent rod 104 toward the side wall of the beam body 200 so that the rotating wheel 101 is in close contact with the side wall of the beam body 200, and then rotate the bolt 105 to fix the bent rod 104 and the straight rod 103 through the bolt 105. At this time, the straight rod 103 and the bent rod 104 can be located on the side wall of the beam body 200 and will not fall off.

[0060] It is worth noting that there is also friction between the rotating wheel 101 and the fixed shaft 102, so the slider 131 cannot drive the frame 100 to move during the sliding process in the sliding groove 132. Only when the slider 131 is at the end of the sliding groove 132, the frame 100 will be driven to move if the slider 131 continues to apply a moving force.

[0061] like Fig.12 and Fig.13As shown, in order to further control the accuracy of the thickness detector body 110 moving along the width direction of the beam body 200. In other embodiments, a scale is provided on the side of the frame 100 close to the grip 130; both ends of the slide slot 132 extend to the bent end of the frame 100, and a sliding frame 134 is provided in the slide slot 132 to move along the length direction of the beam body 200; the slider 131 is slidably provided inside the sliding frame 134, and the sliding direction is consistent with the width direction of the beam body 200; the slider 131 is provided on the side close to the nut 122, and is located on the path of the nut 122 when the grip 130 moves downward.

[0062] Working principle:

[0063] Before testing, the staff can measure the spacing between parallel steel bars in advance and record the data that the grip 130 needs to move on the scale, so that the grip 130 can be moved to the bottom of the steel bar according to the scale. When it is necessary to test the parallel steel bars, stop driving the grip 130, first move the grip 130 to the position corresponding to the scale, and then drive the slider 131 downward through the grip 130, and the slider 131 drives the sliding frame 134 to move downward to the bottom of the slide groove 132 to stop the restriction on the outer gear ring 150. At this time, the compressed coil spring 144 can drive the reciprocating screw 142 to rotate, and the reciprocating screw 142 rotates to drive the card box 121 to move through the nut 122, and the card box 121 drives the thickness detector body 110 to move along the width direction of the beam body 200. When the gripping rod 130 moves down to the bottom of the sliding groove 132 , the blocking rod 135 is located on the moving path of the nut 122 , thereby blocking the blocking rod 135 and causing the nut 122 to stop at the position designated by the staff.

[0064] In summary, when the reciprocating screw 142 drives the thickness detector body 110 to move, the staff can quickly limit the moving position of the thickness detector body 110 through the handle 130, thereby facilitating the movement of the thickness detector body 110 under the control of the staff, so as to improve the accuracy of the detection process.

[0065] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A device for detecting the thickness of a steel bar protective layer of a concrete structure, comprising a thickness detector body (110), a frame (100) in a "U" shape, and a detector carrier (120) slidably arranged on a side of the frame (100) facing the bottom of a beam body (200); characterized in that: A driving mechanism (140) for driving the detector carrier (120) to move along the width direction of the beam body (200) is also provided on one side of the frame body (100) facing the bottom of the beam body (200), the driving mechanism (140) comprising a driven wheel (141), a reciprocating screw rod (142) coaxially rotatably connected to the driven wheel (141), and a coil spring (144) provided between the driven wheel (141) and the reciprocating screw rod (142); When the coil spring (144) is compressed, the driving mechanism (140) is in an energy storage state; when the coil spring (144) is elastically reset, the driving mechanism (140) is in an energy release state; in the energy release state, the driving mechanism (140) uses the stored power to drive the detector carrier (120) to move along the width direction of the beam body (200); A gripping rod (130) for driving the frame (100) to move is slidably disposed on one side of the frame (100) relative to the detector carrier (120), and the sliding direction of the gripping rod (130) is consistent with the length direction of the beam body (200); the gripping rod (130) controls the driving mechanism (140) to switch between an energy storage state and an energy release state according to its own sliding position.

2. The device for detecting the thickness of the protective layer of steel bars in concrete structures according to claim 1 is characterized in that: The interior of the frame (100) is a hollow structure; the driven wheels (141) are located at two ends of the frame (100); the two ends of the reciprocating screw rod (142) are rotatably connected to side plates (143) fixedly arranged inside the frame (100); a through opening is opened on one side of the frame (100) facing the bottom of the beam body (200); one side of the driven wheel (141) passes through the through opening and protrudes from the side wall of the frame (100); The interior of the driven wheel (141) is a hollow structure, the end of the reciprocating screw rod (142) is rotatably arranged to penetrate the driven wheel (141), the inner ring of the coil spring (144) is connected to the outer ring of the reciprocating screw rod (142), and the outer ring of the coil spring (144) is connected to the inner ring of the driven wheel (141).

3. The device for detecting the thickness of the protective layer of steel bars in concrete structures according to claim 2 is characterized in that: The detector carrier (120) comprises a card box (121) for loading the thickness detector body (110), and a nut (122) fixedly arranged on a side of the card box (121) close to the reciprocating screw (142), wherein the nut (122) is threadedly connected to the reciprocating screw (142); a slideway having a direction consistent with the axial direction of the reciprocating screw (142) is provided on a side wall of the frame (100) close to the nut (122), and the nut (122) is slidably arranged in the slideway.

4. The device for detecting the thickness of the protective layer of the steel bar of the concrete structure according to claim 3 is characterized in that: A limit assembly is also provided inside the frame (100), and the limit assembly controls the reciprocating screw rod (142) to rotate or stop rotating according to the sliding state of the grip rod (130); The limit assembly comprises an outer toothed ring (150) fixedly sleeved on both ends of the outer ring of the reciprocating screw (142), and a connecting rod (151) located between the reciprocating screw (142) and the gripping rod (130), wherein the connecting rod (151) is located inside the frame (100), and both ends of the connecting rod (151) protrude toward the outer toothed ring (150) to form an insertion rod (152) that can be inserted into the groove of the outer ring of the outer toothed ring (150); a round rod (153) that slides through the side wall of the frame (100) is fixedly arranged on the side of the connecting rod (151) away from the insertion rod (152), and a return spring (154) that elastically connects the connecting rod (151) and the inner wall of the frame (100) is arranged between the connecting rod (151) and the inner wall of the frame (100).

5. The device for detecting the thickness of the protective layer of the steel bar of the concrete structure according to claim 4 is characterized in that: A sliding groove (132) is provided on one side of the frame body (100) facing the handle (130), and a sliding block (131) is provided in the sliding groove (132), the sliding direction of which is consistent with the length direction of the beam body (200); One side of the slider (131) is fixedly connected to one end of the gripping rod (130), and the other side is provided with a bevel (133) having a wide bottom and a narrow top; when the slider (131) moves upward, the slider (131) drives the connecting rod (151) to move toward the outer gear ring (150) via the bevel (133), so that the insertion rod (152) is inserted into the groove of the outer ring of the outer gear ring (150).

6. The device for detecting the thickness of the protective layer of steel bars in concrete structures according to claim 2 is characterized in that: The inner ring of the driven wheel (141) is provided with a plurality of slots (146); the inner ring of the coil spring (144) is fixedly connected to the outer ring of the reciprocating screw rod (142); and the outer ring of the coil spring (144) is fixedly provided with protrusions (145) that are inserted into the slots (146).

7. The device for detecting the thickness of the protective layer of steel bars in concrete structures according to claim 5 is characterized in that: The frame (100) comprises a straight rod (103) and bent rods (104) located at both ends of the straight rod (103); the ends of the bent rod (104) are plugged into and matched with the ends of the straight rod (103), and the outer ring of the bent rod (104) is threadedly connected with a bolt (105); a fixed shaft (102) is fixedly arranged on the side wall of the bent rod (104) facing the straight rod (103), and a rotating wheel (101) is rotatably arranged on the outer ring of the fixed shaft (102).

8. The device for detecting the thickness of the protective layer of steel bars in concrete structures according to claim 7 is characterized in that: The friction force between the rotating wheel (101) and the fixed shaft (102) is greater than the friction force of the sliding block (131) sliding in the sliding groove (132).

9. The device for detecting the thickness of the protective layer of steel bars in concrete structures according to claim 5 is characterized in that: A scale is provided on one side of the frame body (100) close to the gripping rod (130); both ends of the slide groove (132) extend toward the bent end of the frame body (100), and a sliding frame (134) is provided in the slide groove (132) and moves along the length direction of the beam body (200); the slider (131) is slidably provided inside the sliding frame (134), and the sliding direction is consistent with the width direction of the beam body (200); and a stop rod (135) is provided on one side of the slider (131) close to the nut (122), which is located on the moving path of the nut (122) when the gripping rod (130) moves downward.

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